| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the QtWidgets module of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:LGPL$ |
| ** Commercial License Usage |
| ** Licensees holding valid commercial Qt licenses may use this file in |
| ** accordance with the commercial license agreement provided with the |
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| ** |
| ** GNU Lesser General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU Lesser |
| ** General Public License version 3 as published by the Free Software |
| ** Foundation and appearing in the file LICENSE.LGPL3 included in the |
| ** packaging of this file. Please review the following information to |
| ** ensure the GNU Lesser General Public License version 3 requirements |
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| ** |
| ** GNU General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU |
| ** General Public License version 2.0 or (at your option) the GNU General |
| ** Public license version 3 or any later version approved by the KDE Free |
| ** Qt Foundation. The licenses are as published by the Free Software |
| ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 |
| ** included in the packaging of this file. Please review the following |
| ** information to ensure the GNU General Public License requirements will |
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| ** |
| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| #include "qglobal.h" |
| #include "qdesktopwidget.h" |
| #include "qdesktopwidget_p.h" |
| #include "qscreen.h" |
| #include "qwidget_p.h" |
| #include "qwindow.h" |
| |
| #include <private/qhighdpiscaling_p.h> |
| #include <qpa/qplatformscreen.h> |
| |
| QT_BEGIN_NAMESPACE |
| |
| QDesktopScreenWidget::QDesktopScreenWidget(QScreen *screen, const QRect &geometry) |
| : QWidget(nullptr, Qt::Desktop), m_screen(screen) |
| { |
| setVisible(false); |
| if (QWindow *winHandle = windowHandle()) |
| winHandle->setScreen(screen); |
| setScreenGeometry(geometry); |
| } |
| |
| void QDesktopScreenWidget::setScreenGeometry(const QRect &geometry) |
| { |
| m_geometry = geometry; |
| setGeometry(geometry); |
| } |
| |
| int QDesktopScreenWidget::screenNumber() const |
| { |
| const QDesktopWidgetPrivate *desktopWidgetP |
| = static_cast<const QDesktopWidgetPrivate *>(qt_widget_private(QApplication::desktop())); |
| return desktopWidgetP->screens.indexOf(const_cast<QDesktopScreenWidget *>(this)); |
| } |
| |
| const QRect QDesktopWidget::screenGeometry(const QWidget *widget) const |
| { |
| return QDesktopWidgetPrivate::screenGeometry(widget); |
| } |
| |
| const QRect QDesktopWidgetPrivate::screenGeometry(const QWidget *widget) |
| { |
| if (Q_UNLIKELY(!widget)) { |
| qWarning("QDesktopWidget::screenGeometry(): Attempt " |
| "to get the screen geometry of a null widget"); |
| return QRect(); |
| } |
| QRect rect = QWidgetPrivate::screenGeometry(widget); |
| if (rect.isNull()) |
| return screenGeometry(screenNumber(widget)); |
| else return rect; |
| } |
| |
| const QRect QDesktopWidget::availableGeometry(const QWidget *widget) const |
| { |
| return QDesktopWidgetPrivate::availableGeometry(widget); |
| } |
| |
| const QRect QDesktopWidgetPrivate::availableGeometry(const QWidget *widget) |
| { |
| if (Q_UNLIKELY(!widget)) { |
| qWarning("QDesktopWidget::availableGeometry(): Attempt " |
| "to get the available geometry of a null widget"); |
| return QRect(); |
| } |
| QRect rect = QWidgetPrivate::screenGeometry(widget); |
| if (rect.isNull()) |
| return availableGeometry(screenNumber(widget)); |
| else |
| return rect; |
| } |
| |
| QDesktopScreenWidget *QDesktopWidgetPrivate::widgetForScreen(QScreen *qScreen) const |
| { |
| foreach (QDesktopScreenWidget *widget, screens) { |
| if (widget->assignedScreen() == qScreen) |
| return widget; |
| } |
| return nullptr; |
| } |
| |
| void QDesktopWidgetPrivate::_q_updateScreens() |
| { |
| Q_Q(QDesktopWidget); |
| const QList<QScreen *> screenList = QGuiApplication::screens(); |
| const int targetLength = screenList.length(); |
| bool screenCountChanged = false; |
