/****************************************************************************
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** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
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****************************************************************************/

#ifndef DATAPARTICLE_H
#define DATAPARTICLE_H
#include "qsgparticlepainter_p.h"
#include <QPointer>
#include <QSet>
QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Declarative)
class QSGVisualDataModel;
class QSGModelParticleAttached;

class QSGModelParticle : public QSGParticlePainter
{
    Q_OBJECT

    Q_PROPERTY(QVariant model READ model WRITE setModel NOTIFY modelChanged)
    Q_PROPERTY(QDeclarativeComponent *delegate READ delegate WRITE setDelegate NOTIFY delegateChanged)
    Q_PROPERTY(int modelCount READ modelCount NOTIFY modelCountChanged)
    Q_PROPERTY(bool fade READ fade WRITE setFade NOTIFY fadeChanged)
    Q_CLASSINFO("DefaultProperty", "delegate")
public:
    explicit QSGModelParticle(QSGItem *parent = 0);
    virtual ~QSGModelParticle();
    QVariant model() const;
    void setModel(const QVariant &);

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

    int modelCount() const;

    bool fade() const { return m_fade; }

    virtual QSGNode *updatePaintNode(QSGNode *, UpdatePaintNodeData *);

    static QSGModelParticleAttached *qmlAttachedProperties(QObject *object);
signals:
    void modelChanged();
    void delegateChanged();
    void modelCountChanged();
    void fadeChanged();

public slots:
    void freeze(QSGItem* item);
    void unfreeze(QSGItem* item);

    void setFade(bool arg){if (arg == m_fade) return; m_fade = arg; emit fadeChanged();}
protected:
    virtual void reset();
    virtual void commit(int gIdx, int pIdx);
    virtual void initialize(int gIdx, int pIdx);
    void prepareNextFrame();
private slots:
    void updateCount();
    void processPending();
private:
    bool m_ownModel;
    QDeclarativeComponent* m_comp;
    QSGVisualDataModel *m_model;
    QVariant m_dataSource;
    QList<QSGItem*> m_deletables;
    QList< QSGParticleData* > m_requests;
    bool m_fade;

    QList<QSGItem*> m_pendingItems;
    QList<int> m_available;
    QSet<QSGItem*> m_stasis;
    qreal m_lastT;
    int m_activeCount;
    int m_modelCount;
};

class QSGModelParticleAttached : public QObject
{
    Q_OBJECT
    Q_PROPERTY(QSGModelParticle* particle READ particle CONSTANT)
public:
    QSGModelParticleAttached(QObject* parent)
        : QObject(parent), m_mp(0)
    {;}
    QSGModelParticle* particle() {return m_mp;}
    void detach(){emit detached();}
    void attach(){emit attached();}
private:
    QSGModelParticle* m_mp;
    friend class QSGModelParticle;
Q_SIGNALS:
    void detached();
    void attached();
};

QT_END_NAMESPACE

QML_DECLARE_TYPEINFO(QSGModelParticle, QML_HAS_ATTACHED_PROPERTIES)

QT_END_HEADER
#endif // DATAPARTICLE_H