onActivate property
void Function()?
onActivate
final
Activation — Enter, Space, a click, or a semantic activate. Nothing
waits on work it starts, a semantic activation included: an error from
that work reaches the zone (runApp's error overlay), as a key's does.
Throwing SemanticActionDeclined declines the activation: a key or a
click then does nothing, and a semantic activation reports it
unsupported. Anything else it throws reports that activation failed.
Implementation
final void Function()? onActivate;