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