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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 QLAYOUTITEM_H
#define QLAYOUTITEM_H
#include <QtWidgets/qtwidgetsglobal.h>
#include <QtWidgets/qsizepolicy.h>
#include <QtCore/qrect.h>
#include <limits.h>
QT_BEGIN_NAMESPACE
inline constexpr int QLAYOUTSIZE_MAX = INT_MAX/256/16;
class QLayout;
class QLayoutItem;
class QSpacerItem;
class QWidget;
class QSize;
class Q_WIDGETS_EXPORT QLayoutItem
{
public:
inline explicit QLayoutItem(Qt::Alignment alignment = Qt::Alignment());
virtual ~QLayoutItem();
virtual QSize sizeHint() const = 0;
virtual QSize minimumSize() const = 0;
virtual QSize maximumSize() const = 0;
virtual Qt::Orientations expandingDirections() const = 0;
virtual void setGeometry(const QRect&) = 0;
virtual QRect geometry() const = 0;
virtual bool isEmpty() const = 0;
virtual bool hasHeightForWidth() const;
virtual int heightForWidth(int) const;
virtual int minimumHeightForWidth(int) const;
virtual void invalidate();
virtual QWidget *widget() const;
virtual QLayout *layout();
virtual QSpacerItem *spacerItem();
Qt::Alignment alignment() const { return align; }
void setAlignment(Qt::Alignment a);
virtual QSizePolicy::ControlTypes controlTypes() const;
protected:
Qt::Alignment align;
};
inline QLayoutItem::QLayoutItem(Qt::Alignment aalignment)
: align(aalignment) { }
class Q_WIDGETS_EXPORT QSpacerItem : public QLayoutItem
{
public:
QSpacerItem(int w, int h,
QSizePolicy::Policy hData = QSizePolicy::Minimum,
QSizePolicy::Policy vData = QSizePolicy::Minimum)
: width(w), height(h), sizeP(hData, vData) { }
~QSpacerItem();
void changeSize(int w, int h,
QSizePolicy::Policy hData = QSizePolicy::Minimum,
QSizePolicy::Policy vData = QSizePolicy::Minimum);
QSize sizeHint() const override;
QSize minimumSize() const override;
QSize maximumSize() const override;
Qt::Orientations expandingDirections() const override;
bool isEmpty() const override;
void setGeometry(const QRect&) override;
QRect geometry() const override;
QSpacerItem *spacerItem() override;
QSizePolicy sizePolicy() const { return sizeP; }
private:
int width;
int height;
QSizePolicy sizeP;
QRect rect;
};
class Q_WIDGETS_EXPORT QWidgetItem : public QLayoutItem
{
Q_DISABLE_COPY(QWidgetItem)
public:
explicit QWidgetItem(QWidget *w) : wid(w) { }
~QWidgetItem();
QSize sizeHint() const override;
QSize minimumSize() const override;
QSize maximumSize() const override;
Qt::Orientations expandingDirections() const override;
bool isEmpty() const override;
void setGeometry(const QRect&) override;
QRect geometry() const override;
QWidget *widget() const override;
bool hasHeightForWidth() const override;
int heightForWidth(int) const override;
int minimumHeightForWidth(int) const override;
QSizePolicy::ControlTypes controlTypes() const override;
protected:
QWidget *wid;
};
class Q_WIDGETS_EXPORT QWidgetItemV2 : public QWidgetItem
{
public:
explicit QWidgetItemV2(QWidget *widget);
~QWidgetItemV2();
QSize sizeHint() const override;
QSize minimumSize() const override;
QSize maximumSize() const override;
int heightForWidth(int width) const override;
private:
enum { Dirty = -123, HfwCacheMaxSize = 3 };
inline bool useSizeCache() const;
void updateCacheIfNecessary() const;
inline void invalidateSizeCache() {
q_cachedMinimumSize.setWidth(Dirty);
q_hfwCacheSize = 0;
}
mutable QSize q_cachedMinimumSize;
mutable QSize q_cachedSizeHint;
mutable QSize q_cachedMaximumSize;
mutable QSize q_cachedHfws[HfwCacheMaxSize];
mutable short q_firstCachedHfw;
mutable short q_hfwCacheSize;
void *d;
friend class QWidgetPrivate;
Q_DISABLE_COPY(QWidgetItemV2)
};
QT_END_NAMESPACE
#endif // QLAYOUTITEM_H
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