Multitouch, Cocoa: First revision of multi touch in Qt/Cocoa

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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
+
+#include <private/qmultitouch_mac_p.h>
+#include <qcursor.h>
+
+QT_BEGIN_NAMESPACE
+
+#ifdef QT_MAC_USE_COCOA
+
+QHash<int, QCocoaTouch*> QCocoaTouch::_currentTouches;
+QPointF QCocoaTouch::_screenReferencePos;
+QPointF QCocoaTouch::_trackpadReferencePos;
+bool QCocoaTouch::_inMouseDraggingState = false;
+int QCocoaTouch::_idAssignmentCount = 0;
+
+QCocoaTouch::QCocoaTouch(NSTouch *nstouch)
+{
+    _identity = int([nstouch identity]);
+
+    if (_currentTouches.size() == 0){
+        // A new touch sequence is about to begin:
+        _touchPoint.setState(Qt::TouchPointPressed | Qt::TouchPointPrimary);
+        NSPoint npos = [nstouch normalizedPosition];
+        _trackpadPos = QPointF(npos.x, npos.y);
+        // This touch will act as reference for all subsequent
+        // touches, so they appear next to each other on screen:
+        _trackpadReferencePos = _trackpadPos;
+        _screenReferencePos = QCursor::pos();
+        _touchPoint.setScreenPos(_screenReferencePos);
+        // The first touch should always have 0 as id:
+        _touchPoint.setId(0);
+        _idAssignmentCount = 0;
+        _currentTouches.insert(_identity, this);
+    } else {
+        // We are already tracking at least one touch point. 
+        _touchPoint.setId(++_idAssignmentCount);
+        _currentTouches.insert(_identity, this);
+        updateTouchData(nstouch, NSTouchPhaseBegan);
+    }
+}
+
+QCocoaTouch::~QCocoaTouch()
+{
+    _currentTouches.remove(_identity);
+}
+
+void QCocoaTouch::updateTouchData(NSTouch *nstouch, NSTouchPhase phase)
+{
+    NSPoint npos = [nstouch normalizedPosition];
+    _trackpadPos = QPointF(npos.x, npos.y);
+
+    if (_inMouseDraggingState || _currentTouches.size() == 1)
+        _touchPoint.setState(toTouchPointState(phase) | Qt::TouchPointPrimary);
+    else
+        _touchPoint.setState(toTouchPointState(phase));
+
+    // From the normalized position on the trackpad, calculate
+    // where on screen the touchpoint should be according to the
+    // reference position:
+    NSSize dsize = [nstouch deviceSize];
+    float ppiX = (_trackpadPos.x() - _trackpadReferencePos.x()) * dsize.width;
+    float ppiY = (_trackpadPos.y() - _trackpadReferencePos.y()) * dsize.height;
+    QPointF relativePos = _trackpadReferencePos - QPointF(ppiX, 1 - ppiY);
+    _touchPoint.setScreenPos(_screenReferencePos - relativePos);
+}
+
+QCocoaTouch *QCocoaTouch::findQCocoaTouch(NSTouch *nstouch)
+{
+    int identity = int([nstouch identity]);
+    if (_currentTouches.contains(identity))
+        return _currentTouches.value(identity);
+    return 0;
+}
+
+Qt::TouchPointState QCocoaTouch::toTouchPointState(NSTouchPhase nsState)
+{
+    Qt::TouchPointState qtState = Qt::TouchPointReleased;
+    switch (nsState) {
+        case NSTouchPhaseBegan:
+            qtState = Qt::TouchPointPressed;
+            break;
+        case NSTouchPhaseMoved:
+            qtState = Qt::TouchPointMoved;
+            break;
+        case NSTouchPhaseStationary:
+            qtState = Qt::TouchPointStationary;
+            break;
+        case NSTouchPhaseEnded:
+        case NSTouchPhaseCancelled:
+            qtState = Qt::TouchPointReleased;
+            break;
+        default:
+            break;
+    }
+    return qtState;
+}
+
+void QCocoaTouch::setMouseInDraggingState(bool inDraggingState)
+{
+    // In mouse dragging state, _all_ fingers control the mouse.
+    // As such, all fingers should have the primary flag.
+    _inMouseDraggingState = inDraggingState;
+}
+
+void QCocoaTouch::validateCurrentTouchList(NSEvent *event)
+{
+    // If the application shows the task switcher during a touch sequence
+    // we get into an inconsistant state. We try to detect that here:
+    NSTouchPhase p = NSTouchPhaseAny & ~NSTouchPhaseBegan;
+    NSSet *s = [event touchesMatchingPhase:p inView:nil];
+    if ([s count] == 0 && !_currentTouches.isEmpty()) {
+        // Remove all instances, and basically start from scratch:
+        QList<QCocoaTouch *> list = _currentTouches.values();
+        foreach (QCocoaTouch *t, _currentTouches.values())
+            delete t;
+        _currentTouches.clear();
+    }
+}
+
+QList<QTouchEvent::TouchPoint> QCocoaTouch::getCurrentTouchPointList(NSEvent *event)
+{
+    validateCurrentTouchList(event);
+    // Go through all the touchpoints in cocoa, find, or create, a QCocoaTouch for 
+    // them, update them, and return the result:
+    QList<QTouchEvent::TouchPoint> touchPoints;
+
+    NSSet *ended = [event touchesMatchingPhase:NSTouchPhaseEnded | NSTouchPhaseCancelled inView:nil];
+    for (int i=0; i<int([ended count]); ++i) {
+        NSTouch *touch = [[ended allObjects] objectAtIndex:i];
+        QCocoaTouch *qcocoaTouch = findQCocoaTouch(touch);
+        if (qcocoaTouch) {
+            qcocoaTouch->updateTouchData(touch, [touch phase]);
+            touchPoints.append(qcocoaTouch->_touchPoint);
+            delete qcocoaTouch;
+        }
+    }
+
+    NSSet *began = [event touchesMatchingPhase:NSTouchPhaseBegan inView:nil];
+    for (int i=0; i<int([began count]); ++i) {
+        NSTouch *touch = [[began allObjects] objectAtIndex:i];
+        QCocoaTouch *qcocoaTouch = findQCocoaTouch(touch);
+        if (!qcocoaTouch)
+            qcocoaTouch = new QCocoaTouch(touch);
+        else
+            qcocoaTouch->updateTouchData(touch, [touch phase]);
+        touchPoints.append(qcocoaTouch->_touchPoint);
+    }
+
+    NSSet *active = [event touchesMatchingPhase:NSTouchPhaseMoved | NSTouchPhaseStationary inView:nil];
+    for (int i=0; i<int([active count]); ++i) {
+        NSTouch *touch = [[active allObjects] objectAtIndex:i];
+        QCocoaTouch *qcocoaTouch = findQCocoaTouch(touch);
+        if (qcocoaTouch) {
+            qcocoaTouch->updateTouchData(touch, [touch phase]);
+            touchPoints.append(qcocoaTouch->_touchPoint);
+        }
+    }
+
+    return touchPoints;
+}
+
+#endif
+
+QT_END_NAMESPACE
+
+#endif // MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
+