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150 lines
4.7 KiB
C++
150 lines
4.7 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://www.qt.io/licensing/
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**
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** This file is part of the QtCore module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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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 http://www.qt.io/terms-conditions. For further
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** information use the contact form at http://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 or version 3 as published by the Free
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** Software Foundation and appearing in the file LICENSE.LGPLv21 and
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** LICENSE.LGPLv3 included in the packaging of this file. Please review the
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** following information to ensure the GNU Lesser General Public License
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** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** As a special exception, The Qt Company gives you certain additional
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** rights. These rights are described in The Qt Company LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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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 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qobjectcleanuphandler.h"
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QT_BEGIN_NAMESPACE
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/*!
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\class QObjectCleanupHandler
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\brief The QObjectCleanupHandler class watches the lifetime of multiple QObjects.
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\ingroup objectmodel
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A QObjectCleanupHandler is useful whenever you need to know when a
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number of \l{QObject}s that are owned by someone else have been
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deleted. This is important, for example, when referencing memory
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in an application that has been allocated in a shared library.
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To keep track of some \l{QObject}s, create a
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QObjectCleanupHandler, and add() the objects you are interested
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in. If you are no longer interested in tracking a particular
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object, use remove() to remove it from the cleanup handler. If an
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object being tracked by the cleanup handler gets deleted by
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someone else it will automatically be removed from the cleanup
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handler. You can delete all the objects in the cleanup handler
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with clear(), or by destroying the cleanup handler. isEmpty()
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returns true if the QObjectCleanupHandler has no objects to keep
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track of.
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\sa QPointer
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*/
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/*!
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Constructs an empty QObjectCleanupHandler.
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*/
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QObjectCleanupHandler::QObjectCleanupHandler()
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{
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}
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/*!
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Destroys the cleanup handler. All objects in this cleanup handler
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will be deleted.
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\sa clear()
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*/
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QObjectCleanupHandler::~QObjectCleanupHandler()
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{
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clear();
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}
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/*!
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Adds \a object to this cleanup handler and returns the pointer to
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the object.
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\sa remove()
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*/
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QObject *QObjectCleanupHandler::add(QObject* object)
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{
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if (!object)
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return 0;
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connect(object, SIGNAL(destroyed(QObject*)), this, SLOT(objectDestroyed(QObject*)));
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cleanupObjects.insert(0, object);
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return object;
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}
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/*!
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Removes the \a object from this cleanup handler. The object will
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not be destroyed.
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\sa add()
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*/
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void QObjectCleanupHandler::remove(QObject *object)
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{
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int index = cleanupObjects.indexOf(object);
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if (index != -1) {
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cleanupObjects.removeAt(index);
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disconnect(object, SIGNAL(destroyed(QObject*)), this, SLOT(objectDestroyed(QObject*)));
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}
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}
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/*!
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Returns true if this cleanup handler is empty or if all objects in
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this cleanup handler have been destroyed; otherwise return false.
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\sa add() remove() clear()
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*/
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bool QObjectCleanupHandler::isEmpty() const
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{
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return cleanupObjects.isEmpty();
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}
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/*!
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Deletes all objects in this cleanup handler. The cleanup handler
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becomes empty.
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\sa isEmpty()
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*/
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void QObjectCleanupHandler::clear()
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{
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while (!cleanupObjects.isEmpty())
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delete cleanupObjects.takeFirst();
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}
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void QObjectCleanupHandler::objectDestroyed(QObject *object)
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{
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remove(object);
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}
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#include "moc_qobjectcleanuphandler.h"
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QT_END_NAMESPACE
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