QskLayoutElement.h

/******************************************************************************
 * QSkinny - Copyright (C) The authors
 *           SPDX-License-Identifier: BSD-3-Clause
 *****************************************************************************/
 
#ifndef QSK_LAYOUT_ELEMENT_H
#define QSK_LAYOUT_ELEMENT_H
 
#include "QskGlobal.h"
#include <qnamespace.h>
#include <qrect.h>
 
class QskSizePolicy;
class QskLayoutMetrics;
 
class QSK_EXPORT QskLayoutElement
{
  public:
    QskLayoutElement();
    virtual ~QskLayoutElement();
 
    QskLayoutMetrics metrics( Qt::Orientation, qreal constraint ) const;
 
    virtual QskSizePolicy sizePolicy() const = 0;
    virtual Qt::Alignment alignment() const = 0;
 
    QSizeF constrainedSize( const QSizeF& ) const;
 
    QSizeF sizeConstraint( Qt::SizeHint, const QSizeF& constraint ) const;
 
    virtual QSizeF sizeHint( Qt::SizeHint,
        const QSizeF& constraint = QSizeF() ) const = 0;
 
    qreal heightForWidth( qreal ) const;
    qreal widthForHeight( qreal ) const;
 
  private:
    Q_DISABLE_COPY( QskLayoutElement )
 
    qreal metric( Qt::Orientation, Qt::SizeHint, qreal constraint ) const;
 
    qreal boundedSize( Qt::Orientation, qreal ) const;
};
 
inline qreal QskLayoutElement::heightForWidth( qreal width ) const
{
    return sizeHint( Qt::PreferredSize, QSizeF( width, -1.0 ) ).height();
}
 
inline qreal QskLayoutElement::widthForHeight( qreal height ) const
{
    return sizeHint( Qt::PreferredSize, QSizeF( -1.0, height ) ).width();
}
 
class QQuickItem;
 
class QSK_EXPORT QskItemLayoutElement final : public QskLayoutElement
{
  public:
    QskItemLayoutElement( const QQuickItem* );
 
    QskSizePolicy sizePolicy() const override;
    Qt::Alignment alignment() const override;
 
  private:
    QSizeF sizeHint( Qt::SizeHint, const QSizeF& ) const override;
 
    const QQuickItem* m_item = nullptr;
};
 
#endif