useListenableSelector<R> function

R useListenableSelector<R>(Listenable? listenable, R selector())

Rebuild only when there is a change in the selector result.

The following example showcases If no text is entered, you will not be able to press the button.

class Example extends HookWidget {
  @override
  Widget build(BuildContext context) {
   final listenable = useTextEditingController();
   final bool textIsEmpty =
        useListenableSelector(listenable, () => listenable.text.isEmpty);
   return Column(
      children: [
        TextField(controller: listenable),
        ElevatedButton(
            // If no text is entered, the button cannot be pressed
            onPressed: textIsEmpty ? null : () => print("Button can be pressed!"),
            child: Text("Button")),
      ],
    );
  }
}

Implementation

R useListenableSelector<R>(
  Listenable? listenable,
  R Function() selector,
) {
  return use(_ListenableSelectorHook(listenable, selector));
}