Prepare for deprecating the QDesktopWidget

QDesktopWidget is marked as obsolete in docs, but it is not yet
completely deprecated, some of its methods are still in use.

Replace uses of the following methods marked as obsolete:
- QDesktopWidget::screenNumber(QWidget*) -> QWidget::screen()
- QDesktopWidget::screenGeometry(QWidget*) -> QWidget::screen()->geometry()
- QDesktopWidget::availableGeometry(QWidget*) -> QWidget::screen()->availableGeometry()

Task-number: QTBUG-76491
Change-Id: I2cca30f2b4caa6e6848e8190e09f959d2c272f33
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

29 files changed, 60 insertions, 65 deletions

diff --git a/examples/corelib/mimetypes/mimetypebrowser/main.cpp b/examples/corelib/mimetypes/mimetypebrowser/main.cpp
index cf87004a01..679d97dc7b 100644
--- a/examples/corelib/mimetypes/mimetypebrowser/main.cpp
+++ b/examples/corelib/mimetypes/mimetypebrowser/main.cpp
@@ -51,7 +51,7 @@
 #include "mainwindow.h"
 
 #include <QApplication>
-#include <QDesktopWidget>
+#include <QScreen>
 
 #include <QCommandLineParser>
 #include <QCommandLineOption>
@@ -68,7 +68,7 @@ int main(int argc, char *argv[])
     parser.process(app);
 
     MainWindow mainWindow;
-    const QRect availableGeometry = QApplication::desktop()->availableGeometry(&mainWindow);
+    const QRect availableGeometry = mainWindow.screen()->availableGeometry();
     mainWindow.resize(availableGeometry.width() / 3, availableGeometry.height() / 2);
     mainWindow.show();
 
diff --git a/examples/network/http/main.cpp b/examples/network/http/main.cpp
index b7d254ff22..f126c7846a 100644
--- a/examples/network/http/main.cpp
+++ b/examples/network/http/main.cpp
@@ -49,8 +49,8 @@
 ****************************************************************************/
 
 #include <QApplication>
-#include <QDesktopWidget>
 #include <QDir>
+#include <QScreen>
 
 #include "httpwindow.h"
 
@@ -59,7 +59,7 @@ int main(int argc, char *argv[])
     QApplication app(argc, argv);
 
     HttpWindow httpWin;
-    const QRect availableSize = QApplication::desktop()->availableGeometry(&httpWin);
+    const QRect availableSize = httpWin.screen()->availableGeometry();
     httpWin.resize(availableSize.width() / 5, availableSize.height() / 5);
     httpWin.move((availableSize.width() - httpWin.width()) / 2, (availableSize.height() - httpWin.height()) / 2);
 
diff --git a/examples/opengl/threadedqopenglwidget/main.cpp b/examples/opengl/threadedqopenglwidget/main.cpp
index 983f608543..975def030b 100644
--- a/examples/opengl/threadedqopenglwidget/main.cpp
+++ b/examples/opengl/threadedqopenglwidget/main.cpp
@@ -50,7 +50,7 @@
 
 #include <QApplication>
 #include <QMainWindow>
-#include <QDesktopWidget>
+#include <QScreen>
 #include <QSurfaceFormat>
 #include <QOpenGLContext>
 #include <QCommandLineParser>
@@ -90,7 +90,7 @@ int main( int argc, char ** argv )
     // The rendering for the four QOpenGLWidgets happens on four separate threads.
 
     GLWidget topLevelGlWidget;
-    QPoint pos = QApplication::desktop()->availableGeometry(&topLevelGlWidget).topLeft() + QPoint(200, 200);
+    QPoint pos = topLevelGlWidget.screen()->availableGeometry().topLeft() + QPoint(200, 200);
     topLevelGlWidget.setWindowTitle(QStringLiteral("Threaded QOpenGLWidget example top level"));
     topLevelGlWidget.resize(200, 200);
     topLevelGlWidget.move(pos);
diff --git a/examples/widgets/desktop/screenshot/main.cpp b/examples/widgets/desktop/screenshot/main.cpp
index 825c40b236..96b0d57daa 100644
--- a/examples/widgets/desktop/screenshot/main.cpp
+++ b/examples/widgets/desktop/screenshot/main.cpp
@@ -49,7 +49,7 @@
 ****************************************************************************/
 
 #include <QApplication>
-#include <QDesktopWidget>
+#include <QScreen>
 
 #include "screenshot.h"
 
@@ -58,7 +58,8 @@ int main(int argc, char *argv[])
     QApplication app(argc, argv);
 
