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

**

** Copyright (C) 2010 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.

**

** $QT_BEGIN_LICENSE:LGPL$

** 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

** Alternatively, 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.

**

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

** Nokia at qt-info@nokia.com.

**

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** $QT_END_LICENSE$

**

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

#ifndef QDECLARATIVELAYOUTS_H

#define QDECLARATIVELAYOUTS_H

#include "qdeclarativeitem.h"

#include <private/qdeclarativestate_p.h>

#include <private/qpodvector_p.h>

#include <QtCore/QObject>

#include <QtCore/QString>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Declarative)

class QDeclarativeBasePositionerPrivate;

class Q_DECLARATIVE_EXPORT QDeclarativeBasePositioner : public QDeclarativeItem

{

    Q_OBJECT

    Q_PROPERTY(int spacing READ spacing WRITE setSpacing NOTIFY spacingChanged)

    Q_PROPERTY(QDeclarativeTransition *move READ move WRITE setMove NOTIFY moveChanged)

    Q_PROPERTY(QDeclarativeTransition *add READ add WRITE setAdd NOTIFY addChanged)

public:

    enum PositionerType { None = 0x0, Horizontal = 0x1, Vertical = 0x2, Both = 0x3 };

    QDeclarativeBasePositioner(PositionerType, QDeclarativeItem *parent);

    ~QDeclarativeBasePositioner();

    int spacing() const;

    void setSpacing(int);

    QDeclarativeTransition *move() const;

    void setMove(QDeclarativeTransition *);

    QDeclarativeTransition *add() const;

    void setAdd(QDeclarativeTransition *);

protected:

    QDeclarativeBasePositioner(QDeclarativeBasePositionerPrivate &dd, PositionerType at, QDeclarativeItem *parent);

    virtual void componentComplete();

    virtual QVariant itemChange(GraphicsItemChange, const QVariant &);

    void finishApplyTransitions();

Q_SIGNALS:

    void spacingChanged();

    void moveChanged();

    void addChanged();

protected Q_SLOTS:

    void prePositioning();

protected:

    virtual void doPositioning(QSizeF *contentSize)=0;

    virtual void reportConflictingAnchors()=0;

    struct PositionedItem {

        PositionedItem(QDeclarativeItem *i) : item(i), isNew(false), isVisible(true) {}

        bool operator==(const PositionedItem &other) const { return other.item == item; }

        QDeclarativeItem *item;

        bool isNew;

        bool isVisible;

    };

    QPODVector<PositionedItem,8> positionedItems;

    void positionX(int,const PositionedItem &target);

    void positionY(int,const PositionedItem &target);

private:

    Q_DISABLE_COPY(QDeclarativeBasePositioner)

    Q_DECLARE_PRIVATE_D(QGraphicsItem::d_ptr.data(), QDeclarativeBasePositioner)

};

class Q_DECLARATIVE_EXPORT QDeclarativeColumn : public QDeclarativeBasePositioner

{

    Q_OBJECT

public:

    QDeclarativeColumn(QDeclarativeItem *parent=0);

protected:

    virtual void doPositioning(QSizeF *contentSize);

    virtual void reportConflictingAnchors();

private:

    Q_DISABLE_COPY(QDeclarativeColumn)

};

class Q_DECLARATIVE_EXPORT QDeclarativeRow: public QDeclarativeBasePositioner

{

    Q_OBJECT

public:

    QDeclarativeRow(QDeclarativeItem *parent=0);

protected:

    virtual void doPositioning(QSizeF *contentSize);

    virtual void reportConflictingAnchors();

private:

    Q_DISABLE_COPY(QDeclarativeRow)

};

class Q_DECLARATIVE_EXPORT QDeclarativeGrid : public QDeclarativeBasePositioner

{

    Q_OBJECT

    Q_PROPERTY(int rows READ rows WRITE setRows NOTIFY rowsChanged)

    Q_PROPERTY(int columns READ columns WRITE setColumns NOTIFY columnsChanged)

    Q_PROPERTY(Flow flow READ flow WRITE setFlow NOTIFY flowChanged)

public:

    QDeclarativeGrid(QDeclarativeItem *parent=0);

    int rows() const {return m_rows;}

    void setRows(const int rows);

    int columns() const {return m_columns;}

    void setColumns(const int columns);

    Q_ENUMS(Flow)

    enum Flow { LeftToRight, TopToBottom };

    Flow flow() const;

    void setFlow(Flow);

Q_SIGNALS:

    void rowsChanged();

    void columnsChanged();

    void flowChanged();

protected:

    virtual void doPositioning(QSizeF *contentSize);

    virtual void reportConflictingAnchors();

private:

    int m_rows;

    int m_columns;

    Flow m_flow;

    Q_DISABLE_COPY(QDeclarativeGrid)

};

class QDeclarativeFlowPrivate;

class Q_DECLARATIVE_EXPORT QDeclarativeFlow: public QDeclarativeBasePositioner

{

    Q_OBJECT

    Q_PROPERTY(Flow flow READ flow WRITE setFlow NOTIFY flowChanged)

public:

    QDeclarativeFlow(QDeclarativeItem *parent=0);

    Q_ENUMS(Flow)

    enum Flow { LeftToRight, TopToBottom };

    Flow flow() const;

    void setFlow(Flow);

Q_SIGNALS:

    void flowChanged();

protected:

    virtual void doPositioning(QSizeF *contentSize);

    virtual void reportConflictingAnchors();

protected:

    QDeclarativeFlow(QDeclarativeFlowPrivate &dd, QDeclarativeItem *parent);

private:

    Q_DISABLE_COPY(QDeclarativeFlow)

    Q_DECLARE_PRIVATE_D(QGraphicsItem::d_ptr.data(), QDeclarativeFlow)

};

QT_END_NAMESPACE

QML_DECLARE_TYPE(QDeclarativeColumn)

QML_DECLARE_TYPE(QDeclarativeRow)

QML_DECLARE_TYPE(QDeclarativeGrid)

QML_DECLARE_TYPE(QDeclarativeFlow)

QT_END_HEADER

#endif