qgraphicsanchorlayout.h

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#ifndef QGRAPHICSANCHORLAYOUT_H
#define QGRAPHICSANCHORLAYOUT_H
 
#include <QtWidgets/qtwidgetsglobal.h>
#include <QtWidgets/qgraphicsitem.h>
#include <QtWidgets/qgraphicslayout.h>
 
QT_REQUIRE_CONFIG(graphicsview);
 
QT_BEGIN_NAMESPACE
 
class QGraphicsAnchorPrivate;
class QGraphicsAnchorLayout;
class QGraphicsAnchorLayoutPrivate;
 
class Q_WIDGETS_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;
};
 
class Q_WIDGETS_EXPORT QGraphicsAnchorLayout : public QGraphicsLayout
{
public:
    QGraphicsAnchorLayout(QGraphicsLayoutItem *parent = nullptr);
    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) override;
    void setGeometry(const QRectF &rect) override;
    int count() const override;
    QGraphicsLayoutItem *itemAt(int index) const override;
 
    void invalidate() override;
protected:
    QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const override;
 
private:
    Q_DISABLE_COPY(QGraphicsAnchorLayout)
    Q_DECLARE_PRIVATE(QGraphicsAnchorLayout)
 
    friend class QGraphicsAnchor;
};
 
QT_END_NAMESPACE
 
#endif