functional_listener
library
Classes
-
CustomValueNotifier<T>
-
Sometimes you want a ValueNotifier where you can control when its
listeners are notified. With the
CustomValueNotifier
you can do this:
If you pass CustomNotifierMode.always for the mode parameter,
notifierListeners
will be called everytime you assign a value to the
value property independent of if the value is different from the
previous one.
If you pass CustomNotifierMode.manual for the mode parameter,
notifierListeners
will not be called when you assign a value to the
value property. You have to call it manually to notify the Listeners.
Aditionally it has a listenerCount property that tells you how many
listeners are currently listening to the notifier.
-
ListenableSubscription
-
Object that is returned by
listen
that allows you to stop the calling of the
handler that you passed to it.
Extensions
-
FunctionaListener
on ValueListenable<T>
-
extension functions on
ValueListenable
that allows you to work with them almost
as if it was a synchronous stream. Each extension function returns a new
ValueNotifier
that updates its value when the value of this
changes
You can chain these functions to build complex processing
pipelines from a simple ValueListenable
In the examples we use listen to react on value changes. Instead of applying listen you
could also pass the end of the function chain to a ValueListenableBuilder