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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)