Windows-4.7.4/src/gui/kernel/qdesktopwidget_x11.cpp - platform/external/qt - Git at Google

 /****************************************************************************
 **
 ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** This file is part of the QtGui module of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:LGPL$
 ** GNU Lesser General Public License Usage
 ** This file may be used under the terms of the GNU Lesser General Public
 ** License version 2.1 as published by the Free Software Foundation and
 ** appearing in the file LICENSE.LGPL included in the packaging of this
 ** file. Please review the following information to ensure the GNU Lesser
 ** General Public License version 2.1 requirements will be met:
 ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
 **
 ** In addition, as a special exception, Nokia gives you certain additional
 ** rights. These rights are described in the Nokia Qt LGPL Exception
 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
 **
 ** GNU General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU General
 ** Public License version 3.0 as published by the Free Software Foundation
 ** and appearing in the file LICENSE.GPL included in the packaging of this
 ** file. Please review the following information to ensure the GNU General
 ** Public License version 3.0 requirements will be met:
 ** http://www.gnu.org/copyleft/gpl.html.
 **
 ** Other Usage
 ** Alternatively, this file may be used in accordance with the terms and
 ** conditions contained in a signed written agreement between you and Nokia.
 **
 **
 **
 **
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include "qapplication.h"
 #include "qdesktopwidget.h"
 #include "qlibrary.h"
 #include "qt_x11_p.h"
 #include "qvariant.h"
 #include "qwidget_p.h"
 #include "qx11info_x11.h"
 #include <limits.h>

 QT_BEGIN_NAMESPACE

 // defined in qwidget_x11.cpp
 extern int qt_x11_create_desktop_on_screen;


 // function to update the workarea of the screen
 static bool qt_desktopwidget_workarea_dirty = true;
 void qt_desktopwidget_update_workarea()
 {
     qt_desktopwidget_workarea_dirty = true;
 }


 class QSingleDesktopWidget : public QWidget
 {
 public:
     QSingleDesktopWidget();
     ~QSingleDesktopWidget();
 };

 QSingleDesktopWidget::QSingleDesktopWidget()
     : QWidget(0, Qt::Desktop)
 {
 }

 QSingleDesktopWidget::~QSingleDesktopWidget()
 {
     const QObjectList &childList = children();
     for (int i = childList.size(); i > 0 ;) {
         --i;
         childList.at(i)->setParent(0);
     }
 }


 class QDesktopWidgetPrivate : public QWidgetPrivate
 {
 public:
     QDesktopWidgetPrivate();
     ~QDesktopWidgetPrivate();

     void init();

     bool use_xinerama;
     int defaultScreen;
     int screenCount;

     QWidget **screens;
     QRect *rects;
     QRect *workareas;
 };

 QDesktopWidgetPrivate::QDesktopWidgetPrivate()
     : use_xinerama(false), defaultScreen(0), screenCount(1),
       screens(0), rects(0), workareas(0)
 {
 }

 QDesktopWidgetPrivate::~QDesktopWidgetPrivate()
 {
     if (screens) {
         for (int i = 0; i < screenCount; ++i) {
             if (i == defaultScreen) continue;
             delete screens[i];
             screens[i] = 0;
         }

         free (screens);
     }

     if (rects)     delete [] rects;
     if (workareas) delete [] workareas;
 }

 void QDesktopWidgetPrivate::init()
 {
     // get the screen count
     int newScreenCount = ScreenCount(X11->display);
 #ifndef QT_NO_XINERAMA

     XineramaScreenInfo *xinerama_screeninfo = 0;

     // we ignore the Xinerama extension when using the display is
     // using traditional multi-screen (with multiple root windows)
     if (newScreenCount == 1
         && X11->ptrXineramaQueryExtension
         && X11->ptrXineramaIsActive
         && X11->ptrXineramaQueryScreens) {
         int unused;
         use_xinerama = (X11->ptrXineramaQueryExtension(X11->display, &unused, &unused)
                         && X11->ptrXineramaIsActive(X11->display));
     }

     if (use_xinerama) {
         xinerama_screeninfo =
             X11->ptrXineramaQueryScreens(X11->display, &newScreenCount);
     }

     if (xinerama_screeninfo) {
         defaultScreen = 0;
      } else
 #endif // QT_NO_XINERAMA
     {
         defaultScreen = DefaultScreen(X11->display);
         newScreenCount = ScreenCount(X11->display);
         use_xinerama = false;
     }

     delete [] rects;
     rects     = new QRect[newScreenCount];
     delete [] workareas;
     workareas = new QRect[newScreenCount];

     // get the geometry of each screen
     int i, j, x, y, w, h;
     for (i = 0, j = 0; i < newScreenCount; i++, j++) {

 #ifndef QT_NO_XINERAMA
         if (use_xinerama) {
             x = xinerama_screeninfo[i].x_org;
             y = xinerama_screeninfo[i].y_org;
             w = xinerama_screeninfo[i].width;
             h = xinerama_screeninfo[i].height;
         } else
 #endif // QT_NO_XINERAMA
             {
                 x = 0;
                 y = 0;
                 w = WidthOfScreen(ScreenOfDisplay(X11->display, i));
                 h = HeightOfScreen(ScreenOfDisplay(X11->display, i));
             }

         rects[j].setRect(x, y, w, h);

         if (use_xinerama && j > 0 && rects[j-1].intersects(rects[j])) {
             // merge a "cloned" screen with the previous, hiding all crtcs
             // that are currently showing a sub-rect of the previous screen
             if ((rects[j].width()*rects[j].height()) >
                 (rects[j-1].width()*rects[j-1].height()))
                 rects[j-1] = rects[j];
             j--;
         }

         workareas[i] = QRect();
     }

     if (screens) {
         // leaks QWidget* pointers on purpose, can't delete them as pointer escapes
         screens = q_check_ptr((QWidget**) realloc(screens, j * sizeof(QWidget*)));
         if (j > screenCount)
             memset(&screens[screenCount], 0, (j-screenCount) * sizeof(QWidget*));
     }

     screenCount = j;

 #ifndef QT_NO_XINERAMA
     if (use_xinerama && screenCount == 1)
         use_xinerama = false;

     if (xinerama_screeninfo)
         XFree(xinerama_screeninfo);
 #endif // QT_NO_XINERAMA

 }

 // the QDesktopWidget itself will be created on the default screen
 // as qt_x11_create_desktop_on_screen defaults to -1
 QDesktopWidget::QDesktopWidget()
     : QWidget(*new QDesktopWidgetPrivate, 0, Qt::Desktop)
 {
     Q_D(QDesktopWidget);
     d->init();
 }

 QDesktopWidget::~QDesktopWidget()
 {
 }

 bool QDesktopWidget::isVirtualDesktop() const
 {
     Q_D(const QDesktopWidget);
     return d->use_xinerama;
 }

 int QDesktopWidget::primaryScreen() const
 {
     Q_D(const QDesktopWidget);
     return d->defaultScreen;
 }

 int QDesktopWidget::numScreens() const
 {
     Q_D(const QDesktopWidget);
     return d->screenCount;
 }

 QWidget *QDesktopWidget::screen(int screen)
 {
     Q_D(QDesktopWidget);
     if (d->use_xinerama)
         return this;

     if (screen < 0 || screen >= d->screenCount)
         screen = d->defaultScreen;

     if (! d->screens) {
         d->screens = (QWidget**) calloc( d->screenCount, sizeof(QWidget*));
         d->screens[d->defaultScreen] = this;
     }

     if (! d->screens[screen] ||               // not created yet
         ! (d->screens[screen]->windowType() == Qt::Desktop)) { // reparented away
         qt_x11_create_desktop_on_screen = screen;
         d->screens[screen] = new QSingleDesktopWidget;
         qt_x11_create_desktop_on_screen = -1;
     }

     return d->screens[screen];
 }

 const QRect QDesktopWidget::availableGeometry(int screen) const
 {
     Q_D(const QDesktopWidget);
     if (qt_desktopwidget_workarea_dirty) {
         // the workareas are dirty, invalidate them
         for (int i = 0; i < d->screenCount; ++i)
             d->workareas[i] = QRect();
         qt_desktopwidget_workarea_dirty = false;
     }

     if (screen < 0 || screen >= d->screenCount)
         screen = d->defaultScreen;

     if (d->workareas[screen].isValid())
         return d->workareas[screen];

     if (X11->isSupportedByWM(ATOM(_NET_WORKAREA))) {
         int x11Screen = isVirtualDesktop() ? DefaultScreen(X11->display) : screen;

