qwidget.cpp

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** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtGui module of the Qt Toolkit.
**
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#include "qapplication.h"
#include "qapplication_p.h"
#include "qbrush.h"
#include "qcursor.h"
#include "qdesktopwidget.h"
#include "qevent.h"
#include "qhash.h"
#include "qlayout.h"
#include "qmenu.h"
#include "qmetaobject.h"
#include "qpixmap.h"
#include "qpointer.h"
#include "qstack.h"
#include "qstyle.h"
#include "qstylefactory.h"
#include "qvariant.h"
#include "qwidget.h"
#include "qstyleoption.h"
#ifndef QT_NO_ACCESSIBILITY
# include "qaccessible.h"
#endif
#if defined(Q_WS_WIN)
# include "qt_windows.h"
#endif
#ifdef Q_WS_MAC
# include "qt_mac_p.h"
# include "qt_cocoa_helpers_mac_p.h"
# include "qmainwindow.h"
# include "qtoolbar.h"
# include <private/qmainwindowlayout_p.h>
#endif
#if defined(Q_WS_QWS)
# include "qwsdisplay_qws.h"
# include "qwsmanager_qws.h"
# include "qpaintengine.h" // for PorterDuff
# include "private/qwindowsurface_qws_p.h"
#endif
#if defined(Q_WS_QPA)
#include "qplatformwindow_qpa.h"
#endif
#include "qpainter.h"
#include "qtooltip.h"
#include "qwhatsthis.h"
#include "qdebug.h"
#include "private/qstylesheetstyle_p.h"
#include "private/qstyle_p.h"
#include "private/qinputcontext_p.h"
#include "qfileinfo.h"
#include "private/qsoftkeymanager_p.h"

#if defined (Q_WS_WIN)
# include <private/qwininputcontext_p.h>
#endif

#if defined(Q_WS_X11)
# include <private/qpaintengine_x11_p.h>
# include "qx11info_x11.h"
#endif

#include <private/qgraphicseffect_p.h>
#include <private/qwindowsurface_p.h>
#include <private/qbackingstore_p.h>
#ifdef Q_WS_MAC
# include <private/qpaintengine_mac_p.h>
#endif
#include <private/qpaintengine_raster_p.h>

#if defined(Q_OS_SYMBIAN)
#include "private/qt_s60_p.h"
#endif

#include "qwidget_p.h"
#include "qaction_p.h"
#include "qlayout_p.h"
#include "QtGui/qgraphicsproxywidget.h"
#include "QtGui/qgraphicsscene.h"
#include "private/qgraphicsproxywidget_p.h"
#include "QtGui/qabstractscrollarea.h"
#include "private/qabstractscrollarea_p.h"
#include "private/qevent_p.h"

#include "private/qgraphicssystem_p.h"
#include "private/qgesturemanager_p.h"

#ifdef QT_KEYPAD_NAVIGATION
#include "qtabwidget.h" // Needed in inTabWidget()
#endif // QT_KEYPAD_NAVIGATION

#ifdef Q_WS_S60
#include <aknappui.h>
#endif

#ifdef Q_OS_BLACKBERRY
#include <bps/navigator.h>
#endif

#ifdef Q_OS_BLACKBERRY_TABLET
#include <bps/orientation.h>
#endif

// widget/widget data creation count
//#define QWIDGET_EXTRA_DEBUG
//#define ALIEN_DEBUG

QT_BEGIN_NAMESPACE

#if !defined(Q_WS_QWS)
static bool qt_enable_backingstore = true;
#endif
#ifdef Q_WS_X11
// for compatibility with Qt 4.0
Q_GUI_EXPORT void qt_x11_set_global_double_buffer(bool enable)
{
    qt_enable_backingstore = enable;
}
#endif

#if defined(QT_MAC_USE_COCOA)
bool qt_mac_clearDirtyOnWidgetInsideDrawWidget = false;
#endif

static inline bool qRectIntersects(const QRect &r1, const QRect &r2)
{
    return (qMax(r1.left(), r2.left()) <= qMin(r1.right(), r2.right()) &&
            qMax(r1.top(), r2.top()) <= qMin(r1.bottom(), r2.bottom()));
}

static inline bool hasBackingStoreSupport()
{
#ifdef Q_WS_MAC
    return QApplicationPrivate::graphicsSystem() != 0;
#else
    return true;
#endif
}

#ifdef Q_WS_MAC
#  define QT_NO_PAINT_DEBUG
#endif

extern bool qt_sendSpontaneousEvent(QObject*, QEvent*); // qapplication.cpp
extern QDesktopWidget *qt_desktopWidget; // qapplication.cpp

QWidgetBackingStoreTracker::QWidgetBackingStoreTracker()
    :   m_ptr(0)
{

}

QWidgetBackingStoreTracker::~QWidgetBackingStoreTracker()
{
    delete m_ptr;
}

void QWidgetBackingStoreTracker::create(QWidget *widget)
{
    destroy();
    m_ptr = new QWidgetBackingStore(widget);
}

void QWidgetBackingStoreTracker::destroy()
{
    delete m_ptr;
    m_ptr = 0;
    m_widgets.clear();
}

void QWidgetBackingStoreTracker::registerWidget(QWidget *w)
{
    Q_ASSERT(m_ptr);
    Q_ASSERT(w->internalWinId());
    Q_ASSERT(qt_widget_private(w)->maybeBackingStore() == m_ptr);
    m_widgets.insert(w);
}

void QWidgetBackingStoreTracker::unregisterWidget(QWidget *w)
{
    if (m_widgets.remove(w) && m_widgets.isEmpty()) {
        delete m_ptr;
        m_ptr = 0;
    }
}

void QWidgetBackingStoreTracker::unregisterWidgetSubtree(QWidget *widget)
{
    unregisterWidget(widget);
    foreach (QObject *child, widget->children())
        if (QWidget *childWidget = qobject_cast<QWidget *>(child))
            unregisterWidgetSubtree(childWidget);
}

QWidgetPrivate::QWidgetPrivate(int version)
    : QObjectPrivate(version)
      , extra(0)
      , focus_next(0)
      , focus_prev(0)
      , focus_child(0)
      , layout(0)
      , needsFlush(0)
      , redirectDev(0)
      , widgetItem(0)
      , extraPaintEngine(0)
      , polished(0)
      , graphicsEffect(0)
#if !defined(QT_NO_IM)
      , imHints(Qt::ImhNone)
#endif
      , inheritedFontResolveMask(0)
      , inheritedPaletteResolveMask(0)
      , leftmargin(0)
      , topmargin(0)
      , rightmargin(0)
      , bottommargin(0)
      , leftLayoutItemMargin(0)
      , topLayoutItemMargin(0)
      , rightLayoutItemMargin(0)
      , bottomLayoutItemMargin(0)
      , hd(0)
      , size_policy(QSizePolicy::Preferred, QSizePolicy::Preferred)
      , fg_role(QPalette::NoRole)
      , bg_role(QPalette::NoRole)
      , dirtyOpaqueChildren(1)
      , isOpaque(0)
      , inDirtyList(0)
      , isScrolled(0)
      , isMoved(0)
      , isGLWidget(0)
      , usesDoubleBufferedGLContext(0)
#ifndef QT_NO_IM
      , inheritsInputMethodHints(0)
#endif
      , inSetParent(0)
#if defined(Q_WS_X11)
      , picture(0)
#elif defined(Q_WS_WIN)
      , noPaintOnScreen(0)
  #ifndef QT_NO_GESTURES
      , nativeGesturePanEnabled(0)
  #endif
#elif defined(Q_WS_MAC)
      , needWindowChange(0)
      , window_event(0)
      , qd_hd(0)
#elif defined(Q_OS_SYMBIAN)
      , symbianScreenNumber(0)
      , fixNativeOrientationCalled(false)
      , isGLGlobalShareWidget(0)
#endif
{
    if (!qApp) {
        qFatal("QWidget: Must construct a QApplication before a QPaintDevice");
        return;
    }

    if (version != QObjectPrivateVersion)
        qFatal("Cannot mix incompatible Qt libraries");

    isWidget = true;
    memset(high_attributes, 0, sizeof(high_attributes));
#if QT_MAC_USE_COCOA
    drawRectOriginalAdded = false;
    originalDrawMethod = true;
    changeMethods = false;
    isInUnifiedToolbar = false;
    unifiedSurface = 0;
    toolbar_ancestor = 0;
    flushRequested = false;
    touchEventsEnabled = false;
#endif // QT_MAC_USE_COCOA
#ifdef QWIDGET_EXTRA_DEBUG
    static int count = 0;
    qDebug() << "widgets" << ++count;
#endif
}


QWidgetPrivate::~QWidgetPrivate()
{
#ifdef Q_OS_SYMBIAN
    _q_cleanupWinIds();
#endif

    if (widgetItem)
        widgetItem->wid = 0;

    if (extra)
        deleteExtra();

#ifndef QT_NO_GRAPHICSEFFECT
    delete graphicsEffect;
#endif //QT_NO_GRAPHICSEFFECT
}

class QDummyWindowSurface : public QWindowSurface
{
public:
    QDummyWindowSurface(QWidget *window) : QWindowSurface(window) {}
    QPaintDevice *paintDevice() { return window(); }
    void flush(QWidget *, const QRegion &, const QPoint &) {}
};

QWindowSurface *QWidgetPrivate::createDefaultWindowSurface()
{
    Q_Q(QWidget);

    QWindowSurface *surface;
#ifndef QT_NO_PROPERTIES
    if (q->property("_q_DummyWindowSurface").toBool()) {
        surface = new QDummyWindowSurface(q);
    } else
#endif
    {
        if (QApplicationPrivate::graphicsSystem())
            surface = QApplicationPrivate::graphicsSystem()->createWindowSurface(q);
        else
            surface = createDefaultWindowSurface_sys();
    }

    return surface;
}

void QWidgetPrivate::scrollChildren(int dx, int dy)
{
    Q_Q(QWidget);
    if (q->children().size() > 0) {        // scroll children
        QPoint pd(dx, dy);
        QObjectList childObjects = q->children();
        for (int i = 0; i < childObjects.size(); ++i) { // move all children
            QWidget *w = qobject_cast<QWidget*>(childObjects.at(i));
            if (w && !w->isWindow()) {
                QPoint oldp = w->pos();
                QRect  r(w->pos() + pd, w->size());
                w->data->crect = r;
#ifndef Q_WS_QWS
                if (w->testAttribute(Qt::WA_WState_Created))
                    w->d_func()->setWSGeometry();
#endif
                w->d_func()->setDirtyOpaqueRegion();
                QMoveEvent e(r.topLeft(), oldp);
                QApplication::sendEvent(w, &e);
            }
        }
    }
}

#ifndef QT_NO_IM
QInputContext *QWidgetPrivate::assignedInputContext() const
{
    const QWidget *widget = q_func();
    while (widget) {
        if (QInputContext *qic = widget->d_func()->ic)
            return qic;
        widget = widget->parentWidget();
    }
    return 0;
}

QInputContext *QWidgetPrivate::inputContext() const
{
    if (QInputContext *qic = assignedInputContext())
        return qic;
    return qApp->inputContext();
}

QInputContext *QWidget::inputContext()
{
    Q_D(QWidget);
    if (!testAttribute(Qt::WA_InputMethodEnabled))
        return 0;

    return d->inputContext();
}

void QWidget::setInputContext(QInputContext *context)
{
    Q_D(QWidget);
    if (!testAttribute(Qt::WA_InputMethodEnabled))
        return;

    if (context == d->ic)
        return;
    if (d->ic)
        delete d->ic;
    d->ic = context;
    if (d->ic)
        d->ic->setParent(this);
}
#endif // QT_NO_IM

void QWidget::resetInputContext()
{
    if (!hasFocus())
        return;
#ifndef QT_NO_IM
    QInputContext *qic = this->inputContext();
    if(qic)
        qic->reset();
#endif // QT_NO_IM
}

#ifdef QT_KEYPAD_NAVIGATION
QPointer<QWidget> QWidgetPrivate::editingWidget;

bool QWidget::hasEditFocus() const
{
    const QWidget* w = this;
    while (w->d_func()->extra && w->d_func()->extra->focus_proxy)
        w = w->d_func()->extra->focus_proxy;
    return QWidgetPrivate::editingWidget == w;
}

void QWidget::setEditFocus(bool on)
{
    QWidget *f = this;
    while (f->d_func()->extra && f->d_func()->extra->focus_proxy)
        f = f->d_func()->extra->focus_proxy;

    if (QWidgetPrivate::editingWidget && QWidgetPrivate::editingWidget != f)
        QWidgetPrivate::editingWidget->setEditFocus(false);

    if (on && !f->hasFocus())
        f->setFocus();

    if ((!on && !QWidgetPrivate::editingWidget)
        || (on && QWidgetPrivate::editingWidget == f)) {
        return;
    }

    if (!on && QWidgetPrivate::editingWidget == f) {
        QWidgetPrivate::editingWidget = 0;
        QEvent event(QEvent::LeaveEditFocus);
        QApplication::sendEvent(f, &event);
        QApplication::sendEvent(f->style(), &event);
    } else if (on) {
        QWidgetPrivate::editingWidget = f;
        QEvent event(QEvent::EnterEditFocus);
        QApplication::sendEvent(f, &event);
        QApplication::sendEvent(f->style(), &event);
    }
}
#endif

bool QWidget::autoFillBackground() const
{
    Q_D(const QWidget);
    return d->extra && d->extra->autoFillBackground;
}

void QWidget::setAutoFillBackground(bool enabled)
{
    Q_D(QWidget);
    if (!d->extra)
        d->createExtra();
    if (d->extra->autoFillBackground == enabled)
        return;

    d->extra->autoFillBackground = enabled;
    d->updateIsOpaque();
    update();
    d->updateIsOpaque();
}

QWidgetMapper *QWidgetPrivate::mapper = 0;          // widget with wid
QWidgetSet *QWidgetPrivate::allWidgets = 0;         // widgets with no wid


/*****************************************************************************
  QWidget utility functions
 *****************************************************************************/

QRegion qt_dirtyRegion(QWidget *widget)
{
    if (!widget)
        return QRegion();

    QWidgetBackingStore *bs = qt_widget_private(widget)->maybeBackingStore();
    if (!bs)
        return QRegion();

    return bs->dirtyRegion(widget);
}

/*****************************************************************************
  QWidget member functions
 *****************************************************************************/

/*
    Widget state flags:
  \list
  <li> Qt::WA_WState_Created The widget has a valid winId().
  <li> Qt::WA_WState_Visible The widget is currently visible.
  <li> Qt::WA_WState_Hidden The widget is hidden, i.e. it won't
  become visible unless you call show() on it. Qt::WA_WState_Hidden
  implies !Qt::WA_WState_Visible.
  <li> Qt::WA_WState_CompressKeys Compress keyboard events.
  <li> Qt::WA_WState_BlockUpdates Repaints and updates are disabled.
  <li> Qt::WA_WState_InPaintEvent Currently processing a paint event.
  <li> Qt::WA_WState_Reparented The widget has been reparented.
  <li> Qt::WA_WState_ConfigPending A configuration (resize/move) event is pending.
  <li> Qt::WA_WState_DND (Deprecated) The widget supports drag and drop, see setAcceptDrops().
  \endlist
*/

struct QWidgetExceptionCleaner
{
    /* this cleans up when the constructor throws an exception */
    static inline void cleanup(QWidget *that, QWidgetPrivate *d)
    {
#ifdef QT_NO_EXCEPTIONS
        Q_UNUSED(that);
        Q_UNUSED(d);
#else
        QWidgetPrivate::allWidgets->remove(that);
        if (d->focus_next != that) {
            if (d->focus_next)
                d->focus_next->d_func()->focus_prev = d->focus_prev;
            if (d->focus_prev)
                d->focus_prev->d_func()->focus_next = d->focus_next;
        }
#endif
    }
};

QWidget::QWidget(QWidget *parent, Qt::WindowFlags f)
    : QObject(*new QWidgetPrivate, 0), QPaintDevice()
{
    QT_TRY {
        d_func()->init(parent, f);
    } QT_CATCH(...) {
        QWidgetExceptionCleaner::cleanup(this, d_func());
        QT_RETHROW;
    }
}

#ifdef QT3_SUPPORT

QWidget::QWidget(QWidget *parent, const char *name, Qt::WindowFlags f)
    : QObject(*new QWidgetPrivate, 0), QPaintDevice()
{
    QT_TRY {
        d_func()->init(parent , f);
        setObjectName(QString::fromAscii(name));
    } QT_CATCH(...) {
        QWidgetExceptionCleaner::cleanup(this, d_func());
        QT_RETHROW;
    }
}
#endif

QWidget::QWidget(QWidgetPrivate &dd, QWidget* parent, Qt::WindowFlags f)
    : QObject(dd, 0), QPaintDevice()
{
    Q_D(QWidget);
    QT_TRY {
        d->init(parent, f);
    } QT_CATCH(...) {
        QWidgetExceptionCleaner::cleanup(this, d_func());
        QT_RETHROW;
    }
}

int QWidget::devType() const
{
    return QInternal::Widget;
}


//### w is a "this" ptr, passed as a param because QWorkspace needs special logic
void QWidgetPrivate::adjustFlags(Qt::WindowFlags &flags, QWidget *w)
{
    bool customize =  (flags & (Qt::CustomizeWindowHint
            | Qt::FramelessWindowHint
            | Qt::WindowTitleHint
            | Qt::WindowSystemMenuHint
            | Qt::WindowMinimizeButtonHint
            | Qt::WindowMaximizeButtonHint
            | Qt::WindowCloseButtonHint
            | Qt::WindowContextHelpButtonHint));

    uint type = (flags & Qt::WindowType_Mask);

    if ((type == Qt::Widget || type == Qt::SubWindow) && w && !w->parent()) {
        type = Qt::Window;
        flags |= Qt::Window;
    }

    if (flags & Qt::CustomizeWindowHint) {
        // modify window flags to make them consistent.
        // Only enable this on non-Mac platforms. Since the old way of doing this would
        // interpret WindowSystemMenuHint as a close button and we can't change that behavior
        // we can't just add this in.
#ifndef Q_WS_MAC
        if (flags & (Qt::WindowMinMaxButtonsHint | Qt::WindowCloseButtonHint | Qt::WindowContextHelpButtonHint)) {
            flags |= Qt::WindowSystemMenuHint;
#else
        if (flags & (Qt::WindowMinMaxButtonsHint | Qt::WindowCloseButtonHint
                     | Qt::WindowSystemMenuHint)) {
#endif
            flags |= Qt::WindowTitleHint;
            flags &= ~Qt::FramelessWindowHint;
        }
    } else if (customize && !(flags & Qt::FramelessWindowHint)) {
        // if any of the window hints that affect the titlebar are set
        // and the window is supposed to have frame, we add a titlebar
        // and system menu by default.
        flags |= Qt::WindowSystemMenuHint;
        flags |= Qt::WindowTitleHint;
    }
    if (customize)
        ; // don't modify window flags if the user explicitly set them.
    else if (type == Qt::Dialog || type == Qt::Sheet)
#ifndef Q_WS_WINCE
        flags |= Qt::WindowTitleHint | Qt::WindowSystemMenuHint | Qt::WindowContextHelpButtonHint | Qt::WindowCloseButtonHint;
#else
        flags |= Qt::WindowTitleHint | Qt::WindowSystemMenuHint | Qt::WindowCloseButtonHint;
#endif
    else if (type == Qt::Tool)
        flags |= Qt::WindowTitleHint | Qt::WindowSystemMenuHint | Qt::WindowCloseButtonHint;
    else
        flags |= Qt::WindowTitleHint | Qt::WindowSystemMenuHint | Qt::WindowMinimizeButtonHint | Qt::WindowMaximizeButtonHint | Qt::WindowCloseButtonHint;


}

void QWidgetPrivate::init(QWidget *parentWidget, Qt::WindowFlags f)
{
    Q_Q(QWidget);
    if (QApplication::type() == QApplication::Tty)
        qFatal("QWidget: Cannot create a QWidget when no GUI is being used");

    Q_ASSERT(allWidgets);
    if (allWidgets)
        allWidgets->insert(q);

    QWidget *desktopWidget = 0;
    if (parentWidget && parentWidget->windowType() == Qt::Desktop) {
        desktopWidget = parentWidget;
        parentWidget = 0;
    }

    q->data = &data;

#ifndef QT_NO_THREAD
    if (!parent) {
        Q_ASSERT_X(q->thread() == qApp->thread(), "QWidget",
                   "Widgets must be created in the GUI thread.");
    }
#endif

#if defined(Q_WS_X11)
    if (desktopWidget) {
        // make sure the widget is created on the same screen as the
        // programmer specified desktop widget
        xinfo = desktopWidget->d_func()->xinfo;
    }
#elif defined(Q_OS_SYMBIAN)
    if (desktopWidget) {
        symbianScreenNumber = qt_widget_private(desktopWidget)->symbianScreenNumber;
    }
#elif defined(Q_WS_QPA)
    if (desktopWidget) {
        int screen = desktopWidget->d_func()->topData()->screenIndex;
        topData()->screenIndex = screen;
        QPlatformIntegration *platform = QApplicationPrivate::platformIntegration();
        platform->moveToScreen(q, screen);
    }
#else
    Q_UNUSED(desktopWidget);
#endif

    data.fstrut_dirty = true;

    data.winid = 0;
    data.widget_attributes = 0;
    data.window_flags = f;
    data.window_state = 0;
    data.focus_policy = 0;
    data.context_menu_policy = Qt::DefaultContextMenu;
    data.window_modality = Qt::NonModal;

    data.sizehint_forced = 0;
    data.is_closing = 0;
    data.in_show = 0;
    data.in_set_window_state = 0;
    data.in_destructor = false;

    // Widgets with Qt::MSWindowsOwnDC (typically QGLWidget) must have a window handle.
    if (f & Qt::MSWindowsOwnDC)
        q->setAttribute(Qt::WA_NativeWindow);

//#ifdef Q_WS_MAC
//    q->setAttribute(Qt::WA_NativeWindow);
//#endif

    q->setAttribute(Qt::WA_QuitOnClose); // might be cleared in adjustQuitOnCloseAttribute()
    adjustQuitOnCloseAttribute();

    q->setAttribute(Qt::WA_WState_Hidden);

    //give potential windows a bigger "pre-initial" size; create_sys() will give them a new size later
#ifdef Q_OS_SYMBIAN
    if (isGLWidget) {
        // Don't waste GPU mem for unnecessary large egl surface until resized by application
        data.crect = QRect(0,0,1,1);
    } else {
        data.crect = parentWidget ? QRect(0,0,100,30) : QRect(0,0,360,640);
    }
#else
    data.crect = parentWidget ? QRect(0,0,100,30) : QRect(0,0,640,480);
#endif

    focus_next = focus_prev = q;

    if ((f & Qt::WindowType_Mask) == Qt::Desktop)
        q->create();
    else if (parentWidget)
        q->setParent(parentWidget, data.window_flags);
    else {
        adjustFlags(data.window_flags, q);
        resolveLayoutDirection();
        // opaque system background?
        const QBrush &background = q->palette().brush(QPalette::Window);
        setOpaque(q->isWindow() && background.style() != Qt::NoBrush && background.isOpaque());
    }
    data.fnt = QFont(data.fnt, q);
#if defined(Q_WS_X11)
    data.fnt.x11SetScreen(xinfo.screen());
#endif // Q_WS_X11

    q->setAttribute(Qt::WA_PendingMoveEvent);
    q->setAttribute(Qt::WA_PendingResizeEvent);

    if (++QWidgetPrivate::instanceCounter > QWidgetPrivate::maxInstances)
        QWidgetPrivate::maxInstances = QWidgetPrivate::instanceCounter;

    if (QApplicationPrivate::app_compile_version < 0x040200
        || QApplicationPrivate::testAttribute(Qt::AA_ImmediateWidgetCreation))
        q->create();


    QEvent e(QEvent::Create);
    QApplication::sendEvent(q, &e);
    QApplication::postEvent(q, new QEvent(QEvent::PolishRequest));

    extraPaintEngine = 0;
}



void QWidgetPrivate::createRecursively()
{
    Q_Q(QWidget);
    q->create(0, true, true);
    for (int i = 0; i < children.size(); ++i) {
        QWidget *child = qobject_cast<QWidget *>(children.at(i));
        if (child && !child->isHidden() && !child->isWindow() && !child->testAttribute(Qt::WA_WState_Created))
            child->d_func()->createRecursively();
    }
}




void QWidget::create(WId window, bool initializeWindow, bool destroyOldWindow)
{
    Q_D(QWidget);
    if (testAttribute(Qt::WA_WState_Created) && window == 0 && internalWinId())
        return;

    if (d->data.in_destructor)
        return;

    Qt::WindowType type = windowType();
    Qt::WindowFlags &flags = data->window_flags;

    if ((type == Qt::Widget || type == Qt::SubWindow) && !parentWidget()) {
        type = Qt::Window;
        flags |= Qt::Window;
    }

#ifndef Q_WS_QPA
    if (QWidget *parent = parentWidget()) {
        if (type & Qt::Window) {
            if (!parent->testAttribute(Qt::WA_WState_Created))
                parent->createWinId();
        } else if (testAttribute(Qt::WA_NativeWindow) && !parent->internalWinId()
                   && !testAttribute(Qt::WA_DontCreateNativeAncestors)) {
            // We're about to create a native child widget that doesn't have a native parent;
            // enforce a native handle for the parent unless the Qt::WA_DontCreateNativeAncestors
            // attribute is set.
            d->createWinId(window);
            // Nothing more to do.
            Q_ASSERT(testAttribute(Qt::WA_WState_Created));
            Q_ASSERT(internalWinId());
            return;
        }
    }
#endif //Q_WS_QPA

#ifdef QT3_SUPPORT
    if (flags & Qt::WStaticContents)
        setAttribute(Qt::WA_StaticContents);
    if (flags & Qt::WDestructiveClose)
        setAttribute(Qt::WA_DeleteOnClose);
    if (flags & Qt::WShowModal)
        setWindowModality(Qt::ApplicationModal);
    if (flags & Qt::WMouseNoMask)
        setAttribute(Qt::WA_MouseNoMask);
    if (flags & Qt::WGroupLeader)
        setAttribute(Qt::WA_GroupLeader);
    if (flags & Qt::WNoMousePropagation)
        setAttribute(Qt::WA_NoMousePropagation);
#endif

    static int paintOnScreenEnv = -1;
    if (paintOnScreenEnv == -1)
        paintOnScreenEnv = qgetenv("QT_ONSCREEN_PAINT").toInt() > 0 ? 1 : 0;
    if (paintOnScreenEnv == 1)
        setAttribute(Qt::WA_PaintOnScreen);

    if (QApplicationPrivate::testAttribute(Qt::AA_NativeWindows))
        setAttribute(Qt::WA_NativeWindow);

#ifdef ALIEN_DEBUG
    qDebug() << "QWidget::create:" << this << "parent:" << parentWidget()
             << "Alien?" << !testAttribute(Qt::WA_NativeWindow);
#endif

#if defined (Q_WS_WIN) && !defined(QT_NO_DRAGANDDROP)
    // Unregister the dropsite (if already registered) before we
    // re-create the widget with a native window.
    if (testAttribute(Qt::WA_WState_Created) && !internalWinId() && testAttribute(Qt::WA_NativeWindow)
            && d->extra && d->extra->dropTarget) {
        d->registerDropSite(false);
    }
#endif // defined (Q_WS_WIN) && !defined(QT_NO_DRAGANDDROP)

    d->updateIsOpaque();

    setAttribute(Qt::WA_WState_Created);                        // set created flag
    d->create_sys(window, initializeWindow, destroyOldWindow);

    // a real toplevel window needs a backing store
    if (isWindow() && windowType() != Qt::Desktop) {
        d->topData()->backingStore.destroy();
        if (hasBackingStoreSupport())
            d->topData()->backingStore.create(this);
    }

    d->setModal_sys();

    if (!isWindow() && parentWidget() && parentWidget()->testAttribute(Qt::WA_DropSiteRegistered))
        setAttribute(Qt::WA_DropSiteRegistered, true);

#ifdef QT_EVAL
    extern void qt_eval_init_widget(QWidget *w);
    qt_eval_init_widget(this);
#endif

    // need to force the resting of the icon after changing parents
    if (testAttribute(Qt::WA_SetWindowIcon))
        d->setWindowIcon_sys(true);
    if (isWindow() && !d->topData()->iconText.isEmpty())
        d->setWindowIconText_helper(d->topData()->iconText);
    if (isWindow() && !d->topData()->caption.isEmpty())
        d->setWindowTitle_helper(d->topData()->caption);
    if (windowType() != Qt::Desktop) {
        d->updateSystemBackground();

        if (isWindow() && !testAttribute(Qt::WA_SetWindowIcon))
            d->setWindowIcon_sys();
    }
}

QWidget::~QWidget()
{
    Q_D(QWidget);
    d->data.in_destructor = true;

#if defined (QT_CHECK_STATE)
    if (paintingActive())
        qWarning("QWidget: %s (%s) deleted while being painted", className(), name());
#endif

#ifndef QT_NO_GESTURES
    foreach (Qt::GestureType type, d->gestureContext.keys())
        ungrabGesture(type);
#endif

    // force acceptDrops false before winId is destroyed.
    d->registerDropSite(false);

#ifndef QT_NO_ACTION
    // remove all actions from this widget
    for (int i = 0; i < d->actions.size(); ++i) {
        QActionPrivate *apriv = d->actions.at(i)->d_func();
        apriv->widgets.removeAll(this);
    }
    d->actions.clear();
#endif

#ifndef QT_NO_SHORTCUT
    // Remove all shortcuts grabbed by this
    // widget, unless application is closing
    if (!QApplicationPrivate::is_app_closing && testAttribute(Qt::WA_GrabbedShortcut))
        qApp->d_func()->shortcutMap.removeShortcut(0, this, QKeySequence());
#endif

    // delete layout while we still are a valid widget
    delete d->layout;
    d->layout = 0;
    // Remove myself from focus list

    Q_ASSERT(d->focus_next->d_func()->focus_prev == this);
    Q_ASSERT(d->focus_prev->d_func()->focus_next == this);

    if (d->focus_next != this) {
        d->focus_next->d_func()->focus_prev = d->focus_prev;
        d->focus_prev->d_func()->focus_next = d->focus_next;
        d->focus_next = d->focus_prev = 0;
    }

#ifdef QT3_SUPPORT
    if (QApplicationPrivate::main_widget == this) {        // reset main widget
        QApplicationPrivate::main_widget = 0;
        QApplication::quit();
    }
#endif

    QT_TRY {
        clearFocus();
    } QT_CATCH(...) {
        // swallow this problem because we are in a destructor
    }

    d->setDirtyOpaqueRegion();

    if (isWindow() && isVisible() && internalWinId()) {
        QT_TRY {
            d->close_helper(QWidgetPrivate::CloseNoEvent);
        } QT_CATCH(...) {
            // if we're out of memory, at least hide the window.
            QT_TRY {
                hide();
            } QT_CATCH(...) {
                // and if that also doesn't work, then give up
            }
        }
    }

#if defined(Q_WS_WIN) || defined(Q_WS_X11)|| defined(Q_WS_MAC)
    else if (!internalWinId() && isVisible()) {
        qApp->d_func()->sendSyntheticEnterLeave(this);
    }
#elif defined(Q_WS_QWS) || defined(Q_WS_QPA)
    else if (isVisible()) {
        qApp->d_func()->sendSyntheticEnterLeave(this);
    }
#endif

#ifdef Q_OS_SYMBIAN
    if (d->extra && d->extra->topextra && d->extra->topextra->backingStore) {
        // Okay, we are about to destroy the top-level window that owns
        // the backing store. Make sure we delete the backing store right away
        // before the window handle is invalid. This is important because
        // the backing store will delete its window surface, which may or may
        // not have a reference to this widget that will be used later to
        // notify the window it no longer has a surface.
        d->extra->topextra->backingStore.destroy();
    }
#endif
    if (QWidgetBackingStore *bs = d->maybeBackingStore()) {
        bs->removeDirtyWidget(this);
        if (testAttribute(Qt::WA_StaticContents))
            bs->removeStaticWidget(this);
    }

    delete d->needsFlush;
    d->needsFlush = 0;

    // set all QPointers for this object to zero
    if (d->hasGuards)
        QObjectPrivate::clearGuards(this);

    if (d->declarativeData) {
        QAbstractDeclarativeData::destroyed(d->declarativeData, this);
        d->declarativeData = 0;                 // don't activate again in ~QObject
    }

#ifdef QT_MAC_USE_COCOA
    // QCocoaView holds a pointer back to this widget. Clear it now
    // to make sure it's not followed later on. The lifetime of the
    // QCocoaView might exceed the lifetime of this widget in cases
    // where Cocoa itself holds references to it.
    extern void qt_mac_clearCocoaViewQWidgetPointers(QWidget *);
    qt_mac_clearCocoaViewQWidgetPointers(this);
#endif

    if (!d->children.isEmpty())
        d->deleteChildren();

#ifndef QT_NO_ACCESSIBILITY
    QAccessible::updateAccessibility(this, 0, QAccessible::ObjectDestroyed);
#endif

    QApplication::removePostedEvents(this);

