QGraphicsOpacityEffect

Note

This class was introduced in Qt 4.6

Synopsis

Functions

• def opacity ()
• def opacityMask ()

Slots

• def setOpacity (opacity)
• def setOpacityMask (mask)

Signals

• def opacityChanged (opacity)
• def opacityMaskChanged (mask)

Detailed Description

The 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() function.

By default, the opacity is 0.7.

See also

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

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

Parameters:parent – PySide.QtCore.QObject

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

PySide.QtGui.QGraphicsOpacityEffect.opacity()

Return type: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.

By default, the opacity is 0.7.

See also

PySide.QtGui.QGraphicsOpacityEffect.setOpacityMask()

PySide.QtGui.QGraphicsOpacityEffect.opacityChanged(opacity)

Parameters:opacity – PySide.QtCore.qreal

PySide.QtGui.QGraphicsOpacityEffect.opacityMask()

Return type:PySide.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

PySide.QtGui.QGraphicsOpacityEffect.setOpacity()

PySide.QtGui.QGraphicsOpacityEffect.opacityMaskChanged(mask)

Parameters:mask – PySide.QtGui.QBrush

PySide.QtGui.QGraphicsOpacityEffect.setOpacity(opacity)

Parameters: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.

By default, the opacity is 0.7.

See also

PySide.QtGui.QGraphicsOpacityEffect.setOpacityMask()

PySide.QtGui.QGraphicsOpacityEffect.setOpacityMask(mask)

Parameters: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.

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

PySide.QtGui.QGraphicsOpacityEffect.setOpacity()