Windows QPA: Use a QSharedPointer for the touch device

For reasons of symmetry with the tablet devices.

As a drive by, give it more distinct IDs.

Task-number: QTBUG-46412
Change-Id: Ie667621246b26db6fdda84c5ff2455fe38633cb3
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>

src/plugins/platforms/windows/qwindowscontext.cpp

@@ -349,19 +349,16 @@ bool QWindowsContext::initTouch(unsigned integrationOptions)
         return true;
     const bool usePointerHandler = (d->m_systemInfo & QWindowsContext::SI_SupportsPointer) != 0;
     auto touchDevice = usePointerHandler ? d->m_pointerHandler.touchDevice() : d->m_mouseHandler.touchDevice();
-    if (!touchDevice) {
+    if (touchDevice.isNull()) {
         const bool mouseEmulation =
             (integrationOptions & QWindowsIntegration::DontPassOsMouseEventsSynthesizedFromTouch) == 0;
         touchDevice = QWindowsPointerHandler::createTouchDevice(mouseEmulation);
     }
-    if (!touchDevice)
+    if (touchDevice.isNull())
         return false;
-    if (usePointerHandler)
+    d->m_pointerHandler.setTouchDevice(touchDevice);
-        d->m_pointerHandler.setTouchDevice(touchDevice);
+    d->m_mouseHandler.setTouchDevice(touchDevice);
-    else
+    QWindowSystemInterface::registerInputDevice(touchDevice.data());
-        d->m_mouseHandler.setTouchDevice(touchDevice);
-
-    QWindowSystemInterface::registerInputDevice(touchDevice);
 
     d->m_systemInfo |= QWindowsContext::SI_SupportsTouch;
 
@@ -1637,12 +1634,6 @@ void QWindowsContext::setAsyncExpose(bool value)
     d->m_asyncExpose = value;
 }
 
-QPointingDevice *QWindowsContext::touchDevice() const
-{
-    return (d->m_systemInfo & QWindowsContext::SI_SupportsPointer) ?
-        d->m_pointerHandler.touchDevice() : d->m_mouseHandler.touchDevice();
-}
-
 DWORD QWindowsContext::readAdvancedExplorerSettings(const wchar_t *subKey, DWORD defaultValue)
 {
     const auto value =

src/plugins/platforms/windows/qwindowscontext.h

@@ -266,8 +266,6 @@ public:
 
     static DWORD readAdvancedExplorerSettings(const wchar_t *subKey, DWORD defaultValue);
 
-    QPointingDevice *touchDevice() const;
-
     static bool filterNativeEvent(MSG *msg, LRESULT *result);
     static bool filterNativeEvent(QWindow *window, MSG *msg, LRESULT *result);
 

src/plugins/platforms/windows/qwindowsmousehandler.cpp

@@ -652,7 +652,7 @@ bool QWindowsMouseHandler::translateTouchEvent(QWindow *window, HWND,
         m_touchInputIDToTouchPointID.clear();
 
     QWindowSystemInterface::handleTouchEvent(window,
-                                             m_touchDevice,
+                                             m_touchDevice.data(),
                                              touchPoints,
                                              QWindowsKeyMapper::queryKeyboardModifiers());
     return true;

src/plugins/platforms/windows/qwindowsmousehandler.h

@@ -45,6 +45,7 @@
 
 #include <QtCore/qpointer.h>
 #include <QtCore/qhash.h>
+#include <QtCore/qsharedpointer.h>
 #include <QtGui/qevent.h>
 
 QT_BEGIN_NAMESPACE
@@ -56,10 +57,12 @@ class QWindowsMouseHandler
 {
     Q_DISABLE_COPY_MOVE(QWindowsMouseHandler)
 public:
+    using QPointingDevicePtr = QSharedPointer<QPointingDevice>;
+
     QWindowsMouseHandler();
 
-    QPointingDevice *touchDevice() const { return m_touchDevice; }
+    const QPointingDevicePtr &touchDevice() const { return m_touchDevice; }
-    void setTouchDevice(QPointingDevice *d) { m_touchDevice = d; }
+    void setTouchDevice(const QPointingDevicePtr &d) { m_touchDevice = d; }
 
     bool translateMouseEvent(QWindow *widget, HWND hwnd,
                              QtWindows::WindowsEventType t, MSG msg,
@@ -90,7 +93,7 @@ private:
     QPointer<QWindow> m_trackedWindow;
     QHash<DWORD, int> m_touchInputIDToTouchPointID;
     QHash<int, QPointF> m_lastTouchPositions;
-    QPointingDevice *m_touchDevice = nullptr;
+    QPointingDevicePtr m_touchDevice;
     bool m_leftButtonDown = false;
     QWindow *m_previousCaptureWindow = nullptr;
     QEvent::Type m_lastEventType = QEvent::None;

src/plugins/platforms/windows/qwindowspointerhandler.cpp

@@ -82,7 +82,6 @@ qint64 QWindowsPointerHandler::m_nextInputDeviceId = 1;
 
