TextField Input Debouncing

debounce.dart

// declare variable at the top inside class
Timer _debounce;
Duration _debounceDuration = Duration(seconds: 1);

// initState
@override
void initState() {
  super.initState();

  // add listener to textfield controller
  _searchController.addListener(onSearchChanged);
}

// on change function
void onSearchChanged() {
  if (_debounce?.isActive ?? false) _debounce.cancel();
    _debounce = Timer(_debounceDuration, () {
      // TODO : DO SOMETHING
    });
}

@override
void dispose() {
  controller.removeListener(listControllerCallback);
  _searchController.removeListener(listControllerCallback);
  _searchController.dispose();
  super.dispose();
}