/*

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

* All rights reserved.

*

* This program is free software: you can redistribute it and/or modify

* it under the terms of the GNU Lesser General Public License as published by

* the Free Software Foundation, version 2.1 of the License.

*

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

* GNU Lesser General Public License for more details.

*

* You should have received a copy of the GNU Lesser General Public License

* along with this program.  If not,

* see "http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html/".

*

* Description:

*

*/

/*

 W A R N I N G

 -------------

 THIS IS A TEMPORARY GESTURE CODE. WOULD BE REPLACED WHEN BROWSER HAS ITS OWN GESTURE FRAMEWORK

 */

#ifndef GestureRecognizer_p_h

#define GestureRecognizer_p_h

#include "GestureEvent.h"

#include <QBasicTimer>

#include <QObject>

#include <QTime>

class QGraphicsSceneMouseEvent;

class QPoint;

class QPointF;

namespace GVA {

class GestureListener;

class GestureRecognizer;

class GestureRecognizerPrivate : public QObject {

    Q_OBJECT

    Q_DECLARE_PUBLIC(GestureRecognizer)

public:

    //States of gesture recognizer

    enum State {

        Inactive,

        Press,

        Release,

        Move,

        DoublePress,

        LongPress

    };

    GestureRecognizerPrivate(GestureListener*);

    ~GestureRecognizerPrivate();

    bool mousePressEvent(QGraphicsSceneMouseEvent* event);

    bool mouseReleaseEvent(QGraphicsSceneMouseEvent* event);

    bool mouseMoveEvent(QGraphicsSceneMouseEvent* event);

    bool mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event);

protected:

    void changeState(State state);

    GestureEvent gestureEvent(const QPointF& pos, GestureEvent::Type type);

    void timerEvent(QTimerEvent* event);

    void resetTouchPositions();

    QPointF calculateVelocity(const QPointF& delta, int time);

private:

    GestureRecognizer* q_ptr;

    GestureListener* m_gestureListener;

    // state

    State m_state;

    //last moved time

    QTime m_lastTime;

    //time elapsed since last press

    QTime m_delayedPressMoment;

    //common timer for long tap or double tap recognition

    QBasicTimer m_timer;

    //Velocity factors

    qreal m_dragInertia;

    int m_directionErrorMargin;

    qreal m_axisLockThreshold;

    qreal m_maxVelocity;

    qreal m_minVelocity;

    int m_panningThreshold;

    qreal m_fastVelocityFactor;

    int m_scrollsPerSecond;

    QPointF m_velocity;

    //Touch positions

    QPointF m_position;

    QPointF m_initialPos;

    QGraphicsSceneMouseEvent* m_delayedReleaseEvent;

}; //GestureRecognizerPrivate

} //namespace GVA

#endif //GestureRecognizer_p_h