 QWindowsPointerHandler::~QWindowsPointerHandler()
 {
-    delete m_touchDevice;
 }
 
 bool QWindowsPointerHandler::translatePointerEvent(QWindow *window, HWND hwnd, QtWindows::WindowsEventType et, MSG msg, LRESULT *result)
@@ -320,7 +319,7 @@ static bool isValidWheelReceiver(QWindow *candidate)
     return false;
 }
 
-QPointingDevice *QWindowsPointerHandler::createTouchDevice(bool mouseEmulation)
+QWindowsPointerHandler::QPointingDevicePtr QWindowsPointerHandler::createTouchDevice(bool mouseEmulation)
 {
      const int digitizers = GetSystemMetrics(SM_DIGITIZER);
      if (!(digitizers & (NID_INTEGRATED_TOUCH | NID_EXTERNAL_TOUCH)))
@@ -339,15 +338,19 @@ QPointingDevice *QWindowsPointerHandler::createTouchDevice(bool mouseEmulation)
          capabilities.setFlag(QInputDevice::Capability::MouseEmulation);
      }
 
-     qCDebug(lcQpaEvents) << "Digitizers:" << Qt::hex << Qt::showbase << (digitizers & ~NID_READY)
+     const int flags = digitizers & ~NID_READY;
+     qCDebug(lcQpaEvents) << "Digitizers:" << Qt::hex << Qt::showbase << flags
          << "Ready:" << (digitizers & NID_READY) << Qt::dec << Qt::noshowbase
          << "Tablet PC:" << tabletPc << "Max touch points:" << maxTouchPoints << "Capabilities:" << capabilities;
 
      const int buttonCount = type == QInputDevice::DeviceType::TouchScreen ? 1 : 3;
      // TODO: use system-provided name and device ID rather than empty-string and m_nextInputDeviceId
-     return new QPointingDevice(QString(), m_nextInputDeviceId++,
+     const qint64 systemId = m_nextInputDeviceId++ | (qint64(flags << 2));
-                                type, QPointingDevice::PointerType::Finger,
+     auto d = new QPointingDevice(QString(), systemId, type,
-                                capabilities, maxTouchPoints, buttonCount);
+                                  QPointingDevice::PointerType::Finger,
+                                  capabilities, maxTouchPoints, buttonCount,
+                                  QString(), QPointingDeviceUniqueId::fromNumericId(systemId));
+     return QPointingDevicePtr(d);
 }
 
 void QWindowsPointerHandler::clearEvents()
@@ -466,7 +469,7 @@ bool QWindowsPointerHandler::translateTouchEvent(QWindow *window, HWND hwnd,
         return false;
 
     if (msg.message == WM_POINTERCAPTURECHANGED) {
-        QWindowSystemInterface::handleTouchCancelEvent(window, m_touchDevice,
+        QWindowSystemInterface::handleTouchCancelEvent(window, m_touchDevice.data(),
                                                        QWindowsKeyMapper::queryKeyboardModifiers());
         m_lastTouchPositions.clear();
         return true;
@@ -550,7 +553,7 @@ bool QWindowsPointerHandler::translateTouchEvent(QWindow *window, HWND hwnd,
     if (allStates == QEventPoint::State::Released)
         m_touchInputIDToTouchPointID.clear();
 
-    QWindowSystemInterface::handleTouchEvent(window, m_touchDevice, touchPoints,
+    QWindowSystemInterface::handleTouchEvent(window, m_touchDevice.data(), touchPoints,
                                              QWindowsKeyMapper::queryKeyboardModifiers());
     return false; // Allow mouse messages to be generated.
 }

src/plugins/platforms/windows/qwindowspointerhandler.h

@@ -65,9 +65,9 @@ public:
     bool translatePointerEvent(QWindow *window, HWND hwnd, QtWindows::WindowsEventType et, MSG msg, LRESULT *result);
     bool translateMouseEvent(QWindow *window, HWND hwnd, QtWindows::WindowsEventType et, MSG msg, LRESULT *result);
 
-    QPointingDevice *touchDevice() const { return m_touchDevice; }
+    const QPointingDevicePtr &touchDevice() const { return m_touchDevice; }
-    void setTouchDevice(QPointingDevice *d) { m_touchDevice = d; }
+    void setTouchDevice(const QPointingDevicePtr &d) { m_touchDevice = d; }
-    static QPointingDevice *createTouchDevice(bool mouseEmulation);
+    static QPointingDevicePtr createTouchDevice(bool mouseEmulation);
 
     QWindow *windowUnderMouse() const { return m_windowUnderPointer.data(); }
     void clearWindowUnderMouse() { m_windowUnderPointer = nullptr; }
@@ -83,7 +83,7 @@ private:
     QPointingDevicePtr findTabletDevice(QPointingDevice::PointerType pointerType) const;
 #endif
 
-    QPointingDevice *m_touchDevice = nullptr;
+    QPointingDevicePtr m_touchDevice;
 #if QT_CONFIG(tabletevent)
     QList<QPointingDevicePtr> m_tabletDevices;
 #endif