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QGraphicsOpacityEffect Class Reference
^{[QtGui module]}

The QGraphicsOpacityEffect class provides an opacity effect. More...

Inherits QGraphicsEffect.

Methods

• __init__ (self, QObject parent = None)
• draw (self, QPainter painter)
• float opacity (self)
• QBrush opacityMask (self)
• setOpacity (self, float opacity)
• setOpacityMask (self, QBrush mask)

Qt Signals

• void opacityChanged (qreal)
• void opacityMaskChanged (const QBrush&)

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.

Method Documentation

QGraphicsOpacityEffect.__init__ (self, QObject parent = None)

The parent argument, if not None, causes self to be owned by Qt instead of PyQt.

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

QGraphicsOpacityEffect.draw (self, QPainter painter)

Reimplemented from QGraphicsEffect.draw().

float QGraphicsOpacityEffect.opacity (self)

QBrush QGraphicsOpacityEffect.opacityMask (self)

QGraphicsOpacityEffect.setOpacity (self, float opacity)

This method is also a Qt slot with the C++ signature void setOpacity(qreal).

QGraphicsOpacityEffect.setOpacityMask (self, QBrush mask)

This method is also a Qt slot with the C++ signature void setOpacityMask(const QBrush&).

Qt Signal Documentation

void opacityChanged (qreal)

This is the default overload of this signal.

This signal is emitted whenever the effect's opacity changes. The opacity parameter holds the effect's new opacity.

void opacityMaskChanged (const QBrush&)

This is the default overload of this signal.

This signal is emitted whenever the effect's opacity mask changes. The mask parameter holds the effect's new opacity mask.