signalValueLookup property
Optional callback to look up a signal's value by wire name.
Override in subclass (e.g., EmbeddedSchematicViewer) to provide
snapshot values from the parent application. When non-null, the hover
tooltip shows the value on a second line beneath the wire name.
Returns null by default (standalone mode — no value lookup).
Implementation
@protected
({String value, bool computed, String signalId})? Function(String wireName)?
get signalValueLookup => null;