ValueListener<T> constructor
const
ValueListener<T> ({})
Creates a ValueListener.
The parameters onValueChanged and child must not be null.
Implementation
const ValueListener({
Key? key,
required this.value,
required this.onValueChanged,
EqualityComparer<T>? equalityComparer,
required this.child,
}) : equalityComparer = equalityComparer ?? _defaultEqualityComparer,
super(key: key);