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// -*- c++ -*-
/* $Id$ */
/* 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, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <glibmm/signalproxy_connectionnode.h>
#include <glibmm/object.h>
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 */);
}
// 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(void* 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_ = 0;
if(g_signal_handler_is_connected(o, conn->connection_id_)) //We check first, because during destruction, GTK+ sometimes seems to disconnect them for us, before we expect it to. See bug #87912
{
// 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);
}
}
return 0; // apparently unused in libsigc++
}
//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_ = 0;
delete conn; // if there are connection objects referring to slot_ they are notified during destruction of slot_
}
}
} /* namespace Glib */
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