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    40 ****************************************************************************/

    41 

    42 #include "mousepangesturerecognizer.h"

    43 

    44 #include <QEvent>

    45 #include <QVariant>

    46 #include <QGraphicsSceneMouseEvent>

    47 #include <QMouseEvent>

    48 #include <QGesture>

    49 

    50 MousePanGestureRecognizer::MousePanGestureRecognizer()

    51 {

    52 }

    53 

    54 QGesture* MousePanGestureRecognizer::create(QObject *)

    55 {

    56     return new QPanGesture;

    57 }

    58 

    59 QGestureRecognizer::Result MousePanGestureRecognizer::recognize(QGesture *state, QObject *, QEvent *event)

    60 {

    61     QPanGesture *g = static_cast<QPanGesture *>(state);

    62     QPoint globalPos;

    63     switch (event->type()) {

    64     case QEvent::GraphicsSceneMousePress:

    65     case QEvent::GraphicsSceneMouseDoubleClick:

    66     case QEvent::GraphicsSceneMouseMove:

    67     case QEvent::GraphicsSceneMouseRelease:

    68         globalPos = static_cast<QGraphicsSceneMouseEvent *>(event)->screenPos();

    69         break;

    70     case QEvent::MouseButtonPress:

    71     case QEvent::MouseMove:

    72     case QEvent::MouseButtonRelease:

    73         globalPos = static_cast<QMouseEvent *>(event)->globalPos();

    74         break;

    75     default:

    76         break;

    77     }

    78     if (event->type() == QEvent::MouseButtonPress || event->type() == QEvent::MouseButtonDblClick

    79         || event->type() == QEvent::GraphicsSceneMousePress || event->type() == QEvent::GraphicsSceneMouseDoubleClick) {

    80         g->setHotSpot(globalPos);

    81         g->setProperty("startPos", globalPos);

    82         g->setProperty("pressed", QVariant::fromValue<bool>(true));

    83         return QGestureRecognizer::TriggerGesture | QGestureRecognizer::ConsumeEventHint;

    84     } else if (event->type() == QEvent::MouseMove || event->type() == QEvent::GraphicsSceneMouseMove) {

    85         if (g->property("pressed").toBool()) {

    86             QPoint offset = globalPos - g->property("startPos").toPoint();

    87             g->setLastOffset(g->offset());

    88             g->setOffset(QPointF(offset.x(), offset.y()));

    89             return QGestureRecognizer::TriggerGesture | QGestureRecognizer::ConsumeEventHint;

    90         }

    91         return QGestureRecognizer::CancelGesture;

    92     } else if (event->type() == QEvent::MouseButtonRelease || event->type() == QEvent::GraphicsSceneMouseRelease) {

    93         return QGestureRecognizer::FinishGesture | QGestureRecognizer::ConsumeEventHint;

    94     }

    95     return QGestureRecognizer::Ignore;

    96 }

    97 

    98 void MousePanGestureRecognizer::reset(QGesture *state)

    99 {

   100     QPanGesture *g = static_cast<QPanGesture *>(state);

   101     g->setLastOffset(QPointF());

   102     g->setOffset(QPointF());

   103     g->setAcceleration(0);

   104     g->setProperty("startPos", QVariant());

   105     g->setProperty("pressed", QVariant::fromValue<bool>(false));

   106     QGestureRecognizer::reset(state);

   107 }