touchcontrols.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program 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 3 of the License, or
 * (at your option) any later version.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef ANDROID_TOUCHCONTROLS_H_
#define ANDROID_TOUCHCONTROLS_H_

#include "common/events.h"

class TouchControlsDrawer {
public:
    virtual void touchControlNotifyChanged() = 0;
    virtual void touchControlDraw(int16 x, int16 y, int16 w, int16 h, const Common::Rect &clip) = 0;

protected:
    ~TouchControlsDrawer() {}
};

class TouchControls {
public:
    // action type
    enum Action {
        JACTION_DOWN = 0,
        JACTION_MOVE = 1,
        JACTION_UP = 2,
        JACTION_CANCEL = 3
    };

    TouchControls();

    void init(TouchControlsDrawer *drawer, int width, int height);
    void draw();
    void update(Action action, int ptr, int x, int y);

private:
    TouchControlsDrawer *_drawer;

    int _screen_width, _screen_height;

    enum Function {
        kFunctionNone = -1,
        kFunctionJoystick = 0,
        kFunctionCenter = 1,
        kFunctionRight = 2,
        kFunctionMax = 2
    };
    Function getFunction(int x, int y);

    struct Pointer {
        Pointer() : id(-1), startX(-1), startY(-1),
            currentX(-1), currentY(-1),
            function(kFunctionNone), active(false) {}
        void reset() {
            id = -1;
            startX = startY = currentX = currentY = -1;
            function = kFunctionNone;
            active = false;
        }

        int id;
        uint16 startX, startY;
        uint16 currentX, currentY;
        Function function;
        bool active;
    };

    enum { kNumPointers = 5 };
    Pointer _pointers[kNumPointers];

    Pointer *getPointerFromId(int ptr, bool createNotFound);
    Pointer *findPointerFromFunction(Function function);

    struct FunctionState {
        FunctionState() : main(Common::JOYSTICK_BUTTON_INVALID),
            modifier(Common::JOYSTICK_BUTTON_INVALID) {}
        void reset() {
            main = Common::JOYSTICK_BUTTON_INVALID;
            modifier = Common::JOYSTICK_BUTTON_INVALID;
            clip = Common::Rect();
        }

        Common::JoystickButton main;
        Common::JoystickButton modifier;
        Common::Rect clip;
    };

    FunctionState _functionStates[kFunctionMax + 1];

    void buttonDown(Common::JoystickButton jb);
    void buttonUp(Common::JoystickButton jb);
    void buttonPress(Common::JoystickButton jb);

    /* Functions implementations */
    struct FunctionBehavior {
        void (*touchToState)(int, int, TouchControls::FunctionState &);
        bool pressOnRelease;
        float xRatio;
        float yRatio;
    };
    static FunctionBehavior functionBehaviors[TouchControls::kFunctionMax + 1];

    static void touchToJoystickState(int dX, int dY, FunctionState &state);
    static void touchToCenterState(int dX, int dY, FunctionState &state);
    static void touchToRightState(int dX, int dY, FunctionState &state);
};

#endif