forked from qt-creator/qt-creator
c225216b93
Tracks application state, and signals when it is changed. Supports forcing blocked state with reference counting. Change-Id: Ic173d42446b1b08bd4a1e7c1acf38c68644d30b3 Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io> Reviewed-by: Eike Ziller <eike.ziller@qt.io>
71 lines
2.2 KiB
C++
71 lines
2.2 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2019 Orgad Shaneh <orgads@gmail.com>
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of Qt Creator.
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**
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3 as published by the Free Software
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** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-3.0.html.
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**
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****************************************************************************/
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#include "globalfilechangeblocker.h"
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#include "qtcassert.h"
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#include <QApplication>
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namespace Utils {
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GlobalFileChangeBlocker::GlobalFileChangeBlocker()
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{
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m_blockedState = QApplication::applicationState() != Qt::ApplicationActive;
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qApp->installEventFilter(this);
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}
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GlobalFileChangeBlocker *GlobalFileChangeBlocker::instance()
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{
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static GlobalFileChangeBlocker blocker;
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return &blocker;
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}
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void GlobalFileChangeBlocker::forceBlocked(bool blocked)
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{
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if (blocked)
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++m_forceBlocked;
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else if (QTC_GUARD(m_forceBlocked > 0))
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--m_forceBlocked;
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emitIfChanged();
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}
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bool GlobalFileChangeBlocker::eventFilter(QObject *obj, QEvent *e)
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{
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if (obj == qApp && e->type() == QEvent::ApplicationStateChange)
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emitIfChanged();
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return false;
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}
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void GlobalFileChangeBlocker::emitIfChanged()
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{
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const bool blocked = m_forceBlocked || (QApplication::applicationState() != Qt::ApplicationActive);
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if (blocked != m_blockedState) {
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emit stateChanged(blocked);
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m_blockedState = blocked;
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}
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}
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} // namespace Utils
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