Windows: Create touch device in initialization.

Previously, the device was delay-created, which is a problem
if its type is to be used for determinining the pan gesture type.

Task-number: QTBUG-40461
Change-Id: I2dee3d7a3786a0fdf0a9b2b9e174dd121697ab44
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>

src/plugins/platforms/windows/qwindowscontext.cpp

@@ -102,15 +102,6 @@ static inline int componentVerbose(const char *v, const char *keyWord)
     return 0;
 }
 
-static inline bool hasTouchSupport(QSysInfo::WinVersion wv)
-{
-    enum { QT_SM_DIGITIZER = 94, QT_NID_INTEGRATED_TOUCH = 0x1,
-           QT_NID_EXTERNAL_TOUCH = 0x02, QT_NID_MULTI_INPUT = 0x40 };
-
-    return wv < QSysInfo::WV_WINDOWS7 ? false :
-           (GetSystemMetrics(QT_SM_DIGITIZER) & (QT_NID_INTEGRATED_TOUCH | QT_NID_EXTERNAL_TOUCH | QT_NID_MULTI_INPUT)) != 0;
-}
-
 #if !defined(LANG_SYRIAC)
 #    define LANG_SYRIAC 0x5a
 #endif
@@ -318,7 +309,7 @@ QWindowsContextPrivate::QWindowsContextPrivate()
     QWindowsContext::shell32dll.init();
     QWindowsContext::shcoredll.init();
 
-    if (hasTouchSupport(ver) && QWindowsContext::user32dll.initTouch())
+    if (m_mouseHandler.touchDevice() && QWindowsContext::user32dll.initTouch())
         m_systemInfo |= QWindowsContext::SI_SupportsTouch;
 #endif // !Q_OS_WINCE
     m_displayContext = GetDC(0);

src/plugins/platforms/windows/qwindowsmousehandler.cpp

@@ -109,6 +109,30 @@ static inline void compressMouseMove(MSG *msg)
     }
 }
 
+static inline QTouchDevice *createTouchDevice()
+{
+    enum { QT_SM_TABLETPC = 86, QT_SM_DIGITIZER = 94, QT_SM_MAXIMUMTOUCHES = 95,
+           QT_NID_INTEGRATED_TOUCH = 0x1, QT_NID_EXTERNAL_TOUCH = 0x02,
+           QT_NID_MULTI_INPUT = 0x40, QT_NID_READY = 0x80 };
+
+    if (QSysInfo::windowsVersion() < QSysInfo::WV_WINDOWS7)
+        return 0;
+    const int digitizers = GetSystemMetrics(QT_SM_DIGITIZER);
+    if (!(digitizers & (QT_NID_INTEGRATED_TOUCH | QT_NID_EXTERNAL_TOUCH)))
+        return 0;
+    const int tabletPc = GetSystemMetrics(QT_SM_TABLETPC);
+    const int maxTouchPoints = GetSystemMetrics(QT_SM_MAXIMUMTOUCHES);
+    qCDebug(lcQpaEvents) << "Digitizers:" << hex << showbase << (digitizers & ~QT_NID_READY)
+        << "Ready:" << (digitizers & QT_NID_READY) << dec << noshowbase
+        << "Tablet PC:" << tabletPc << "Max touch points:" << maxTouchPoints;
+    QTouchDevice *result = new QTouchDevice;
+    result->setType(digitizers & QT_NID_INTEGRATED_TOUCH
+                    ? QTouchDevice::TouchScreen : QTouchDevice::TouchPad);
+    result->setCapabilities(QTouchDevice::Position | QTouchDevice::Area | QTouchDevice::NormalizedPosition);
+    result->setMaximumTouchPoints(maxTouchPoints);
+    return result;
+}
+
 /*!
     \class QWindowsMouseHandler
     \brief Windows mouse handler
@@ -122,10 +146,12 @@ static inline void compressMouseMove(MSG *msg)
 QWindowsMouseHandler::QWindowsMouseHandler() :
     m_windowUnderMouse(0),
     m_trackedWindow(0),
-    m_touchDevice(0),
+    m_touchDevice(createTouchDevice()),
     m_leftButtonDown(false),
     m_previousCaptureWindow(0)
 {
+    if (m_touchDevice)
+        QWindowSystemInterface::registerTouchDevice(m_touchDevice);
 }
 
 Qt::MouseButtons QWindowsMouseHandler::queryMouseButtons()
@@ -404,6 +430,7 @@ bool QWindowsMouseHandler::translateTouchEvent(QWindow *window, HWND,
     typedef QWindowSystemInterface::TouchPoint QTouchPoint;
     typedef QList<QWindowSystemInterface::TouchPoint> QTouchPointList;
 
+    Q_ASSERT(m_touchDevice);
     const QRect screenGeometry = window->screen()->geometry();
 
     const int winTouchPointCount = msg.wParam;
@@ -464,14 +491,6 @@ bool QWindowsMouseHandler::translateTouchEvent(QWindow *window, HWND,
     if (allStates == Qt::TouchPointReleased)
         m_touchInputIDToTouchPointID.clear();
 
-    if (!m_touchDevice) {
-        m_touchDevice = new QTouchDevice;
-        // TODO: Device used to be hardcoded to screen in previous code.
-        m_touchDevice->setType(QTouchDevice::TouchScreen);
-        m_touchDevice->setCapabilities(QTouchDevice::Position | QTouchDevice::Area | QTouchDevice::NormalizedPosition);
-        QWindowSystemInterface::registerTouchDevice(m_touchDevice);
-    }
-
     QWindowSystemInterface::handleTouchEvent(window,
                                              m_touchDevice,
                                              touchPoints);

src/plugins/platforms/windows/qwindowsmousehandler.h

@@ -51,6 +51,8 @@ class QWindowsMouseHandler
 public:
     QWindowsMouseHandler();
 
+    QTouchDevice *touchDevice() const { return m_touchDevice; }
+
     bool translateMouseEvent(QWindow *widget, HWND hwnd,
                              QtWindows::WindowsEventType t, MSG msg,
                              LRESULT *result);