    QT_TRY {
        destroy();                                        // platform-dependent cleanup
    } QT_CATCH(...) {
        // if this fails we can't do anything about it but at least we are not allowed to throw.
    }
    --QWidgetPrivate::instanceCounter;

    if (QWidgetPrivate::allWidgets) // might have been deleted by ~QApplication
        QWidgetPrivate::allWidgets->remove(this);

    QT_TRY {
        QEvent e(QEvent::Destroy);
        QCoreApplication::sendEvent(this, &e);
    } QT_CATCH(const std::exception&) {
        // if this fails we can't do anything about it but at least we are not allowed to throw.
    }
}

int QWidgetPrivate::instanceCounter = 0;  // Current number of widget instances
int QWidgetPrivate::maxInstances = 0;     // Maximum number of widget instances

void QWidgetPrivate::setWinId(WId id)                // set widget identifier
{
    Q_Q(QWidget);
    // the user might create a widget with Qt::Desktop window
    // attribute (or create another QDesktopWidget instance), which
    // will have the same windowid (the root window id) as the
    // qt_desktopWidget. We should not add the second desktop widget
    // to the mapper.
    bool userDesktopWidget = qt_desktopWidget != 0 && qt_desktopWidget != q && q->windowType() == Qt::Desktop;
    if (mapper && data.winid && !userDesktopWidget) {
        mapper->remove(data.winid);
    }

    const WId oldWinId = data.winid;

    data.winid = id;
#if defined(Q_WS_X11)
    hd = id; // X11: hd == ident
#endif
    if (mapper && id && !userDesktopWidget) {
        mapper->insert(data.winid, q);
    }

    if(oldWinId != id) {
        QEvent e(QEvent::WinIdChange);
        QCoreApplication::sendEvent(q, &e);
    }
}

void QWidgetPrivate::createTLExtra()
{
    if (!extra)
        createExtra();
    if (!extra->topextra) {
        QTLWExtra* x = extra->topextra = new QTLWExtra;
        x->icon = 0;
        x->iconPixmap = 0;
        x->windowSurface = 0;
        x->sharedPainter = 0;
        x->incw = x->inch = 0;
        x->basew = x->baseh = 0;
        x->frameStrut.setCoords(0, 0, 0, 0);
        x->normalGeometry = QRect(0,0,-1,-1);
        x->savedFlags = 0;
        x->opacity = 255;
        x->posFromMove = false;
        x->sizeAdjusted = false;
        x->inTopLevelResize = false;
        x->inRepaint = false;
        x->embedded = 0;
#ifdef Q_WS_MAC
#ifdef QT_MAC_USE_COCOA
        x->wasMaximized = false;
#endif // QT_MAC_USE_COCOA
#endif // Q_WS_MAC
        createTLSysExtra();
#ifdef QWIDGET_EXTRA_DEBUG
        static int count = 0;
        qDebug() << "tlextra" << ++count;
#endif
#if defined(Q_WS_QPA)
        x->platformWindow = 0;
        x->platformWindowFormat = QPlatformWindowFormat::defaultFormat();
        x->screenIndex = 0;
#endif
    }
}

void QWidgetPrivate::createExtra()
{
    if (!extra) {                                // if not exists
        extra = new QWExtra;
        extra->glContext = 0;
        extra->topextra = 0;
#ifndef QT_NO_GRAPHICSVIEW
        extra->proxyWidget = 0;
#endif
#ifndef QT_NO_CURSOR
        extra->curs = 0;
#endif
        extra->minw = 0;
        extra->minh = 0;
        extra->maxw = QWIDGETSIZE_MAX;
        extra->maxh = QWIDGETSIZE_MAX;
        extra->customDpiX = 0;
        extra->customDpiY = 0;
        extra->explicitMinSize = 0;
        extra->explicitMaxSize = 0;
        extra->autoFillBackground = 0;
        extra->nativeChildrenForced = 0;
        extra->inRenderWithPainter = 0;
        extra->hasMask = 0;
        createSysExtra();
#ifdef QWIDGET_EXTRA_DEBUG
        static int count = 0;
        qDebug() << "extra" << ++count;
#endif
    }
}


void QWidgetPrivate::deleteExtra()
{
    if (extra) {                                // if exists
#ifndef QT_NO_CURSOR
        delete extra->curs;
#endif
        deleteSysExtra();
#ifndef QT_NO_STYLE_STYLESHEET
        // dereference the stylesheet style
        if (QStyleSheetStyle *proxy = qobject_cast<QStyleSheetStyle *>(extra->style))
            proxy->deref();
#endif
        if (extra->topextra) {
            deleteTLSysExtra();
            extra->topextra->backingStore.destroy();
            delete extra->topextra->icon;
            delete extra->topextra->iconPixmap;
#if defined(Q_WS_QWS) && !defined(QT_NO_QWS_MANAGER)
            delete extra->topextra->qwsManager;
#endif
            delete extra->topextra->windowSurface;
            delete extra->topextra;
        }
        delete extra;
        // extra->xic destroyed in QWidget::destroy()
        extra = 0;
    }
}

/*
  Returns true if there are widgets above this which overlap with
  \a rect, which is in parent's coordinate system (same as crect).
*/

bool QWidgetPrivate::isOverlapped(const QRect &rect) const
{
    Q_Q(const QWidget);

    const QWidget *w = q;
    QRect r = rect;
    while (w) {
        if (w->isWindow())
            return false;
        QWidgetPrivate *pd = w->parentWidget()->d_func();
        bool above = false;
        for (int i = 0; i < pd->children.size(); ++i) {
            QWidget *sibling = qobject_cast<QWidget *>(pd->children.at(i));
            if (!sibling || !sibling->isVisible() || sibling->isWindow())
                continue;
            if (!above) {
                above = (sibling == w);
                continue;
            }

            if (qRectIntersects(sibling->d_func()->effectiveRectFor(sibling->data->crect), r)) {
                const QWExtra *siblingExtra = sibling->d_func()->extra;
                if (siblingExtra && siblingExtra->hasMask && !sibling->d_func()->graphicsEffect
                    && !siblingExtra->mask.translated(sibling->data->crect.topLeft()).intersects(r)) {
                    continue;
                }
                return true;
            }
        }
        w = w->parentWidget();
        r.translate(pd->data.crect.topLeft());
    }
    return false;
}

void QWidgetPrivate::syncBackingStore()
{
    if (paintOnScreen()) {
        repaint_sys(dirty);
        dirty = QRegion();
    } else if (QWidgetBackingStore *bs = maybeBackingStore()) {
        bs->sync();
    }
}

void QWidgetPrivate::syncBackingStore(const QRegion &region)
{
    if (paintOnScreen())
        repaint_sys(region);
    else if (QWidgetBackingStore *bs = maybeBackingStore()) {
        bs->sync(q_func(), region);
    }
}

void QWidgetPrivate::setUpdatesEnabled_helper(bool enable)
{
    Q_Q(QWidget);

    if (enable && !q->isWindow() && q->parentWidget() && !q->parentWidget()->updatesEnabled())
        return; // nothing we can do

    if (enable != q->testAttribute(Qt::WA_UpdatesDisabled))
        return; // nothing to do

    q->setAttribute(Qt::WA_UpdatesDisabled, !enable);
    if (enable)
        q->update();

    Qt::WidgetAttribute attribute = enable ? Qt::WA_ForceUpdatesDisabled : Qt::WA_UpdatesDisabled;
    for (int i = 0; i < children.size(); ++i) {
        QWidget *w = qobject_cast<QWidget *>(children.at(i));
        if (w && !w->isWindow() && !w->testAttribute(attribute))
            w->d_func()->setUpdatesEnabled_helper(enable);
    }
}

void QWidgetPrivate::propagatePaletteChange()
{
    Q_Q(QWidget);
    // Propagate a new inherited mask to all children.
#ifndef QT_NO_GRAPHICSVIEW
    if (!q->parentWidget() && extra && extra->proxyWidget) {
        QGraphicsProxyWidget *p = extra->proxyWidget;
        inheritedPaletteResolveMask = p->d_func()->inheritedPaletteResolveMask | p->palette().resolve();
    } else
#endif //QT_NO_GRAPHICSVIEW
        if (q->isWindow() && !q->testAttribute(Qt::WA_WindowPropagation)) {
        inheritedPaletteResolveMask = 0;
    }
    int mask = data.pal.resolve() | inheritedPaletteResolveMask;

    QEvent pc(QEvent::PaletteChange);
    QApplication::sendEvent(q, &pc);
    for (int i = 0; i < children.size(); ++i) {
        QWidget *w = qobject_cast<QWidget*>(children.at(i));
        if (w && !w->testAttribute(Qt::WA_StyleSheet)
            && (!w->isWindow() || w->testAttribute(Qt::WA_WindowPropagation))) {
            QWidgetPrivate *wd = w->d_func();
            wd->inheritedPaletteResolveMask = mask;
            wd->resolvePalette();
        }
    }
#if defined(QT3_SUPPORT)
    q->paletteChange(q->palette()); // compatibility
#endif
}

/*
  Returns the widget's clipping rectangle.
*/
QRect QWidgetPrivate::clipRect() const
{
    Q_Q(const QWidget);
    const QWidget * w = q;
    if (!w->isVisible())
        return QRect();
    QRect r = effectiveRectFor(q->rect());
    int ox = 0;
    int oy = 0;
    while (w
            && w->isVisible()
            && !w->isWindow()
            && w->parentWidget()) {
        ox -= w->x();
        oy -= w->y();
        w = w->parentWidget();
        r &= QRect(ox, oy, w->width(), w->height());
    }
    return r;
}

/*
  Returns the widget's clipping region (without siblings).
*/
QRegion QWidgetPrivate::clipRegion() const
{
    Q_Q(const QWidget);
    if (!q->isVisible())
        return QRegion();
    QRegion r(q->rect());
    const QWidget * w = q;
    const QWidget *ignoreUpTo;
    int ox = 0;
    int oy = 0;
    while (w
           && w->isVisible()
           && !w->isWindow()
           && w->parentWidget()) {
        ox -= w->x();
        oy -= w->y();
        ignoreUpTo = w;
        w = w->parentWidget();
        r &= QRegion(ox, oy, w->width(), w->height());

        int i = 0;
        while(w->d_func()->children.at(i++) != static_cast<const QObject *>(ignoreUpTo))
            ;
        for ( ; i < w->d_func()->children.size(); ++i) {
            if(QWidget *sibling = qobject_cast<QWidget *>(w->d_func()->children.at(i))) {
                if(sibling->isVisible() && !sibling->isWindow()) {
                    QRect siblingRect(ox+sibling->x(), oy+sibling->y(),
                                      sibling->width(), sibling->height());
                    if (qRectIntersects(siblingRect, q->rect()))
                        r -= QRegion(siblingRect);
                }
            }
        }
    }
    return r;
}

#ifndef QT_NO_GRAPHICSEFFECT
void QWidgetPrivate::invalidateGraphicsEffectsRecursively()
{
    Q_Q(QWidget);
    QWidget *w = q;
    do {
        if (w->graphicsEffect()) {
            QWidgetEffectSourcePrivate *sourced =
                static_cast<QWidgetEffectSourcePrivate *>(w->graphicsEffect()->source()->d_func());
            if (!sourced->updateDueToGraphicsEffect)
                w->graphicsEffect()->source()->d_func()->invalidateCache();
        }
        w = w->parentWidget();
    } while (w);
}
#endif //QT_NO_GRAPHICSEFFECT

void QWidgetPrivate::setDirtyOpaqueRegion()
{
    Q_Q(QWidget);

    dirtyOpaqueChildren = true;

#ifndef QT_NO_GRAPHICSEFFECT
    invalidateGraphicsEffectsRecursively();
#endif //QT_NO_GRAPHICSEFFECT

    if (q->isWindow())
        return;

    QWidget *parent = q->parentWidget();
    if (!parent)
        return;

    // TODO: instead of setting dirtyflag, manipulate the dirtyregion directly?
    QWidgetPrivate *pd = parent->d_func();
    if (!pd->dirtyOpaqueChildren)
        pd->setDirtyOpaqueRegion();
}

const QRegion &QWidgetPrivate::getOpaqueChildren() const
{
    if (!dirtyOpaqueChildren)
        return opaqueChildren;

    QWidgetPrivate *that = const_cast<QWidgetPrivate*>(this);
    that->opaqueChildren = QRegion();

    for (int i = 0; i < children.size(); ++i) {
        QWidget *child = qobject_cast<QWidget *>(children.at(i));
        if (!child || !child->isVisible() || child->isWindow())
            continue;

        const QPoint offset = child->geometry().topLeft();
        QWidgetPrivate *childd = child->d_func();
        QRegion r = childd->isOpaque ? child->rect() : childd->getOpaqueChildren();
        if (childd->extra && childd->extra->hasMask)
            r &= childd->extra->mask;
        if (r.isEmpty())
            continue;
        r.translate(offset);
        that->opaqueChildren += r;
    }

    that->opaqueChildren &= q_func()->rect();
    that->dirtyOpaqueChildren = false;

    return that->opaqueChildren;
}

void QWidgetPrivate::subtractOpaqueChildren(QRegion &source, const QRect &clipRect) const
{
    if (children.isEmpty() || clipRect.isEmpty())
        return;

    const QRegion &r = getOpaqueChildren();
    if (!r.isEmpty())
        source -= (r & clipRect);
}

//subtract any relatives that are higher up than me --- this is too expensive !!!
void QWidgetPrivate::subtractOpaqueSiblings(QRegion &sourceRegion, bool *hasDirtySiblingsAbove,
                                            bool alsoNonOpaque) const
{
    Q_Q(const QWidget);
    static int disableSubtractOpaqueSiblings = qgetenv("QT_NO_SUBTRACTOPAQUESIBLINGS").toInt();
    if (disableSubtractOpaqueSiblings || q->isWindow())
        return;

#ifdef QT_MAC_USE_COCOA
    if (q->d_func()->isInUnifiedToolbar)
        return;
#endif // QT_MAC_USE_COCOA

    QRect clipBoundingRect;
    bool dirtyClipBoundingRect = true;

    QRegion parentClip;
    bool dirtyParentClip = true;

    QPoint parentOffset = data.crect.topLeft();

    const QWidget *w = q;

    while (w) {
        if (w->isWindow())
            break;
        QWidgetPrivate *pd = w->parentWidget()->d_func();
        const int myIndex = pd->children.indexOf(const_cast<QWidget *>(w));
        const QRect widgetGeometry = w->d_func()->effectiveRectFor(w->data->crect);
        for (int i = myIndex + 1; i < pd->children.size(); ++i) {
            QWidget *sibling = qobject_cast<QWidget *>(pd->children.at(i));
            if (!sibling || !sibling->isVisible() || sibling->isWindow())
                continue;

            const QRect siblingGeometry = sibling->d_func()->effectiveRectFor(sibling->data->crect);
            if (!qRectIntersects(siblingGeometry, widgetGeometry))
                continue;

            if (dirtyClipBoundingRect) {
                clipBoundingRect = sourceRegion.boundingRect();
                dirtyClipBoundingRect = false;
            }

            if (!qRectIntersects(siblingGeometry, clipBoundingRect.translated(parentOffset)))
                continue;

            if (dirtyParentClip) {
                parentClip = sourceRegion.translated(parentOffset);
                dirtyParentClip = false;
            }

            const QPoint siblingPos(sibling->data->crect.topLeft());
            const QRect siblingClipRect(sibling->d_func()->clipRect());
            QRegion siblingDirty(parentClip);
            siblingDirty &= (siblingClipRect.translated(siblingPos));
            const bool hasMask = sibling->d_func()->extra && sibling->d_func()->extra->hasMask
                                 && !sibling->d_func()->graphicsEffect;
            if (hasMask)
                siblingDirty &= sibling->d_func()->extra->mask.translated(siblingPos);
            if (siblingDirty.isEmpty())
                continue;

            if (sibling->d_func()->isOpaque || alsoNonOpaque) {
                if (hasMask) {
                    siblingDirty.translate(-parentOffset);
                    sourceRegion -= siblingDirty;
                } else {
                    sourceRegion -= siblingGeometry.translated(-parentOffset);
                }
            } else {
                if (hasDirtySiblingsAbove)
                    *hasDirtySiblingsAbove = true;
                if (sibling->d_func()->children.isEmpty())
                    continue;
                QRegion opaqueSiblingChildren(sibling->d_func()->getOpaqueChildren());
                opaqueSiblingChildren.translate(-parentOffset + siblingPos);
                sourceRegion -= opaqueSiblingChildren;
            }
            if (sourceRegion.isEmpty())
                return;

            dirtyClipBoundingRect = true;
            dirtyParentClip = true;
        }

        w = w->parentWidget();
        parentOffset += pd->data.crect.topLeft();
        dirtyParentClip = true;
    }
}

void QWidgetPrivate::clipToEffectiveMask(QRegion &region) const
{
    Q_Q(const QWidget);

    const QWidget *w = q;
    QPoint offset;

#ifndef QT_NO_GRAPHICSEFFECT
    if (graphicsEffect) {
        w = q->parentWidget();
        offset -= data.crect.topLeft();
    }
#endif //QT_NO_GRAPHICSEFFECT

    while (w) {
        const QWidgetPrivate *wd = w->d_func();
        if (wd->extra && wd->extra->hasMask)
            region &= (w != q) ? wd->extra->mask.translated(offset) : wd->extra->mask;
        if (w->isWindow())
            return;
        offset -= wd->data.crect.topLeft();
        w = w->parentWidget();
    }
}

bool QWidgetPrivate::paintOnScreen() const
{
#if defined(Q_WS_QWS)
    return false;
#elif  defined(QT_NO_BACKINGSTORE)
    return true;
#else
    Q_Q(const QWidget);
    if (q->testAttribute(Qt::WA_PaintOnScreen)
            || (!q->isWindow() && q->window()->testAttribute(Qt::WA_PaintOnScreen))) {
        return true;
    }

    return !qt_enable_backingstore;
#endif
}

void QWidgetPrivate::updateIsOpaque()
{
    // hw: todo: only needed if opacity actually changed
    setDirtyOpaqueRegion();

#ifndef QT_NO_GRAPHICSEFFECT
    if (graphicsEffect) {
        // ### We should probably add QGraphicsEffect::isOpaque at some point.
        setOpaque(false);
        return;
    }
#endif //QT_NO_GRAPHICSEFFECT

    Q_Q(QWidget);
#ifdef Q_WS_X11
    if (q->testAttribute(Qt::WA_X11OpenGLOverlay)) {
        setOpaque(false);
        return;
    }
#endif

#ifdef Q_WS_S60
    if (q->testAttribute(Qt::WA_TranslucentBackground)) {
        if (q->windowType() & Qt::Dialog || q->windowType() & Qt::Popup) {
            if (S60->avkonComponentsSupportTransparency) {
                setOpaque(false);
                return;
            }
        } else {
            setOpaque(false);
            return;
        }
    }
#endif

    if (q->testAttribute(Qt::WA_OpaquePaintEvent) || q->testAttribute(Qt::WA_PaintOnScreen)) {
        setOpaque(true);
        return;
    }

    const QPalette &pal = q->palette();

    if (q->autoFillBackground()) {
        const QBrush &autoFillBrush = pal.brush(q->backgroundRole());
        if (autoFillBrush.style() != Qt::NoBrush && autoFillBrush.isOpaque()) {
            setOpaque(true);
            return;
        }
    }

    if (q->isWindow() && !q->testAttribute(Qt::WA_NoSystemBackground)) {
#ifdef Q_WS_S60
        setOpaque(true);
        return;
#else
        const QBrush &windowBrush = q->palette().brush(QPalette::Window);
        if (windowBrush.style() != Qt::NoBrush && windowBrush.isOpaque()) {
            setOpaque(true);
            return;
        }
#endif
    }
    setOpaque(false);
}

void QWidgetPrivate::setOpaque(bool opaque)
{
    if (isOpaque == opaque)
        return;
    isOpaque = opaque;
#ifdef Q_WS_MAC
    macUpdateIsOpaque();
#endif
#ifdef Q_WS_X11
    x11UpdateIsOpaque();
#endif
#ifdef Q_WS_WIN
    winUpdateIsOpaque();
#endif
#ifdef Q_OS_SYMBIAN
    s60UpdateIsOpaque();
#endif
}

void QWidgetPrivate::updateIsTranslucent()
{
#ifdef Q_WS_MAC
    macUpdateIsOpaque();
#endif
#ifdef Q_WS_X11
    x11UpdateIsOpaque();
#endif
#ifdef Q_WS_WIN
    winUpdateIsOpaque();
#endif
#ifdef Q_OS_SYMBIAN
    s60UpdateIsOpaque();
#endif
}

void QPixmap::fill( const QWidget *widget, const QPoint &off )
{
    QPainter p(this);
    p.translate(-off);
    widget->d_func()->paintBackground(&p, QRect(off, size()));
}

static inline void fillRegion(QPainter *painter, const QRegion &rgn, const QBrush &brush)
{
    Q_ASSERT(painter);

    if (brush.style() == Qt::TexturePattern) {
#ifdef Q_WS_MAC
        // Optimize pattern filling on mac by using HITheme directly
        // when filling with the standard widget background.
        // Defined in qmacstyle_mac.cpp
        extern void qt_mac_fill_background(QPainter *painter, const QRegion &rgn, const QBrush &brush);
        qt_mac_fill_background(painter, rgn, brush);
#else
#if !defined(QT_NO_STYLE_S60)
        // Defined in qs60style.cpp
        extern bool qt_s60_fill_background(QPainter *painter, const QRegion &rgn, const QBrush &brush);
        if (!qt_s60_fill_background(painter, rgn, brush))
#endif // !defined(QT_NO_STYLE_S60)
        {
            const QRect rect(rgn.boundingRect());
            painter->setClipRegion(rgn);
            painter->drawTiledPixmap(rect, brush.texture(), rect.topLeft());
        }
#endif // Q_WS_MAC

    } else if (brush.gradient()
               && brush.gradient()->coordinateMode() == QGradient::ObjectBoundingMode) {
        painter->save();
        painter->setClipRegion(rgn);
        painter->fillRect(0, 0, painter->device()->width(), painter->device()->height(), brush);
        painter->restore();
    } else {
        const QVector<QRect> &rects = rgn.rects();
        for (int i = 0; i < rects.size(); ++i)
            painter->fillRect(rects.at(i), brush);
    }
}

void QWidgetPrivate::paintBackground(QPainter *painter, const QRegion &rgn, int flags) const
{
    Q_Q(const QWidget);

#ifndef QT_NO_SCROLLAREA
    bool resetBrushOrigin = false;
    QPointF oldBrushOrigin;
    //If we are painting the viewport of a scrollarea, we must apply an offset to the brush in case we are drawing a texture
    QAbstractScrollArea *scrollArea = qobject_cast<QAbstractScrollArea *>(parent);
    if (scrollArea && scrollArea->viewport() == q) {
        QObjectData *scrollPrivate = static_cast<QWidget *>(scrollArea)->d_ptr.data();
        QAbstractScrollAreaPrivate *priv = static_cast<QAbstractScrollAreaPrivate *>(scrollPrivate);
        oldBrushOrigin = painter->brushOrigin();
        resetBrushOrigin = true;
        painter->setBrushOrigin(-priv->contentsOffset());

    }
#endif // QT_NO_SCROLLAREA

    const QBrush autoFillBrush = q->palette().brush(q->backgroundRole());

    if ((flags & DrawAsRoot) && !(q->autoFillBackground() && autoFillBrush.isOpaque())) {
        const QBrush bg = q->palette().brush(QPalette::Window);
#if defined(Q_WS_QWS) || defined(Q_WS_QPA)
        if (!(flags & DontSetCompositionMode)) {
            //copy alpha straight in
            QPainter::CompositionMode oldMode = painter->compositionMode();
            painter->setCompositionMode(QPainter::CompositionMode_Source);
            fillRegion(painter, rgn, bg);
            painter->setCompositionMode(oldMode);
        } else {
            fillRegion(painter, rgn, bg);
        }
#else
        fillRegion(painter, rgn, bg);
#endif
    }

    if (q->autoFillBackground())
        fillRegion(painter, rgn, autoFillBrush);

    if (q->testAttribute(Qt::WA_StyledBackground)) {
        painter->setClipRegion(rgn);
        QStyleOption opt;
        opt.initFrom(q);
        q->style()->drawPrimitive(QStyle::PE_Widget, &opt, painter, q);
    }

#ifndef QT_NO_SCROLLAREA
    if (resetBrushOrigin)
        painter->setBrushOrigin(oldBrushOrigin);
#endif // QT_NO_SCROLLAREA
}

/*
  \internal
  This function is called when a widget is hidden or destroyed.
  It resets some application global pointers that should only refer active,
  visible widgets.
*/

#ifdef Q_WS_MAC
    extern QPointer<QWidget> qt_button_down;
#else
    extern QWidget *qt_button_down;
#endif

void QWidgetPrivate::deactivateWidgetCleanup()
{
    Q_Q(QWidget);
    // If this was the active application window, reset it
    if (QApplication::activeWindow() == q)
        QApplication::setActiveWindow(0);
    // If the is the active mouse press widget, reset it
    if (q == qt_button_down)
        qt_button_down = 0;
}


QWidget *QWidget::find(WId id)
{
    return QWidgetPrivate::mapper ? QWidgetPrivate::mapper->value(id, 0) : 0;
}



WId QWidget::winId() const
{
    if (!testAttribute(Qt::WA_WState_Created) || !internalWinId()) {
#ifdef ALIEN_DEBUG
        qDebug() << "QWidget::winId: creating native window for" << this;
#endif
        QWidget *that = const_cast<QWidget*>(this);
#ifndef Q_WS_QPA
        that->setAttribute(Qt::WA_NativeWindow);
#endif
        that->d_func()->createWinId();
        return that->data->winid;
    }
    return data->winid;
}


void QWidgetPrivate::createWinId(WId winid)
{
    Q_Q(QWidget);

#ifdef ALIEN_DEBUG
    qDebug() << "QWidgetPrivate::createWinId for" << q << winid;
#endif
    const bool forceNativeWindow = q->testAttribute(Qt::WA_NativeWindow);
    if (!q->testAttribute(Qt::WA_WState_Created) || (forceNativeWindow && !q->internalWinId())) {
#ifndef Q_WS_QPA
        if (!q->isWindow()) {
            QWidget *parent = q->parentWidget();
            QWidgetPrivate *pd = parent->d_func();
            if (forceNativeWindow && !q->testAttribute(Qt::WA_DontCreateNativeAncestors))
                parent->setAttribute(Qt::WA_NativeWindow);
            if (!parent->internalWinId()) {
                pd->createWinId();
            }

            for (int i = 0; i < pd->children.size(); ++i) {
                QWidget *w = qobject_cast<QWidget *>(pd->children.at(i));
                if (w && !w->isWindow() && (!w->testAttribute(Qt::WA_WState_Created)
                                            || (!w->internalWinId() && w->testAttribute(Qt::WA_NativeWindow)))) {
                    if (w!=q) {
                        w->create();
                    } else {
                        w->create(winid);
                        // if the window has already been created, we
                        // need to raise it to its proper stacking position
                        if (winid)
                            w->raise();
                    }
                }
            }
        } else {
            q->create();
        }
#else
        Q_UNUSED(winid);
        q->create();
#endif //Q_WS_QPA

    }
}


void QWidget::createWinId()
{
    Q_D(QWidget);
#ifdef ALIEN_DEBUG
    qDebug()  << "QWidget::createWinId" << this;
#endif
//    qWarning("QWidget::createWinId is obsolete, please fix your code.");
    d->createWinId();
}

WId QWidget::effectiveWinId() const
{
    WId id = internalWinId();
    if (id || !testAttribute(Qt::WA_WState_Created))
        return id;
    QWidget *realParent = nativeParentWidget();
    if (!realParent && d_func()->inSetParent) {
        // In transitional state. This is really just a workaround. The real problem
        // is that QWidgetPrivate::setParent_sys (platform specific code) first sets
        // the window id to 0 (setWinId(0)) before it sets the Qt::WA_WState_Created
        // attribute to false. The correct way is to do it the other way around, and
        // in that case the Qt::WA_WState_Created logic above will kick in and
        // return 0 whenever the widget is in a transitional state. However, changing
        // the original logic for all platforms is far more intrusive and might
        // break existing applications.
        // Note: The widget can only be in a transitional state when changing its
        // parent -- everything else is an internal error -- hence explicitly checking
        // against 'inSetParent' rather than doing an unconditional return whenever
        // 'realParent' is 0 (which may cause strange artifacts and headache later).
        return 0;
    }
    // This widget *must* have a native parent widget.
    Q_ASSERT(realParent);
    Q_ASSERT(realParent->internalWinId());
    return realParent->internalWinId();
}

#ifndef QT_NO_STYLE_STYLESHEET

QString QWidget::styleSheet() const
{
    Q_D(const QWidget);
    if (!d->extra)
        return QString();
    return d->extra->styleSheet;
}

void QWidget::setStyleSheet(const QString& styleSheet)
{
    Q_D(QWidget);
    d->createExtra();

    QStyleSheetStyle *proxy = qobject_cast<QStyleSheetStyle *>(d->extra->style);
    d->extra->styleSheet = styleSheet;
    if (styleSheet.isEmpty()) { // stylesheet removed
        if (!proxy)
            return;

        d->inheritStyle();
        return;
    }

    if (proxy) { // style sheet update
        proxy->repolish(this);
        return;
    }

    if (testAttribute(Qt::WA_SetStyle)) {
        d->setStyle_helper(new QStyleSheetStyle(d->extra->style), true);
    } else {
        d->setStyle_helper(new QStyleSheetStyle(0), true);
    }
}

#endif // QT_NO_STYLE_STYLESHEET

QStyle *QWidget::style() const
{
    Q_D(const QWidget);

    if (d->extra && d->extra->style)
        return d->extra->style;
    return QApplication::style();
}

void QWidget::setStyle(QStyle *style)
{
    Q_D(QWidget);
    setAttribute(Qt::WA_SetStyle, style != 0);
    d->createExtra();
#ifndef QT_NO_STYLE_STYLESHEET
    if (QStyleSheetStyle *proxy = qobject_cast<QStyleSheetStyle *>(style)) {
        //if for some reason someone try to set a QStyleSheetStyle, ref it
        //(this may happen for exemple in QButtonDialogBox which propagates its style)
        proxy->ref();
        d->setStyle_helper(style, false);
    } else if (qobject_cast<QStyleSheetStyle *>(d->extra->style) || !qApp->styleSheet().isEmpty()) {
        // if we have an application stylesheet or have a proxy already, propagate
        d->setStyle_helper(new QStyleSheetStyle(style), true);
    } else
#endif
        d->setStyle_helper(style, false);
}

void QWidgetPrivate::setStyle_helper(QStyle *newStyle, bool propagate, bool
#ifdef Q_WS_MAC
        metalHack
#endif
        )
{
    Q_Q(QWidget);
    QStyle *oldStyle  = q->style();
#ifndef QT_NO_STYLE_STYLESHEET
    QWeakPointer<QStyle> origStyle;
#endif

#ifdef Q_WS_MAC
    // the metalhack boolean allows Qt/Mac to do a proper re-polish depending
    // on how the Qt::WA_MacBrushedMetal attribute is set. It is only ever
    // set when changing that attribute and passes the widget's CURRENT style.
    // therefore no need to do a reassignment.
    if (!metalHack)
#endif
    {
        createExtra();

#ifndef QT_NO_STYLE_STYLESHEET
        origStyle = extra->style.data();
#endif
        extra->style = newStyle;
    }

    // repolish
    if (q->windowType() != Qt::Desktop) {
        if (polished) {
            oldStyle->unpolish(q);
#ifdef Q_WS_MAC
            if (metalHack)
                macUpdateMetalAttribute();
#endif
            q->style()->polish(q);
#ifdef Q_WS_MAC
        } else if (metalHack) {
            macUpdateMetalAttribute();
#endif
        }
    }

    if (propagate) {
        for (int i = 0; i < children.size(); ++i) {
            QWidget *c = qobject_cast<QWidget*>(children.at(i));
            if (c)
                c->d_func()->inheritStyle();
        }
    }

#ifndef QT_NO_STYLE_STYLESHEET
    if (!qobject_cast<QStyleSheetStyle*>(newStyle)) {
        if (const QStyleSheetStyle* cssStyle = qobject_cast<QStyleSheetStyle*>(origStyle.data())) {
            cssStyle->clearWidgetFont(q);
        }
    }
#endif

    QEvent e(QEvent::StyleChange);
    QApplication::sendEvent(q, &e);
#ifdef QT3_SUPPORT
    q->styleChange(*oldStyle);
#endif

#ifndef QT_NO_STYLE_STYLESHEET
    // dereference the old stylesheet style
    if (QStyleSheetStyle *proxy = qobject_cast<QStyleSheetStyle *>(origStyle.data()))
        proxy->deref();
#endif
}

// Inherits style from the current parent and propagates it as necessary
void QWidgetPrivate::inheritStyle()
{
#ifndef QT_NO_STYLE_STYLESHEET
    Q_Q(QWidget);

    QStyleSheetStyle *proxy = extra ? qobject_cast<QStyleSheetStyle *>(extra->style) : 0;

    if (!q->styleSheet().isEmpty()) {
        Q_ASSERT(proxy);
        proxy->repolish(q);
        return;
    }

