QXlibScreen Class Reference

#include <qxlibscreen.h>

Inheritance diagram for QXlibScreen:

Public Slots
void	eventDispatcher ()
Public Slots inherited from QObject
void	deleteLater ()
	Schedules this object for deletion. More...

Public Functions
unsigned long	blackPixel ()
Visual *	defaultVisual () const
int	depth () const
	Reimplement in subclass to return current depth of the screen. More...
QXlibDisplay *	display () const
QImage::Format	format () const
	Reimplement in subclass to return the image format which corresponds to the screen format. More...
QRect	geometry () const
	Reimplement in subclass to return the pixel geometry of the screen. More...
QImage	grabWindow (Window window, int x, int y, int w, int h)
bool	handleEvent (XEvent *xe)
QXlibKeyboard *	keyboard () const
QSize	physicalSize () const
	Reimplement this function in subclass to return the physical size of the screen. More...
	QXlibScreen ()
Window	rootWindow ()
bool	waitForClipboardEvent (Window win, int type, XEvent *event, int timeout)
unsigned long	whitePixel ()
int	xScreenNumber () const
	~QXlibScreen ()
Public Functions inherited from QPlatformScreen
virtual QRect	availableGeometry () const
	Reimplement in subclass to return the pixel geometry of the available space This normally is the desktop screen minus the task manager, global menubar etc. More...
virtual void	setDirty (const QRect &)
virtual QWidget *	topLevelAt (const QPoint &point) const
	Return the given top level widget for a given position. More...
virtual	~QPlatformScreen ()
Public Functions inherited from QObject
bool	blockSignals (bool b)
	If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it). More...
const QObjectList &	children () const
	Returns a list of child objects. More...
bool	connect (const QObject *sender, const char *signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const
bool	disconnect (const char *signal=0, const QObject *receiver=0, const char *member=0)
bool	disconnect (const QObject *receiver, const char *member=0)
void	dumpObjectInfo ()
	Dumps information about signal connections, etc. More...
void	dumpObjectTree ()
	Dumps a tree of children to the debug output. More...
QList< QByteArray >	dynamicPropertyNames () const
	Returns the names of all properties that were dynamically added to the object using setProperty(). More...
virtual bool	event (QEvent *)
	This virtual function receives events to an object and should return true if the event e was recognized and processed. More...
virtual bool	eventFilter (QObject *, QEvent *)
	Filters events if this object has been installed as an event filter for the watched object. More...
template<typename T >
T	findChild (const QString &aName=QString()) const
	Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. More...
template<typename T >
QList< T >	findChildren (const QString &aName=QString()) const
	Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. More...
template<typename T >
QList< T >	findChildren (const QRegExp &re) const
bool	inherits (const char *classname) const
	Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false. More...
void	installEventFilter (QObject *)
	Installs an event filter filterObj on this object. More...
bool	isWidgetType () const
	Returns true if the object is a widget; otherwise returns false. More...
void	killTimer (int id)
	Kills the timer with timer identifier, id. More...
virtual const QMetaObject *	metaObject () const
	Returns a pointer to the meta-object of this object. More...
void	moveToThread (QThread *thread)
	Changes the thread affinity for this object and its children. More...
QString	objectName () const
QObject *	parent () const
	Returns a pointer to the parent object. More...
QVariant	property (const char *name) const
	Returns the value of the object's name property. More...
Q_INVOKABLE	QObject (QObject *parent=0)
	Constructs an object with parent object parent. More...
void	removeEventFilter (QObject *)
	Removes an event filter object obj from this object. More...
void	setObjectName (const QString &name)
void	setParent (QObject *)
	Makes the object a child of parent. More...
bool	setProperty (const char *name, const QVariant &value)
	Sets the value of the object's name property to value. More...
void	setUserData (uint id, QObjectUserData *data)
bool	signalsBlocked () const
	Returns true if signals are blocked; otherwise returns false. More...
int	startTimer (int interval)
	Starts a timer and returns a timer identifier, or returns zero if it could not start a timer. More...
QThread *	thread () const
	Returns the thread in which the object lives. More...
QObjectUserData *	userData (uint id) const
virtual	~QObject ()
	Destroys the object, deleting all its child objects. More...