| |
| // Re-build our screens list. This is the easiest way to later compute which signals to emit. |
| // Create new screen widgets as necessary. While iterating, keep the old list in place so |
| // that widgetForScreen works. |
| // Furthermore, we note which screens have changed, and compute the overall virtual geometry. |
| QList<QDesktopScreenWidget *> newScreens; |
| QList<int> changedScreens; |
| QRegion virtualGeometry; |
| |
| for (int i = 0; i < targetLength; ++i) { |
| QScreen *qScreen = screenList.at(i); |
| const QRect screenGeometry = qScreen->geometry(); |
| QDesktopScreenWidget *screenWidget = widgetForScreen(qScreen); |
| if (screenWidget) { |
| // an old screen. update geometry and remember the index in the *new* list |
| if (screenGeometry != screenWidget->screenGeometry()) { |
| screenWidget->setScreenGeometry(screenGeometry); |
| changedScreens.push_back(i); |
| } |
| } else { |
| // a new screen, create a widget and connect the signals. |
| screenWidget = new QDesktopScreenWidget(qScreen, screenGeometry); |
| QObject::connect(qScreen, SIGNAL(geometryChanged(QRect)), |
| q, SLOT(_q_updateScreens()), Qt::QueuedConnection); |
| QObject::connect(qScreen, SIGNAL(availableGeometryChanged(QRect)), |
| q, SLOT(_q_availableGeometryChanged()), Qt::QueuedConnection); |
| QObject::connect(qScreen, SIGNAL(destroyed()), |
| q, SLOT(_q_updateScreens()), Qt::QueuedConnection); |
| screenCountChanged = true; |
| } |
| // record all the screens and the overall geometry. |
| newScreens.push_back(screenWidget); |
| virtualGeometry += screenGeometry; |
| } |
| |
| // Now we apply the accumulated updates. |
| screens.swap(newScreens); // now [newScreens] is the old screen list |
| Q_ASSERT(screens.size() == targetLength); |
| q->setGeometry(virtualGeometry.boundingRect()); |
| |
| // Delete the QDesktopScreenWidget that are not used any more. |
| foreach (QDesktopScreenWidget *screen, newScreens) { |
| if (!screens.contains(screen)) { |
| delete screen; |
| screenCountChanged = true; |
| } |
| } |
| |
| // Finally, emit the signals. |
| if (screenCountChanged) { |
| // Notice that we trigger screenCountChanged even if a screen was removed and another one added, |
| // in which case the total number of screens did not change. This is the only way for applications |
| // to notice that a screen was swapped out against another one. |
| #if QT_DEPRECATED_SINCE(5, 11) |
| QT_WARNING_PUSH |
| QT_WARNING_DISABLE_DEPRECATED |
| emit q->screenCountChanged(targetLength); |
| QT_WARNING_POP |
| #endif |
| } |
| #if QT_DEPRECATED_SINCE(5, 11) |
| foreach (int changedScreen, changedScreens) |
| QT_WARNING_PUSH |
| QT_WARNING_DISABLE_DEPRECATED |
| emit q->resized(changedScreen); |
| QT_WARNING_POP |
| #endif |
| } |
| |
| void QDesktopWidgetPrivate::_q_availableGeometryChanged() |
| { |
| #if QT_DEPRECATED_SINCE(5, 11) |
| Q_Q(QDesktopWidget); |
| if (QScreen *screen = qobject_cast<QScreen *>(q->sender())) |
| QT_WARNING_PUSH |
| QT_WARNING_DISABLE_DEPRECATED |
| emit q->workAreaResized(QGuiApplication::screens().indexOf(screen)); |
| QT_WARNING_POP |
| #endif |
| } |
| |
| QDesktopWidget::QDesktopWidget() |
| : QWidget(*new QDesktopWidgetPrivate, 0, Qt::Desktop) |
| { |
| Q_D(QDesktopWidget); |
| setObjectName(QLatin1String("desktop")); |
| d->_q_updateScreens(); |
| connect(qApp, SIGNAL(screenAdded(QScreen*)), this, SLOT(_q_updateScreens())); |
| #if QT_DEPRECATED_SINCE(5, 11) |
| connect(qApp, SIGNAL(primaryScreenChanged(QScreen*)), this, SIGNAL(primaryScreenChanged())); |
| #endif |
| } |
| |
| QDesktopWidget::~QDesktopWidget() |
| { |
| } |
| |
| #if QT_DEPRECATED_SINCE(5, 11) |
| bool QDesktopWidget::isVirtualDesktop() const |
| { |
| return QDesktopWidgetPrivate::isVirtualDesktop(); |
| } |
| #endif |
| |
| bool QDesktopWidgetPrivate::isVirtualDesktop() |
| { |
| return QGuiApplication::primaryScreen()->virtualSiblings().size() > 1; |
| } |
| |
| QRect QDesktopWidgetPrivate::geometry() |
| { |
| return QGuiApplication::primaryScreen()->virtualGeometry(); |
| } |
| |
| QSize QDesktopWidgetPrivate::size() |
