qgraphicsproxywidget.cpp

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#include "qglobal.h"

#ifndef QT_NO_GRAPHICSVIEW

#include "qgraphicslayout.h"
#include "qgraphicsproxywidget.h"
#include "private/qgraphicsproxywidget_p.h"
#include "private/qwidget_p.h"
#include "private/qapplication_p.h"

#include <QtCore/qdebug.h>
#include <QtGui/qevent.h>
#include <QtGui/qgraphicsscene.h>
#include <QtGui/qgraphicssceneevent.h>
#include <QtGui/qlayout.h>
#include <QtGui/qpainter.h>
#include <QtGui/qstyleoption.h>
#include <QtGui/qgraphicsview.h>
#include <QtGui/qlistview.h>
#include <QtGui/qlineedit.h>
#include <QtGui/qtextedit.h>

QT_BEGIN_NAMESPACE

//#define GRAPHICSPROXYWIDGET_DEBUG

extern bool qt_sendSpontaneousEvent(QObject *, QEvent *);
Q_GUI_EXPORT extern bool qt_tab_all_widgets;

void QGraphicsProxyWidgetPrivate::init()
{
    Q_Q(QGraphicsProxyWidget);
    q->setFocusPolicy(Qt::WheelFocus);
    q->setAcceptDrops(true);
}

void QGraphicsProxyWidgetPrivate::sendWidgetMouseEvent(QGraphicsSceneHoverEvent *event)
{
    QGraphicsSceneMouseEvent mouseEvent(QEvent::GraphicsSceneMouseMove);
    mouseEvent.setPos(event->pos());
    mouseEvent.setScreenPos(event->screenPos());
    mouseEvent.setButton(Qt::NoButton);
    mouseEvent.setButtons(0);
    mouseEvent.setModifiers(event->modifiers());
    sendWidgetMouseEvent(&mouseEvent);
    event->setAccepted(mouseEvent.isAccepted());
}

void QGraphicsProxyWidgetPrivate::sendWidgetMouseEvent(QGraphicsSceneMouseEvent *event)
{
    if (!event || !widget || !widget->isVisible())
        return;
    Q_Q(QGraphicsProxyWidget);

    // Find widget position and receiver.
    QPointF pos = event->pos();
    QPointer<QWidget> alienWidget = widget->childAt(pos.toPoint());
    QPointer<QWidget> receiver =  alienWidget ? alienWidget : widget;

    if (QWidgetPrivate::nearestGraphicsProxyWidget(receiver) != q)
        return; //another proxywidget will handle the events

    // Translate QGraphicsSceneMouse events to QMouseEvents.
    QEvent::Type type = QEvent::None;
    switch (event->type()) {
    case QEvent::GraphicsSceneMousePress:
        type = QEvent::MouseButtonPress;
        if (!embeddedMouseGrabber)
            embeddedMouseGrabber = receiver;
        else
            receiver = embeddedMouseGrabber;
        break;
    case QEvent::GraphicsSceneMouseRelease:
        type = QEvent::MouseButtonRelease;
        if (embeddedMouseGrabber)
            receiver = embeddedMouseGrabber;
        break;
    case QEvent::GraphicsSceneMouseDoubleClick:
        type = QEvent::MouseButtonDblClick;
        if (!embeddedMouseGrabber)
            embeddedMouseGrabber = receiver;
        else
            receiver = embeddedMouseGrabber;
        break;
    case QEvent::GraphicsSceneMouseMove:
        type = QEvent::MouseMove;
        if (embeddedMouseGrabber)
            receiver = embeddedMouseGrabber;
        break;
    default:
        Q_ASSERT_X(false, "QGraphicsProxyWidget", "internal error");
        break;
    }

    if (!lastWidgetUnderMouse) {
        QApplicationPrivate::dispatchEnterLeave(embeddedMouseGrabber ? embeddedMouseGrabber : receiver, 0);
        lastWidgetUnderMouse = receiver;
    }

    // Map event position from us to the receiver
    pos = mapToReceiver(pos, receiver);

    // Send mouse event.
    QMouseEvent *mouseEvent = QMouseEvent::createExtendedMouseEvent(type, pos,
                                                                    receiver->mapToGlobal(pos.toPoint()), event->button(),
                                                                    event->buttons(), event->modifiers());

    QWidget *embeddedMouseGrabberPtr = (QWidget *)embeddedMouseGrabber;
    QApplicationPrivate::sendMouseEvent(receiver, mouseEvent, alienWidget, widget,
                                        &embeddedMouseGrabberPtr, lastWidgetUnderMouse, event->spontaneous());
    embeddedMouseGrabber = embeddedMouseGrabberPtr;

    // Handle enter/leave events when last button is released from mouse
    // grabber child widget.
    if (embeddedMouseGrabber && type == QEvent::MouseButtonRelease && !event->buttons()) {
        Q_Q(QGraphicsProxyWidget);
        if (q->rect().contains(event->pos()) && q->acceptsHoverEvents())
            lastWidgetUnderMouse = alienWidget ? alienWidget : widget;
        else // released on the frame our outside the item, or doesn't accept hover events.
            lastWidgetUnderMouse = 0;

        QApplicationPrivate::dispatchEnterLeave(lastWidgetUnderMouse, embeddedMouseGrabber);
        embeddedMouseGrabber = 0;

#ifndef QT_NO_CURSOR
        // ### Restore the cursor, don't override it.
        if (!lastWidgetUnderMouse)
            q->unsetCursor();
#endif
    }

    event->setAccepted(mouseEvent->isAccepted());
    delete mouseEvent;
}

void QGraphicsProxyWidgetPrivate::sendWidgetKeyEvent(QKeyEvent *event)
{
    Q_Q(QGraphicsProxyWidget);
    if (!event || !widget || !widget->isVisible())
        return;

