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    41 

    42 #include "private/qwinnativepangesturerecognizer_win_p.h"

    43 

    44 #include "qevent.h"

    45 #include "qgraphicsitem.h"

    46 #include "qgesture.h"

    47 

    48 #include "private/qgesture_p.h"

    49 #include "private/qevent_p.h"

    50 #include "private/qapplication_p.h"

    51 #include "private/qwidget_p.h"

    52 

    53 QT_BEGIN_NAMESPACE

    54 

    55 #if !defined(QT_NO_NATIVE_GESTURES)

    56 

    57 QWinNativePanGestureRecognizer::QWinNativePanGestureRecognizer()

    58 {

    59 }

    60 

    61 QGesture *QWinNativePanGestureRecognizer::create(QObject *target)

    62 {

    63     if (!target)

    64         return new QPanGesture; // a special case

    65     if (!target->isWidgetType())

    66         return 0;

    67     if (qobject_cast<QGraphicsObject *>(target))

    68         return 0;

    69 

    70     QWidget *q = static_cast<QWidget *>(target);

    71     QWidgetPrivate *d = q->d_func();

    72     d->nativeGesturePanEnabled = true;

    73     d->winSetupGestures();

    74 

    75     return new QPanGesture;

    76 }

    77 

    78 QGestureRecognizer::Result QWinNativePanGestureRecognizer::recognize(QGesture *state,

    79                                                                      QObject *,

    80                                                                      QEvent *event)

    81 {

    82     QPanGesture *q = static_cast<QPanGesture*>(state);

    83     QPanGesturePrivate *d = q->d_func();

    84 

    85     QGestureRecognizer::Result result = QGestureRecognizer::Ignore;

    86     if (event->type() == QEvent::NativeGesture) {

    87         QNativeGestureEvent *ev = static_cast<QNativeGestureEvent*>(event);

    88         switch(ev->gestureType) {

    89         case QNativeGestureEvent::GestureBegin:

    90             break;

    91         case QNativeGestureEvent::Pan:

    92             result = QGestureRecognizer::TriggerGesture;

    93             event->accept();

    94             break;

    95         case QNativeGestureEvent::GestureEnd:

    96             if (q->state() == Qt::NoGesture)

    97                 return QGestureRecognizer::Ignore; // some other gesture has ended

    98             result = QGestureRecognizer::FinishGesture;

    99             break;

   100         default:

   101             return QGestureRecognizer::Ignore;

   102         }

   103         if (q->state() == Qt::NoGesture) {

   104             d->lastOffset = d->offset = QPointF();

   105             d->startPosition = ev->position;

   106         } else {

   107             d->lastOffset = d->offset;

   108             d->offset = QPointF(ev->position.x() - d->startPosition.x(),

   109                                 ev->position.y() - d->startPosition.y());

   110         }

   111     }

   112     return result;

   113 }

   114 

   115 void QWinNativePanGestureRecognizer::reset(QGesture *state)

   116 {

   117     QPanGesture *pan = static_cast<QPanGesture*>(state);

   118     QPanGesturePrivate *d = pan->d_func();

   119 

   120     d->lastOffset = d->offset = QPointF();

   121     d->startPosition = QPoint();

   122     d->acceleration = 0;

   123 

   124     QGestureRecognizer::reset(state);

   125 }

   126 

   127 #endif // QT_NO_NATIVE_GESTURES

   128 

   129 QT_END_NAMESPACE