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// -*- Mode: C++; indent-tabs-mode: nil; tab-width: 2 -*-
/*
* Copyright (C) 2011-2012 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Authored by: Neil Jagdish patel <neil.patel@canonical.com>
* Marco Trevisan <marco.trevisan@canonical.com>
*/
#include "GLibSignal.h"
namespace unity
{
namespace glib
{
SignalBase::SignalBase()
: object_(nullptr),
connection_id_(0)
{}
SignalBase::~SignalBase()
{
Disconnect();
}
void SignalBase::Disconnect()
{
if (connection_id_ && G_IS_OBJECT(object_))
{
g_signal_handler_disconnect(object_, connection_id_);
g_object_remove_weak_pointer(object_, reinterpret_cast<gpointer*>(&object_));
}
object_ = nullptr;
connection_id_ = 0;
}
GObject* SignalBase::object() const
{
return object_;
}
std::string const& SignalBase::name() const
{
return name_;
}
SignalManager::SignalManager()
{}
SignalManager::~SignalManager()
{
for (auto const& signal : connections_)
{
if (G_IS_OBJECT(signal->object()))
g_object_weak_unref(signal->object(), (GWeakNotify)&OnObjectDestroyed, this);
}
}
// Ideally this would be SignalBase& but there is a specific requirment to allow
// only one instance of Signal to control a connection. With the templating, it
// was too messy to try and write a copy constructor/operator that would steal
// from "other" and make the new one the owner. Not only did it create
// opportunity for random bugs, it also made the API bad.
void SignalManager::Add(SignalBase* signal)
{
Add(SignalBase::Ptr(signal));
}
void SignalManager::Add(SignalBase::Ptr const& signal)
{
connections_.push_back(signal);
g_object_weak_ref(signal->object(), (GWeakNotify)&OnObjectDestroyed, this);
}
void SignalManager::OnObjectDestroyed(SignalManager* self, GObject* old_obj)
{
for (auto it = self->connections_.begin(); it != self->connections_.end();)
{
auto const& signal = *it;
// When an object has been destroyed, the signal member is nullified,
// so at this point we can be sure that removing signal with a null object,
// means removing invalid signals.
if (!signal->object())
{
it = self->connections_.erase(it);
}
else
{
++it;
}
}
}
// This uses void* to keep in line with the g_signal* functions
// (it allows you to pass in a GObject without casting up).
void SignalManager::Disconnect(void* object, std::string const& signal_name)
{
bool all_signals = signal_name.empty();
for (auto it = connections_.begin(); it != connections_.end();)
{
auto const& signal = *it;
if (signal->object() == object && (all_signals || signal->name() == signal_name))
{
g_object_weak_unref(signal->object(), (GWeakNotify)&OnObjectDestroyed, this);
it = connections_.erase(it);
}
else
{
++it;
}
}
}
}
}
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