QGIS API Documentation  3.9.0-Master (224899f119)
Public Member Functions | Static Public Attributes | List of all members
QgsValueMapFieldFormatter Class Reference

Field formatter for a ValueMap field. More...

#include <qgsvaluemapfieldformatter.h>

Inheritance diagram for QgsValueMapFieldFormatter:
Inheritance graph
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Public Member Functions

 QgsValueMapFieldFormatter ()=default
 Default constructor of field formatter for a value map field. More...
 
QString id () const override
 Returns a unique id for this field formatter. More...
 
QString representValue (QgsVectorLayer *layer, int fieldIndex, const QVariantMap &config, const QVariant &cache, const QVariant &value) const override
 Create a pretty String representation of the value. More...
 
QVariant sortValue (QgsVectorLayer *layer, int fieldIndex, const QVariantMap &config, const QVariant &cache, const QVariant &value) const override
 If the default sort order should be overwritten for this widget, you can transform the value in here. More...
 
- Public Member Functions inherited from QgsFieldFormatter
 QgsFieldFormatter ()
 
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...
 

Static Public Attributes

static const QString NULL_VALUE = QStringLiteral( "{2839923C-8B7D-419E-B84B-CA2FE9B80EC7}" )
 Will be saved in the configuration when a value is NULL. More...
 

Detailed Description

Field formatter for a ValueMap field.

A value relation field formatter looks up the values a map.

The map is defined in the configuration as dictionary under the key "map".

{ "map": { 1: "one", 2: "two", 3: "three" } }

Values that are not on the map will be wrapped in parentheses. So with the above configuration:

Since
QGIS 3.0

Definition at line 39 of file qgsvaluemapfieldformatter.h.

Constructor & Destructor Documentation

◆ QgsValueMapFieldFormatter()

QgsValueMapFieldFormatter::QgsValueMapFieldFormatter ( )
default

Default constructor of field formatter for a value map field.

Member Function Documentation

◆ id()

QString QgsValueMapFieldFormatter::id ( ) const
overridevirtual

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.

Implements QgsFieldFormatter.

Definition at line 22 of file qgsvaluemapfieldformatter.cpp.

◆ representValue()

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

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 from QgsFieldFormatter.

Definition at line 27 of file qgsvaluemapfieldformatter.cpp.

◆ sortValue()

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

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 from QgsFieldFormatter.

Definition at line 61 of file qgsvaluemapfieldformatter.cpp.

Member Data Documentation

◆ NULL_VALUE

const QString QgsValueMapFieldFormatter::NULL_VALUE = QStringLiteral( "{2839923C-8B7D-419E-B84B-CA2FE9B80EC7}" )
static

Will be saved in the configuration when a value is NULL.

It's the magic UUID {2839923C-8B7D-419E-B84B-CA2FE9B80EC7}

Definition at line 47 of file qgsvaluemapfieldformatter.h.


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