         Atom ret;
         int format, e;
         unsigned char *data = 0;
         unsigned long nitems, after;

         e = XGetWindowProperty(X11->display,
                                QX11Info::appRootWindow(x11Screen),
                                ATOM(_NET_WORKAREA), 0, 4, False, XA_CARDINAL,
                                &ret, &format, &nitems, &after, &data);

         QRect workArea;
         if (e == Success && ret == XA_CARDINAL &&
             format == 32 && nitems == 4) {
             long *workarea = (long *) data;
             workArea = QRect(workarea[0], workarea[1], workarea[2], workarea[3]);
         } else {
             workArea = screenGeometry(screen);
         }

         if (isVirtualDesktop()) {
             // intersect the workarea (which spawns all Xinerama screens) with the rect for the
             // requested screen
             workArea &= screenGeometry(screen);
         }

         d->workareas[screen] = workArea;

         if (data)
             XFree(data);
     } else {
         d->workareas[screen] = screenGeometry(screen);
     }

     return d->workareas[screen];
 }

 const QRect QDesktopWidget::screenGeometry(int screen) const
 {
     Q_D(const QDesktopWidget);
     if (screen < 0 || screen >= d->screenCount)
         screen = d->defaultScreen;

     return d->rects[screen];
 }

 int QDesktopWidget::screenNumber(const QWidget *widget) const
 {
     Q_D(const QDesktopWidget);
     if (!widget)
         return d->defaultScreen;

 #ifndef QT_NO_XINERAMA
     if (d->use_xinerama) {
         // this is how we do it for xinerama
         QRect frame = widget->frameGeometry();
         if (!widget->isWindow())
             frame.moveTopLeft(widget->mapToGlobal(QPoint(0, 0)));

         int maxSize = -1;
         int maxScreen = -1;

         for (int i = 0; i < d->screenCount; ++i) {
             QRect sect = d->rects[i].intersected(frame);
             int size = sect.width() * sect.height();
             if (size > maxSize && sect.width() > 0 && sect.height() > 0) {
                 maxSize = size;
                 maxScreen = i;
             }
         }
         return maxScreen;
     }
 #endif // QT_NO_XINERAMA

     return widget->x11Info().screen();
 }

 int QDesktopWidget::screenNumber(const QPoint &point) const
 {
     Q_D(const QDesktopWidget);
     int closestScreen = -1;
     int shortestDistance = INT_MAX;
     for (int i = 0; i < d->screenCount; ++i) {
         int thisDistance = d->pointToRect(point, d->rects[i]);
         if (thisDistance < shortestDistance) {
             shortestDistance = thisDistance;
             closestScreen = i;
         }
     }
     return closestScreen;
 }

 void QDesktopWidget::resizeEvent(QResizeEvent *event)
 {
     Q_D(QDesktopWidget);
     int oldScreenCount = d->screenCount;
     QVector<QRect> oldRects(oldScreenCount);
     for (int i = 0; i < oldScreenCount; ++i) {
         oldRects[i] = d->rects[i];
     }

     d->init();

     for (int i = 0; i < qMin(oldScreenCount, d->screenCount); ++i) {
         if (oldRects.at(i) != d->rects[i])
             emit resized(i);
     }

     if (oldScreenCount != d->screenCount) {
         emit screenCountChanged(d->screenCount);
     }

