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, 4 insertions, 3 deletions

diff --git a/src/plugins/platforms/windows/qwindowsmousehandler.cpp b/src/plugins/platforms/windows/qwindowsmousehandler.cpp
index b940dcd62c..b1ced95a71 100644
--- a/src/plugins/platforms/windows/qwindowsmousehandler.cpp
+++ b/src/plugins/platforms/windows/qwindowsmousehandler.cpp
@@ -128,7 +128,10 @@ static inline QTouchDevice *createTouchDevice()
     QTouchDevice *result = new QTouchDevice;
     result->setType(digitizers & QT_NID_INTEGRATED_TOUCH
                     ? QTouchDevice::TouchScreen : QTouchDevice::TouchPad);
-    result->setCapabilities(QTouchDevice::Position | QTouchDevice::Area | QTouchDevice::NormalizedPosition);
+    QTouchDevice::Capabilities capabilities = QTouchDevice::Position | QTouchDevice::Area | QTouchDevice::NormalizedPosition;
+    if (result->type() == QTouchDevice::TouchPad)
+        capabilities |= QTouchDevice::MouseEmulation;
+    result->setCapabilities(capabilities);
     result->setMaximumTouchPoints(maxTouchPoints);
     return result;
 }
@@ -150,8 +153,6 @@ QWindowsMouseHandler::QWindowsMouseHandler() :
     m_leftButtonDown(false),
     m_previousCaptureWindow(0)
 {
-    if (m_touchDevice)
-        QWindowSystemInterface::registerTouchDevice(m_touchDevice);
 }
 
 Qt::MouseButtons QWindowsMouseHandler::queryMouseButtons()