/****************************************************************************
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** this package.
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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
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****************************************************************************/

#ifndef QMLGRAPHICSLAYOUTS_H
#define QMLGRAPHICSLAYOUTS_H

#include "qmlgraphicsitem.h"

#include "../util/qmlstate_p.h"
#include <private/qpodvector_p.h>

#include <QtCore/QObject>
#include <QtCore/QString>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Declarative)
class QmlGraphicsBasePositionerPrivate;

class Q_DECLARATIVE_EXPORT QmlGraphicsBasePositioner : public QmlGraphicsItem
{
    Q_OBJECT

    Q_PROPERTY(int spacing READ spacing WRITE setSpacing NOTIFY spacingChanged)
    Q_PROPERTY(QmlTransition *move READ move WRITE setMove)
    Q_PROPERTY(QmlTransition *add READ add WRITE setAdd)
public:
    enum PositionerType { None = 0x0, Horizontal = 0x1, Vertical = 0x2, Both = 0x3 };
    QmlGraphicsBasePositioner(PositionerType, QmlGraphicsItem *parent);
    ~QmlGraphicsBasePositioner();

    int spacing() const;
    void setSpacing(int);

    QmlTransition *move() const;
    void setMove(QmlTransition *);

    QmlTransition *add() const;
    void setAdd(QmlTransition *);

protected:
    QmlGraphicsBasePositioner(QmlGraphicsBasePositionerPrivate &dd, PositionerType at, QmlGraphicsItem *parent);
    virtual void componentComplete();
    virtual QVariant itemChange(GraphicsItemChange, const QVariant &);
    void finishApplyTransitions();

Q_SIGNALS:
    void spacingChanged();

protected Q_SLOTS:
    virtual void doPositioning()=0;
    void prePositioning();

protected:
    struct PositionedItem {
        PositionedItem(QmlGraphicsItem *i) : item(i), isNew(false), isVisible(true) {}
        bool operator==(const PositionedItem &other) const { return other.item == item; }
        QmlGraphicsItem *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(QmlGraphicsBasePositioner)
    Q_DECLARE_PRIVATE_D(QGraphicsItem::d_ptr.data(), QmlGraphicsBasePositioner)
};

class Q_DECLARATIVE_EXPORT QmlGraphicsColumn : public QmlGraphicsBasePositioner
{
    Q_OBJECT
public:
    QmlGraphicsColumn(QmlGraphicsItem *parent=0);
protected Q_SLOTS:
    virtual void doPositioning();
private:
    Q_DISABLE_COPY(QmlGraphicsColumn)
};

class Q_DECLARATIVE_EXPORT QmlGraphicsRow: public QmlGraphicsBasePositioner
{
    Q_OBJECT
public:
    QmlGraphicsRow(QmlGraphicsItem *parent=0);
protected Q_SLOTS:
    virtual void doPositioning();
private:
    Q_DISABLE_COPY(QmlGraphicsRow)
};

class Q_DECLARATIVE_EXPORT QmlGraphicsGrid : public QmlGraphicsBasePositioner
{
    Q_OBJECT
    Q_PROPERTY(int rows READ rows WRITE setRows)
    Q_PROPERTY(int columns READ columns WRITE setcolumns)
public:
    QmlGraphicsGrid(QmlGraphicsItem *parent=0);

    int rows() const {return _rows;}
    void setRows(const int rows){_rows = rows;}

    int columns() const {return _columns;}
    void setcolumns(const int columns){_columns = columns;}
protected Q_SLOTS:
    virtual void doPositioning();

private:
    int _rows;
    int _columns;
    Q_DISABLE_COPY(QmlGraphicsGrid)
};

class QmlGraphicsFlowPrivate;
class Q_DECLARATIVE_EXPORT QmlGraphicsFlow: public QmlGraphicsBasePositioner
{
    Q_OBJECT
    Q_PROPERTY(Flow flow READ flow WRITE setFlow NOTIFY flowChanged)
public:
    QmlGraphicsFlow(QmlGraphicsItem *parent=0);

    Q_ENUMS(Flow)
    enum Flow { LeftToRight, TopToBottom };
    Flow flow() const;
    void setFlow(Flow);

Q_SIGNALS:
    void flowChanged();

protected Q_SLOTS:
    virtual void doPositioning();

protected:
    QmlGraphicsFlow(QmlGraphicsFlowPrivate &dd, QmlGraphicsItem *parent);
private:
    Q_DISABLE_COPY(QmlGraphicsFlow)
    Q_DECLARE_PRIVATE_D(QGraphicsItem::d_ptr.data(), QmlGraphicsFlow)
};


QT_END_NAMESPACE

QML_DECLARE_TYPE(QmlGraphicsColumn)
QML_DECLARE_TYPE(QmlGraphicsRow)
QML_DECLARE_TYPE(QmlGraphicsGrid)
QML_DECLARE_TYPE(QmlGraphicsFlow)

QT_END_HEADER

#endif