    QStyle *origStyle = proxy ? proxy->base : (extra ? (QStyle*)extra->style : 0);
    QWidget *parent = q->parentWidget();
    QStyle *parentStyle = (parent && parent->d_func()->extra) ? (QStyle*)parent->d_func()->extra->style : 0;
    // If we have stylesheet on app or parent has stylesheet style, we need
    // to be running a proxy
    if (!qApp->styleSheet().isEmpty() || qobject_cast<QStyleSheetStyle *>(parentStyle)) {
        QStyle *newStyle = parentStyle;
        if (q->testAttribute(Qt::WA_SetStyle))
            newStyle = new QStyleSheetStyle(origStyle);
        else if (QStyleSheetStyle *newProxy = qobject_cast<QStyleSheetStyle *>(parentStyle))
            newProxy->ref();

        setStyle_helper(newStyle, true);
        return;
    }

    // So, we have no stylesheet on parent/app and we have an empty stylesheet
    // we just need our original style back
    if (origStyle == (extra ? (QStyle*)extra->style : 0)) // is it any different?
        return;

    // We could have inherited the proxy from our parent (which has a custom style)
    // In such a case we need to start following the application style (i.e revert
    // the propagation behavior of QStyleSheetStyle)
    if (!q->testAttribute(Qt::WA_SetStyle))
        origStyle = 0;

    setStyle_helper(origStyle, true);
#endif // QT_NO_STYLE_STYLESHEET
}

#ifdef QT3_SUPPORT

QStyle* QWidget::setStyle(const QString &style)
{
    QStyle *s = QStyleFactory::create(style);
    setStyle(s);
    return s;
}
#endif

Qt::WindowModality QWidget::windowModality() const
{
    return static_cast<Qt::WindowModality>(data->window_modality);
}

void QWidget::setWindowModality(Qt::WindowModality windowModality)
{
    data->window_modality = windowModality;
    // setModal_sys() will be called by setAttribute()
    setAttribute(Qt::WA_ShowModal, (data->window_modality != Qt::NonModal));
    setAttribute(Qt::WA_SetWindowModality, true);
}

bool QWidget::isMinimized() const
{ return data->window_state & Qt::WindowMinimized; }

void QWidget::showMinimized()
{
    bool isMin = isMinimized();
    if (isMin && isVisible())
        return;

    ensurePolished();
#ifdef QT3_SUPPORT
    if (parent())
        QApplication::sendPostedEvents(parent(), QEvent::ChildInserted);
#endif

    if (!isMin)
        setWindowState((windowState() & ~Qt::WindowActive) | Qt::WindowMinimized);
    show();
}

bool QWidget::isMaximized() const
{ return data->window_state & Qt::WindowMaximized; }



Qt::WindowStates QWidget::windowState() const
{
    return Qt::WindowStates(data->window_state);
}

void QWidget::overrideWindowState(Qt::WindowStates newstate)
{
    QWindowStateChangeEvent e(Qt::WindowStates(data->window_state), true);
    data->window_state  = newstate;
    QApplication::sendEvent(this, &e);
}

bool QWidget::isFullScreen() const
{ return data->window_state & Qt::WindowFullScreen; }

void QWidget::showFullScreen()
{
#ifdef Q_WS_MAC
    // If the unified toolbar is enabled, we have to disable it before going fullscreen.
    QMainWindow *mainWindow = qobject_cast<QMainWindow*>(this);
    if (mainWindow && mainWindow->unifiedTitleAndToolBarOnMac()) {
        mainWindow->setUnifiedTitleAndToolBarOnMac(false);
        QMainWindowLayout *mainLayout = qobject_cast<QMainWindowLayout*>(mainWindow->layout());
        mainLayout->activateUnifiedToolbarAfterFullScreen = true;
    }
#endif // Q_WS_MAC
    ensurePolished();
#ifdef QT3_SUPPORT
    if (parent())
        QApplication::sendPostedEvents(parent(), QEvent::ChildInserted);
#endif

    setWindowState((windowState() & ~(Qt::WindowMinimized | Qt::WindowMaximized))
                   | Qt::WindowFullScreen);
    show();
    activateWindow();
}

void QWidget::showMaximized()
{
    ensurePolished();
#ifdef QT3_SUPPORT
    if (parent())
        QApplication::sendPostedEvents(parent(), QEvent::ChildInserted);
#endif

    setWindowState((windowState() & ~(Qt::WindowMinimized | Qt::WindowFullScreen))
                   | Qt::WindowMaximized);
#ifdef Q_WS_MAC
    // If the unified toolbar was enabled before going fullscreen, we have to enable it back.
    QMainWindow *mainWindow = qobject_cast<QMainWindow*>(this);
    if (mainWindow)
    {
        QMainWindowLayout *mainLayout = qobject_cast<QMainWindowLayout*>(mainWindow->layout());
        if (mainLayout->activateUnifiedToolbarAfterFullScreen) {
            mainWindow->setUnifiedTitleAndToolBarOnMac(true);
            mainLayout->activateUnifiedToolbarAfterFullScreen = false;
        }
    }
#endif // Q_WS_MAC
    show();
}

void QWidget::showNormal()
{
    ensurePolished();
#ifdef QT3_SUPPORT
    if (parent())
        QApplication::sendPostedEvents(parent(), QEvent::ChildInserted);
#endif

    setWindowState(windowState() & ~(Qt::WindowMinimized
                                     | Qt::WindowMaximized
                                     | Qt::WindowFullScreen));
#ifdef Q_WS_MAC
    // If the unified toolbar was enabled before going fullscreen, we have to enable it back.
    QMainWindow *mainWindow = qobject_cast<QMainWindow*>(this);
    if (mainWindow)
    {
        QMainWindowLayout *mainLayout = qobject_cast<QMainWindowLayout*>(mainWindow->layout());
        if (mainLayout->activateUnifiedToolbarAfterFullScreen) {
            mainWindow->setUnifiedTitleAndToolBarOnMac(true);
            mainLayout->activateUnifiedToolbarAfterFullScreen = false;
        }
    }
#endif // Q_WS_MAC
    show();
}

bool QWidget::isEnabledTo(QWidget* ancestor) const
{
    const QWidget * w = this;
    while (!w->testAttribute(Qt::WA_ForceDisabled)
            && !w->isWindow()
            && w->parentWidget()
            && w->parentWidget() != ancestor)
        w = w->parentWidget();
    return !w->testAttribute(Qt::WA_ForceDisabled);
}

#ifndef QT_NO_ACTION

void QWidget::addAction(QAction *action)
{
    insertAction(0, action);
}

void QWidget::addActions(QList<QAction*> actions)
{
    for(int i = 0; i < actions.count(); i++)
        insertAction(0, actions.at(i));
}

void QWidget::insertAction(QAction *before, QAction *action)
{
    if(!action) {
        qWarning("QWidget::insertAction: Attempt to insert null action");
        return;
    }

    Q_D(QWidget);
    if(d->actions.contains(action))
        removeAction(action);

    int pos = d->actions.indexOf(before);
    if (pos < 0) {
        before = 0;
        pos = d->actions.size();
    }
    d->actions.insert(pos, action);

    QActionPrivate *apriv = action->d_func();
    apriv->widgets.append(this);

    QActionEvent e(QEvent::ActionAdded, action, before);
    QApplication::sendEvent(this, &e);
}

void QWidget::insertActions(QAction *before, QList<QAction*> actions)
{
    for(int i = 0; i < actions.count(); ++i)
        insertAction(before, actions.at(i));
}

void QWidget::removeAction(QAction *action)
{
    if (!action)
        return;

    Q_D(QWidget);

    QActionPrivate *apriv = action->d_func();
    apriv->widgets.removeAll(this);

    if (d->actions.removeAll(action)) {
        QActionEvent e(QEvent::ActionRemoved, action);
        QApplication::sendEvent(this, &e);
    }
}

QList<QAction*> QWidget::actions() const
{
    Q_D(const QWidget);
    return d->actions;
}
#endif // QT_NO_ACTION

void QWidget::setEnabled(bool enable)
{
    Q_D(QWidget);
    setAttribute(Qt::WA_ForceDisabled, !enable);
    d->setEnabled_helper(enable);
}

void QWidgetPrivate::setEnabled_helper(bool enable)
{
    Q_Q(QWidget);

    if (enable && !q->isWindow() && q->parentWidget() && !q->parentWidget()->isEnabled())
        return; // nothing we can do

    if (enable != q->testAttribute(Qt::WA_Disabled))
        return; // nothing to do

    q->setAttribute(Qt::WA_Disabled, !enable);
    updateSystemBackground();

    if (!enable && q->window()->focusWidget() == q) {
        bool parentIsEnabled = (!q->parentWidget() || q->parentWidget()->isEnabled());
        if (!parentIsEnabled || !q->focusNextChild())
            q->clearFocus();
    }

    Qt::WidgetAttribute attribute = enable ? Qt::WA_ForceDisabled : Qt::WA_Disabled;
    for (int i = 0; i < children.size(); ++i) {
        QWidget *w = qobject_cast<QWidget *>(children.at(i));
        if (w && !w->testAttribute(attribute))
            w->d_func()->setEnabled_helper(enable);
    }
#if defined(Q_WS_X11)
    if (q->testAttribute(Qt::WA_SetCursor) || q->isWindow()) {
        // enforce the windows behavior of clearing the cursor on
        // disabled widgets
        qt_x11_enforce_cursor(q);
    }
#endif
#if defined(Q_WS_MAC)
    setEnabled_helper_sys(enable);
#endif
#ifndef QT_NO_IM
    if (q->testAttribute(Qt::WA_InputMethodEnabled) && q->hasFocus()) {
        QWidget *focusWidget = effectiveFocusWidget();
        QInputContext *qic = focusWidget->d_func()->inputContext();
        if (enable) {
            if (focusWidget->testAttribute(Qt::WA_InputMethodEnabled))
                qic->setFocusWidget(focusWidget);
        } else {
            qic->reset();
            qic->setFocusWidget(0);
        }
    }
#endif //QT_NO_IM
    QEvent e(QEvent::EnabledChange);
    QApplication::sendEvent(q, &e);
#ifdef QT3_SUPPORT
    q->enabledChange(!enable); // compatibility
#endif
}

bool QWidget::acceptDrops() const
{
    return testAttribute(Qt::WA_AcceptDrops);
}

void QWidget::setAcceptDrops(bool on)
{
    setAttribute(Qt::WA_AcceptDrops, on);

}

void QWidget::setDisabled(bool disable)
{
    setEnabled(!disable);
}

QRect QWidget::frameGeometry() const
{
    Q_D(const QWidget);
    if (isWindow() && ! (windowType() == Qt::Popup)) {
        QRect fs = d->frameStrut();
        return QRect(data->crect.x() - fs.left(),
                     data->crect.y() - fs.top(),
                     data->crect.width() + fs.left() + fs.right(),
                     data->crect.height() + fs.top() + fs.bottom());
    }
    return data->crect;
}

int QWidget::x() const
{
    Q_D(const QWidget);
    if (isWindow() && ! (windowType() == Qt::Popup))
        return data->crect.x() - d->frameStrut().left();
    return data->crect.x();
}

int QWidget::y() const
{
    Q_D(const QWidget);
    if (isWindow() && ! (windowType() == Qt::Popup))
        return data->crect.y() - d->frameStrut().top();
    return data->crect.y();
}

QPoint QWidget::pos() const
{
    Q_D(const QWidget);
    if (isWindow() && ! (windowType() == Qt::Popup)) {
        QRect fs = d->frameStrut();
        return QPoint(data->crect.x() - fs.left(), data->crect.y() - fs.top());
    }
    return data->crect.topLeft();
}

QRect QWidget::normalGeometry() const
{
    Q_D(const QWidget);
    if (!d->extra || !d->extra->topextra)
        return QRect();

    if (!isMaximized() && !isFullScreen())
        return geometry();

    return d->topData()->normalGeometry;
}


QRect QWidget::childrenRect() const
{
    Q_D(const QWidget);
    QRect r(0, 0, 0, 0);
    for (int i = 0; i < d->children.size(); ++i) {
        QWidget *w = qobject_cast<QWidget *>(d->children.at(i));
        if (w && !w->isWindow() && !w->isHidden())
            r |= w->geometry();
    }
    return r;
}

QRegion QWidget::childrenRegion() const
{
    Q_D(const QWidget);
    QRegion r;
    for (int i = 0; i < d->children.size(); ++i) {
        QWidget *w = qobject_cast<QWidget *>(d->children.at(i));
        if (w && !w->isWindow() && !w->isHidden()) {
            QRegion mask = w->mask();
            if (mask.isEmpty())
                r |= w->geometry();
            else
                r |= mask.translated(w->pos());
        }
    }
    return r;
}


QSize QWidget::minimumSize() const
{
    Q_D(const QWidget);
    return d->extra ? QSize(d->extra->minw, d->extra->minh) : QSize(0, 0);
}

QSize QWidget::maximumSize() const
{
    Q_D(const QWidget);
    return d->extra ? QSize(d->extra->maxw, d->extra->maxh)
                 : QSize(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX);
}


QSize QWidget::sizeIncrement() const
{
    Q_D(const QWidget);
    return (d->extra && d->extra->topextra)
        ? QSize(d->extra->topextra->incw, d->extra->topextra->inch)
        : QSize(0, 0);
}

QSize QWidget::baseSize() const
{
    Q_D(const QWidget);
    return (d->extra != 0 && d->extra->topextra != 0)
        ? QSize(d->extra->topextra->basew, d->extra->topextra->baseh)
        : QSize(0, 0);
}

bool QWidgetPrivate::setMinimumSize_helper(int &minw, int &minh)
{
    Q_Q(QWidget);

#ifdef Q_WS_QWS
    if (q->isWindow()) {
        const QRect maxWindowRect = QApplication::desktop()->availableGeometry(QApplication::desktop()->screenNumber(q));
        if (!maxWindowRect.isEmpty()) {
            // ### This is really just a work-around. Layout shouldn't be
            // asking for minimum sizes bigger than the screen.
            if (minw > maxWindowRect.width())
                minw = maxWindowRect.width();
            if (minh > maxWindowRect.height())
                minh = maxWindowRect.height();
        }
    }
#endif
    int mw = minw, mh = minh;
    if (mw == QWIDGETSIZE_MAX)
        mw = 0;
    if (mh == QWIDGETSIZE_MAX)
        mh = 0;
    if (minw > QWIDGETSIZE_MAX || minh > QWIDGETSIZE_MAX) {
        qWarning("QWidget::setMinimumSize: (%s/%s) "
                "The largest allowed size is (%d,%d)",
                 q->objectName().toLocal8Bit().data(), q->metaObject()->className(), QWIDGETSIZE_MAX,
                QWIDGETSIZE_MAX);
        minw = mw = qMin<int>(minw, QWIDGETSIZE_MAX);
        minh = mh = qMin<int>(minh, QWIDGETSIZE_MAX);
    }
    if (minw < 0 || minh < 0) {
        qWarning("QWidget::setMinimumSize: (%s/%s) Negative sizes (%d,%d) "
                "are not possible",
                q->objectName().toLocal8Bit().data(), q->metaObject()->className(), minw, minh);
        minw = mw = qMax(minw, 0);
        minh = mh = qMax(minh, 0);
    }
    createExtra();
    if (extra->minw == mw && extra->minh == mh)
        return false;
    extra->minw = mw;
    extra->minh = mh;
    extra->explicitMinSize = (mw ? Qt::Horizontal : 0) | (mh ? Qt::Vertical : 0);
    return true;
}

void QWidget::setMinimumSize(int minw, int minh)
{
    Q_D(QWidget);
    if (!d->setMinimumSize_helper(minw, minh))
        return;

    if (isWindow())
        d->setConstraints_sys();
    if (minw > width() || minh > height()) {
        bool resized = testAttribute(Qt::WA_Resized);
        bool maximized = isMaximized();
        resize(qMax(minw,width()), qMax(minh,height()));
        setAttribute(Qt::WA_Resized, resized); //not a user resize
        if (maximized)
            data->window_state = data->window_state | Qt::WindowMaximized;
    }
#ifndef QT_NO_GRAPHICSVIEW
    if (d->extra) {
        if (d->extra->proxyWidget)
            d->extra->proxyWidget->setMinimumSize(minw, minh);
    }
#endif
    d->updateGeometry_helper(d->extra->minw == d->extra->maxw && d->extra->minh == d->extra->maxh);
}

bool QWidgetPrivate::setMaximumSize_helper(int &maxw, int &maxh)
{
    Q_Q(QWidget);
    if (maxw > QWIDGETSIZE_MAX || maxh > QWIDGETSIZE_MAX) {
        qWarning("QWidget::setMaximumSize: (%s/%s) "
                "The largest allowed size is (%d,%d)",
                 q->objectName().toLocal8Bit().data(), q->metaObject()->className(), QWIDGETSIZE_MAX,
                QWIDGETSIZE_MAX);
        maxw = qMin<int>(maxw, QWIDGETSIZE_MAX);
        maxh = qMin<int>(maxh, QWIDGETSIZE_MAX);
    }
    if (maxw < 0 || maxh < 0) {
        qWarning("QWidget::setMaximumSize: (%s/%s) Negative sizes (%d,%d) "
                "are not possible",
                q->objectName().toLocal8Bit().data(), q->metaObject()->className(), maxw, maxh);
        maxw = qMax(maxw, 0);
        maxh = qMax(maxh, 0);
    }
    createExtra();
    if (extra->maxw == maxw && extra->maxh == maxh)
        return false;
    extra->maxw = maxw;
    extra->maxh = maxh;
    extra->explicitMaxSize = (maxw != QWIDGETSIZE_MAX ? Qt::Horizontal : 0) |
                             (maxh != QWIDGETSIZE_MAX ? Qt::Vertical : 0);
    return true;
}

void QWidget::setMaximumSize(int maxw, int maxh)
{
    Q_D(QWidget);
    if (!d->setMaximumSize_helper(maxw, maxh))
        return;

    if (isWindow())
        d->setConstraints_sys();
    if (maxw < width() || maxh < height()) {
        bool resized = testAttribute(Qt::WA_Resized);
        resize(qMin(maxw,width()), qMin(maxh,height()));
        setAttribute(Qt::WA_Resized, resized); //not a user resize
    }

#ifndef QT_NO_GRAPHICSVIEW
    if (d->extra) {
        if (d->extra->proxyWidget)
            d->extra->proxyWidget->setMaximumSize(maxw, maxh);
    }
#endif

    d->updateGeometry_helper(d->extra->minw == d->extra->maxw && d->extra->minh == d->extra->maxh);
}

void QWidget::setSizeIncrement(int w, int h)
{
    Q_D(QWidget);
    d->createTLExtra();
    QTLWExtra* x = d->topData();
    if (x->incw == w && x->inch == h)
        return;
    x->incw = w;
    x->inch = h;
    if (isWindow())
        d->setConstraints_sys();
}

void QWidget::setBaseSize(int basew, int baseh)
{
    Q_D(QWidget);
    d->createTLExtra();
    QTLWExtra* x = d->topData();
    if (x->basew == basew && x->baseh == baseh)
        return;
    x->basew = basew;
    x->baseh = baseh;
    if (isWindow())
        d->setConstraints_sys();
}

void QWidget::setFixedSize(const QSize & s)
{
    setFixedSize(s.width(), s.height());
}


void QWidget::setFixedSize(int w, int h)
{
    Q_D(QWidget);
#ifdef Q_WS_QWS
    // temporary fix for 4.3.x.
    // Should move the embedded spesific contraints in setMinimumSize_helper into QLayout
    int tmpW = w;
    int tmpH = h;
    bool minSizeSet = d->setMinimumSize_helper(tmpW, tmpH);
#else
    bool minSizeSet = d->setMinimumSize_helper(w, h);
#endif
    bool maxSizeSet = d->setMaximumSize_helper(w, h);
    if (!minSizeSet && !maxSizeSet)
        return;

    if (isWindow())
        d->setConstraints_sys();
    else
        d->updateGeometry_helper(true);

    if (w != QWIDGETSIZE_MAX || h != QWIDGETSIZE_MAX)
        resize(w, h);
}

void QWidget::setMinimumWidth(int w)
{
    Q_D(QWidget);
    d->createExtra();
    uint expl = d->extra->explicitMinSize | (w ? Qt::Horizontal : 0);
    setMinimumSize(w, minimumSize().height());
    d->extra->explicitMinSize = expl;
}

void QWidget::setMinimumHeight(int h)
{
    Q_D(QWidget);
    d->createExtra();
    uint expl = d->extra->explicitMinSize | (h ? Qt::Vertical : 0);
    setMinimumSize(minimumSize().width(), h);
    d->extra->explicitMinSize = expl;
}

void QWidget::setMaximumWidth(int w)
{
    Q_D(QWidget);
    d->createExtra();
    uint expl = d->extra->explicitMaxSize | (w == QWIDGETSIZE_MAX ? 0 : Qt::Horizontal);
    setMaximumSize(w, maximumSize().height());
    d->extra->explicitMaxSize = expl;
}

void QWidget::setMaximumHeight(int h)
{
    Q_D(QWidget);
    d->createExtra();
    uint expl = d->extra->explicitMaxSize | (h == QWIDGETSIZE_MAX ? 0 : Qt::Vertical);
    setMaximumSize(maximumSize().width(), h);
    d->extra->explicitMaxSize = expl;
}

void QWidget::setFixedWidth(int w)
{
    Q_D(QWidget);
    d->createExtra();
    uint explMin = d->extra->explicitMinSize | Qt::Horizontal;
    uint explMax = d->extra->explicitMaxSize | Qt::Horizontal;
    setMinimumSize(w, minimumSize().height());
    setMaximumSize(w, maximumSize().height());
    d->extra->explicitMinSize = explMin;
    d->extra->explicitMaxSize = explMax;
}


void QWidget::setFixedHeight(int h)
{
    Q_D(QWidget);
    d->createExtra();
    uint explMin = d->extra->explicitMinSize | Qt::Vertical;
    uint explMax = d->extra->explicitMaxSize | Qt::Vertical;
    setMinimumSize(minimumSize().width(), h);
    setMaximumSize(maximumSize().width(), h);
    d->extra->explicitMinSize = explMin;
    d->extra->explicitMaxSize = explMax;
}


QPoint QWidget::mapTo(QWidget * parent, const QPoint & pos) const
{
    QPoint p = pos;
    if (parent) {
        const QWidget * w = this;
        while (w != parent) {
            Q_ASSERT_X(w, "QWidget::mapTo(QWidget *parent, const QPoint &pos)",
                       "parent must be in parent hierarchy");
            p = w->mapToParent(p);
            w = w->parentWidget();
        }
    }
    return p;
}


QPoint QWidget::mapFrom(QWidget * parent, const QPoint & pos) const
{
    QPoint p(pos);
    if (parent) {
        const QWidget * w = this;
        while (w != parent) {
            Q_ASSERT_X(w, "QWidget::mapFrom(QWidget *parent, const QPoint &pos)",
                       "parent must be in parent hierarchy");

            p = w->mapFromParent(p);
            w = w->parentWidget();
        }
    }
    return p;
}


QPoint QWidget::mapToParent(const QPoint &pos) const
{
    return pos + data->crect.topLeft();
}

QPoint QWidget::mapFromParent(const QPoint &pos) const
{
    return pos - data->crect.topLeft();
}


QWidget *QWidget::window() const
{
    QWidget *w = (QWidget *)this;
    QWidget *p = w->parentWidget();
    while (!w->isWindow() && p) {
        w = p;
        p = p->parentWidget();
    }
    return w;
}

QWidget *QWidget::nativeParentWidget() const
{
    QWidget *parent = parentWidget();
    while (parent && !parent->internalWinId())
        parent = parent->parentWidget();
    return parent;
}

#ifdef QT3_SUPPORT

Qt::BackgroundMode QWidget::backgroundMode() const
{
    if (testAttribute(Qt::WA_NoSystemBackground))
        return Qt::NoBackground;
    switch(backgroundRole()) {
    case QPalette::WindowText:
        return Qt::PaletteForeground;
    case QPalette::Button:
        return Qt::PaletteButton;
    case QPalette::Light:
        return Qt::PaletteLight;
    case QPalette::Midlight:
        return Qt::PaletteMidlight;
    case QPalette::Dark:
        return Qt::PaletteDark;
    case QPalette::Mid:
        return Qt::PaletteMid;
    case QPalette::Text:
        return Qt::PaletteText;
    case QPalette::BrightText:
        return Qt::PaletteBrightText;
    case QPalette::Base:
        return Qt::PaletteBase;
    case QPalette::Window:
        return Qt::PaletteBackground;
    case QPalette::Shadow:
        return Qt::PaletteShadow;
    case QPalette::Highlight:
        return Qt::PaletteHighlight;
    case QPalette::HighlightedText:
        return Qt::PaletteHighlightedText;
    case QPalette::ButtonText:
        return Qt::PaletteButtonText;
    case QPalette::Link:
        return Qt::PaletteLink;
    case QPalette::LinkVisited:
        return Qt::PaletteLinkVisited;
    default:
        break;
    }
    return Qt::NoBackground;
}

void QWidget::setBackgroundMode(Qt::BackgroundMode m, Qt::BackgroundMode)
{
    Q_D(QWidget);
    if(m == Qt::NoBackground) {
        setAttribute(Qt::WA_NoSystemBackground, true);
        return;
    }
    setAttribute(Qt::WA_NoSystemBackground, false);
    d->fg_role = QPalette::NoRole;
    QPalette::ColorRole role = d->bg_role;
    switch(m) {
    case Qt::FixedColor:
    case Qt::FixedPixmap:
        break;
    case Qt::PaletteForeground:
        role = QPalette::WindowText;
        break;
    case Qt::PaletteButton:
        role = QPalette::Button;
        break;
    case Qt::PaletteLight:
        role = QPalette::Light;
        break;
    case Qt::PaletteMidlight:
        role = QPalette::Midlight;
        break;
    case Qt::PaletteDark:
        role = QPalette::Dark;
        break;
    case Qt::PaletteMid:
        role = QPalette::Mid;
        break;
    case Qt::PaletteText:
        role = QPalette::Text;
        break;
    case Qt::PaletteBrightText:
        role = QPalette::BrightText;
        break;
    case Qt::PaletteBase:
        role = QPalette::Base;
        break;
    case Qt::PaletteBackground:
        role = QPalette::Window;
        break;
    case Qt::PaletteShadow:
        role = QPalette::Shadow;
        break;
    case Qt::PaletteHighlight:
        role = QPalette::Highlight;
        break;
    case Qt::PaletteHighlightedText:
        role = QPalette::HighlightedText;
        break;
    case Qt::PaletteButtonText:
        role = QPalette::ButtonText;
        break;
    case Qt::PaletteLink:
        role = QPalette::Link;
        break;
    case Qt::PaletteLinkVisited:
        role = QPalette::LinkVisited;
        break;
    case Qt::X11ParentRelative:
        d->fg_role = role = QPalette::NoRole;
    default:
        break;
    }
    setBackgroundRole(role);
}

QT3_SUPPORT QWidgetMapper *QWidget::wmapper() { return QWidgetPrivate::mapper; }

#endif


QPalette::ColorRole QWidget::backgroundRole() const
{

    const QWidget *w = this;
    do {
        QPalette::ColorRole role = w->d_func()->bg_role;
        if (role != QPalette::NoRole)
            return role;
        if (w->isWindow() || w->windowType() == Qt::SubWindow)
            break;
        w = w->parentWidget();
    } while (w);
    return QPalette::Window;
}

void QWidget::setBackgroundRole(QPalette::ColorRole role)
{
    Q_D(QWidget);
    d->bg_role = role;
    d->updateSystemBackground();
    d->propagatePaletteChange();
    d->updateIsOpaque();
}

QPalette::ColorRole QWidget::foregroundRole() const
{
    Q_D(const QWidget);
    QPalette::ColorRole rl = QPalette::ColorRole(d->fg_role);
    if (rl != QPalette::NoRole)
        return rl;
    QPalette::ColorRole role = QPalette::WindowText;
    switch (backgroundRole()) {
    case QPalette::Button:
        role = QPalette::ButtonText;
        break;
    case QPalette::Base:
        role = QPalette::Text;
        break;
    case QPalette::Dark:
    case QPalette::Shadow:
        role = QPalette::Light;
        break;
    case QPalette::Highlight:
        role = QPalette::HighlightedText;
        break;
    case QPalette::ToolTipBase:
        role = QPalette::ToolTipText;
        break;
    default:
        ;
    }
    return role;
}

void QWidget::setForegroundRole(QPalette::ColorRole role)
{
    Q_D(QWidget);
    d->fg_role = role;
    d->updateSystemBackground();
    d->propagatePaletteChange();
}

const QPalette &QWidget::palette() const
{
    if (!isEnabled()) {
        data->pal.setCurrentColorGroup(QPalette::Disabled);
    } else if ((!isVisible() || isActiveWindow())
#if defined(Q_OS_WIN) && !defined(Q_WS_WINCE)
        && !QApplicationPrivate::isBlockedByModal(const_cast<QWidget *>(this))
#endif
        ) {
        data->pal.setCurrentColorGroup(QPalette::Active);
    } else {
#ifdef Q_WS_MAC
        extern bool qt_mac_can_clickThrough(const QWidget *); //qwidget_mac.cpp
        if (qt_mac_can_clickThrough(this))
            data->pal.setCurrentColorGroup(QPalette::Active);
        else
#endif
            data->pal.setCurrentColorGroup(QPalette::Inactive);
    }
    return data->pal;
}

void QWidget::setPalette(const QPalette &palette)
{
    Q_D(QWidget);
    setAttribute(Qt::WA_SetPalette, palette.resolve() != 0);

    // Determine which palette is inherited from this widget's ancestors and
    // QApplication::palette, resolve this against \a palette (attributes from
    // the inherited palette are copied over this widget's palette). Then
    // propagate this palette to this widget's children.
    QPalette naturalPalette = d->naturalWidgetPalette(d->inheritedPaletteResolveMask);
    QPalette resolvedPalette = palette.resolve(naturalPalette);
    d->setPalette_helper(resolvedPalette);
}

QPalette QWidgetPrivate::naturalWidgetPalette(uint inheritedMask) const
{
    Q_Q(const QWidget);
    QPalette naturalPalette = QApplication::palette(q);
    if (!q->testAttribute(Qt::WA_StyleSheet)
        && (!q->isWindow() || q->testAttribute(Qt::WA_WindowPropagation)
#ifndef QT_NO_GRAPHICSVIEW
            || (extra && extra->proxyWidget)
#endif //QT_NO_GRAPHICSVIEW
            )) {
        if (QWidget *p = q->parentWidget()) {
            if (!p->testAttribute(Qt::WA_StyleSheet)) {
                if (!naturalPalette.isCopyOf(QApplication::palette())) {
                    QPalette inheritedPalette = p->palette();
                    inheritedPalette.resolve(inheritedMask);
                    naturalPalette = inheritedPalette.resolve(naturalPalette);
                } else {
                    naturalPalette = p->palette();
                }
            }
        }
#ifndef QT_NO_GRAPHICSVIEW
        else if (extra && extra->proxyWidget) {
            QPalette inheritedPalette = extra->proxyWidget->palette();
            inheritedPalette.resolve(inheritedMask);
            naturalPalette = inheritedPalette.resolve(naturalPalette);
        }
#endif //QT_NO_GRAPHICSVIEW
    }
    naturalPalette.resolve(0);
    return naturalPalette;
}
void QWidgetPrivate::resolvePalette()
{
    QPalette naturalPalette = naturalWidgetPalette(inheritedPaletteResolveMask);
    QPalette resolvedPalette = data.pal.resolve(naturalPalette);
    setPalette_helper(resolvedPalette);
}

void QWidgetPrivate::setPalette_helper(const QPalette &palette)
{
    Q_Q(QWidget);
    if (data.pal == palette && data.pal.resolve() == palette.resolve())
        return;
    data.pal = palette;
    updateSystemBackground();
    propagatePaletteChange();
    updateIsOpaque();
    q->update();
    updateIsOpaque();
}

void QWidget::setFont(const QFont &font)
{
    Q_D(QWidget);

#ifndef QT_NO_STYLE_STYLESHEET
    const QStyleSheetStyle* style;
    if (d->extra && (style = qobject_cast<const QStyleSheetStyle*>(d->extra->style))) {
        style->saveWidgetFont(this, font);
    }
#endif

    setAttribute(Qt::WA_SetFont, font.resolve() != 0);

    // Determine which font is inherited from this widget's ancestors and
    // QApplication::font, resolve this against \a font (attributes from the
    // inherited font are copied over). Then propagate this font to this
    // widget's children.
    QFont naturalFont = d->naturalWidgetFont(d->inheritedFontResolveMask);
    QFont resolvedFont = font.resolve(naturalFont);
    d->setFont_helper(resolvedFont);
}

/*
    \internal

    Returns the font that the widget \a w inherits from its ancestors and
    QApplication::font. \a inheritedMask is the combination of the widget's
    ancestors font request masks (i.e., which attributes from the parent
    widget's font are implicitly imposed on this widget by the user). Note
    that this font does not take into account the font set on \a w itself.

