obs-StreamFX/source/util-event.hpp
2019-01-23 20:02:50 +01:00

112 lines
2.5 KiB
C++

/*
* Modern effects for a modern Streamer
* Copyright (C) 2017 Michael Fabian Dirks
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#pragma once
#include <functional>
#include <list>
namespace util {
template<typename... _args>
class event {
std::list<std::function<void(_args...)>> listeners;
std::function<void()> listen_cb;
std::function<void()> silence_cb;
public /* functions */:
// Add new listener.
inline void add(std::function<void(_args...)> listener)
{
if (listeners.size() == 0) {
if (listen_cb) {
listen_cb();
}
}
listeners.push_back(listener);
}
// Remove existing listener.
inline void remove(std::function<void(_args...)> listener)
{
listeners.remove(listener);
if (listeners.size() == 0) {
if (silence_cb) {
silence_cb();
}
}
}
// Check if empty / no listeners.
inline bool empty()
{
return listeners.empty();
}
// Remove all listeners.
inline void clear()
{
listeners.clear();
if (silence_cb) {
silence_cb();
}
}
public /* operators */:
// Call Listeners with arguments.
/// Not valid without the extra template.
template<typename... _largs>
inline void operator()(_args... args)
{
for (auto& l : listeners) {
l(args...);
}
}
// Convert to bool (true if not empty, false if empty).
inline operator bool()
{
return !this->empty();
}
// Add new listener.
inline event<_args...>& operator+=(std::function<void(_args...)> listener)
{
this->add(listener);
return *this;
}
// Remove existing listener.
inline event<_args...>& operator-=(std::function<void(_args...)> listener)
{
this->remove(listener);
return *this;
}
public /* events */:
void set_listen_callback(std::function<void()> cb)
{
this->listen_cb = cb;
}
void set_silence_callback(std::function<void()> cb)
{
this->silence_cb = cb;
}
};
} // namespace util