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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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** This file is part of the QtDeclarative module of the Qt Toolkit.
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****************************************************************************/

#ifndef QDECLARATIVEGRIDVIEW_H
#define QDECLARATIVEGRIDVIEW_H

#include "qdeclarativeflickable_p.h"

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Declarative)
class QDeclarativeVisualModel;
class QDeclarativeGridViewAttached;
class QDeclarativeGridViewPrivate;
class Q_DECLARATIVE_EXPORT QDeclarativeGridView : public QDeclarativeFlickable
{
    Q_OBJECT
    Q_DECLARE_PRIVATE_D(QGraphicsItem::d_ptr.data(), QDeclarativeGridView)

    Q_PROPERTY(QVariant model READ model WRITE setModel)
    Q_PROPERTY(QDeclarativeComponent *delegate READ delegate WRITE setDelegate)
    Q_PROPERTY(int currentIndex READ currentIndex WRITE setCurrentIndex NOTIFY currentIndexChanged)
    Q_PROPERTY(QDeclarativeItem *currentItem READ currentItem NOTIFY currentIndexChanged)
    Q_PROPERTY(int count READ count NOTIFY countChanged)

    Q_PROPERTY(QDeclarativeComponent *highlight READ highlight WRITE setHighlight)
    Q_PROPERTY(QDeclarativeItem *highlightItem READ highlightItem NOTIFY highlightChanged)
    Q_PROPERTY(bool highlightFollowsCurrentItem READ highlightFollowsCurrentItem WRITE setHighlightFollowsCurrentItem)

    Q_PROPERTY(Flow flow READ flow WRITE setFlow)
    Q_PROPERTY(bool keyNavigationWraps READ isWrapEnabled WRITE setWrapEnabled)
    Q_PROPERTY(int cacheBuffer READ cacheBuffer WRITE setCacheBuffer)
    Q_PROPERTY(int cellWidth READ cellWidth WRITE setCellWidth NOTIFY cellWidthChanged)
    Q_PROPERTY(int cellHeight READ cellHeight WRITE setCellHeight NOTIFY cellHeightChanged)
    Q_CLASSINFO("DefaultProperty", "data")

public:
    QDeclarativeGridView(QDeclarativeItem *parent=0);
    ~QDeclarativeGridView();

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

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

    int currentIndex() const;
    void setCurrentIndex(int idx);

    QDeclarativeItem *currentItem();
    QDeclarativeItem *highlightItem();
    int count() const;

    QDeclarativeComponent *highlight() const;
    void setHighlight(QDeclarativeComponent *highlight);

    bool highlightFollowsCurrentItem() const;
    void setHighlightFollowsCurrentItem(bool);

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

    bool isWrapEnabled() const;
    void setWrapEnabled(bool);

    int cacheBuffer() const;
    void setCacheBuffer(int);

    int cellWidth() const;
    void setCellWidth(int);

    int cellHeight() const;
    void setCellHeight(int);

    static QDeclarativeGridViewAttached *qmlAttachedProperties(QObject *);

public Q_SLOTS:
    void moveCurrentIndexUp();
    void moveCurrentIndexDown();
    void moveCurrentIndexLeft();
    void moveCurrentIndexRight();
    void positionViewAtIndex(int index);

Q_SIGNALS:
    void countChanged();
    void currentIndexChanged();
    void cellWidthChanged();
    void cellHeightChanged();
    void highlightChanged();

protected:
    virtual void viewportMoved();
    virtual qreal minYExtent() const;
    virtual qreal maxYExtent() const;
    virtual qreal minXExtent() const;
    virtual qreal maxXExtent() const;
    virtual void keyPressEvent(QKeyEvent *);
    virtual void componentComplete();

private Q_SLOTS:
    void trackedPositionChanged();
    void itemsInserted(int index, int count);
    void itemsRemoved(int index, int count);
    void itemsMoved(int from, int to, int count);
    void modelReset();
    void destroyRemoved();
    void createdItem(int index, QDeclarativeItem *item);
    void destroyingItem(QDeclarativeItem *item);
    void sizeChange();
    void layout();

private:
    void refill();
};

class QDeclarativeGridViewAttached : public QObject
{
    Q_OBJECT
public:
    QDeclarativeGridViewAttached(QObject *parent)
        : QObject(parent), m_isCurrent(false), m_delayRemove(false) {}
    ~QDeclarativeGridViewAttached() {
        attachedProperties.remove(parent());
    }

    Q_PROPERTY(QDeclarativeGridView *view READ view CONSTANT)
    QDeclarativeGridView *view() { return m_view; }

    Q_PROPERTY(bool isCurrentItem READ isCurrentItem NOTIFY currentItemChanged)
    bool isCurrentItem() const { return m_isCurrent; }
    void setIsCurrentItem(bool c) {
        if (m_isCurrent != c) {
            m_isCurrent = c;
            emit currentItemChanged();
        }
    }

    Q_PROPERTY(bool delayRemove READ delayRemove WRITE setDelayRemove NOTIFY delayRemoveChanged)
    bool delayRemove() const { return m_delayRemove; }
    void setDelayRemove(bool delay) {
        if (m_delayRemove != delay) {
            m_delayRemove = delay;
            emit delayRemoveChanged();
        }
    }

    static QDeclarativeGridViewAttached *properties(QObject *obj) {
        QDeclarativeGridViewAttached *rv = attachedProperties.value(obj);
        if (!rv) {
            rv = new QDeclarativeGridViewAttached(obj);
            attachedProperties.insert(obj, rv);
        }
        return rv;
    }

    void emitAdd() { emit add(); }
    void emitRemove() { emit remove(); }

Q_SIGNALS:
    void currentItemChanged();
    void delayRemoveChanged();
    void add();
    void remove();

public:
    QDeclarativeGridView *m_view;
    bool m_isCurrent;
    bool m_delayRemove;

    static QHash<QObject*, QDeclarativeGridViewAttached*> attachedProperties;
};


QT_END_NAMESPACE

QML_DECLARE_TYPE(QDeclarativeGridView)
QML_DECLARE_TYPEINFO(QDeclarativeGridView, QML_HAS_ATTACHED_PROPERTIES)

QT_END_HEADER

#endif