/**

* If the default sort order should be overwritten for this widget, you can transform the value in here.

*

* @param vl The vector layer.

* @param fieldIdx The index of the field.

* @param config The editor widget config.

* @param cache The editor widget cache.

* @param value The value to represent.

*

* @return By default the value is returned unmodified.

*

* @note Added in 2.16

*/

virtual QVariant sortValue( QgsVectorLayer* vl, int fieldIdx, const QgsEditorWidgetConfig& config, const QVariant& cache, const QVariant& value ) const;

/**

* Return the alignment for a particular field. By default this will consider the field type but can be overwritten if mapped

* values are represented.

* @param vl The vector layer.

* @param fieldIdx The index of the field.

* @param config The editor widget config.

* @return The alignment flag, normally Qt::AlignRight or Qt::AlignLeft

*/

virtual Qt::AlignmentFlag alignmentFlag( QgsVectorLayer* vl, int fieldIdx, const QgsEditorWidgetConfig& config ) const;

/**

* Create a cache for a given field.

*

* @param vl The vector layer.

* @param fieldIdx The index of the field.

* @param config The editor widget config.

*

* @return The default implementation returns an invalid QVariant

*/

virtual QVariant createCache( QgsVectorLayer* vl, int fieldIdx, const QgsEditorWidgetConfig& config );