     qt_desktopwidget_workarea_dirty = true;
     QWidget::resizeEvent(event);
 }

 QT_END_NAMESPACE
	/****************************************************************************
	**
	** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
	** All rights reserved.
	** Contact: Nokia Corporation (qt-info@nokia.com)
	**
	** This file is part of the QtGui module of the Qt Toolkit.
	**
	** $QT_BEGIN_LICENSE:LGPL$
	** GNU Lesser General Public License Usage
	** This file may be used under the terms of the GNU Lesser General Public
	** License version 2.1 as published by the Free Software Foundation and
	** appearing in the file LICENSE.LGPL included in the packaging of this
	** file. Please review the following information to ensure the GNU Lesser
	** General Public License version 2.1 requirements will be met:
	** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
	**
	** In addition, as a special exception, Nokia gives you certain additional
	** rights. These rights are described in the Nokia Qt LGPL Exception
	** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
	**
	** GNU General Public License Usage
	** Alternatively, this file may be used under the terms of the GNU General
	** Public License version 3.0 as published by the Free Software Foundation
	** and appearing in the file LICENSE.GPL included in the packaging of this
	** file. Please review the following information to ensure the GNU General
	** Public License version 3.0 requirements will be met:
	** http://www.gnu.org/copyleft/gpl.html.
	**
	** Other Usage
	** Alternatively, this file may be used in accordance with the terms and
	** conditions contained in a signed written agreement between you and Nokia.
	**
	**
	**
	**
	**
	** $QT_END_LICENSE$
	**
	****************************************************************************/

	#include "qapplication.h"
	#include "qdesktopwidget.h"
	#include "qlibrary.h"
	#include "qt_x11_p.h"
	#include "qvariant.h"
	#include "qwidget_p.h"
	#include "qx11info_x11.h"
	#include <limits.h>

	QT_BEGIN_NAMESPACE

	// defined in qwidget_x11.cpp
	extern int qt_x11_create_desktop_on_screen;


	// function to update the workarea of the screen
	static bool qt_desktopwidget_workarea_dirty = true;
	void qt_desktopwidget_update_workarea()
	{
	qt_desktopwidget_workarea_dirty = true;
	}


	class QSingleDesktopWidget : public QWidget
	{
	public:
	QSingleDesktopWidget();
	~QSingleDesktopWidget();
	};

	QSingleDesktopWidget::QSingleDesktopWidget()
	: QWidget(0, Qt::Desktop)
	{
	}

	QSingleDesktopWidget::~QSingleDesktopWidget()
	{
	const QObjectList &childList = children();
	for (int i = childList.size(); i > 0 ;) {
	--i;
	childList.at(i)->setParent(0);
	}
	}


	class QDesktopWidgetPrivate : public QWidgetPrivate
	{
	public:
	QDesktopWidgetPrivate();
	~QDesktopWidgetPrivate();

	void init();

	bool use_xinerama;
	int defaultScreen;
	int screenCount;

	QWidget **screens;
	QRect *rects;
	QRect *workareas;
	};

	QDesktopWidgetPrivate::QDesktopWidgetPrivate()
	: use_xinerama(false), defaultScreen(0), screenCount(1),
	screens(0), rects(0), workareas(0)
	{
	}

	QDesktopWidgetPrivate::~QDesktopWidgetPrivate()
	{
	if (screens) {
	for (int i = 0; i < screenCount; ++i) {
	if (i == defaultScreen) continue;
	delete screens[i];
	screens[i] = 0;
	}

	free (screens);
	}

	if (rects) delete [] rects;
	if (workareas) delete [] workareas;
	}

	void QDesktopWidgetPrivate::init()
	{
	// get the screen count
	int newScreenCount = ScreenCount(X11->display);
	#ifndef QT_NO_XINERAMA

	XineramaScreenInfo *xinerama_screeninfo = 0;

