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Diffstat (limited to 'plugingui/notifier.h')
| -rw-r--r-- | plugingui/notifier.h | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/plugingui/notifier.h b/plugingui/notifier.h new file mode 100644 index 0000000..d68e28c --- /dev/null +++ b/plugingui/notifier.h @@ -0,0 +1,149 @@ +/* -*- 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 <iostream> +#include <functional> +#include <vector> +#include <map> +#include <set> +#include <type_traits> +#include <utility> + +namespace GUI { + +class Listener; +class NotifierBase { +public: + virtual void disconnect(Listener* object) {} +}; + +class Listener { +public: + virtual ~Listener() + { + for(auto signal = signals.begin(); signal != signals.end(); ++signal) { + (*signal)->disconnect(this); + } + } + + void registerNotifier(NotifierBase* signal) + { + signals.insert(signal); + } + + void unregisterNotifier(NotifierBase* signal) + { + signals.erase(signal); + } + + std::set<NotifierBase*> signals; +}; + +template<typename T, typename... Args> +class Notifier : public NotifierBase { +public: + Notifier() {} + ~Notifier() + { + for(auto slot = slots.begin(); slot != slots.end(); ++slot) { + (*slot).first->unregisterNotifier(this); + } + } + + void connect(Listener* object, std::function<void(T, Args...)> slot) + { + slots[object] = slot; + if(object) { + object->registerNotifier(this); + } + } + + void disconnect(Listener* object) + { + slots.erase(object); + } + + void notify(T t, Args...args) + { + for(auto slot = slots.begin(); slot != slots.end(); ++slot) { + (*slot).second(t, args...); + } + } + + std::map<Listener*, std::function<void(T, Args...)>> slots; +}; + +} // GUI:: + +template<unsigned... Is> struct seq{}; +template<unsigned I, unsigned... Is> +struct gen_seq : gen_seq<I-1, I-1, Is...>{}; +template<unsigned... Is> +struct gen_seq<0, Is...> : seq<Is...>{}; + +template<unsigned I> struct placeholder{}; + +namespace std{ +template<unsigned I> +struct is_placeholder< ::placeholder<I> > : integral_constant<int, I>{}; +} // std:: + +namespace aux{ +template<unsigned... Is, class F, class... Ts> +auto easy_bind(seq<Is...>, F&& f, Ts&&... vs) + -> decltype(std::bind(std::forward<F>(f), std::forward<Ts>(vs)..., ::placeholder<1 + Is>()...)) +{ + return std::bind(std::forward<F>(f), std::forward<Ts>(vs)..., ::placeholder<1 + Is>()...); +} +} // aux:: + +template<class R, class C, class... FArgs, class... Args> +auto mem_bind(R (C::*ptmf)(FArgs...), Args&&... vs) + -> decltype(aux::easy_bind(gen_seq<(sizeof...(FArgs) + 1) - sizeof...(Args)>(), ptmf, std::forward<Args>(vs)...)) +{ + // the +1s for 'this' argument + static_assert(sizeof...(Args) <= sizeof...(FArgs) + 1, "too many arguments to mem_bind"); + return aux::easy_bind(gen_seq<(sizeof...(FArgs) + 1) - sizeof...(Args)>(), ptmf, std::forward<Args>(vs)...); +} + +template<class T, class C, class... Args> +auto mem_bind(T C::*ptmd, Args&&... vs) + -> decltype(aux::easy_bind(gen_seq<1 - sizeof...(Args)>(), ptmd, std::forward<Args>(vs)...)) +{ + // just 'this' argument + static_assert(sizeof...(Args) <= 1, "too many arguments to mem_bind"); + return aux::easy_bind(gen_seq<1 - sizeof...(Args)>(), ptmd, std::forward<Args>(vs)...); +} + +//#define obj_connect_old(SRC, SIG, TAR, SLO) (SRC).SIG.connect(&(TAR), mem_bind(&decltype(TAR)::SLO, TAR)) + +#define fun_connect(SRC, SIG, SLO) \ + (SRC).SIG.connect(nullptr, SLO) + +#define obj_connect(SRC, SIG, TAR, SLO) \ + (SRC)->SIG.connect(TAR, mem_bind(&SLO, std::ref(*TAR))) |