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#ifndef QGESTUREMANAGER_P_H

#define QGESTUREMANAGER_P_H

//

//  W A R N I N G

//  -------------

//

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

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

// version without notice, or even be removed.

//

// We mean it.

//

#include "qobject.h"

#include "qbasictimer.h"

#include "private/qwidget_p.h"

#include "qgesturerecognizer.h"

QT_BEGIN_NAMESPACE

class QBasicTimer;

class QGraphicsObject;

class QGestureManager : public QObject

{

    Q_OBJECT

public:

    QGestureManager(QObject *parent);

    ~QGestureManager();

    Qt::GestureType registerGestureRecognizer(QGestureRecognizer *recognizer);

    void unregisterGestureRecognizer(Qt::GestureType type);

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

    bool filterEvent(QGesture *receiver, QEvent *event);

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

    // declared in qapplication.cpp

    static QGestureManager* instance();

protected:

    void timerEvent(QTimerEvent *event);

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

                                    QEvent *event);

private:

    QMultiMap<Qt::GestureType, QGestureRecognizer *> recognizers;

    QSet<QGesture *> activeGestures;

    QMap<QGesture *, QBasicTimer> maybeGestures;

    enum State {

        Gesture,

        NotGesture,

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

                     // more events, and input events are handled by

                     // gesture recognizer explicitely

    } state;

    struct ObjectGesture

    {

        QWeakPointer<QObject> object;

        Qt::GestureType gesture;

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

        inline bool operator<(const ObjectGesture& rhs) const

        {

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

                return true;

            if (object == rhs.object)

                return gesture < rhs.gesture;

            return false;

        }

    };

    QMap<ObjectGesture, QGesture *> objectGestures;

    QMap<QGesture *, QGestureRecognizer *> gestureToRecognizer;

    QHash<QGesture *, QObject *> gestureOwners;

    QHash<QGesture *, QWidget *> gestureTargets;

    int lastCustomGestureId;

    QGesture *getState(QObject *widget, Qt::GestureType gesture);

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

                       QSet<QGesture *> *undeliveredGestures);

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

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

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

};

QT_END_NAMESPACE

#endif // QGESTUREMANAGER_P_H