    QPointer<QWidget> receiver = widget->focusWidget();
    if (!receiver)
        receiver = widget;
    Q_ASSERT(receiver);

    do {
        bool res = QApplication::sendEvent(receiver, event);
        if ((res && event->isAccepted()) || (q->isWindow() && receiver == widget))
            break;
        receiver = receiver->parentWidget();
    } while (receiver);
}

void QGraphicsProxyWidgetPrivate::removeSubFocusHelper(QWidget *widget, Qt::FocusReason reason)
{
    QFocusEvent event(QEvent::FocusOut, reason);
    QPointer<QWidget> widgetGuard = widget;
    QApplication::sendEvent(widget, &event);
    if (widgetGuard && event.isAccepted())
        QApplication::sendEvent(widget->style(), &event);
}

QVariant QGraphicsProxyWidgetPrivate::inputMethodQueryHelper(Qt::InputMethodQuery query) const
{
    Q_Q(const QGraphicsProxyWidget);
    if (!widget || !q->hasFocus())
        return QVariant();

    QWidget *focusWidget = widget->focusWidget();
    if (!focusWidget)
        focusWidget = widget;
    QVariant v = focusWidget->inputMethodQuery(query);
    QPointF focusWidgetPos = q->subWidgetRect(focusWidget).topLeft();
    switch (v.type()) {
    case QVariant::RectF:
        v = v.toRectF().translated(focusWidgetPos);
        break;
    case QVariant::PointF:
        v = v.toPointF() + focusWidgetPos;
        break;
    case QVariant::Rect:
        v = v.toRect().translated(focusWidgetPos.toPoint());
        break;
    case QVariant::Point:
        v = v.toPoint() + focusWidgetPos.toPoint();
        break;
    default:
        break;
    }
    return v;
}

QWidget *QGraphicsProxyWidgetPrivate::findFocusChild(QWidget *child, bool next) const
{
    if (!widget)
        return 0;

    // Run around the focus chain until we find a widget that can take tab focus.
    if (!child) {
    child = next ? (QWidget *)widget : widget->d_func()->focus_prev;
    } else {
        child = next ? child->d_func()->focus_next : child->d_func()->focus_prev;
        if ((next && child == widget) || (!next && child == widget->d_func()->focus_prev)) {
             return 0;
        }
    }

    QWidget *oldChild = child;
    uint focus_flag = qt_tab_all_widgets ? Qt::TabFocus : Qt::StrongFocus;
    do {
        if (child->isEnabled()
        && child->isVisibleTo(widget)
            && ((child->focusPolicy() & focus_flag) == focus_flag)
            && !(child->d_func()->extra && child->d_func()->extra->focus_proxy)) {
            return child;
        }
        child = next ? child->d_func()->focus_next : child->d_func()->focus_prev;
    } while (child != oldChild && !(next && child == widget) && !(!next && child == widget->d_func()->focus_prev));
    return 0;
}

void QGraphicsProxyWidgetPrivate::_q_removeWidgetSlot()
{
    Q_Q(QGraphicsProxyWidget);
    widget = 0;
    delete q;
}

void QGraphicsProxyWidgetPrivate::updateWidgetGeometryFromProxy()
{
}

void QGraphicsProxyWidgetPrivate::updateProxyGeometryFromWidget()
{
    Q_Q(QGraphicsProxyWidget);
    if (!widget)
        return;

    QRectF widgetGeometry = widget->geometry();
    QWidget *parentWidget = widget->parentWidget();
    if (widget->isWindow()) {
        QGraphicsProxyWidget *proxyParent = 0;
        if (parentWidget && (proxyParent = qobject_cast<QGraphicsProxyWidget *>(q->parentWidget()))) {
            // Nested window proxy (e.g., combobox popup), map widget to the
            // parent widget's global coordinates, and map that to the parent
            // proxy's child coordinates.
            widgetGeometry.moveTo(proxyParent->subWidgetRect(parentWidget).topLeft()
                                  + parentWidget->mapFromGlobal(widget->pos()));
        }
    }

    // Adjust to size hint if the widget has never been resized.
    if (!widget->size().isValid())
        widgetGeometry.setSize(widget->sizeHint());

    // Assign new geometry.
    posChangeMode = QGraphicsProxyWidgetPrivate::WidgetToProxyMode;
    sizeChangeMode = QGraphicsProxyWidgetPrivate::WidgetToProxyMode;
    q->setGeometry(widgetGeometry);
    posChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
    sizeChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
}

void QGraphicsProxyWidgetPrivate::updateProxyInputMethodAcceptanceFromWidget()
{
    Q_Q(QGraphicsProxyWidget);
    if (!widget)
        return;

