3 /* $Id: signalproxy_connectionnode.cc 137 2004-10-07 16:02:01Z philipl $ */
5 /* signalproxy_connectionnode.cc
7 * Copyright (C) 2002 The gtkmm Development Team
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Library General Public
11 * License as published by the Free Software Foundation; either
12 * version 2 of the License, or (at your option) any later version.
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Library General Public License for more details.
19 * You should have received a copy of the GNU Library General Public
20 * License along with this library; if not, write to the Free
21 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #include <glibmm/signalproxy_connectionnode.h>
25 #include <glibmm/object.h>
31 SignalProxyConnectionNode::SignalProxyConnectionNode(const sigc::slot_base& slot, GObject* gobject)
37 //The cleanup callback will be called when the connection is disconnected.
38 slot_.set_parent(this, &SignalProxyConnectionNode::notify /* cleanup callback */);
41 // notify is a message coming up from the slot to be passed back to Gtk+
42 // disconnect is a message coming up from the Gtk+ to be passed down to SigC++
44 void* SignalProxyConnectionNode::notify(void* data)
46 // notification from libsigc++.
47 SignalProxyConnectionNode* conn = static_cast<SignalProxyConnectionNode*>(data);
49 // If there is no object, this call was triggered from destroy_notify_handler(),
50 // because we set conn->object to 0 there:
51 if(conn && conn->object_)
53 GObject* o = conn->object_;
56 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
58 // Disconnecting triggers execution of destroy_notify_handler(), eiter immediately or later:
59 // When the signal handler is currently running. (for instance, if the callback disconnects its own connection)
60 // In that case, destroy_notify_handler() will be called after this whole function has returned.
61 // Anyway. destroy_notify_handler() will always be called, so we leave that to do the deletion.
64 //Forget the connection:
65 gulong connection_id = conn->connection_id_;
66 conn->connection_id_ = 0;
68 g_signal_handler_disconnect(o, connection_id);
72 return 0; // apparently unused in libsigc++
76 void SignalProxyConnectionNode::destroy_notify_handler(gpointer data, GClosure*)
78 //glib calls this when it has finished with a glib signal connection,
79 //either when the emitting object dies, or when the connection has been disconnected.
81 // notification from gtk+.
82 SignalProxyConnectionNode* conn = static_cast<SignalProxyConnectionNode*>(data);
86 // the object has already lost track of this object.
89 delete conn; // if there are connection objects referring to slot_ they are notified during destruction of slot_
93 } /* namespace Glib */