/****************************************************************************

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the QtGui module of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:LGPL$

** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

** Alternatively, this file may be used under the terms of the GNU Lesser

** General Public License version 2.1 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL included in the

** packaging of this file.  Please review the following information to

** ensure the GNU Lesser General Public License version 2.1 requirements

** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

** Nokia at qt-info@nokia.com.

**

**

**

**

**

**

**

**

** $QT_END_LICENSE$

**

****************************************************************************/

#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(QObject *receiver, QEvent *event);

#ifndef QT_NO_GRAPHICSVIEW

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

#endif //QT_NO_GRAPHICSVIEW

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

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

    void recycle(QGesture *gesture);

protected:

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

                                    QEvent *event);

private:

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

    QSet<QGesture *> m_activeGestures;

    QSet<QGesture *> m_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, QList<QGesture *> > m_objectGestures;

    QHash<QGesture *, QGestureRecognizer *> m_gestureToRecognizer;

    QHash<QGesture *, QObject *> m_gestureOwners;

    QHash<QGesture *, QWidget *> m_gestureTargets;

    int m_lastCustomGestureId;

    QHash<QGestureRecognizer *, QSet<QGesture *> > m_obsoleteGestures;

    QHash<QGesture *, QGestureRecognizer *> m_deletedRecognizers;

    void cleanupGesturesForRemovedRecognizer(QGesture *gesture);

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

                       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);

    void cancelGesturesForChildren(QGesture *originatingGesture);

};

QT_END_NAMESPACE

#endif // QGESTUREMANAGER_P_H