    QWidget *focusWidget = widget->focusWidget();
    if (!focusWidget)
        focusWidget = widget;
    q->setFlag(QGraphicsItem::ItemAcceptsInputMethod,
               focusWidget->testAttribute(Qt::WA_InputMethodEnabled));
}

void QGraphicsProxyWidgetPrivate::embedSubWindow(QWidget *subWin)
{
    QWExtra *extra;
    if (!((extra = subWin->d_func()->extra) && extra->proxyWidget)) {
        QGraphicsProxyWidget *subProxy = new QGraphicsProxyWidget(q_func(), subWin->windowFlags());
        subProxy->d_func()->setWidget_helper(subWin, false);
    }
}

void QGraphicsProxyWidgetPrivate::unembedSubWindow(QWidget *subWin)
{
    foreach (QGraphicsItem *child, children) {
        if (child->isWidget()) {
            if (QGraphicsProxyWidget *proxy = qobject_cast<QGraphicsProxyWidget *>(static_cast<QGraphicsWidget *>(child))) {
                if (proxy->widget() == subWin) {
                    proxy->setWidget(0);
                    scene->removeItem(proxy);
                    delete proxy;
                    return;
                }
            }
        }
    }
}

bool QGraphicsProxyWidgetPrivate::isProxyWidget() const
{
    return true;
}

QPointF QGraphicsProxyWidgetPrivate::mapToReceiver(const QPointF &pos, const QWidget *receiver) const
{
    QPointF p = pos;
    // Map event position from us to the receiver, preserving its
    // precision (don't use QWidget::mapFrom here).
    while (receiver && receiver != widget) {
        p -= QPointF(receiver->pos());
        receiver = receiver->parentWidget();
    }
    return p;
}

QGraphicsProxyWidget::QGraphicsProxyWidget(QGraphicsItem *parent, Qt::WindowFlags wFlags)
    : QGraphicsWidget(*new QGraphicsProxyWidgetPrivate, parent, 0, wFlags)
{
    Q_D(QGraphicsProxyWidget);
    d->init();
}

QGraphicsProxyWidget::~QGraphicsProxyWidget()
{
    Q_D(QGraphicsProxyWidget);
    if (d->widget) {
        QObject::disconnect(d->widget, SIGNAL(destroyed()), this, SLOT(_q_removeWidgetSlot()));
        delete d->widget;
    }
}

void QGraphicsProxyWidget::setWidget(QWidget *widget)
{
    Q_D(QGraphicsProxyWidget);
    d->setWidget_helper(widget, true);
}

void QGraphicsProxyWidgetPrivate::setWidget_helper(QWidget *newWidget, bool autoShow)
{
    Q_Q(QGraphicsProxyWidget);
    if (newWidget == widget)
        return;
    if (widget) {
        QObject::disconnect(widget, SIGNAL(destroyed()), q, SLOT(_q_removeWidgetSlot()));
        widget->removeEventFilter(q);
        widget->setAttribute(Qt::WA_DontShowOnScreen, false);
        widget->d_func()->extra->proxyWidget = 0;
        resolveFont(inheritedFontResolveMask);
        resolvePalette(inheritedPaletteResolveMask);
        widget->update();

        foreach (QGraphicsItem *child, q->childItems()) {
            if (child->d_ptr->isProxyWidget()) {
                QGraphicsProxyWidget *childProxy = static_cast<QGraphicsProxyWidget *>(child);
                QWidget * parent = childProxy->widget();
                while (parent->parentWidget() != 0) {
                    if (parent == widget)
                        break;
                    parent = parent->parentWidget();
                }
                if (!childProxy->widget() || parent != widget)
                    continue;
                childProxy->setWidget(0);
                delete childProxy;
            }
        }

        widget = 0;
#ifndef QT_NO_CURSOR
        q->unsetCursor();
#endif
        q->setAcceptHoverEvents(false);
        if (!newWidget)
            q->update();
    }
    if (!newWidget)
        return;
    if (!newWidget->isWindow()) {
        QWExtra *extra = newWidget->parentWidget()->d_func()->extra;
        if (!extra || !extra->proxyWidget)  {
            qWarning("QGraphicsProxyWidget::setWidget: cannot embed widget %p "
                     "which is not a toplevel widget, and is not a child of an embedded widget", newWidget);
            return;
        }
    }

    // Register this proxy within the widget's private.
    // ### This is a bit backdoorish
    QWExtra *extra = newWidget->d_func()->extra;
    if (!extra) {
        newWidget->d_func()->createExtra();
        extra = newWidget->d_func()->extra;
    }
    QGraphicsProxyWidget **proxyWidget = &extra->proxyWidget;
    if (*proxyWidget) {
        if (*proxyWidget != q) {
            qWarning("QGraphicsProxyWidget::setWidget: cannot embed widget %p"
                        "; already embedded", newWidget);
        }
        return;
    }
    *proxyWidget = q;

    newWidget->setAttribute(Qt::WA_DontShowOnScreen);
    newWidget->ensurePolished();
    // Do not wait for this widget to close before the app closes ###
    // shouldn't this widget inherit the attribute?
    newWidget->setAttribute(Qt::WA_QuitOnClose, false);
    q->setAcceptHoverEvents(true);

    if (newWidget->testAttribute(Qt::WA_NoSystemBackground))
        q->setAttribute(Qt::WA_NoSystemBackground);
    if (newWidget->testAttribute(Qt::WA_OpaquePaintEvent))
        q->setAttribute(Qt::WA_OpaquePaintEvent);

    widget = newWidget;

    // Changes only go from the widget to the proxy.
    enabledChangeMode = QGraphicsProxyWidgetPrivate::WidgetToProxyMode;
    visibleChangeMode = QGraphicsProxyWidgetPrivate::WidgetToProxyMode;
    posChangeMode = QGraphicsProxyWidgetPrivate::WidgetToProxyMode;
    sizeChangeMode = QGraphicsProxyWidgetPrivate::WidgetToProxyMode;

    if ((autoShow && !newWidget->testAttribute(Qt::WA_WState_ExplicitShowHide)) || !newWidget->testAttribute(Qt::WA_WState_Hidden)) {
        newWidget->show();
    }

