A field formatter helps to handle and display values for a field. More...

#include <qgsfieldformatter.h>

Inheritance diagram for QgsFieldFormatter:

[legend]

Public Member Functions
	QgsFieldFormatter ()=default
	Default constructor. More...

virtual	~QgsFieldFormatter ()=default

virtual Qt::AlignmentFlag	alignmentFlag (QgsVectorLayer *layer, int fieldIndex, const QVariantMap &config) const
	Returns the alignment for a particular field. More...

virtual QVariant	createCache (QgsVectorLayer *layer, int fieldIndex, const QVariantMap &config) const
	Create a cache for a given field. More...

virtual QString	id () const =0
	Returns a unique id for this field formatter. More...

virtual QString	representValue (QgsVectorLayer *layer, int fieldIndex, const QVariantMap &config, const QVariant &cache, const QVariant &value) const
	Create a pretty String representation of the value. More...

virtual QVariant	sortValue (QgsVectorLayer *layer, int fieldIndex, const QVariantMap &config, const QVariant &cache, const QVariant &value) const
	If the default sort order should be overwritten for this widget, you can transform the value in here. More...

Detailed Description

A field formatter helps to handle and display values for a field.

It allows for using a shared configuration with the editor widgets for representation of attribute values. Field kits normally have one single instance which is managed by the QgsFieldFormatterRegistry. Custom field formatters should be registered there and field formatters for use within code should normally be obtained from there.

This is an abstract base class and will always need to be subclassed.

Since: QGIS 3.0

Definition at line 40 of file qgsfieldformatter.h.

Constructor & Destructor Documentation

QgsFieldFormatter::QgsFieldFormatter ( )

default

Default constructor.

virtual QgsFieldFormatter::~QgsFieldFormatter ( )

virtualdefault

Member Function Documentation

Qt::AlignmentFlag QgsFieldFormatter::alignmentFlag	(	QgsVectorLayer *	layer,
		int	fieldIndex,
		const QVariantMap &	config
	)		const

virtual

Returns the alignment for a particular field.

By default this will consider the field type but can be overwritten if mapped values are represented.

Since: QGIS 3.0

Definition at line 45 of file qgsfieldformatter.cpp.

QVariant QgsFieldFormatter::createCache	(	QgsVectorLayer *	layer,
		int	fieldIndex,
		const QVariantMap &	config
	)		const

virtual

Create a cache for a given field.

This will be used in situations where a field is being represented various times in a loop. And will be passed to other methods on QgsFieldKit and QgsEditorWidgetWrapper.

For example, the attribute table will create a cache once for each field and then use this cache for representation. The QgsValueRelationFieldFormatter and QgsValueRelationEditorWidget implement this functionality to create a lookuptable once (a QVariantMap / dict) and are make use of a cache if present.

Since: QGIS 3.0

Reimplemented in QgsValueRelationFieldFormatter.

Definition at line 59 of file qgsfieldformatter.cpp.

virtual QString QgsFieldFormatter::id ( ) const

pure virtual

Returns a unique id for this field formatter.

This id will later be used to identify this field formatter in the registry with QgsFieldFormatterRegistry::fieldFormatter().

This id matches the id of a QgsEditorWidgetFactory.

Implemented in QgsValueRelationFieldFormatter, QgsValueMapFieldFormatter, QgsDateTimeFieldFormatter, QgsKeyValueFieldFormatter, QgsRelationReferenceFieldFormatter, QgsCheckBoxFieldFormatter, QgsListFieldFormatter, QgsFallbackFieldFormatter, and QgsRangeFieldFormatter.

QString QgsFieldFormatter::representValue	(	QgsVectorLayer *	layer,
		int	fieldIndex,
		const QVariantMap &	config,
		const QVariant &	cache,
		const QVariant &	value
	)		const

virtual

Create a pretty String representation of the value.

Returns: By default the string representation of the provided value as implied by the field definition is returned.

Since: QGIS 3.0

Reimplemented in QgsValueRelationFieldFormatter, QgsValueMapFieldFormatter, QgsDateTimeFieldFormatter, QgsKeyValueFieldFormatter, QgsRelationReferenceFieldFormatter, QgsCheckBoxFieldFormatter, QgsListFieldFormatter, and QgsRangeFieldFormatter.

Definition at line 23 of file qgsfieldformatter.cpp.

QVariant QgsFieldFormatter::sortValue	(	QgsVectorLayer *	layer,
		int	fieldIndex,
		const QVariantMap &	config,
		const QVariant &	cache,
		const QVariant &	value
	)		const

virtual

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

Returns: an unmodified value by default.

Since: QGIS 3.0

Reimplemented in QgsValueRelationFieldFormatter, QgsValueMapFieldFormatter, and QgsRelationReferenceFieldFormatter.

Definition at line 35 of file qgsfieldformatter.cpp.

The documentation for this class was generated from the following files:

/build/qgis-3.4.15+24xenial/src/core/qgsfieldformatter.h
/build/qgis-3.4.15+24xenial/src/core/qgsfieldformatter.cpp

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation