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

#ifndef QMLGRAPHICSVISUALDATAMODEL_H
#define QMLGRAPHICSVISUALDATAMODEL_H

#include <qml.h>

#include <QtCore/qobject.h>
#include <QtCore/qabstractitemmodel.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Declarative)
/*****************************************************************************
 *****************************************************************************
 XXX Experimental
 *****************************************************************************
*****************************************************************************/

class QmlGraphicsItem;
class QmlComponent;
class QmlPackage;
class QmlGraphicsVisualDataModelPrivate;

class Q_DECLARATIVE_EXPORT QmlGraphicsVisualModel : public QObject
{
    Q_OBJECT

    Q_PROPERTY(int count READ count NOTIFY countChanged)

public:
    QmlGraphicsVisualModel() {}
    virtual ~QmlGraphicsVisualModel() {}

    enum ReleaseFlag { Referenced = 0x01, Destroyed = 0x02 };
    Q_DECLARE_FLAGS(ReleaseFlags, ReleaseFlag)

    virtual int count() const = 0;
    virtual bool isValid() const = 0;
    virtual QmlGraphicsItem *item(int index, bool complete=true) = 0;
    virtual ReleaseFlags release(QmlGraphicsItem *item) = 0;
    virtual void completeItem() = 0;
    virtual QVariant evaluate(int index, const QString &expression, QObject *objectContext) = 0;
    virtual QString stringValue(int, const QString &) { return QString(); }

    virtual int indexOf(QmlGraphicsItem *item, QObject *objectContext) const = 0;

Q_SIGNALS:
    void countChanged();
    void itemsInserted(int index, int count);
    void itemsRemoved(int index, int count);
    void itemsMoved(int from, int to, int count);
    void createdItem(int index, QmlGraphicsItem *item);
    void destroyingItem(QmlGraphicsItem *item);

protected:
    QmlGraphicsVisualModel(QObjectPrivate &dd, QObject *parent = 0)
        : QObject(dd, parent) {}

private:
    Q_DISABLE_COPY(QmlGraphicsVisualModel)
};

class QmlGraphicsVisualItemModelAttached;
class QmlGraphicsVisualItemModelPrivate;
class Q_DECLARATIVE_EXPORT QmlGraphicsVisualItemModel : public QmlGraphicsVisualModel
{
    Q_OBJECT
    Q_DECLARE_PRIVATE(QmlGraphicsVisualItemModel)

    Q_PROPERTY(QmlList<QmlGraphicsItem *>* children READ children NOTIFY childrenChanged DESIGNABLE false)
    Q_CLASSINFO("DefaultProperty", "children")

public:
    QmlGraphicsVisualItemModel();
    virtual ~QmlGraphicsVisualItemModel() {}

    virtual int count() const;
    virtual bool isValid() const;
    virtual QmlGraphicsItem *item(int index, bool complete=true);
    virtual ReleaseFlags release(QmlGraphicsItem *item);
    virtual void completeItem();
    virtual QString stringValue(int index, const QString &role);
    virtual QVariant evaluate(int index, const QString &expression, QObject *objectContext);

    virtual int indexOf(QmlGraphicsItem *item, QObject *objectContext) const;

    QmlList<QmlGraphicsItem *> *children();

    static QmlGraphicsVisualItemModelAttached *qmlAttachedProperties(QObject *obj);

Q_SIGNALS:
    void childrenChanged();

private:
    Q_DISABLE_COPY(QmlGraphicsVisualItemModel)
};


class Q_DECLARATIVE_EXPORT QmlGraphicsVisualDataModel : public QmlGraphicsVisualModel
{
    Q_OBJECT
    Q_DECLARE_PRIVATE(QmlGraphicsVisualDataModel)

    Q_PROPERTY(QVariant model READ model WRITE setModel)
    Q_PROPERTY(QmlComponent *delegate READ delegate WRITE setDelegate)
    Q_PROPERTY(QString part READ part WRITE setPart)
    Q_PROPERTY(QObject *parts READ parts CONSTANT)
    Q_CLASSINFO("DefaultProperty", "delegate")
public:
    QmlGraphicsVisualDataModel();
    QmlGraphicsVisualDataModel(QmlContext *);
    virtual ~QmlGraphicsVisualDataModel();

    QVariant model() const;
    void setModel(const QVariant &);

    QmlComponent *delegate() const;
    void setDelegate(QmlComponent *);

    QString part() const;
    void setPart(const QString &);

    int count() const;
    bool isValid() const { return delegate() != 0; }
    QmlGraphicsItem *item(int index, bool complete=true);
    QmlGraphicsItem *item(int index, const QByteArray &, bool complete=true);
    ReleaseFlags release(QmlGraphicsItem *item);
    void completeItem();
    virtual QString stringValue(int index, const QString &role);
    QVariant evaluate(int index, const QString &expression, QObject *objectContext);

    int indexOf(QmlGraphicsItem *item, QObject *objectContext) const;

    QObject *parts();

Q_SIGNALS:
    void createdPackage(int index, QmlPackage *package);
    void destroyingPackage(QmlPackage *package);

private Q_SLOTS:
    void _q_itemsChanged(int, int, const QList<int> &);
    void _q_itemsInserted(int index, int count);
    void _q_itemsRemoved(int index, int count);
    void _q_itemsMoved(int from, int to, int count);
    void _q_rowsInserted(const QModelIndex &,int,int);
    void _q_rowsRemoved(const QModelIndex &,int,int);
    void _q_rowsMoved(const QModelIndex &, int, int, const QModelIndex &, int);
    void _q_dataChanged(const QModelIndex&,const QModelIndex&);
    void _q_createdPackage(int index, QmlPackage *package);
    void _q_destroyingPackage(QmlPackage *package);

private:
    Q_DISABLE_COPY(QmlGraphicsVisualDataModel)
};

QT_END_NAMESPACE

QML_DECLARE_TYPE(QmlGraphicsVisualModel)
QML_DECLARE_TYPE(QmlGraphicsVisualItemModel)
QML_DECLARE_TYPEINFO(QmlGraphicsVisualItemModel, QML_HAS_ATTACHED_PROPERTIES)
QML_DECLARE_TYPE(QmlGraphicsVisualDataModel)

QT_END_HEADER

#endif // QMLGRAPHICSVISUALDATAMODEL_H