QGraphicsOpacityEffect

The QGraphicsOpacityEffect class provides an opacity effect. More

Inheritance diagram of PySide2.QtWidgets.QGraphicsOpacityEffect

New in version 4.6.

Synopsis

Functions

Slots

Signals

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.

../../_images/graphicseffect-opacity.png
class PySide2.QtWidgets.QGraphicsOpacityEffect([parent=None])
param parent

PySide2.QtCore.QObject

Constructs a new QGraphicsOpacityEffect instance. The parent parameter is passed to QGraphicsEffect ‘s constructor.

PySide2.QtWidgets.QGraphicsOpacityEffect.opacity()
Return type

float

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.

See also

setOpacityMask()

PySide2.QtWidgets.QGraphicsOpacityEffect.opacityChanged(opacity)
Parameters

opacity – float

PySide2.QtWidgets.QGraphicsOpacityEffect.opacityMask()
Return type

PySide2.QtGui.QBrush

This property holds the opacity mask of the effect..

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

For example:

# ...
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.

See also

setOpacity()

PySide2.QtWidgets.QGraphicsOpacityEffect.opacityMaskChanged(mask)
Parameters

maskPySide2.QtGui.QBrush

PySide2.QtWidgets.QGraphicsOpacityEffect.setOpacity(opacity)
Parameters

opacity – float

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.

See also

setOpacityMask()

PySide2.QtWidgets.QGraphicsOpacityEffect.setOpacityMask(mask)
Parameters

maskPySide2.QtGui.QBrush

This property holds the opacity mask of the effect..

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

For example:

# ...
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.

See also

setOpacity()