Refactored gesture api

Rewritten the api almost from scratch, making it simplier and more
flexible at the same time.

The current implementation will not have complex gseturemanager class
inside Qt, but the QGesture base class, which represents both a
gesture recognizer and a gesture itself with a set of properties. A
set of common gestures that can use used in third-party applications
(and in Qt itself internally) is supposed to be found in
qstandardgestures.h, and a base class for user-defined gestures is in
qgesture.h

Gesture implementation for Pan on Windows7 has also been added as a
reference implementation for platform gestures.

1 files changed, 89 insertions, 0 deletions

diff --git a/src/gui/kernel/qapplication_win.cpp b/src/gui/kernel/qapplication_win.cpp
index e1af0f7..13f19a3 100644
--- a/src/gui/kernel/qapplication_win.cpp
+++ b/src/gui/kernel/qapplication_win.cpp
@@ -89,6 +89,8 @@ extern void qt_wince_hide_taskbar(HWND hwnd); //defined in qguifunctions_wince.c
 #include <private/qkeymapper_p.h>
 #include <private/qlocale_p.h>
 #include "qevent_p.h"
+#include "qstandardgestures.h"
+#include "qstandardgestures_p.h"
 
 //#define ALIEN_DEBUG
 
@@ -451,6 +453,7 @@ public:
     bool        translateConfigEvent(const MSG &msg);
     bool        translateCloseEvent(const MSG &msg);
     bool        translateTabletEvent(const MSG &msg, PACKET *localPacketBuf, int numPackets);
+    bool        translateGestureEvent(const MSG &msg);
     void        repolishStyle(QStyle &style);
     inline void showChildren(bool spontaneous) { d_func()->showChildren(spontaneous); }
     inline void hideChildren(bool spontaneous) { d_func()->hideChildren(spontaneous); }
@@ -809,6 +812,33 @@ void qt_init(QApplicationPrivate *priv, int)
         QLibrary::resolve(QLatin1String("user32"), "SetProcessDPIAware"))
     ptrSetProcessDPIAware();
 #endif
+
+    priv->lastGestureId = 0;
+
+    priv->GetGestureInfo =
+        (PtrGetGestureInfo)QLibrary::resolve(QLatin1String("user32"),
+                                             "GetGestureInfo");
+    priv->GetGestureExtraArgs =
+        (PtrGetGestureExtraArgs)QLibrary::resolve(QLatin1String("user32"),
+                                                  "GetGestureExtraArgs");
+    priv->CloseGestureInfoHandle =
+        (PtrCloseGestureInfoHandle)QLibrary::resolve(QLatin1String("user32"),
+                                                     "CloseGestureInfoHandle");
+    priv->SetGestureConfig =
+        (PtrSetGestureConfig)QLibrary::resolve(QLatin1String("user32"),
+                                               "SetGestureConfig");
+    priv->GetGestureConfig =
+        (PtrGetGestureConfig)QLibrary::resolve(QLatin1String("user32"),
+                                               "GetGestureConfig");
+    priv->BeginPanningFeedback =
+        (PtrBeginPanningFeedback)QLibrary::resolve(QLatin1String("uxtheme"),
+                                                   "BeginPanningFeedback");
+    priv->UpdatePanningFeedback =
+        (PtrUpdatePanningFeedback)QLibrary::resolve(QLatin1String("uxtheme"),
+                                                   "UpdatePanningFeedback");
+    priv->EndPanningFeedback =
+        (PtrEndPanningFeedback)QLibrary::resolve(QLatin1String("uxtheme"),
+                                                   "EndPanningFeedback");
 }
 
 /*****************************************************************************
@@ -2469,6 +2499,10 @@ LRESULT CALLBACK QtWndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam
             }
             result = false;
             break;
+        case WM_GESTURE:
+            widget->translateGestureEvent(msg);
+            result = true;
+            break;
         default:
             result = false;                        // event was not processed
             break;
@@ -3649,6 +3683,60 @@ bool QETWidget::translateCloseEvent(const MSG &)
     return d_func()->close_helper(QWidgetPrivate::CloseWithSpontaneousEvent);
 }
 
+bool QETWidget::translateGestureEvent(const MSG &msg)
+{
+    GESTUREINFO gi;
+    gi.cbSize = sizeof(GESTUREINFO);
+    gi.dwFlags       = 0;
+    gi.ptsLocation.x = 0;
+    gi.ptsLocation.y = 0;
+    gi.dwID          = 0;
+    gi.dwInstanceID  = 0;
+    gi.dwSequenceID  = 0;
+
+    QApplicationPrivate *qAppPriv = getQApplicationPrivateInternal();
+    BOOL bResult = qAppPriv->GetGestureInfo((HGESTUREINFO)msg.lParam, &gi);
+
+    const QPoint widgetPos = QPoint(gi.ptsLocation.x, gi.ptsLocation.y);
+    QWidget *alienWidget = !internalWinId() ? this : childAt(widgetPos);
+    if (alienWidget && alienWidget->internalWinId())
+        alienWidget = 0;
+    QWidget *widget = alienWidget ? alienWidget : this;
+
+    QWinGestureEvent event;
+    event.sequenceId = gi.dwSequenceID;
+    event.position = QPoint(gi.ptsLocation.x, gi.ptsLocation.y);
+    if (bResult) {
+        switch (gi.dwID) {
+        case GID_BEGIN:
+            // we are not interested in this type of event.
+            break;
+        case GID_END:
+            event.gestureType = QWinGestureEvent::GestureEnd;
+            break;
+        case GID_ZOOM:
+            event.gestureType = QWinGestureEvent::Pinch;
+            break;
+        case GID_PAN:
+            event.gestureType = QWinGestureEvent::Pan;
+            break;
+        case GID_ROTATE:
+        case GID_TWOFINGERTAP:
+        case GID_ROLLOVER:
+        default:
+            break;
+        }
+        if (event.gestureType != QWinGestureEvent::None)
+            qt_sendSpontaneousEvent(widget, &event);
+    } else {
+        DWORD dwErr = GetLastError();
+        if (dwErr > 0)
+            qWarning() << "translateGestureEvent: error = " << dwErr;
+    }
+    qAppPriv->CloseGestureInfoHandle((HGESTUREINFO)msg.lParam);
+    return true;
+}
+
 
 void  QApplication::setCursorFlashTime(int msecs)
 {
@@ -3830,6 +3918,7 @@ void QSessionManager::cancel()
 
 #endif //QT_NO_SESSIONMANAGER
 
+
 qt_RegisterTouchWindowPtr QApplicationPrivate::RegisterTouchWindow = 0;
 qt_GetTouchInputInfoPtr QApplicationPrivate::GetTouchInputInfo = 0;
 qt_CloseTouchInputHandlePtr QApplicationPrivate::CloseTouchInputHandle = 0;