95 lines
3.3 KiB
C++
95 lines
3.3 KiB
C++
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// -*- c++ -*-
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/* $Id: signalproxy_connectionnode.cc,v 1.6 2004/10/07 16:02:01 philipl Exp $ */
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/* signalproxy_connectionnode.cc
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*
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* Copyright (C) 2002 The gtkmm Development Team
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <glibmm/signalproxy_connectionnode.h>
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#include <glibmm/object.h>
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namespace Glib
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{
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SignalProxyConnectionNode::SignalProxyConnectionNode(const sigc::slot_base& slot, GObject* gobject)
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:
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connection_id_ (0),
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slot_ (slot),
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object_ (gobject)
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{
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//The cleanup callback will be called when the connection is disconnected.
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slot_.set_parent(this, &SignalProxyConnectionNode::notify /* cleanup callback */);
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}
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// notify is a message coming up from the slot to be passed back to Gtk+
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// disconnect is a message coming up from the Gtk+ to be passed down to SigC++
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//static
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void* SignalProxyConnectionNode::notify(void* data)
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{
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// notification from libsigc++.
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SignalProxyConnectionNode* conn = static_cast<SignalProxyConnectionNode*>(data);
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// If there is no object, this call was triggered from destroy_notify_handler(),
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// because we set conn->object to 0 there:
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if(conn && conn->object_)
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{
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GObject* o = conn->object_;
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conn->object_ = 0;
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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
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{
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// Disconnecting triggers execution of destroy_notify_handler(), eiter immediately or later:
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// When the signal handler is currently running. (for instance, if the callback disconnects its own connection)
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// In that case, destroy_notify_handler() will be called after this whole function has returned.
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// Anyway. destroy_notify_handler() will always be called, so we leave that to do the deletion.
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//Forget the connection:
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gulong connection_id = conn->connection_id_;
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conn->connection_id_ = 0;
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g_signal_handler_disconnect(o, connection_id);
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}
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}
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return 0; // apparently unused in libsigc++
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}
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//static
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void SignalProxyConnectionNode::destroy_notify_handler(gpointer data, GClosure*)
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{
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//glib calls this when it has finished with a glib signal connection,
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//either when the emitting object dies, or when the connection has been disconnected.
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// notification from gtk+.
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SignalProxyConnectionNode* conn = static_cast<SignalProxyConnectionNode*>(data);
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if(conn)
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{
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// the object has already lost track of this object.
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conn->object_ = 0;
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delete conn; // if there are connection objects referring to slot_ they are notified during destruction of slot_
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}
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}
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} /* namespace Glib */
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