addListener method
- void listener(
- T? newValue
Adds a listener to a list of listeners.
Implementation
void addListener(void Function(T? newValue) listener) {
if (_listeners?.contains(listener) ?? true) return;
_listeners?.add(listener);
}
Adds a listener to a list of listeners.
void addListener(void Function(T? newValue) listener) {
if (_listeners?.contains(listener) ?? true) return;
_listeners?.add(listener);
}