QSGOpacityNode

The QSGOpacityNode class is used to change opacity of nodes. More

Inheritance diagram of PySide2.QtQuick.QSGOpacityNode

Synopsis

Functions

Detailed Description

Opacity applies to its subtree and can be nested. Multiple opacity nodes will be accumulated by multiplying their opacity. The accumulation happens as part of the rendering.

When nested opacity gets below a certain threshold, the subtree might be marked as blocked, causing isSubtreeBlocked() to return true. This is done for performance reasons.

Note

All classes with QSG prefix should be used solely on the scene graph’s rendering thread. See Scene Graph and Rendering for more information.

class QSGOpacityNode

Constructs an opacity node with a default opacity of 1.

Opacity accumulates downwards in the scene graph so a node with two QSGOpacityNode instances above it, both with opacity of 0.5, will have effective opacity of 0.25.

The default opacity of nodes is 1.

PySide2.QtQuick.QSGOpacityNode.combinedOpacity()
Return type

qreal

PySide2.QtQuick.QSGOpacityNode.opacity()
Return type

qreal

Returns this opacity node’s opacity.

See also

setOpacity()

PySide2.QtQuick.QSGOpacityNode.setCombinedOpacity(opacity)
Parameters

opacityqreal

Sets the combined opacity of this node to opacity .

This function is meant to be called by the node preprocessing prior to rendering the tree, so it will not mark the tree as dirty.

PySide2.QtQuick.QSGOpacityNode.setOpacity(opacity)
Parameters

opacityqreal

Sets the opacity of this node to opacity .

Before rendering the graph, the renderer will do an update pass over the subtree to propagate the opacity to its children.

The value will be bounded to the range 0 to 1.

See also

opacity()