didChange method

bool didChange({
  1. IndicatorState? from,
  2. IndicatorState? to,
})
  • When from and to are provided - returns true when state did change from to to.
  • When only from is provided - returns true when state did change from from.
  • When only to is provided - returns true when state did change to to.
  • When from and to equals null - returns true for any state change.

Implementation

bool didChange({IndicatorState? from, IndicatorState? to}) {
  final stateChanged = currentState != newState;
  if (to == null && from != null) return currentState == from && stateChanged;
  if (to != null && from == null) return newState == to && stateChanged;
  if (to == null && from == null) return stateChanged;
  return currentState == from && newState == to;
}