QGraphicsOpacityEffect Class▲
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Header: QGraphicsOpacityEffect
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CMake:
find_package(Qt6 REQUIRED COMPONENTS Widgets)
target_link_libraries(mytarget PRIVATE Qt6::Widgets)
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qmake: QT += widgets
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Inherits: QGraphicsEffect
Detailed Description▲
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 the setOpacity() function.
By default, the opacity is 0.7.
See Also▲
Property Documentation▲
opacity : qreal▲
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:
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qreal opacity() const
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void setOpacity(qreal opacity)
Notifier signal:
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void opacityChanged(qreal opacity)
See Also▲
See also setOpacityMask()
opacityMask : QBrush▲
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 = new QGraphicsOpacityEffect;
effect->setOpacityMask(alphaGradient);
...There is no opacity mask by default.
Access functions:
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opacityMask() const
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void setOpacityMask(const &mask)
Notifier signal:
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void opacityMaskChanged(const &mask)
See Also▲
See also setOpacity()
Member Function Documentation▲
QGraphicsOpacityEffect::QGraphicsOpacityEffect(QObject *parent = nullptr)▲
Constructs a new QGraphicsOpacityEffect instance. The parent parameter is passed to QGraphicsEffect's constructor.
[virtual] QGraphicsOpacityEffect::~QGraphicsOpacityEffect()▲
Destroys the effect.
[override virtual protected] void QGraphicsOpacityEffect::draw(QPainter *painter)▲
Reimplements: QGraphicsEffect::draw(QPainter *painter).
void QGraphicsOpacityEffect::opacityChanged(qreal opacity)▲
This signal is emitted whenever the effect's opacity changes. The opacity parameter holds the effect's new opacity.
Notifier signal for property opacity.
void QGraphicsOpacityEffect::opacityMaskChanged(const QBrush &mask)▲
This signal is emitted whenever the effect's opacity mask changes. The mask parameter holds the effect's new opacity mask.
Notifier signal for property opacityMask.