source: trunk/examples/declarative/cppextensions/qgraphicslayouts/qgraphicslinearlayout/linearlayout.h

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#ifndef LINEARLAYOUT_H
#define LINEARLAYOUT_H

#include <qdeclarative.h>

#include <QGraphicsLinearLayout>
#include <QGraphicsLayoutItem>

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

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


class LinearLayoutAttached;
class GraphicsLinearLayoutObject : public QObject, public QGraphicsLinearLayout
{
    Q_OBJECT
    Q_INTERFACES(QGraphicsLayout QGraphicsLayoutItem)

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

    QDeclarativeListProperty<QGraphicsLayoutItem> children() { return QDeclarativeListProperty<QGraphicsLayoutItem>(this, 0, children_append, children_count, children_at, children_clear); }

    qreal contentsMargin() const;
    void setContentsMargin(qreal);

    void removeAt(int index);

    static LinearLayoutAttached *qmlAttachedProperties(QObject *);

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

private:
    friend class LinearLayoutAttached;

    void clearChildren();
    void insertLayoutItem(int, QGraphicsLayoutItem *);

    static void children_append(QDeclarativeListProperty<QGraphicsLayoutItem> *prop, QGraphicsLayoutItem *item) {
        static_cast<GraphicsLinearLayoutObject*>(prop->object)->insertLayoutItem(-1, item);
    }

    static void children_clear(QDeclarativeListProperty<QGraphicsLayoutItem> *prop) {
        static_cast<GraphicsLinearLayoutObject*>(prop->object)->clearChildren();
    }

    static int children_count(QDeclarativeListProperty<QGraphicsLayoutItem> *prop) {
        return static_cast<GraphicsLinearLayoutObject*>(prop->object)->count();
    }

    static QGraphicsLayoutItem *children_at(QDeclarativeListProperty<QGraphicsLayoutItem> *prop, int index) {
        return static_cast<GraphicsLinearLayoutObject*>(prop->object)->itemAt(index);
    }

    static QHash<QGraphicsLayoutItem*, LinearLayoutAttached*> attachedProperties;
};


class LinearLayoutAttached : public QObject
{
    Q_OBJECT

    Q_PROPERTY(int stretchFactor READ stretchFactor WRITE setStretchFactor NOTIFY stretchChanged)
    Q_PROPERTY(Qt::Alignment alignment READ alignment WRITE setAlignment NOTIFY alignmentChanged)
    Q_PROPERTY(int spacing READ spacing WRITE setSpacing NOTIFY spacingChanged)

public:
    LinearLayoutAttached(QObject *parent);

    int stretchFactor() const { return m_stretch; }
    void setStretchFactor(int f);
    Qt::Alignment alignment() const { return m_alignment; }
    void setAlignment(Qt::Alignment a);
    int spacing() const { return m_spacing; }
    void setSpacing(int s);

signals:
    void stretchChanged(QGraphicsLayoutItem*, int);
    void alignmentChanged(QGraphicsLayoutItem*, Qt::Alignment);
    void spacingChanged(QGraphicsLayoutItem*, int);

private:
    int m_stretch;
    Qt::Alignment m_alignment;
    int m_spacing;
};

QML_DECLARE_INTERFACE(QGraphicsLayoutItem)
QML_DECLARE_INTERFACE(QGraphicsLayout)
QML_DECLARE_TYPE(GraphicsLinearLayoutStretchItemObject)
QML_DECLARE_TYPE(GraphicsLinearLayoutObject)
QML_DECLARE_TYPEINFO(GraphicsLinearLayoutObject, QML_HAS_ATTACHED_PROPERTIES)

#endif