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/*
* This file is part of gitg
*
* Copyright (C) 2012 - Jesse van den Kieboom
*
* gitg is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* gitg 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 gitg. If not, see <http://www.gnu.org/licenses/>.
*/
namespace Gitg
{
public class WhenMapped
{
public delegate void OnMapped();
private unowned Gtk.Widget? d_widget;
private unowned Object? d_lifetime;
private ulong d_sid;
public WhenMapped(Gtk.Widget widget)
{
d_sid = 0;
d_widget = widget;
d_widget.weak_ref(weak_notify);
}
private void weak_notify(Object o)
{
d_widget = null;
d_sid = 0;
if (d_lifetime != null)
{
d_lifetime.weak_unref(lifetime_weak_notify);
d_lifetime = null;
}
}
~WhenMapped()
{
if (d_widget != null)
{
if (d_sid != 0 && SignalHandler.is_connected(d_widget, d_sid))
{
d_widget.disconnect(d_sid);
}
d_widget.weak_unref(weak_notify);
d_widget = null;
}
if (d_lifetime != null)
{
d_lifetime.weak_unref(lifetime_weak_notify);
d_lifetime = null;
}
}
private void lifetime_weak_notify(Object o)
{
if (d_sid != 0 && d_widget != null)
{
d_widget.disconnect(d_sid);
d_sid = 0;
}
d_lifetime = null;
}
public void update(owned OnMapped mapped, Object? lifetime = null)
{
if (d_widget == null)
{
return;
}
if (d_sid != 0)
{
d_widget.disconnect(d_sid);
d_sid = 0;
}
if (d_lifetime != null)
{
d_lifetime.weak_unref(lifetime_weak_notify);
d_lifetime = null;
}
if (d_widget.get_mapped())
{
mapped();
}
else
{
d_sid = d_widget.map.connect(() => {
d_widget.disconnect(d_sid);
d_sid = 0;
if (d_lifetime != null)
{
d_lifetime.weak_unref(lifetime_weak_notify);
d_lifetime = null;
}
mapped();
});
d_lifetime = lifetime;
if (d_lifetime != null)
{
d_lifetime.weak_ref(lifetime_weak_notify);
}
}
}
}
}
// ex:ts=4 noet
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