Windows: Suppress mouse events synthesized by OS.

Change the hint for
QPlatformIntegration::SynthesizeMouseFromTouchEvents to false
for Windows and suppress the events synthesized by OS.

The synthesized events cause touch events to generate 2 clicks
in Quick2.

Leave code as is for Windows CE.

Task-number: QTBUG-31386
Change-Id: Ia0987342dcdd55c8540810da5e4b90518a501ce6
Reviewed-by: Alan Alpert <aalpert@blackberry.com>
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>

2 files changed, 14 insertions, 0 deletions

diff --git a/src/plugins/platforms/windows/qwindowsintegration.cpp b/src/plugins/platforms/windows/qwindowsintegration.cpp
index 73df3ec032..814892b43a 100644
--- a/src/plugins/platforms/windows/qwindowsintegration.cpp
+++ b/src/plugins/platforms/windows/qwindowsintegration.cpp
@@ -552,11 +552,15 @@ QVariant QWindowsIntegration::styleHint(QPlatformIntegration::StyleHint hint) co
         break;
     case QPlatformIntegration::UseRtlExtensions:
         return QVariant(d->m_context.useRTLExtensions());
+#ifdef Q_OS_WINCE
     case QPlatformIntegration::SynthesizeMouseFromTouchEvents:
         // We do not want Qt to synthesize mouse events as Windows also does that.
         // Alternatively, Windows-generated touch mouse events can be identified and
         // ignored by checking GetMessageExtraInfo() for MI_WP_SIGNATURE (0xFF515700).
        return false;
+#endif // Q_OS_WINCE
+    default:
+        break;
     }
     return QPlatformIntegration::styleHint(hint);
 }
diff --git a/src/plugins/platforms/windows/qwindowsmousehandler.cpp b/src/plugins/platforms/windows/qwindowsmousehandler.cpp
index fd00a07d6c..5c096b7eca 100644
--- a/src/plugins/platforms/windows/qwindowsmousehandler.cpp
+++ b/src/plugins/platforms/windows/qwindowsmousehandler.cpp
@@ -157,9 +157,19 @@ bool QWindowsMouseHandler::translateMouseEvent(QWindow *window, HWND hwnd,
                                                QtWindows::WindowsEventType et,
                                                MSG msg, LRESULT *result)
 {
+    enum { signatureMask = 0xffffff00, miWpSignature = 0xff515700 };
+
     if (et == QtWindows::MouseWheelEvent)
         return translateMouseWheelEvent(window, hwnd, msg, result);
 
+#ifndef Q_OS_WINCE
+    // Check for events synthesized from touch. Lower byte is touch index, 0 means pen.
+    const LPARAM extraInfo = GetMessageExtraInfo();
+    const bool fromTouch = (extraInfo & signatureMask) == miWpSignature && (extraInfo & 0xff);
+    if (fromTouch)
+        return false;
+#endif // !Q_OS_WINCE
+
     const QPoint winEventPosition(GET_X_LPARAM(msg.lParam), GET_Y_LPARAM(msg.lParam));
     if (et & QtWindows::NonClientEventFlag) {
         const QPoint globalPosition = winEventPosition;