Dont use gestures if there is no touch screen.

If there is no touch input device attached on Windows7, we shouldn't even
bother subscribing to native gesture events.

Task-number: QTBUG-6007
Reviewed-by: Thierry
Reviewed-by: Prasanth

5 files changed, 73 insertions, 1 deletions

diff --git a/src/gui/kernel/qapplication_p.h b/src/gui/kernel/qapplication_p.h
index b3ec732..ce39334 100644
--- a/src/gui/kernel/qapplication_p.h
+++ b/src/gui/kernel/qapplication_p.h
@@ -530,6 +530,7 @@ public:
                                        const QList<QTouchEvent::TouchPoint> &touchPoints);
 
 #if defined(Q_WS_WIN)
+    static bool HasTouchSupport;
     static PtrRegisterTouchWindow RegisterTouchWindow;
     static PtrGetTouchInputInfo GetTouchInputInfo;
     static PtrCloseTouchInputHandle CloseTouchInputHandle;
diff --git a/src/gui/kernel/qapplication_win.cpp b/src/gui/kernel/qapplication_win.cpp
index da6869d..49cb0f2 100644
--- a/src/gui/kernel/qapplication_win.cpp
+++ b/src/gui/kernel/qapplication_win.cpp
@@ -115,6 +115,8 @@ extern void qt_wince_hide_taskbar(HWND hwnd); //defined in qguifunctions_wince.c
 #  include <winable.h>
 #endif
 
+#include "private/qwinnativepangesturerecognizer_win_p.h"
+
 #ifndef WM_TOUCH
 #  define WM_TOUCH 0x0240
 
@@ -4000,12 +4002,45 @@ void QSessionManager::cancel()
 #endif //QT_NO_SESSIONMANAGER
 
 
+bool QApplicationPrivate::HasTouchSupport = false;
 PtrRegisterTouchWindow QApplicationPrivate::RegisterTouchWindow = 0;
 PtrGetTouchInputInfo QApplicationPrivate::GetTouchInputInfo = 0;
 PtrCloseTouchInputHandle QApplicationPrivate::CloseTouchInputHandle = 0;
 
 void QApplicationPrivate::initializeMultitouch_sys()
 {
+    static const IID QT_IID_IInkTablets = {0x112086D9, 0x7779, 0x4535, {0xA6, 0x99, 0x86, 0x2B, 0x43, 0xAC, 0x18, 0x63} };
+    static const IID QT_IID_IInkTablet2 = {0x90c91ad2, 0xfa36, 0x49d6, {0x95, 0x16, 0xce, 0x8d, 0x57, 0x0f, 0x6f, 0x85} };
+    static const CLSID QT_CLSID_InkTablets = {0x6E4FCB12, 0x510A, 0x4d40, {0x93, 0x04, 0x1D, 0xA1, 0x0A, 0xE9, 0x14, 0x7C} };
+
+    IInkTablets *iInkTablets = 0;
+    HRESULT hr = CoCreateInstance(QT_CLSID_InkTablets, NULL, CLSCTX_ALL, QT_IID_IInkTablets, (void**)&iInkTablets);
+    if (SUCCEEDED(hr)) {
+        long count = 0;
+        iInkTablets->get_Count(&count);
+        for (long i = 0; i < count; ++i) {
+            IInkTablet *iInkTablet = 0;
+            hr = iInkTablets->Item(i, &iInkTablet);
+            if (FAILED(hr))
+                continue;
+            IInkTablet2 *iInkTablet2 = 0;
+            hr = iInkTablet->QueryInterface(QT_IID_IInkTablet2, (void**)&iInkTablet2);
+            iInkTablet->Release();
+            if (FAILED(hr))
+                continue;
+            TabletDeviceKind kind;
+            hr = iInkTablet2->get_DeviceKind(&kind);
+            iInkTablet2->Release();
+            if (FAILED(hr))
+                continue;
+            if (kind == TDK_Touch) {
+                QApplicationPrivate::HasTouchSupport = true;
+                break;
+            }
+        }
+        iInkTablets->Release();
+    }
+
     QLibrary library(QLatin1String("user32"));
     // MinGW (g++ 3.4.5) accepts only C casts.
     RegisterTouchWindow = (PtrRegisterTouchWindow)(library.resolve("RegisterTouchWindow"));
diff --git a/src/gui/kernel/qgesturemanager.cpp b/src/gui/kernel/qgesturemanager.cpp
index 89ad94d..aa6720e 100644
--- a/src/gui/kernel/qgesturemanager.cpp
+++ b/src/gui/kernel/qgesturemanager.cpp
@@ -45,6 +45,7 @@
 #include "private/qgesture_p.h"
 #include "private/qgraphicsitem_p.h"
 #include "private/qevent_p.h"
+#include "private/qapplication_p.h"
 #include "qgesture.h"
 #include "qevent.h"
 #include "qgraphicsitem.h"
@@ -86,7 +87,8 @@ QGestureManager::QGestureManager(QObject *parent)
 #endif
 #if defined(Q_OS_WIN)
   #if !defined(QT_NO_NATIVE_GESTURES)
-    registerGestureRecognizer(new QWinNativePanGestureRecognizer);
+    if (QApplicationPrivate::HasTouchSupport)
+        registerGestureRecognizer(new QWinNativePanGestureRecognizer);
   #endif
 #else
     registerGestureRecognizer(new QTapAndHoldGestureRecognizer);
diff --git a/src/gui/kernel/qwidget_win.cpp b/src/gui/kernel/qwidget_win.cpp
index 10522ed..9acfb70 100644
--- a/src/gui/kernel/qwidget_win.cpp
+++ b/src/gui/kernel/qwidget_win.cpp
@@ -2052,6 +2052,8 @@ void QWidgetPrivate::winSetupGestures()
     if (!q || !q->isVisible() || !nativeGesturePanEnabled)
         return;
 
