QMarginsF Class

The QMarginsF class defines the four margins of a rectangle. 更多...

头：	#include <QMarginsF>
qmake:	QT += core
Since:	Qt 5.3

该类在 Qt 5.3 引入。

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公共函数

	QMarginsF (const QMargins & margins )
	QMarginsF (qreal left , qreal top , qreal right , qreal bottom )
	QMarginsF ()
qreal	bottom () const
bool	isNull () const
qreal	left () const
qreal	right () const
void	setBottom (qreal bottom )
void	setLeft (qreal left )
void	setRight (qreal right )
void	setTop (qreal Top )
QMargins	toMargins () const
qreal	top () const
QMarginsF &	operator*= (qreal factor )
QMarginsF &	operator+= (const QMarginsF & margins )
QMarginsF &	operator+= (qreal addend )
QMarginsF &	operator-= (const QMarginsF & margins )
QMarginsF &	operator-= (qreal subtrahend )
QMarginsF &	operator/= (qreal divisor )

相关非成员

bool	operator!= (const QMarginsF & lhs , const QMarginsF & rhs )
QMarginsF	operator* (const QMarginsF & lhs , qreal rhs )
QMarginsF	operator* (qreal lhs , const QMarginsF & rhs )
QMarginsF	operator+ (const QMarginsF & lhs , const QMarginsF & rhs )
QMarginsF	operator+ (const QMarginsF & lhs , qreal rhs )
QMarginsF	operator+ (qreal lhs , const QMarginsF & rhs )
QMarginsF	operator+ (const QMarginsF & margins )
QMarginsF	operator- (const QMarginsF & lhs , const QMarginsF & rhs )
QMarginsF	operator- (const QMarginsF & lhs , qreal rhs )
QMarginsF	operator- (const QMarginsF & margins )
QMarginsF	operator/ (const QMarginsF & lhs , qreal rhs )
QDataStream &	operator<< (QDataStream & stream , const QMarginsF & m )
bool	operator== (const QMarginsF & lhs , const QMarginsF & rhs )
QDataStream &	operator>> (QDataStream & stream , QMarginsF & m )

详细描述

QMarginsF defines a set of four margins; left, top, right and bottom, that describe the size of the borders surrounding a rectangle.

The isNull () 函数返回 true only if all margins are very close to zero.

QMarginsF objects can be streamed as well as compared.

成员函数文档编制

QMarginsF:: QMarginsF (const QMargins & margins )

Constructs margins copied from the given margins .

QMarginsF:: QMarginsF ( qreal left , qreal top , qreal right , qreal bottom )

构造边距采用给定 left , top , right , bottom

另请参阅 setLeft (), setRight (), setTop ()，和 setBottom ().

QMarginsF:: QMarginsF ()

Constructs a margins object with all margins set to 0.

另请参阅 isNull ().

qreal QMarginsF:: bottom () const

返回下边距。

另请参阅 setBottom ().

bool QMarginsF:: isNull () const

返回 true if all margins are very close to 0; otherwise returns false.

另请参阅 qFuzzyIsNull .

qreal QMarginsF:: left () const

返回左边距。

另请参阅 setLeft ().

qreal QMarginsF:: right () const

返回右边距。

另请参阅 setRight ().

void QMarginsF:: setBottom ( qreal bottom )

将下边距设为 bottom .

另请参阅 bottom ().

void QMarginsF:: setLeft ( qreal left )

将左边距设为 left .

另请参阅 left ().

void QMarginsF:: setRight ( qreal right )

将右边距设为 right .

另请参阅 right ().

void QMarginsF:: setTop ( qreal Top )

将上边距设为 Top .

另请参阅 top ().

QMargins QMarginsF:: toMargins () const

Returns an integer based copy of this margins object.

Note that the components in the returned margins will be rounded to the nearest integer.

另请参阅 QMarginsF ().

qreal QMarginsF:: top () const

Returns the top margin.

另请参阅 setTop ().

QMarginsF &QMarginsF:: operator*= ( qreal factor )

Multiplies each component of this object by factor and returns a reference to it.

另请参阅 operator/= ().

