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TheQGraphicsOpacityEffect class provides an opacity effect.More...
| Header: | #include <QGraphicsOpacityEffect> |
| Since: | Qt 4.6 |
| Inherits: | QGraphicsEffect |
| QGraphicsOpacityEffect(QObject * parent = 0) | |
| ~QGraphicsOpacityEffect() | |
| qreal | opacity() const |
| QBrush | opacityMask() const |
| void | setOpacity(qreal opacity) |
| void | setOpacityMask(const QBrush & mask) |
| void | opacityChanged(qreal opacity) |
| void | opacityMaskChanged(const QBrush & mask) |
| virtual void | draw(QPainter * painter) |
TheQGraphicsOpacityEffect class provides an opacity effect.
An opacity effect renders the source with an opacity. This effect is useful for making the source semi-transparent, similar to a fade-in/fade-out sequence. The opacity can be modified using thesetOpacity() function.
By default, the opacity is 0.7.
See alsoQGraphicsDropShadowEffect,QGraphicsBlurEffect, andQGraphicsColorizeEffect.
This property holds the opacity of the effect.
The value should be in the range of 0.0 to 1.0, where 0.0 is fully transparent and 1.0 is fully opaque.
By default, the opacity is 0.7.
Access functions:
| qreal | opacity() const |
| void | setOpacity(qreal opacity) |
Notifier signal:
| void | opacityChanged(qreal opacity) |
See alsosetOpacityMask().
This property holds the opacity mask of the effect.
An opacity mask allows you apply opacity to portions of an element.
For example:
...QLinearGradient alphaGradient(rect.topLeft(), rect.bottomLeft());alphaGradient.setColorAt(0.0,Qt::transparent);alphaGradient.setColorAt(0.5,Qt::black);alphaGradient.setColorAt(1.0,Qt::transparent);QGraphicsOpacityEffect*effect=newQGraphicsOpacityEffect;effect->setOpacityMask(alphaGradient);...
There is no opacity mask by default.
Access functions:
| QBrush | opacityMask() const |
| void | setOpacityMask(const QBrush & mask) |
Notifier signal:
| void | opacityMaskChanged(const QBrush & mask) |
See alsosetOpacity().
Constructs a newQGraphicsOpacityEffect instance. Theparent parameter is passed toQGraphicsEffect's constructor.
Destroys the effect.
[virtual protected]void QGraphicsOpacityEffect::draw(QPainter * painter)Reimplemented fromQGraphicsEffect::draw().
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