event_manager.h

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// Luanti
// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
 
#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;
                        }
                }
        }
};