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/* signalproxy_connectionnode.cc
*
* Copyright (C) 2002 The gtkmm Development Team
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include <glibmm/signalproxy_connectionnode.h>
#include <glibmm/object.h>
#include <utility> // std::move()
namespace Glib
{
SignalProxyConnectionNode::SignalProxyConnectionNode(const sigc::slot_base& slot, GObject* gobject)
: connection_id_(0), slot_(slot), object_(gobject)
{
// The cleanup callback will be called when the connection is disconnected.
slot_.set_parent(this, &SignalProxyConnectionNode::notify /* cleanup callback */);
}
SignalProxyConnectionNode::SignalProxyConnectionNode(sigc::slot_base&& slot, GObject* gobject)
: connection_id_(0), slot_(std::move(slot)), object_(gobject)
{
// The cleanup callback will be called when the connection is disconnected.
slot_.set_parent(this, &SignalProxyConnectionNode::notify /* cleanup callback */);
}
// notify is a message coming up from the slot to be passed back to Gtk+
// disconnect is a message coming up from the Gtk+ to be passed down to SigC++
// static
void
SignalProxyConnectionNode::notify(sigc::notifiable* data)
{
// notification from libsigc++.
SignalProxyConnectionNode* conn = static_cast<SignalProxyConnectionNode*>(data);
// If there is no object, this call was triggered from destroy_notify_handler(),
// because we set conn->object to 0 there:
if (conn && conn->object_)
{
GObject* o = conn->object_;
conn->object_ = nullptr;
// We check first, because during destruction, GTK+ sometimes seems to
// disconnect them for us, before we expect it to. See bug #87912
if (g_signal_handler_is_connected(o, conn->connection_id_))
{
// Disconnecting triggers execution of destroy_notify_handler(), eiter immediately or later:
// When the signal handler is currently running. (for instance, if the callback disconnects
// its own connection)
// In that case, destroy_notify_handler() will be called after this whole function has
// returned.
// Anyway. destroy_notify_handler() will always be called, so we leave that to do the
// deletion.
// Forget the connection:
gulong connection_id = conn->connection_id_;
conn->connection_id_ = 0;
g_signal_handler_disconnect(o, connection_id);
}
}
}
// static
void
SignalProxyConnectionNode::destroy_notify_handler(gpointer data, GClosure*)
{
// glib calls this when it has finished with a glib signal connection,
// either when the emitting object dies, or when the connection has been disconnected.
// notification from gtk+.
SignalProxyConnectionNode* conn = static_cast<SignalProxyConnectionNode*>(data);
if (conn)
{
// the object has already lost track of this object.
conn->object_ = nullptr;
// If there are connection objects referring to slot_ they are notified during
// destruction of slot_.
delete conn;
}
}
} /* namespace Glib */
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