    // Copy the state from the widget onto the proxy.
#ifndef QT_NO_CURSOR
    if (newWidget->testAttribute(Qt::WA_SetCursor))
        q->setCursor(widget->cursor());
#endif
    q->setEnabled(newWidget->isEnabled());
    q->setVisible(newWidget->isVisible());
    q->setLayoutDirection(newWidget->layoutDirection());
    if (newWidget->testAttribute(Qt::WA_SetStyle))
        q->setStyle(widget->style());

    resolveFont(inheritedFontResolveMask);
    resolvePalette(inheritedPaletteResolveMask);

    if (!newWidget->testAttribute(Qt::WA_Resized))
        newWidget->adjustSize();

    int left, top, right, bottom;
    newWidget->getContentsMargins(&left, &top, &right, &bottom);
    q->setContentsMargins(left, top, right, bottom);
    q->setWindowTitle(newWidget->windowTitle());

    // size policies and constraints..
    q->setSizePolicy(newWidget->sizePolicy());
    QSize sz = newWidget->minimumSize();
    q->setMinimumSize(sz.isNull() ? QSizeF() : QSizeF(sz));
    sz = newWidget->maximumSize();
    q->setMaximumSize(sz.isNull() ? QSizeF() : QSizeF(sz));

    updateProxyGeometryFromWidget();

    updateProxyInputMethodAcceptanceFromWidget();

    // Hook up the event filter to keep the state up to date.
    newWidget->installEventFilter(q);
    QObject::connect(newWidget, SIGNAL(destroyed()), q, SLOT(_q_removeWidgetSlot()));

    // Changes no longer go only from the widget to the proxy.
    enabledChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
    visibleChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
    posChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
    sizeChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
}

QWidget *QGraphicsProxyWidget::widget() const
{
    Q_D(const QGraphicsProxyWidget);
    return d->widget;
}

QRectF QGraphicsProxyWidget::subWidgetRect(const QWidget *widget) const
{
    Q_D(const QGraphicsProxyWidget);
    if (!widget || !d->widget)
        return QRectF();
    if (d->widget == widget || d->widget->isAncestorOf(widget))
        return QRectF(widget->mapTo(d->widget, QPoint(0, 0)), widget->size());
    return QRectF();
}

void QGraphicsProxyWidget::setGeometry(const QRectF &rect)
{
    Q_D(QGraphicsProxyWidget);
    bool proxyResizesWidget = !d->posChangeMode && !d->sizeChangeMode;
    if (proxyResizesWidget) {
        d->posChangeMode = QGraphicsProxyWidgetPrivate::ProxyToWidgetMode;
        d->sizeChangeMode = QGraphicsProxyWidgetPrivate::ProxyToWidgetMode;
    }
    QGraphicsWidget::setGeometry(rect);
    if (proxyResizesWidget) {
        d->posChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
        d->sizeChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
    }
}

QVariant QGraphicsProxyWidget::itemChange(GraphicsItemChange change,
                                          const QVariant &value)
{
    Q_D(QGraphicsProxyWidget);

    switch (change) {
    case ItemPositionChange:
        // The item's position is either changed directly on the proxy, in
        // which case the position change should propagate to the widget,
        // otherwise it happens as a side effect when filtering QEvent::Move.
        if (!d->posChangeMode)
            d->posChangeMode = QGraphicsProxyWidgetPrivate::ProxyToWidgetMode;
        break;
    case ItemPositionHasChanged:
        // Move the internal widget if we're in widget-to-proxy
        // mode. Otherwise the widget has already moved.
        if (d->widget && d->posChangeMode != QGraphicsProxyWidgetPrivate::WidgetToProxyMode)
            d->widget->move(value.toPoint());
        if (d->posChangeMode == QGraphicsProxyWidgetPrivate::ProxyToWidgetMode)
            d->posChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
        break;
    case ItemVisibleChange:
        if (!d->visibleChangeMode)
            d->visibleChangeMode = QGraphicsProxyWidgetPrivate::ProxyToWidgetMode;
        break;
    case ItemVisibleHasChanged:
        if (d->widget && d->visibleChangeMode != QGraphicsProxyWidgetPrivate::WidgetToProxyMode)
            d->widget->setVisible(isVisible());
        if (d->visibleChangeMode == QGraphicsProxyWidgetPrivate::ProxyToWidgetMode)
            d->visibleChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
        break;
    case ItemEnabledChange:
        if (!d->enabledChangeMode)
            d->enabledChangeMode = QGraphicsProxyWidgetPrivate::ProxyToWidgetMode;
        break;
    case ItemEnabledHasChanged:
        if (d->widget && d->enabledChangeMode != QGraphicsProxyWidgetPrivate::WidgetToProxyMode)
            d->widget->setEnabled(isEnabled());
        if (d->enabledChangeMode == QGraphicsProxyWidgetPrivate::ProxyToWidgetMode)
            d->enabledChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
        break;
    default:
        break;
    }
    return QGraphicsWidget::itemChange(change, value);
}

bool QGraphicsProxyWidget::event(QEvent *event)
{
    Q_D(QGraphicsProxyWidget);
    if (!d->widget)
        return QGraphicsWidget::event(event);

