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/**
* @file window.hpp
* Handles key press for exiting the game.
*
* Copyright (C) 2019 Clyne Sullivan
*
* 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 <https://www.gnu.org/licenses/>.
*/
#ifndef SYSTEM_GAMERUN_HPP_
#define SYSTEM_GAMERUN_HPP_
#include "input.hpp"
#include <entityx/entityx.h>
#include <atomic>
#include <iostream>
/**
* @class GameRunSystem
* Listens for a key event to tell the game to exit.
*/
class GameRunSystem : public entityx::System<GameRunSystem>,
public entityx::Receiver<GameRunSystem>
{
private:
std::atomic_bool shouldRunFlag;
public:
/**
* Configures the system to wait for the exit event.
*/
void configure([[maybe_unused]] entityx::EntityManager& entities,
entityx::EventManager& events)
{
shouldRunFlag.store(true);
events.subscribe<KeyUpEvent>(*this);
std::cout << "Press escape to exit." << std::endl;
}
// Unused
void update([[maybe_unused]] entityx::EntityManager& entities,
[[maybe_unused]] entityx::EventManager& events,
[[maybe_unused]] entityx::TimeDelta dt) final {}
/**
* Receiver for key release events, used to listen for game exit key.
*/
void receive(const KeyUpEvent& kue)
{
if (kue.sym == SDLK_ESCAPE)
shouldRunFlag.store(false);
}
/**
* Checks if the game exit key has been pressed.
* @return True if the game should exit
*/
bool shouldRun(void) const
{
return shouldRunFlag.load();
}
};
#endif // SYSTEM_GAMERUN_HPP_
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