event_manager.h

Go to the documentation of this file.

/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
 
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
 
You should have received a copy of the GNU Lesser 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 "mtevent.h"
#include <list>
#include <map>
 
class EventManager : public MtEventManager
{
    static void receiverReceive(MtEvent *e, void *data)
    {
        MtEventReceiver *r = (MtEventReceiver *)data;
        r->onEvent(e);
    }
    struct FuncSpec
    {
        event_receive_func f;
        void *d;
        FuncSpec(event_receive_func f, void *d) : f(f), d(d) {}
    };
 
    struct Dest
    {
        std::list<FuncSpec> funcs{};
    };
    std::map<MtEvent::Type, Dest> m_dest{};
 
public:
    ~EventManager() override = default;
 
    void put(MtEvent *e) override
    {
        std::map<MtEvent::Type, Dest>::iterator i = m_dest.find(e->getType());
        if (i != m_dest.end()) {
            std::list<FuncSpec> &funcs = i->second.funcs;
            for (FuncSpec &func : funcs) {
                (*(func.f))(e, func.d);
            }
        }
        delete e;
    }
    void reg(MtEvent::Type type, event_receive_func f, void *data) override
    {
        std::map<MtEvent::Type, Dest>::iterator i = m_dest.find(type);
        if (i != m_dest.end()) {
            i->second.funcs.emplace_back(f, data);
        } else {
            Dest dest;
            dest.funcs.emplace_back(f, data);
            m_dest[type] = dest;
        }
    }
    void dereg(MtEvent::Type type, event_receive_func f, void *data) override
    {
        auto i = m_dest.find(type);
        if (i != m_dest.end()) {
            std::list<FuncSpec> &funcs = i->second.funcs;
            for (auto j = funcs.begin(); j != funcs.end(); ) {
                bool remove = (j->f == f && (!data || j->d == data));
                if (remove)
                    j = funcs.erase(j);
                else
                    ++j;
            }
        }
    }
};