     Screenshot screenshot;
-    screenshot.move(QApplication::desktop()->availableGeometry(&screenshot).topLeft() + QPoint(20, 20));
+    screenshot.move(screenshot.screen()->availableGeometry().topLeft() + QPoint(20, 20));
     screenshot.show();
+
     return app.exec();
 }
diff --git a/examples/widgets/desktop/screenshot/screenshot.cpp b/examples/widgets/desktop/screenshot/screenshot.cpp
index 715e6c780e..ce5597bbdd 100644
--- a/examples/widgets/desktop/screenshot/screenshot.cpp
+++ b/examples/widgets/desktop/screenshot/screenshot.cpp
@@ -59,7 +59,7 @@ Screenshot::Screenshot()
     screenshotLabel->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
     screenshotLabel->setAlignment(Qt::AlignCenter);
 
-    const QRect screenGeometry = QApplication::desktop()->screenGeometry(this);
+    const QRect screenGeometry = screen()->geometry();
     screenshotLabel->setMinimumSize(screenGeometry.width() / 8, screenGeometry.height() / 8);
 
     QVBoxLayout *mainLayout = new QVBoxLayout(this);
diff --git a/examples/widgets/dialogs/standarddialogs/main.cpp b/examples/widgets/dialogs/standarddialogs/main.cpp
index f7417f0e45..19ed2bf66f 100644
--- a/examples/widgets/dialogs/standarddialogs/main.cpp
+++ b/examples/widgets/dialogs/standarddialogs/main.cpp
@@ -49,8 +49,8 @@
 ****************************************************************************/
 
 #include <QApplication>
+#include <QScreen>
 #include <QStyleHints>
-#include <QDesktopWidget>
 #include <QTranslator>
 #include <QLocale>
 #include <QLibraryInfo>
@@ -73,7 +73,7 @@ int main(int argc, char *argv[])
 
     Dialog dialog;
     if (!QGuiApplication::styleHints()->showIsFullScreen() && !QGuiApplication::styleHints()->showIsMaximized()) {
-        const QRect availableGeometry = QApplication::desktop()->availableGeometry(&dialog);
+        const QRect availableGeometry = dialog.screen()->availableGeometry();
         dialog.resize(availableGeometry.width() / 3, availableGeometry.height() * 2 / 3);
         dialog.move((availableGeometry.width() - dialog.width()) / 2,
                     (availableGeometry.height() - dialog.height()) / 2);
diff --git a/examples/widgets/itemviews/dirview/main.cpp b/examples/widgets/itemviews/dirview/main.cpp
index 9fecffda40..fcdf4c7ba4 100644
--- a/examples/widgets/itemviews/dirview/main.cpp
+++ b/examples/widgets/itemviews/dirview/main.cpp
@@ -49,9 +49,9 @@
 ****************************************************************************/
 
 #include <QApplication>
-#include <QDesktopWidget>
 #include <QFileSystemModel>
 #include <QFileIconProvider>
+#include <QScreen>
 #include <QTreeView>
 #include <QCommandLineParser>
 #include <QCommandLineOption>
@@ -92,7 +92,7 @@ int main(int argc, char *argv[])
     tree.setAnimated(false);
     tree.setIndentation(20);
     tree.setSortingEnabled(true);
-    const QSize availableSize = QApplication::desktop()->availableGeometry(&tree).size();
+    const QSize availableSize = tree.screen()->availableGeometry().size();
     tree.resize(availableSize / 2);
     tree.setColumnWidth(0, tree.width() / 3);
 
diff --git a/examples/widgets/mainwindows/application/mainwindow.cpp b/examples/widgets/mainwindows/application/mainwindow.cpp
index 7886c4afac..d0c009427f 100644
--- a/examples/widgets/mainwindows/application/mainwindow.cpp
+++ b/examples/widgets/mainwindows/application/mainwindow.cpp
@@ -281,7 +281,7 @@ void MainWindow::readSettings()
     QSettings settings(QCoreApplication::organizationName(), QCoreApplication::applicationName());
     const QByteArray geometry = settings.value("geometry", QByteArray()).toByteArray();
     if (geometry.isEmpty()) {
-        const QRect availableGeometry = QApplication::desktop()->availableGeometry(this);
+        const QRect availableGeometry = screen()->availableGeometry();
         resize(availableGeometry.width() / 3, availableGeometry.height() / 2);
         move((availableGeometry.width() - width()) / 2,
              (availableGeometry.height() - height()) / 2);
diff --git a/examples/widgets/mainwindows/mdi/mainwindow.cpp b/examples/widgets/mainwindows/mdi/mainwindow.cpp
index b952d19e2e..ccfa7435d7 100644
--- a/examples/widgets/mainwindows/mdi/mainwindow.cpp
+++ b/examples/widgets/mainwindows/mdi/mainwindow.cpp
@@ -464,7 +464,7 @@ void MainWindow::readSettings()
     QSettings settings(QCoreApplication::organizationName(), QCoreApplication::applicationName());
     const QByteArray geometry = settings.value("geometry", QByteArray()).toByteArray();
     if (geometry.isEmpty()) {
-        const QRect availableGeometry = QApplication::desktop()->availableGeometry(this);
+        const QRect availableGeometry = screen()->availableGeometry();
         resize(availableGeometry.width() / 3, availableGeometry.height() / 2);
         move((availableGeometry.width() - width()) / 2,
              (availableGeometry.height() - height()) / 2);
diff --git a/examples/widgets/mainwindows/sdi/mainwindow.cpp b/examples/widgets/mainwindows/sdi/mainwindow.cpp
index a1fb42158e..c3cd131923 100644
--- a/examples/widgets/mainwindows/sdi/mainwindow.cpp
+++ b/examples/widgets/mainwindows/sdi/mainwindow.cpp
@@ -167,7 +167,7 @@ void MainWindow::tile(const QMainWindow *previous)
     if (!topFrameWidth)
         topFrameWidth = 40;
     const QPoint pos = previous->pos() + 2 * QPoint(topFrameWidth, topFrameWidth);
-    if (QApplication::desktop()->availableGeometry(this).contains(rect().bottomRight() + pos))
+    if (screen()->availableGeometry().contains(rect().bottomRight() + pos))
         move(pos);
 }
 
