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42 lines
1.6 KiB
Plaintext
42 lines
1.6 KiB
Plaintext
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/***************************************************************************
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qgsexpressioncontextgenerator.sip - QgsExpressionContextGenerator
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---------------------
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begin : 1.8.2016
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copyright : (C) 2016 by Matthias Kuhn
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email : matthias@opengis.ch
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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/**
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* \ingroup core
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* Abstract interface for generating an expression context.
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*
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* You need to implement this interface in a class and register this class with
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* QgsFieldExpressionWidget::registerExpressionGenerator().
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*
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* Whenever this widget requires an expression context it will call the createExpressionContext()
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* method to get a context.
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*
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* @note added in QGIS 3.0
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*/
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class QgsExpressionContextGenerator
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{
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%TypeHeaderCode
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#include "qgsexpressioncontextgenerator.h"
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%End
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public:
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/**
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* This method needs to be reimplemented in all classes which implement this interface
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* and return an expression context.
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*/
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virtual QgsExpressionContext createExpressionContext() const = 0;
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};
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