| { |
| return geometry().size(); |
| } |
| |
| int QDesktopWidgetPrivate::width() |
| { |
| return geometry().width(); |
| } |
| |
| int QDesktopWidgetPrivate::height() |
| { |
| return geometry().height(); |
| } |
| |
| #if QT_DEPRECATED_SINCE(5, 11) |
| int QDesktopWidget::primaryScreen() const |
| { |
| return QDesktopWidgetPrivate::primaryScreen(); |
| } |
| #endif |
| |
| int QDesktopWidgetPrivate::primaryScreen() |
| { |
| return 0; |
| } |
| |
| int QDesktopWidgetPrivate::numScreens() |
| { |
| return qMax(QGuiApplication::screens().size(), 1); |
| } |
| |
| #if QT_DEPRECATED_SINCE(5, 11) |
| int QDesktopWidget::numScreens() const |
| { |
| return QDesktopWidgetPrivate::numScreens(); |
| } |
| |
| QWidget *QDesktopWidget::screen(int screen) |
| { |
| Q_D(QDesktopWidget); |
| if (screen < 0 || screen >= d->screens.length()) |
| return d->screens.at(0); |
| return d->screens.at(screen); |
| } |
| |
| const QRect QDesktopWidget::availableGeometry(int screenNo) const |
| { |
| return QDesktopWidgetPrivate::availableGeometry(screenNo); |
| } |
| #endif |
| |
| const QRect QDesktopWidgetPrivate::availableGeometry(int screenNo) |
| { |
| const QScreen *screen = QDesktopWidgetPrivate::screen(screenNo); |
| return screen ? screen->availableGeometry() : QRect(); |
| } |
| |
| #if QT_DEPRECATED_SINCE(5, 11) |
| const QRect QDesktopWidget::screenGeometry(int screenNo) const |
| { |
| return QDesktopWidgetPrivate::screenGeometry(screenNo); |
| } |
| #endif |
| |
| const QRect QDesktopWidgetPrivate::screenGeometry(int screenNo) |
| { |
| const QScreen *screen = QDesktopWidgetPrivate::screen(screenNo); |
| return screen ? screen->geometry() : QRect(); |
| } |
| |
| int QDesktopWidget::screenNumber(const QWidget *w) const |
| { |
| return QDesktopWidgetPrivate::screenNumber(w); |
| } |
| |
| int QDesktopWidgetPrivate::screenNumber(const QWidget *w) |
| { |
| if (!w) |
| return primaryScreen(); |
| |
| const QList<QScreen *> allScreens = QGuiApplication::screens(); |
| QList<QScreen *> screens = allScreens; |
| if (screens.isEmpty()) // This should never happen |
| return primaryScreen(); |
| |
| // If there is more than one virtual desktop |
| if (screens.count() != screens.constFirst()->virtualSiblings().count()) { |
| // Find the root widget, get a QScreen from it and use the |
| // virtual siblings for checking the window position. |
| if (const QScreen *winScreen = qt_widget_private(const_cast<QWidget *>(w))->associatedScreen()) |
| screens = winScreen->virtualSiblings(); |
| } |
| |
| // Get the screen number from window position using screen geometry |
| // and proper screens. |
| QRect frame = w->frameGeometry(); |
| if (!w->isWindow()) |
| frame.moveTopLeft(w->mapToGlobal(QPoint(0, 0))); |
| |
| QScreen *widgetScreen = nullptr; |
| int largestArea = 0; |
| foreach (QScreen *screen, screens) { |
| const QRect deviceIndependentScreenGeometry = |
| QHighDpi::fromNativePixels(screen->handle()->geometry(), screen); |
| const QRect intersected = deviceIndependentScreenGeometry.intersected(frame); |
| int area = intersected.width() * intersected.height(); |
| if (largestArea < area) { |
| widgetScreen = screen; |
| largestArea = area; |
| } |
| } |
| return allScreens.indexOf(widgetScreen); |
| } |
| |
| #if QT_DEPRECATED_SINCE(5, 11) |
| int QDesktopWidget::screenNumber(const QPoint &p) const |
| { |
| return QDesktopWidgetPrivate::screenNumber(p); |
| } |
| #endif |
| |
| int QDesktopWidgetPrivate::screenNumber(const QPoint &p) |
| { |
| QScreen *screen = QGuiApplication::screenAt(p); |
| return screen ? QGuiApplication::screens().indexOf(screen) : primaryScreen(); |
| } |
| |
| QScreen *QDesktopWidgetPrivate::screen(int screenNo) |
| { |
| QList<QScreen *> screens = QGuiApplication::screens(); |
| if (screenNo == -1) |
| screenNo = 0; |
| if (screenNo < 0 || screenNo >= screens.size()) |
| return nullptr; |
| return screens.at(screenNo); |
| } |
| |
| void QDesktopWidget::resizeEvent(QResizeEvent *) |
| { |
| } |
| |
| QT_END_NAMESPACE |
| |
| #include "moc_qdesktopwidget.cpp" |
| #include "moc_qdesktopwidget_p.cpp" |