@@ -290,7 +290,7 @@ void MainWindow::readSettings()
     QSettings settings(QCoreApplication::organizationName(), QCoreApplication::applicationName());
     const QByteArray geometry = settings.value("geometry", QByteArray()).toByteArray();
     if (geometry.isEmpty()) {
-        const QRect availableGeometry = QApplication::desktop()->availableGeometry(this);
+        const QRect availableGeometry = screen()->availableGeometry();
         resize(availableGeometry.width() / 3, availableGeometry.height() / 2);
         move((availableGeometry.width() - width()) / 2,
              (availableGeometry.height() - height()) / 2);
diff --git a/examples/widgets/richtext/textedit/main.cpp b/examples/widgets/richtext/textedit/main.cpp
index aef186aa77..256d183811 100644
--- a/examples/widgets/richtext/textedit/main.cpp
+++ b/examples/widgets/richtext/textedit/main.cpp
@@ -51,9 +51,9 @@
 #include "textedit.h"
 
 #include <QApplication>
-#include <QDesktopWidget>
 #include <QCommandLineParser>
 #include <QCommandLineOption>
+#include <QScreen>
 
 int main(int argc, char *argv[])
 {
@@ -72,7 +72,7 @@ int main(int argc, char *argv[])
 
     TextEdit mw;
 
-    const QRect availableGeometry = QApplication::desktop()->availableGeometry(&mw);
+    const QRect availableGeometry = mw.screen()->availableGeometry();
     mw.resize(availableGeometry.width() / 2, (availableGeometry.height() * 2) / 3);
     mw.move((availableGeometry.width() - mw.width()) / 2,
             (availableGeometry.height() - mw.height()) / 2);
diff --git a/examples/widgets/tools/codecs/mainwindow.cpp b/examples/widgets/tools/codecs/mainwindow.cpp
index 6b601062b6..dc72fa73b7 100644
--- a/examples/widgets/tools/codecs/mainwindow.cpp
+++ b/examples/widgets/tools/codecs/mainwindow.cpp
@@ -54,12 +54,12 @@
 
 #include <QAction>
 #include <QApplication>
-#include <QDesktopWidget>
 #include <QFileDialog>
 #include <QMenuBar>
 #include <QMessageBox>
 #include <QPlainTextEdit>
 #include <QRegularExpression>
+#include <QScreen>
 #include <QTextCodec>
 #include <QTextStream>
 
@@ -78,7 +78,7 @@ MainWindow::MainWindow()
 
     setWindowTitle(tr("Codecs"));
 
-    const QRect screenGeometry = QApplication::desktop()->screenGeometry(this);
+    const QRect screenGeometry = screen()->geometry();
     resize(screenGeometry.width() / 2, screenGeometry.height() * 2 / 3);
 }
 
@@ -216,7 +216,7 @@ void MainWindow::encodingDialog()
 {
     if (!m_encodingDialog) {
         m_encodingDialog = new EncodingDialog(this);
-        const QRect screenGeometry = QApplication::desktop()->screenGeometry(this);
+        const QRect screenGeometry = screen()->geometry();
         m_encodingDialog->setMinimumWidth(screenGeometry.width() / 4);
     }
     m_encodingDialog->show();
diff --git a/examples/widgets/tools/codecs/previewform.cpp b/examples/widgets/tools/codecs/previewform.cpp
index ec75ebb9fa..f48651335a 100644
--- a/examples/widgets/tools/codecs/previewform.cpp
+++ b/examples/widgets/tools/codecs/previewform.cpp
@@ -52,12 +52,12 @@
 
