Refactor the touch event dispatching code in preparation for allowing external event generators

This introduces QEvent::RawTouch event type, which should be used by the low-level
translator. This raw QTouchEvent can be sent to either QApplication or to a window,
and Qt will do the rest to dispatch the touch points to the correct place.

6 files changed, 218 insertions, 136 deletions

diff --git a/src/gui/kernel/qapplication.cpp b/src/gui/kernel/qapplication.cpp
index 01c7c4a..3c7b808 100644
--- a/src/gui/kernel/qapplication.cpp
+++ b/src/gui/kernel/qapplication.cpp
@@ -4027,6 +4027,10 @@ bool QApplication::notify(QObject *receiver, QEvent *e)
         }
         break;
 #endif
+    case QEvent::RawTouch:
+        res = d->translateRawTouchEvent(qobject_cast<QWidget *>(receiver),
+                                        static_cast<QTouchEvent *>(e));
+        break;
     case QEvent::TouchBegin:
     // Note: TouchUpdate and TouchEnd events are sent to d->currentMultitouchWidget and never propagated
     {
@@ -5256,6 +5260,181 @@ void QApplicationPrivate::updateTouchPointsForWidget(QWidget *widget, QTouchEven
     }
 }
 
+void QApplicationPrivate::initializeMultitouch()
+{
+    widgetForTouchPointId.clear();
+    appCurrentTouchPoints.clear();
+
+    initializeMultitouch_sys();
+}
+
+void QApplicationPrivate::cleanupMultitouch()
+{
+    cleanupMultitouch_sys();
+
+    widgetForTouchPointId.clear();
+    appCurrentTouchPoints.clear();
+}
+
+QTouchEvent::TouchPoint *QApplicationPrivate::findClosestTouchPoint(const QPointF &screenPos)
+{
+    QTouchEvent::TouchPoint *closestTouchPoint = 0;
+    qreal closestDistance;
+    for (int i = 0; i < appCurrentTouchPoints.count(); ++i) {
+        QTouchEvent::TouchPoint *touchPoint = appCurrentTouchPoints.at(i);
+        qreal distance = QLineF(screenPos, touchPoint->screenPos()).length();
+        if (!closestTouchPoint || distance < closestDistance) {
+            closestTouchPoint = touchPoint;
+            closestDistance = distance;
+        }
+    }
+    return closestTouchPoint;
+}
+
+void QApplicationPrivate::appendTouchPoint(QTouchEvent::TouchPoint *touchPoint)
+{
+    // insort touch point
+    int at = 0;
+    for (; at < appCurrentTouchPoints.count(); ++at) {
+        if (appCurrentTouchPoints.at(at)->id() > touchPoint->id())
+            break;
+    }
+    appCurrentTouchPoints.insert(at, touchPoint);
+
+    if (appCurrentTouchPoints.count() > appAllTouchPoints.count()) {
+        qFatal("Qt: INTERNAL ERROR: appCurrentTouchPoints.count() (%d) > appAllTouchPoints.count() (%d)",
+               appCurrentTouchPoints.count(),
+               appAllTouchPoints.count());
+    }
+}
+
+void QApplicationPrivate::removeTouchPoint(QTouchEvent::TouchPoint *touchPoint)
+{
+    // remove touch point from all known touch points
+    for (int i = qMin(appCurrentTouchPoints.count() - 1, touchPoint->id()); i >= 0; --i) {
+        if (appCurrentTouchPoints.at(i) == touchPoint) {
+            appCurrentTouchPoints.removeAt(i);
+            break;
+        }
+    }
+}
+
+bool QApplicationPrivate::translateRawTouchEvent(QWidget *window, QTouchEvent *rawTouchEvent)
+{
+    Q_Q(QApplication);
+
+    typedef QPair<Qt::TouchPointStates, QList<QTouchEvent::TouchPoint *> > StatesAndTouchPoints;
+    QHash<QWidget *, StatesAndTouchPoints> widgetsNeedingEvents;
+
+    for (int i = 0; i < rawTouchEvent->touchPoints().count(); ++i) {
+        QTouchEvent::TouchPoint *touchPoint = rawTouchEvent->touchPoints().at(i);
+
+        // update state
+        QWidget *widget = 0;
+        switch (touchPoint->state()) {
+        case Qt::TouchPointPressed:
+        {
+            // determine which widget this event will go to
+            if (!window)
+                window = q->topLevelAt(touchPoint->screenPos().toPoint());
+            if (!window)
