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66 lines
2.1 KiB
66 lines
2.1 KiB
/* BEGIN_COMMON_COPYRIGHT_HEADER
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* (c)LGPL2+
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*
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* LXQt - a lightweight, Qt based, desktop toolset
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* http://lxqt.org
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*
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* Copyright: 2015 LXQt team
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* Authors:
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* Palo Kisa <palo.kisa@gmail.com>
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*
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* This program or library is free software; you can redistribute it
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* and/or modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 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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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA
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*
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* END_COMMON_COPYRIGHT_HEADER */
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#include "windownotifier.h"
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#include <QWidget>
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#include <QEvent>
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void WindowNotifier::observeWindow(QWidget * w)
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{
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//installing the same filter object multiple times doesn't harm
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w->installEventFilter(this);
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}
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bool WindowNotifier::eventFilter(QObject * watched, QEvent * event)
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{
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QWidget * widget = qobject_cast<QWidget *>(watched); //we're observing only QWidgetw
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auto it = std::lower_bound(mShownWindows.begin(), mShownWindows.end(), widget);
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switch (event->type())
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{
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case QEvent::Close:
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watched->removeEventFilter(this);
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//no break
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case QEvent::Hide:
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Q_ASSERT(mShownWindows.end() != it);
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mShownWindows.erase(it);
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if (mShownWindows.isEmpty())
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emit lastHidden();
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break;
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case QEvent::Show:
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{
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const bool first_shown = mShownWindows.isEmpty();
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mShownWindows.insert(it, widget); //we keep the mShownWindows sorted
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if (first_shown)
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emit firstShown();
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}
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default:
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break;
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}
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return false;
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}
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