QGraphicsBlurEffect Class Reference
|
enum | BlurHint { PerformanceHint, QualityHint, AnimationHint } |
flags | BlurHints |
QGraphicsBlurEffect ( QObject * parent = 0 ) | |
~QGraphicsBlurEffect () | |
BlurHints | blurHints () const |
qreal | blurRadius () const |
virtual QRectF | boundingRectFor ( const QRectF & rect ) const |
void | setBlurHints ( BlurHints hints ) |
void | setBlurRadius ( qreal blurRadius ) |
void | blurHintsChanged ( BlurHints hints ) |
void | blurRadiusChanged ( qreal radius ) |
virtual void | draw ( QPainter * painter ) |
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.
See also QGraphicsDropShadowEffect, QGraphicsColorizeEffect, and QGraphicsOpacityEffect.
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.
Константа | Значение | Описание |
---|---|---|
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. |
Данное перечисление было введено в Qt 4.6.
The BlurHints type is a typedef for QFlags<BlurHint>. It stores an OR combination of BlurHint values.
See also blurHints() and setBlurHints().
This property holds the blur hint of the effect.
Use the 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.
Функции доступа:
BlurHints | blurHints () const |
void | setBlurHints ( BlurHints hints ) |
Уведомляющий сигнал:
void | blurHintsChanged ( BlurHints hints ) |
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.
Функции доступа:
qreal | blurRadius () const |
void | setBlurRadius ( qreal blurRadius ) |
Уведомляющий сигнал:
void | blurRadiusChanged ( qreal radius ) |
Constructs a new QGraphicsBlurEffect instance. The parent parameter is passed to QGraphicsEffect's constructor.
Destroys the effect.
This signal is emitted whenever the effect's blur hints changes. The hints parameter holds the effect's new blur hints.
This signal is emitted whenever the effect's blur radius changes. The radius parameter holds the effect's new blur radius.
Reimplemented from QGraphicsEffect::boundingRectFor().
Reimplemented from QGraphicsEffect::draw().
Авторские права © 2010 Nokia Corporation и/или её дочерние компании | Торговые марки | Qt 4.6.4 |
Попытка перевода Qt документации. Если есть желание присоединиться, или если есть замечания или пожелания, то заходите на форум: Перевод Qt документации на русский язык... Люди внесшие вклад в перевод: Команда переводчиков |