Static Public Functions
static QXlibScreen *	testLiteScreenForWidget (QWidget *widget)
Static Public Functions inherited from QPlatformScreen
static QPlatformScreen *	platformScreenForWidget (const QWidget *widget)
Static Public Functions inherited from QObject
static bool	connect (const QObject *sender, const char *signal, const QObject *receiver, const char *member, Qt::ConnectionType=Qt::AutoConnection)
	Creates a connection of the given type from the signal in the sender object to the method in the receiver object. More...
static bool	connect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)
static bool	disconnect (const QObject *sender, const char *signal, const QObject *receiver, const char *member)
	Disconnects signal in object sender from method in object receiver. More...
static bool	disconnect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &member)
static uint	registerUserData ()
static QString	tr (const char *sourceText, const char *comment=0, int n=-1)
static QString	trUtf8 (const char *sourceText, const char *comment=0, int n=-1)

Private Functions
void	handleSelectionRequest (XEvent *event)

Properties
QXlibCursor *	mCursor
int	mDepth
QXlibDisplay *	mDisplay
QImage::Format	mFormat
QRect	mGeometry
QXlibKeyboard *	mKeyboard
QSize	mPhysicalSize
int	mScreen

Additional Inherited Members
Signals inherited from QObject
void	destroyed (QObject *=0)
	This signal is emitted immediately before the object obj is destroyed, and can not be blocked. More...
Static Public Variables inherited from QObject
static const QMetaObject	staticMetaObject
	This variable stores the meta-object for the class. More...
Protected Functions inherited from QObject
virtual void	childEvent (QChildEvent *)
	This event handler can be reimplemented in a subclass to receive child events. More...
virtual void	connectNotify (const char *signal)
	This virtual function is called when something has been connected to signal in this object. More...
virtual void	customEvent (QEvent *)
	This event handler can be reimplemented in a subclass to receive custom events. More...
virtual void	disconnectNotify (const char *signal)
	This virtual function is called when something has been disconnected from signal in this object. More...
	QObject (QObjectPrivate &dd, QObject *parent=0)
int	receivers (const char *signal) const
	Returns the number of receivers connected to the signal. More...
QObject *	sender () const
	Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns 0. More...
int	senderSignalIndex () const
virtual void	timerEvent (QTimerEvent *)
	This event handler can be reimplemented in a subclass to receive timer events for the object. More...
Protected Variables inherited from QObject
QScopedPointer< QObjectData >	d_ptr
Static Protected Variables inherited from QObject
static const QMetaObject	staticQtMetaObject
Related Functions inherited from QObject
T	qFindChildqFindChildren (const QObject *obj, const QString &name)()
QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QString &name)()
QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QRegExp &regExp)()
T *	qobject_cast (QObject *object)
	QObjectList
void *	qt_find_obj_child (QObject *parent, const char *type, const QString &name)
	Returns a pointer to the object named name that inherits type and with a given parent. More...

Detailed Description

Definition at line 54 of file qxlibscreen.h.

Constructors and Destructors

QXlibScreen()

QXlibScreen::QXlibScreen

(

)

Definition at line 192 of file qxlibscreen.cpp.

