1 /*

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

     3 * All rights reserved.

     4 *

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

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

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

     8 *

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

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

    11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    12 * GNU Lesser General Public License for more details.

    13 *

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

    15 * along with this program.  If not,

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

    17 *

    18 * Description:

    19 *

    20 */

    21 

    22 /*

    23  W A R N I N G

    24  -------------

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

    26  */

    27 

    28 #ifndef GestureRecognizer_p_h

    29 #define GestureRecognizer_p_h

    30 

    31 #include "GestureEvent.h"

    32 

    33 #include <QBasicTimer>

    34 #include <QObject>

    35 #include <QTime>

    36 

    37 class QGraphicsSceneMouseEvent;

    38 class QPoint;

    39 class QPointF;

    40 

    41 namespace GVA {

    42 

    43 class GestureListener;

    44 class GestureRecognizer;

    45 

    46 class GestureRecognizerPrivate : public QObject {

    47     Q_OBJECT

    48     Q_DECLARE_PUBLIC(GestureRecognizer)

    49 

    50 public:

    51     //States of gesture recognizer

    52     enum State {

    53         Inactive,

    54         Press,

    55         Release,

    56         Move,

    57         DoublePress,

    58         LongPress

    59     };

    60 

    61     GestureRecognizerPrivate(GestureListener*);

    62     ~GestureRecognizerPrivate();

    63 

    64     bool mousePressEvent(QGraphicsSceneMouseEvent* event);

    65     bool mouseReleaseEvent(QGraphicsSceneMouseEvent* event);

    66     bool mouseMoveEvent(QGraphicsSceneMouseEvent* event);

    67     bool mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event);

    68 

    69 protected:

    70     void changeState(State state);

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

    72     void timerEvent(QTimerEvent* event);

    73     void resetTouchPositions();

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

    75 

    76 private:

    77     GestureRecognizer* q_ptr;

    78     GestureListener* m_gestureListener;

    79 

    80     // state

    81     State m_state;

    82 

    83     //last moved time

    84     QTime m_lastTime;

    85     //time elapsed since last press

    86     QTime m_delayedPressMoment;

    87     //common timer for long tap or double tap recognition

    88     QBasicTimer m_timer;

    89 

    90     //Velocity factors

    91     qreal m_dragInertia;

    92     int m_directionErrorMargin;

    93     qreal m_axisLockThreshold;

    94     qreal m_maxVelocity;

    95     qreal m_minVelocity;

    96     int m_panningThreshold;

    97     qreal m_fastVelocityFactor;

    98     int m_scrollsPerSecond;

    99 

   100     QPointF m_velocity;

   101 

   102     //Touch positions

   103     QPointF m_position;

   104     QPointF m_initialPos;

   105 

   106     QGraphicsSceneMouseEvent* m_delayedReleaseEvent;

   107 }; //GestureRecognizerPrivate

   108 

   109 } //namespace GVA

   110 #endif //GestureRecognizer_p_h