+    if (!QApplicationPrivate::HasTouchSupport)
+        return;
     QApplicationPrivate *qAppPriv = QApplicationPrivate::instance();
     if (!qAppPriv->SetGestureConfig)
         return;
diff --git a/src/gui/kernel/qwinnativepangesturerecognizer_win_p.h b/src/gui/kernel/qwinnativepangesturerecognizer_win_p.h
index c65fa50..146b067 100644
--- a/src/gui/kernel/qwinnativepangesturerecognizer_win_p.h
+++ b/src/gui/kernel/qwinnativepangesturerecognizer_win_p.h
@@ -54,6 +54,38 @@
 //
 
 #include <QGestureRecognizer>
+#include <objbase.h>
+
+class IInkRectangle;
+class TabletHardwareCapabilities;
+class TabletPropertyMetricUnit;
+DECLARE_INTERFACE_(IInkTablet, IDispatch)
+{
+	STDMETHOD(get_Name)(THIS_ BSTR *Name) PURE;
+	STDMETHOD(get_PlugAndPlayId)(THIS_ BSTR *Id) PURE;
+	STDMETHOD(get_MaximumInputRectangle)(THIS_ IInkRectangle **Rectangle) PURE;
+	STDMETHOD(get_HardwareCapabilities)(THIS_ TabletHardwareCapabilities *Capabilities) PURE;
+	STDMETHOD(IsPacketPropertySupported)(THIS_ BSTR packetPropertyName) PURE;
+	STDMETHOD(GetPropertyMetrics)(THIS_ BSTR propertyName, long *Minimum, long *Maximum, TabletPropertyMetricUnit *Units, float *Resolution) PURE;
+};
+enum TabletDeviceKind
+{
+	TDK_Mouse = 0,
+	TDK_Pen   = 1,
+	TDK_Touch = 2
+};
+DECLARE_INTERFACE_(IInkTablet2, IDispatch)
+{
+	STDMETHOD(get_DeviceKind)(THIS_ TabletDeviceKind *Kind) PURE;
+};
+DECLARE_INTERFACE_(IInkTablets, IDispatch)
+{
+	STDMETHOD(get_Count)(THIS_ long *Count) PURE;
+	STDMETHOD(get__NewEnum)(THIS_ IUnknown **_NewEnum) PURE;
+	STDMETHOD(get_DefaultTablet)(THIS_ IInkTablet **DefaultTablet) PURE;
+	STDMETHOD(Item)(THIS_ long Index, IInkTablet **Tablet) PURE;
+	STDMETHOD(IsPacketPropertySupported)(THIS_ BSTR packetPropertyName, VARIANT_BOOL *Supported) PURE;
+};
 
 QT_BEGIN_NAMESPACE