	// we ignore the Xinerama extension when using the display is
	// using traditional multi-screen (with multiple root windows)
	if (newScreenCount == 1
	&& X11->ptrXineramaQueryExtension
	&& X11->ptrXineramaIsActive
	&& X11->ptrXineramaQueryScreens) {
	int unused;
	use_xinerama = (X11->ptrXineramaQueryExtension(X11->display, &unused, &unused)
	&& X11->ptrXineramaIsActive(X11->display));
	}

	if (use_xinerama) {
	xinerama_screeninfo =
	X11->ptrXineramaQueryScreens(X11->display, &newScreenCount);
	}

	if (xinerama_screeninfo) {
	defaultScreen = 0;
	} else
	#endif // QT_NO_XINERAMA
	{
	defaultScreen = DefaultScreen(X11->display);
	newScreenCount = ScreenCount(X11->display);
	use_xinerama = false;
	}

	delete [] rects;
	rects = new QRect[newScreenCount];
	delete [] workareas;
	workareas = new QRect[newScreenCount];

	// get the geometry of each screen
	int i, j, x, y, w, h;
	for (i = 0, j = 0; i < newScreenCount; i++, j++) {

	#ifndef QT_NO_XINERAMA
	if (use_xinerama) {
	x = xinerama_screeninfo[i].x_org;
	y = xinerama_screeninfo[i].y_org;
	w = xinerama_screeninfo[i].width;
	h = xinerama_screeninfo[i].height;
	} else
	#endif // QT_NO_XINERAMA
	{
	x = 0;
	y = 0;
	w = WidthOfScreen(ScreenOfDisplay(X11->display, i));
	h = HeightOfScreen(ScreenOfDisplay(X11->display, i));
	}

	rects[j].setRect(x, y, w, h);

	if (use_xinerama && j > 0 && rects[j-1].intersects(rects[j])) {
	// merge a "cloned" screen with the previous, hiding all crtcs
	// that are currently showing a sub-rect of the previous screen
	if ((rects[j].width()*rects[j].height()) >
	(rects[j-1].width()*rects[j-1].height()))
	rects[j-1] = rects[j];
	j--;
	}

	workareas[i] = QRect();
	}

	if (screens) {
	// leaks QWidget* pointers on purpose, can't delete them as pointer escapes
	screens = q_check_ptr((QWidget*) realloc(screens, j sizeof(QWidget*)));
	if (j > screenCount)
	memset(&screens[screenCount], 0, (j-screenCount) * sizeof(QWidget*));
	}

	screenCount = j;

	#ifndef QT_NO_XINERAMA
	if (use_xinerama && screenCount == 1)
	use_xinerama = false;

	if (xinerama_screeninfo)
	XFree(xinerama_screeninfo);
	#endif // QT_NO_XINERAMA

	}

	// the QDesktopWidget itself will be created on the default screen
	// as qt_x11_create_desktop_on_screen defaults to -1
	QDesktopWidget::QDesktopWidget()
	: QWidget(*new QDesktopWidgetPrivate, 0, Qt::Desktop)
	{
	Q_D(QDesktopWidget);
	d->init();
	}

	QDesktopWidget::~QDesktopWidget()
	{
	}

	bool QDesktopWidget::isVirtualDesktop() const
	{
	Q_D(const QDesktopWidget);
	return d->use_xinerama;
	}

	int QDesktopWidget::primaryScreen() const
	{
	Q_D(const QDesktopWidget);
	return d->defaultScreen;
	}

	int QDesktopWidget::numScreens() const
	{
	Q_D(const QDesktopWidget);
	return d->screenCount;
	}

	QWidget *QDesktopWidget::screen(int screen)
	{
	Q_D(QDesktopWidget);
	if (d->use_xinerama)
	return this;

	if (screen < 0 \|\| screen >= d->screenCount)
	screen = d->defaultScreen;

	if (! d->screens) {
	d->screens = (QWidget*) calloc( d->screenCount, sizeof(QWidget));
	d->screens[d->defaultScreen] = this;
	}

	if (! d->screens[screen] \|\| // not created yet
	! (d->screens[screen]->windowType() == Qt::Desktop)) { // reparented away
	qt_x11_create_desktop_on_screen = screen;
	d->screens[screen] = new QSingleDesktopWidget;
	qt_x11_create_desktop_on_screen = -1;
	}

