Make it possible to call grabToImage() on Window.contentItem

Window.contentItem was not associated with any QQmlContext and
QQmlEngine. A valid pointer to QQmlEngine is needed for callback
function execution.

Task-number: QTBUG-57175
Change-Id: Iab7730bfc8860521ff2e8c1631a11d0e1fe0cf94
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

1 files changed, 19 insertions, 0 deletions

diff --git a/tests/auto/quick/qquickwindow/tst_qquickwindow.cpp b/tests/auto/quick/qquickwindow/tst_qquickwindow.cpp
index 300ca392f9..dd00154935 100644
--- a/tests/auto/quick/qquickwindow/tst_qquickwindow.cpp
+++ b/tests/auto/quick/qquickwindow/tst_qquickwindow.cpp
@@ -370,6 +370,8 @@ private slots:
 
     void pointerEventTypeAndPointCount();
 
+    void grabContentItemToImage();
+
 private:
     QTouchDevice *touchDevice;
     QTouchDevice *touchDeviceWithVelocity;
@@ -2554,6 +2556,23 @@ void tst_qquickwindow::pointerEventTypeAndPointCount()
     QVERIFY(!pte.touchPointById(0));
 }
 
+void tst_qquickwindow::grabContentItemToImage()
+{
+    QQmlEngine engine;
+    QQmlComponent component(&engine);
+    component.loadUrl(testFileUrl("grabContentItemToImage.qml"));
+
+    QObject *created = component.create();
+    QScopedPointer<QObject> cleanup(created);
+    QVERIFY(created);
+
+    QQuickWindow *window = qobject_cast<QQuickWindow *>(created);
+    QVERIFY(QTest::qWaitForWindowActive(window));
+
+    QMetaObject::invokeMethod(window, "grabContentItemToImage");
+    QTRY_COMPARE(created->property("success").toInt(), 1);
+}
+
 QTEST_MAIN(tst_qquickwindow)
 
 #include "tst_qquickwindow.moc"