QGraphicsOpacityEffect ¶

概要 ¶

详细描述 ¶

PySide.QtGui.QGraphicsOpacityEffect 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 the PySide.QtGui.QGraphicsOpacityEffect.setOpacity() 函数。

默认情况下，不透明度是 0.7。

另请参阅

PySide.QtGui.QGraphicsDropShadowEffect PySide.QtGui.QGraphicsBlurEffect PySide.QtGui.QGraphicsColorizeEffect

class PySide.QtGui. QGraphicsOpacityEffect ( [ parent=None ] ) ¶

参数：	parent – PySide.QtCore.QObject

构造新 PySide.QtGui.QGraphicsOpacityEffect instance. The parent 参数会被传递给 PySide.QtGui.QGraphicsEffect ‘s constructor.

PySide.QtGui.QGraphicsOpacityEffect. opacity ( ) ¶

返回类型：	PySide.QtCore.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.

默认情况下，不透明度是 0.7。

另请参阅

PySide.QtGui.QGraphicsOpacityEffect.setOpacityMask()

PySide.QtGui.QGraphicsOpacityEffect. opacityChanged ( opacity ) ¶

参数：	opacity – PySide.QtCore.qreal

PySide.QtGui.QGraphicsOpacityEffect. opacityMask ( ) ¶

返回类型：	PySide.QtGui.QBrush

This property holds the opacity mask of the effect..

An opacity mask allows you apply opacity to portions of an element.

例如：

# ...
alphaGradient = QLinearGradient(rect.topLeft(), rect.bottomLeft())
alphaGradient.setColorAt(0.0, Qt.transparent)
alphaGradient.setColorAt(0.5, Qt.black)
alphaGradient.setColorAt(1.0, Qt.transparent)
effect = QGraphicsOpacityEffect()
effect.setOpacityMask(alphaGradient)
# ...
											

There is no opacity mask by default.

另请参阅

PySide.QtGui.QGraphicsOpacityEffect.setOpacity()

PySide.QtGui.QGraphicsOpacityEffect. opacityMaskChanged ( mask ) ¶

参数：	mask – PySide.QtGui.QBrush

PySide.QtGui.QGraphicsOpacityEffect. setOpacity ( opacity ) ¶

参数：	opacity – PySide.QtCore.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.

默认情况下，不透明度是 0.7。

另请参阅

PySide.QtGui.QGraphicsOpacityEffect.setOpacityMask()

PySide.QtGui.QGraphicsOpacityEffect. setOpacityMask ( mask ) ¶

参数：	mask – PySide.QtGui.QBrush

This property holds the opacity mask of the effect..

An opacity mask allows you apply opacity to portions of an element.

例如：

# ...
alphaGradient = QLinearGradient(rect.topLeft(), rect.bottomLeft())
alphaGradient.setColorAt(0.0, Qt.transparent)
alphaGradient.setColorAt(0.5, Qt.black)
alphaGradient.setColorAt(1.0, Qt.transparent)
effect = QGraphicsOpacityEffect()
effect.setOpacityMask(alphaGradient)
# ...
											

There is no opacity mask by default.

另请参阅

PySide.QtGui.QGraphicsOpacityEffect.setOpacity()