+                continue;
+            widget = window->childAt(window->mapFromGlobal(touchPoint->screenPos().toPoint()));
+            if (!widget)
+                widget = window;
+
+            QTouchEvent::TouchPoint *closestTouchPoint = findClosestTouchPoint(touchPoint->screenPos());
+            if (closestTouchPoint) {
+                QWidget *closestWidget = widgetForTouchPointId.value(closestTouchPoint->id());
+                if (closestWidget
+                    && (widget->isAncestorOf(closestWidget)
+                        || closestWidget->isAncestorOf(widget)))
+                    widget = closestWidget;
+            }
+            widgetForTouchPointId[touchPoint->id()] = widget;
+
+            appendTouchPoint(touchPoint);
+            break;
+        }
+        case Qt::TouchPointReleased:
+            widget = widgetForTouchPointId.take(touchPoint->id());
+            if (!widget)
+                continue;
+
+            removeTouchPoint(touchPoint);
+            break;
+        default:
+            widget = widgetForTouchPointId.value(touchPoint->id());
+            if (!widget)
+                continue;
+            break;
+        }
+        Q_ASSERT(widget != 0);
+
+        StatesAndTouchPoints &maskAndPoints = widgetsNeedingEvents[widget];
+        maskAndPoints.first |= touchPoint->state();
+        maskAndPoints.second.append(touchPoint);
+    }
+
+    if (widgetsNeedingEvents.isEmpty())
+        return false;
+
+    bool returnValue = false;
+
+    QHash<QWidget *, StatesAndTouchPoints>::ConstIterator it = widgetsNeedingEvents.constBegin();
+    const QHash<QWidget *, StatesAndTouchPoints>::ConstIterator end = widgetsNeedingEvents.constEnd();
+    for (; it != end; ++it) {
+        QWidget *widget = it.key();
+        if (!QApplicationPrivate::tryModalHelper(widget, 0))
+            continue;
+
+        QEvent::Type eventType;
+        switch(it.value().first) {
+        case Qt::TouchPointPressed:
+            eventType = QEvent::TouchBegin;
+            break;
+        case Qt::TouchPointReleased:
+            eventType = QEvent::TouchEnd;
+            break;
+        case Qt::TouchPointStationary:
+            // don't send the event if nothing changed
+            continue;
+        default:
+            eventType = QEvent::TouchUpdate;
+            break;
+        }
+
+        QTouchEvent touchEvent(eventType,
+                               q->keyboardModifiers(),
+                               it.value().first,
+                               it.value().second);
+        updateTouchPointsForWidget(widget, &touchEvent);
+
+        bool res = false;
+        switch (touchEvent.type()) {
+        case QEvent::TouchBegin:
+        {
+            // if the TouchBegin handler recurses, we assume that means the event
+            // has been implicitly accepted and continue to send touch events
+            widget->setAttribute(Qt::WA_AcceptedTouchBeginEvent);
+            res = QApplication::sendSpontaneousEvent(widget, &touchEvent)
+                  && touchEvent.isAccepted();
+            break;
+        }
+        default:
+            if (widget->testAttribute(Qt::WA_AcceptedTouchBeginEvent)) {
+                (void) QApplication::sendSpontaneousEvent(widget, &touchEvent);
+                res = true;
+            }
+            break;
+        }
+        returnValue = returnValue || res;
+    }
+
+    rawTouchEvent->setAccepted(returnValue);
+    return returnValue;
+}
+
 QT_END_NAMESPACE
 
 #include "moc_qapplication.cpp"
diff --git a/src/gui/kernel/qapplication_mac.mm b/src/gui/kernel/qapplication_mac.mm
index d5fa9ea..82fbd7b 100644
--- a/src/gui/kernel/qapplication_mac.mm
+++ b/src/gui/kernel/qapplication_mac.mm
@@ -2970,4 +2970,9 @@ void onApplicationChangedActivation( bool activated )
 #endif
 }
 
