內容

• 公共函數
• 重實現公共函數
• 詳細描述

QSpacerItem 類

The QSpacerItem 類在布局中提供空白空間。 更多...

頭：	#include <QSpacerItem>
qmake:	QT += widgets
繼承：	QLayoutItem

• 所有成員列錶，包括繼承成員

公共函數

	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

重實現公共函數

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 公共函數繼承自 QLayoutItem

詳細描述

The QSpacerItem 類在布局中提供空白空間。

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:

類	函數
QHBoxLayout	addSpacing() , addStretch() , insertSpacing() , insertStretch()
QGridLayout	setRowMinimumHeight() , setRowStretch() , setColumnMinimumWidth() , setColumnStretch()

另請參閱 QLayout , QWidgetItem ，和 QLayoutItem::spacerItem ().

成員函數文檔編製

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 ()

析構函數。

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.

另請參閱 QSpacerItem::invalidate ().

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

重實現自 QLayoutItem::expandingDirections ().

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

重實現自 QLayoutItem::geometry ().

另請參閱 setGeometry ().

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

重實現自 QLayoutItem::isEmpty ().

返迴 true .

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

重實現自 QLayoutItem::maximumSize ().

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

重實現自 QLayoutItem::minimumSize ().

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

重實現自 QLayoutItem::setGeometry ().

另請參閱 geometry ().

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

重實現自 QLayoutItem::sizeHint ().

QSizePolicy QSpacerItem:: sizePolicy () const

返迴此項的大小策略。

該函數在 Qt 5.5 引入。

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

重實現自 QLayoutItem::spacerItem ().

返迴指嚮此對象的指針。