    switch (event->type()) {
    case QEvent::StyleChange:
        // Propagate style changes to the embedded widget.
        if (!d->styleChangeMode) {
            d->styleChangeMode = QGraphicsProxyWidgetPrivate::ProxyToWidgetMode;
            d->widget->setStyle(style());
            d->styleChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
        }
        break;
    case QEvent::FontChange: {
        // Propagate to widget.
        QWidgetPrivate *wd = d->widget->d_func();
        int mask = d->font.resolve() | d->inheritedFontResolveMask;
        wd->inheritedFontResolveMask = mask;
        wd->resolveFont();
        break;
    }
    case QEvent::PaletteChange: {
        // Propagate to widget.
        QWidgetPrivate *wd = d->widget->d_func();
        int mask = d->palette.resolve() | d->inheritedPaletteResolveMask;
        wd->inheritedPaletteResolveMask = mask;
        wd->resolvePalette();
        break;
    }
    case QEvent::InputMethod: {
        // Forward input method events if the focus widget enables
        // input methods.
        // ### Qt 4.5: this code must also go into a reimplementation
        // of inputMethodEvent().
        QWidget *focusWidget = d->widget->focusWidget();
        if (focusWidget && focusWidget->testAttribute(Qt::WA_InputMethodEnabled))
            QApplication::sendEvent(focusWidget, event);
        break;
    }
    case QEvent::ShortcutOverride: {
        QWidget *focusWidget = d->widget->focusWidget();
        while (focusWidget) {
            QApplication::sendEvent(focusWidget, event);
            if (event->isAccepted())
                return true;
            focusWidget = focusWidget->parentWidget();
        }
        return false;
    }
    case QEvent::KeyPress: {
        QKeyEvent *k = static_cast<QKeyEvent *>(event);
        if (k->key() == Qt::Key_Tab || k->key() == Qt::Key_Backtab) {
            if (!(k->modifiers() & (Qt::ControlModifier | Qt::AltModifier))) {  //### Add MetaModifier?
                QWidget *focusWidget = d->widget->focusWidget();
                while (focusWidget) {
                    bool res = QApplication::sendEvent(focusWidget, event);
                    if ((res && event->isAccepted()) || (isWindow() && focusWidget == d->widget)) {
                        event->accept();
                        break;
                    }
                    focusWidget = focusWidget->parentWidget();
                }
                return true;
            }
        }
        break;
    }
#ifndef QT_NO_TOOLTIP
    case QEvent::GraphicsSceneHelp: {
        // Propagate the help event (for tooltip) to the widget under mouse
        if (d->lastWidgetUnderMouse) {
            QGraphicsSceneHelpEvent *he = static_cast<QGraphicsSceneHelpEvent *>(event);
            QPoint pos = d->mapToReceiver(mapFromScene(he->scenePos()), d->lastWidgetUnderMouse).toPoint();
            QHelpEvent e(QEvent::ToolTip, pos, he->screenPos());
            QApplication::sendEvent(d->lastWidgetUnderMouse, &e);
            event->setAccepted(e.isAccepted());
            return e.isAccepted();
        }
        break;
    }
    case QEvent::ToolTipChange: {
        // Propagate tooltip change to the widget
        if (!d->tooltipChangeMode) {
            d->tooltipChangeMode = QGraphicsProxyWidgetPrivate::ProxyToWidgetMode;
            d->widget->setToolTip(toolTip());
            d->tooltipChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
        }
        break;
    }
#endif
    default:
        break;
    }
    return QGraphicsWidget::event(event);
}

bool QGraphicsProxyWidget::eventFilter(QObject *object, QEvent *event)
{
    Q_D(QGraphicsProxyWidget);

    if (object == d->widget) {
        switch (event->type()) {
        case QEvent::LayoutRequest:
            updateGeometry();
            break;
         case QEvent::Resize:
             // If the widget resizes itself, we resize the proxy too.
             // Prevent feed-back by checking the geometry change mode.
             if (!d->sizeChangeMode)
                 d->updateProxyGeometryFromWidget();
            break;
         case QEvent::Move:
             // If the widget moves itself, we move the proxy too.  Prevent
             // feed-back by checking the geometry change mode.
             if (!d->posChangeMode)
                 d->updateProxyGeometryFromWidget();
            break;
        case QEvent::Hide:
        case QEvent::Show:
            // If the widget toggles its visible state, the proxy will follow.
            if (!d->visibleChangeMode) {
                d->visibleChangeMode = QGraphicsProxyWidgetPrivate::WidgetToProxyMode;
                setVisible(event->type() == QEvent::Show);
                d->visibleChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
            }
            break;
        case QEvent::EnabledChange:
            // If the widget toggles its enabled state, the proxy will follow.
            if (!d->enabledChangeMode) {
                d->enabledChangeMode = QGraphicsProxyWidgetPrivate::WidgetToProxyMode;
                setEnabled(d->widget->isEnabled());
                d->enabledChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
            }
            break;
        case QEvent::StyleChange:
            // Propagate style changes to the proxy.
            if (!d->styleChangeMode) {
                d->styleChangeMode = QGraphicsProxyWidgetPrivate::WidgetToProxyMode;
                setStyle(d->widget->style());
                d->styleChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
            }
            break;
#ifndef QT_NO_TOOLTIP
        case QEvent::ToolTipChange:
            // Propagate tooltip change to the proxy.
            if (!d->tooltipChangeMode) {
                d->tooltipChangeMode = QGraphicsProxyWidgetPrivate::WidgetToProxyMode;
                setToolTip(d->widget->toolTip());
                d->tooltipChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
            }
            break;
#endif
        default:
            break;
        }
    }
    return QGraphicsWidget::eventFilter(object, event);
}

void QGraphicsProxyWidget::showEvent(QShowEvent *event)
{
    Q_UNUSED(event);
}

void QGraphicsProxyWidget::hideEvent(QHideEvent *event)
{
    Q_UNUSED(event);
}

#ifndef QT_NO_CONTEXTMENU

void QGraphicsProxyWidget::contextMenuEvent(QGraphicsSceneContextMenuEvent *event)
{
    Q_D(QGraphicsProxyWidget);
    if (!event || !d->widget || !d->widget->isVisible() || !hasFocus())
        return;