 #include <QApplication>
 #include <QComboBox>
-#include <QDesktopWidget>
 #include <QDialogButtonBox>
 #include <QGridLayout>
 #include <QLabel>
 #include <QPlainTextEdit>
 #include <QPushButton>
+#include <QScreen>
 #include <QTextCodec>
 #include <QTextStream>
 
@@ -183,7 +183,7 @@ PreviewForm::PreviewForm(QWidget *parent)
     mainLayout->addWidget(statusLabel, 2, 0, 1, 2);
     mainLayout->addWidget(buttonBox, 3, 0, 1, 2);
 
-    const QRect screenGeometry = QApplication::desktop()->screenGeometry(this);
+    const QRect screenGeometry = screen()->geometry();
     resize(screenGeometry.width() * 2 / 5, screenGeometry.height() / 2);
 }
 
diff --git a/examples/widgets/tools/settingseditor/mainwindow.cpp b/examples/widgets/tools/settingseditor/mainwindow.cpp
index b9c2193ccb..ccca16ffcd 100644
--- a/examples/widgets/tools/settingseditor/mainwindow.cpp
+++ b/examples/widgets/tools/settingseditor/mainwindow.cpp
@@ -54,12 +54,12 @@
 
 #include <QAction>
 #include <QApplication>
-#include <QDesktopWidget>
 #include <QFileDialog>
 #include <QInputDialog>
 #include <QLineEdit>
 #include <QMenuBar>
 #include <QMessageBox>
+#include <QScreen>
 #include <QStandardPaths>
 #include <QStatusBar>
 
@@ -74,7 +74,7 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent)
     fallbacksAct->setChecked(true);
 
     setWindowTitle(QCoreApplication::applicationName());
-    const QRect availableGeometry = QApplication::desktop()->availableGeometry(this);
+    const QRect availableGeometry = screen()->availableGeometry();
     adjustSize();
     move((availableGeometry.width() - width()) / 2, (availableGeometry.height() - height()) / 2);
 }
diff --git a/examples/widgets/tools/settingseditor/settingstree.cpp b/examples/widgets/tools/settingseditor/settingstree.cpp
index b263746847..49d299bf72 100644
--- a/examples/widgets/tools/settingseditor/settingstree.cpp
+++ b/examples/widgets/tools/settingseditor/settingstree.cpp
@@ -52,8 +52,8 @@
 #include "variantdelegate.h"
 
 #include <QApplication>
-#include <QDesktopWidget>
 #include <QHeaderView>
+#include <QScreen>
 #include <QSettings>
 
 SettingsTree::SettingsTree(QWidget *parent)
@@ -93,7 +93,7 @@ void SettingsTree::setSettingsObject(const SettingsPtr &newSettings)
 
 QSize SettingsTree::sizeHint() const
 {
-    const QRect availableGeometry = QApplication::desktop()->availableGeometry(this);
+    const QRect availableGeometry = screen()->availableGeometry();
     return QSize(availableGeometry.width() * 2 / 3, availableGeometry.height() * 2 / 3);
 }
 
diff --git a/examples/widgets/widgets/charactermap/mainwindow.cpp b/examples/widgets/widgets/charactermap/mainwindow.cpp
index 25c4503ddb..b0f9705c21 100644
--- a/examples/widgets/widgets/charactermap/mainwindow.cpp
+++ b/examples/widgets/widgets/charactermap/mainwindow.cpp
@@ -64,6 +64,7 @@
 #include <QMenuBar>
 #include <QPlainTextEdit>
 #include <QPushButton>
+#include <QScreen>
 #include <QScrollArea>
 #include <QStatusBar>
 #include <QTextStream>
@@ -302,7 +303,7 @@ QString FontInfoDialog::text() const
 
 void MainWindow::showInfo()
 {
-    const QRect screenGeometry = QApplication::desktop()->screenGeometry(this);
+    const QRect screenGeometry = screen()->geometry();
     FontInfoDialog *dialog = new FontInfoDialog(this);
     dialog->setWindowTitle(tr("Fonts"));
     dialog->setAttribute(Qt::WA_DeleteOnClose);
diff --git a/examples/widgets/widgets/icons/main.cpp b/examples/widgets/widgets/icons/main.cpp
index a045ea765a..632795c18c 100644
--- a/examples/widgets/widgets/icons/main.cpp
+++ b/examples/widgets/widgets/icons/main.cpp
@@ -50,7 +50,7 @@
 
 #include <QApplication>
 #include <QCommandLineParser>
-#include <QDesktopWidget>
+#include <QScreen>
 
