WatcherRef class abstract

A reference object that enables support for watching Listenables within a Widget.

A WatcherRef is always associated with a particular WatcherWidget (or WatcherMixin / StatefulWatcherMixin), and is only valid within the build method of that Widget.

See also:

• WatcherContext, a BuildContext subclass that implements WatcherRef.

Implementers

• WatcherContext

Constructors

WatcherRef()

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

watch(Listenable listenable) → void

Watches the given listenable (i.e. Listenable.addListener) and rebuilds the widget whenever it notifies its listeners.

Operators

operator ==(Object other) → bool

The equality operator.

inherited