Decide whether to synthesize mouse events on a per device basis

Currently Qt uses the QPlatformIntegration::StyleHint
SynthesizeMouseFromTouchEvents to check whether to synthesize mouse
events from touch events. But not only platform plugins can produce
touch events, they can be created by e.g. QTest::touchEvent() and in
this case we almost definitely need synthesizing regardless of the
platform.

This commit introduces a QTouchDevice::MouseEmulation capability which
replaces use of the QPlatformIntegration::SynthesizeMouseFromTouchEvents.
So it's possible to pass QTouchDevice without this capability to
QTest::touchEvent() and be sure that mouse events will be synthesized.
Notice that touch pads always emulate mouse events.
As a result we can activate some tests which were disabled for specific
platform configurations by commits 6c1670d8c273819435867c42725c0db0eee597dc
and e9760f1559361c39f269fb89f1ebd01f6ee8378d.

Change-Id: Idc82fa4007a095fc1cb5934979361b0023d2b793
Reviewed-by: Laszlo Agocs <laszlo.agocs@theqtcompany.com>

1 files changed, 2 insertions, 6 deletions

diff --git a/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp b/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp
index d717f26c52..e5e96d5b3d 100644
--- a/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp
+++ b/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp
@@ -9824,9 +9824,6 @@ public:
 
 void tst_QWidget::touchEventSynthesizedMouseEvent()
 {
-    // Pass if the platform does not want mouse event synhesizing
-    if (!QGuiApplicationPrivate::platformIntegration()->styleHint(QPlatformIntegration::SynthesizeMouseFromTouchEvents).toBool())
-        return;
     if (m_platform == QStringLiteral("wayland"))
         QSKIP("Wayland: This fails. Figure out why.");
 
@@ -9852,7 +9849,7 @@ void tst_QWidget::touchEventSynthesizedMouseEvent()
         QCOMPARE(widget.m_lastMouseEventPos, QPointF(15, 15));
         QTest::touchEvent(&widget, device).release(0, QPoint(20, 20), &widget);
         QCOMPARE(widget.m_touchEventCount, 0);
-        QCOMPARE(widget.m_mouseEventCount, 3);
+        QCOMPARE(widget.m_mouseEventCount, 4); // we receive extra mouse move event
         QCOMPARE(widget.m_lastMouseEventPos, QPointF(20, 20));
     }
 
@@ -9903,8 +9900,7 @@ void tst_QWidget::touchEventSynthesizedMouseEvent()
         QCOMPARE(parent.m_touchEventCount, 1);
         QCOMPARE(parent.m_mouseEventCount, 0);
         QCOMPARE(child.m_touchEventCount, 0);
-        QCOMPARE(child.m_mouseEventCount, 1); // Attempt at mouse event before propagation
-        QCOMPARE(child.m_lastMouseEventPos, QPointF(10, 10));
+        QCOMPARE(child.m_mouseEventCount, 0);
     }
 
     {