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/* BEGIN_COMMON_COPYRIGHT_HEADER
* (c)LGPL2+
*
* LXQt - a lightweight, Qt based, desktop toolset
* https://lxqt.org
*
* Copyright: 2015 LXQt team
* Authors:
* Palo Kisa <palo.kisa@gmail.com>
*
* This program or 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., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*
* END_COMMON_COPYRIGHT_HEADER */
#include "windownotifier.h"
#include <QWidget>
#include <QEvent>
void WindowNotifier::observeWindow(QWidget * w)
{
//installing the same filter object multiple times doesn't harm
w->installEventFilter(this);
}
bool WindowNotifier::eventFilter(QObject * watched, QEvent * event)
{
QWidget * widget = qobject_cast<QWidget *>(watched); //we're observing only QWidgetw
auto it = std::lower_bound(mShownWindows.begin(), mShownWindows.end(), widget);
switch (event->type())
{
case QEvent::Close:
watched->removeEventFilter(this);
#if __cplusplus >= 201703L
[[fallthrough]];
#endif
// fall through
case QEvent::Hide:
if (mShownWindows.end() != it)
mShownWindows.erase(it);
if (mShownWindows.isEmpty())
emit lastHidden();
break;
case QEvent::Show:
{
const bool first_shown = mShownWindows.isEmpty();
mShownWindows.insert(it, widget); //we keep the mShownWindows sorted
if (first_shown)
emit firstShown();
}
default:
break;
}
return false;
}
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