        : mFormat(QImage::Format_RGB32)
#if !defined(QT_NO_OPENGL) && defined(QT_OPENGL_ES_2)
        , mEGLDisplay(0)
#endif
{
    char *display_name = getenv("DISPLAY");
    Display *display = XOpenDisplay(display_name);
    mDisplay = new QXlibDisplay(display);


#ifndef DONT_USE_MIT_SHM
    int MIT_SHM_extension_supported = XShmQueryExtension (mDisplay->nativeDisplay());
    Q_ASSERT(MIT_SHM_extension_supported == True);
#endif
    original_x_errhandler = XSetErrorHandler(qt_x_errhandler);

    if (qgetenv("DO_X_SYNCHRONIZE").toInt())
        XSynchronize(mDisplay->nativeDisplay(), true);

    mScreen = DefaultScreen(mDisplay->nativeDisplay());
    XSelectInput(mDisplay->nativeDisplay(),rootWindow(), KeymapStateMask | EnterWindowMask | LeaveWindowMask | PropertyChangeMask);
    int width = DisplayWidth(mDisplay->nativeDisplay(), mScreen);
    int height = DisplayHeight(mDisplay->nativeDisplay(), mScreen);
    mGeometry = QRect(0,0,width,height);

    int physicalWidth = DisplayWidthMM(mDisplay->nativeDisplay(), mScreen);
    int physicalHeight = DisplayHeightMM(mDisplay->nativeDisplay(), mScreen);
    mPhysicalSize = QSize(physicalWidth,physicalHeight);

    int xSocketNumber = XConnectionNumber(mDisplay->nativeDisplay());

    mDepth = DefaultDepth(mDisplay->nativeDisplay(),mScreen);
#ifdef MYX11_DEBUG
    qDebug() << "X socket:"<< xSocketNumber;
#endif
    QSocketNotifier *sock = new QSocketNotifier(xSocketNumber, QSocketNotifier::Read, this);
    connect(sock, SIGNAL(activated(int)), this, SLOT(eventDispatcher()));

    mCursor = new QXlibCursor(this);
    mKeyboard = new QXlibKeyboard(this);
}

~QXlibScreen()

QXlibScreen::~QXlibScreen

(

)

Definition at line 235 of file qxlibscreen.cpp.

{
    delete mCursor;
    delete mDisplay;
}

Functions

blackPixel()

unsigned long QXlibScreen::blackPixel

(

)

Definition at line 246 of file qxlibscreen.cpp.

Referenced by QXlibClipboard::owner(), physicalSize(), QXlibWindow::QXlibWindow(), and QXlibClipboard::requestor().

{
    return BlackPixel(mDisplay->nativeDisplay(), mScreen);
}

defaultVisual()

Visual * QXlibScreen::defaultVisual

(

)

const

Definition at line 471 of file qxlibscreen.cpp.

Referenced by physicalSize(), and QXlibWindow::QXlibWindow().

{
    return DefaultVisual(display()->nativeDisplay(), xScreenNumber());
}

depth()

int QXlibScreen::depth ( ) const

inlinevirtual

Reimplement in subclass to return current depth of the screen.

Implements QPlatformScreen.

Definition at line 63 of file qxlibscreen.h.

Referenced by QXlibWindow::correctColorBuffers(), and QXlibWindow::QXlibWindow().

{ return mDepth; }

display()

QXlibDisplay * QXlibScreen::display

(

)

const

Definition at line 461 of file qxlibscreen.cpp.

Referenced by QXlibKeyboard::changeLayout(), QXlibClipboard::clipboardReadIncrementalProperty(), QXlibClipboard::clipboardReadProperty(), QXlibWindow::createGC(), defaultVisual(), QXlibWindow::doSizeHints(), QXlibClipboardMime::empty(), QXlibWindowSurface::flush(), QXlibClipboardMime::formats_sys(), QXlibClipboard::getDataInFormat(), QXlibWindow::getMWMHints(), QXlibWindow::getNetWmState(), QXlibIntegration::hasOpenGL(), QTestLiteStaticInfoPrivate::initializeAllAtoms(), QTestLiteStaticInfoPrivate::initializeSupportedAtoms(), QXlibWindow::lower(), QXlibClipboard::owner(), physicalSize(), QGLXContext::QGLXContext(), QXlibScreen(), QXlibWindow::QXlibWindow(), QXlibWindow::raise(), QXlibWindow::requestActivateWindow(), QXlibClipboard::requestor(), QXlibWindowSurface::resizeShmImage(), QTestLiteStaticInfoPrivate::resolveXFixes(), QXlibWindow::setCursor(), QXlibWindow::setGeometry(), QXlibClipboard::setMimeData(), QXlibWindow::setMWMHints(), QXlibClipboard::setOwner(), QXlibWindow::setParent(), QXlibClipboard::setRequestor(), QXlibWindow::setVisible(), QXlibWindow::setWindowFlags(), QXlibWindow::setWindowTitle(), and QXlibWindow::~QXlibWindow().

