Observer3<A, B, C> constructor
const
Observer3<A, B, C> ({})
Constructs an Observer3 widget.
The listenable parameter is the first reactive variable to listen to.
The listenable2 parameter is the second reactive variable to listen to.
The listenable3 parameter is the third reactive variable to listen to.
The listener parameter is a callback function that defines the widget to rebuild whenever any of the reactive variables changes.
Implementation
const Observer3({
Key? key,
required this.listenable,
required this.listenable2,
required this.listenable3,
required this.listener,
}) : super(key: key);