    // Find widget position and receiver.
    QPointF pos = event->pos();
    QPointer<QWidget> alienWidget = d->widget->childAt(pos.toPoint());
    QPointer<QWidget> receiver =  alienWidget ? alienWidget : d->widget;

    // Map event position from us to the receiver
    pos = d->mapToReceiver(pos, receiver);

    QPoint globalPos = receiver->mapToGlobal(pos.toPoint());
    //If the receiver by-pass the proxy its popups
    //will be top level QWidgets therefore they need
    //the screen position. mapToGlobal expect the widget to
    //have proper coordinates in regards of the windowing system
    //but it's not true because the widget is embedded.
    if (bypassGraphicsProxyWidget(receiver))
        globalPos = event->screenPos();

    // Send mouse event. ### Doesn't propagate the event.
    QContextMenuEvent contextMenuEvent(QContextMenuEvent::Reason(event->reason()),
                                       pos.toPoint(), globalPos, event->modifiers());
    QApplication::sendEvent(receiver, &contextMenuEvent);

    event->setAccepted(contextMenuEvent.isAccepted());
}
#endif // QT_NO_CONTEXTMENU

#ifndef QT_NO_DRAGANDDROP

void QGraphicsProxyWidget::dragEnterEvent(QGraphicsSceneDragDropEvent *event)
{
#ifdef QT_NO_DRAGANDDROP
    Q_UNUSED(event);
#else
    Q_D(QGraphicsProxyWidget);
    if (!d->widget)
        return;

    QDragEnterEvent proxyDragEnter(event->pos().toPoint(), event->dropAction(), event->mimeData(), event->buttons(), event->modifiers());
    proxyDragEnter.setAccepted(event->isAccepted());
    QApplication::sendEvent(d->widget, &proxyDragEnter);
    event->setAccepted(proxyDragEnter.isAccepted());
    if (proxyDragEnter.isAccepted())    // we discard answerRect
        event->setDropAction(proxyDragEnter.dropAction());
#endif
}
void QGraphicsProxyWidget::dragLeaveEvent(QGraphicsSceneDragDropEvent *event)
{
    Q_UNUSED(event);
#ifndef QT_NO_DRAGANDDROP
    Q_D(QGraphicsProxyWidget);
    if (!d->widget || !d->dragDropWidget)
        return;
    QDragLeaveEvent proxyDragLeave;
    QApplication::sendEvent(d->dragDropWidget, &proxyDragLeave);
    d->dragDropWidget = 0;
#endif
}

void QGraphicsProxyWidget::dragMoveEvent(QGraphicsSceneDragDropEvent *event)
{
#ifdef QT_NO_DRAGANDDROP
    Q_UNUSED(event);
#else
    Q_D(QGraphicsProxyWidget);
    if (!d->widget)
        return;
    QPointF p = event->pos();
    event->ignore();
    QPointer<QWidget> subWidget = d->widget->childAt(p.toPoint());
    QPointer<QWidget> receiver =  subWidget ? subWidget : d->widget;
    bool eventDelivered = false;
    for (; receiver; receiver = receiver->parentWidget()) {
        if (!receiver->isEnabled() || !receiver->acceptDrops())
            continue;
        // Map event position from us to the receiver
        QPoint receiverPos = d->mapToReceiver(p, receiver).toPoint();
        if (receiver != d->dragDropWidget) {
            // Try to enter before we leave
            QDragEnterEvent dragEnter(receiverPos, event->possibleActions(), event->mimeData(), event->buttons(), event->modifiers());
            dragEnter.setDropAction(event->proposedAction());
            QApplication::sendEvent(receiver, &dragEnter);
            event->setAccepted(dragEnter.isAccepted());
            event->setDropAction(dragEnter.dropAction());
            if (!event->isAccepted()) {
                // propagate to the parent widget
                continue;
            }

            d->lastDropAction = event->dropAction();

            if (d->dragDropWidget) {
                QDragLeaveEvent dragLeave;
                QApplication::sendEvent(d->dragDropWidget, &dragLeave);
            }
            d->dragDropWidget = receiver;
        }

        QDragMoveEvent dragMove(receiverPos, event->possibleActions(), event->mimeData(), event->buttons(), event->modifiers());
        event->setDropAction(d->lastDropAction);
        QApplication::sendEvent(receiver, &dragMove);
        event->setAccepted(dragMove.isAccepted());
        event->setDropAction(dragMove.dropAction());
        if (event->isAccepted())
            d->lastDropAction = event->dropAction();
        eventDelivered = true;
        break;
    }

    if (!eventDelivered) {
        if (d->dragDropWidget) {
            // Leave the last drag drop item
            QDragLeaveEvent dragLeave;
            QApplication::sendEvent(d->dragDropWidget, &dragLeave);
            d->dragDropWidget = 0;
        }
        // Propagate
        event->setDropAction(Qt::IgnoreAction);
    }
#endif
}

void QGraphicsProxyWidget::dropEvent(QGraphicsSceneDragDropEvent *event)
{
#ifdef QT_NO_DRAGANDDROP
    Q_UNUSED(event);
#else
    Q_D(QGraphicsProxyWidget);
    if (d->widget && d->dragDropWidget) {
        QPoint widgetPos = d->mapToReceiver(event->pos(), d->dragDropWidget).toPoint();
        QDropEvent dropEvent(widgetPos, event->possibleActions(), event->mimeData(), event->buttons(), event->modifiers());
        QApplication::sendEvent(d->dragDropWidget, &dropEvent);
        event->setAccepted(dropEvent.isAccepted());
        d->dragDropWidget = 0;
    }
#endif
}
#endif

