102 lines
2.5 KiB
C++
102 lines
2.5 KiB
C++
/******************************************************************************
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* QSkinny - Copyright (C) The authors
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* SPDX-License-Identifier: BSD-3-Clause
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*****************************************************************************/
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#ifndef QSK_LAYOUT_ENGINE_2D_H
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#define QSK_LAYOUT_ENGINE_2D_H
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#include "QskGlobal.h"
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#include "QskLayoutChain.h"
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#include "QskSizePolicy.h"
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#include <qnamespace.h>
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#include <memory>
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class QskLayoutElement;
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class QSK_EXPORT QskLayoutEngine2D
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{
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public:
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QskLayoutEngine2D();
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virtual ~QskLayoutEngine2D();
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virtual int count() const = 0;
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int rowCount() const;
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int columnCount() const;
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bool setVisualDirection( Qt::LayoutDirection );
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Qt::LayoutDirection visualDirection() const;
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bool setDefaultAlignment( Qt::Alignment );
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Qt::Alignment defaultAlignment() const;
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bool setExtraSpacingAt( Qt::Edges edges );
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Qt::Edges extraSpacingAt() const;
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bool setSpacing( qreal spacing, Qt::Orientations );
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qreal spacing( Qt::Orientation ) const;
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qreal defaultSpacing( Qt::Orientation ) const;
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void invalidate();
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qreal widthForHeight( qreal height ) const;
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qreal heightForWidth( qreal width ) const;
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QSizeF sizeHint( Qt::SizeHint, const QSizeF& constraint ) const;
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void setGeometries( const QRectF& );
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protected:
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QRectF geometryAt( const QskLayoutElement*, const QRect& grid ) const;
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enum : quint8
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{
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ElementCache = 1 << 0,
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LayoutCache = 1 << 1
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};
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void invalidate( int what );
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private:
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Q_DISABLE_COPY( QskLayoutEngine2D )
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void updateSegments( const QSizeF& ) const;
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virtual void layoutItems() = 0;
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virtual int effectiveCount( Qt::Orientation ) const = 0;
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virtual void invalidateElementCache() = 0;
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QskSizePolicy::ConstraintType constraintType() const;
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virtual QskSizePolicy sizePolicyAt( int index ) const = 0;
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void setupChain( Qt::Orientation ) const;
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void setupChain( Qt::Orientation, const QskLayoutChain::Segments& ) const;
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virtual void setupChain( Qt::Orientation,
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const QskLayoutChain::Segments&, QskLayoutChain& ) const = 0;
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class PrivateData;
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std::unique_ptr< PrivateData > m_data;
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};
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inline void QskLayoutEngine2D::invalidate()
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{
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invalidate( ElementCache | LayoutCache );
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}
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inline int QskLayoutEngine2D::rowCount() const
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{
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return effectiveCount( Qt::Vertical );
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}
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inline int QskLayoutEngine2D::columnCount() const
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{
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return effectiveCount( Qt::Horizontal );
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}
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#endif
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