+void QApplicationPrivate::initializeMultitouch_sys()
+{ }
+void QApplicationPrivate::cleanupMultitouch_sys()
+{ }
+
 QT_END_NAMESPACE
diff --git a/src/gui/kernel/qapplication_p.h b/src/gui/kernel/qapplication_p.h
index 1424611..55d8fc4 100644
--- a/src/gui/kernel/qapplication_p.h
+++ b/src/gui/kernel/qapplication_p.h
@@ -435,7 +435,16 @@ public:
     QMap<QString, int> grabbedGestures;
 
     QHash<int, QWidget *> widgetForTouchPointId;
+    QList<QTouchEvent::TouchPoint *> appCurrentTouchPoints;
     static void updateTouchPointsForWidget(QWidget *widget, QTouchEvent *touchEvent);
+    void initializeMultitouch();
+    void initializeMultitouch_sys();
+    void cleanupMultitouch();
+    void cleanupMultitouch_sys();
+    QTouchEvent::TouchPoint *findClosestTouchPoint(const QPointF &screenPos);
+    void appendTouchPoint(QTouchEvent::TouchPoint *touchPoint);
+    void removeTouchPoint(QTouchEvent::TouchPoint *touchPoint);
+    bool translateRawTouchEvent(QWidget *widget, QTouchEvent *rawTouchEvent);
 
 #if defined(Q_WS_WIN)
     static qt_RegisterTouchWindowPtr RegisterTouchWindow;
@@ -444,12 +453,6 @@ public:
 
     QHash<DWORD, int> touchInputIDToTouchPointID;
     QVector<QTouchEvent::TouchPoint *> appAllTouchPoints;
-    QList<QTouchEvent::TouchPoint *> appCurrentTouchPoints;
-
-    void initializeMultitouch();
-    QTouchEvent::TouchPoint *findClosestTouchPoint(const QPointF &screenPos);
-    void appendTouchPoint(QTouchEvent::TouchPoint *touchPoint);
-    void removeTouchPoint(QTouchEvent::TouchPoint *touchPoint);
     bool translateTouchEvent(const MSG &msg);
 #endif
 
diff --git a/src/gui/kernel/qapplication_qws.cpp b/src/gui/kernel/qapplication_qws.cpp
index 1125610..a366ed6 100644
--- a/src/gui/kernel/qapplication_qws.cpp
+++ b/src/gui/kernel/qapplication_qws.cpp
@@ -3746,4 +3746,9 @@ void QApplication::setArgs(int c, char **v)
     d->argv = v;
 }
 
+void QApplicationPrivate::initializeMultitouch_sys()
+{ }
+void QApplicationPrivate::cleanupMultitouch_sys()
+{ }
+
 QT_END_NAMESPACE
diff --git a/src/gui/kernel/qapplication_win.cpp b/src/gui/kernel/qapplication_win.cpp
index f980f8e..a0c1184 100644
--- a/src/gui/kernel/qapplication_win.cpp
+++ b/src/gui/kernel/qapplication_win.cpp
@@ -3981,60 +3981,22 @@ qt_RegisterTouchWindowPtr QApplicationPrivate::RegisterTouchWindow = 0;
 qt_GetTouchInputInfoPtr QApplicationPrivate::GetTouchInputInfo = 0;
 qt_CloseTouchInputHandlePtr QApplicationPrivate::CloseTouchInputHandle = 0;
 
-void QApplicationPrivate::initializeMultitouch()
+void QApplicationPrivate::initializeMultitouch_sys()
 {
     QLibrary library(QLatin1String("user32"));
     RegisterTouchWindow = static_cast<qt_RegisterTouchWindowPtr>(library.resolve("RegisterTouchWindow"));
     GetTouchInputInfo = static_cast<qt_GetTouchInputInfoPtr>(library.resolve("GetTouchInputInfo"));
     CloseTouchInputHandle = static_cast<qt_CloseTouchInputHandlePtr>(library.resolve("CloseTouchInputHandle"));
 
-    widgetForTouchPointId.clear();
     touchInputIDToTouchPointID.clear();
     appAllTouchPoints.clear();
-    appCurrentTouchPoints.clear();
 }
 
