activeColor property Null safety
final
The color to use for the portion of the slider track that is active.
The "active" side of the slider is the side between the thumb and the minimum value.
Defaults to SliderThemeData.activeTrackColor of the current SliderTheme.
Using a SliderTheme gives much more fine-grained control over the appearance of various components of the slider.
Implementation
final Color? activeColor;