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173 lines
4.7 KiB
173 lines
4.7 KiB
13 years ago
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/****************************************************************************
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**
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** Implementation of QObjectCleanupHandler class
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**
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** Copyright (C) 2000-2008 Trolltech ASA. All rights reserved.
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**
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** This file is part of the kernel module of the Qt GUI Toolkit.
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**
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** This file may be used under the terms of the GNU General
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** Public License versions 2.0 or 3.0 as published by the Free
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** Software Foundation and appearing in the files LICENSE.GPL2
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** and LICENSE.GPL3 included in the packaging of this file.
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** Alternatively you may (at your option) use any later version
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** of the GNU General Public License if such license has been
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** publicly approved by Trolltech ASA (or its successors, if any)
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** and the KDE Free Qt Foundation.
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**
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** Please review the following information to ensure GNU General
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** Public Licensing requirements will be met:
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** http://trolltech.com/products/qt/licenses/licensing/opensource/.
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** If you are unsure which license is appropriate for your use, please
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** review the following information:
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** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
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** or contact the sales department at sales@trolltech.com.
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**
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** This file may be used under the terms of the Q Public License as
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** defined by Trolltech ASA and appearing in the file LICENSE.QPL
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** included in the packaging of this file. Licensees holding valid Qt
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** Commercial licenses may use this file in accordance with the Qt
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** Commercial License Agreement provided with the Software.
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**
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** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
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** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
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** herein.
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**
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**********************************************************************/
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#include "qobjectcleanuphandler.h"
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#include "qobjectlist.h"
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/*!
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\class QObjectCleanupHandler qobjectcleanuphandler.h
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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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Example:
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\code
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class FactoryComponent : public FactoryInterface, public QLibraryInterface
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{
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public:
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...
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QObject *createObject();
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bool init();
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void cleanup();
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bool canUnload() const;
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private:
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QObjectCleanupHandler objects;
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};
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// allocate a new object, and add it to the cleanup handler
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QObject *FactoryComponent::createObject()
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{
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return objects.add( new QObject() );
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}
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// QLibraryInterface implementation
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bool FactoryComponent::init()
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{
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return TRUE;
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}
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void FactoryComponent::cleanup()
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{
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}
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// it is only safe to unload the library when all QObject's have been destroyed
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bool FactoryComponent::canUnload() const
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{
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return objects.isEmpty();
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}
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\endcode
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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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: QObject(), cleanupObjects( 0 )
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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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*/
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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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*/
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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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if ( !cleanupObjects ) {
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cleanupObjects = new QObjectList;
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cleanupObjects->setAutoDelete( TRUE );
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}
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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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*/
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void QObjectCleanupHandler::remove( QObject *object )
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{
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if ( !cleanupObjects )
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return;
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if ( cleanupObjects->findRef( object ) >= 0 ) {
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(void) cleanupObjects->take();
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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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*/
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bool QObjectCleanupHandler::isEmpty() const
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{
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return cleanupObjects ? cleanupObjects->isEmpty() : TRUE;
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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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*/
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void QObjectCleanupHandler::clear()
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{
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delete cleanupObjects;
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cleanupObjects = 0;
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}
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void QObjectCleanupHandler::objectDestroyed( QObject*object )
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{
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if ( cleanupObjects )
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cleanupObjects->setAutoDelete( FALSE );
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remove( object );
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if ( cleanupObjects )
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cleanupObjects->setAutoDelete( TRUE );
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}
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