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QGraphicsBlurEffect Class Reference
[
QtGui module]

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

 #include <QGraphicsBlurEffect>

Inherits QGraphicsEffect.

This class was introduced in Qt 4.6.


Properties


Public Functions

QGraphicsBlurEffect ( QObject * parent = 0 )
~QGraphicsBlurEffect ()
Qt::RenderHint blurHint () const
int blurRadius () const

Reimplemented Public Functions

virtual QRectF boundingRectFor ( const QRectF & rect ) const

Public Slots

void setBlurHint ( Qt::RenderHint hint )
void setBlurRadius ( int blurRadius )

Signals

void blurHintChanged ( Qt::RenderHint hint )
void blurRadiusChanged ( int radius )

Reimplemented Protected Functions

virtual void draw ( QPainter * painter, QGraphicsEffectSource * source )

Additional Inherited Members


Detailed Description

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 setBlurHint() to choose the quality or performance blur hints.

By default, the blur radius is 5 pixels.

See also QGraphicsDropShadowEffect, QGraphicsPixelizeEffect, QGraphicsGrayscaleEffect, QGraphicsColorizeEffect, and QGraphicsOpacityEffect.


Property Documentation

blurHint : Qt::RenderHint

This property holds the blur hint of the effect.

Use the Qt::PerformanceHint hint to say that you want a faster blur, and the Qt::QualityHint hint to say that you prefer a higher quality blur.

When animating the blur radius it's recommended to use Qt::PerformanceHint.

By default, the blur hint is Qt::PerformanceHint.

Access functions:

Qt::RenderHint blurHint () const
void setBlurHint ( Qt::RenderHint hint )

Notifier signal:

void blurHintChanged ( Qt::RenderHint hint )

blurRadius : int

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.

Access functions:

int blurRadius () const
void setBlurRadius ( int blurRadius )

Notifier signal:

void blurRadiusChanged ( int radius )

Member Function Documentation

QGraphicsBlurEffect::QGraphicsBlurEffect ( QObject * parent = 0 )

Constructs a new QGraphicsBlurEffect instance. The parent parameter is passed to QGraphicsEffect's constructor.

QGraphicsBlurEffect::~QGraphicsBlurEffect ()

Destroys the effect.

void QGraphicsBlurEffect::blurHintChanged ( Qt::RenderHint hint )   [signal]

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

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

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

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

Reimplemented from QGraphicsEffect::boundingRectFor().

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

Reimplemented from QGraphicsEffect::draw().


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Qt 4.6.0