TouchInput.h

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/* Copyright (C) 2012 Wildfire Games.
 * This file is part of 0 A.D.
 *
 * 0 A.D. is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * 0 A.D. 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef INCLUDED_TOUCHINPUT
#define INCLUDED_TOUCHINPUT

#include "lib/input.h"
#include "maths/Vector2D.h"
#include "maths/Vector3D.h"

/**
 * Maps touch events (e.g. on Android touchscreen devices) onto mouse events
 * and camera movement.
 */
class CTouchInput
{
public:
    CTouchInput();
    ~CTouchInput();

    /**
     * Returns whether the touch input mode is enabled for this device.
     */
    bool IsEnabled();

    InReaction HandleEvent(const SDL_Event_* ev);

    /**
     * Should be called once per frame to perform updates.
     */
    void Frame();

private:
    void OnFingerDown(int id, int x, int y);
    void OnFingerUp(int id, int x, int y);
    void OnFingerMotion(int id, int x, int y);

    // Mouse emulation state:
    enum
    {
        MOUSE_INACTIVE,
        MOUSE_ACTIVATING,
        MOUSE_ACTIVE_UP,
        MOUSE_ACTIVE_DOWN
    };
    static const size_t MAX_MOUSE = 2;
    int m_MouseEmulateState[MAX_MOUSE];
    CVector2D m_MouseEmulateDownPos[MAX_MOUSE];

    // Current finger state:
    static const size_t MAX_FINGERS = 2;
    bool m_Down[MAX_FINGERS];
    CVector2D m_Pos[MAX_FINGERS];
    CVector2D m_Prev[MAX_FINGERS];


    enum
    {
        STATE_INACTIVE,
        STATE_FIRST_TOUCH,
        STATE_PANNING,
        STATE_ZOOMING
    };
    int m_State;

    double m_FirstTouchTime;
    CVector2D m_FirstTouchPos;

    CVector3D m_PanFocus;
    float m_PanDist;
};

extern CTouchInput g_TouchInput;

extern InReaction touch_input_handler(const SDL_Event_* ev);

#endif // INCLUDED_TOUCHINPUT