QGraphicsBlurEffect Class
The QGraphicsBlurEffect class provides a blur effect. 更多...
| 头文件: | #include <QGraphicsBlurEffect> |
| qmake: | QT += widgets |
| 开始支持版本: | Qt 4.6 |
| 基类: | QGraphicsEffect |
公有类型
属性
- blurHints : BlurHints
- blurRadius : qreal
- 1 个属性继承自 QGraphicsEffect
- 1 个属性继承自 QObject
公有函数
| QGraphicsBlurEffect(QObject *parent = Q_NULLPTR) | |
| ~QGraphicsBlurEffect() | |
| BlurHints | blurHints() const |
| qreal | blurRadius() const |
重新实现的公有函数
| virtual QRectF | boundingRectFor(const QRectF &rect) const |
- 3 个公有函数继承自 QGraphicsEffect
- 32 个公有函数继承自 QObject
公有槽函数
| void | setBlurHints(BlurHints hints) |
| void | setBlurRadius(qreal blurRadius) |
- 2 个公有槽函数继承自 QGraphicsEffect
- 1 个公有槽函数继承自 QObject
信号
| void | blurHintsChanged(BlurHints hints) |
| void | blurRadiusChanged(qreal radius) |
- 1 个信号继承自 QGraphicsEffect
- 2 个信号继承自 QObject
重新实现的受保护函数
| virtual void | draw(QPainter *painter) |
- 7 个受保护的函数继承自 QGraphicsEffect
- 9 个受保护的函数继承自 QObject
其他继承的成员
- 1 个公有变量继承自 QObject
- 10 个静态公有成员继承自 QObject
- 7 个受保护的函数继承自 QGraphicsEffect
- 9 个受保护的函数继承自 QObject
- 2 个受保护的变量继承自 QObject
详细描述
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.
参见 QGraphicsDropShadowEffect, QGraphicsColorizeEffect, and QGraphicsOpacityEffect.
成员类型
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.
| Constant | Value | Description |
|---|---|---|
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. |
This enum was introduced or modified in Qt 4.6.
The BlurHints type is a typedef for QFlags<BlurHint>. It stores an OR combination of BlurHint values.
参见 blurHints() and setBlurHints().
属性
blurHints : BlurHints
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.
访问函数:
| BlurHints | blurHints() const |
| void | setBlurHints(BlurHints hints) |
Notifier signal:
| 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) |
Notifier signal:
| void | blurRadiusChanged(qreal radius) |
成员函数
QGraphicsBlurEffect::QGraphicsBlurEffect(QObject *parent = Q_NULLPTR)
Constructs a new QGraphicsBlurEffect instance. The parent parameter is passed to QGraphicsEffect's constructor.
QGraphicsBlurEffect::~QGraphicsBlurEffect()
Destroys the effect.
[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.
Note: Notifier signal for property 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.
Note: Notifier signal for property blurRadius.
[virtual] QRectF QGraphicsBlurEffect::boundingRectFor(const QRectF &rect) const
重新实现 QGraphicsEffect::boundingRectFor().
[virtual protected] void QGraphicsBlurEffect::draw(QPainter *painter)
重新实现 QGraphicsEffect::draw().