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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
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** packaging of this file.  Please review the following information to
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****************************************************************************/

#ifndef QGRAPHICSANCHORLAYOUT_H
#define QGRAPHICSANCHORLAYOUT_H

#include <QtGui/qgraphicsitem.h>
#include <QtGui/qgraphicslayout.h>


QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Gui)

#if !defined(QT_NO_GRAPHICSVIEW) || (QT_EDITION & QT_MODULE_GRAPHICSVIEW) != QT_MODULE_GRAPHICSVIEW

class QGraphicsAnchorPrivate;
class QGraphicsAnchorLayout;
class QGraphicsAnchorLayoutPrivate;

class Q_GUI_EXPORT QGraphicsAnchor : public QObject
{
    Q_OBJECT
    Q_PROPERTY(qreal spacing READ spacing WRITE setSpacing RESET unsetSpacing)
    Q_PROPERTY(QSizePolicy::Policy sizePolicy READ sizePolicy WRITE setSizePolicy)
public:
    void setSpacing(qreal spacing);
    void unsetSpacing();
    qreal spacing() const;
    void setSizePolicy(QSizePolicy::Policy policy);
    QSizePolicy::Policy sizePolicy() const;
    ~QGraphicsAnchor();
private:
    QGraphicsAnchor(QGraphicsAnchorLayout *parent);

    Q_DECLARE_PRIVATE(QGraphicsAnchor)

    friend class QGraphicsAnchorLayoutPrivate;
    friend struct AnchorData;
};

class Q_GUI_EXPORT QGraphicsAnchorLayout : public QGraphicsLayout
{
public:
    QGraphicsAnchorLayout(QGraphicsLayoutItem *parent = 0);
    virtual ~QGraphicsAnchorLayout();

    QGraphicsAnchor *addAnchor(QGraphicsLayoutItem *firstItem, Qt::AnchorPoint firstEdge,
                               QGraphicsLayoutItem *secondItem, Qt::AnchorPoint secondEdge);
    QGraphicsAnchor *anchor(QGraphicsLayoutItem *firstItem, Qt::AnchorPoint firstEdge,
                            QGraphicsLayoutItem *secondItem, Qt::AnchorPoint secondEdge);

    void addCornerAnchors(QGraphicsLayoutItem *firstItem, Qt::Corner firstCorner,
                          QGraphicsLayoutItem *secondItem, Qt::Corner secondCorner);

    void addAnchors(QGraphicsLayoutItem *firstItem,
                    QGraphicsLayoutItem *secondItem,
                    Qt::Orientations orientations = Qt::Horizontal | Qt::Vertical);

    void setHorizontalSpacing(qreal spacing);
    void setVerticalSpacing(qreal spacing);
    void setSpacing(qreal spacing);
    qreal horizontalSpacing() const;
    qreal verticalSpacing() const;

    void removeAt(int index);
    void setGeometry(const QRectF &rect);
    int count() const;
    QGraphicsLayoutItem *itemAt(int index) const;

    void invalidate();
protected:
    QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const;

private:
    Q_DISABLE_COPY(QGraphicsAnchorLayout)
    Q_DECLARE_PRIVATE(QGraphicsAnchorLayout)

    friend class QGraphicsAnchor;
};

#endif

QT_END_NAMESPACE

QT_END_HEADER

#endif