Windows: Split code paths for touch/native gesture events.

Fix up 2b5df245d6 which routed
WM_GESTURE through QWindowsMouseHandler::translateTouchEvent()
causing asserts on missing touch devices.

Task-number: QTBUG-47184
Change-Id: Ie843ebb343e34487bcac9c9dbea88de641d51e28
Reviewed-by: Oliver Wolff <oliver.wolff@theqtcompany.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>

src/plugins/platforms/windows/qwindowscontext.cpp

@@ -919,7 +919,11 @@ bool QWindowsContext::windowsProc(HWND hwnd, UINT message,
     case QtWindows::InputMethodRequest:
         return QWindowsInputContext::instance()->handleIME_Request(wParam, lParam, result);
     case QtWindows::GestureEvent:
-        return d->m_mouseHandler.translateTouchEvent(platformWindow->window(), hwnd, et, msg, result);
+#if !defined(Q_OS_WINCE) && !defined(QT_NO_SESSIONMANAGER)
+        return platformSessionManager()->isInteractionBlocked() ? true : d->m_mouseHandler.translateGestureEvent(platformWindow->window(), hwnd, et, msg, result);
+#else
+        return d->m_mouseHandler.translateGestureEvent(platformWindow->window(), hwnd, et, msg, result);
+#endif
     case QtWindows::InputMethodOpenCandidateWindowEvent:
     case QtWindows::InputMethodCloseCandidateWindowEvent:
         // TODO: Release/regrab mouse if a popup has mouse grab.

src/plugins/platforms/windows/qwindowsmousehandler.cpp

@@ -472,12 +472,11 @@ bool QWindowsMouseHandler::translateScrollEvent(QWindow *window, HWND,
 }
 
 // from bool QApplicationPrivate::translateTouchEvent()
-bool QWindowsMouseHandler::translateTouchEvent(QWindow *window, HWND hwnd,
+bool QWindowsMouseHandler::translateTouchEvent(QWindow *window, HWND,
                                                QtWindows::WindowsEventType,
                                                MSG msg, LRESULT *)
 {
 #ifndef Q_OS_WINCE
-    Q_UNUSED(hwnd);
     typedef QWindowSystemInterface::TouchPoint QTouchPoint;
     typedef QList<QWindowSystemInterface::TouchPoint> QTouchPointList;
 
@@ -545,8 +544,24 @@ bool QWindowsMouseHandler::translateTouchEvent(QWindow *window, HWND hwnd,
     QWindowSystemInterface::handleTouchEvent(window,
                                              m_touchDevice,
                                              touchPoints);
+#else // !Q_OS_WINCE
+    Q_UNUSED(window)
+    Q_UNUSED(msg)
+#endif
     return true;
-#else //Q_OS_WINCE
+
+}
+
+bool QWindowsMouseHandler::translateGestureEvent(QWindow *window, HWND hwnd,
+                                                 QtWindows::WindowsEventType,
+                                                 MSG msg, LRESULT *)
+{
+#ifndef Q_OS_WINCE
+    Q_UNUSED(window)
+    Q_UNUSED(hwnd)
+    Q_UNUSED(msg)
+    return false;
+#else // !Q_OS_WINCE
     GESTUREINFO gi;
     memset(&gi, 0, sizeof(GESTUREINFO));
     gi.cbSize = sizeof(GESTUREINFO);
@@ -625,9 +640,8 @@ bool QWindowsMouseHandler::translateTouchEvent(QWindow *window, HWND hwnd,
             QWindowSystemInterface::handleEnterEvent(window);
         m_windowUnderMouse = window;
     }
-
     return true;
-#endif
+#endif // Q_OS_WINCE
 }
 
 QT_END_NAMESPACE

src/plugins/platforms/windows/qwindowsmousehandler.h

@@ -59,6 +59,9 @@ public:
     bool translateTouchEvent(QWindow *widget, HWND hwnd,
                              QtWindows::WindowsEventType t, MSG msg,
                              LRESULT *result);
+    bool translateGestureEvent(QWindow *window, HWND hwnd,
+                               QtWindows::WindowsEventType,
+                               MSG msg, LRESULT *);
     bool translateScrollEvent(QWindow *window, HWND hwnd,
                               MSG msg, LRESULT *result);