addListener method

  1. @override
bool addListener(
  1. K key,
  2. VoidCallback listener
)
override

Returns true if key was not already used for another listener.

If another listener was previously associated with key, then the only one gets replaced with listener and false gets returned.

Implementation

@override
bool addListener(K key, VoidCallback listener) =>
    _addListener(key, _Listener(listener));