    ### Stylesheet has a different font propagation mechanism. When a stylesheet
        is applied, fonts are not propagated anymore
*/
QFont QWidgetPrivate::naturalWidgetFont(uint inheritedMask) const
{
    Q_Q(const QWidget);
    QFont naturalFont = QApplication::font(q);
    if (!q->testAttribute(Qt::WA_StyleSheet)
        && (!q->isWindow() || q->testAttribute(Qt::WA_WindowPropagation)
#ifndef QT_NO_GRAPHICSVIEW
            || (extra && extra->proxyWidget)
#endif //QT_NO_GRAPHICSVIEW
            )) {
        if (QWidget *p = q->parentWidget()) {
            if (!p->testAttribute(Qt::WA_StyleSheet)) {
                if (!naturalFont.isCopyOf(QApplication::font())) {
                    QFont inheritedFont = p->font();
                    inheritedFont.resolve(inheritedMask);
                    naturalFont = inheritedFont.resolve(naturalFont);
                } else {
                    naturalFont = p->font();
                }
            }
        }
#ifndef QT_NO_GRAPHICSVIEW
        else if (extra && extra->proxyWidget) {
            QFont inheritedFont = extra->proxyWidget->font();
            inheritedFont.resolve(inheritedMask);
            naturalFont = inheritedFont.resolve(naturalFont);
        }
#endif //QT_NO_GRAPHICSVIEW
    }
    naturalFont.resolve(0);
    return naturalFont;
}

void QWidgetPrivate::resolveFont()
{
    QFont naturalFont = naturalWidgetFont(inheritedFontResolveMask);
    QFont resolvedFont = data.fnt.resolve(naturalFont);
    setFont_helper(resolvedFont);
}

void QWidgetPrivate::updateFont(const QFont &font)
{
    Q_Q(QWidget);
#ifndef QT_NO_STYLE_STYLESHEET
    const QStyleSheetStyle* cssStyle;
    cssStyle = extra ? qobject_cast<const QStyleSheetStyle*>(extra->style) : 0;
#endif

#ifdef QT3_SUPPORT
    QFont old = data.fnt;
#endif
    data.fnt = QFont(font, q);
#if defined(Q_WS_X11)
    // make sure the font set on this widget is associated with the correct screen
    data.fnt.x11SetScreen(xinfo.screen());
#endif
    // Combine new mask with natural mask and propagate to children.
#ifndef QT_NO_GRAPHICSVIEW
    if (!q->parentWidget() && extra && extra->proxyWidget) {
        QGraphicsProxyWidget *p = extra->proxyWidget;
        inheritedFontResolveMask = p->d_func()->inheritedFontResolveMask | p->font().resolve();
    } else
#endif //QT_NO_GRAPHICSVIEW
    if (q->isWindow() && !q->testAttribute(Qt::WA_WindowPropagation)) {
        inheritedFontResolveMask = 0;
    }
    uint newMask = data.fnt.resolve() | inheritedFontResolveMask;

    for (int i = 0; i < children.size(); ++i) {
        QWidget *w = qobject_cast<QWidget*>(children.at(i));
        if (w) {
            if (0) {
#ifndef QT_NO_STYLE_STYLESHEET
            } else if (w->testAttribute(Qt::WA_StyleSheet)) {
                // Style sheets follow a different font propagation scheme.
                if (cssStyle)
                    cssStyle->updateStyleSheetFont(w);
#endif
            } else if ((!w->isWindow() || w->testAttribute(Qt::WA_WindowPropagation))) {
                // Propagate font changes.
                QWidgetPrivate *wd = w->d_func();
                wd->inheritedFontResolveMask = newMask;
                wd->resolveFont();
            }
        }
    }

#ifndef QT_NO_STYLE_STYLESHEET
    if (cssStyle) {
        cssStyle->updateStyleSheetFont(q);
    }
#endif

    QEvent e(QEvent::FontChange);
    QApplication::sendEvent(q, &e);
#ifdef QT3_SUPPORT
    q->fontChange(old);
#endif
}

void QWidgetPrivate::setLayoutDirection_helper(Qt::LayoutDirection direction)
{
    Q_Q(QWidget);

    if ( (direction == Qt::RightToLeft) == q->testAttribute(Qt::WA_RightToLeft))
        return;
    q->setAttribute(Qt::WA_RightToLeft, (direction == Qt::RightToLeft));
    if (!children.isEmpty()) {
        for (int i = 0; i < children.size(); ++i) {
            QWidget *w = qobject_cast<QWidget*>(children.at(i));
            if (w && !w->isWindow() && !w->testAttribute(Qt::WA_SetLayoutDirection))
                w->d_func()->setLayoutDirection_helper(direction);
        }
    }
    QEvent e(QEvent::LayoutDirectionChange);
    QApplication::sendEvent(q, &e);
}

void QWidgetPrivate::resolveLayoutDirection()
{
    Q_Q(const QWidget);
    if (!q->testAttribute(Qt::WA_SetLayoutDirection))
        setLayoutDirection_helper(q->isWindow() ? QApplication::layoutDirection() : q->parentWidget()->layoutDirection());
}

void QWidget::setLayoutDirection(Qt::LayoutDirection direction)
{
    Q_D(QWidget);

    if (direction == Qt::LayoutDirectionAuto) {
        unsetLayoutDirection();
        return;
    }

    setAttribute(Qt::WA_SetLayoutDirection);
    d->setLayoutDirection_helper(direction);
}

Qt::LayoutDirection QWidget::layoutDirection() const
{
    return testAttribute(Qt::WA_RightToLeft) ? Qt::RightToLeft : Qt::LeftToRight;
}

void QWidget::unsetLayoutDirection()
{
    Q_D(QWidget);
    setAttribute(Qt::WA_SetLayoutDirection, false);
    d->resolveLayoutDirection();
}

#ifndef QT_NO_CURSOR
QCursor QWidget::cursor() const
{
    Q_D(const QWidget);
    if (testAttribute(Qt::WA_SetCursor))
        return (d->extra && d->extra->curs)
            ? *d->extra->curs
            : QCursor(Qt::ArrowCursor);
    if (isWindow() || !parentWidget())
        return QCursor(Qt::ArrowCursor);
    return parentWidget()->cursor();
}

void QWidget::setCursor(const QCursor &cursor)
{
    Q_D(QWidget);
// On Mac we must set the cursor even if it is the ArrowCursor.
#if !defined(Q_WS_MAC) && !defined(Q_WS_QWS)
    if (cursor.shape() != Qt::ArrowCursor
        || (d->extra && d->extra->curs))
#endif
    {
        d->createExtra();
        QCursor *newCursor = new QCursor(cursor);
        delete d->extra->curs;
        d->extra->curs = newCursor;
    }
    setAttribute(Qt::WA_SetCursor);
    d->setCursor_sys(cursor);

    QEvent event(QEvent::CursorChange);
    QApplication::sendEvent(this, &event);
}

void QWidget::unsetCursor()
{
    Q_D(QWidget);
    if (d->extra) {
        delete d->extra->curs;
        d->extra->curs = 0;
    }
    if (!isWindow())
        setAttribute(Qt::WA_SetCursor, false);
    d->unsetCursor_sys();

    QEvent event(QEvent::CursorChange);
    QApplication::sendEvent(this, &event);
}

#endif

void QWidget::render(QPaintDevice *target, const QPoint &targetOffset,
                     const QRegion &sourceRegion, RenderFlags renderFlags)
{
    d_func()->render(target, targetOffset, sourceRegion, renderFlags, false);
}

void QWidget::render(QPainter *painter, const QPoint &targetOffset,
                     const QRegion &sourceRegion, RenderFlags renderFlags)
{
    if (!painter) {
        qWarning("QWidget::render: Null pointer to painter");
        return;
    }

    if (!painter->isActive()) {
        qWarning("QWidget::render: Cannot render with an inactive painter");
        return;
    }

    const qreal opacity = painter->opacity();
    if (qFuzzyIsNull(opacity))
        return; // Fully transparent.

    Q_D(QWidget);
    const bool inRenderWithPainter = d->extra && d->extra->inRenderWithPainter;
    const QRegion toBePainted = !inRenderWithPainter ? d->prepareToRender(sourceRegion, renderFlags)
                                                     : sourceRegion;
    if (toBePainted.isEmpty())
        return;

    if (!d->extra)
        d->createExtra();
    d->extra->inRenderWithPainter = true;

#ifdef Q_WS_MAC
    d->render_helper(painter, targetOffset, toBePainted, renderFlags);
#else
    QPaintEngine *engine = painter->paintEngine();
    Q_ASSERT(engine);
    QPaintEnginePrivate *enginePriv = engine->d_func();
    Q_ASSERT(enginePriv);
    QPaintDevice *target = engine->paintDevice();
    Q_ASSERT(target);

    // Render via a pixmap when dealing with non-opaque painters or printers.
    if (!inRenderWithPainter && (opacity < 1.0 || (target->devType() == QInternal::Printer))) {
        d->render_helper(painter, targetOffset, toBePainted, renderFlags);
        d->extra->inRenderWithPainter = false;
        return;
    }

    // Set new shared painter.
    QPainter *oldPainter = d->sharedPainter();
    d->setSharedPainter(painter);

    // Save current system clip, viewport and transform,
    const QTransform oldTransform = enginePriv->systemTransform;
    const QRegion oldSystemClip = enginePriv->systemClip;
    const QRegion oldSystemViewport = enginePriv->systemViewport;

    // This ensures that all painting triggered by render() is clipped to the current engine clip.
    if (painter->hasClipping()) {
        const QRegion painterClip = painter->deviceTransform().map(painter->clipRegion());
        enginePriv->setSystemViewport(oldSystemClip.isEmpty() ? painterClip : oldSystemClip & painterClip);
    } else {
        enginePriv->setSystemViewport(oldSystemClip);
    }

    render(target, targetOffset, toBePainted, renderFlags);

    // Restore system clip, viewport and transform.
    enginePriv->systemClip = oldSystemClip;
    enginePriv->setSystemViewport(oldSystemViewport);
    enginePriv->setSystemTransform(oldTransform);

    // Restore shared painter.
    d->setSharedPainter(oldPainter);
#endif

    d->extra->inRenderWithPainter = false;
}

#ifndef QT_NO_GRAPHICSEFFECT
QGraphicsEffect *QWidget::graphicsEffect() const
{
    Q_D(const QWidget);
    return d->graphicsEffect;
}
#endif //QT_NO_GRAPHICSEFFECT

#ifndef QT_NO_GRAPHICSEFFECT
void QWidget::setGraphicsEffect(QGraphicsEffect *effect)
{
    Q_D(QWidget);
    if (d->graphicsEffect == effect)
        return;

    if (d->graphicsEffect) {
        d->invalidateBuffer(rect());
        delete d->graphicsEffect;
        d->graphicsEffect = 0;
    }

    if (effect) {
        // Set new effect.
        QGraphicsEffectSourcePrivate *sourced = new QWidgetEffectSourcePrivate(this);
        QGraphicsEffectSource *source = new QGraphicsEffectSource(*sourced);
        d->graphicsEffect = effect;
        effect->d_func()->setGraphicsEffectSource(source);
        update();
    }

    d->updateIsOpaque();
}
#endif //QT_NO_GRAPHICSEFFECT

bool QWidgetPrivate::isAboutToShow() const
{
    if (data.in_show)
        return true;

    Q_Q(const QWidget);
    if (q->isHidden())
        return false;

    // The widget will be shown if any of its ancestors are about to show.
    QWidget *parent = q->parentWidget();
    return parent ? parent->d_func()->isAboutToShow() : false;
}

QRegion QWidgetPrivate::prepareToRender(const QRegion &region, QWidget::RenderFlags renderFlags)
{
    Q_Q(QWidget);
    const bool isVisible = q->isVisible();

    // Make sure the widget is laid out correctly.
    if (!isVisible && !isAboutToShow()) {
        QWidget *topLevel = q->window();
        (void)topLevel->d_func()->topData(); // Make sure we at least have top-data.
        topLevel->ensurePolished();

        // Invalidate the layout of hidden ancestors (incl. myself) and pretend
        // they're not explicitly hidden.
        QWidget *widget = q;
        QWidgetList hiddenWidgets;
        while (widget) {
            if (widget->isHidden()) {
                widget->setAttribute(Qt::WA_WState_Hidden, false);
                hiddenWidgets.append(widget);
                if (!widget->isWindow() && widget->parentWidget()->d_func()->layout)
                    widget->d_func()->updateGeometry_helper(true);
            }
            widget = widget->parentWidget();
        }

        // Activate top-level layout.
        if (topLevel->d_func()->layout)
            topLevel->d_func()->layout->activate();

        // Adjust size if necessary.
        QTLWExtra *topLevelExtra = topLevel->d_func()->maybeTopData();
        if (topLevelExtra && !topLevelExtra->sizeAdjusted
            && !topLevel->testAttribute(Qt::WA_Resized)) {
            topLevel->adjustSize();
            topLevel->setAttribute(Qt::WA_Resized, false);
        }

        // Activate child layouts.
        topLevel->d_func()->activateChildLayoutsRecursively();

        // We're not cheating with WA_WState_Hidden anymore.
        for (int i = 0; i < hiddenWidgets.size(); ++i) {
            QWidget *widget = hiddenWidgets.at(i);
            widget->setAttribute(Qt::WA_WState_Hidden);
            if (!widget->isWindow() && widget->parentWidget()->d_func()->layout)
                widget->parentWidget()->d_func()->layout->invalidate();
        }
    } else if (isVisible) {
        q->window()->d_func()->sendPendingMoveAndResizeEvents(true, true);
    }

    // Calculate the region to be painted.
    QRegion toBePainted = !region.isEmpty() ? region : QRegion(q->rect());
    if (!(renderFlags & QWidget::IgnoreMask) && extra && extra->hasMask)
        toBePainted &= extra->mask;
    return toBePainted;
}

void QWidgetPrivate::render_helper(QPainter *painter, const QPoint &targetOffset, const QRegion &toBePainted,
                                   QWidget::RenderFlags renderFlags)
{
    Q_ASSERT(painter);
    Q_ASSERT(!toBePainted.isEmpty());

    Q_Q(QWidget);
#ifndef Q_WS_MAC
    const QTransform originalTransform = painter->worldTransform();
    const bool useDeviceCoordinates = originalTransform.isScaling();
    if (!useDeviceCoordinates) {
#endif
        // Render via a pixmap.
        const QRect rect = toBePainted.boundingRect();
        const QSize size = rect.size();
        if (size.isNull())
            return;

        QPixmap pixmap(size);
        if (!(renderFlags & QWidget::DrawWindowBackground) || !isOpaque)
            pixmap.fill(Qt::transparent);
        q->render(&pixmap, QPoint(), toBePainted, renderFlags);

        const bool restore = !(painter->renderHints() & QPainter::SmoothPixmapTransform);
        painter->setRenderHints(QPainter::SmoothPixmapTransform, true);

        painter->drawPixmap(targetOffset, pixmap);

        if (restore)
            painter->setRenderHints(QPainter::SmoothPixmapTransform, false);

#ifndef Q_WS_MAC
    } else {
        // Render via a pixmap in device coordinates (to avoid pixmap scaling).
        QTransform transform = originalTransform;
        transform.translate(targetOffset.x(), targetOffset.y());

        QPaintDevice *device = painter->device();
        Q_ASSERT(device);

        // Calculate device rect.
        const QRectF rect(toBePainted.boundingRect());
        QRect deviceRect = transform.mapRect(QRectF(0, 0, rect.width(), rect.height())).toAlignedRect();
        deviceRect &= QRect(0, 0, device->width(), device->height());

        QPixmap pixmap(deviceRect.size());
        pixmap.fill(Qt::transparent);

        // Create a pixmap device coordinate painter.
        QPainter pixmapPainter(&pixmap);
        pixmapPainter.setRenderHints(painter->renderHints());
        transform *= QTransform::fromTranslate(-deviceRect.x(), -deviceRect.y());
        pixmapPainter.setTransform(transform);

        q->render(&pixmapPainter, QPoint(), toBePainted, renderFlags);
        pixmapPainter.end();

        // And then draw the pixmap.
        painter->setTransform(QTransform());
        painter->drawPixmap(deviceRect.topLeft(), pixmap);
        painter->setTransform(originalTransform);
    }
#endif
}

void QWidgetPrivate::drawWidget(QPaintDevice *pdev, const QRegion &rgn, const QPoint &offset, int flags,
                                QPainter *sharedPainter, QWidgetBackingStore *backingStore)
{
    if (rgn.isEmpty())
        return;

#if defined(Q_WS_MAC) && defined(QT_MAC_USE_COCOA)
    if (qt_mac_clearDirtyOnWidgetInsideDrawWidget)
        dirtyOnWidget = QRegion();

    // We disable the rendering of QToolBar in the backingStore if
    // it's supposed to be in the unified toolbar on Mac OS X.
    if (backingStore && isInUnifiedToolbar)
        return;
#endif // Q_WS_MAC && QT_MAC_USE_COCOA


    Q_Q(QWidget);
#if !defined(QT_NO_GRAPHICSEFFECT) && !defined(Q_WS_MAC)
    if (graphicsEffect && graphicsEffect->isEnabled()) {
        QGraphicsEffectSource *source = graphicsEffect->d_func()->source;
        QWidgetEffectSourcePrivate *sourced = static_cast<QWidgetEffectSourcePrivate *>
                                                         (source->d_func());
        if (!sourced->context) {
            QWidgetPaintContext context(pdev, rgn, offset, flags, sharedPainter, backingStore);
            sourced->context = &context;
            if (!sharedPainter) {
                QPaintEngine *paintEngine = pdev->paintEngine();
                paintEngine->d_func()->systemClip = rgn.translated(offset);
                QPainter p(pdev);
                p.translate(offset);
                context.painter = &p;
                graphicsEffect->draw(&p);
                paintEngine->d_func()->systemClip = QRegion();
            } else {
                context.painter = sharedPainter;
                if (sharedPainter->worldTransform() != sourced->lastEffectTransform) {
                    sourced->invalidateCache();
                    sourced->lastEffectTransform = sharedPainter->worldTransform();
                }
                sharedPainter->save();
                sharedPainter->translate(offset);
                graphicsEffect->draw(sharedPainter);
                sharedPainter->restore();
            }
            sourced->context = 0;
            return;
        }
    }
#endif //QT_NO_GRAFFICSEFFECT

    const bool asRoot = flags & DrawAsRoot;
    const bool alsoOnScreen = flags & DrawPaintOnScreen;
    const bool recursive = flags & DrawRecursive;
    const bool alsoInvisible = flags & DrawInvisible;

    Q_ASSERT(sharedPainter ? sharedPainter->isActive() : true);

    QRegion toBePainted(rgn);
    if (asRoot && !alsoInvisible)
        toBePainted &= clipRect(); //(rgn & visibleRegion());
    if (!(flags & DontSubtractOpaqueChildren))
        subtractOpaqueChildren(toBePainted, q->rect());

    if (!toBePainted.isEmpty()) {
        bool onScreen = paintOnScreen();
        if (!onScreen || alsoOnScreen) {
            //update the "in paint event" flag
            if (q->testAttribute(Qt::WA_WState_InPaintEvent))
                qWarning("QWidget::repaint: Recursive repaint detected");
            q->setAttribute(Qt::WA_WState_InPaintEvent);

            //clip away the new area
#ifndef QT_NO_PAINT_DEBUG
            bool flushed = QWidgetBackingStore::flushPaint(q, toBePainted);
#endif
            QPaintEngine *paintEngine = pdev->paintEngine();
            if (paintEngine) {
                setRedirected(pdev, -offset);

#ifdef Q_WS_MAC
                // (Alien support) Special case for Mac when redirecting: If the paint device
                // is of the Widget type we need to set WA_WState_InPaintEvent since painting
                // outside the paint event is not supported on QWidgets. The attributeis
                // restored further down.
                if (pdev->devType() == QInternal::Widget)
                    static_cast<QWidget *>(pdev)->setAttribute(Qt::WA_WState_InPaintEvent);

#endif
                if (sharedPainter)
                    paintEngine->d_func()->systemClip = toBePainted;
                else
                    paintEngine->d_func()->systemRect = q->data->crect;

                //paint the background
                if ((asRoot || q->autoFillBackground() || onScreen || q->testAttribute(Qt::WA_StyledBackground))
                    && !q->testAttribute(Qt::WA_OpaquePaintEvent) && !q->testAttribute(Qt::WA_NoSystemBackground)) {
                    QPainter p(q);
                    paintBackground(&p, toBePainted, (asRoot || onScreen) ? flags | DrawAsRoot : 0);
                }

                if (!sharedPainter)
                    paintEngine->d_func()->systemClip = toBePainted.translated(offset);

                if (!onScreen && !asRoot && !isOpaque && q->testAttribute(Qt::WA_TintedBackground)) {
                    QPainter p(q);
                    QColor tint = q->palette().window().color();
                    tint.setAlphaF(qreal(.6));
                    p.fillRect(toBePainted.boundingRect(), tint);
                }
            }

#if 0
            qDebug() << "painting" << q << "opaque ==" << isOpaque();
            qDebug() << "clipping to" << toBePainted << "location == " << offset
                     << "geometry ==" << QRect(q->mapTo(q->window(), QPoint(0, 0)), q->size());
#endif

            //actually send the paint event
            QPaintEvent e(toBePainted);
            QCoreApplication::sendSpontaneousEvent(q, &e);
#if !defined(Q_WS_QWS) && !defined(Q_WS_QPA)
            if (backingStore && !onScreen && !asRoot && (q->internalWinId() || !q->nativeParentWidget()->isWindow()))
                backingStore->markDirtyOnScreen(toBePainted, q, offset);
#endif

            //restore
            if (paintEngine) {
#ifdef Q_WS_MAC
                if (pdev->devType() == QInternal::Widget)
                    static_cast<QWidget *>(pdev)->setAttribute(Qt::WA_WState_InPaintEvent, false);
#endif
                restoreRedirected();
                if (!sharedPainter)
                    paintEngine->d_func()->systemRect = QRect();
                else
                    paintEngine->d_func()->currentClipWidget = 0;
                paintEngine->d_func()->systemClip = QRegion();
            }
            q->setAttribute(Qt::WA_WState_InPaintEvent, false);
            if (q->paintingActive() && !q->testAttribute(Qt::WA_PaintOutsidePaintEvent))
                qWarning("QWidget::repaint: It is dangerous to leave painters active on a widget outside of the PaintEvent");

            if (paintEngine && paintEngine->autoDestruct()) {
                delete paintEngine;
            }

#ifndef QT_NO_PAINT_DEBUG
            if (flushed)
                QWidgetBackingStore::unflushPaint(q, toBePainted);
#endif
        } else if (q->isWindow()) {
            QPaintEngine *engine = pdev->paintEngine();
            if (engine) {
                QPainter p(pdev);
                p.setClipRegion(toBePainted);
                const QBrush bg = q->palette().brush(QPalette::Window);
                if (bg.style() == Qt::TexturePattern)
                    p.drawTiledPixmap(q->rect(), bg.texture());
                else
                    p.fillRect(q->rect(), bg);

                if (engine->autoDestruct())
                    delete engine;
            }
        }
    }

    if (recursive && !children.isEmpty()) {
        paintSiblingsRecursive(pdev, children, children.size() - 1, rgn, offset, flags & ~DrawAsRoot
#ifdef Q_BACKINGSTORE_SUBSURFACES
                                , q->windowSurface()
#endif
                                , sharedPainter, backingStore);
    }
}

void QWidgetPrivate::render(QPaintDevice *target, const QPoint &targetOffset,
                            const QRegion &sourceRegion, QWidget::RenderFlags renderFlags,
                            bool readyToRender)
{
    if (!target) {
        qWarning("QWidget::render: null pointer to paint device");
        return;
    }

    const bool inRenderWithPainter = extra && extra->inRenderWithPainter;
    QRegion paintRegion = !inRenderWithPainter && !readyToRender
                          ? prepareToRender(sourceRegion, renderFlags)
                          : sourceRegion;
    if (paintRegion.isEmpty())
        return;

#ifndef Q_WS_MAC
    QPainter *oldSharedPainter = inRenderWithPainter ? sharedPainter() : 0;

    // Use the target's shared painter if set (typically set when doing
    // "other->render(widget);" in the widget's paintEvent.
    if (target->devType() == QInternal::Widget) {
        QWidgetPrivate *targetPrivate = static_cast<QWidget *>(target)->d_func();
        if (targetPrivate->extra && targetPrivate->extra->inRenderWithPainter) {
            QPainter *targetPainter = targetPrivate->sharedPainter();
            if (targetPainter && targetPainter->isActive())
                setSharedPainter(targetPainter);
        }
    }
#endif

    // Use the target's redirected device if set and adjust offset and paint
    // region accordingly. This is typically the case when people call render
    // from the paintEvent.
    QPoint offset = targetOffset;
    offset -= paintRegion.boundingRect().topLeft();
    QPoint redirectionOffset;
    QPaintDevice *redirected = 0;

    if (target->devType() == QInternal::Widget)
        redirected = static_cast<QWidget *>(target)->d_func()->redirected(&redirectionOffset);
    if (!redirected)
        redirected = QPainter::redirected(target, &redirectionOffset);

    if (redirected) {
        target = redirected;
        offset -= redirectionOffset;
    }

    if (!inRenderWithPainter) { // Clip handled by shared painter (in qpainter.cpp).
        if (QPaintEngine *targetEngine = target->paintEngine()) {
            const QRegion targetSystemClip = targetEngine->systemClip();
            if (!targetSystemClip.isEmpty())
                paintRegion &= targetSystemClip.translated(-offset);
        }
    }

    // Set backingstore flags.
    int flags = DrawPaintOnScreen | DrawInvisible;
    if (renderFlags & QWidget::DrawWindowBackground)
        flags |= DrawAsRoot;

    if (renderFlags & QWidget::DrawChildren)
        flags |= DrawRecursive;
    else
        flags |= DontSubtractOpaqueChildren;

#if defined(Q_WS_QWS) || defined(Q_WS_QPA)
    flags |= DontSetCompositionMode;
#endif

    if (target->devType() == QInternal::Printer) {
        QPainter p(target);
        render_helper(&p, targetOffset, paintRegion, renderFlags);
        return;
    }

#ifndef Q_WS_MAC
    // Render via backingstore.
    drawWidget(target, paintRegion, offset, flags, sharedPainter());

    // Restore shared painter.
    if (oldSharedPainter)
        setSharedPainter(oldSharedPainter);
#else
    // Render via backingstore (no shared painter).
    drawWidget(target, paintRegion, offset, flags, 0);
#endif
}

void QWidgetPrivate::paintSiblingsRecursive(QPaintDevice *pdev, const QObjectList& siblings, int index, const QRegion &rgn,
                                            const QPoint &offset, int flags
#ifdef Q_BACKINGSTORE_SUBSURFACES
                                            , const QWindowSurface *currentSurface
#endif
                                            , QPainter *sharedPainter, QWidgetBackingStore *backingStore)
{
    QWidget *w = 0;
    QRect boundingRect;
    bool dirtyBoundingRect = true;
    const bool exludeOpaqueChildren = (flags & DontDrawOpaqueChildren);
    const bool excludeNativeChildren = (flags & DontDrawNativeChildren);

    do {
        QWidget *x =  qobject_cast<QWidget*>(siblings.at(index));
        if (x && !(exludeOpaqueChildren && x->d_func()->isOpaque) && !x->isHidden() && !x->isWindow()
            && !(excludeNativeChildren && x->internalWinId())) {
            if (dirtyBoundingRect) {
                boundingRect = rgn.boundingRect();
                dirtyBoundingRect = false;
            }

            if (qRectIntersects(boundingRect, x->d_func()->effectiveRectFor(x->data->crect))) {
#ifdef Q_BACKINGSTORE_SUBSURFACES
                if (x->windowSurface() == currentSurface)
#endif
                {
                    w = x;
                    break;
                }
            }
        }
        --index;
    } while (index >= 0);

    if (!w)
        return;

    QWidgetPrivate *wd = w->d_func();
    const QPoint widgetPos(w->data->crect.topLeft());
    const bool hasMask = wd->extra && wd->extra->hasMask && !wd->graphicsEffect;
    if (index > 0) {
        QRegion wr(rgn);
        if (wd->isOpaque)
            wr -= hasMask ? wd->extra->mask.translated(widgetPos) : w->data->crect;
        paintSiblingsRecursive(pdev, siblings, --index, wr, offset, flags
#ifdef Q_BACKINGSTORE_SUBSURFACES
                               , currentSurface
#endif
                               , sharedPainter, backingStore);
    }

    if (w->updatesEnabled()
#ifndef QT_NO_GRAPHICSVIEW
            && (!w->d_func()->extra || !w->d_func()->extra->proxyWidget)
#endif //QT_NO_GRAPHICSVIEW
       ) {
        QRegion wRegion(rgn);
        wRegion &= wd->effectiveRectFor(w->data->crect);
        wRegion.translate(-widgetPos);
        if (hasMask)
            wRegion &= wd->extra->mask;
        wd->drawWidget(pdev, wRegion, offset + widgetPos, flags, sharedPainter, backingStore);
    }
}

#ifndef QT_NO_GRAPHICSEFFECT
QRectF QWidgetEffectSourcePrivate::boundingRect(Qt::CoordinateSystem system) const
{
    if (system != Qt::DeviceCoordinates)
        return m_widget->rect();

    if (!context) {
        // Device coordinates without context not yet supported.
        qWarning("QGraphicsEffectSource::boundingRect: Not yet implemented, lacking device context");
        return QRectF();
    }

    return context->painter->worldTransform().mapRect(m_widget->rect());
}

void QWidgetEffectSourcePrivate::draw(QPainter *painter)
{
    if (!context || context->painter != painter) {
        m_widget->render(painter);
        return;
    }

    // The region saved in the context is neither clipped to the rect
    // nor the mask, so we have to clip it here before calling drawWidget.
    QRegion toBePainted = context->rgn;
    toBePainted &= m_widget->rect();
    QWidgetPrivate *wd = qt_widget_private(m_widget);
    if (wd->extra && wd->extra->hasMask)
        toBePainted &= wd->extra->mask;

    wd->drawWidget(context->pdev, toBePainted, context->offset, context->flags,
                   context->sharedPainter, context->backingStore);
}

QPixmap QWidgetEffectSourcePrivate::pixmap(Qt::CoordinateSystem system, QPoint *offset,
                                           QGraphicsEffect::PixmapPadMode mode) const
{
    const bool deviceCoordinates = (system == Qt::DeviceCoordinates);
    if (!context && deviceCoordinates) {
        // Device coordinates without context not yet supported.
        qWarning("QGraphicsEffectSource::pixmap: Not yet implemented, lacking device context");
        return QPixmap();
    }

    QPoint pixmapOffset;
    QRectF sourceRect = m_widget->rect();

    if (deviceCoordinates) {
        const QTransform &painterTransform = context->painter->worldTransform();
        sourceRect = painterTransform.mapRect(sourceRect);
        pixmapOffset = painterTransform.map(pixmapOffset);
    }

    QRect effectRect;

    if (mode == QGraphicsEffect::PadToEffectiveBoundingRect)
        effectRect = m_widget->graphicsEffect()->boundingRectFor(sourceRect).toAlignedRect();
    else if (mode == QGraphicsEffect::PadToTransparentBorder)
        effectRect = sourceRect.adjusted(-1, -1, 1, 1).toAlignedRect();
    else
        effectRect = sourceRect.toAlignedRect();

    if (offset)
        *offset = effectRect.topLeft();

    pixmapOffset -= effectRect.topLeft();

    QPixmap pixmap(effectRect.size());
    pixmap.fill(Qt::transparent);
    m_widget->render(&pixmap, pixmapOffset, QRegion(), QWidget::DrawChildren);
    return pixmap;
}
#endif //QT_NO_GRAPHICSEFFECT

#ifndef QT_NO_GRAPHICSVIEW

QGraphicsProxyWidget * QWidgetPrivate::nearestGraphicsProxyWidget(const QWidget *origin)
{
    if (origin) {
        QWExtra *extra = origin->d_func()->extra;
        if (extra && extra->proxyWidget)
            return extra->proxyWidget;
        return nearestGraphicsProxyWidget(origin->parentWidget());
    }
    return 0;
}
#endif

void QWidgetPrivate::setLocale_helper(const QLocale &loc, bool forceUpdate)
{
    Q_Q(QWidget);
    if (locale == loc && !forceUpdate)
        return;

    locale = loc;

    if (!children.isEmpty()) {
        for (int i = 0; i < children.size(); ++i) {
            QWidget *w = qobject_cast<QWidget*>(children.at(i));
            if (!w)
                continue;
            if (w->testAttribute(Qt::WA_SetLocale))
                continue;
            if (w->isWindow() && !w->testAttribute(Qt::WA_WindowPropagation))
                continue;
            w->d_func()->setLocale_helper(loc, forceUpdate);
        }
    }
    QEvent e(QEvent::LocaleChange);
    QApplication::sendEvent(q, &e);
}

void QWidget::setLocale(const QLocale &locale)
{
    Q_D(QWidget);

    setAttribute(Qt::WA_SetLocale);
    d->setLocale_helper(locale);
}

QLocale QWidget::locale() const
{
    Q_D(const QWidget);

    return d->locale;
}

void QWidgetPrivate::resolveLocale()
{
    Q_Q(const QWidget);

    if (!q->testAttribute(Qt::WA_SetLocale)) {
        setLocale_helper(q->isWindow()
                            ? QLocale()
                            : q->parentWidget()->locale());
    }
}

void QWidget::unsetLocale()
{
    Q_D(QWidget);
    setAttribute(Qt::WA_SetLocale, false);
    d->resolveLocale();
}

static QString constructWindowTitleFromFilePath(const QString &filePath)
{
    QFileInfo fi(filePath);
    QString windowTitle = fi.fileName() + QLatin1String("[*]");
#ifndef Q_WS_MAC
    QString appName = QApplication::applicationName();
    if (!appName.isEmpty())
        windowTitle += QLatin1Char(' ') + QChar(0x2014) + QLatin1Char(' ') + appName;
#endif
    return windowTitle;
}

