/****************************************************************************

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

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** Contact: Nokia Corporation (qt-info@nokia.com)

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** This file is part of the QtDeclarative module of the Qt Toolkit.

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** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

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** 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

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**

** 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.

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** If you have questions regarding the use of this file, please contact

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** $QT_END_LICENSE$

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****************************************************************************/

#ifndef QDECLARATIVELAYOUTS_P_H

#define QDECLARATIVELAYOUTS_P_H

//

//  W A R N I N G

//  -------------

//

// This file is not part of the Qt API.  It exists purely as an

// implementation detail.  This header file may change from version to

// version without notice, or even be removed.

//

// We mean it.

//

#include "private/qdeclarativepositioners_p.h"

#include "private/qdeclarativeitem_p.h"

#include <qdeclarativestate_p.h>

#include <qdeclarativetransitionmanager_p_p.h>

#include <qdeclarativestateoperations_p.h>

#include <QtCore/QObject>

#include <QtCore/QString>

#include <QtCore/QTimer>

#include <QDebug>

QT_BEGIN_NAMESPACE

class QDeclarativeBasePositionerPrivate : public QDeclarativeItemPrivate, public QDeclarativeItemChangeListener

{

    Q_DECLARE_PUBLIC(QDeclarativeBasePositioner)

public:

    QDeclarativeBasePositionerPrivate()

        : spacing(0), type(QDeclarativeBasePositioner::None)

        , moveTransition(0), addTransition(0), queuedPositioning(false)

        , doingPositioning(false), anchorConflict(false)

    {

    }

    void init(QDeclarativeBasePositioner::PositionerType at)

    {

        type = at;

    }

    int spacing;

    QDeclarativeBasePositioner::PositionerType type;

    QDeclarativeTransition *moveTransition;

    QDeclarativeTransition *addTransition;

    QDeclarativeStateOperation::ActionList addActions;

    QDeclarativeStateOperation::ActionList moveActions;

    QDeclarativeTransitionManager addTransitionManager;

    QDeclarativeTransitionManager moveTransitionManager;

    void watchChanges(QDeclarativeItem *other);

    void unwatchChanges(QDeclarativeItem* other);

    bool queuedPositioning : 1;

    bool doingPositioning : 1;

    bool anchorConflict : 1;

    virtual void itemSiblingOrderChanged(QDeclarativeItem* other)

    {

        Q_Q(QDeclarativeBasePositioner);

        Q_UNUSED(other);

        if(!queuedPositioning){

            //Delay is due to many children often being reordered at once

            //And we only want to reposition them all once

            QTimer::singleShot(0,q,SLOT(prePositioning()));

            queuedPositioning = true;

        }

    }

    void itemGeometryChanged(QDeclarativeItem *, const QRectF &newGeometry, const QRectF &oldGeometry)

    {

        Q_Q(QDeclarativeBasePositioner);

        if (newGeometry.size() != oldGeometry.size())

            q->prePositioning();

    }

    virtual void itemVisibilityChanged(QDeclarativeItem *)

    {

        Q_Q(QDeclarativeBasePositioner);

        q->prePositioning();

    }

    virtual void itemOpacityChanged(QDeclarativeItem *)

    {

        Q_Q(QDeclarativeBasePositioner);

        q->prePositioning();

    }

    void itemDestroyed(QDeclarativeItem *item)

    {

        Q_Q(QDeclarativeBasePositioner);

        q->positionedItems.removeOne(QDeclarativeBasePositioner::PositionedItem(item));

    }

};

QT_END_NAMESPACE

#endif