{
    return mDisplay;
}

eventDispatcher

void QXlibScreen::eventDispatcher ( )

slot

Definition at line 395 of file qxlibscreen.cpp.

Referenced by physicalSize(), and QXlibScreen().

{
        ulong marker = XNextRequest(mDisplay->nativeDisplay());
    //    int i = 0;
        while (XPending(mDisplay->nativeDisplay())) {
            XEvent event;
            XNextEvent(mDisplay->nativeDisplay(), &event);
            /* done = */
            handleEvent(&event);

            if (event.xany.serial >= marker) {
    #ifdef MYX11_DEBUG
                qDebug() << "potential livelock averted";
    #endif
    #if 0
                if (XEventsQueued(mDisplay->nativeDisplay(), QueuedAfterFlush)) {
                    qDebug() << "   with events queued";
                    QTimer::singleShot(0, this, SLOT(eventDispatcher()));
                }
    #endif
                break;
            }
        }
}

format()

QImage::Format QXlibScreen::format ( ) const

inlinevirtual

Reimplement in subclass to return the image format which corresponds to the screen format.

Implements QPlatformScreen.

Definition at line 64 of file qxlibscreen.h.

{ return mFormat; }

geometry()

QRect QXlibScreen::geometry ( ) const

inlinevirtual

Reimplement in subclass to return the pixel geometry of the screen.

Implements QPlatformScreen.

Definition at line 62 of file qxlibscreen.h.

{ return mGeometry; }

grabWindow()

QImage QXlibScreen::grabWindow	(	Window	window,
		int	x,
		int	y,
		int	w,
		int	h
	)

Definition at line 420 of file qxlibscreen.cpp.

Referenced by QXlibIntegration::grabWindow(), and physicalSize().

{
    if (w == 0 || h ==0)
        return QImage();

    //WinId 0 means the desktop widget
    if (!window)
        window = rootWindow();

    XWindowAttributes window_attr;
    if (!XGetWindowAttributes(mDisplay->nativeDisplay(), window, &window_attr))
        return QImage();

    if (w < 0)
        w = window_attr.width - x;
    if (h < 0)
        h = window_attr.height - y;

    // Ideally, we should also limit ourselves to the screen area, but the Qt docs say
    // that it's "unsafe" to go outside the screen, so we can ignore that problem.

    //We're definitely not optimizing for speed...
    XImage *xi = XGetImage(mDisplay->nativeDisplay(), window, x, y, w, h, AllPlanes, ZPixmap);

    if (!xi)
        return QImage();

    //taking a copy to make sure we have ownership -- not fast
    QImage result = QImage( (uchar*) xi->data, xi->width, xi->height, xi->bytes_per_line, QImage::Format_RGB32 ).copy();

    XDestroyImage(xi);

    return result;
}

handleEvent()

bool QXlibScreen::handleEvent

(

XEvent *

xe

)

Definition at line 263 of file qxlibscreen.cpp.

Referenced by eventDispatcher(), physicalSize(), and waitForClipboardEvent().

