QGraphicsOpacityEffect

The QGraphicsOpacityEffect class provides an opacity effect. More…

New in version 4.6.

Synopsis

Functions

• def opacity ()

• def opacityMask ()

Slots

• def setOpacity (opacity)

• def setOpacityMask (mask)

Signals

• def opacityChanged (opacity)

• def opacityMaskChanged (mask)

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

QGraphicsDropShadowEffect QGraphicsBlurEffect QGraphicsColorizeEffect

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:

mask – PySide2.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:

mask – 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()