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/**
* @file input.cpp
* Handles user input received from SDL.
*
* Copyright (C) 2022 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/>.
*/
#include "input.hpp"
#include "components/EventListener.hpp"
#include "components/Script.hpp"
InputSystem::InputSystem() :
isMouseDown(false) {}
/**
* Prepares the system for running.
*/
void InputSystem::configure([[maybe_unused]] entityx::EntityManager& entities,
[[maybe_unused]] entityx::EventManager& events)
{
bindings.emplace(Binding {SDLK_a, 0}, "MoveLeft");
bindings.emplace(Binding {SDLK_d, 0}, "MoveRight");
bindings.emplace(Binding {SDLK_SPACE, 0}, "JumpKey");
}
/**
* Updates the system by checking for SDL events.
*/
void InputSystem::update(entityx::EntityManager& entities,
entityx::EventManager& events,
entityx::TimeDelta)
{
std::string listener;
for (SDL_Event event; SDL_PollEvent(&event);) {
std::function tryListener =
[&listener](entityx::Entity, EventListener& el, Scripted& s) {
el.tryListener(listener, s.caller);
};
if (event.type == SDL_KEYUP) {
if (event.key.repeat == 0) {
auto b = bindings.find({event.key.keysym.sym, event.key.keysym.mod});
if (b != bindings.end())
listener = b->second + "Released";
else
events.emit<KeyUpEvent>(event.key.keysym);
}
} else if (event.type == SDL_KEYDOWN) {
if (event.key.repeat == 0) {
auto b = bindings.find({event.key.keysym.sym, event.key.keysym.mod});
if (b != bindings.end())
listener = b->second + "Pressed";
else
events.emit<KeyDownEvent>(event.key.keysym);
}
} else if (event.type == SDL_MOUSEBUTTONDOWN) {
if (!isMouseDown) {
isMouseDown = true;
listener = "MousePressed";
tryListener =
[&listener, m = event.button]
(entityx::Entity, EventListener& el, Scripted& s) {
el.tryListener(listener, s.caller,
m.x, m.y, m.button);
};
}
} else if (event.type == SDL_MOUSEBUTTONUP) {
if (isMouseDown) {
isMouseDown = false;
listener = "MouseReleased";
tryListener =
[&listener, m = event.button]
(entityx::Entity, EventListener& el, Scripted& s) {
el.tryListener(listener, s.caller,
m.x, m.y, m.button);
};
}
}
if (!listener.empty()) {
entities.each<EventListener, Scripted>(tryListener);
listener.clear();
}
}
}
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