-QTouchEvent::TouchPoint *QApplicationPrivate::findClosestTouchPoint(const QPointF &screenPos)
+void QApplicationPrivate::cleanupMultitouch_sys()
 {
-    QTouchEvent::TouchPoint *closestTouchPoint = 0;
-    qreal closestDistance;
-    for (int i = 0; i < appCurrentTouchPoints.count(); ++i) {
-        QTouchEvent::TouchPoint *touchPoint = appCurrentTouchPoints.at(i);
-        qreal distance = QLineF(screenPos, touchPoint->screenPos()).length();
-        if (!closestTouchPoint || distance < closestDistance) {
-            closestTouchPoint = touchPoint;
-            closestDistance = distance;
-        }
-    }
-    return closestTouchPoint;
-}
-
-void QApplicationPrivate::appendTouchPoint(QTouchEvent::TouchPoint *touchPoint)
-{    
-    // insort touch point
-    int at = 0;
-    for (; at < appCurrentTouchPoints.count(); ++at) {
-        if (appCurrentTouchPoints.at(at)->id() > touchPoint->id())
-            break;
-    }
-    appCurrentTouchPoints.insert(at, touchPoint);
-
-    if (appCurrentTouchPoints.count() > appAllTouchPoints.count()) {
-        qFatal("Qt: INTERNAL ERROR: appCurrentTouchPoints.count() (%d) > appAllTouchPoints.count() (%d)",
-               appCurrentTouchPoints.count(),
-               appAllTouchPoints.count());
-    }
-}
-
-void QApplicationPrivate::removeTouchPoint(QTouchEvent::TouchPoint *touchPoint)
-{
-    // remove touch point from all known touch points
-    for (int i = qMin(appCurrentTouchPoints.count() - 1, touchPoint->id()); i >= 0; --i) {
-        if (appCurrentTouchPoints.at(i) == touchPoint) {
-            appCurrentTouchPoints.removeAt(i);
-            break;
-        }
-    }
+    qDeleteAll(appAllTouchPoints);
+    appAllTouchPoints.clear();
+    touchInputIDToTouchPointID.clear();
 }
 
 bool QApplicationPrivate::translateTouchEvent(const MSG &msg)
@@ -4045,8 +4007,8 @@ bool QApplicationPrivate::translateTouchEvent(const MSG &msg)
     if (!widgetForHwnd)
         return false;
 
-    typedef QPair<Qt::TouchPointStates, QList<QTouchEvent::TouchPoint *> > StatesAndTouchPoints;
-    QHash<QWidget *, StatesAndTouchPoints> widgetsNeedingEvents;
+    Qt::TouchPointStates states = 0;
+    QList<QTouchEvent::TouchPoint *> touchPoints;
 
     QVector<TOUCHINPUT> winTouchInputs(msg.wParam);
     memset(winTouchInputs.data(), 0, sizeof(TOUCHINPUT) * winTouchInputs.count());
@@ -4068,45 +4030,21 @@ bool QApplicationPrivate::translateTouchEvent(const MSG &msg)
             touchPoint = appAllTouchPoints[touchPointID] = new QTouchEvent::TouchPoint(touchPointID);
 
         // update state
-        QWidget *widget = 0;
         bool down = touchPoint->state() != Qt::TouchPointReleased;
         QPointF screenPos(qreal(touchInput.x) / qreal(100.), qreal(touchInput.y) / qreal(100.));
 
         if (!down && (touchInput.dwFlags & TOUCHEVENTF_DOWN)) {
-            // determine which widget this event will go to
-            widget = widgetForHwnd->childAt(widgetForHwnd->mapFromGlobal(screenPos.toPoint()));
-            if (!widget)
-                widget = widgetForHwnd;
-
-            QTouchEvent::TouchPoint *closestTouchPoint = findClosestTouchPoint(screenPos);
-            if (closestTouchPoint) {
-                QWidget *closestWidget = widgetForTouchPointId.value(closestTouchPoint->id());
-                if (closestWidget
-                    && (widget->isAncestorOf(closestWidget)
-                        || closestWidget->isAncestorOf(widget)))
-                    widget = closestWidget;
-            }
-            widgetForTouchPointId[touchPoint->id()] = widget;
-
-            appendTouchPoint(touchPoint);
-
             touchPoint->setState(Qt::TouchPointPressed);
             touchPoint->setScreenPos(screenPos);
             touchPoint->setStartScreenPos(screenPos);
             touchPoint->setLastScreenPos(screenPos);
             touchPoint->setPressure(qreal(1.));
         } else if (down && (touchInput.dwFlags & TOUCHEVENTF_UP)) {
-            widget = widgetForTouchPointId.take(touchPoint->id());
-
-            removeTouchPoint(touchPoint);
-
             touchPoint->setState(Qt::TouchPointReleased);
             touchPoint->setLastScreenPos(touchPoint->screenPos());
             touchPoint->setScreenPos(screenPos);
             touchPoint->setPressure(qreal(0.));
         } else if (down) {
-            widget = widgetForTouchPointId.value(touchPoint->id());
-
             touchPoint->setState(screenPos == touchPoint->screenPos()
                                  ? Qt::TouchPointStationary
                                  : Qt::TouchPointMoved);
@@ -4114,71 +4052,18 @@ bool QApplicationPrivate::translateTouchEvent(const MSG &msg)
             touchPoint->setScreenPos(screenPos);
             // pressure should still be 1.
         }
-        Q_ASSERT(widget != 0);
 