QString QWidget::windowTitle() const
{
    Q_D(const QWidget);
    if (d->extra && d->extra->topextra) {
        if (!d->extra->topextra->caption.isEmpty())
            return d->extra->topextra->caption;
        if (!d->extra->topextra->filePath.isEmpty())
            return constructWindowTitleFromFilePath(d->extra->topextra->filePath);
    }
    return QString();
}

QString qt_setWindowTitle_helperHelper(const QString &title, const QWidget *widget)
{
    Q_ASSERT(widget);

#ifdef QT_EVAL
    extern QString qt_eval_adapt_window_title(const QString &title);
    QString cap = qt_eval_adapt_window_title(title);
#else
    QString cap = title;
#endif

    if (cap.isEmpty())
        return cap;

    QLatin1String placeHolder("[*]");
    int placeHolderLength = 3; // QLatin1String doesn't have length()

    int index = cap.indexOf(placeHolder);

    // here the magic begins
    while (index != -1) {
        index += placeHolderLength;
        int count = 1;
        while (cap.indexOf(placeHolder, index) == index) {
            ++count;
            index += placeHolderLength;
        }

        if (count%2) { // odd number of [*] -> replace last one
            int lastIndex = cap.lastIndexOf(placeHolder, index - 1);
            if (widget->isWindowModified()
             && widget->style()->styleHint(QStyle::SH_TitleBar_ModifyNotification, 0, widget))
                cap.replace(lastIndex, 3, QWidget::tr("*"));
            else
                cap.remove(lastIndex, 3);
        }

        index = cap.indexOf(placeHolder, index);
    }

    cap.replace(QLatin1String("[*][*]"), placeHolder);

    return cap;
}

void QWidgetPrivate::setWindowTitle_helper(const QString &title)
{
    Q_Q(QWidget);
    if (q->testAttribute(Qt::WA_WState_Created))
        setWindowTitle_sys(qt_setWindowTitle_helperHelper(title, q));
}

void QWidgetPrivate::setWindowIconText_helper(const QString &title)
{
    Q_Q(QWidget);
    if (q->testAttribute(Qt::WA_WState_Created))
        setWindowIconText_sys(qt_setWindowTitle_helperHelper(title, q));
}

void QWidget::setWindowIconText(const QString &iconText)
{
    if (QWidget::windowIconText() == iconText)
        return;

    Q_D(QWidget);
    d->topData()->iconText = iconText;
    d->setWindowIconText_helper(iconText);

    QEvent e(QEvent::IconTextChange);
    QApplication::sendEvent(this, &e);
}

void QWidget::setWindowTitle(const QString &title)
{
    if (QWidget::windowTitle() == title && !title.isEmpty() && !title.isNull())
        return;

    Q_D(QWidget);
    d->topData()->caption = title;
    d->setWindowTitle_helper(title);

    QEvent e(QEvent::WindowTitleChange);
    QApplication::sendEvent(this, &e);
}


QIcon QWidget::windowIcon() const
{
    const QWidget *w = this;
    while (w) {
        const QWidgetPrivate *d = w->d_func();
        if (d->extra && d->extra->topextra && d->extra->topextra->icon)
            return *d->extra->topextra->icon;
        w = w->parentWidget();
    }
    return QApplication::windowIcon();
}

void QWidgetPrivate::setWindowIcon_helper()
{
    QEvent e(QEvent::WindowIconChange);
    QApplication::sendEvent(q_func(), &e);
    for (int i = 0; i < children.size(); ++i) {
        QWidget *w = qobject_cast<QWidget *>(children.at(i));
        if (w && !w->isWindow())
            QApplication::sendEvent(w, &e);
    }
}

void QWidget::setWindowIcon(const QIcon &icon)
{
    Q_D(QWidget);

    setAttribute(Qt::WA_SetWindowIcon, !icon.isNull());
    d->createTLExtra();

    if (!d->extra->topextra->icon)
        d->extra->topextra->icon = new QIcon();
    *d->extra->topextra->icon = icon;

    delete d->extra->topextra->iconPixmap;
    d->extra->topextra->iconPixmap = 0;

    d->setWindowIcon_sys();
    d->setWindowIcon_helper();
}


QString QWidget::windowIconText() const
{
    Q_D(const QWidget);
    return (d->extra && d->extra->topextra) ? d->extra->topextra->iconText : QString();
}

QString QWidget::windowFilePath() const
{
    Q_D(const QWidget);
    return (d->extra && d->extra->topextra) ? d->extra->topextra->filePath : QString();
}

void QWidget::setWindowFilePath(const QString &filePath)
{
    if (filePath == windowFilePath())
        return;

    Q_D(QWidget);

    d->createTLExtra();
    d->extra->topextra->filePath = filePath;
    d->setWindowFilePath_helper(filePath);
}

void QWidgetPrivate::setWindowFilePath_helper(const QString &filePath)
{
    if (extra->topextra && extra->topextra->caption.isEmpty()) {
#ifdef Q_WS_MAC
        setWindowTitle_helper(QFileInfo(filePath).fileName());
#else
        Q_Q(QWidget);
        Q_UNUSED(filePath);
        setWindowTitle_helper(q->windowTitle());
#endif
    }
#ifdef Q_WS_MAC
    setWindowFilePath_sys(filePath);
#endif
}

QString QWidget::windowRole() const
{
    Q_D(const QWidget);
    return (d->extra && d->extra->topextra) ? d->extra->topextra->role : QString();
}

void QWidget::setWindowRole(const QString &role)
{
#if defined(Q_WS_X11)
    Q_D(QWidget);
    d->topData()->role = role;
    d->setWindowRole();
#else
    Q_UNUSED(role)
#endif
}

void QWidget::setFocusProxy(QWidget * w)
{
    Q_D(QWidget);
    if (!w && !d->extra)
        return;

    for (QWidget* fp  = w; fp; fp = fp->focusProxy()) {
        if (fp == this) {
            qWarning("QWidget: %s (%s) already in focus proxy chain", metaObject()->className(), objectName().toLocal8Bit().constData());
            return;
        }
    }

    d->createExtra();
    d->extra->focus_proxy = w;
}


QWidget * QWidget::focusProxy() const
{
    Q_D(const QWidget);
    return d->extra ? (QWidget *)d->extra->focus_proxy : 0;
}


bool QWidget::hasFocus() const
{
    const QWidget* w = this;
    while (w->d_func()->extra && w->d_func()->extra->focus_proxy)
        w = w->d_func()->extra->focus_proxy;
    if (QWidget *window = w->window()) {
#ifndef QT_NO_GRAPHICSVIEW
        QWExtra *e = window->d_func()->extra;
        if (e && e->proxyWidget && e->proxyWidget->hasFocus() && window->focusWidget() == w)
            return true;
#endif
    }
    return (QApplication::focusWidget() == w);
}

void QWidget::setFocus(Qt::FocusReason reason)
{
    if (!isEnabled())
        return;

    QWidget *f = this;
    while (f->d_func()->extra && f->d_func()->extra->focus_proxy)
        f = f->d_func()->extra->focus_proxy;

    if (QApplication::focusWidget() == f
#if defined(Q_WS_WIN)
        && GetFocus() == f->internalWinId()
#endif
       )
        return;

#ifndef QT_NO_GRAPHICSVIEW
    QWidget *previousProxyFocus = 0;
    if (QWExtra *topData = window()->d_func()->extra) {
        if (topData->proxyWidget && topData->proxyWidget->hasFocus()) {
            previousProxyFocus = topData->proxyWidget->widget()->focusWidget();
            if (previousProxyFocus && previousProxyFocus->focusProxy())
                previousProxyFocus = previousProxyFocus->focusProxy();
            if (previousProxyFocus == this && !topData->proxyWidget->d_func()->proxyIsGivingFocus)
                return;
        }
    }
#endif

    QWidget *w = f;
    if (isHidden()) {
        while (w && w->isHidden()) {
            w->d_func()->focus_child = f;
            w = w->isWindow() ? 0 : w->parentWidget();
        }
    } else {
        while (w) {
            w->d_func()->focus_child = f;
            w = w->isWindow() ? 0 : w->parentWidget();
        }
    }

#ifndef QT_NO_GRAPHICSVIEW
    // Update proxy state
    if (QWExtra *topData = window()->d_func()->extra) {
        if (topData->proxyWidget && !topData->proxyWidget->hasFocus()) {
            topData->proxyWidget->d_func()->focusFromWidgetToProxy = 1;
            topData->proxyWidget->setFocus(reason);
            topData->proxyWidget->d_func()->focusFromWidgetToProxy = 0;
        }
    }
#endif

    if (f->isActiveWindow()) {
        QApplicationPrivate::setFocusWidget(f, reason);
#ifndef QT_NO_ACCESSIBILITY
# ifdef Q_OS_WIN
        // The negation of the condition in setFocus_sys
        if (!(testAttribute(Qt::WA_WState_Created) && window()->windowType() != Qt::Popup && internalWinId()))
            //setFocusWidget will already post a focus event for us (that the AT client receives) on Windows
# endif
# ifdef  Q_OS_UNIX
        // menus update the focus manually and this would create bogus events
        if (!(f->inherits("QMenuBar") || f->inherits("QMenu") || f->inherits("QMenuItem")))
# endif
            QAccessible::updateAccessibility(f, 0, QAccessible::Focus);
#endif
#ifndef QT_NO_GRAPHICSVIEW
        if (QWExtra *topData = window()->d_func()->extra) {
            if (topData->proxyWidget) {
                if (previousProxyFocus && previousProxyFocus != f) {
                    // Send event to self
                    QFocusEvent event(QEvent::FocusOut, reason);
                    QPointer<QWidget> that = previousProxyFocus;
                    QApplication::sendEvent(previousProxyFocus, &event);
                    if (that)
                        QApplication::sendEvent(that->style(), &event);
                }
                if (!isHidden()) {
#ifndef QT_NO_GRAPHICSVIEW
                    // Update proxy state
                    if (QWExtra *topData = window()->d_func()->extra)
                        if (topData->proxyWidget && topData->proxyWidget->hasFocus())
                            topData->proxyWidget->d_func()->updateProxyInputMethodAcceptanceFromWidget();
#endif
                    // Send event to self
                    QFocusEvent event(QEvent::FocusIn, reason);
                    QPointer<QWidget> that = f;
                    QApplication::sendEvent(f, &event);
                    if (that)
                        QApplication::sendEvent(that->style(), &event);
                }
            }
        }
#endif
    }
}

void QWidget::clearFocus()
{
    QWidget *w = this;
    while (w) {
        if (w->d_func()->focus_child == this)
            w->d_func()->focus_child = 0;
        w = w->parentWidget();
    }
#ifndef QT_NO_GRAPHICSVIEW
    QWExtra *topData = d_func()->extra;
    if (topData && topData->proxyWidget)
        topData->proxyWidget->clearFocus();
#endif

    if (hasFocus()) {
        // Update proxy state
        QApplicationPrivate::setFocusWidget(0, Qt::OtherFocusReason);
#if defined(Q_WS_WIN)
        if (!(windowType() == Qt::Popup) && GetFocus() == internalWinId())
            SetFocus(0);
        else
#endif
        {
#ifndef QT_NO_ACCESSIBILITY
            QAccessible::updateAccessibility(this, 0, QAccessible::Focus);
#endif
        }
    }
}


bool QWidget::focusNextPrevChild(bool next)
{
    Q_D(QWidget);
    QWidget* p = parentWidget();
    bool isSubWindow = (windowType() == Qt::SubWindow);
    if (!isWindow() && !isSubWindow && p)
        return p->focusNextPrevChild(next);
#ifndef QT_NO_GRAPHICSVIEW
    if (d->extra && d->extra->proxyWidget)
        return d->extra->proxyWidget->focusNextPrevChild(next);
#endif
    QWidget *w = QApplicationPrivate::focusNextPrevChild_helper(this, next);
    if (!w) return false;

    w->setFocus(next ? Qt::TabFocusReason : Qt::BacktabFocusReason);
    return true;
}

QWidget *QWidget::focusWidget() const
{
    return const_cast<QWidget *>(d_func()->focus_child);
}

QWidget *QWidget::nextInFocusChain() const
{
    return const_cast<QWidget *>(d_func()->focus_next);
}

QWidget *QWidget::previousInFocusChain() const
{
    return const_cast<QWidget *>(d_func()->focus_prev);
}

bool QWidget::isActiveWindow() const
{
    QWidget *tlw = window();
    if(tlw == QApplication::activeWindow() || (isVisible() && (tlw->windowType() == Qt::Popup)))
        return true;

#ifndef QT_NO_GRAPHICSVIEW
    if (QWExtra *tlwExtra = tlw->d_func()->extra) {
        if (isVisible() && tlwExtra->proxyWidget)
            return tlwExtra->proxyWidget->isActiveWindow();
    }
#endif

#ifdef Q_WS_MAC
    extern bool qt_mac_is_macdrawer(const QWidget *); //qwidget_mac.cpp
    if(qt_mac_is_macdrawer(tlw) &&
       tlw->parentWidget() && tlw->parentWidget()->isActiveWindow())
        return true;

    extern bool qt_mac_insideKeyWindow(const QWidget *); //qwidget_mac.cpp
    if (QApplication::testAttribute(Qt::AA_MacPluginApplication) && qt_mac_insideKeyWindow(tlw))
        return true;
#endif
    if(style()->styleHint(QStyle::SH_Widget_ShareActivation, 0, this)) {
        if(tlw->windowType() == Qt::Tool &&
           !tlw->isModal() &&
           (!tlw->parentWidget() || tlw->parentWidget()->isActiveWindow()))
           return true;
        QWidget *w = QApplication::activeWindow();
        while(w && tlw->windowType() == Qt::Tool &&
              !w->isModal() && w->parentWidget()) {
            w = w->parentWidget()->window();
            if(w == tlw)
                return true;
        }
    }
#if defined(Q_WS_WIN32)
    HWND active = GetActiveWindow();
    if (!tlw->testAttribute(Qt::WA_WState_Created))
        return false;
    return active == tlw->internalWinId() || ::IsChild(active, tlw->internalWinId());
#else
    return false;
#endif
}

void QWidget::setTabOrder(QWidget* first, QWidget *second)
{
    if (!first || !second || first->focusPolicy() == Qt::NoFocus || second->focusPolicy() == Qt::NoFocus)
        return;

    if (first->window() != second->window()) {
        qWarning("QWidget::setTabOrder: 'first' and 'second' must be in the same window");
        return;
    }

    QWidget *fp = first->focusProxy();
    if (fp) {
        // If first is redirected, set first to the last child of first
        // that can take keyboard focus so that second is inserted after
        // that last child, and the focus order within first is (more
        // likely to be) preserved.
        QList<QWidget *> l = first->findChildren<QWidget *>();
        for (int i = l.size()-1; i >= 0; --i) {
            QWidget * next = l.at(i);
            if (next->window() == fp->window()) {
                fp = next;
                if (fp->focusPolicy() != Qt::NoFocus)
                    break;
            }
        }
        first = fp;
    }

    if (fp == second)
        return;

    if (QWidget *sp = second->focusProxy())
        second = sp;

//    QWidget *fp = first->d_func()->focus_prev;
    QWidget *fn = first->d_func()->focus_next;

    if (fn == second || first == second)
        return;

    QWidget *sp = second->d_func()->focus_prev;
    QWidget *sn = second->d_func()->focus_next;

    fn->d_func()->focus_prev = second;
    first->d_func()->focus_next = second;

    second->d_func()->focus_next = fn;
    second->d_func()->focus_prev = first;

    sp->d_func()->focus_next = sn;
    sn->d_func()->focus_prev = sp;


    Q_ASSERT(first->d_func()->focus_next->d_func()->focus_prev == first);
    Q_ASSERT(first->d_func()->focus_prev->d_func()->focus_next == first);

    Q_ASSERT(second->d_func()->focus_next->d_func()->focus_prev == second);
    Q_ASSERT(second->d_func()->focus_prev->d_func()->focus_next == second);
}

void QWidgetPrivate::reparentFocusWidgets(QWidget * oldtlw)
{
    Q_Q(QWidget);
    if (oldtlw == q->window())
        return; // nothing to do

    if(focus_child)
        focus_child->clearFocus();

    // separate the focus chain into new (children of myself) and old (the rest)
    QWidget *firstOld = 0;
    //QWidget *firstNew = q; //invariant
    QWidget *o = 0; // last in the old list
    QWidget *n = q; // last in the new list

    bool prevWasNew = true;
    QWidget *w = focus_next;

    //Note: for efficiency, we do not maintain the list invariant inside the loop
    //we append items to the relevant list, and we optimize by not changing pointers
    //when subsequent items are going into the same list.
    while (w  != q) {
        bool currentIsNew =  q->isAncestorOf(w);
        if (currentIsNew) {
            if (!prevWasNew) {
                //prev was old -- append to new list
                n->d_func()->focus_next = w;
                w->d_func()->focus_prev = n;
            }
            n = w;
        } else {
            if (prevWasNew) {
                //prev was new -- append to old list, if there is one
                if (o) {
                    o->d_func()->focus_next = w;
                    w->d_func()->focus_prev = o;
                } else {
                    // "create" the old list
                    firstOld = w;
                }
            }
            o = w;
        }
        w = w->d_func()->focus_next;
        prevWasNew = currentIsNew;
    }

    //repair the old list:
    if (firstOld) {
        o->d_func()->focus_next = firstOld;
        firstOld->d_func()->focus_prev = o;
    }

    if (!q->isWindow()) {
        QWidget *topLevel = q->window();
        //insert new chain into toplevel's chain

        QWidget *prev = topLevel->d_func()->focus_prev;

        topLevel->d_func()->focus_prev = n;
        prev->d_func()->focus_next = q;

        focus_prev = prev;
        n->d_func()->focus_next = topLevel;
    } else {
        //repair the new list
            n->d_func()->focus_next = q;
            focus_prev = n;
    }

}

int QWidgetPrivate::pointToRect(const QPoint &p, const QRect &r)
{
    int dx = 0;
    int dy = 0;
    if (p.x() < r.left())
        dx = r.left() - p.x();
    else if (p.x() > r.right())
        dx = p.x() - r.right();
    if (p.y() < r.top())
        dy = r.top() - p.y();
    else if (p.y() > r.bottom())
        dy = p.y() - r.bottom();
    return dx + dy;
}

QSize QWidget::frameSize() const
{
    Q_D(const QWidget);
    if (isWindow() && !(windowType() == Qt::Popup)) {
        QRect fs = d->frameStrut();
        return QSize(data->crect.width() + fs.left() + fs.right(),
                      data->crect.height() + fs.top() + fs.bottom());
    }
    return data->crect.size();
}

void QWidget::move(const QPoint &p)
{
    Q_D(QWidget);
    setAttribute(Qt::WA_Moved);
    if (isWindow())
        d->topData()->posFromMove = true;
    if (testAttribute(Qt::WA_WState_Created)) {
        d->setGeometry_sys(p.x() + geometry().x() - QWidget::x(),
                       p.y() + geometry().y() - QWidget::y(),
                       width(), height(), true);
        d->setDirtyOpaqueRegion();
    } else {
        data->crect.moveTopLeft(p); // no frame yet
        setAttribute(Qt::WA_PendingMoveEvent);
    }
}

void QWidget::resize(const QSize &s)
{
    Q_D(QWidget);
    setAttribute(Qt::WA_Resized);
    if (testAttribute(Qt::WA_WState_Created)) {
        d->setGeometry_sys(geometry().x(), geometry().y(), s.width(), s.height(), false);
        d->setDirtyOpaqueRegion();
    } else {
        data->crect.setSize(s.boundedTo(maximumSize()).expandedTo(minimumSize()));
        setAttribute(Qt::WA_PendingResizeEvent);
    }
}

void QWidget::setGeometry(const QRect &r)
{
    Q_D(QWidget);
    setAttribute(Qt::WA_Resized);
    setAttribute(Qt::WA_Moved);
    if (isWindow())
        d->topData()->posFromMove = false;
    if (testAttribute(Qt::WA_WState_Created)) {
        d->setGeometry_sys(r.x(), r.y(), r.width(), r.height(), true);
        d->setDirtyOpaqueRegion();
    } else {
        data->crect.setTopLeft(r.topLeft());
        data->crect.setSize(r.size().boundedTo(maximumSize()).expandedTo(minimumSize()));
        setAttribute(Qt::WA_PendingMoveEvent);
        setAttribute(Qt::WA_PendingResizeEvent);
    }
}

QByteArray QWidget::saveGeometry() const
{
#ifdef QT_MAC_USE_COCOA
    // We check if the window was maximized during this invocation. If so, we need to record the
    // starting position as 0,0.
    Q_D(const QWidget);
    QRect newFramePosition = frameGeometry();
    QRect newNormalPosition = normalGeometry();
    if(d->topData()->wasMaximized && !(windowState() & Qt::WindowMaximized)) {
        // Change the starting position
        newFramePosition.moveTo(0, 0);
        newNormalPosition.moveTo(0, 0);
    }
#endif // QT_MAC_USE_COCOA
    QByteArray array;
    QDataStream stream(&array, QIODevice::WriteOnly);
    stream.setVersion(QDataStream::Qt_4_0);
    const quint32 magicNumber = 0x1D9D0CB;
    quint16 majorVersion = 1;
    quint16 minorVersion = 0;
    stream << magicNumber
           << majorVersion
           << minorVersion
#ifdef QT_MAC_USE_COCOA
           << newFramePosition
           << newNormalPosition
#else
           << frameGeometry()
           << normalGeometry()
#endif // QT_MAC_USE_COCOA
           << qint32(QApplication::desktop()->screenNumber(this))
           << quint8(windowState() & Qt::WindowMaximized)
           << quint8(windowState() & Qt::WindowFullScreen);
    return array;
}

bool QWidget::restoreGeometry(const QByteArray &geometry)
{
    if (geometry.size() < 4)
        return false;
    QDataStream stream(geometry);
    stream.setVersion(QDataStream::Qt_4_0);

    const quint32 magicNumber = 0x1D9D0CB;
    quint32 storedMagicNumber;
    stream >> storedMagicNumber;
    if (storedMagicNumber != magicNumber)
        return false;

    const quint16 currentMajorVersion = 1;
    quint16 majorVersion = 0;
    quint16 minorVersion = 0;

    stream >> majorVersion >> minorVersion;

    if (majorVersion != currentMajorVersion)
        return false;
    // (Allow all minor versions.)

    QRect restoredFrameGeometry;
     QRect restoredNormalGeometry;
    qint32 restoredScreenNumber;
    quint8 maximized;
    quint8 fullScreen;

    stream >> restoredFrameGeometry
           >> restoredNormalGeometry
           >> restoredScreenNumber
           >> maximized
           >> fullScreen;

    const int frameHeight = 20;
    if (!restoredFrameGeometry.isValid())
        restoredFrameGeometry = QRect(QPoint(0,0), sizeHint());

    if (!restoredNormalGeometry.isValid())
        restoredNormalGeometry = QRect(QPoint(0, frameHeight), sizeHint());
    if (!restoredNormalGeometry.isValid()) {
        // use the widget's adjustedSize if the sizeHint() doesn't help
        restoredNormalGeometry.setSize(restoredNormalGeometry
                                       .size()
                                       .expandedTo(d_func()->adjustedSize()));
    }

    const QDesktopWidget * const desktop = QApplication::desktop();
    if (restoredScreenNumber >= desktop->numScreens())
        restoredScreenNumber = desktop->primaryScreen();

    const QRect availableGeometry = desktop->availableGeometry(restoredScreenNumber);

    // Modify the restored geometry if we are about to restore to coordinates
    // that would make the window "lost". This happens if:
    // - The restored geometry is completely oustside the available geometry
    // - The title bar is outside the available geometry.
    // - (Mac only) The window is higher than the available geometry. It must
    //   be possible to bring the size grip on screen by moving the window.
#ifdef Q_WS_MAC
    restoredFrameGeometry.setHeight(qMin(restoredFrameGeometry.height(), availableGeometry.height()));
    restoredNormalGeometry.setHeight(qMin(restoredNormalGeometry.height(), availableGeometry.height() - frameHeight));
#endif

    if (!restoredFrameGeometry.intersects(availableGeometry)) {
        restoredFrameGeometry.moveBottom(qMin(restoredFrameGeometry.bottom(), availableGeometry.bottom()));
        restoredFrameGeometry.moveLeft(qMax(restoredFrameGeometry.left(), availableGeometry.left()));
        restoredFrameGeometry.moveRight(qMin(restoredFrameGeometry.right(), availableGeometry.right()));
    }
    restoredFrameGeometry.moveTop(qMax(restoredFrameGeometry.top(), availableGeometry.top()));

    if (!restoredNormalGeometry.intersects(availableGeometry)) {
        restoredNormalGeometry.moveBottom(qMin(restoredNormalGeometry.bottom(), availableGeometry.bottom()));
        restoredNormalGeometry.moveLeft(qMax(restoredNormalGeometry.left(), availableGeometry.left()));
        restoredNormalGeometry.moveRight(qMin(restoredNormalGeometry.right(), availableGeometry.right()));
    }
    restoredNormalGeometry.moveTop(qMax(restoredNormalGeometry.top(), availableGeometry.top() + frameHeight));

    if (maximized || fullScreen) {
        // set geomerty before setting the window state to make
        // sure the window is maximized to the right screen.
        Qt::WindowStates ws = windowState();
#ifndef Q_WS_WIN
        setGeometry(restoredNormalGeometry);
#else
        if (ws & Qt::WindowFullScreen) {
            // Full screen is not a real window state on Windows.
            move(availableGeometry.topLeft());
        } else if (ws & Qt::WindowMaximized) {
            // Setting a geometry on an already maximized window causes this to be
            // restored into a broken, half-maximized state, non-resizable state (QTBUG-4397).
            // Move the window in normal state if needed.
            if (restoredScreenNumber != desktop->screenNumber(this)) {
                setWindowState(Qt::WindowNoState);
                setGeometry(restoredNormalGeometry);
            }
        } else {
            setGeometry(restoredNormalGeometry);
        }
#endif // Q_WS_WIN
        if (maximized)
            ws |= Qt::WindowMaximized;
        if (fullScreen)
            ws |= Qt::WindowFullScreen;
       setWindowState(ws);
       d_func()->topData()->normalGeometry = restoredNormalGeometry;
    } else {
        QPoint offset;
#ifdef Q_WS_X11
        if (isFullScreen())
            offset = d_func()->topData()->fullScreenOffset;
#endif
        setWindowState(windowState() & ~(Qt::WindowMaximized | Qt::WindowFullScreen));
        move(restoredFrameGeometry.topLeft() + offset);
        resize(restoredNormalGeometry.size());
    }
    return true;
}

void QWidget::setContentsMargins(int left, int top, int right, int bottom)
{
    Q_D(QWidget);
    if (left == d->leftmargin && top == d->topmargin
         && right == d->rightmargin && bottom == d->bottommargin)
        return;
    d->leftmargin = left;
    d->topmargin = top;
    d->rightmargin = right;
    d->bottommargin = bottom;

    if (QLayout *l=d->layout)
        l->update(); //force activate; will do updateGeometry
    else
        updateGeometry();

    // ### Qt 5: compat, remove
    if (isVisible()) {
        update();
        QResizeEvent e(data->crect.size(), data->crect.size());
        QApplication::sendEvent(this, &e);
    } else {
        setAttribute(Qt::WA_PendingResizeEvent, true);
    }

    QEvent e(QEvent::ContentsRectChange);
    QApplication::sendEvent(this, &e);
}

void QWidget::setContentsMargins(const QMargins &margins)
{
    setContentsMargins(margins.left(), margins.top(),
                       margins.right(), margins.bottom());
}

void QWidget::getContentsMargins(int *left, int *top, int *right, int *bottom) const
{
    Q_D(const QWidget);
    if (left)
        *left = d->leftmargin;
    if (top)
        *top = d->topmargin;
    if (right)
        *right = d->rightmargin;
    if (bottom)
        *bottom = d->bottommargin;
}

QMargins QWidget::contentsMargins() const
{
    Q_D(const QWidget);
    return QMargins(d->leftmargin, d->topmargin, d->rightmargin, d->bottommargin);
}


QRect QWidget::contentsRect() const
{
    Q_D(const QWidget);
    return QRect(QPoint(d->leftmargin, d->topmargin),
                 QPoint(data->crect.width() - 1 - d->rightmargin,
                        data->crect.height() - 1 - d->bottommargin));

}



Qt::ContextMenuPolicy QWidget::contextMenuPolicy() const
{
    return (Qt::ContextMenuPolicy)data->context_menu_policy;
}

void QWidget::setContextMenuPolicy(Qt::ContextMenuPolicy policy)
{
    data->context_menu_policy = (uint) policy;
}

Qt::FocusPolicy QWidget::focusPolicy() const
{
    return (Qt::FocusPolicy)data->focus_policy;
}

void QWidget::setFocusPolicy(Qt::FocusPolicy policy)
{
    data->focus_policy = (uint) policy;
    Q_D(QWidget);
    if (d->extra && d->extra->focus_proxy)
        d->extra->focus_proxy->setFocusPolicy(policy);
}

void QWidget::setUpdatesEnabled(bool enable)
{
    Q_D(QWidget);
    setAttribute(Qt::WA_ForceUpdatesDisabled, !enable);
    d->setUpdatesEnabled_helper(enable);
}

void QWidgetPrivate::show_recursive()
{
    Q_Q(QWidget);
    // polish if necessary

    if (!q->testAttribute(Qt::WA_WState_Created))
        createRecursively();
    q->ensurePolished();

#ifdef QT3_SUPPORT
    if(sendChildEvents)
        QApplication::sendPostedEvents(q, QEvent::ChildInserted);
#endif
    if (!q->isWindow() && q->parentWidget()->d_func()->layout && !q->parentWidget()->data->in_show)
        q->parentWidget()->d_func()->layout->activate();
    // activate our layout before we and our children become visible
    if (layout)
        layout->activate();

    show_helper();
}

void QWidgetPrivate::sendPendingMoveAndResizeEvents(bool recursive, bool disableUpdates)
{
    Q_Q(QWidget);

    disableUpdates = disableUpdates && q->updatesEnabled();
    if (disableUpdates)
        q->setAttribute(Qt::WA_UpdatesDisabled);

    if (q->testAttribute(Qt::WA_PendingMoveEvent)) {
        QMoveEvent e(data.crect.topLeft(), data.crect.topLeft());
        QApplication::sendEvent(q, &e);
        q->setAttribute(Qt::WA_PendingMoveEvent, false);
    }

    if (q->testAttribute(Qt::WA_PendingResizeEvent)) {
        QResizeEvent e(data.crect.size(), QSize());
        QApplication::sendEvent(q, &e);
        q->setAttribute(Qt::WA_PendingResizeEvent, false);
    }

    if (disableUpdates)
        q->setAttribute(Qt::WA_UpdatesDisabled, false);

    if (!recursive)
        return;

    for (int i = 0; i < children.size(); ++i) {
        if (QWidget *child = qobject_cast<QWidget *>(children.at(i)))
            child->d_func()->sendPendingMoveAndResizeEvents(recursive, disableUpdates);
    }
}

void QWidgetPrivate::activateChildLayoutsRecursively()
{
    sendPendingMoveAndResizeEvents(false, true);

    for (int i = 0; i < children.size(); ++i) {
        QWidget *child = qobject_cast<QWidget *>(children.at(i));
        if (!child || child->isHidden() || child->isWindow())
            continue;

        child->ensurePolished();

        // Activate child's layout
        QWidgetPrivate *childPrivate = child->d_func();
        if (childPrivate->layout)
            childPrivate->layout->activate();

        // Pretend we're visible.
        const bool wasVisible = child->isVisible();
        if (!wasVisible)
            child->setAttribute(Qt::WA_WState_Visible);

        // Do the same for all my children.
        childPrivate->activateChildLayoutsRecursively();

        // We're not cheating anymore.
        if (!wasVisible)
            child->setAttribute(Qt::WA_WState_Visible, false);
    }
}

void QWidgetPrivate::show_helper()
{
    Q_Q(QWidget);
    data.in_show = true; // qws optimization
    // make sure we receive pending move and resize events
    sendPendingMoveAndResizeEvents();

    // become visible before showing all children
    q->setAttribute(Qt::WA_WState_Visible);

    // finally show all children recursively
    showChildren(false);

#ifdef QT3_SUPPORT
    if (q->parentWidget() && sendChildEvents)
        QApplication::sendPostedEvents(q->parentWidget(),
                                        QEvent::ChildInserted);
#endif


    // popup handling: new popups and tools need to be raised, and
    // existing popups must be closed. Also propagate the current
    // windows's KeyboardFocusChange status.
    if (q->isWindow()) {
        if ((q->windowType() == Qt::Tool) || (q->windowType() == Qt::Popup) || q->windowType() == Qt::ToolTip) {
            q->raise();
            if (q->parentWidget() && q->parentWidget()->window()->testAttribute(Qt::WA_KeyboardFocusChange))
                q->setAttribute(Qt::WA_KeyboardFocusChange);
        } else {
            while (QApplication::activePopupWidget()) {
                if (!QApplication::activePopupWidget()->close())
                    break;
            }
        }
    }

