内容

• 公共类型
• 特性
• 公共函数
• 重实现公共函数
• 公共槽
• 信号
• 重实现保护函数
• 详细描述

QGraphicsBlurEffect Class

QGraphicsBlurEffect class provides a blur effect. 更多...

头：	#include <QGraphicsBlurEffect>
qmake:	QT += widgets
Since:	Qt 4.6
继承：	QGraphicsEffect

• 所有成员列表，包括继承成员

公共类型

enum	BlurHint { PerformanceHint, QualityHint, AnimationHint }
flags	BlurHints

特性

• blurHints : BlurHints
• blurRadius : qreal

• 1 特性继承自 QGraphicsEffect
• 1 特性继承自 QObject

公共函数

	QGraphicsBlurEffect (QObject * parent = Q_NULLPTR)
	~QGraphicsBlurEffect ()
BlurHints	blurHints () const
qreal	blurRadius () const

重实现公共函数

virtual QRectF

boundingRectFor (const QRectF & rect ) const

• 3 公共函数继承自 QGraphicsEffect
• 32 公共函数继承自 QObject

公共槽

void	setBlurHints (BlurHints hints )
void	setBlurRadius (qreal blurRadius )

• 2 public slots inherited from QGraphicsEffect
• 1 公共槽继承自 QObject

信号

void	blurHintsChanged (BlurHints hints )
void	blurRadiusChanged (qreal radius )

• 1 信号继承自 QGraphicsEffect
• 2 信号继承自 QObject

重实现保护函数

virtual void

draw (QPainter * painter )

• 7 protected functions inherited from QGraphicsEffect
• 9 保护函数继承自 QObject

额外继承成员

• 11 静态公共成员继承自 QObject
• 7 protected functions inherited from QGraphicsEffect
• 9 保护函数继承自 QObject

详细描述

QGraphicsBlurEffect class provides a blur effect.

A blur effect blurs the source. This effect is useful for reducing details, such as when the source loses focus and you want to draw attention to other elements. The level of detail can be modified using the setBlurRadius () function. Use setBlurHints () to choose the blur hints.

By default, the blur radius is 5 pixels. The blur radius is specified in device coordinates.

另请参阅 QGraphicsDropShadowEffect , QGraphicsColorizeEffect ，和 QGraphicsOpacityEffect .

成员类型文档编制

enum QGraphicsBlurEffect:: BlurHint
flags QGraphicsBlurEffect:: BlurHints

This enum describes the possible hints that can be used to control how blur effects are applied. The hints might not have an effect in all the paint engines.

常量	值	描述
QGraphicsBlurEffect::PerformanceHint	0x00	Indicates that rendering performance is the most important factor, at the potential cost of lower quality.
QGraphicsBlurEffect::QualityHint	0x01	Indicates that rendering quality is the most important factor, at the potential cost of lower performance.
QGraphicsBlurEffect::AnimationHint	0x02	Indicates that the blur radius is going to be animated, hinting that the implementation can keep a cache of blurred verisons of the source. Do not use this hint if the source is going to be dynamically changing.

该枚举在 Qt 4.6 引入或被修改。

The BlurHints type is a typedef for QFlags <BlurHint>. It stores an OR combination of BlurHint values.

另请参阅 blurHints () 和 setBlurHints ().

特性文档编制

blurHints : BlurHints

This property holds the blur hint of the effect.

使用 PerformanceHint hint to say that you want a faster blur, the QualityHint hint to say that you prefer a higher quality blur, or the AnimationHint when you want to animate the blur radius.

By default, the blur hint is PerformanceHint .

访问函数：

BlurHints	blurHints () const
void	setBlurHints (BlurHints hints )

通知程序信号：

void	blurHintsChanged (BlurHints hints )

blurRadius : qreal

This property holds the blur radius of the effect.

Using a smaller radius results in a sharper appearance, whereas a bigger radius results in a more blurred appearance.

By default, the blur radius is 5 pixels.

The radius is given in device coordinates, meaning it is unaffected by scale.

访问函数：

qreal	blurRadius () const
void	setBlurRadius (qreal blurRadius )

通知程序信号：

void	blurRadiusChanged (qreal radius )

成员函数文档编制

QGraphicsBlurEffect:: QGraphicsBlurEffect ( QObject * parent = Q_NULLPTR)

构造新的 QGraphicsBlurEffect instance. The parent 参数会被传递给 QGraphicsEffect 的构造函数。

QGraphicsBlurEffect:: ~QGraphicsBlurEffect ()

销毁效果。

[signal] void QGraphicsBlurEffect:: blurHintsChanged ( BlurHints hints )

This signal is emitted whenever the effect's blur hints changes. The hints parameter holds the effect's new blur hints.

注意： 通知程序信号对于特性 blurHints .

[signal] void QGraphicsBlurEffect:: blurRadiusChanged ( qreal radius )

This signal is emitted whenever the effect's blur radius changes. The radius parameter holds the effect's new blur radius.

注意： 通知程序信号对于特性 blurRadius .

[virtual] QRectF QGraphicsBlurEffect:: boundingRectFor (const QRectF & rect ) const

重实现自 QGraphicsEffect::boundingRectFor ().

[virtual protected] void QGraphicsBlurEffect:: draw ( QPainter * painter )

重实现自 QGraphicsEffect::draw ().