listenable library

listen and select on a Listenable, kept out of package:scopo/scopo.dart.

They are extensions on the framework's own Listenable, where another package is free to put a listen and a select of its own. Exported from the main import, they came with every scope: a file that also imported such a package found listen ambiguous, and its select silently replaced by this one, which is the more specific of the two. The import is the choice.

ListenableSelector, the widget built on select, stays in the main import: a widget's name collides with nothing in an extension.

Classes

CompositeListenableSubscription

Acts as a container for multiple subscriptions ListenableSubscription that can be canceled at once.

ListenableSelectSubscription<T extends Object?>

A subscription on selected value changes from a Listenable.

ListenableSubscription

A subscription on changes from a Listenable.

Extensions

ListenableListenExtension on Listenable

A helper extension that adds a listen method to Listenable, similar to Stream.listen. It returns a ListenableSubscription that can be easily canceled.

ListenableSelectExtension on L

A helper extension that adds a select method to Listenable. It allows listening to a specific value of the Listenable (selector), triggering the listener only when that value changes.