void QGraphicsProxyWidget::hoverEnterEvent(QGraphicsSceneHoverEvent *event)
{
    Q_UNUSED(event);
}

void QGraphicsProxyWidget::hoverLeaveEvent(QGraphicsSceneHoverEvent *event)
{
    Q_UNUSED(event);
    Q_D(QGraphicsProxyWidget);
    // If hoverMove was compressed away, make sure we update properly here.
    if (d->lastWidgetUnderMouse) {
        QApplicationPrivate::dispatchEnterLeave(0, d->lastWidgetUnderMouse);
        d->lastWidgetUnderMouse = 0;
    }
}

void QGraphicsProxyWidget::hoverMoveEvent(QGraphicsSceneHoverEvent *event)
{
    Q_D(QGraphicsProxyWidget);
#ifdef GRAPHICSPROXYWIDGET_DEBUG
    qDebug() << "QGraphicsProxyWidget::hoverMoveEvent";
#endif
    // Ignore events on the window frame.
    if (!d->widget || !rect().contains(event->pos())) {
        if (d->lastWidgetUnderMouse) {
            QApplicationPrivate::dispatchEnterLeave(0, d->lastWidgetUnderMouse);
            d->lastWidgetUnderMouse = 0;
        }
        return;
    }

    d->embeddedMouseGrabber = 0;
    d->sendWidgetMouseEvent(event);
}

void QGraphicsProxyWidget::grabMouseEvent(QEvent *event)
{
    Q_UNUSED(event);
}

void QGraphicsProxyWidget::ungrabMouseEvent(QEvent *event)
{
    Q_D(QGraphicsProxyWidget);
    Q_UNUSED(event);
    d->embeddedMouseGrabber = 0;
}

void QGraphicsProxyWidget::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{
    Q_D(QGraphicsProxyWidget);
#ifdef GRAPHICSPROXYWIDGET_DEBUG
    qDebug() << "QGraphicsProxyWidget::mouseMoveEvent";
#endif
    d->sendWidgetMouseEvent(event);
}

void QGraphicsProxyWidget::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
    Q_D(QGraphicsProxyWidget);
#ifdef GRAPHICSPROXYWIDGET_DEBUG
    qDebug() << "QGraphicsProxyWidget::mousePressEvent";
#endif
    d->sendWidgetMouseEvent(event);
}

void QGraphicsProxyWidget::mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event)
{
    Q_D(QGraphicsProxyWidget);
#ifdef GRAPHICSPROXYWIDGET_DEBUG
    qDebug() << "QGraphicsProxyWidget::mouseDoubleClickEvent";
#endif
    d->sendWidgetMouseEvent(event);
}

#ifndef QT_NO_WHEELEVENT
void QGraphicsProxyWidget::wheelEvent(QGraphicsSceneWheelEvent *event)
{
    Q_D(QGraphicsProxyWidget);
#ifdef GRAPHICSPROXYWIDGET_DEBUG
    qDebug() << "QGraphicsProxyWidget::wheelEvent";
#endif
    if (!d->widget)
        return;

    QPointF pos = event->pos();
    QPointer<QWidget> receiver = d->widget->childAt(pos.toPoint());
    if (!receiver)
        receiver = d->widget;

    // Map event position from us to the receiver
    pos = d->mapToReceiver(pos, receiver);

    // Send mouse event.
    QWheelEvent wheelEvent(pos.toPoint(), event->screenPos(), event->delta(),
                           event->buttons(), event->modifiers(), event->orientation());
    QPointer<QWidget> focusWidget = d->widget->focusWidget();
    extern bool qt_sendSpontaneousEvent(QObject *, QEvent *);
    qt_sendSpontaneousEvent(receiver, &wheelEvent);
    event->setAccepted(wheelEvent.isAccepted());

    // ### Remove, this should be done by proper focusIn/focusOut events.
    if (focusWidget && !focusWidget->hasFocus()) {
        focusWidget->update();
        focusWidget = d->widget->focusWidget();
        if (focusWidget && focusWidget->hasFocus())
            focusWidget->update();
    }
}
#endif

void QGraphicsProxyWidget::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
{
    Q_D(QGraphicsProxyWidget);
#ifdef GRAPHICSPROXYWIDGET_DEBUG
    qDebug() << "QGraphicsProxyWidget::mouseReleaseEvent";
#endif
    d->sendWidgetMouseEvent(event);
}

void QGraphicsProxyWidget::keyPressEvent(QKeyEvent *event)
{
    Q_D(QGraphicsProxyWidget);
#ifdef GRAPHICSPROXYWIDGET_DEBUG
    qDebug() << "QGraphicsProxyWidget::keyPressEvent";
#endif
    d->sendWidgetKeyEvent(event);
}

void QGraphicsProxyWidget::keyReleaseEvent(QKeyEvent *event)
{
    Q_D(QGraphicsProxyWidget);
#ifdef GRAPHICSPROXYWIDGET_DEBUG
    qDebug() << "QGraphicsProxyWidget::keyReleaseEvent";
#endif
    d->sendWidgetKeyEvent(event);
}

void QGraphicsProxyWidget::focusInEvent(QFocusEvent *event)
{
#ifdef GRAPHICSPROXYWIDGET_DEBUG
    qDebug() << "QGraphicsProxyWidget::focusInEvent";
#endif
    Q_D(QGraphicsProxyWidget);