{
    int quit = false;
    QXlibWindow *platformWindow = 0;
    QWidget *widget = QWidget::find(xe->xany.window);
    if (widget) {
        platformWindow = static_cast<QXlibWindow *>(widget->platformWindow());
    }

    Atom wmProtocolsAtom = QXlibStatic::atom(QXlibStatic::WM_PROTOCOLS);
    Atom wmDeleteWindowAtom = QXlibStatic::atom(QXlibStatic::WM_DELETE_WINDOW);
    switch (xe->type) {

    case ClientMessage:
        if (xe->xclient.format == 32 && xe->xclient.message_type == wmProtocolsAtom) {
            Atom a = xe->xclient.data.l[0];
            if (a == wmDeleteWindowAtom)
                platformWindow->handleCloseEvent();
        }
        break;

    case Expose:
        if (platformWindow)
            if (xe->xexpose.count == 0)
                platformWindow->paintEvent();
        break;
    case ConfigureNotify:
        if (platformWindow)
            platformWindow->resizeEvent(&xe->xconfigure);
        break;

    case ButtonPress:
        if (platformWindow)
            platformWindow->mousePressEvent(&xe->xbutton);
        break;

    case ButtonRelease:
        if (platformWindow)
            platformWindow->handleMouseEvent(QEvent::MouseButtonRelease, &xe->xbutton);
        break;

    case MotionNotify:
        if (platformWindow)
            platformWindow->handleMouseEvent(QEvent::MouseMove, &xe->xbutton);
        break;

        case XKeyPress:
        mKeyboard->handleKeyEvent(widget,QEvent::KeyPress, &xe->xkey);
        break;

    case XKeyRelease:
        mKeyboard->handleKeyEvent(widget,QEvent::KeyRelease, &xe->xkey);
        break;

    case EnterNotify:
        if (platformWindow)
            platformWindow->handleEnterEvent();
        break;

    case LeaveNotify:
        if (platformWindow)
            platformWindow->handleLeaveEvent();
        break;

    case XFocusIn:
        if (platformWindow)
            platformWindow->handleFocusInEvent();
        break;

    case XFocusOut:
        if (platformWindow)
            platformWindow->handleFocusOutEvent();
        break;

    case PropertyNotify:
        break;

    case SelectionClear:
        qDebug() << "Selection Clear!!!";
        break;
    case SelectionRequest:
        handleSelectionRequest(xe);
        break;
    case SelectionNotify:
        qDebug() << "Selection Notify!!!!";

        break;


    default:
#ifdef MYX11_DEBUG
        qDebug() << hex << xe->xany.window << "Other X event" << xe->type;
#endif
        break;
    }

    return quit;
}

handleSelectionRequest()

void QXlibScreen::handleSelectionRequest ( XEvent *  event )

private

Definition at line 481 of file qxlibscreen.cpp.

Referenced by handleEvent(), and physicalSize().

{
    QPlatformIntegration *integration = QApplicationPrivate::platformIntegration();
    QXlibClipboard *clipboard = static_cast<QXlibClipboard *>(integration->clipboard());
    clipboard->handleSelectionRequest(event);
}

keyboard()

QXlibKeyboard * QXlibScreen::keyboard

(

)

const

Definition at line 476 of file qxlibscreen.cpp.

Referenced by QXlibWindow::handleMouseEvent(), and physicalSize().

{
    return mKeyboard;
}

physicalSize()

QSize QXlibScreen::physicalSize ( ) const

inlinevirtual

Reimplement this function in subclass to return the physical size of the screen.

This function is used by QFont to convert point sizes to pixel sizes.

The default implementation takes the pixel size of the screen, considers a resolution of 100 dots per inch, and returns the calculated physical size. A device with a screen that has different resolutions will need to be supported by a suitable reimplementation of this function.

Reimplemented from QPlatformScreen.

Definition at line 65 of file qxlibscreen.h.

{ return mPhysicalSize; }

rootWindow()

Window QXlibScreen::rootWindow

(

)

Definition at line 241 of file qxlibscreen.cpp.

Referenced by QXlibCursor::createCursorBitmap(), QXlibIntegration::grabWindow(), grabWindow(), QTestLiteStaticInfoPrivate::initializeSupportedAtoms(), QXlibClipboard::owner(), physicalSize(), QXlibScreen(), QXlibWindow::QXlibWindow(), and QXlibClipboard::requestor().

