1 files changed, 54 insertions, 0 deletions
diff --git a/tests/auto/quick/pointerhandlers/qquickdraghandler/tst_qquickdraghandler.cpp b/tests/auto/quick/pointerhandlers/qquickdraghandler/tst_qquickdraghandler.cpp
index 4d6866041e..f71febbaf9 100644
--- a/tests/auto/quick/pointerhandlers/qquickdraghandler/tst_qquickdraghandler.cpp
+++ b/tests/auto/quick/pointerhandlers/qquickdraghandler/tst_qquickdraghandler.cpp
@@ -68,6 +68,7 @@ private slots:
     void touchPassiveGrabbers_data();
     void touchPassiveGrabbers();
     void touchPinchAndMouseMove();
+    void underModalLayer();
 
 private:
     void createView(QScopedPointer<QQuickView> &window, const char *fileName);
@@ -811,6 +812,59 @@ void tst_DragHandler::touchPinchAndMouseMove()
     }
 }
 
+class ModalLayer : public QQuickItem {
+public:
+    explicit ModalLayer(QQuickItem* parent = nullptr) : QQuickItem(parent) {
+        this->setAcceptedMouseButtons(Qt::AllButtons);
+        this->setAcceptTouchEvents(true);
+        this->setKeepMouseGrab(true);
+        this->setKeepTouchGrab(true);
+    }
+
+    bool event(QEvent* event) override {
+        switch (event->type()) {
+        case QEvent::KeyPress:
+        case QEvent::MouseMove:
+        case QEvent::MouseButtonPress:
+        case QEvent::MouseButtonRelease:
+        case QEvent::MouseTrackingChange:
+        case QEvent::MouseButtonDblClick:
+        case QEvent::Wheel:
+        case QEvent::TouchBegin:
+        case QEvent::TouchUpdate:
+        case QEvent::TouchCancel:
+        case QEvent::TouchEnd: {
+            qCDebug(lcPointerTests) << "BLOCK!" << event->type();
+            return true;
+        }
+        default: break;
+        }
+        return QQuickItem::event(event);
+    }
+};
+
+void tst_DragHandler::underModalLayer() // QTBUG-78258
+{
+    qmlRegisterType<ModalLayer>("Test", 1, 0, "ModalLayer");
+
+    const int dragThreshold = QGuiApplication::styleHints()->startDragDistance();
+    QScopedPointer<QQuickView> windowPtr;
+    createView(windowPtr, "dragHandlerUnderModalLayer.qml");
+    QQuickView * window = windowPtr.data();
+    QPointer<QQuickDragHandler> dragHandler = window->rootObject()->findChild<QQuickDragHandler*>();
+    QVERIFY(dragHandler);
+
+    QPoint p1(250, 250);
+    QTest::mousePress(window, Qt::LeftButton, Qt::NoModifier, p1);
+    p1 += QPoint(dragThreshold, dragThreshold);
+    QTest::mouseMove(window, p1);
+    QVERIFY(!dragHandler->active());
+    p1 += QPoint(dragThreshold, dragThreshold);
+    QTest::mouseMove(window, p1);
+    QVERIFY(!dragHandler->active());
+    QTest::mouseRelease(window, Qt::LeftButton);
+}
+
 QTEST_MAIN(tst_DragHandler)
 
 #include "tst_qquickdraghandler.moc"