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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* notifier.h
*
* Thu Sep 3 15:48:39 CEST 2015
* Copyright 2015 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of DrumGizmo.
*
* DrumGizmo 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.
*
* DrumGizmo 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 DrumGizmo; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#pragma once
#include <functional>
#include <vector>
#include <map>
#include <set>
#include <memory>
namespace aux
{
template<int>
struct placeholder
{
};
}
namespace std
{
template<int N>
struct is_placeholder<aux::placeholder<N>>
: integral_constant<int, N+1>
{
};
}
namespace aux
{
// std::integer_sequence introduced in C++14 so remove this once we start requiring that.
template<int... Ns>
struct int_sequence
{
};
template<int N, int... Ns>
struct gen_int_sequence
: gen_int_sequence<N-1, N-1, Ns...>
{
};
template<int... Ns>
struct gen_int_sequence<0, Ns...>
: int_sequence<Ns...>
{
};
};
namespace GUI {
class Listener;
class NotifierBase {
public:
virtual void disconnect(Listener* object) {}
};
class Listener {
public:
virtual ~Listener()
{
for(auto signal : signals)
{
signal->disconnect(this);
}
}
void registerNotifier(NotifierBase* signal)
{
signals.insert(signal);
}
void unregisterNotifier(NotifierBase* signal)
{
signals.erase(signal);
}
private:
std::set<NotifierBase*> signals;
};
template<typename... Args>
class Notifier : public NotifierBase {
public:
Notifier() {}
//! \brief When dtor is called it will automatically disconnect all its listeners.
~Notifier()
{
for(auto& slot : slots)
{
slot.first->unregisterNotifier(this);
}
}
using callback_type = std::function<void(Args...)>;
//! \brief Connect object to this Notifier.
template<typename O, typename F>
void connect(O* p, const F& fn)
{
slots[p] = std::move(construct_mem_fn(fn, p, aux::gen_int_sequence<sizeof...(Args)>{}));
if(p && dynamic_cast<Listener*>(p))
{
dynamic_cast<Listener*>(p)->registerNotifier(this);
}
}
//! \brief Disconnect object from this Notifier.
void disconnect(Listener* object)
{
slots.erase(object);
}
//! \brief Activate this notifier by pretending it is a function.
//! Example: Notifier<int> foo; foo(42);
void operator()(Args... args)
{
for(auto& slot : slots)
{
slot.second(args...);
}
}
private:
std::map<Listener*, callback_type> slots;
template<typename F, typename O, int... Ns>
callback_type construct_mem_fn(const F& fn, O* p, aux::int_sequence<Ns...>) const
{
return std::bind(fn, p, aux::placeholder<Ns>{}...);
}
};
} // GUI::
#define CONNECT(SRC, SIG, TAR, SLO) (SRC)->SIG.connect(TAR, SLO)
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