    // Automatic embedding of child windows of widgets already embedded into
    // QGraphicsProxyWidget when they are shown the first time.
    bool isEmbedded = false;
#ifndef QT_NO_GRAPHICSVIEW
    if (q->isWindow()) {
        isEmbedded = q->graphicsProxyWidget() ? true : false;
        if (!isEmbedded && !bypassGraphicsProxyWidget(q)) {
            QGraphicsProxyWidget *ancestorProxy = nearestGraphicsProxyWidget(q->parentWidget());
            if (ancestorProxy) {
                isEmbedded = true;
                ancestorProxy->d_func()->embedSubWindow(q);
            }
        }
    }
#else
    Q_UNUSED(isEmbedded);
#endif

    // On Windows, show the popup now so that our own focus handling
    // stores the correct old focus widget even if it's stolen in the
    // showevent
#if defined(Q_WS_WIN) || defined(Q_WS_MAC) || defined(Q_OS_SYMBIAN)
    if (!isEmbedded && q->windowType() == Qt::Popup)
        qApp->d_func()->openPopup(q);
#endif

    // send the show event before showing the window
    QShowEvent showEvent;
    QApplication::sendEvent(q, &showEvent);

    if (!isEmbedded && q->isModal() && q->isWindow())
        // QApplicationPrivate::enterModal *before* show, otherwise the initial
        // stacking might be wrong
        QApplicationPrivate::enterModal(q);


    show_sys();

#if !defined(Q_WS_WIN) && !defined(Q_WS_MAC) && !defined(Q_OS_SYMBIAN)
    if (!isEmbedded && q->windowType() == Qt::Popup)
        qApp->d_func()->openPopup(q);
#endif

#ifndef QT_NO_ACCESSIBILITY
    if (q->windowType() != Qt::ToolTip)     // Tooltips are read aloud twice in MS narrator.
        QAccessible::updateAccessibility(q, 0, QAccessible::ObjectShow);
#endif

    if (QApplicationPrivate::hidden_focus_widget == q) {
        QApplicationPrivate::hidden_focus_widget = 0;
        q->setFocus(Qt::OtherFocusReason);
    }

    // Process events when showing a Qt::SplashScreen widget before the event loop
    // is spinnning; otherwise it might not show up on particular platforms.
    // This makes QSplashScreen behave the same on all platforms.
    if (!qApp->d_func()->in_exec && q->windowType() == Qt::SplashScreen)
        QApplication::processEvents();

    data.in_show = false;  // reset qws optimization
}

void QWidgetPrivate::hide_helper()
{
    Q_Q(QWidget);

    bool isEmbedded = false;
#if !defined QT_NO_GRAPHICSVIEW
    isEmbedded = q->isWindow() && !bypassGraphicsProxyWidget(q) && nearestGraphicsProxyWidget(q->parentWidget()) != 0;
#else
    Q_UNUSED(isEmbedded);
#endif

    if (!isEmbedded && (q->windowType() == Qt::Popup))
        qApp->d_func()->closePopup(q);

    // Move test modal here.  Otherwise, a modal dialog could get
    // destroyed and we lose all access to its parent because we haven't
    // left modality.  (Eg. modal Progress Dialog)
    if (!isEmbedded && q->isModal() && q->isWindow())
        QApplicationPrivate::leaveModal(q);

#if defined(Q_WS_WIN)
    if (q->isWindow() && !(q->windowType() == Qt::Popup) && q->parentWidget()
        && !q->parentWidget()->isHidden() && q->isActiveWindow())
        q->parentWidget()->activateWindow();        // Activate parent
#endif

    q->setAttribute(Qt::WA_Mapped, false);
    hide_sys();

    bool wasVisible = q->testAttribute(Qt::WA_WState_Visible);

    if (wasVisible) {
        q->setAttribute(Qt::WA_WState_Visible, false);

    }

    QHideEvent hideEvent;
    QApplication::sendEvent(q, &hideEvent);
    hideChildren(false);

    // next bit tries to move the focus if the focus widget is now
    // hidden.
    if (wasVisible) {
#if defined(Q_WS_WIN) || defined(Q_WS_X11) || defined (Q_WS_QWS) || defined(Q_WS_MAC) || defined(Q_WS_QPA)
        qApp->d_func()->sendSyntheticEnterLeave(q);
#endif

        QWidget *fw = QApplication::focusWidget();
        while (fw &&  !fw->isWindow()) {
            if (fw == q) {
                q->focusNextPrevChild(true);
                break;
            }
            fw = fw->parentWidget();
        }
    }

    if (QWidgetBackingStore *bs = maybeBackingStore())
        bs->removeDirtyWidget(q);

#ifndef QT_NO_ACCESSIBILITY
    if (wasVisible)
        QAccessible::updateAccessibility(q, 0, QAccessible::ObjectHide);
#endif
}

void QWidget::setVisible(bool visible)
{
    if (visible) { // show
        if (testAttribute(Qt::WA_WState_ExplicitShowHide) && !testAttribute(Qt::WA_WState_Hidden))
            return;

        Q_D(QWidget);

        // Designer uses a trick to make grabWidget work without showing
        if (!isWindow() && parentWidget() && parentWidget()->isVisible()
            && !parentWidget()->testAttribute(Qt::WA_WState_Created))
            parentWidget()->window()->d_func()->createRecursively();

        //we have to at least create toplevels before applyX11SpecificCommandLineArguments
        //but not children of non-visible parents
        QWidget *pw = parentWidget();
        if (!testAttribute(Qt::WA_WState_Created)
            && (isWindow() || pw->testAttribute(Qt::WA_WState_Created))) {
            create();
        }

#if defined(Q_WS_X11)
        if (windowType() == Qt::Window)
            QApplicationPrivate::applyX11SpecificCommandLineArguments(this);
#elif defined(Q_WS_QWS)
        if (windowType() == Qt::Window)
            QApplicationPrivate::applyQWSSpecificCommandLineArguments(this);
#endif

        bool wasResized = testAttribute(Qt::WA_Resized);
        Qt::WindowStates initialWindowState = windowState();

        // polish if necessary
        ensurePolished();

        // remember that show was called explicitly
        setAttribute(Qt::WA_WState_ExplicitShowHide);
        // whether we need to inform the parent widget immediately
        bool needUpdateGeometry = !isWindow() && testAttribute(Qt::WA_WState_Hidden);
        // we are no longer hidden
        setAttribute(Qt::WA_WState_Hidden, false);

        if (needUpdateGeometry)
            d->updateGeometry_helper(true);

#ifdef QT3_SUPPORT
        QApplication::sendPostedEvents(this, QEvent::ChildInserted);
#endif
        // activate our layout before we and our children become visible
        if (d->layout)
            d->layout->activate();

        if (!isWindow()) {
            QWidget *parent = parentWidget();
            while (parent && parent->isVisible() && parent->d_func()->layout  && !parent->data->in_show) {
                parent->d_func()->layout->activate();
                if (parent->isWindow())
                    break;
                parent = parent->parentWidget();
            }
            if (parent)
                parent->d_func()->setDirtyOpaqueRegion();
        }

        // adjust size if necessary
        if (!wasResized
            && (isWindow() || !parentWidget()->d_func()->layout))  {
            if (isWindow()) {
                adjustSize();
                if (windowState() != initialWindowState)
                    setWindowState(initialWindowState);
            } else {
                adjustSize();
            }
            setAttribute(Qt::WA_Resized, false);
        }

        setAttribute(Qt::WA_KeyboardFocusChange, false);

        if (isWindow() || parentWidget()->isVisible()) {
            // remove posted quit events when showing a new window
            QCoreApplication::removePostedEvents(qApp, QEvent::Quit);

            d->show_helper();

#if defined(Q_WS_WIN) || defined(Q_WS_X11) || defined (Q_WS_QWS) || defined(Q_WS_MAC) || defined(Q_WS_QPA)
            qApp->d_func()->sendSyntheticEnterLeave(this);
#endif
        }

        QEvent showToParentEvent(QEvent::ShowToParent);
        QApplication::sendEvent(this, &showToParentEvent);
    } else { // hide
        if (testAttribute(Qt::WA_WState_ExplicitShowHide) && testAttribute(Qt::WA_WState_Hidden))
            return;
#if defined(Q_WS_WIN)
        // reset WS_DISABLED style in a Blocked window
        if(isWindow() && testAttribute(Qt::WA_WState_Created)
           && QApplicationPrivate::isBlockedByModal(this))
        {
            LONG dwStyle = GetWindowLong(winId(), GWL_STYLE);
            dwStyle &= ~WS_DISABLED;
            SetWindowLong(winId(), GWL_STYLE, dwStyle);
        }
#endif
        if (QApplicationPrivate::hidden_focus_widget == this)
            QApplicationPrivate::hidden_focus_widget = 0;

        Q_D(QWidget);

        // hw: The test on getOpaqueRegion() needs to be more intelligent
        // currently it doesn't work if the widget is hidden (the region will
        // be clipped). The real check should be testing the cached region
        // (and dirty flag) directly.
        if (!isWindow() && parentWidget()) // && !d->getOpaqueRegion().isEmpty())
            parentWidget()->d_func()->setDirtyOpaqueRegion();

        setAttribute(Qt::WA_WState_Hidden);
        setAttribute(Qt::WA_WState_ExplicitShowHide);
        if (testAttribute(Qt::WA_WState_Created))
            d->hide_helper();

        // invalidate layout similar to updateGeometry()
        if (!isWindow() && parentWidget()) {
            if (parentWidget()->d_func()->layout)
                parentWidget()->d_func()->layout->invalidate();
            else if (parentWidget()->isVisible())
                QApplication::postEvent(parentWidget(), new QEvent(QEvent::LayoutRequest));
        }

        QEvent hideToParentEvent(QEvent::HideToParent);
        QApplication::sendEvent(this, &hideToParentEvent);
    }
}

void QWidgetPrivate::_q_showIfNotHidden()
{
    Q_Q(QWidget);
    if ( !(q->isHidden() && q->testAttribute(Qt::WA_WState_ExplicitShowHide)) )
        q->setVisible(true);
}

void QWidgetPrivate::showChildren(bool spontaneous)
{
    QList<QObject*> childList = children;
    for (int i = 0; i < childList.size(); ++i) {
        QWidget *widget = qobject_cast<QWidget*>(childList.at(i));
        if (!widget
            || widget->isWindow()
            || widget->testAttribute(Qt::WA_WState_Hidden))
            continue;
        if (spontaneous) {
            widget->setAttribute(Qt::WA_Mapped);
            widget->d_func()->showChildren(true);
            QShowEvent e;
            QApplication::sendSpontaneousEvent(widget, &e);
        } else {
            if (widget->testAttribute(Qt::WA_WState_ExplicitShowHide))
                widget->d_func()->show_recursive();
            else
                widget->show();
        }
    }
}

void QWidgetPrivate::hideChildren(bool spontaneous)
{
    QList<QObject*> childList = children;
    for (int i = 0; i < childList.size(); ++i) {
        QWidget *widget = qobject_cast<QWidget*>(childList.at(i));
        if (!widget || widget->isWindow() || widget->testAttribute(Qt::WA_WState_Hidden))
            continue;
#ifdef QT_MAC_USE_COCOA
        // Before doing anything we need to make sure that we don't leave anything in a non-consistent state.
        // When hiding a widget we need to make sure that no mouse_down events are active, because
        // the mouse_up event will never be received by a hidden widget or one of its descendants.
        // The solution is simple, before going through with this we check if there are any mouse_down events in
        // progress, if so we check if it is related to this widget or not. If so, we just reset the mouse_down and
        // then we continue.
        // In X11 and Windows we send a mouse_release event, however we don't do that here because we were already
        // ignoring that from before. I.e. Carbon did not send the mouse release event, so we will not send the
        // mouse release event. There are two ways to interpret this:
        // 1. If we don't send the mouse release event, the widget might get into an inconsistent state, i.e. it
        // might be waiting for a release event that will never arrive.
        // 2. If we send the mouse release event, then the widget might decide to trigger an action that is not
        // supposed to trigger because it is not visible.
        if(widget == qt_button_down)
            qt_button_down = 0;
#endif // QT_MAC_USE_COCOA
        if (spontaneous)
            widget->setAttribute(Qt::WA_Mapped, false);
        else
            widget->setAttribute(Qt::WA_WState_Visible, false);
        widget->d_func()->hideChildren(spontaneous);
        QHideEvent e;
        if (spontaneous) {
            QApplication::sendSpontaneousEvent(widget, &e);
        } else {
            QApplication::sendEvent(widget, &e);
            if (widget->internalWinId()
                && widget->testAttribute(Qt::WA_DontCreateNativeAncestors)) {
                // hide_sys() on an ancestor won't have any affect on this
                // widget, so it needs an explicit hide_sys() of its own
                widget->d_func()->hide_sys();
            }
        }
#if defined(Q_WS_WIN) || defined(Q_WS_X11) || defined (Q_WS_QWS) || defined(Q_WS_MAC) || defined(Q_WS_QPA)
        qApp->d_func()->sendSyntheticEnterLeave(widget);
#endif
#ifndef QT_NO_ACCESSIBILITY
        if (!spontaneous)
            QAccessible::updateAccessibility(widget, 0, QAccessible::ObjectHide);
#endif
    }
}

bool QWidgetPrivate::close_helper(CloseMode mode)
{
    if (data.is_closing)
        return true;

    Q_Q(QWidget);
    data.is_closing = 1;

    QPointer<QWidget> that = q;
    QPointer<QWidget> parentWidget = q->parentWidget();

#ifdef QT3_SUPPORT
    bool isMain = (QApplicationPrivate::main_widget == q);
#endif
    bool quitOnClose = q->testAttribute(Qt::WA_QuitOnClose);
    if (mode != CloseNoEvent) {
        QCloseEvent e;
        if (mode == CloseWithSpontaneousEvent)
            QApplication::sendSpontaneousEvent(q, &e);
        else
            QApplication::sendEvent(q, &e);
        if (!that.isNull() && !e.isAccepted()) {
            data.is_closing = 0;
            return false;
        }
    }

    if (!that.isNull() && !q->isHidden())
        q->hide();

#ifdef QT3_SUPPORT
    if (isMain)
        QApplication::quit();
#endif
    // Attempt to close the application only if this has WA_QuitOnClose set and a non-visible parent
    quitOnClose = quitOnClose && (parentWidget.isNull() || !parentWidget->isVisible());

    if (quitOnClose) {
        /* if there is no non-withdrawn primary window left (except
           the ones without QuitOnClose), we emit the lastWindowClosed
           signal */
        QWidgetList list = QApplication::topLevelWidgets();
        bool lastWindowClosed = true;
        for (int i = 0; i < list.size(); ++i) {
            QWidget *w = list.at(i);
            if (!w->isVisible() || w->parentWidget() || !w->testAttribute(Qt::WA_QuitOnClose))
                continue;
            lastWindowClosed = false;
            break;
        }
        if (lastWindowClosed)
            QApplicationPrivate::emitLastWindowClosed();
    }

    if (!that.isNull()) {
        data.is_closing = 0;
        if (q->testAttribute(Qt::WA_DeleteOnClose)) {
            q->setAttribute(Qt::WA_DeleteOnClose, false);
            q->deleteLater();
        }
    }
    return true;
}


bool QWidget::close()
{
    return d_func()->close_helper(QWidgetPrivate::CloseWithEvent);
}

bool QWidget::isVisibleTo(QWidget* ancestor) const
{
    if (!ancestor)
        return isVisible();
    const QWidget * w = this;
    while (!w->isHidden()
            && !w->isWindow()
            && w->parentWidget()
            && w->parentWidget() != ancestor)
        w = w->parentWidget();
    return !w->isHidden();
}

#ifdef QT3_SUPPORT

QRect QWidget::visibleRect() const
{
    return d_func()->clipRect();
}
#endif

QRegion QWidget::visibleRegion() const
{
    Q_D(const QWidget);

    QRect clipRect = d->clipRect();
    if (clipRect.isEmpty())
        return QRegion();
    QRegion r(clipRect);
    d->subtractOpaqueChildren(r, clipRect);
    d->subtractOpaqueSiblings(r);
#ifdef Q_WS_QWS
    const QWSWindowSurface *surface = static_cast<const QWSWindowSurface*>(windowSurface());
    if (surface) {
        const QPoint offset = mapTo(surface->window(), QPoint());
        r &= surface->clipRegion().translated(-offset);
    }
#endif
    return r;
}


QSize QWidgetPrivate::adjustedSize() const
{
    Q_Q(const QWidget);

    QSize s = q->sizeHint();

    if (q->isWindow()) {
        Qt::Orientations exp;
        if (layout) {
            if (layout->hasHeightForWidth())
                s.setHeight(layout->totalHeightForWidth(s.width()));
            exp = layout->expandingDirections();
        } else
        {
            if (q->sizePolicy().hasHeightForWidth())
                s.setHeight(q->heightForWidth(s.width()));
            exp = q->sizePolicy().expandingDirections();
        }
        if (exp & Qt::Horizontal)
            s.setWidth(qMax(s.width(), 200));
        if (exp & Qt::Vertical)
            s.setHeight(qMax(s.height(), 100));
#if defined(Q_WS_X11)
        QRect screen = QApplication::desktop()->screenGeometry(q->x11Info().screen());
#else // all others
        QRect screen = QApplication::desktop()->screenGeometry(q->pos());
#endif
#if defined (Q_WS_WINCE) || defined (Q_OS_SYMBIAN)
        s.setWidth(qMin(s.width(), screen.width()));
        s.setHeight(qMin(s.height(), screen.height()));
#else
        s.setWidth(qMin(s.width(), screen.width()*2/3));
        s.setHeight(qMin(s.height(), screen.height()*2/3));
#endif
        if (QTLWExtra *extra = maybeTopData())
            extra->sizeAdjusted = true;
    }

    if (!s.isValid()) {
        QRect r = q->childrenRect(); // get children rectangle
        if (r.isNull())
            return s;
        s = r.size() + QSize(2 * r.x(), 2 * r.y());
    }

    return s;
}

void QWidget::adjustSize()
{
    Q_D(QWidget);
    ensurePolished();
    QSize s = d->adjustedSize();

    if (d->layout)
        d->layout->activate();

    if (s.isValid())
        resize(s);
}


QSize QWidget::sizeHint() const
{
    Q_D(const QWidget);
    if (d->layout)
        return d->layout->totalSizeHint();
    return QSize(-1, -1);
}

QSize QWidget::minimumSizeHint() const
{
    Q_D(const QWidget);
    if (d->layout)
        return d->layout->totalMinimumSize();
    return QSize(-1, -1);
}


bool QWidget::isAncestorOf(const QWidget *child) const
{
    while (child) {
        if (child == this)
            return true;
        if (child->isWindow())
            return false;
        child = child->parentWidget();
    }
    return false;
}

#if defined(Q_WS_WIN)
inline void setDisabledStyle(QWidget *w, bool setStyle)
{
    // set/reset WS_DISABLED style.
    if(w && w->isWindow() && w->isVisible() && w->isEnabled()) {
        LONG dwStyle = GetWindowLong(w->winId(), GWL_STYLE);
        LONG newStyle = dwStyle;
        if (setStyle)
            newStyle |= WS_DISABLED;
        else
            newStyle &= ~WS_DISABLED;
        if (newStyle != dwStyle) {
            SetWindowLong(w->winId(), GWL_STYLE, newStyle);
            // we might need to repaint in some situations (eg. menu)
            w->repaint();
        }
    }
}
#endif

/*****************************************************************************
  QWidget event handling
 *****************************************************************************/

bool QWidget::event(QEvent *event)
{
    Q_D(QWidget);

    // ignore mouse events when disabled
    if (!isEnabled()) {
        switch(event->type()) {
        case QEvent::TabletPress:
        case QEvent::TabletRelease:
        case QEvent::TabletMove:
        case QEvent::MouseButtonPress:
        case QEvent::MouseButtonRelease:
        case QEvent::MouseButtonDblClick:
        case QEvent::MouseMove:
        case QEvent::TouchBegin:
        case QEvent::TouchUpdate:
        case QEvent::TouchEnd:
        case QEvent::ContextMenu:
#ifndef QT_NO_WHEELEVENT
        case QEvent::Wheel:
#endif
            return false;
        default:
            break;
        }
    }
    switch (event->type()) {
    case QEvent::MouseMove:
        mouseMoveEvent((QMouseEvent*)event);
        break;

    case QEvent::MouseButtonPress:
        // Don't reset input context here. Whether reset or not is
        // a responsibility of input method. reset() will be
        // called by mouseHandler() of input method if necessary
        // via mousePressEvent() of text widgets.
#if 0
        resetInputContext();
#endif
        mousePressEvent((QMouseEvent*)event);
        break;

    case QEvent::MouseButtonRelease:
        mouseReleaseEvent((QMouseEvent*)event);
        break;

    case QEvent::MouseButtonDblClick:
        mouseDoubleClickEvent((QMouseEvent*)event);
        break;

     case QEvent::NonClientAreaMouseButtonPress: {
        QWidget* w;
        while ((w = QApplication::activePopupWidget()) && w != this) {
            w->close();
            if (QApplication::activePopupWidget() == w) // widget does not want to disappear
                w->hide(); // hide at least
            }
        break;
        }

#ifndef QT_NO_WHEELEVENT
    case QEvent::Wheel:
        wheelEvent((QWheelEvent*)event);
        break;
#endif
#ifndef QT_NO_TABLETEVENT
    case QEvent::TabletMove:
    case QEvent::TabletPress:
    case QEvent::TabletRelease:
        tabletEvent((QTabletEvent*)event);
        break;
#endif
#ifdef QT3_SUPPORT
    case QEvent::Accel:
        event->ignore();
        return false;
#endif
    case QEvent::KeyPress: {
        QKeyEvent *k = (QKeyEvent *)event;
        bool res = false;
        if (!(k->modifiers() & (Qt::ControlModifier | Qt::AltModifier))) {  //### Add MetaModifier?
            if (k->key() == Qt::Key_Backtab
                || (k->key() == Qt::Key_Tab && (k->modifiers() & Qt::ShiftModifier)))
                res = focusNextPrevChild(false);
            else if (k->key() == Qt::Key_Tab)
                res = focusNextPrevChild(true);
            if (res)
                break;
        }
        keyPressEvent(k);
#ifdef QT_KEYPAD_NAVIGATION
        if (!k->isAccepted() && QApplication::keypadNavigationEnabled()
            && !(k->modifiers() & (Qt::ControlModifier | Qt::AltModifier | Qt::ShiftModifier))) {
            if (QApplication::navigationMode() == Qt::NavigationModeKeypadTabOrder) {
                if (k->key() == Qt::Key_Up)
                    res = focusNextPrevChild(false);
                else if (k->key() == Qt::Key_Down)
                    res = focusNextPrevChild(true);
            } else if (QApplication::navigationMode() == Qt::NavigationModeKeypadDirectional) {
                if (k->key() == Qt::Key_Up)
                    res = QWidgetPrivate::navigateToDirection(QWidgetPrivate::DirectionNorth);
                else if (k->key() == Qt::Key_Right)
                    res = QWidgetPrivate::navigateToDirection(QWidgetPrivate::DirectionEast);
                else if (k->key() == Qt::Key_Down)
                    res = QWidgetPrivate::navigateToDirection(QWidgetPrivate::DirectionSouth);
                else if (k->key() == Qt::Key_Left)
                    res = QWidgetPrivate::navigateToDirection(QWidgetPrivate::DirectionWest);
            }
            if (res) {
                k->accept();
                break;
            }
        }
#endif
#ifndef QT_NO_WHATSTHIS
        if (!k->isAccepted()
            && k->modifiers() & Qt::ShiftModifier && k->key() == Qt::Key_F1
            && d->whatsThis.size()) {
            QWhatsThis::showText(mapToGlobal(inputMethodQuery(Qt::ImMicroFocus).toRect().center()), d->whatsThis, this);
            k->accept();
        }
#endif
    }
        break;

    case QEvent::KeyRelease:
        keyReleaseEvent((QKeyEvent*)event);
        // fall through
    case QEvent::ShortcutOverride:
        break;

    case QEvent::InputMethod:
        inputMethodEvent((QInputMethodEvent *) event);
        break;

    case QEvent::PolishRequest:
        ensurePolished();
        break;

    case QEvent::Polish: {
        style()->polish(this);
        setAttribute(Qt::WA_WState_Polished);
        if (!QApplication::font(this).isCopyOf(QApplication::font()))
            d->resolveFont();
        if (!QApplication::palette(this).isCopyOf(QApplication::palette()))
            d->resolvePalette();
#ifdef QT3_SUPPORT
        if(d->sendChildEvents)
            QApplication::sendPostedEvents(this, QEvent::ChildInserted);
#endif
    }
        break;

    case QEvent::ApplicationWindowIconChange:
        if (isWindow() && !testAttribute(Qt::WA_SetWindowIcon)) {
            d->setWindowIcon_sys();
            d->setWindowIcon_helper();
        }
        break;
    case QEvent::FocusIn:
#ifdef QT_SOFTKEYS_ENABLED
        QSoftKeyManager::updateSoftKeys();
#endif
        focusInEvent((QFocusEvent*)event);
        break;

    case QEvent::FocusOut:
        focusOutEvent((QFocusEvent*)event);
        break;

    case QEvent::Enter:
#ifndef QT_NO_STATUSTIP
        if (d->statusTip.size()) {
            QStatusTipEvent tip(d->statusTip);
            QApplication::sendEvent(const_cast<QWidget *>(this), &tip);
        }
#endif
        enterEvent(event);
        break;

    case QEvent::Leave:
#ifndef QT_NO_STATUSTIP
        if (d->statusTip.size()) {
            QString empty;
            QStatusTipEvent tip(empty);
            QApplication::sendEvent(const_cast<QWidget *>(this), &tip);
        }
#endif
        leaveEvent(event);
        break;

    case QEvent::HoverEnter:
    case QEvent::HoverLeave:
        update();
        break;

    case QEvent::Paint:
        // At this point the event has to be delivered, regardless
        // whether the widget isVisible() or not because it
        // already went through the filters
        paintEvent((QPaintEvent*)event);
        break;

    case QEvent::Move:
        moveEvent((QMoveEvent*)event);
        break;

    case QEvent::Resize:
        resizeEvent((QResizeEvent*)event);
        break;

    case QEvent::Close:
        closeEvent((QCloseEvent *)event);
        break;

#ifndef QT_NO_CONTEXTMENU
    case QEvent::ContextMenu:
        switch (data->context_menu_policy) {
        case Qt::PreventContextMenu:
            break;
        case Qt::DefaultContextMenu:
            contextMenuEvent(static_cast<QContextMenuEvent *>(event));
            break;
        case Qt::CustomContextMenu:
            emit customContextMenuRequested(static_cast<QContextMenuEvent *>(event)->pos());
            break;
#ifndef QT_NO_MENU
        case Qt::ActionsContextMenu:
            if (d->actions.count()) {
                QMenu::exec(d->actions, static_cast<QContextMenuEvent *>(event)->globalPos(),
                            0, this);
                break;
            }
            // fall through
#endif
        default:
            event->ignore();
            break;
        }
        break;
#endif // QT_NO_CONTEXTMENU

#ifndef QT_NO_DRAGANDDROP
    case QEvent::Drop:
        dropEvent((QDropEvent*) event);
        break;

    case QEvent::DragEnter:
        dragEnterEvent((QDragEnterEvent*) event);
        break;

    case QEvent::DragMove:
        dragMoveEvent((QDragMoveEvent*) event);
        break;

    case QEvent::DragLeave:
        dragLeaveEvent((QDragLeaveEvent*) event);
        break;
#endif

    case QEvent::Show:
        showEvent((QShowEvent*) event);
        break;

    case QEvent::Hide:
        hideEvent((QHideEvent*) event);
        break;

    case QEvent::ShowWindowRequest:
        if (!isHidden())
            d->show_sys();
        break;

    case QEvent::ApplicationFontChange:
        d->resolveFont();
        break;
    case QEvent::ApplicationPaletteChange:
        if (!(windowType() == Qt::Desktop))
            d->resolvePalette();
        break;

    case QEvent::ToolBarChange:
    case QEvent::ActivationChange:
    case QEvent::EnabledChange:
    case QEvent::FontChange:
    case QEvent::StyleChange:
    case QEvent::PaletteChange:
    case QEvent::WindowTitleChange:
    case QEvent::IconTextChange:
    case QEvent::ModifiedChange:
    case QEvent::MouseTrackingChange:
    case QEvent::ParentChange:
    case QEvent::WindowStateChange:
    case QEvent::LocaleChange:
    case QEvent::MacSizeChange:
    case QEvent::ContentsRectChange:
        changeEvent(event);
        break;

    case QEvent::WindowActivate:
    case QEvent::WindowDeactivate: {
#ifdef QT3_SUPPORT
        windowActivationChange(event->type() != QEvent::WindowActivate);
#endif
        if (isVisible() && !palette().isEqual(QPalette::Active, QPalette::Inactive))
            update();
        QList<QObject*> childList = d->children;
        for (int i = 0; i < childList.size(); ++i) {
            QWidget *w = qobject_cast<QWidget *>(childList.at(i));
            if (w && w->isVisible() && !w->isWindow())
                QApplication::sendEvent(w, event);
        }

#ifdef QT_SOFTKEYS_ENABLED
        if (isWindow())
            QSoftKeyManager::updateSoftKeys();
#endif

        break; }

    case QEvent::LanguageChange:
#ifdef QT3_SUPPORT
        languageChange();
#endif
        changeEvent(event);
        {
            QList<QObject*> childList = d->children;
            for (int i = 0; i < childList.size(); ++i) {
                QObject *o = childList.at(i);
                if (o)
                    QApplication::sendEvent(o, event);
            }
        }
        update();
        break;

    case QEvent::ApplicationLayoutDirectionChange:
        d->resolveLayoutDirection();
        break;

    case QEvent::LayoutDirectionChange:
        if (d->layout)
            d->layout->invalidate();
        update();
        changeEvent(event);
        break;
    case QEvent::UpdateRequest:
        d->syncBackingStore();
        break;
    case QEvent::UpdateLater:
        update(static_cast<QUpdateLaterEvent*>(event)->region());
        break;

    case QEvent::WindowBlocked:
    case QEvent::WindowUnblocked:
        {
            QList<QObject*> childList = d->children;
            for (int i = 0; i < childList.size(); ++i) {
                QObject *o = childList.at(i);
                if (o && o != QApplication::activeModalWidget()) {
                    if (qobject_cast<QWidget *>(o) && static_cast<QWidget *>(o)->isWindow()) {
                        // do not forward the event to child windows,
                        // QApplication does this for us
                        continue;
                    }
                    QApplication::sendEvent(o, event);
                }
            }
#if defined(Q_WS_WIN)
            setDisabledStyle(this, (event->type() == QEvent::WindowBlocked));
#endif
        }
        break;
#ifndef QT_NO_TOOLTIP
    case QEvent::ToolTip:
        if (!d->toolTip.isEmpty())
            QToolTip::showText(static_cast<QHelpEvent*>(event)->globalPos(), d->toolTip, this);
        else
            event->ignore();
        break;
#endif
#ifndef QT_NO_WHATSTHIS
    case QEvent::WhatsThis:
        if (d->whatsThis.size())
            QWhatsThis::showText(static_cast<QHelpEvent *>(event)->globalPos(), d->whatsThis, this);
        else
            event->ignore();
        break;
    case QEvent::QueryWhatsThis:
        if (d->whatsThis.isEmpty())
            event->ignore();
        break;
#endif
#ifndef QT_NO_ACCESSIBILITY
    case QEvent::AccessibilityDescription:
    case QEvent::AccessibilityHelp: {
        QAccessibleEvent *ev = static_cast<QAccessibleEvent *>(event);
        if (ev->child())
            return false;
        switch (ev->type()) {
#ifndef QT_NO_TOOLTIP
        case QEvent::AccessibilityDescription:
            ev->setValue(d->toolTip);
            break;
#endif
#ifndef QT_NO_WHATSTHIS
        case QEvent::AccessibilityHelp:
            ev->setValue(d->whatsThis);
            break;
#endif
        default:
            return false;
        }
        break; }
#endif
    case QEvent::EmbeddingControl:
        d->topData()->frameStrut.setCoords(0 ,0, 0, 0);
        data->fstrut_dirty = false;
#if defined(Q_WS_WIN) || defined(Q_WS_X11)
        d->topData()->embedded = 1;
#endif
        break;
#ifndef QT_NO_ACTION
    case QEvent::ActionAdded:
    case QEvent::ActionRemoved:
    case QEvent::ActionChanged:
#ifdef QT_SOFTKEYS_ENABLED
        QSoftKeyManager::updateSoftKeys();
#endif
        actionEvent((QActionEvent*)event);
        break;
#endif

    case QEvent::KeyboardLayoutChange:
        {
            changeEvent(event);

            // inform children of the change
            QList<QObject*> childList = d->children;
            for (int i = 0; i < childList.size(); ++i) {
                QWidget *w = qobject_cast<QWidget *>(childList.at(i));
                if (w && w->isVisible() && !w->isWindow())
                    QApplication::sendEvent(w, event);
            }
            break;
        }
#ifdef Q_WS_MAC
    case QEvent::MacGLWindowChange:
        d->needWindowChange = false;
        break;
#endif
    case QEvent::TouchBegin:
    case QEvent::TouchUpdate:
    case QEvent::TouchEnd:
    {
#ifndef Q_WS_MAC
        QTouchEvent *touchEvent = static_cast<QTouchEvent *>(event);
        const QTouchEvent::TouchPoint &touchPoint = touchEvent->touchPoints().first();
        if (touchPoint.isPrimary() || touchEvent->deviceType() == QTouchEvent::TouchPad)
            break;

