Remove usages of deprecated APIs of QDesktopWidget

- Replaced the usages of the following deprecated APIs:
  * QDesktopWidget::screenCount() -> QGuiApplication::screens().size()
  * QDesktopWidget::screenGeometry(int) -> QGuiApplication::screens().at()
  * QDesktopWidget::screenNumber(QPoint) -> QGuiApplication::screenAt(QPoint)

- Added notes for the QWidget *QDesktopWidget::screen(int), which
currently has no replacement.

- Fixed the tests to build conditionally, only when these APIs are
enabled.

Task-number: QTBUG-76491
Change-Id: I2fdec96d0a6a4fc782c53549b05a5556412b8305
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

1 files changed, 3 insertions, 6 deletions

diff --git a/tests/manual/qcursor/qcursorhighdpi/main.cpp b/tests/manual/qcursor/qcursorhighdpi/main.cpp
index 3b18bff91c..017f41eccd 100644
--- a/tests/manual/qcursor/qcursorhighdpi/main.cpp
+++ b/tests/manual/qcursor/qcursorhighdpi/main.cpp
@@ -356,15 +356,12 @@ int main(int argc, char *argv[])
     QApplication app(argc, argv);
 
     MainWindowPtrList windows;
-
-    QDesktopWidget *desktopWidget = app.desktop();
-
     const int lastScreen = arguments.contains("-p")
         ? 0  // Primary screen only
-        : desktopWidget->screenCount() - 1; // All screens
+        : QGuiApplication::screens().size() - 1; // All screens
     for (int s = lastScreen; s >= 0; --s) {
-        MainWindowPtr window(new MainWindow(desktopWidget->screen(s)));
-        const QPoint pos = desktopWidget->screenGeometry(s).center() - QPoint(200, 100);
+        MainWindowPtr window(new MainWindow());
+        const QPoint pos = QGuiApplication::screens().at(s)->geometry().center() - QPoint(200, 100);
         window->move(pos);
         windows.append(window);
         window->show();