QMarginsF &QMarginsF:: operator+= (const QMarginsF & margins )

Add each component of margins to the respective component of this object and returns a reference to it.

另请参阅 operator-= ().

QMarginsF &QMarginsF:: operator+= ( qreal addend )

这是重载函数。

添加 addend to each component of this object and returns a reference to it.

另请参阅 operator-= ().

QMarginsF &QMarginsF:: operator-= (const QMarginsF & margins )

Subtract each component of margins from the respective component of this object and returns a reference to it.

另请参阅 operator+= ().

QMarginsF &QMarginsF:: operator-= ( qreal subtrahend )

这是重载函数。

减去 subtrahend from each component of this object and returns a reference to it.

另请参阅 operator+= ().

QMarginsF &QMarginsF:: operator/= ( qreal divisor )

Divides each component of this object by divisor and returns a reference to it.

另请参阅 operator*= ().

相关非成员

bool operator!= (const QMarginsF & lhs , const QMarginsF & rhs )

返回 true if lhs and rhs are sufficiently different; otherwise returns false .

警告： This function does not check for strict inequality; instead, it uses a fuzzy comparison to compare the margins.

另请参阅 qFuzzyCompare .

QMarginsF operator* (const QMarginsF & lhs , qreal rhs )

这是重载函数。

返回 QMarginsF object that is formed by multiplying each component of the given lhs margins by rhs factor.

另请参阅 QMarginsF::operator*= () 和 QMarginsF::operator/= ().

QMarginsF operator* ( qreal lhs , const QMarginsF & rhs )

这是重载函数。

返回 QMarginsF object that is formed by multiplying each component of the given lhs margins by rhs factor.

另请参阅 QMarginsF::operator*= () 和 QMarginsF::operator/= ().

QMarginsF operator+ (const QMarginsF & lhs , const QMarginsF & rhs )

返回 QMarginsF object that is the sum of the given margins, lhs and rhs ；分别相加各分量。

另请参阅 QMarginsF::operator+= () 和 QMarginsF::operator-= ().

QMarginsF operator+ (const QMarginsF & lhs , qreal rhs )

返回 QMarginsF object that is formed by adding rhs to lhs .

另请参阅 QMarginsF::operator+= () 和 QMarginsF::operator-= ().

QMarginsF operator+ ( qreal lhs , const QMarginsF & rhs )

返回 QMarginsF object that is formed by adding lhs to rhs .

另请参阅 QMarginsF::operator+= () 和 QMarginsF::operator-= ().

QMarginsF operator+ (const QMarginsF & margins )

Returns a QMargin object that is formed from all components of margins .

QMarginsF operator- (const QMarginsF & lhs , const QMarginsF & rhs )

返回 QMarginsF 对象的形成是通过减去 rhs from lhs ；分别减去各分量。

另请参阅 QMarginsF::operator+= () 和 QMarginsF::operator-= ().

QMarginsF operator- (const QMarginsF & lhs , qreal rhs )

返回 QMarginsF 对象的形成是通过减去 rhs from lhs .

另请参阅 QMarginsF::operator+= () 和 QMarginsF::operator-= ().

QMarginsF operator- (const QMarginsF & margins )

Returns a QMargin object that is formed by negating all components of margins .

QMarginsF operator/ (const QMarginsF & lhs , qreal rhs )

这是重载函数。

返回 QMarginsF object that is formed by dividing the components of the given lhs margins by the given rhs divisor.

另请参阅 QMarginsF::operator*= () 和 QMarginsF::operator/= ().

QDataStream & operator<< ( QDataStream & stream , const QMarginsF & m )

Writes margin m 到给定 stream 并返回流引用。

另请参阅 序列化 Qt 数据类型 .

bool operator== (const QMarginsF & lhs , const QMarginsF & rhs )

返回 true if lhs and rhs are approximately equal; otherwise returns false.

警告： This function does not check for strict equality; instead, it uses a fuzzy comparison to compare the margins.

另请参阅 qFuzzyCompare .

QDataStream & operator>> ( QDataStream & stream , QMarginsF & m )

Reads a margin from the given stream into margin m 并返回流引用。

另请参阅 序列化 Qt 数据类型 .

内容

• 公共函数

• 相关非成员

• 详细描述