 #include "mainwindow.h"
 
@@ -77,7 +77,7 @@ int main(int argc, char *argv[])
     if (!commandLineParser.positionalArguments().isEmpty())
         mainWin.loadImages(commandLineParser.positionalArguments());
 
-    const QRect availableGeometry = QApplication::desktop()->availableGeometry(&mainWin);
+    const QRect availableGeometry = mainWin.screen()->availableGeometry();
     mainWin.resize(availableGeometry.width() / 2, availableGeometry.height() * 2 / 3);
     mainWin.move((availableGeometry.width() - mainWin.width()) / 2, (availableGeometry.height() - mainWin.height()) / 2);
 
diff --git a/examples/xml/dombookmarks/mainwindow.cpp b/examples/xml/dombookmarks/mainwindow.cpp
index fade2dfc96..b8f2e12918 100644
--- a/examples/xml/dombookmarks/mainwindow.cpp
+++ b/examples/xml/dombookmarks/mainwindow.cpp
@@ -63,7 +63,7 @@ MainWindow::MainWindow()
     statusBar()->showMessage(tr("Ready"));
 
     setWindowTitle(tr("DOM Bookmarks"));
-    const QSize availableSize = QApplication::desktop()->availableGeometry(this).size();
+    const QSize availableSize = screen()->availableGeometry().size();
     resize(availableSize.width() / 2, availableSize.height() / 3);
 }
 
diff --git a/examples/xml/saxbookmarks/mainwindow.cpp b/examples/xml/saxbookmarks/mainwindow.cpp
index 0583cd82cf..8b7733081f 100644
--- a/examples/xml/saxbookmarks/mainwindow.cpp
+++ b/examples/xml/saxbookmarks/mainwindow.cpp
@@ -74,7 +74,7 @@ MainWindow::MainWindow()
     statusBar()->showMessage(tr("Ready"));
 
     setWindowTitle(tr("SAX Bookmarks"));
-    const QSize availableSize = QApplication::desktop()->availableGeometry(this).size();
+    const QSize availableSize = screen()->availableGeometry().size();
     resize(availableSize.width() / 2, availableSize.height() / 3);
 }
 
diff --git a/examples/xml/streambookmarks/mainwindow.cpp b/examples/xml/streambookmarks/mainwindow.cpp
index c9a18fa3c4..d0e7bf30c9 100644
--- a/examples/xml/streambookmarks/mainwindow.cpp
+++ b/examples/xml/streambookmarks/mainwindow.cpp
@@ -75,7 +75,7 @@ MainWindow::MainWindow()
     statusBar()->showMessage(tr("Ready"));
 
     setWindowTitle(tr("QXmlStream Bookmarks"));
-    const QSize availableSize = QApplication::desktop()->availableGeometry(this).size();
+    const QSize availableSize = screen()->availableGeometry().size();
     resize(availableSize.width() / 2, availableSize.height() / 3);
 }
 //! [0]
diff --git a/src/widgets/util/qscroller.cpp b/src/widgets/util/qscroller.cpp
index 1e84237253..df05bbf71c 100644
--- a/src/widgets/util/qscroller.cpp
+++ b/src/widgets/util/qscroller.cpp
@@ -1031,7 +1031,8 @@ void QScrollerPrivate::setDpi(const QPointF &dpi)
 */
 void QScrollerPrivate::setDpiFromWidget(QWidget *widget)
 {
-    const QScreen *screen = QGuiApplication::screens().at(QApplication::desktop()->screenNumber(widget));
+    const QScreen *screen = widget ? widget->screen() : QGuiApplication::primaryScreen();
+    Q_ASSERT(screen);
     setDpi(QPointF(screen->physicalDotsPerInchX(), screen->physicalDotsPerInchY()));
 }
 
diff --git a/tests/auto/gui/kernel/qtouchevent/tst_qtouchevent.cpp b/tests/auto/gui/kernel/qtouchevent/tst_qtouchevent.cpp
index 13dc924f93..54bb8fe0bd 100644
--- a/tests/auto/gui/kernel/qtouchevent/tst_qtouchevent.cpp
+++ b/tests/auto/gui/kernel/qtouchevent/tst_qtouchevent.cpp
@@ -26,7 +26,7 @@
 **
 ****************************************************************************/
 
-#include <QtWidgets/QDesktopWidget>
+#include <QtGui/QScreen>
 #include <QtWidgets/QGraphicsItem>
 #include <QtWidgets/QGraphicsScene>
 #include <QtWidgets/QGraphicsView>
@@ -617,7 +617,7 @@ void tst_QTouchEvent::basicRawEventTranslation()
     QPointF pos = touchWidget.rect().center();
     QPointF screenPos = touchWidget.mapToGlobal(pos.toPoint());
     QPointF delta(10, 10);
-    QRectF screenGeometry = QApplication::desktop()->screenGeometry(&touchWidget);
+    QRectF screenGeometry = touchWidget.screen()->geometry();
 
