/****************************************************************************
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** This file is part of the QtDeclarative module of the Qt Toolkit.
**
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** packaging of this file.  Please review the following information to
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****************************************************************************/

#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
