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** This file is part of the QtDeclarative module of the Qt Toolkit.
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#ifndef GRAPHICSLAYOUTS_H
#define GRAPHICSLAYOUTS_H

#include "graphicswidgets.h"
#include <QGraphicsLinearLayout>
#include <QGraphicsGridLayout>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Declarative)

QML_DECLARE_INTERFACE(QGraphicsLayoutItem);
QML_DECLARE_INTERFACE(QGraphicsLayout);

class QGraphicsLinearLayoutStretchItemObject : public QObject, public QGraphicsLayoutItem
{
    Q_OBJECT
    Q_INTERFACES(QGraphicsLayoutItem)
public:
    QGraphicsLinearLayoutStretchItemObject(QObject *parent = 0);

    virtual QSizeF sizeHint(Qt::SizeHint, const QSizeF &) const;
};
QML_DECLARE_TYPE(QGraphicsLinearLayoutStretchItemObject);

//TODO:
//  -content margins
//  -per-item spacing (does this need to be exposed?)
//  -per-item alignment
class LinearLayoutAttached;
class QGraphicsLinearLayoutObject : public QObject, public QGraphicsLinearLayout
{
    Q_OBJECT
    Q_INTERFACES(QGraphicsLayout QGraphicsLayoutItem)

    Q_PROPERTY(QmlList<QGraphicsLayoutItem *> *children READ children)
    Q_PROPERTY(Qt::Orientation orientation READ orientation WRITE setOrientation)
    Q_PROPERTY(qreal spacing READ spacing WRITE setSpacing)
    Q_CLASSINFO("DefaultProperty", "children")
public:
    QGraphicsLinearLayoutObject(QObject * = 0);
    ~QGraphicsLinearLayoutObject();

    QmlList<QGraphicsLayoutItem *> *children() { return &_children; }

    static QObject *qmlAttachedProperties(QObject *);

private Q_SLOTS:
    void updateStretch(QGraphicsLayoutItem*,int);
    void updateAlignment(QGraphicsLayoutItem*,Qt::Alignment);

private:
    friend class LinearLayoutAttached;
    void clearChildren();
    void insertLayoutItem(int, QGraphicsLayoutItem *);
    static QHash<QGraphicsLayoutItem*, QObject*> attachedProperties;

    class ChildList : public QmlList<QGraphicsLayoutItem *>
    {
    public:
        ChildList(QGraphicsLinearLayoutObject *o)
            : obj(o) {}

        virtual void append(QGraphicsLayoutItem *item)
        {
            insert(-1, item);
        }
        virtual void clear() { obj->clearChildren(); }
        virtual int count() const { return obj->count(); }
        virtual void removeAt(int i) { obj->removeAt(i); }
        virtual QGraphicsLayoutItem *at(int i) const { return obj->itemAt(i); }
        virtual void insert(int i, QGraphicsLayoutItem *item) { obj->insertLayoutItem(i, item); }

    private:
        QGraphicsLinearLayoutObject *obj;
    };

    ChildList _children;
};
QML_DECLARE_TYPE(QGraphicsLinearLayoutObject);

//TODO:
//  -content margins
//  -column and row specific settings:
//      -alignment
//      -fixed/min/max/preferred width
//      -spacing
//      -stretch
class QGraphicsGridLayoutObject : public QObject, public QGraphicsGridLayout
{
    Q_OBJECT
    Q_INTERFACES(QGraphicsLayout QGraphicsLayoutItem)

    Q_PROPERTY(QmlList<QGraphicsLayoutItem *> *children READ children)
    Q_PROPERTY(qreal spacing READ spacing WRITE setSpacing)
    Q_PROPERTY(qreal verticalSpacing READ verticalSpacing WRITE setVerticalSpacing)
    Q_PROPERTY(qreal horizontalSpacing READ horizontalSpacing WRITE setHorizontalSpacing)
    Q_CLASSINFO("DefaultProperty", "children")
public:
    QGraphicsGridLayoutObject(QObject * = 0);
    ~QGraphicsGridLayoutObject();

    QmlList<QGraphicsLayoutItem *> *children() { return &_children; }

    qreal spacing() const;

    static QObject *qmlAttachedProperties(QObject *);

private:
    friend class GraphicsLayoutAttached;
    void addWidget(QGraphicsWidget *);
    void clearChildren();
    void addLayoutItem(QGraphicsLayoutItem *);
    static QHash<QGraphicsLayoutItem*, QObject*> attachedProperties;

    class ChildList : public QmlList<QGraphicsLayoutItem *>
    {
    public:
        ChildList(QGraphicsGridLayoutObject *o)
            : obj(o) {}

        virtual void append(QGraphicsLayoutItem *o)
        {
            obj->addLayoutItem(o);
        }
        virtual void clear() { obj->clearChildren(); }
        virtual int count() const { return obj->count(); }
        virtual void removeAt(int i) { obj->removeAt(i); }
        virtual QGraphicsLayoutItem *at(int i) const { return obj->itemAt(i); }
        //XXX GridLayout doesn't have an insert, so for now we treat it as an append.
        //    this is obviously potenitally dangerous -- perhaps should be a concrete
        //    list with no relation to layout index, etc at all.
        virtual void insert(int, QGraphicsLayoutItem *item) { append(item); }

    private:
        QGraphicsGridLayoutObject *obj;
    };

    ChildList _children;
};
QML_DECLARE_TYPE(QGraphicsGridLayoutObject);

#endif // GRAPHICSLAYOUTS_H

QT_END_NAMESPACE

QT_END_HEADER