     QTouchEvent::TouchPoint rawTouchPoint;
     rawTouchPoint.setId(0);
@@ -753,7 +753,7 @@ void tst_QTouchEvent::multiPointRawEventTranslationOnTouchScreen()
     QPointF leftScreenPos = leftWidget.mapToGlobal(leftPos.toPoint());
     QPointF rightScreenPos = rightWidget.mapToGlobal(rightPos.toPoint());
     QPointF centerScreenPos = touchWidget.mapToGlobal(centerPos.toPoint());
-    QRectF screenGeometry = QApplication::desktop()->screenGeometry(&touchWidget);
+    QRectF screenGeometry = touchWidget.screen()->geometry();
 
     QList<QTouchEvent::TouchPoint> rawTouchPoints;
     rawTouchPoints.append(QTouchEvent::TouchPoint(0));
@@ -968,7 +968,7 @@ void tst_QTouchEvent::touchOnMultipleTouchscreens()
     QPointF pos = touchWidget.rect().center();
     QPointF screenPos = touchWidget.mapToGlobal(pos.toPoint());
     QPointF delta(10, 10);
-    QRectF screenGeometry = QApplication::desktop()->screenGeometry(&touchWidget);
+    QRectF screenGeometry = touchWidget.screen()->geometry();
 
     QVector<QTouchEvent::TouchPoint> rawTouchPoints(3);
     rawTouchPoints[0].setId(0);
@@ -1131,7 +1131,7 @@ void tst_QTouchEvent::multiPointRawEventTranslationOnTouchPad()
     QPointF leftScreenPos = leftWidget.mapToGlobal(leftPos.toPoint());
     QPointF rightScreenPos = rightWidget.mapToGlobal(rightPos.toPoint());
     QPointF centerScreenPos = touchWidget.mapToGlobal(centerPos.toPoint());
-    QRectF screenGeometry = QApplication::desktop()->screenGeometry(&touchWidget);
+    QRectF screenGeometry = touchWidget.screen()->geometry();
 
     QList<QTouchEvent::TouchPoint> rawTouchPoints;
     rawTouchPoints.append(QTouchEvent::TouchPoint(0));
@@ -1348,7 +1348,7 @@ void tst_QTouchEvent::basicRawEventTranslationOfIds()
         screenPos << touchWidget.mapToGlobal(pos[i].toPoint());
     }
     QPointF delta(10, 10);
-    QRectF screenGeometry = QApplication::desktop()->screenGeometry(&touchWidget);
+    QRectF screenGeometry = touchWidget.screen()->geometry();
 
     QVector<QPointF> rawPosList;
     rawPosList << QPointF(12, 34) << QPointF(56, 78);
@@ -1629,7 +1629,7 @@ void tst_QTouchEvent::deleteInRawEventTranslation()
     QPointF leftScreenPos = leftWidget->mapToGlobal(leftPos.toPoint());
     QPointF centerScreenPos = centerWidget->mapToGlobal(centerPos.toPoint());
     QPointF rightScreenPos = rightWidget->mapToGlobal(rightPos.toPoint());
-    QRectF screenGeometry = QApplication::desktop()->screenGeometry(&touchWidget);
+    QRectF screenGeometry = touchWidget.screen()->geometry();
 
     QList<QTouchEvent::TouchPoint> rawTouchPoints;
     rawTouchPoints.append(QTouchEvent::TouchPoint(0));
diff --git a/tests/auto/widgets/graphicsview/qgraphicsitem/tst_qgraphicsitem.cpp b/tests/auto/widgets/graphicsview/qgraphicsitem/tst_qgraphicsitem.cpp
index 0b08586f7d..af0dd9b0f0 100644
--- a/tests/auto/widgets/graphicsview/qgraphicsitem/tst_qgraphicsitem.cpp
+++ b/tests/auto/widgets/graphicsview/qgraphicsitem/tst_qgraphicsitem.cpp
@@ -10977,7 +10977,7 @@ static QList<QTouchEvent::TouchPoint>
     tp.setStartScreenPos(screenPos);
     tp.setLastScreenPos(screenPos);
     tp.setEllipseDiameters(ellipseDiameters);
-    const QSizeF screenSize = QApplication::desktop()->screenGeometry(&view).size();
+    const QSizeF screenSize = view.screen()->geometry().size();
     tp.setNormalizedPos(QPointF(screenPos.x() / screenSize.width(), screenPos.y() / screenSize.height()));
     return QList<QTouchEvent::TouchPoint>() << tp;
 }
diff --git a/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp b/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp
index 3e372b76f5..40377eb946 100644
--- a/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp
+++ b/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp
@@ -5383,7 +5383,7 @@ void tst_QWidget::moveChild()
     parent.setStyle(style.data());
     ColorWidget child(&parent, Qt::Widget, Qt::blue);
 
