handleOnChanged method
Implementation
void handleOnChanged(BuildContext context, {required double value}) {
final knobsProvider = KnobsProvider.of(context);
final storyProvider = StoryProvider.of(context);
knobsProvider.knobStore.updateStoryKnobValue(
storyProvider.story.key,
knobKey: knobNode.key,
newValue: knobNode.value is double ? value : value.toInt(),
);
}