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    41 

    42 #ifndef QGESTUREMANAGER_P_H

    43 #define QGESTUREMANAGER_P_H

    44 

    45 //

    46 //  W A R N I N G

    47 //  -------------

    48 //

    49 // This file is not part of the Qt API.  It exists for the convenience

    50 // of other Qt classes.  This header file may change from version to

    51 // version without notice, or even be removed.

    52 //

    53 // We mean it.

    54 //

    55 

    56 #include "qobject.h"

    57 #include "qbasictimer.h"

    58 #include "private/qwidget_p.h"

    59 #include "qgesturerecognizer.h"

    60 

    61 QT_BEGIN_NAMESPACE

    62 

    63 class QBasicTimer;

    64 class QGraphicsObject;

    65 class QGestureManager : public QObject

    66 {

    67     Q_OBJECT

    68 public:

    69     QGestureManager(QObject *parent);

    70     ~QGestureManager();

    71 

    72     Qt::GestureType registerGestureRecognizer(QGestureRecognizer *recognizer);

    73     void unregisterGestureRecognizer(Qt::GestureType type);

    74 

    75     bool filterEvent(QWidget *receiver, QEvent *event);

    76     bool filterEvent(QObject *receiver, QEvent *event);

    77 #ifndef QT_NO_GRAPHICSVIEW

    78     bool filterEvent(QGraphicsObject *receiver, QEvent *event);

    79 #endif //QT_NO_GRAPHICSVIEW

    80 

    81     static QGestureManager* instance(); // declared in qapplication.cpp

    82 

    83     void cleanupCachedGestures(QObject *target, Qt::GestureType type);

    84 

    85     void recycle(QGesture *gesture);

    86 

    87 protected:

    88     void timerEvent(QTimerEvent *event);

    89     bool filterEventThroughContexts(const QMultiMap<QObject *, Qt::GestureType> &contexts,

    90                                     QEvent *event);

    91 

    92 private:

    93     QMultiMap<Qt::GestureType, QGestureRecognizer *> m_recognizers;

    94 

    95     QSet<QGesture *> m_activeGestures;

    96     QHash<QGesture *, QBasicTimer> m_maybeGestures;

    97 

    98     enum State {

    99         Gesture,

   100         NotGesture,

   101         MaybeGesture // this means timers are up and waiting for some

   102                      // more events, and input events are handled by

   103                      // gesture recognizer explicitely

   104     } state;

   105 

   106     struct ObjectGesture

   107     {

   108         QWeakPointer<QObject> object;

   109         Qt::GestureType gesture;

   110 

   111         ObjectGesture(QObject *o, const Qt::GestureType &g) : object(o), gesture(g) { }

   112         inline bool operator<(const ObjectGesture &rhs) const

   113         {

   114             if (object.data() < rhs.object.data())

   115                 return true;

   116             if (object == rhs.object)

   117                 return gesture < rhs.gesture;

   118             return false;

   119         }

   120     };

   121 

   122     QMap<ObjectGesture, QList<QGesture *> > m_objectGestures;

   123     QHash<QGesture *, QGestureRecognizer *> m_gestureToRecognizer;

   124     QHash<QGesture *, QObject *> m_gestureOwners;

   125 

   126     QHash<QGesture *, QWidget *> m_gestureTargets;

   127 

   128     int m_lastCustomGestureId;

   129 

   130     QHash<QGestureRecognizer *, QList<QGesture *> > m_obsoleteGestures;

   131     QHash<QGesture *, QGestureRecognizer *> m_deletedRecognizers;

   132     void cleanupGesturesForRemovedRecognizer(QGesture *gesture);

   133 

   134     QGesture *getState(QObject *widget, QGestureRecognizer *recognizer,

   135                        Qt::GestureType gesture);

   136     void deliverEvents(const QSet<QGesture *> &gestures,

   137                        QSet<QGesture *> *undeliveredGestures);

   138     void getGestureTargets(const QSet<QGesture*> &gestures,

   139                            QMap<QWidget *, QList<QGesture *> > *conflicts,

   140                            QMap<QWidget *, QList<QGesture *> > *normal);

   141 

   142     void cancelGesturesForChildren(QGesture *originatingGesture);

   143 };

   144 

   145 QT_END_NAMESPACE

   146 

   147 #endif // QGESTUREMANAGER_P_H