-    parent.setGeometry(QRect(QPoint(QApplication::desktop()->availableGeometry(&parent).topLeft()) + QPoint(50, 50),
+    parent.setGeometry(QRect(parent.screen()->availableGeometry().topLeft() + QPoint(50, 50),
                              QSize(200, 200)));
     child.setGeometry(25, 25, 50, 50);
 #ifndef QT_NO_CURSOR // Try to make sure the cursor is not in a taskbar area to prevent tooltips or window highlighting
@@ -5430,8 +5430,7 @@ void tst_QWidget::showAndMoveChild()
     const QScopedPointer<QStyle> style(QStyleFactory::create(QLatin1String("Windows")));
     parent.setStyle(style.data());
 
-    QDesktopWidget desktop;
-    QRect desktopDimensions = desktop.availableGeometry(&parent);
+    QRect desktopDimensions = parent.screen()->availableGeometry();
     desktopDimensions = desktopDimensions.adjusted(64, 64, -64, -64);
 
 #ifndef QT_NO_CURSOR // Try to make sure the cursor is not in a taskbar area to prevent tooltips or window highlighting
@@ -7708,7 +7707,7 @@ void tst_QWidget::repaintWhenChildDeleted()
 #endif
     ColorWidget w(nullptr, Qt::FramelessWindowHint, Qt::red);
     w.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
-    QPoint startPoint = QApplication::desktop()->availableGeometry(&w).topLeft();
+    QPoint startPoint = w.screen()->availableGeometry().topLeft();
     startPoint.rx() += 50;
     startPoint.ry() += 50;
     w.setGeometry(QRect(startPoint, QSize(100, 100)));
@@ -7733,7 +7732,7 @@ void tst_QWidget::hideOpaqueChildWhileHidden()
 {
     ColorWidget w(nullptr, Qt::FramelessWindowHint, Qt::red);
     w.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
-    QPoint startPoint = QApplication::desktop()->availableGeometry(&w).topLeft();
+    QPoint startPoint = w.screen()->availableGeometry().topLeft();
     startPoint.rx() += 50;
     startPoint.ry() += 50;
     w.setGeometry(QRect(startPoint, QSize(100, 100)));
@@ -9601,8 +9600,7 @@ void tst_QWidget::rectOutsideCoordinatesLimit_task144779()
     palette.setColor(QPalette::Window, Qt::red);
     main.setPalette(palette);
 
-    QDesktopWidget desktop;
-    QRect desktopDimensions = desktop.availableGeometry(&main);
+    QRect desktopDimensions = main.screen()->availableGeometry();
     QSize mainSize(400, 400);
     mainSize = mainSize.boundedTo(desktopDimensions.size());
     main.resize(mainSize);
diff --git a/tests/auto/widgets/util/qcompleter/tst_qcompleter.cpp b/tests/auto/widgets/util/qcompleter/tst_qcompleter.cpp
index 5a51f15008..27ae41fc4f 100644
--- a/tests/auto/widgets/util/qcompleter/tst_qcompleter.cpp
+++ b/tests/auto/widgets/util/qcompleter/tst_qcompleter.cpp
@@ -1765,7 +1765,7 @@ void tst_QCompleter::QTBUG_52028_tabAutoCompletes()
     auto le = new QLineEdit;
     w.layout()->addWidget(le);
 
-    const auto pos = QApplication::desktop()->availableGeometry(&w).topLeft() + QPoint(200,200);
+    const auto pos = w.screen()->availableGeometry().topLeft() + QPoint(200,200);
     w.move(pos);
     w.show();
     QApplication::setActiveWindow(&w);
@@ -1806,7 +1806,7 @@ void tst_QCompleter::QTBUG_51889_activatedSentTwice()
 
     w.layout()->addWidget(new QLineEdit);
 
-    const auto pos = QApplication::desktop()->availableGeometry(&w).topLeft() + QPoint(200,200);
+    const auto pos = w.screen()->availableGeometry().topLeft() + QPoint(200,200);
     w.move(pos);
     w.show();
     QApplication::setActiveWindow(&w);
diff --git a/tests/auto/widgets/widgets/qcombobox/tst_qcombobox.cpp b/tests/auto/widgets/widgets/qcombobox/tst_qcombobox.cpp
index 4e16edaca8..b7869a0653 100644
--- a/tests/auto/widgets/widgets/qcombobox/tst_qcombobox.cpp
+++ b/tests/auto/widgets/widgets/qcombobox/tst_qcombobox.cpp
@@ -34,7 +34,6 @@
 #include <qpa/qplatformtheme.h>
 
