內容

• 公共類型
• 特性
• 公共函數
• 重實現公共函數
• 公共槽
• 信號
• 重實現保護函數
• 詳細描述

QGraphicsBlurEffect Class

The QGraphicsBlurEffect class provides a blur effect. 更多...

頭：	#include <QGraphicsBlurEffect>
qmake:	QT += widgets
Since:	Qt 4.6
繼承：	QGraphicsEffect

• 所有成員列錶，包括繼承成員

公共類型

enum	BlurHint { PerformanceHint, QualityHint, AnimationHint }
flags	BlurHints

特性

• blurHints : BlurHints
• blurRadius : qreal

• 1 特性繼承自 QGraphicsEffect
• 1 特性繼承自 QObject

公共函數

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

重實現公共函數

virtual QRectF

boundingRectFor (const QRectF & rect ) const

• 3 公共函數繼承自 QGraphicsEffect
• 32 公共函數繼承自 QObject

公共槽

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

• 2 公共槽繼承自 QGraphicsEffect
• 1 公共槽繼承自 QObject

信號

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

• 1 信號繼承自 QGraphicsEffect
• 2 信號繼承自 QObject

重實現保護函數

virtual void

draw (QPainter * painter )

• 7 protected functions inherited from QGraphicsEffect
• 9 保護函數繼承自 QObject

額外繼承成員

• 11 靜態公共成員繼承自 QObject
• 7 protected functions inherited from QGraphicsEffect
• 9 保護函數繼承自 QObject

詳細描述

The 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.

另請參閱 QGraphicsDropShadowEffect , QGraphicsColorizeEffect ，和 QGraphicsOpacityEffect .

成員類型文檔編製

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.

該枚舉在 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.

另請參閱 blurHints () 和 setBlurHints ().

特性文檔編製

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 .

訪問函數：

BlurHints	blurHints () const
void	setBlurHints (BlurHints hints )

通知程序信號：

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.

訪問函數：

qreal	blurRadius () const
void	setBlurRadius (qreal blurRadius )

通知程序信號：

void	blurRadiusChanged (qreal radius )

成員函數文檔編製

QGraphicsBlurEffect:: QGraphicsBlurEffect ( QObject * parent = Q_NULLPTR)

構造新的 QGraphicsBlurEffect instance. The parent 參數會被傳遞給 QGraphicsEffect 的構造函數。

QGraphicsBlurEffect:: ~QGraphicsBlurEffect ()

銷毀效果。

[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： 通知程序信號對於特性 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： 通知程序信號對於特性 blurRadius .

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

重實現自 QGraphicsEffect::boundingRectFor ().

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

重實現自 QGraphicsEffect::draw ().