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Diffstat (limited to 'tqtinterface/qt4/src/kernel/tqobjectcleanuphandler.cpp')
| -rw-r--r-- | tqtinterface/qt4/src/kernel/tqobjectcleanuphandler.cpp | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/tqtinterface/qt4/src/kernel/tqobjectcleanuphandler.cpp b/tqtinterface/qt4/src/kernel/tqobjectcleanuphandler.cpp new file mode 100644 index 0000000..fdee282 --- /dev/null +++ b/tqtinterface/qt4/src/kernel/tqobjectcleanuphandler.cpp @@ -0,0 +1,172 @@ +/**************************************************************************** +** +** Implementation of TQObjectCleanupHandler class +** +** Copyright (C) 2000-2008 Trolltech ASA. All rights reserved. +** +** This file is part of the kernel module of the TQt GUI Toolkit. +** +** This file may be used under the terms of the GNU General +** Public License versions 2.0 or 3.0 as published by the Free +** Software Foundation and appearing in the files LICENSE.GPL2 +** and LICENSE.GPL3 included in the packaging of this file. +** Alternatively you may (at your option) use any later version +** of the GNU General Public License if such license has been +** publicly approved by Trolltech ASA (or its successors, if any) +** and the KDE Free TQt Foundation. +** +** Please review the following information to ensure GNU General +** Public Licensing requirements will be met: +** http://trolltech.com/products/qt/licenses/licensing/opensource/. +** If you are unsure which license is appropriate for your use, please +** review the following information: +** http://trolltech.com/products/qt/licenses/licensing/licensingoverview +** or contact the sales department at sales@trolltech.com. +** +** This file may be used under the terms of the Q Public License as +** defined by Trolltech ASA and appearing in the file LICENSE.TQPL +** included in the packaging of this file. Licensees holding valid TQt +** Commercial licenses may use this file in accordance with the TQt +** Commercial License Agreement provided with the Software. +** +** This file is provided "AS IS" with NO WARRANTY OF ANY KIND, +** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted +** herein. +** +**********************************************************************/ + +#include "tqobjectcleanuphandler.h" +#include "tqobjectlist.h" + +/*! + \class TQObjectCleanupHandler tqobjectcleanuphandler.h + \brief The TQObjectCleanupHandler class watches the lifetime of multiple TQObjects. + + \ingroup objectmodel + + A TQObjectCleanupHandler is useful whenever you need to know when a + number of \l{TQObject}s that are owned by someone else have been + deleted. This is important, for example, when referencing memory + in an application that has been allocated in a shared library. + + Example: + + \code + class FactoryComponent : public FactoryInterface, public TQLibraryInterface + { + public: + ... + + TQObject *createObject(); + + bool init(); + void cleanup(); + bool canUnload() const; + + private: + TQObjectCleanupHandler objects; + }; + + // allocate a new object, and add it to the cleanup handler + TQObject *FactoryComponent::createObject() + { + return objects.add( new TQObject() ); + } + + // TQLibraryInterface implementation + bool FactoryComponent::init() + { + return TRUE; + } + + void FactoryComponent::cleanup() + { + } + + // it is only safe to unload the library when all TQObject's have been destroyed + bool FactoryComponent::canUnload() const + { + return objects.isEmpty(); + } + \endcode +*/ + +/*! + Constructs an empty TQObjectCleanupHandler. +*/ +TQObjectCleanupHandler::TQObjectCleanupHandler() +: TQObject(), cleanupObjects( 0 ) +{ +} + +/*! + Destroys the cleanup handler. All objects in this cleanup handler + will be deleted. +*/ +TQObjectCleanupHandler::~TQObjectCleanupHandler() +{ + clear(); +} + +/*! + Adds \a object to this cleanup handler and returns the pointer to + the object. +*/ +TQObject* TQObjectCleanupHandler::add( TQObject* object ) +{ + if ( !object ) + return 0; + + if ( !cleanupObjects ) { + cleanupObjects = new TQObjectList; + cleanupObjects->setAutoDelete( TRUE ); + } + connect( object, TQT_SIGNAL(destroyed(TQObject*)), this, TQT_SLOT(objectDestroyed(TQObject*)) ); + cleanupObjects->insert( 0, object ); + return object; +} + +/*! + Removes the \a object from this cleanup handler. The object will + not be destroyed. +*/ +void TQObjectCleanupHandler::remove( TQObject *object ) +{ + if ( !cleanupObjects ) + return; + if ( cleanupObjects->tqfindRef( object ) >= 0 ) { + (void) cleanupObjects->take(); + disconnect( object, TQT_SIGNAL(destroyed(TQObject*)), this, TQT_SLOT(objectDestroyed(TQObject*)) ); + } +} + +/*! + Returns TRUE if this cleanup handler is empty or if all objects in + this cleanup handler have been destroyed; otherwise return FALSE. +*/ +bool TQObjectCleanupHandler::isEmpty() const +{ + return cleanupObjects ? cleanupObjects->isEmpty() : TRUE; +} + +/*! + Deletes all objects in this cleanup handler. The cleanup handler + becomes empty. +*/ +void TQObjectCleanupHandler::clear() +{ + delete cleanupObjects; + cleanupObjects = 0; +} + +void TQObjectCleanupHandler::objectDestroyed( TQObject*object ) +{ + if ( cleanupObjects ) + cleanupObjects->setAutoDelete( FALSE ); + + remove( object ); + + if ( cleanupObjects ) + cleanupObjects->setAutoDelete( TRUE ); +} |