 #include <qfontcombobox.h>
-#include <qdesktopwidget.h>
 #include <qapplication.h>
 #include <qpushbutton.h>
 #include <qdialog.h>
@@ -2212,15 +2211,13 @@ void tst_QComboBox::itemListPosition()
     QFontComboBox combo(&topLevel);
 
     layout->addWidget(&combo);
-    //the code to get the available screen space is copied from QComboBox code
-    const int scrNumber = QApplication::desktop()->screenNumber(&combo);
 
     bool useFullScreenForPopupMenu = false;
     if (const QPlatformTheme *theme = QGuiApplicationPrivate::platformTheme())
         useFullScreenForPopupMenu = theme->themeHint(QPlatformTheme::UseFullScreenForPopupMenu).toBool();
     const QRect screen = useFullScreenForPopupMenu ?
-                         QApplication::screens().at(scrNumber)->geometry() :
-                         QApplication::screens().at(scrNumber)->availableGeometry();
+                         combo.screen()->geometry() :
+                         combo.screen()->availableGeometry();
 
     topLevel.move(screen.width() - topLevel.sizeHint().width() - 10, 0); //puts the combo to the top-right corner
 
@@ -2440,8 +2437,7 @@ void tst_QComboBox::task248169_popupWithMinimalSize()
 #if defined QT_BUILD_INTERNAL
     QFrame *container = comboBox.findChild<QComboBoxPrivateContainer *>();
     QVERIFY(container);
-    QDesktopWidget desktop;
-    QTRY_VERIFY(desktop.screenGeometry(container).contains(container->geometry()));
+    QTRY_VERIFY(container->screen()->geometry().contains(container->geometry()));
 #endif
 }
 
diff --git a/tests/auto/widgets/widgets/qmenubar/tst_qmenubar.cpp b/tests/auto/widgets/widgets/qmenubar/tst_qmenubar.cpp
index d6ba85d61f..417d6e3124 100644
--- a/tests/auto/widgets/widgets/qmenubar/tst_qmenubar.cpp
+++ b/tests/auto/widgets/widgets/qmenubar/tst_qmenubar.cpp
@@ -34,7 +34,6 @@
 #include <qstyle.h>
 #include <qproxystyle.h>
 #include <qstylefactory.h>
-#include <qdesktopwidget.h>
 #include <qaction.h>
 #include <qstyleoption.h>
 #include <QVBoxLayout>
@@ -1149,8 +1148,8 @@ void tst_QMenuBar::check_menuPosition()
 
     Menu menu;
     menu.setTitle("&menu");
-    QRect availRect = QApplication::desktop()->availableGeometry(&w);
-    QRect screenRect = QApplication::desktop()->screenGeometry(&w);
+    QRect availRect = w.screen()->availableGeometry();
+    QRect screenRect = w.screen()->geometry();
 
     while(menu.sizeHint().height() < (screenRect.height()*2/3)) {
         menu.addAction("item");
diff --git a/tests/manual/dialogs/printdialogpanel.cpp b/tests/manual/dialogs/printdialogpanel.cpp
index 8d64d2f6a6..b7447e3d64 100644
--- a/tests/manual/dialogs/printdialogpanel.cpp
+++ b/tests/manual/dialogs/printdialogpanel.cpp
@@ -710,8 +710,7 @@ void PrintDialogPanel::showPreviewDialog()
     applySettings(m_printer.data());
     PrintPreviewDialog dialog(m_printer.data(), this);
 #if QT_VERSION >= 0x050000
-    const int screenNumber = QApplication::desktop()->screenNumber(this);
-    const QSize availableSize = QGuiApplication::screens().at(screenNumber)->availableSize();
+    const QSize availableSize = screen()->availableSize();
 #else
     const QSize availableSize = QApplication::desktop()->availableGeometry().size();
 #endif
diff --git a/tests/manual/qcursor/qcursorhighdpi/main.cpp b/tests/manual/qcursor/qcursorhighdpi/main.cpp
index 017f41eccd..e70be333fd 100644
--- a/tests/manual/qcursor/qcursorhighdpi/main.cpp
+++ b/tests/manual/qcursor/qcursorhighdpi/main.cpp
@@ -218,7 +218,7 @@ protected:
 
 VerticalRuler::VerticalRuler(QWidget *parent) : QWidget(parent)
 {
-    const int screenWidth = QApplication::desktop()->screenGeometry(this).width();
+    const int screenWidth = screen()->geometry().width();
     setFixedWidth(screenWidth / 48); // 1920 pixel monitor ->40
 }