	return d->screens[screen];
	}

	const QRect QDesktopWidget::availableGeometry(int screen) const
	{
	Q_D(const QDesktopWidget);
	if (qt_desktopwidget_workarea_dirty) {
	// the workareas are dirty, invalidate them
	for (int i = 0; i < d->screenCount; ++i)
	d->workareas[i] = QRect();
	qt_desktopwidget_workarea_dirty = false;
	}

	if (screen < 0 \|\| screen >= d->screenCount)
	screen = d->defaultScreen;

	if (d->workareas[screen].isValid())
	return d->workareas[screen];

	if (X11->isSupportedByWM(ATOM(_NET_WORKAREA))) {
	int x11Screen = isVirtualDesktop() ? DefaultScreen(X11->display) : screen;

	Atom ret;
	int format, e;
	unsigned char *data = 0;
	unsigned long nitems, after;

	e = XGetWindowProperty(X11->display,
	QX11Info::appRootWindow(x11Screen),
	ATOM(_NET_WORKAREA), 0, 4, False, XA_CARDINAL,
	&ret, &format, &nitems, &after, &data);

	QRect workArea;
	if (e == Success && ret == XA_CARDINAL &&
	format == 32 && nitems == 4) {
	long workarea = (long ) data;
	workArea = QRect(workarea[0], workarea[1], workarea[2], workarea[3]);
	} else {
	workArea = screenGeometry(screen);
	}

	if (isVirtualDesktop()) {
	// intersect the workarea (which spawns all Xinerama screens) with the rect for the
	// requested screen
	workArea &= screenGeometry(screen);
	}

	d->workareas[screen] = workArea;

	if (data)
	XFree(data);
	} else {
	d->workareas[screen] = screenGeometry(screen);
	}

	return d->workareas[screen];
	}

	const QRect QDesktopWidget::screenGeometry(int screen) const
	{
	Q_D(const QDesktopWidget);
	if (screen < 0 \|\| screen >= d->screenCount)
	screen = d->defaultScreen;

	return d->rects[screen];
	}

	int QDesktopWidget::screenNumber(const QWidget *widget) const
	{
	Q_D(const QDesktopWidget);
	if (!widget)
	return d->defaultScreen;

	#ifndef QT_NO_XINERAMA
	if (d->use_xinerama) {
	// this is how we do it for xinerama
	QRect frame = widget->frameGeometry();
	if (!widget->isWindow())
	frame.moveTopLeft(widget->mapToGlobal(QPoint(0, 0)));

	int maxSize = -1;
	int maxScreen = -1;

	for (int i = 0; i < d->screenCount; ++i) {
	QRect sect = d->rects[i].intersected(frame);
	int size = sect.width() * sect.height();
	if (size > maxSize && sect.width() > 0 && sect.height() > 0) {
	maxSize = size;
	maxScreen = i;
	}
	}
	return maxScreen;
	}
	#endif // QT_NO_XINERAMA

	return widget->x11Info().screen();
	}

	int QDesktopWidget::screenNumber(const QPoint &point) const
	{
	Q_D(const QDesktopWidget);
	int closestScreen = -1;
	int shortestDistance = INT_MAX;
	for (int i = 0; i < d->screenCount; ++i) {
	int thisDistance = d->pointToRect(point, d->rects[i]);
	if (thisDistance < shortestDistance) {
	shortestDistance = thisDistance;
	closestScreen = i;
	}
	}
	return closestScreen;
	}

	void QDesktopWidget::resizeEvent(QResizeEvent *event)
	{
	Q_D(QDesktopWidget);
	int oldScreenCount = d->screenCount;
	QVector<QRect> oldRects(oldScreenCount);
	for (int i = 0; i < oldScreenCount; ++i) {
	oldRects[i] = d->rects[i];
	}

	d->init();

	for (int i = 0; i < qMin(oldScreenCount, d->screenCount); ++i) {
	if (oldRects.at(i) != d->rects[i])
	emit resized(i);
	}

	if (oldScreenCount != d->screenCount) {
	emit screenCountChanged(d->screenCount);
	}

	qt_desktopwidget_workarea_dirty = true;
	QWidget::resizeEvent(event);
	}

	QT_END_NAMESPACE