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/**
* @file window.hpp
* Handles user input received from SDL.
*
* 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_INPUT_HPP_
#define SYSTEM_INPUT_HPP_
#include <entityx/entityx.h>
#include <SDL2/SDL.h>
/**
* @class KeyUpEvent
* Stores info regarding key releases.
*/
struct KeyUpEvent
{
SDL_Keycode sym;
Uint16 mod;
KeyUpEvent(const SDL_Keysym& keysym) :
sym(keysym.sym), mod(keysym.mod) {}
};
/**
* @class KeyDownEvent
* Stores info regarding key presses.
*/
struct KeyDownEvent {
SDL_Keycode sym;
Uint16 mod;
KeyDownEvent(const SDL_Keysym& keysym) :
sym(keysym.sym), mod(keysym.mod) {}
};
/**
* @class InputSystem
* Listens for user input from SDL, and emits input events accordingly.
*/
class InputSystem : public entityx::System<InputSystem>
{
public:
/**
* Prepares the system for running.
*/
void configure([[maybe_unused]] entityx::EntityManager& entities,
[[maybe_unused]] entityx::EventManager& events) final {}
/**
* Updates the system by checking for SDL events.
*/
void update([[maybe_unused]] entityx::EntityManager& entities,
[[maybe_unused]] entityx::EventManager& events,
[[maybe_unused]] entityx::TimeDelta dt) final
{
for (SDL_Event event; SDL_PollEvent(&event);) {
switch (event.type) {
case SDL_KEYUP:
if (auto key = event.key; key.repeat == 0)
events.emit<KeyUpEvent>(key.keysym);
break;
case SDL_KEYDOWN:
if (auto key = event.key; key.repeat == 0)
events.emit<KeyDownEvent>(key.keysym);
break;
default:
break;
}
}
}
};
#endif // SYSTEM_INPUT_HPP_
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