semanticFormatterCallback property
final
The callback used to create a semantic value from a slider value.
Defaults to formatting values as a percentage.
This is used by accessibility frameworks like TalkBack on Android to inform users what the currently selected value is with more context.
In the example below, a slider for currency values is configured to
announce a value with a currency label.
Slider(
value: _dollars.toDouble(),
min: 20.0,
max: 330.0,
label: '$_dollars dollars',
onChanged: (double newValue) {
setState(() {
_dollars = newValue.round();
});
},
semanticFormatterCallback: (double newValue) {
return '${newValue.round()} dollars';
}
)
Implementation
final SemanticFormatterCallback semanticFormatterCallback