source: trunk/src/gui/kernel/qmultitouch_mac.mm@ 754

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#include <private/qmultitouch_mac_p.h>
#include <qcursor.h>

#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6

QT_BEGIN_NAMESPACE

#ifdef QT_MAC_USE_COCOA

QHash<qint64, QCocoaTouch*> QCocoaTouch::_currentTouches;
QPointF QCocoaTouch::_screenReferencePos;
QPointF QCocoaTouch::_trackpadReferencePos;
int QCocoaTouch::_idAssignmentCount = 0;
int QCocoaTouch::_touchCount = 0;
bool QCocoaTouch::_updateInternalStateOnly = true;

QCocoaTouch::QCocoaTouch(NSTouch *nstouch)
{
    if (_currentTouches.size() == 0)
        _idAssignmentCount = 0;

    _touchPoint.setId(_idAssignmentCount++);
    _touchPoint.setPressure(1.0);
    _identity = qint64([nstouch identity]);
    _currentTouches.insert(_identity, this);
    updateTouchData(nstouch, NSTouchPhaseBegan);
}

QCocoaTouch::~QCocoaTouch()
{
    _currentTouches.remove(_identity);
}

void QCocoaTouch::updateTouchData(NSTouch *nstouch, NSTouchPhase phase)
{
    if (_touchCount == 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:
    NSPoint npos = [nstouch normalizedPosition];
    QPointF qnpos = QPointF(npos.x, 1 - npos.y);
    _touchPoint.setNormalizedPos(qnpos);

    if (_touchPoint.id() == 0 && phase == NSTouchPhaseBegan) {
        _trackpadReferencePos = qnpos;
        _screenReferencePos = QCursor::pos();
    }

    NSSize dsize = [nstouch deviceSize];
    float ppiX = (qnpos.x() - _trackpadReferencePos.x()) * dsize.width;
    float ppiY = (qnpos.y() - _trackpadReferencePos.y()) * dsize.height;
    QPointF relativePos = _trackpadReferencePos - QPointF(ppiX, ppiY);
    _touchPoint.setScreenPos(_screenReferencePos - relativePos);
}

QCocoaTouch *QCocoaTouch::findQCocoaTouch(NSTouch *nstouch)
{
    qint64 identity = qint64([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;
}

QList<QTouchEvent::TouchPoint>
QCocoaTouch::getCurrentTouchPointList(NSEvent *event, bool acceptSingleTouch)
{
    QMap<int, QTouchEvent::TouchPoint> touchPoints;
    NSSet *ended = [event touchesMatchingPhase:NSTouchPhaseEnded | NSTouchPhaseCancelled inView:nil];
    NSSet *active = [event
        touchesMatchingPhase:NSTouchPhaseBegan | NSTouchPhaseMoved | NSTouchPhaseStationary
        inView:nil];
    _touchCount = [active count];

    // First: remove touches that were ended by the user. If we are
    // currently not accepting single touches, a corresponding 'begin'
    // has never been send to the app for these events.