        // fake a mouse event!
        QEvent::Type eventType = QEvent::None;
        switch (touchEvent->type()) {
        case QEvent::TouchBegin:
            eventType = QEvent::MouseButtonPress;
            break;
        case QEvent::TouchUpdate:
            eventType = QEvent::MouseMove;
            break;
        case QEvent::TouchEnd:
            eventType = QEvent::MouseButtonRelease;
            break;
        default:
            Q_ASSERT(!true);
            break;
        }
        if (eventType == QEvent::None)
            break;

        QMouseEvent mouseEvent(eventType,
                               touchPoint.pos().toPoint(),
                               touchPoint.screenPos().toPoint(),
                               Qt::LeftButton,
                               Qt::LeftButton,
                               touchEvent->modifiers());
        (void) QApplication::sendEvent(this, &mouseEvent);
#endif // Q_WS_MAC
        break;
    }
#ifndef QT_NO_GESTURES
    case QEvent::Gesture:
        event->ignore();
        break;
#endif
#ifndef QT_NO_PROPERTIES
    case QEvent::DynamicPropertyChange: {
        const QByteArray &propName = static_cast<QDynamicPropertyChangeEvent *>(event)->propertyName();
        if (!qstrncmp(propName, "_q_customDpi", 12) && propName.length() == 13) {
            uint value = property(propName.constData()).toUInt();
            if (!d->extra)
                d->createExtra();
            const char axis = propName.at(12);
            if (axis == 'X')
                d->extra->customDpiX = value;
            else if (axis == 'Y')
                d->extra->customDpiY = value;
            d->updateFont(d->data.fnt);
        }
        // fall through
    }
#endif
    default:
        return QObject::event(event);
    }
    return true;
}

void QWidget::changeEvent(QEvent * event)
{
    switch(event->type()) {
    case QEvent::EnabledChange:
        update();
#ifndef QT_NO_ACCESSIBILITY
        QAccessible::updateAccessibility(this, 0, QAccessible::StateChanged);
#endif
        break;

    case QEvent::FontChange:
    case QEvent::StyleChange: {
        Q_D(QWidget);
        update();
        updateGeometry();
        if (d->layout)
            d->layout->invalidate();
#ifdef Q_WS_QWS
        if (isWindow())
            d->data.fstrut_dirty = true;
#endif
        break;
    }

    case QEvent::PaletteChange:
        update();
        break;

#ifdef Q_WS_MAC
    case QEvent::MacSizeChange:
        updateGeometry();
        break;
    case QEvent::ToolTipChange:
    case QEvent::MouseTrackingChange:
        qt_mac_update_mouseTracking(this);
        break;
#endif

    default:
        break;
    }
}

void QWidget::mouseMoveEvent(QMouseEvent *event)
{
    event->ignore();
}

void QWidget::mousePressEvent(QMouseEvent *event)
{
    event->ignore();
    if ((windowType() == Qt::Popup)) {
        event->accept();
        QWidget* w;
        while ((w = QApplication::activePopupWidget()) && w != this){
            w->close();
            if (QApplication::activePopupWidget() == w) // widget does not want to disappear
                w->hide(); // hide at least
        }
        if (!rect().contains(event->pos())){
            close();
        }
    }
}

void QWidget::mouseReleaseEvent(QMouseEvent *event)
{
    event->ignore();
}

void QWidget::mouseDoubleClickEvent(QMouseEvent *event)
{
    mousePressEvent(event);                        // try mouse press event
}

#ifndef QT_NO_WHEELEVENT

void QWidget::wheelEvent(QWheelEvent *event)
{
    event->ignore();
}
#endif // QT_NO_WHEELEVENT

#ifndef QT_NO_TABLETEVENT

void QWidget::tabletEvent(QTabletEvent *event)
{
    event->ignore();
}
#endif // QT_NO_TABLETEVENT

void QWidget::keyPressEvent(QKeyEvent *event)
{
    if ((windowType() == Qt::Popup) && event->key() == Qt::Key_Escape) {
        event->accept();
        close();
    } else {
        event->ignore();
    }
}

void QWidget::keyReleaseEvent(QKeyEvent *event)
{
    event->ignore();
}

void QWidget::focusInEvent(QFocusEvent *)
{
    if (focusPolicy() != Qt::NoFocus || !isWindow()) {
        update();
    }
}

void QWidget::focusOutEvent(QFocusEvent *)
{
    if (focusPolicy() != Qt::NoFocus || !isWindow())
        update();
}

void QWidget::enterEvent(QEvent *)
{
}

void QWidget::leaveEvent(QEvent *)
{
}

void QWidget::paintEvent(QPaintEvent *)
{
}


void QWidget::moveEvent(QMoveEvent *)
{
}


void QWidget::resizeEvent(QResizeEvent * /* event */)
{
}

#ifndef QT_NO_ACTION

void QWidget::actionEvent(QActionEvent *)
{

}
#endif

void QWidget::closeEvent(QCloseEvent *event)
{
    event->accept();
}

#ifndef QT_NO_CONTEXTMENU

void QWidget::contextMenuEvent(QContextMenuEvent *event)
{
    event->ignore();
}
#endif // QT_NO_CONTEXTMENU


void QWidget::inputMethodEvent(QInputMethodEvent *event)
{
    event->ignore();
}

QVariant QWidget::inputMethodQuery(Qt::InputMethodQuery query) const
{
    switch(query) {
    case Qt::ImMicroFocus:
        return QRect(width()/2, 0, 1, height());
    case Qt::ImFont:
        return font();
    case Qt::ImAnchorPosition:
        // Fallback.
        return inputMethodQuery(Qt::ImCursorPosition);
    default:
        return QVariant();
    }
}

Qt::InputMethodHints QWidget::inputMethodHints() const
{
#ifndef QT_NO_IM
    const QWidgetPrivate *priv = d_func();
    while (priv->inheritsInputMethodHints) {
        priv = priv->q_func()->parentWidget()->d_func();
        Q_ASSERT(priv);
    }
    return priv->imHints;
#else //QT_NO_IM
    return 0;
#endif //QT_NO_IM
}

void QWidget::setInputMethodHints(Qt::InputMethodHints hints)
{
#ifndef QT_NO_IM
    Q_D(QWidget);
    if (d->imHints == hints)
        return;
    d->imHints = hints;
    // Optimization to update input context only it has already been created.
    if (d->ic || qApp->d_func()->inputContext) {
        QInputContext *ic = inputContext();
        if (ic)
            ic->update();
    }
#endif //QT_NO_IM
}


#ifndef QT_NO_DRAGANDDROP

void QWidget::dragEnterEvent(QDragEnterEvent *)
{
}

void QWidget::dragMoveEvent(QDragMoveEvent *)
{
}

void QWidget::dragLeaveEvent(QDragLeaveEvent *)
{
}

void QWidget::dropEvent(QDropEvent *)
{
}

#endif // QT_NO_DRAGANDDROP

void QWidget::showEvent(QShowEvent *)
{
}

void QWidget::hideEvent(QHideEvent *)
{
}

/*
    \fn QWidget::x11Event(MSG *)

    This special event handler can be reimplemented in a subclass to receive
    native X11 events.

    In your reimplementation of this function, if you want to stop Qt from
    handling the event, return true. If you return false, this native event
    is passed back to Qt, which translates it into a Qt event and sends it to
    the widget.

    \note Events are only delivered to this event handler if the widget is
    native.

    \warning This function is not portable.

    \sa QApplication::x11EventFilter(), QWidget::winId()
*/


#if defined(Q_WS_MAC)

bool QWidget::macEvent(EventHandlerCallRef, EventRef)
{
    return false;
}

#endif
#if defined(Q_WS_WIN)

bool QWidget::winEvent(MSG *message, long *result)
{
    Q_UNUSED(message);
    Q_UNUSED(result);
    return false;
}

#endif
#if defined(Q_WS_X11)

bool QWidget::x11Event(XEvent *)
{
    return false;
}

#endif
#if defined(Q_WS_QWS)

bool QWidget::qwsEvent(QWSEvent *)
{
    return false;
}

#endif


void QWidget::ensurePolished() const
{
    Q_D(const QWidget);

    const QMetaObject *m = metaObject();
    if (m == d->polished)
        return;
    d->polished = m;

    QEvent e(QEvent::Polish);
    QCoreApplication::sendEvent(const_cast<QWidget *>(this), &e);

    // polish children after 'this'
    QList<QObject*> children = d->children;
    for (int i = 0; i < children.size(); ++i) {
        QObject *o = children.at(i);
        if(!o->isWidgetType())
            continue;
        if (QWidget *w = qobject_cast<QWidget *>(o))
            w->ensurePolished();
    }

    if (d->parent && d->sendChildEvents) {
        QChildEvent e(QEvent::ChildPolished, const_cast<QWidget *>(this));
        QCoreApplication::sendEvent(d->parent, &e);
    }
}

QRegion QWidget::mask() const
{
    Q_D(const QWidget);
    return d->extra ? d->extra->mask : QRegion();
}

QLayout *QWidget::layout() const
{
    return d_func()->layout;
}


void QWidget::setLayout(QLayout *l)
{
    if (!l) {
        qWarning("QWidget::setLayout: Cannot set layout to 0");
        return;
    }
    if (layout()) {
        if (layout() != l)
            qWarning("QWidget::setLayout: Attempting to set QLayout \"%s\" on %s \"%s\", which already has a"
                     " layout", l->objectName().toLocal8Bit().data(), metaObject()->className(),
                     objectName().toLocal8Bit().data());
        return;
    }

    QObject *oldParent = l->parent();
    if (oldParent && oldParent != this) {
        if (oldParent->isWidgetType()) {
            // Steal the layout off a widget parent. Takes effect when
            // morphing laid-out container widgets in Designer.
            QWidget *oldParentWidget = static_cast<QWidget *>(oldParent);
            oldParentWidget->takeLayout();
        } else {
            qWarning("QWidget::setLayout: Attempting to set QLayout \"%s\" on %s \"%s\", when the QLayout already has a parent",
                     l->objectName().toLocal8Bit().data(), metaObject()->className(),
                     objectName().toLocal8Bit().data());
            return;
        }
    }

    Q_D(QWidget);
    l->d_func()->topLevel = true;
    d->layout = l;
    if (oldParent != this) {
        l->setParent(this);
        l->d_func()->reparentChildWidgets(this);
        l->invalidate();
    }

    if (isWindow() && d->maybeTopData())
        d->topData()->sizeAdjusted = false;
}

QLayout *QWidget::takeLayout()
{
    Q_D(QWidget);
    QLayout *l =  layout();
    if (!l)
        return 0;
    d->layout = 0;
    l->setParent(0);
    return l;
}

QSizePolicy QWidget::sizePolicy() const
{
    Q_D(const QWidget);
    return d->size_policy;
}

void QWidget::setSizePolicy(QSizePolicy policy)
{
    Q_D(QWidget);
    setAttribute(Qt::WA_WState_OwnSizePolicy);
    if (policy == d->size_policy)
        return;
    d->size_policy = policy;

#ifndef QT_NO_GRAPHICSVIEW
    if (QWExtra *extra = d->extra) {
        if (extra->proxyWidget)
            extra->proxyWidget->setSizePolicy(policy);
    }
#endif

    updateGeometry();

    if (isWindow() && d->maybeTopData())
        d->topData()->sizeAdjusted = false;
}

int QWidget::heightForWidth(int w) const
{
    if (layout() && layout()->hasHeightForWidth())
        return layout()->totalHeightForWidth(w);
    return -1;
}


bool QWidgetPrivate::hasHeightForWidth() const
{
    return layout ? layout->hasHeightForWidth() : size_policy.hasHeightForWidth();
}

QWidget *QWidget::childAt(const QPoint &p) const
{
    return d_func()->childAt_helper(p, false);
}

QWidget *QWidgetPrivate::childAt_helper(const QPoint &p, bool ignoreChildrenInDestructor) const
{
    if (children.isEmpty())
        return 0;

#ifdef Q_WS_MAC
    Q_Q(const QWidget);
    // Unified tool bars on the Mac require special handling since they live outside
    // QMainWindow's geometry(). See commit: 35667fd45ada49269a5987c235fdedfc43e92bb8
    bool includeFrame = q->isWindow() && qobject_cast<const QMainWindow *>(q)
                        && static_cast<const QMainWindow *>(q)->unifiedTitleAndToolBarOnMac();
    if (includeFrame)
        return childAtRecursiveHelper(p, ignoreChildrenInDestructor, includeFrame);
#endif

    if (!pointInsideRectAndMask(p))
        return 0;
    return childAtRecursiveHelper(p, ignoreChildrenInDestructor);
}

QWidget *QWidgetPrivate::childAtRecursiveHelper(const QPoint &p, bool ignoreChildrenInDestructor, bool includeFrame) const
{
#ifndef Q_WS_MAC
    Q_UNUSED(includeFrame);
#endif
    for (int i = children.size() - 1; i >= 0; --i) {
        QWidget *child = qobject_cast<QWidget *>(children.at(i));
        if (!child || child->isWindow() || child->isHidden() || child->testAttribute(Qt::WA_TransparentForMouseEvents)
            || (ignoreChildrenInDestructor && child->data->in_destructor)) {
            continue;
        }

        // Map the point 'p' from parent coordinates to child coordinates.
        QPoint childPoint = p;
#ifdef Q_WS_MAC
        // 'includeFrame' is true if the child's parent is a top-level QMainWindow with an unified tool bar.
        // An unified tool bar on the Mac lives outside QMainWindow's geometry(), so a normal
        // QWidget::mapFromParent won't do the trick.
        if (includeFrame && qobject_cast<QToolBar *>(child))
            childPoint = qt_mac_nativeMapFromParent(child, p);
        else
#endif
        childPoint -= child->data->crect.topLeft();

        // Check if the point hits the child.
        if (!child->d_func()->pointInsideRectAndMask(childPoint))
            continue;

        // Do the same for the child's descendants.
        if (QWidget *w = child->d_func()->childAtRecursiveHelper(childPoint, ignoreChildrenInDestructor))
            return w;

        // We have found our target; namely the child at position 'p'.
        return child;
    }
    return 0;
}

void QWidgetPrivate::updateGeometry_helper(bool forceUpdate)
{
    Q_Q(QWidget);
    if (widgetItem)
        widgetItem->invalidateSizeCache();
    QWidget *parent;
    if (forceUpdate || !extra || extra->minw != extra->maxw || extra->minh != extra->maxh) {
        if (!q->isWindow() && !q->isHidden() && (parent = q->parentWidget())) {
            if (parent->d_func()->layout)
                parent->d_func()->layout->invalidate();
            else if (parent->isVisible())
                QApplication::postEvent(parent, new QEvent(QEvent::LayoutRequest));
        }
    }
}

void QWidget::updateGeometry()
{
    Q_D(QWidget);
    d->updateGeometry_helper(false);
}

void QWidget::setWindowFlags(Qt::WindowFlags flags)
{
    if (data->window_flags == flags)
        return;

    Q_D(QWidget);

    if ((data->window_flags | flags) & Qt::Window) {
        // the old type was a window and/or the new type is a window
        QPoint oldPos = pos();
        bool visible = isVisible();
        setParent(parentWidget(), flags);

        // if both types are windows or neither of them are, we restore
        // the old position
        if (!((data->window_flags ^ flags) & Qt::Window)
            && (visible || testAttribute(Qt::WA_Moved))) {
            move(oldPos);
        }
        // for backward-compatibility we change Qt::WA_QuitOnClose attribute value only when the window was recreated.
        d->adjustQuitOnCloseAttribute();
    } else {
        data->window_flags = flags;
    }
}

void QWidget::overrideWindowFlags(Qt::WindowFlags flags)
{
    data->window_flags = flags;
}

void QWidget::setParent(QWidget *parent)
{
    if (parent == parentWidget())
        return;
    setParent((QWidget*)parent, windowFlags() & ~Qt::WindowType_Mask);
}

void QWidget::setParent(QWidget *parent, Qt::WindowFlags f)
{
    Q_D(QWidget);
    d->inSetParent = true;
    bool resized = testAttribute(Qt::WA_Resized);
    bool wasCreated = testAttribute(Qt::WA_WState_Created);
    QWidget *oldtlw = window();

    QWidget *desktopWidget = 0;
    if (parent && parent->windowType() == Qt::Desktop)
        desktopWidget = parent;
    bool newParent = (parent != parentWidget()) || !wasCreated || desktopWidget;

#if defined(Q_WS_X11) || defined(Q_WS_WIN) || defined(Q_WS_MAC) || defined(Q_OS_SYMBIAN)
    if (newParent && parent && !desktopWidget) {
        if (testAttribute(Qt::WA_NativeWindow) && !qApp->testAttribute(Qt::AA_DontCreateNativeWidgetSiblings)
#if defined(Q_WS_MAC) && defined(QT_MAC_USE_COCOA)
            // On Mac, toolbars inside the unified title bar will never overlap with
            // siblings in the content view. So we skip enforce native siblings in that case
            && !d->isInUnifiedToolbar && parentWidget() && parentWidget()->isWindow()
#endif // Q_WS_MAC && QT_MAC_USE_COCOA
        )
            parent->d_func()->enforceNativeChildren();
        else if (parent->d_func()->nativeChildrenForced() || parent->testAttribute(Qt::WA_PaintOnScreen))
            setAttribute(Qt::WA_NativeWindow);
    }
#endif

    if (wasCreated) {
        if (!testAttribute(Qt::WA_WState_Hidden)) {
            hide();
            setAttribute(Qt::WA_WState_ExplicitShowHide, false);
        }
        if (newParent) {
            QEvent e(QEvent::ParentAboutToChange);
            QApplication::sendEvent(this, &e);
        }
    }
    if (newParent && isAncestorOf(focusWidget()))
        focusWidget()->clearFocus();

    QTLWExtra *oldTopExtra = window()->d_func()->maybeTopData();
    QWidgetBackingStoreTracker *oldBsTracker = oldTopExtra ? &oldTopExtra->backingStore : 0;

    d->setParent_sys(parent, f);

    QTLWExtra *topExtra = window()->d_func()->maybeTopData();
    QWidgetBackingStoreTracker *bsTracker = topExtra ? &topExtra->backingStore : 0;
    if (oldBsTracker && oldBsTracker != bsTracker)
        oldBsTracker->unregisterWidgetSubtree(this);

    if (desktopWidget)
        parent = 0;

#ifdef Q_BACKINGSTORE_SUBSURFACES
    QTLWExtra *extra = d->maybeTopData();
    QWindowSurface *windowSurface = (extra ? extra->windowSurface : 0);
    if (newParent && windowSurface) {
        QWidgetBackingStore *oldBs = oldtlw->d_func()->maybeBackingStore();
        if (oldBs)
            oldBs->subSurfaces.removeAll(windowSurface);

        if (parent) {
            QWidgetBackingStore *newBs = parent->d_func()->maybeBackingStore();
            if (newBs)
                newBs->subSurfaces.append(windowSurface);
        }
    }
#endif

    if (QWidgetBackingStore *oldBs = oldtlw->d_func()->maybeBackingStore()) {
        if (newParent)
            oldBs->removeDirtyWidget(this);
        // Move the widget and all its static children from
        // the old backing store to the new one.
        oldBs->moveStaticWidgets(this);
    }

    if ((QApplicationPrivate::app_compile_version < 0x040200
         || QApplicationPrivate::testAttribute(Qt::AA_ImmediateWidgetCreation))
        && !testAttribute(Qt::WA_WState_Created))
        create();

    d->reparentFocusWidgets(oldtlw);
    setAttribute(Qt::WA_Resized, resized);
    if (!testAttribute(Qt::WA_StyleSheet)
        && (!parent || !parent->testAttribute(Qt::WA_StyleSheet))) {
        d->resolveFont();
        d->resolvePalette();
    }
    d->resolveLayoutDirection();
    d->resolveLocale();

    // Note: GL widgets under WGL or EGL will always need a ParentChange
    // event to handle recreation/rebinding of the GL context, hence the
    // (f & Qt::MSWindowsOwnDC) clause (which is set on QGLWidgets on all
    // platforms).
    if (newParent
#if defined(Q_WS_WIN) || defined(QT_OPENGL_ES)
        || (f & Qt::MSWindowsOwnDC)
#endif
        ) {
        // propagate enabled updates enabled state to non-windows
        if (!isWindow()) {
            if (!testAttribute(Qt::WA_ForceDisabled))
                d->setEnabled_helper(parent ? parent->isEnabled() : true);
            if (!testAttribute(Qt::WA_ForceUpdatesDisabled))
                d->setUpdatesEnabled_helper(parent ? parent->updatesEnabled() : true);
        }
        d->inheritStyle();

        // send and post remaining QObject events
        if (parent && d->sendChildEvents) {
            QChildEvent e(QEvent::ChildAdded, this);
            QApplication::sendEvent(parent, &e);
#ifdef QT3_SUPPORT
            if (parent->d_func()->pendingChildInsertedEvents.isEmpty()) {
                QApplication::postEvent(parent,
                                        new QEvent(QEvent::ChildInsertedRequest),
                                        Qt::HighEventPriority);
            }
            parent->d_func()->pendingChildInsertedEvents.append(this);
#endif
        }

//### already hidden above ---> must probably do something smart on the mac
// #ifdef Q_WS_MAC
//             extern bool qt_mac_is_macdrawer(const QWidget *); //qwidget_mac.cpp
//             if(!qt_mac_is_macdrawer(q)) //special case
//                 q->setAttribute(Qt::WA_WState_Hidden);
// #else
//             q->setAttribute(Qt::WA_WState_Hidden);
//#endif

        if (parent && d->sendChildEvents && d->polished) {
            QChildEvent e(QEvent::ChildPolished, this);
            QCoreApplication::sendEvent(parent, &e);
        }

        QEvent e(QEvent::ParentChange);
        QApplication::sendEvent(this, &e);
    }

    if (!wasCreated) {
        if (isWindow() || parentWidget()->isVisible())
            setAttribute(Qt::WA_WState_Hidden, true);
        else if (!testAttribute(Qt::WA_WState_ExplicitShowHide))
            setAttribute(Qt::WA_WState_Hidden, false);
    }

    d->updateIsOpaque();

#ifndef QT_NO_GRAPHICSVIEW
    // Embed the widget into a proxy if the parent is embedded.
    // ### Doesn't handle reparenting out of an embedded widget.
    if (oldtlw->graphicsProxyWidget()) {
        if (QGraphicsProxyWidget *ancestorProxy = d->nearestGraphicsProxyWidget(oldtlw))
            ancestorProxy->d_func()->unembedSubWindow(this);
    }
    if (isWindow() && parent && !graphicsProxyWidget() && !bypassGraphicsProxyWidget(this)) {
        if (QGraphicsProxyWidget *ancestorProxy = d->nearestGraphicsProxyWidget(parent))
            ancestorProxy->d_func()->embedSubWindow(this);
    }
#endif

    d->inSetParent = false;
}

void QWidget::scroll(int dx, int dy)
{
    if ((!updatesEnabled() && children().size() == 0) || !isVisible())
        return;
    if (dx == 0 && dy == 0)
        return;
    Q_D(QWidget);
#ifndef QT_NO_GRAPHICSVIEW
    if (QGraphicsProxyWidget *proxy = QWidgetPrivate::nearestGraphicsProxyWidget(this)) {
        // Graphics View maintains its own dirty region as a list of rects;
        // until we can connect item updates directly to the view, we must
        // separately add a translated dirty region.
        if (!d->dirty.isEmpty()) {
            foreach (const QRect &rect, (d->dirty.translated(dx, dy)).rects())
                proxy->update(rect);
        }
        proxy->scroll(dx, dy, proxy->subWidgetRect(this));
        return;
    }
#endif
    d->setDirtyOpaqueRegion();
    d->scroll_sys(dx, dy);
}

void QWidget::scroll(int dx, int dy, const QRect &r)
{

    if ((!updatesEnabled() && children().size() == 0) || !isVisible())
        return;
    if (dx == 0 && dy == 0)
        return;
    Q_D(QWidget);
#ifndef QT_NO_GRAPHICSVIEW
    if (QGraphicsProxyWidget *proxy = QWidgetPrivate::nearestGraphicsProxyWidget(this)) {
        // Graphics View maintains its own dirty region as a list of rects;
        // until we can connect item updates directly to the view, we must
        // separately add a translated dirty region.
        if (!d->dirty.isEmpty()) {
            foreach (const QRect &rect, (d->dirty.translated(dx, dy) & r).rects())
                proxy->update(rect);
        }
        proxy->scroll(dx, dy, r.translated(proxy->subWidgetRect(this).topLeft().toPoint()));
        return;
    }
#endif
    d->scroll_sys(dx, dy, r);
}

void QWidget::repaint()
{
    repaint(rect());
}

void QWidget::repaint(int x, int y, int w, int h)
{
    if (x > data->crect.width() || y > data->crect.height())
        return;

    if (w < 0)
        w = data->crect.width()  - x;
    if (h < 0)
        h = data->crect.height() - y;

    repaint(QRect(x, y, w, h));
}

void QWidget::repaint(const QRect &rect)
{
    Q_D(QWidget);

    if (testAttribute(Qt::WA_WState_ConfigPending)) {
        update(rect);
        return;
    }

    if (!isVisible() || !updatesEnabled() || rect.isEmpty())
        return;

    if (hasBackingStoreSupport()) {
#ifdef QT_MAC_USE_COCOA
        if (qt_widget_private(this)->isInUnifiedToolbar) {
            qt_widget_private(this)->unifiedSurface->renderToolbar(this, true);
            return;
        }
#endif // QT_MAC_USE_COCOA
        QTLWExtra *tlwExtra = window()->d_func()->maybeTopData();
        if (tlwExtra && !tlwExtra->inTopLevelResize && tlwExtra->backingStore) {
            tlwExtra->inRepaint = true;
            tlwExtra->backingStore->markDirty(rect, this, true);
            tlwExtra->inRepaint = false;
        }
    } else {
        d->repaint_sys(rect);
    }
}

void QWidget::repaint(const QRegion &rgn)
{
    Q_D(QWidget);

    if (testAttribute(Qt::WA_WState_ConfigPending)) {
        update(rgn);
        return;
    }

    if (!isVisible() || !updatesEnabled() || rgn.isEmpty())
        return;

    if (hasBackingStoreSupport()) {
#ifdef QT_MAC_USE_COCOA
        if (qt_widget_private(this)->isInUnifiedToolbar) {
            qt_widget_private(this)->unifiedSurface->renderToolbar(this, true);
            return;
        }
#endif // QT_MAC_USE_COCOA
        QTLWExtra *tlwExtra = window()->d_func()->maybeTopData();
        if (tlwExtra && !tlwExtra->inTopLevelResize && tlwExtra->backingStore) {
            tlwExtra->inRepaint = true;
            tlwExtra->backingStore->markDirty(rgn, this, true);
            tlwExtra->inRepaint = false;
        }
    } else {
        d->repaint_sys(rgn);
    }
}

void QWidget::update()
{
    update(rect());
}

void QWidget::update(const QRect &rect)
{
    if (!isVisible() || !updatesEnabled())
        return;

    QRect r = rect & QWidget::rect();

    if (r.isEmpty())
        return;

    if (testAttribute(Qt::WA_WState_InPaintEvent)) {
        QApplication::postEvent(this, new QUpdateLaterEvent(r));
        return;
    }

    if (hasBackingStoreSupport()) {
#ifdef QT_MAC_USE_COCOA
        if (qt_widget_private(this)->isInUnifiedToolbar) {
            qt_widget_private(this)->unifiedSurface->renderToolbar(this, true);
            return;
        }
#endif // QT_MAC_USE_COCOA
        QTLWExtra *tlwExtra = window()->d_func()->maybeTopData();
        if (tlwExtra && !tlwExtra->inTopLevelResize && tlwExtra->backingStore)
            tlwExtra->backingStore->markDirty(r, this);
    } else {
        d_func()->repaint_sys(r);
    }
}

void QWidget::update(const QRegion &rgn)
{
    if (!isVisible() || !updatesEnabled() || rgn.isEmpty())
        return;

    QRegion r = rgn & QWidget::rect();

    if (r.isEmpty())
        return;

    if (testAttribute(Qt::WA_WState_InPaintEvent)) {
        QApplication::postEvent(this, new QUpdateLaterEvent(r));
        return;
    }

    if (hasBackingStoreSupport()) {
#ifdef QT_MAC_USE_COCOA
        if (qt_widget_private(this)->isInUnifiedToolbar) {
            qt_widget_private(this)->unifiedSurface->renderToolbar(this, true);
            return;
        }
#endif // QT_MAC_USE_COCOA
        QTLWExtra *tlwExtra = window()->d_func()->maybeTopData();
        if (tlwExtra && !tlwExtra->inTopLevelResize && tlwExtra->backingStore)
            tlwExtra->backingStore->markDirty(r, this);
    } else {
        d_func()->repaint_sys(r);
    }
}

#ifdef QT3_SUPPORT

void QWidget::erase_helper(int x, int y, int w, int h)
{
    if (testAttribute(Qt::WA_NoSystemBackground) || testAttribute(Qt::WA_UpdatesDisabled) ||  !testAttribute(Qt::WA_WState_Visible))
        return;
    if (w < 0)
        w = data->crect.width()  - x;
    if (h < 0)
        h = data->crect.height() - y;
    if (w != 0 && h != 0) {
        QPainter p(this);
        p.eraseRect(QRect(x, y, w, h));
    }
}

void QWidget::erase(const QRegion& rgn)
{
    if (testAttribute(Qt::WA_NoSystemBackground) || testAttribute(Qt::WA_UpdatesDisabled) || !testAttribute(Qt::WA_WState_Visible))
        return;

    QPainter p(this);
    p.setClipRegion(rgn);
    p.eraseRect(rgn.boundingRect());
}

void QWidget::drawText_helper(int x, int y, const QString &str)
{
    if(!testAttribute(Qt::WA_WState_Visible))
        return;
    QPainter paint(this);
    paint.drawText(x, y, str);
}


bool QWidget::close(bool alsoDelete)
{
    QPointer<QWidget> that = this;
    bool accepted = close();
    if (alsoDelete && accepted && that)
        deleteLater();
    return accepted;
}

void QWidget::setIcon(const QPixmap &i)
{
    setWindowIcon(i);
}

const QPixmap *QWidget::icon() const
{
    Q_D(const QWidget);
    return (d->extra && d->extra->topextra) ? d->extra->topextra->iconPixmap : 0;
}

#endif // QT3_SUPPORT

static void setAttribute_internal(Qt::WidgetAttribute attribute, bool on, QWidgetData *data,
                                  QWidgetPrivate *d)
{
    if (attribute < int(8*sizeof(uint))) {
        if (on)
            data->widget_attributes |= (1<<attribute);
        else
            data->widget_attributes &= ~(1<<attribute);
    } else {
        const int x = attribute - 8*sizeof(uint);
        const int int_off = x / (8*sizeof(uint));
        if (on)
            d->high_attributes[int_off] |= (1<<(x-(int_off*8*sizeof(uint))));
        else
            d->high_attributes[int_off] &= ~(1<<(x-(int_off*8*sizeof(uint))));
    }
}

void QWidget::setAttribute(Qt::WidgetAttribute attribute, bool on)
{
    if (testAttribute(attribute) == on)
        return;

