💿🐜 Antkeeper source code https://antkeeper.com
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

138 lines
3.6 KiB

/*
* Copyright (C) 2020 Christopher J. Howard
*
* This file is part of Antkeeper source code.
*
* Antkeeper source code 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.
*
* Antkeeper source code 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 Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef ANTKEEPER_EVENT_DISPATCHER_HPP
#define ANTKEEPER_EVENT_DISPATCHER_HPP
#include "event.hpp"
#include "event-handler.hpp"
#include <cstdlib>
#include <list>
#include <map>
/**
* Queues events and dispatches them to event handlers.
*/
class event_dispatcher
{
public:
/// Creates an event dispatcher
event_dispatcher();
/// Destroys an event dispatcher
~event_dispatcher();
/**
* Processes all pending subscriptions and unsubscriptions, dispatches queued events, then dispatches due scheduled events.
*
* @param time The current time.
*/
void update(double time);
/**
* Subscribes an event handler to event dispatches.
*
* @param handler Handler to subscribe.
*/
template <typename T>
void subscribe(event_handler<T>* handler);
/**
* Unsubscribes an event handler from event dispatches.
*
* @param handler Handler to unsubscribe.
*/
template <typename T>
void unsubscribe(event_handler<T>* handler);
/**
* Adds an event to the queue.
*
* @param event Event to queue.
*/
void queue(const event_base& event);
/**
* Schedules an event to be dispatched at a specific time.
*
* @param event Event to schedule.
* @param time Time that the event should be dispatched.
*/
void schedule(const event_base& event, double time);
/**
* Dispatches a single event.
*
* @param event Event to dispatch.
*/
void dispatch(const event_base& event);
/**
* Dispatches all events in the queue.
*/
void flush();
/// Removes all queued and scheduled events from the queue without notifying handlers.
void clear();
private:
std::list<std::tuple<std::size_t, event_handler_base*>> to_subscribe;
std::list<std::tuple<std::size_t, event_handler_base*>> to_unsubscribe;
std::map<std::size_t, std::list<event_handler_base*>> handler_map;
std::list<event_base*> queued_events;
std::multimap<double, event_base*> scheduled_events;
};
template <typename T>
void event_dispatcher::subscribe(event_handler<T>* handler)
{
to_subscribe.push_back(std::make_tuple(handler->get_handled_event_type_id(), handler));
}
template <typename T>
void event_dispatcher::unsubscribe(event_handler<T>* handler)
{
to_unsubscribe.push_back(std::make_tuple(handler->get_handled_event_type_id(), handler));
}
inline void event_dispatcher::queue(const event_base& event)
{
queued_events.push_back(event.clone());
}
inline void event_dispatcher::schedule(const event_base& event, double time)
{
scheduled_events.insert(std::pair<double, event_base*>(time, event.clone()));
}
inline void event_dispatcher::dispatch(const event_base& event)
{
// Get list of handlers for this type of event
const std::list<event_handler_base*>& handlers = handler_map[event.get_event_type_id()];
// For each handler
for (auto handler = handlers.begin(); handler != handlers.end(); ++handler)
{
// Pass event to the handler
(*handler)->route_event(event);
}
}
#endif // ANTKEEPER_EVENT_DISPATCHER_HPP