Class: QgsExpressionContextGenerator¶
- class qgis.core.QgsExpressionContextGenerator¶
Bases:
sip.wrapper
Abstract interface for generating an expression context.
You need to implement this interface in a class and register this class with
QgsFieldExpressionWidget.registerExpressionGenerator()
.This is used for example in
QgsPropertyOverrideButton
orQgsFieldExpressionWidget
classes which will ask for a newQgsExpressionContext
every time the expression editor is opened. This way they are able to provide an up-to-date expression editor even when the environment changes.Methods
This method needs to be reimplemented in all classes which implement this interface and return an expression context.
- createExpressionContext(self) → QgsExpressionContext¶
This method needs to be reimplemented in all classes which implement this interface and return an expression context.
New in version 3.0.
- Return type