Add way to override when to show context menu

Add Qt::ContextMenuTrigger enum used with
QStyleHints::setContextMenuTrigger() to override default platform
behavior when to trigger context menu event.
The default is to show context menu on mouse press on
UNIX systems and on mouse release on Windows.

Give developer a possibility to override platform default behavior
to make cross platform application that behaves the same way on all
platforms

Task-number: QTBUG-93486
Change-Id: Ic832d3d8a7c355a8adb46868fff9cfd19988cf3c
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

1 files changed, 40 insertions, 0 deletions

diff --git a/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp b/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp
index 3447c9af28..c68bb74f6e 100644
--- a/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp
+++ b/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp
@@ -477,6 +477,10 @@ private slots:
     void reparentWindowHandles_data();
     void reparentWindowHandles();
 
+#ifndef QT_NO_CONTEXTMENU
+    void contextMenuTrigger();
+#endif
+
 private:
     const QString m_platform;
     QSize m_testWidgetSize;
@@ -14040,5 +14044,41 @@ void tst_QWidget::reparentWindowHandles()
     }
 }
 
+#ifndef QT_NO_CONTEXTMENU
+void tst_QWidget::contextMenuTrigger()
+{
+    class ContextMenuWidget : public QWidget
+    {
+    public:
+        int events = 0;
+
+    protected:
+        void contextMenuEvent(QContextMenuEvent *) override { ++events; }
+    };
+
+    const Qt::ContextMenuTrigger wasTrigger = QGuiApplication::styleHints()->contextMenuTrigger();
+    auto restoreTriggerGuard = qScopeGuard([wasTrigger]{
+        QGuiApplication::styleHints()->setContextMenuTrigger(wasTrigger);
+    });
+
+    ContextMenuWidget widget;
+    widget.show();
+    QVERIFY(!qApp->topLevelWindows().empty());
+    auto *window = qApp->topLevelWindows()[0];
+    QVERIFY(window);
+    QCOMPARE(widget.events, 0);
+    QGuiApplication::styleHints()->setContextMenuTrigger(Qt::ContextMenuTrigger::Press);
+    QTest::mousePress(window, Qt::RightButton);
+    QCOMPARE(widget.events, 1);
+    QTest::mouseRelease(window, Qt::RightButton);
+    QCOMPARE(widget.events, 1);
+    QGuiApplication::styleHints()->setContextMenuTrigger(Qt::ContextMenuTrigger::Release);
+    QTest::mousePress(window, Qt::RightButton);
+    QCOMPARE(widget.events, 1);
+    QTest::mouseRelease(window, Qt::RightButton);
+    QCOMPARE(widget.events, 2);
+}
+#endif
+
 QTEST_MAIN(tst_QWidget)
 #include "tst_qwidget.moc"