events.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 CHEWY_EVENTS_H
#define CHEWY_EVENTS_H

#include "common/events.h"
#include "common/queue.h"
#include "graphics/screen.h"

namespace Chewy {

struct KbdInfo {
    char _keyCode = '\0';
    int _scanCode = Common::KEYCODE_INVALID;
};

typedef void (*TimerProc)();

class EventsManager {
    struct TimerRecord {
        TimerProc _proc;
        uint32 _interval;
        uint32 _nextFrameTime;
        TimerRecord(TimerProc proc, uint32 interval) : _proc(proc), _interval(interval), _nextFrameTime(0) {
        }
    };
    typedef Common::List<TimerRecord> TimerList;

private:
    void init_timer_handler();
    static void timer_handler();

    void handleMouseEvent(const Common::Event &event);
    void handleKbdEvent(const Common::Event &event);

    TimerList _timers;
    Common::Queue<Common::Event> _pendingEvents;
    Common::Queue<Common::Event> _pendingKeyEvents;
    int16 _hotkey = Common::KEYCODE_INVALID;

    void checkTimers();

    static void updateScreen();

    void addTimer(TimerProc proc, uint interval) {
        _timers.push_back(TimerRecord(proc, interval));
    }

    void processEvents();

    void handleEvent(const Common::Event &event);

public:
    KbdInfo _kbInfo;
    Common::Point _mousePos;
    bool _flag1 = false;
    bool _flag2 = false;

    EventsManager(Graphics::Screen *screen, uint refreshRate = 1000 / 50);
    virtual ~EventsManager();

    void delay(size_t time);

    Graphics::Screen *_screen;

    void update();

    bool keyEventPending() {
        processEvents();
        return !_pendingKeyEvents.empty();
    }

    bool eventPending() {
        processEvents();
        return !_pendingEvents.empty();
    }

    Common::Event getPendingKeyEvent() {
        processEvents();
        return _pendingKeyEvents.empty() ? Common::Event() : _pendingKeyEvents.pop();
    }

    Common::Event getPendingEvent() {
        processEvents();
        return _pendingEvents.empty() ? Common::Event() : _pendingEvents.pop();
    }

    void warpMouse(const Common::Point &newPos);

    void clearEvents();

    void setHotKey(Common::KeyCode key) { _hotkey = key; }
    int16 getSwitchCode();
};

extern EventsManager *g_events;

extern void delay(size_t time);

extern bool kbhit();
extern char getch();

#define EVENTS_UPDATE g_events->update()
#define EVENTS_CLEAR g_events->clearEvents()
#define ALT 0x1000

} // namespace Chewy

#endif