Long live Qt 4.5!

1 files changed, 380 insertions, 0 deletions

diff --git a/src/gui/kernel/qdesktopwidget_x11.cpp b/src/gui/kernel/qdesktopwidget_x11.cpp
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+++ b/src/gui/kernel/qdesktopwidget_x11.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, 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 1.0, 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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 = (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 ((d->screenCount == 1 || !isVirtualDesktop())
+        && X11->isSupportedByWM(ATOM(_NET_WORKAREA))) {
+        Atom ret;
+        int format, e;
+        unsigned char *data = 0;
+        unsigned long nitems, after;
+
+        e = XGetWindowProperty(X11->display,
+                                QX11Info::appRootWindow(screen),
+                                ATOM(_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
+{
+    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);
+    d->init();
+    qt_desktopwidget_workarea_dirty = true;
+    QWidget::resizeEvent(event);
+}
+
+QT_END_NAMESPACE