    Q_D(QWidget);
    Q_ASSERT_X(sizeof(d->high_attributes)*8 >= (Qt::WA_AttributeCount - sizeof(uint)*8),
               "QWidget::setAttribute(WidgetAttribute, bool)",
               "QWidgetPrivate::high_attributes[] too small to contain all attributes in WidgetAttribute");
#ifdef Q_WS_WIN
    // ### Don't use PaintOnScreen+paintEngine() to do native painting in 5.0
    if (attribute == Qt::WA_PaintOnScreen && on && !inherits("QGLWidget")) {
        // see qwidget_win.cpp, ::paintEngine for details
        paintEngine();
        if (d->noPaintOnScreen)
            return;
    }
#endif

    setAttribute_internal(attribute, on, data, d);

    switch (attribute) {

#ifndef QT_NO_DRAGANDDROP
    case Qt::WA_AcceptDrops:  {
        if (on && !testAttribute(Qt::WA_DropSiteRegistered))
            setAttribute(Qt::WA_DropSiteRegistered, true);
        else if (!on && (isWindow() || !parentWidget() || !parentWidget()->testAttribute(Qt::WA_DropSiteRegistered)))
            setAttribute(Qt::WA_DropSiteRegistered, false);
        QEvent e(QEvent::AcceptDropsChange);
        QApplication::sendEvent(this, &e);
        break;
    }
    case Qt::WA_DropSiteRegistered:  {
        d->registerDropSite(on);
        for (int i = 0; i < d->children.size(); ++i) {
            QWidget *w = qobject_cast<QWidget *>(d->children.at(i));
            if (w && !w->isWindow() && !w->testAttribute(Qt::WA_AcceptDrops) && w->testAttribute(Qt::WA_DropSiteRegistered) != on)
                w->setAttribute(Qt::WA_DropSiteRegistered, on);
        }
        break;
    }
#endif

    case Qt::WA_NoChildEventsForParent:
        d->sendChildEvents = !on;
        break;
    case Qt::WA_NoChildEventsFromChildren:
        d->receiveChildEvents = !on;
        break;
    case Qt::WA_MacBrushedMetal:
#ifdef Q_WS_MAC
        d->setStyle_helper(style(), false, true);  // Make sure things get unpolished/polished correctly.
        // fall through since changing the metal attribute affects the opaque size grip.
    case Qt::WA_MacOpaqueSizeGrip:
        d->macUpdateOpaqueSizeGrip();
        break;
    case Qt::WA_MacShowFocusRect:
        if (hasFocus()) {
            clearFocus();
            setFocus();
        }
        break;
    case Qt::WA_Hover:
        qt_mac_update_mouseTracking(this);
        break;
#endif
    case Qt::WA_MacAlwaysShowToolWindow:
#ifdef Q_WS_MAC
        d->macUpdateHideOnSuspend();
#endif
        break;
    case Qt::WA_MacNormalSize:
    case Qt::WA_MacSmallSize:
    case Qt::WA_MacMiniSize:
#ifdef Q_WS_MAC
        {
            // We can only have one of these set at a time
            const Qt::WidgetAttribute MacSizes[] = { Qt::WA_MacNormalSize, Qt::WA_MacSmallSize,
                                                     Qt::WA_MacMiniSize };
            for (int i = 0; i < 3; ++i) {
                if (MacSizes[i] != attribute)
                    setAttribute_internal(MacSizes[i], false, data, d);
            }
            d->macUpdateSizeAttribute();
        }
#endif
        break;
    case Qt::WA_ShowModal:
        if (!on) {
            if (isVisible())
                QApplicationPrivate::leaveModal(this);
            // reset modality type to Modeless when clearing WA_ShowModal
            data->window_modality = Qt::NonModal;
        } else if (data->window_modality == Qt::NonModal) {
            // determine the modality type if it hasn't been set prior
            // to setting WA_ShowModal. set the default to WindowModal
            // if we are the child of a group leader; otherwise use
            // ApplicationModal.
            QWidget *w = parentWidget();
            if (w)
                w = w->window();
            while (w && !w->testAttribute(Qt::WA_GroupLeader)) {
                w = w->parentWidget();
                if (w)
                    w = w->window();
            }
            data->window_modality = (w && w->testAttribute(Qt::WA_GroupLeader))
                                    ? Qt::WindowModal
                                    : Qt::ApplicationModal;
            // Some window managers does not allow us to enter modal after the
            // window is showing. Therefore, to be consistent, we cannot call
            // QApplicationPrivate::enterModal(this) here. The window must be
            // hidden before changing modality.
        }
        if (testAttribute(Qt::WA_WState_Created)) {
            // don't call setModal_sys() before create_sys()
            d->setModal_sys();
        }
        break;
    case Qt::WA_MouseTracking: {
        QEvent e(QEvent::MouseTrackingChange);
        QApplication::sendEvent(this, &e);
        break; }
    case Qt::WA_NativeWindow: {
#ifndef QT_NO_IM
        QWidget *focusWidget = d->effectiveFocusWidget();
        QInputContext *ic = 0;
        if (on && !internalWinId() && hasFocus()
            && focusWidget->testAttribute(Qt::WA_InputMethodEnabled)) {
            ic = focusWidget->d_func()->inputContext();
            if (ic) {
                ic->reset();
                ic->setFocusWidget(0);
            }
        }
        if (!qApp->testAttribute(Qt::AA_DontCreateNativeWidgetSiblings) && parentWidget()
#if defined(Q_WS_MAC) && defined(QT_MAC_USE_COCOA)
            // On Mac, toolbars inside the unified title bar will never overlap with
            // siblings in the content view. So we skip enforce native siblings in that case
            && !d->isInUnifiedToolbar && parentWidget()->isWindow()
#endif // Q_WS_MAC && QT_MAC_USE_COCOA
        )
            parentWidget()->d_func()->enforceNativeChildren();
        if (on && !internalWinId() && testAttribute(Qt::WA_WState_Created))
            d->createWinId();
        if (ic && isEnabled() && focusWidget->isEnabled()
            && focusWidget->testAttribute(Qt::WA_InputMethodEnabled)) {
            ic->setFocusWidget(focusWidget);
        }
#endif //QT_NO_IM
        break;
    }
    case Qt::WA_PaintOnScreen:
        d->updateIsOpaque();
#if defined(Q_WS_WIN) || defined(Q_WS_X11) || defined(Q_WS_MAC) || defined(Q_OS_SYMBIAN)
        // Recreate the widget if it's already created as an alien widget and
        // WA_PaintOnScreen is enabled. Paint on screen widgets must have win id.
        // So must their children.
        if (on) {
            setAttribute(Qt::WA_NativeWindow);
            d->enforceNativeChildren();
        }
#endif
        // fall through
    case Qt::WA_OpaquePaintEvent:
        d->updateIsOpaque();
        break;
    case Qt::WA_NoSystemBackground:
        d->updateIsOpaque();
        // fall through...
    case Qt::WA_UpdatesDisabled:
        d->updateSystemBackground();
        break;
    case Qt::WA_TransparentForMouseEvents:
#ifdef Q_WS_MAC
        d->macUpdateIgnoreMouseEvents();
#endif
        break;
    case Qt::WA_InputMethodEnabled: {
#ifndef QT_NO_IM
        QWidget *focusWidget = d->effectiveFocusWidget();
        QInputContext *ic = focusWidget->d_func()->assignedInputContext();
        if (!ic && (!on || hasFocus()))
            ic = focusWidget->d_func()->inputContext();
        if (ic) {
            if (on && hasFocus() && ic->focusWidget() != focusWidget && isEnabled()
                && focusWidget->testAttribute(Qt::WA_InputMethodEnabled)) {
                ic->setFocusWidget(focusWidget);
            } else if (!on && ic->focusWidget() == focusWidget) {
                ic->reset();
                ic->setFocusWidget(0);
            }
        }
#endif //QT_NO_IM
        break;
    }
    case Qt::WA_WindowPropagation:
        d->resolvePalette();
        d->resolveFont();
        d->resolveLocale();
        break;
#ifdef Q_WS_X11
    case Qt::WA_NoX11EventCompression:
        if (!d->extra)
            d->createExtra();
        d->extra->compress_events = on;
        break;
    case Qt::WA_X11OpenGLOverlay:
        d->updateIsOpaque();
        break;
    case Qt::WA_X11DoNotAcceptFocus:
        if (testAttribute(Qt::WA_WState_Created))
            d->updateX11AcceptFocus();
        break;
#endif
    case Qt::WA_DontShowOnScreen: {
        if (on && isVisible()) {
            // Make sure we keep the current state and only hide the widget
            // from the desktop. show_sys will only update platform specific
            // attributes at this point.
            d->hide_sys();
#ifdef Q_WS_QWS
            // Release the region for this window from qws if the widget has
            // been shown before the attribute was set.
            if (QWSWindowSurface *surface = static_cast<QWSWindowSurface *>(windowSurface())) {
                QWidget::qwsDisplay()->requestRegion(surface->winId(), surface->key(),
                                                     surface->permanentState(), QRegion());
            }
#endif
            d->show_sys();
        }
        break;
    }

#ifdef Q_WS_X11
    case Qt::WA_X11NetWmWindowTypeDesktop:
    case Qt::WA_X11NetWmWindowTypeDock:
    case Qt::WA_X11NetWmWindowTypeToolBar:
    case Qt::WA_X11NetWmWindowTypeMenu:
    case Qt::WA_X11NetWmWindowTypeUtility:
    case Qt::WA_X11NetWmWindowTypeSplash:
    case Qt::WA_X11NetWmWindowTypeDialog:
    case Qt::WA_X11NetWmWindowTypeDropDownMenu:
    case Qt::WA_X11NetWmWindowTypePopupMenu:
    case Qt::WA_X11NetWmWindowTypeToolTip:
    case Qt::WA_X11NetWmWindowTypeNotification:
    case Qt::WA_X11NetWmWindowTypeCombo:
    case Qt::WA_X11NetWmWindowTypeDND:
        if (testAttribute(Qt::WA_WState_Created))
            d->setNetWmWindowTypes();
        break;
#endif

    case Qt::WA_StaticContents:
        if (QWidgetBackingStore *bs = d->maybeBackingStore()) {
            if (on)
                bs->addStaticWidget(this);
            else
                bs->removeStaticWidget(this);
        }
        break;
    case Qt::WA_TranslucentBackground:
#if defined(Q_OS_SYMBIAN)
        setAttribute(Qt::WA_NoSystemBackground, on);
#else
        if (on) {
            setAttribute(Qt::WA_NoSystemBackground);
            d->updateIsTranslucent();
        }
#endif
        break;
    case Qt::WA_AcceptTouchEvents:
#if defined(Q_WS_WIN) || defined(Q_WS_MAC) || defined(Q_OS_SYMBIAN)
        if (on)
            d->registerTouchWindow();
#endif
        break;
    case Qt::WA_LockPortraitOrientation:
    case Qt::WA_LockLandscapeOrientation:
    case Qt::WA_AutoOrientation: {
        const Qt::WidgetAttribute orientations[3] = {
            Qt::WA_LockPortraitOrientation,
            Qt::WA_LockLandscapeOrientation,
            Qt::WA_AutoOrientation
        };

        if (on) {
            // We can only have one of these set at a time
            for (int i = 0; i < 3; ++i) {
                if (orientations[i] != attribute)
                    setAttribute_internal(orientations[i], false, data, d);
            }
        }

#ifdef Q_OS_BLACKBERRY
        if (testAttribute(Qt::WA_AutoOrientation)) {
            navigator_rotation_lock(false);
        } else {
#ifdef Q_OS_BLACKBERRY_TABLET
            const bool portraitLocked = testAttribute(Qt::WA_LockPortraitOrientation);

            orientation_direction_t direction;
            orientation_get(&direction, 0);

            int rotation = 0;

            switch (direction) {
            case ORIENTATION_TOP_UP:
            case ORIENTATION_RIGHT_UP:
                rotation = portraitLocked ? 90 : 0;
                break;
            case ORIENTATION_BOTTOM_UP:
            case ORIENTATION_LEFT_UP:
                rotation = portraitLocked ? 270 : 180;
                break;
            default:
                break;
            }

            navigator_set_orientation(rotation, 0);
#else
            navigator_set_orientation_mode((testAttribute(Qt::WA_LockPortraitOrientation) ?
                                            NAVIGATOR_PORTRAIT : NAVIGATOR_LANDSCAPE), 0);
#endif // Q_OS_BLACKBERRY_TABLET
            navigator_rotation_lock(true);
        }
#endif // Q_OS_BLACKBERRY

#ifdef Q_WS_S60
        CAknAppUiBase* appUi = static_cast<CAknAppUiBase*>(CEikonEnv::Static()->EikAppUi());
        const CAknAppUiBase::TAppUiOrientation s60orientations[] = {
            CAknAppUiBase::EAppUiOrientationPortrait,
            CAknAppUiBase::EAppUiOrientationLandscape,
            CAknAppUiBase::EAppUiOrientationAutomatic
        };
        CAknAppUiBase::TAppUiOrientation s60orientation = CAknAppUiBase::EAppUiOrientationUnspecified;
        for (int i = 0; i < 3; ++i) {
            if (testAttribute(orientations[i])) {
                s60orientation = s60orientations[i];
                break;
            }
        }
        QT_TRAP_THROWING(appUi->SetOrientationL(s60orientation));
        S60->orientationSet = true;
        QSymbianControl *window = static_cast<QSymbianControl *>(internalWinId());
        if (window)
            window->ensureFixNativeOrientation();
#endif
        break;
    }
    default:
        break;
    }
}

bool QWidget::testAttribute_helper(Qt::WidgetAttribute attribute) const
{
    Q_D(const QWidget);
    const int x = attribute - 8*sizeof(uint);
    const int int_off = x / (8*sizeof(uint));
    return (d->high_attributes[int_off] & (1<<(x-(int_off*8*sizeof(uint)))));
}

qreal QWidget::windowOpacity() const
{
    Q_D(const QWidget);
    return (isWindow() && d->maybeTopData()) ? d->maybeTopData()->opacity / qreal(255.) : qreal(1.0);
}

void QWidget::setWindowOpacity(qreal opacity)
{
    Q_D(QWidget);
    if (!isWindow())
        return;

    opacity = qBound(qreal(0.0), opacity, qreal(1.0));
    QTLWExtra *extra = d->topData();
    extra->opacity = uint(opacity * 255);
    setAttribute(Qt::WA_WState_WindowOpacitySet);

#ifndef Q_WS_QWS
    if (!testAttribute(Qt::WA_WState_Created))
        return;
#endif

#ifndef QT_NO_GRAPHICSVIEW
    if (QGraphicsProxyWidget *proxy = graphicsProxyWidget()) {
        // Avoid invalidating the cache if set.
        if (proxy->cacheMode() == QGraphicsItem::NoCache)
            proxy->update();
        else if (QGraphicsScene *scene = proxy->scene())
            scene->update(proxy->sceneBoundingRect());
        return;
    }
#endif

    d->setWindowOpacity_sys(opacity);
}

bool QWidget::isWindowModified() const
{
    return testAttribute(Qt::WA_WindowModified);
}

void QWidget::setWindowModified(bool mod)
{
    Q_D(QWidget);
    setAttribute(Qt::WA_WindowModified, mod);

#ifndef Q_WS_MAC
    if (!windowTitle().contains(QLatin1String("[*]")) && mod)
        qWarning("QWidget::setWindowModified: The window title does not contain a '[*]' placeholder");
#endif
    d->setWindowTitle_helper(windowTitle());
    d->setWindowIconText_helper(windowIconText());
#ifdef Q_WS_MAC
    d->setWindowModified_sys(mod);
#endif

    QEvent e(QEvent::ModifiedChange);
    QApplication::sendEvent(this, &e);
}

#ifndef QT_NO_TOOLTIP

void QWidget::setToolTip(const QString &s)
{
    Q_D(QWidget);
    d->toolTip = s;

    QEvent event(QEvent::ToolTipChange);
    QApplication::sendEvent(this, &event);
}

QString QWidget::toolTip() const
{
    Q_D(const QWidget);
    return d->toolTip;
}
#endif // QT_NO_TOOLTIP


#ifndef QT_NO_STATUSTIP

void QWidget::setStatusTip(const QString &s)
{
    Q_D(QWidget);
    d->statusTip = s;
}

QString QWidget::statusTip() const
{
    Q_D(const QWidget);
    return d->statusTip;
}
#endif // QT_NO_STATUSTIP

#ifndef QT_NO_WHATSTHIS

void QWidget::setWhatsThis(const QString &s)
{
    Q_D(QWidget);
    d->whatsThis = s;
}

QString QWidget::whatsThis() const
{
    Q_D(const QWidget);
    return d->whatsThis;
}
#endif // QT_NO_WHATSTHIS

#ifndef QT_NO_ACCESSIBILITY

void QWidget::setAccessibleName(const QString &name)
{
    Q_D(QWidget);
    d->accessibleName = name;
    QAccessible::updateAccessibility(this, 0, QAccessible::NameChanged);
}

QString QWidget::accessibleName() const
{
    Q_D(const QWidget);
    return d->accessibleName;
}

void QWidget::setAccessibleDescription(const QString &description)
{
    Q_D(QWidget);
    d->accessibleDescription = description;
    QAccessible::updateAccessibility(this, 0, QAccessible::DescriptionChanged);
}

QString QWidget::accessibleDescription() const
{
    Q_D(const QWidget);
    return d->accessibleDescription;
}
#endif // QT_NO_ACCESSIBILITY

#ifndef QT_NO_SHORTCUT

int QWidget::grabShortcut(const QKeySequence &key, Qt::ShortcutContext context)
{
    Q_ASSERT(qApp);
    if (key.isEmpty())
        return 0;
    setAttribute(Qt::WA_GrabbedShortcut);
    return qApp->d_func()->shortcutMap.addShortcut(this, key, context);
}

void QWidget::releaseShortcut(int id)
{
    Q_ASSERT(qApp);
    if (id)
        qApp->d_func()->shortcutMap.removeShortcut(id, this, 0);
}

void QWidget::setShortcutEnabled(int id, bool enable)
{
    Q_ASSERT(qApp);
    if (id)
        qApp->d_func()->shortcutMap.setShortcutEnabled(enable, id, this, 0);
}

void QWidget::setShortcutAutoRepeat(int id, bool enable)
{
    Q_ASSERT(qApp);
    if (id)
        qApp->d_func()->shortcutMap.setShortcutAutoRepeat(enable, id, this, 0);
}
#endif // QT_NO_SHORTCUT

void QWidget::updateMicroFocus()
{
#if !defined(QT_NO_IM) && (defined(Q_WS_X11) || defined(Q_WS_QWS) || defined(Q_OS_SYMBIAN))
    Q_D(QWidget);
    // and optimization to update input context only it has already been created.
    if (d->assignedInputContext() || qApp->d_func()->inputContext) {
        QInputContext *ic = inputContext();
        if (ic)
            ic->update();
    }
#endif
#ifndef QT_NO_ACCESSIBILITY
    if (isVisible()) {
        // ##### is this correct
        QAccessible::updateAccessibility(this, 0, QAccessible::StateChanged);
    }
#endif
}


#if defined (Q_WS_WIN)

HDC QWidget::getDC() const
{
    Q_D(const QWidget);
    if (d->hd)
        return (HDC) d->hd;
    return GetDC(winId());
}

void QWidget::releaseDC(HDC hdc) const
{
    Q_D(const QWidget);
    // If its the widgets own dc, it will be released elsewhere. If
    // its a different HDC we release it and issue a warning if it
    // fails.
    if (hdc != d->hd && !ReleaseDC(winId(), hdc))
        qErrnoWarning("QWidget::releaseDC(): failed to release HDC");
}
#else

Qt::HANDLE QWidget::handle() const
{
    Q_D(const QWidget);
    if (!internalWinId() && testAttribute(Qt::WA_WState_Created))
        (void)winId(); // enforce native window
    return d->hd;
}
#endif


void QWidget::raise()
{
    Q_D(QWidget);
    if (!isWindow()) {
        QWidget *p = parentWidget();
        const int parentChildCount = p->d_func()->children.size();
        if (parentChildCount < 2)
            return;
        const int from = p->d_func()->children.indexOf(this);
        Q_ASSERT(from >= 0);
        // Do nothing if the widget is already in correct stacking order _and_ created.
        if (from != parentChildCount -1)
            p->d_func()->children.move(from, parentChildCount - 1);
        if (!testAttribute(Qt::WA_WState_Created) && p->testAttribute(Qt::WA_WState_Created))
            create();
        else if (from == parentChildCount - 1)
            return;

        QRegion region(rect());
        d->subtractOpaqueSiblings(region);
        d->invalidateBuffer(region);
    }
    if (testAttribute(Qt::WA_WState_Created))
        d->raise_sys();

    QEvent e(QEvent::ZOrderChange);
    QApplication::sendEvent(this, &e);
}

void QWidget::lower()
{
    Q_D(QWidget);
    if (!isWindow()) {
        QWidget *p = parentWidget();
        const int parentChildCount = p->d_func()->children.size();
        if (parentChildCount < 2)
            return;
        const int from = p->d_func()->children.indexOf(this);
        Q_ASSERT(from >= 0);
        // Do nothing if the widget is already in correct stacking order _and_ created.
        if (from != 0)
            p->d_func()->children.move(from, 0);
        if (!testAttribute(Qt::WA_WState_Created) && p->testAttribute(Qt::WA_WState_Created))
            create();
        else if (from == 0)
            return;
    }
    if (testAttribute(Qt::WA_WState_Created))
        d->lower_sys();

    QEvent e(QEvent::ZOrderChange);
    QApplication::sendEvent(this, &e);
}


void QWidget::stackUnder(QWidget* w)
{
    Q_D(QWidget);
    QWidget *p = parentWidget();
    if (!w || isWindow() || p != w->parentWidget() || this == w)
        return;
    if (p) {
        int from = p->d_func()->children.indexOf(this);
        int to = p->d_func()->children.indexOf(w);
        Q_ASSERT(from >= 0);
        Q_ASSERT(to >= 0);
        if (from < to)
            --to;
        // Do nothing if the widget is already in correct stacking order _and_ created.
        if (from != to)
            p->d_func()->children.move(from, to);
        if (!testAttribute(Qt::WA_WState_Created) && p->testAttribute(Qt::WA_WState_Created))
            create();
        else if (from == to)
            return;
    }
    if (testAttribute(Qt::WA_WState_Created))
        d->stackUnder_sys(w);

    QEvent e(QEvent::ZOrderChange);
    QApplication::sendEvent(this, &e);
}

void QWidget::styleChange(QStyle&) { }
void QWidget::enabledChange(bool) { }  // compat
void QWidget::paletteChange(const QPalette &) { }  // compat
void QWidget::fontChange(const QFont &) { }  // compat
void QWidget::windowActivationChange(bool) { }  // compat
void QWidget::languageChange() { }  // compat


QRect QWidgetPrivate::frameStrut() const
{
    Q_Q(const QWidget);
    if (!q->isWindow() || (q->windowType() == Qt::Desktop) || q->testAttribute(Qt::WA_DontShowOnScreen)) {
        // x2 = x1 + w - 1, so w/h = 1
        return QRect(0, 0, 1, 1);
    }

    if (data.fstrut_dirty
#ifndef Q_WS_WIN
        // ### Fix properly for 4.3
        && q->isVisible()
#endif
        && q->testAttribute(Qt::WA_WState_Created))
        const_cast<QWidgetPrivate *>(this)->updateFrameStrut();

    return maybeTopData() ? maybeTopData()->frameStrut : QRect();
}

#ifdef QT_KEYPAD_NAVIGATION

bool QWidgetPrivate::navigateToDirection(Direction direction)
{
    QWidget *targetWidget = widgetInNavigationDirection(direction);
    if (targetWidget)
        targetWidget->setFocus();
    return (targetWidget != 0);
}

QWidget *QWidgetPrivate::widgetInNavigationDirection(Direction direction)
{
    const QWidget *sourceWidget = QApplication::focusWidget();
    if (!sourceWidget)
        return 0;
    const QRect sourceRect = sourceWidget->rect().translated(sourceWidget->mapToGlobal(QPoint()));
    const int sourceX =
            (direction == DirectionNorth || direction == DirectionSouth) ?
                (sourceRect.left() + (sourceRect.right() - sourceRect.left()) / 2)
                :(direction == DirectionEast ? sourceRect.right() : sourceRect.left());
    const int sourceY =
            (direction == DirectionEast || direction == DirectionWest) ?
                (sourceRect.top() + (sourceRect.bottom() - sourceRect.top()) / 2)
                :(direction == DirectionSouth ? sourceRect.bottom() : sourceRect.top());
    const QPoint sourcePoint(sourceX, sourceY);
    const QPoint sourceCenter = sourceRect.center();
    const QWidget *sourceWindow = sourceWidget->window();

    QWidget *targetWidget = 0;
    int shortestDistance = INT_MAX;
    foreach(QWidget *targetCandidate, QApplication::allWidgets()) {

        const QRect targetCandidateRect = targetCandidate->rect().translated(targetCandidate->mapToGlobal(QPoint()));

        // For focus proxies, the child widget handling the focus can have keypad navigation focus,
        // but the owner of the proxy cannot.
        // Additionally, empty widgets should be ignored.
        if (targetCandidate->focusProxy() || targetCandidateRect.isEmpty())
            continue;

        // Only navigate to a target widget that...
        if (       targetCandidate != sourceWidget
                   // ...takes the focus,
                && targetCandidate->focusPolicy() & Qt::TabFocus
                   // ...is above if DirectionNorth,
                && !(direction == DirectionNorth && targetCandidateRect.bottom() > sourceRect.top())
                   // ...is on the right if DirectionEast,
                && !(direction == DirectionEast  && targetCandidateRect.left()   < sourceRect.right())
                   // ...is below if DirectionSouth,
                && !(direction == DirectionSouth && targetCandidateRect.top()    < sourceRect.bottom())
                   // ...is on the left if DirectionWest,
                && !(direction == DirectionWest  && targetCandidateRect.right()  > sourceRect.left())
                   // ...is enabled,
                && targetCandidate->isEnabled()
                   // ...is visible,
                && targetCandidate->isVisible()
                   // ...is in the same window,
                && targetCandidate->window() == sourceWindow) {
            const int targetCandidateDistance = pointToRect(sourcePoint, targetCandidateRect);
            if (targetCandidateDistance < shortestDistance) {
                shortestDistance = targetCandidateDistance;
                targetWidget = targetCandidate;
            }
        }
    }
    return targetWidget;
}

bool QWidgetPrivate::canKeypadNavigate(Qt::Orientation orientation)
{
    return orientation == Qt::Horizontal?
            (QWidgetPrivate::widgetInNavigationDirection(QWidgetPrivate::DirectionEast)
                    || QWidgetPrivate::widgetInNavigationDirection(QWidgetPrivate::DirectionWest))
            :(QWidgetPrivate::widgetInNavigationDirection(QWidgetPrivate::DirectionNorth)
                    || QWidgetPrivate::widgetInNavigationDirection(QWidgetPrivate::DirectionSouth));
}
bool QWidgetPrivate::inTabWidget(QWidget *widget)
{
    for (QWidget *tabWidget = widget; tabWidget; tabWidget = tabWidget->parentWidget())
        if (qobject_cast<const QTabWidget*>(tabWidget))
            return true;
    return false;
}
#endif

void QWidget::setWindowSurface(QWindowSurface *surface)
{
    // ### createWinId() ??

#ifndef Q_BACKINGSTORE_SUBSURFACES
    if (!isTopLevel())
        return;
#endif

    Q_D(QWidget);

    QTLWExtra *topData = d->topData();
    if (topData->windowSurface == surface)
        return;

    QWindowSurface *oldSurface = topData->windowSurface;
    delete topData->windowSurface;
    topData->windowSurface = surface;

    QWidgetBackingStore *bs = d->maybeBackingStore();
    if (!bs)
        return;

    if (isTopLevel()) {
        if (bs->windowSurface != oldSurface && bs->windowSurface != surface)
            delete bs->windowSurface;
        bs->windowSurface = surface;
    }
#ifdef Q_BACKINGSTORE_SUBSURFACES
    else {
        bs->subSurfaces.append(surface);
    }
    bs->subSurfaces.removeOne(oldSurface);
#endif
}

QWindowSurface *QWidget::windowSurface() const
{
    Q_D(const QWidget);
    QTLWExtra *extra = d->maybeTopData();
    if (extra && extra->windowSurface)
        return extra->windowSurface;

    QWidgetBackingStore *bs = d->maybeBackingStore();

#ifdef Q_BACKINGSTORE_SUBSURFACES
    if (bs && bs->subSurfaces.isEmpty())
        return bs->windowSurface;

    if (!isTopLevel()) {
        const QWidget *w = parentWidget();
        while (w) {
            QTLWExtra *extra = w->d_func()->maybeTopData();
            if (extra && extra->windowSurface)
                return extra->windowSurface;
            if (w->isTopLevel())
                break;
            w = w->parentWidget();
        }
    }
#endif // Q_BACKINGSTORE_SUBSURFACES

    return bs ? bs->windowSurface : 0;
}

void QWidgetPrivate::getLayoutItemMargins(int *left, int *top, int *right, int *bottom) const
{
    if (left)
        *left = (int)leftLayoutItemMargin;
    if (top)
        *top = (int)topLayoutItemMargin;
    if (right)
        *right = (int)rightLayoutItemMargin;
    if (bottom)
        *bottom = (int)bottomLayoutItemMargin;
}

void QWidgetPrivate::setLayoutItemMargins(int left, int top, int right, int bottom)
{
    if (leftLayoutItemMargin == left
        && topLayoutItemMargin == top
        && rightLayoutItemMargin == right
        && bottomLayoutItemMargin == bottom)
        return;

    Q_Q(QWidget);
    leftLayoutItemMargin = (signed char)left;
    topLayoutItemMargin = (signed char)top;
    rightLayoutItemMargin = (signed char)right;
    bottomLayoutItemMargin = (signed char)bottom;
    q->updateGeometry();
}

void QWidgetPrivate::setLayoutItemMargins(QStyle::SubElement element, const QStyleOption *opt)
{
    Q_Q(QWidget);
    QStyleOption myOpt;
    if (!opt) {
        myOpt.initFrom(q);
        myOpt.rect.setRect(0, 0, 32768, 32768);     // arbitrary
        opt = &myOpt;
    }

    QRect liRect = q->style()->subElementRect(element, opt, q);
    if (liRect.isValid()) {
        leftLayoutItemMargin = (signed char)(opt->rect.left() - liRect.left());
        topLayoutItemMargin = (signed char)(opt->rect.top() - liRect.top());
        rightLayoutItemMargin = (signed char)(liRect.right() - opt->rect.right());
        bottomLayoutItemMargin = (signed char)(liRect.bottom() - opt->rect.bottom());
    } else {
        leftLayoutItemMargin = 0;
        topLayoutItemMargin = 0;
        rightLayoutItemMargin = 0;
        bottomLayoutItemMargin = 0;
    }
}
// resets the Qt::WA_QuitOnClose attribute to the default value for transient widgets.
void QWidgetPrivate::adjustQuitOnCloseAttribute()
{
    Q_Q(QWidget);

    if (!q->parentWidget()) {
        Qt::WindowType type = q->windowType();
        if (type == Qt::Widget || type == Qt::SubWindow)
            type = Qt::Window;
        if (type != Qt::Widget && type != Qt::Window && type != Qt::Dialog)
            q->setAttribute(Qt::WA_QuitOnClose, false);
    }
}



Q_GUI_EXPORT QWidgetData *qt_qwidget_data(QWidget *widget)
{
    return widget->data;
}

Q_GUI_EXPORT QWidgetPrivate *qt_widget_private(QWidget *widget)
{
    return widget->d_func();
}


#ifndef QT_NO_GRAPHICSVIEW

QGraphicsProxyWidget *QWidget::graphicsProxyWidget() const
{
    Q_D(const QWidget);
    if (d->extra) {
        return d->extra->proxyWidget;
    }
    return 0;
}
#endif


#ifndef QT_NO_GESTURES

void QWidget::grabGesture(Qt::GestureType gesture, Qt::GestureFlags flags)
{
    Q_D(QWidget);
    d->gestureContext.insert(gesture, flags);
    (void)QGestureManager::instance(); // create a gesture manager
}

void QWidget::ungrabGesture(Qt::GestureType gesture)
{
    Q_D(QWidget);
    if (d->gestureContext.remove(gesture)) {
        if (QGestureManager *manager = QGestureManager::instance())
            manager->cleanupCachedGestures(this, gesture);
    }
}
#endif // QT_NO_GESTURES

void QWidget::setMask(const QRegion &newMask)
{
    Q_D(QWidget);

    d->createExtra();
    if (newMask == d->extra->mask)
        return;

#ifndef QT_NO_BACKINGSTORE
    const QRegion oldMask(d->extra->mask);
#endif

    d->extra->mask = newMask;
    d->extra->hasMask = !newMask.isEmpty();

#ifndef QT_MAC_USE_COCOA
    if (!testAttribute(Qt::WA_WState_Created))
        return;
#endif

    d->setMask_sys(newMask);

#ifndef QT_NO_BACKINGSTORE
    if (!isVisible())
        return;

    if (!d->extra->hasMask) {
        // Mask was cleared; update newly exposed area.
        QRegion expose(rect());
        expose -= oldMask;
        if (!expose.isEmpty()) {
            d->setDirtyOpaqueRegion();
            update(expose);
        }
        return;
    }

    if (!isWindow()) {
        // Update newly exposed area on the parent widget.
        QRegion parentExpose(rect());
        parentExpose -= newMask;
        if (!parentExpose.isEmpty()) {
            d->setDirtyOpaqueRegion();
            parentExpose.translate(data->crect.topLeft());
            parentWidget()->update(parentExpose);
        }

        // Update newly exposed area on this widget
        if (!oldMask.isEmpty())
            update(newMask - oldMask);
    }
#endif
}

void QWidget::setMask(const QBitmap &bitmap)
{
    setMask(QRegion(bitmap));
}

void QWidget::clearMask()
{
    setMask(QRegion());
}

#ifdef Q_OS_SYMBIAN
void QWidgetPrivate::_q_cleanupWinIds()
{
    foreach (WId wid, widCleanupList)
        delete wid;
    widCleanupList.clear();
}
#endif

#if QT_MAC_USE_COCOA
void QWidgetPrivate::syncUnifiedMode() {
    // The whole purpose of this method is to keep the unifiedToolbar in sync.
    // That means making sure we either exchange the drawing methods or we let
    // the toolbar know that it does not require to draw the baseline.
    Q_Q(QWidget);
    // This function makes sense only if this is a top level
    if(!q->isWindow())
        return;
    OSWindowRef window = qt_mac_window_for(q);
    if(changeMethods) {
        // Ok, we are in documentMode.
        if(originalDrawMethod)
            qt_mac_replaceDrawRect(window, this);
    } else {
        if(!originalDrawMethod)
            qt_mac_replaceDrawRectOriginal(window, this);
    }
}

#endif // QT_MAC_USE_COCOA

QT_END_NAMESPACE

#include "moc_qwidget.cpp"