    if (d->focusFromWidgetToProxy) {
        // Prevent recursion when the proxy autogains focus through the
        // embedded widget calling setFocus(). ### Could be done with event
        // filter on FocusIn instead?
        return;
    }

    d->proxyIsGivingFocus = true;

    switch (event->reason()) {
    case Qt::TabFocusReason: {
    if (QWidget *focusChild = d->findFocusChild(0, true))
            focusChild->setFocus(event->reason());
        break;
    }
    case Qt::BacktabFocusReason:
    if (QWidget *focusChild = d->findFocusChild(0, false))
            focusChild->setFocus(event->reason());
        break;
    default:
    if (d->widget && d->widget->focusWidget()) {
        d->widget->focusWidget()->setFocus(event->reason());
        }
        break;
    }

    d->proxyIsGivingFocus = false;
}

void QGraphicsProxyWidget::focusOutEvent(QFocusEvent *event)
{
#ifdef GRAPHICSPROXYWIDGET_DEBUG
    qDebug() << "QGraphicsProxyWidget::focusOutEvent";
#endif
    Q_D(QGraphicsProxyWidget);
    if (d->widget) {
        // We need to explicitly remove subfocus from the embedded widget's
        // focus widget.
        if (QWidget *focusWidget = d->widget->focusWidget())
            d->removeSubFocusHelper(focusWidget, event->reason());
    }
}

bool QGraphicsProxyWidget::focusNextPrevChild(bool next)
{
    Q_D(QGraphicsProxyWidget);
    if (!d->widget || !d->scene)
        return QGraphicsWidget::focusNextPrevChild(next);

    Qt::FocusReason reason = next ? Qt::TabFocusReason : Qt::BacktabFocusReason;
    QWidget *lastFocusChild = d->widget->focusWidget();
    if (QWidget *newFocusChild = d->findFocusChild(lastFocusChild, next)) {
    newFocusChild->setFocus(reason);
    return true;
    }

    return QGraphicsWidget::focusNextPrevChild(next);
}

QSizeF QGraphicsProxyWidget::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
{
    Q_D(const QGraphicsProxyWidget);
    if (!d->widget)
        return QGraphicsWidget::sizeHint(which, constraint);

    QSizeF sh;
    switch (which) {
    case Qt::PreferredSize:
        if (QLayout *l = d->widget->layout())
            sh = l->sizeHint();
        else
            sh = d->widget->sizeHint();
        break;
    case Qt::MinimumSize:
        if (QLayout *l = d->widget->layout())
            sh = l->minimumSize();
        else
            sh = d->widget->minimumSizeHint();
        break;
    case Qt::MaximumSize:
        if (QLayout *l = d->widget->layout())
            sh = l->maximumSize();
        else
            sh = QSizeF(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX);
        break;
    case Qt::MinimumDescent:
        sh = constraint;
        break;
    default:
        break;
    }
    return sh;
}

void QGraphicsProxyWidget::resizeEvent(QGraphicsSceneResizeEvent *event)
{
    Q_D(QGraphicsProxyWidget);
    if (d->widget) {
        if (d->sizeChangeMode != QGraphicsProxyWidgetPrivate::WidgetToProxyMode)
            d->widget->resize(event->newSize().toSize());
    }
    QGraphicsWidget::resizeEvent(event);
}

void QGraphicsProxyWidget::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
    Q_D(QGraphicsProxyWidget);
    Q_UNUSED(widget);
    if (!d->widget || !d->widget->isVisible())
        return;

    // Filter out repaints on the window frame.
    const QRect exposedWidgetRect = (option->exposedRect & rect()).toAlignedRect();
    if (exposedWidgetRect.isEmpty())
        return;

    // Disable QPainter's default pen being cosmetic. This allows widgets and
    // styles to follow Qt's existing defaults without getting ugly cosmetic
    // lines when scaled.
    bool restore = !(painter->renderHints() & QPainter::NonCosmeticDefaultPen);
    painter->setRenderHints(QPainter::NonCosmeticDefaultPen, true);

    d->widget->render(painter, exposedWidgetRect.topLeft(), exposedWidgetRect);

    // Restore the render hints if necessary.
    if (restore)
        painter->setRenderHints(QPainter::NonCosmeticDefaultPen, false);
}

int QGraphicsProxyWidget::type() const
{
    return Type;
}

QGraphicsProxyWidget *QGraphicsProxyWidget::createProxyForChildWidget(QWidget *child)
{
    QGraphicsProxyWidget *proxy = child->graphicsProxyWidget();
    if (proxy)
        return proxy;
    if (!child->parentWidget()) {
        qWarning("QGraphicsProxyWidget::createProxyForChildWidget: top-level widget not in a QGraphicsScene");
        return 0;
    }

    QGraphicsProxyWidget *parentProxy = createProxyForChildWidget(child->parentWidget());
    if (!parentProxy)
        return 0;

    if (!QMetaObject::invokeMethod(parentProxy, "newProxyWidget",  Qt::DirectConnection,
         Q_RETURN_ARG(QGraphicsProxyWidget*, proxy), Q_ARG(const QWidget*, child)))
        return 0;
    proxy->setParent(parentProxy);
    proxy->setWidget(child);
    return proxy;
}

QGraphicsProxyWidget *QGraphicsProxyWidget::newProxyWidget(const QWidget *)
{
    return new QGraphicsProxyWidget(this);
}



QT_END_NAMESPACE

#include "moc_qgraphicsproxywidget.cpp"

#endif //QT_NO_GRAPHICSVIEW