{
    return RootWindow(mDisplay->nativeDisplay(), mScreen);
}

testLiteScreenForWidget()

QXlibScreen * QXlibScreen::testLiteScreenForWidget ( QWidget *  widget )

static

Definition at line 455 of file qxlibscreen.cpp.

Referenced by QXlibWindowSurface::flush(), QXlibIntegration::grabWindow(), physicalSize(), and QXlibWindowSurface::resizeShmImage().

{
    QPlatformScreen *platformScreen = platformScreenForWidget(widget);
    return static_cast<QXlibScreen *>(platformScreen);
}

waitForClipboardEvent()

bool QXlibScreen::waitForClipboardEvent	(	Window	win,
		int	type,
		XEvent *	event,
		int	timeout
	)

Definition at line 371 of file qxlibscreen.cpp.

Referenced by physicalSize().

{
    QElapsedTimer timer;
    timer.start();
    do {
        if (XCheckTypedWindowEvent(mDisplay->nativeDisplay(),win,type,event))
            return true;

        // process other clipboard events, since someone is probably requesting data from us
        XEvent e;
        if (XCheckIfEvent(mDisplay->nativeDisplay(), &e, checkForClipboardEvents, 0))
            handleEvent(&e);

        mDisplay->flush();

        // sleep 50 ms, so we don't use up CPU cycles all the time.
        struct timeval usleep_tv;
        usleep_tv.tv_sec = 0;
        usleep_tv.tv_usec = 50000;
        select(0, 0, 0, 0, &usleep_tv);
    } while (timer.elapsed() < timeout);
    return false;
}

whitePixel()

unsigned long QXlibScreen::whitePixel

(

)

Definition at line 251 of file qxlibscreen.cpp.

Referenced by QXlibClipboard::owner(), physicalSize(), QXlibWindow::QXlibWindow(), and QXlibClipboard::requestor().

{
    return WhitePixel(mDisplay->nativeDisplay(), mScreen);
}

xScreenNumber()

int QXlibScreen::xScreenNumber

(

)

const

Definition at line 466 of file qxlibscreen.cpp.

Referenced by defaultVisual(), physicalSize(), QGLXContext::QGLXContext(), and QXlibWindow::QXlibWindow().

{
    return mScreen;
}

Properties

mCursor

QXlibCursor* QXlibScreen::mCursor

private

Definition at line 100 of file qxlibscreen.h.

Referenced by QXlibScreen(), and ~QXlibScreen().

mDepth

int QXlibScreen::mDepth

private

Definition at line 98 of file qxlibscreen.h.

Referenced by depth(), and QXlibScreen().

mDisplay

QXlibDisplay* QXlibScreen::mDisplay

private

Definition at line 103 of file qxlibscreen.h.

Referenced by blackPixel(), display(), eventDispatcher(), grabWindow(), QXlibScreen(), rootWindow(), waitForClipboardEvent(), whitePixel(), and ~QXlibScreen().

mFormat

QImage::Format QXlibScreen::mFormat

private

Definition at line 99 of file qxlibscreen.h.

Referenced by format().

mGeometry

QRect QXlibScreen::mGeometry

private

Definition at line 96 of file qxlibscreen.h.

Referenced by geometry(), and QXlibScreen().

mKeyboard

QXlibKeyboard* QXlibScreen::mKeyboard

private

Definition at line 101 of file qxlibscreen.h.

Referenced by handleEvent(), keyboard(), and QXlibScreen().

mPhysicalSize

QSize QXlibScreen::mPhysicalSize

private

Definition at line 97 of file qxlibscreen.h.

Referenced by physicalSize(), and QXlibScreen().

mScreen

int QXlibScreen::mScreen

private

Definition at line 107 of file qxlibscreen.h.

Referenced by blackPixel(), QXlibScreen(), rootWindow(), whitePixel(), and xScreenNumber().

---

The documentation for this class was generated from the following files:

• /src/plugins/platforms/xlib/qxlibscreen.h
• /src/plugins/platforms/xlib/qxlibscreen.cpp