Class: QgsFieldFormatter¶
-
class
qgis.core.
QgsFieldFormatter
¶ Bases:
sip.wrapper
Default constructor
QgsFieldFormatter(
QgsFieldFormatter
)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.
Methods
Returns the alignment for a particular field.
Create a cache for a given field.
Returns a unique id for this field formatter.
Create a pretty String representation of the value.
If the default sort order should be overwritten for this widget, you can transform the value in here.
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alignmentFlag
(self, layer: QgsVectorLayer, fieldIndex: int, config: Dict[str, Any]) → Qt.AlignmentFlag¶ Returns the alignment for a particular field. By default this will consider the field type but can be overwritten if mapped values are represented.
New in version 3.0.
- Parameters
layer (QgsVectorLayer) –
fieldIndex (int) –
config (Dict[str) –
- Return type
Qt.AlignmentFlag
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createCache
(self, layer: QgsVectorLayer, fieldIndex: int, config: Dict[str, Any]) → Any¶ 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
andQgsEditorWidgetWrapper
.For example, the attribute table will create a cache once for each field and then use this cache for representation. The
QgsValueRelationFieldFormatter
andQgsValueRelationEditorWidget
implement this functionality to create a lookuptable once (a QVariantMap / dict) and are make use of a cache if present.New in version 3.0.
- Parameters
layer (QgsVectorLayer) –
fieldIndex (int) –
config (Dict[str) –
- Return type
Any
-
id
(self) → str¶ 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
.- Return type
str
-
representValue
(self, layer: QgsVectorLayer, fieldIndex: int, config: Dict[str, Any], cache: Any, value: Any) → str¶ Create a pretty String representation of the value.
- Return type
str
- Returns
By default the string representation of the provided value as implied by the field definition is returned.
New in version 3.0.
- Parameters
layer (QgsVectorLayer) –
fieldIndex (int) –
config (Dict[str) –
cache (Any) –
value (Any) –
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sortValue
(self, layer: QgsVectorLayer, fieldIndex: int, config: Dict[str, Any], cache: Any, value: Any) → Any¶ If the default sort order should be overwritten for this widget, you can transform the value in here.
- Return type
Any
- Returns
an unmodified value by default.
New in version 3.0.
- Parameters
layer (QgsVectorLayer) –
fieldIndex (int) –
config (Dict[str) –
cache (Any) –
value (Any) –
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