/**************************************************************************** ** ** Implementation of QDesktopWidget class. ** ** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved. ** ** This file is part of the kernel module of the Qt GUI Toolkit. ** ** This file may be used under the terms of the GNU General ** Public License versions 2.0 or 3.0 as published by the Free ** Software Foundation and appearing in the files LICENSE.GPL2 ** and LICENSE.GPL3 included in the packaging of this file. ** Alternatively you may (at your option) use any later version ** of the GNU General Public License if such license has been ** publicly approved by Trolltech ASA (or its successors, if any) ** and the KDE Free Qt Foundation. ** ** Please review the following information to ensure GNU General ** Public Licensing requirements will be met: ** http://trolltech.com/products/qt/licenses/licensing/opensource/. ** If you are unsure which license is appropriate for your use, please ** review the following information: ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview ** or contact the sales department at sales@trolltech.com. ** ** This file may be used under the terms of the Q Public License as ** defined by Trolltech ASA and appearing in the file LICENSE.QPL ** included in the packaging of this file. Licensees holding valid Qt ** Commercial licenses may use this file in accordance with the Qt ** Commercial License Agreement provided with the Software. ** ** This file is provided "AS IS" with NO WARRANTY OF ANY KIND, ** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted ** herein. ** **********************************************************************/ #include "qdesktopwidget.h" #include "qapplication.h" #include "qobjectlist.h" #include "qt_x11_p.h" #include <cstdlib> // defined in qwidget_x11.cpp extern int qt_x11_create_desktop_on_screen; // defined in qapplication_x11.cpp extern Atom qt_net_workarea; extern bool qt_net_supports(Atom atom); // 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, "desktop", WType_Desktop ) { } QSingleDesktopWidget::~QSingleDesktopWidget() { while ( children() ) removeChild( children()->getFirst() ); } class QDesktopWidgetPrivate { 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; #ifndef QT_NO_XINERAMA XineramaScreenInfo *xinerama_screeninfo = 0; int unused; use_xinerama = (XineramaQueryExtension(QPaintDevice::x11AppDisplay(), &unused, &unused) && XineramaIsActive(QPaintDevice::x11AppDisplay())); if (use_xinerama) { xinerama_screeninfo = XineramaQueryScreens(QPaintDevice::x11AppDisplay(), &newScreenCount); if (xinerama_screeninfo) defaultScreen = 0; } else #endif // QT_NO_XINERAMA { defaultScreen = DefaultScreen(QPaintDevice::x11AppDisplay()); newScreenCount = ScreenCount(QPaintDevice::x11AppDisplay()); 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++ ) { #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(QPaintDevice::x11AppDisplay(), i)); h = HeightOfScreen(ScreenOfDisplay(QPaintDevice::x11AppDisplay(), i)); } workareas[i] = QRect(); rects[j].setRect(x, y, w, h); // overlapping? if (j > 0 && rects[j-1].intersects(rects[j])) { // pick the bigger one, ignore the other if ((rects[j].width()*rects[j].height()) > (rects[j-1].width()*rects[j-1].height())) rects[j-1] = rects[j]; } else j++; } if (screens) { // leaks QWidget* pointers on purpose, can't delete them as pointer escapes screens = (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( 0, "desktop", WType_Desktop ) { d = new QDesktopWidgetPrivate(); /* we don't call d->init() here, since the initial resize event will end up calling init() a second time, which is inefficient. instead, for the sending of all posted event to the desktop widget (including the initial resize event, which calls d->init()). */ QApplication::sendPostedEvents( this, 0 ); } QDesktopWidget::~QDesktopWidget() { delete d; } bool QDesktopWidget::isVirtualDesktop() const { return d->use_xinerama; } int QDesktopWidget::primaryScreen() const { return d->defaultScreen; } int QDesktopWidget::numScreens() const { return d->screenCount; } QWidget *QDesktopWidget::screen( int screen ) { 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]->isDesktop() ) { // 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 { 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 ( ! isVirtualDesktop() && qt_net_supports( qt_net_workarea ) ) { Atom ret; int format, e; unsigned char *data = 0; unsigned long nitems, after; e = XGetWindowProperty( QPaintDevice::x11AppDisplay(), QPaintDevice::x11AppRootWindow( screen ), qt_net_workarea, 0, 4, False, XA_CARDINAL, &ret, &format, &nitems, &after, &data ); if (e == Success && ret == XA_CARDINAL && format == 32 && nitems == 4) { long *workarea = (long *) data; d->workareas[screen].setRect( workarea[0], workarea[1], workarea[2], workarea[3] ); } else { d->workareas[screen] = screenGeometry(screen); } if ( data ) XFree( data ); } else { d->workareas[screen] = screenGeometry(screen); } return d->workareas[screen]; } const QRect& QDesktopWidget::screenGeometry( int screen ) const { if ( screen < 0 || screen >= d->screenCount ) screen = d->defaultScreen; return d->rects[ screen ]; } int QDesktopWidget::screenNumber( QWidget *widget ) const { 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->isTopLevel() ) 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].intersect( 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->x11Screen(); } int QDesktopWidget::screenNumber( const QPoint &point ) const { for ( int i = 0; i < d->screenCount; ++i ) { if ( d->rects[i].contains( point ) ) return i; } return -1; } void QDesktopWidget::resizeEvent( QResizeEvent *event ) { d->init(); qt_desktopwidget_workarea_dirty = TRUE; QWidget::resizeEvent( event ); }