onChangeStart property
Called when the user starts selecting new values for the slider.
This callback shouldn't be used to update the slider values
(use
onChanged for that). Rather, it should be used to be notified when the
user has started selecting a new value by starting a drag or with a tap.
The values passed will be the last values
that the slider had before the
change began.
- onChangeEnd for a callback that is called when the value change is complete.
Implementation
final ValueChanged<RangeValues>? onChangeStart;