-        StatesAndTouchPoints &maskAndPoints = widgetsNeedingEvents[widget];
-        maskAndPoints.first |= touchPoint->state();
-        maskAndPoints.second.append(touchPoint);
+        states |= touchPoint->state();
+        touchPoints.append(touchPoint);
     }
     QApplicationPrivate::CloseTouchInputHandle((HANDLE) msg.lParam);
 
-    if (widgetsNeedingEvents.isEmpty())
-        return false;
-
-    bool returnValue = false;
-    qt_tabletChokeMouse = false;
-
-    QHash<QWidget *, StatesAndTouchPoints>::ConstIterator it = widgetsNeedingEvents.constBegin();
-    const QHash<QWidget *, StatesAndTouchPoints>::ConstIterator end = widgetsNeedingEvents.constEnd();
-    for (; it != end; ++it) {
-        QWidget *widget = it.key();
-        if (!QApplicationPrivate::tryModalHelper(widget, 0))
-            continue;
-
-        QEvent::Type eventType;
-        switch(it.value().first) {
-        case Qt::TouchPointPressed:
-            eventType = QEvent::TouchBegin;
-            break;
-        case Qt::TouchPointReleased:
-            eventType = QEvent::TouchEnd;
-            break;
-        case Qt::TouchPointStationary:
-            // don't send the event if nothing changed
-            continue;
-        default:
-            eventType = QEvent::TouchUpdate;
-            break;
-        }
-
-        QTouchEvent touchEvent(eventType,
-                               q->keyboardModifiers(),
-                               it.value().first,
-                               it.value().second);
-        updateTouchPointsForWidget(widget, &touchEvent);
-
-        switch (touchEvent.type()) {
-        case QEvent::TouchBegin:
-        {
-            // if the TouchBegin handler recurses, we assume that means the event
-            // has been implicitly accepted and continue to send touch events
-            widget->setAttribute(Qt::WA_AcceptedTouchBeginEvent);
-            bool res = QApplication::sendSpontaneousEvent(widget, &touchEvent)
-                       && touchEvent.isAccepted();
-            returnValue = returnValue || (qt_tabletChokeMouse = qt_tabletChokeMouse || res);
-            break;
-        }
-        default:
-            if (widget->testAttribute(Qt::WA_AcceptedTouchBeginEvent)) {
-                (void) QApplication::sendSpontaneousEvent(widget, &touchEvent);
-                qt_tabletChokeMouse = true;
-            }
-            returnValue = returnValue || qt_tabletChokeMouse;
-            break;
-        }
-    }
-
-    return returnValue;
+    QTouchEvent touchEvent(QEvent::RawTouch,
+                           q->keyboardModifiers(),
+                           states,
+                           touchPoints);
+    return qt_tabletChokeMouse = (QApplication::sendSpontaneousEvent(widgetForHwnd, &touchEvent)
+                                  && touchEvent.isAccepted());
 }
 
 QT_END_NAMESPACE
diff --git a/src/gui/kernel/qapplication_x11.cpp b/src/gui/kernel/qapplication_x11.cpp
index 060e948..e16e416 100644
--- a/src/gui/kernel/qapplication_x11.cpp
+++ b/src/gui/kernel/qapplication_x11.cpp
@@ -5901,4 +5901,9 @@ void QSessionManager::requestPhase2()
 
 #endif // QT_NO_SESSIONMANAGER
 
+void QApplicationPrivate::initializeMultitouch_sys()
+{ }
+void QApplicationPrivate::cleanupMultitouch_sys()
+{ }
+
 QT_END_NAMESPACE