QQuickWindow: obey AA_SynthesizeMouseForUnhandledTouchEvents

Until now, AA_SynthesizeMouseForUnhandledTouchEvents has only affected
behavior of QGuiApplicationPrivate::processTouchEvent, but had no
effect in Qt Quick.  QQuickWindow also accepts the touch event
just to make sure that QGuiApplication will not synthesize mouse
from touch, because it would be redundant: QQuickWindow does that
for itself.

Now we make it have an effect in Qt Quick too: skip mouse synthesis
if it is set to false.  This provides a way to simplify the
event delivery.  If you set it false, then you cannot manipulate old
mouse-only items like MouseArea and Flickable on a touchscreen.
(You can of course use event handlers for that.)

[ChangeLog][QtQuick][QQuickWindow] You can now disable touch->mouse
event synthesis in QtQuick by calling
qGuiApp.setAttribute(Qt::AA_SynthesizeMouseForUnhandledTouchEvents, false);
This will simplify and speed up event delivery, and it will also prevent
any and all interaction with mouse-only items like MouseArea and
Flickable on a touchscreen.

Task-number: QTBUG-52748
Change-Id: I71f1731b5abaeabd9dbce1112cd23bc97d24c12a
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Jan Arve Sæther <jan-arve.saether@qt.io>

1 files changed, 0 insertions, 10 deletions

diff --git a/tests/auto/quick/pointerhandlers/flickableinterop/tst_flickableinterop.cpp b/tests/auto/quick/pointerhandlers/flickableinterop/tst_flickableinterop.cpp
index 2d8b16cadd..e544eedf05 100644
--- a/tests/auto/quick/pointerhandlers/flickableinterop/tst_flickableinterop.cpp
+++ b/tests/auto/quick/pointerhandlers/flickableinterop/tst_flickableinterop.cpp
@@ -57,8 +57,6 @@ public:
     {}
 
 private slots:
-    void initTestCase();
-
     void touchTapButton_data();
     void touchTapButton();
     void touchDragFlickableBehindButton_data();
@@ -96,14 +94,6 @@ void tst_FlickableInterop::createView(QScopedPointer<QQuickView> &window, const
     QVERIFY(window->rootObject() != nullptr);
 }
 
-void tst_FlickableInterop::initTestCase()
-{
-    // This test assumes that we don't get synthesized mouse events from QGuiApplication
-    qApp->setAttribute(Qt::AA_SynthesizeMouseForUnhandledTouchEvents, false);
-
-    QQmlDataTest::initTestCase();
-}
-
 void tst_FlickableInterop::touchTapButton_data()
 {
     QTest::addColumn<QString>("buttonName");