1 /*

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

     3 

     4     This library is free software; you can redistribute it and/or

     5     modify it under the terms of the GNU Library General Public

     6     License as published by the Free Software Foundation; either

     7     version 2 of the License, or (at your option) any later version.

     8 

     9     This library 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 GNU

    12     Library General Public License for more details.

    13 

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

    15     along with this library; see the file COPYING.LIB.  If not, write to

    16     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

    17     Boston, MA 02110-1301, USA.

    18 */

    19 

    20 #ifndef TouchGestureHandler_h

    21 #define TouchGestureHandler_h

    22 

    23 #include "PlatformTouchEvent.h"

    24 

    25 namespace WebCore {

    26 

    27 class TouchGestureHandler {

    28 

    29 public:

    30     TouchGestureHandler();

    31 

    32     void reset();

    33     void updateTouchPoints(const Vector<const PlatformTouchPoint*>& touchPoints);

    34 

    35     int translateX() const { return m_translate.x(); }

    36     int translateY() const { return m_translate.y(); }

    37     const IntPoint& pos() const { return m_pos; }

    38     const IntPoint& screenPos() const { return m_screenPos; }

    39     float scale() const { return m_scale; }

    40     float rotate() const { return m_rotate; }

    41 

    42 private:

    43     float calcAngle(const IntPoint& p1, const IntPoint& p2) const;

    44     float diffAngle(float alpha, float beta) const;

    45     IntPoint calcPos(const Vector<const PlatformTouchPoint*>& touchPoints) const;

    46     float calcDistance(const IntPoint& p1, const IntPoint& p2) const;

    47     void updateRefreshNeededState(const Vector<const PlatformTouchPoint*>& touchPoints);

    48 

    49     bool m_refreshNeeded;

    50     IntPoint m_translate;

    51     float m_scale;

    52     float m_rotate;

    53     IntPoint m_pos;

    54     IntPoint m_screenPos;

    55     float m_prevAngle;

    56     int m_prevSize;

    57     int m_prevIds[2];

    58     float m_prevDistance;

    59 };

    60 

    61 }

    62 

    63 #endif // TouchGestureHandler_h