内容

• 公共函数
• 重实现公共函数
• 详细描述

QSpacerItem 类

The QSpacerItem 类在布局中提供空白空间。 更多...

头：	#include <QSpacerItem>
qmake:	QT += widgets
继承：	QLayoutItem

• 所有成员列表，包括继承成员

公共函数

	QSpacerItem (int w , int h , QSizePolicy::Policy hPolicy = QSizePolicy::Minimum, QSizePolicy::Policy vPolicy = QSizePolicy::Minimum)
	~QSpacerItem ()
void	changeSize (int w , int h , QSizePolicy::Policy hPolicy = QSizePolicy::Minimum, QSizePolicy::Policy vPolicy = QSizePolicy::Minimum)
QSizePolicy	sizePolicy () const

重实现公共函数

virtual Qt::Orientations	expandingDirections () const override
virtual QRect	geometry () const override
virtual bool	isEmpty () const override
virtual QSize	maximumSize () const override
virtual QSize	minimumSize () const override
virtual void	setGeometry (const QRect & r ) override
virtual QSize	sizeHint () const override
virtual QSpacerItem *	spacerItem () override

• 17 公共函数继承自 QLayoutItem

详细描述

The QSpacerItem 类在布局中提供空白空间。

Normally, you don't need to use this class directly. Qt's built-in layout managers provide the following functions for manipulating empty space in layouts:

类	函数
QHBoxLayout	addSpacing() , addStretch() , insertSpacing() , insertStretch()
QGridLayout	setRowMinimumHeight() , setRowStretch() , setColumnMinimumWidth() , setColumnStretch()

另请参阅 QLayout , QWidgetItem ，和 QLayoutItem::spacerItem ().

成员函数文档编制

QSpacerItem:: QSpacerItem ( int w , int h , QSizePolicy::Policy hPolicy = QSizePolicy::Minimum, QSizePolicy::Policy vPolicy = QSizePolicy::Minimum)

Constructs a spacer item with preferred width w , preferred height h , horizontal size policy hPolicy and vertical size policy vPolicy .

The default values provide a gap that is able to stretch if nothing else wants the space.

QSpacerItem:: ~QSpacerItem ()

析构函数。

void QSpacerItem:: changeSize ( int w , int h , QSizePolicy::Policy hPolicy = QSizePolicy::Minimum, QSizePolicy::Policy vPolicy = QSizePolicy::Minimum)

Changes this spacer item to have preferred width w , preferred height h , horizontal size policy hPolicy and vertical size policy vPolicy .

The default values provide a gap that is able to stretch if nothing else wants the space.

Note that if changeSize() is called after the spacer item has been added to a layout, it is necessary to invalidate the layout in order for the spacer item's new size to take effect.

另请参阅 QSpacerItem::invalidate ().

[override virtual] Qt::Orientations QSpacerItem:: expandingDirections () const

重实现自 QLayoutItem::expandingDirections ().

[override virtual] QRect QSpacerItem:: geometry () const

重实现自 QLayoutItem::geometry ().

另请参阅 setGeometry ().

[override virtual] bool QSpacerItem:: isEmpty () const

重实现自 QLayoutItem::isEmpty ().

返回 true .

[override virtual] QSize QSpacerItem:: maximumSize () const

重实现自 QLayoutItem::maximumSize ().

[override virtual] QSize QSpacerItem:: minimumSize () const

重实现自 QLayoutItem::minimumSize ().

[override virtual] void QSpacerItem:: setGeometry (const QRect & r )

重实现自 QLayoutItem::setGeometry ().

另请参阅 geometry ().

[override virtual] QSize QSpacerItem:: sizeHint () const

重实现自 QLayoutItem::sizeHint ().

QSizePolicy QSpacerItem:: sizePolicy () const

返回此项的大小策略。

该函数在 Qt 5.5 引入。

[override virtual] QSpacerItem *QSpacerItem:: spacerItem ()

重实现自 QLayoutItem::spacerItem ().

返回指向此对象的指针。