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"

namespace Graphics {
class ManagedSurface;
}

class TouchControlsDrawer {
public:
    virtual void touchControlInitSurface(const Graphics::ManagedSurface &surf) = 0;
    virtual void touchControlNotifyChanged() = 0;
    virtual void touchControlDraw(uint8 alpha, 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();
    ~TouchControls();

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

private:
    TouchControlsDrawer *_drawer;

    unsigned int _screen_width, _screen_height;
    unsigned int _scale, _scale2;

    Graphics::ManagedSurface *_svg;

    unsigned int _zombieCount;

    enum State {
        kFunctionInactive = 0,
        kFunctionActive = 1,
        kFunctionZombie = 2
    };

    struct Function {
        virtual bool isInside(int, int) = 0;
        virtual void touch(int, int, Action) = 0;
        virtual void draw(uint8 alpha) = 0;
        virtual void resetState() {}

        Function(const TouchControls *parent_) :
            parent(parent_), pointerId(-1),
            startX(-1), startY(-1),
            currentX(-1), currentY(-1),
            lastActivable(0), status(kFunctionInactive) {}
        virtual ~Function() {}

        void reset() {
            pointerId = -1;
            startX = startY = currentX = currentY = -1;
            lastActivable = 0;
            status = kFunctionInactive;
            resetState();
        }

        const TouchControls *parent;

        int pointerId;
        uint16 startX, startY;
        uint16 currentX, currentY;
        uint32 lastActivable;
        State status;
    };
    Function *getFunctionFromPointerId(int ptr);
    Function *getZombieFunctionFromPos(int x, int y);

    enum FunctionId {
        kFunctionNone = -1,
        kFunctionLeft = 0,
        kFunctionRight = 1,
        kFunctionCenter = 2,
        kFunctionCount = 3
    };
    FunctionId getFunctionId(int x, int y);

    Function *_functions[kFunctionCount];

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

    void drawSurface(uint8 alpha, int x, int y, int offX, int offY, const Common::Rect &clip) const;


    // Functions implementations
    struct FunctionLeft : Function {
        FunctionLeft(const TouchControls *parent) :
            Function(parent), mask(0) {}
        void resetState() override { mask = 0; }

        bool isInside(int, int) override;
        void touch(int, int, Action) override;
        void draw(uint8 alpha) override;

        uint32 mask;
        void maskToLeftButtons(uint32 oldMask, uint32 newMask);
    };

    struct FunctionRight : Function {
        FunctionRight(const TouchControls *parent) :
            Function(parent), button(0) {}
        void resetState() override { button = 0; }

        bool isInside(int, int) override;
        void touch(int, int, Action) override;
        void draw(uint8 alpha) override;

        uint32 button;
    };

    struct FunctionCenter : Function {
        FunctionCenter(const TouchControls *parent) :
            Function(parent), button(0) {}
        void resetState() override { button = 0; }

        bool isInside(int, int) override;
        void touch(int, int, Action) override;
        void draw(uint8 alpha) override;

        uint32 button;
    };
};

#endif