watchSignal<T> function
Watch a signal value and rebuild the context of the Element if mounted and mark it as dirty
Implementation
T watchSignal<T>(
BuildContext context,
ReadonlySignal<T> signal, {
String? debugLabel,
}) {
final ctx = context;
if (ctx.widget is Watch) return signal.value;
if (ctx is StatefulElement) {
final state = ctx.state;
if (state is SignalsMixin) {
return state.watchSignal(signal);
}
}
if (ctx is Element) {
final key = ctx.hashCode;
if (_elementRefs[key] == null) {
final label = [
'widget',
ctx.widget.runtimeType.toString(),
ctx.widget.hashCode.toString(),
].join('=');
final watcher = ElementWatcher(
key,
label,
WeakReference(ctx),
);
_elementRefs[key] = watcher;
_removeSignalWatchers();
}
_elementRefs[key]?.watch(signal);
}
// Grab the current value without subscribing
return signal.peek();
}