Import relevant source from Qt 4.8

Change-Id: I5078db4081d95290c54f39d3c0efc2fc2f62e6a6

1 files changed, 87 insertions, 0 deletions

diff --git a/src/declarative/qml/qdeclarativecleanup.cpp b/src/declarative/qml/qdeclarativecleanup.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtDeclarative module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "private/qdeclarativecleanup_p.h"
+
+#include "private/qdeclarativeengine_p.h"
+
+QT_BEGIN_NAMESPACE
+
+/*!
+\internal
+\class QDeclarativeCleanup
+\brief The QDeclarativeCleanup provides a callback when a QDeclarativeEngine is deleted. 
+
+Any object that needs cleanup to occur before the QDeclarativeEngine's QScriptEngine is
+destroyed should inherit from QDeclarativeCleanup.  The clear() virtual method will be
+called by QDeclarativeEngine just before it deletes the QScriptEngine.
+*/
+
+/*!
+\internal
+
+Create a QDeclarativeCleanup for \a engine
+*/
+QDeclarativeCleanup::QDeclarativeCleanup(QDeclarativeEngine *engine)
+: prev(0), next(0)
+{
+    if (!engine)
+        return;
+
+    QDeclarativeEnginePrivate *p = QDeclarativeEnginePrivate::get(engine);
+
+    if (p->cleanup) next = p->cleanup;
+    p->cleanup = this;
+    prev = &p->cleanup;
+    if (next) next->prev = &next;
+}
+
+/*!
+\internal
+*/
+QDeclarativeCleanup::~QDeclarativeCleanup()
+{
+    if (prev) *prev = next;
+    if (next) next->prev = prev;
+    prev = 0; 
+    next = 0;
+}
+QT_END_NAMESPACE