Notification class
A notification that can bubble up the widget tree.
You can determine the type of a notification using the is operator to
check the runtimeType of the notification.
To listen for notifications in a subtree, use a NotificationListener.
To send a notification, call dispatch on the notification you wish to send. The notification will be delivered to any NotificationListener widgets with the appropriate type parameters that are ancestors of the given BuildContext.
Constructors
- Notification()
-
Abstract const constructor. This constructor enables subclasses to provide
const constructors so that they can be used in const expressions.
const
Properties
- hashCode → int
-
The hash code for this object. [...]
read-only, inherited
- runtimeType → Type
-
A representation of the runtime type of the object.
read-only, inherited
Methods
-
debugFillDescription(
List< String> description) → void -
Add additional information to the given description for use by toString. [...]
@mustCallSuper, @protected
-
dispatch(
BuildContext target) → void - Start bubbling this notification at the given build context. [...]
-
toString(
) → String -
Returns a string representation of this object.
override
-
visitAncestor(
Element element) → bool -
Applied to each ancestor of the dispatch target. [...]
@mustCallSuper, @protected
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a non-existent method or property is accessed. [...]
inherited
Operators
-
operator ==(
dynamic other) → bool -
The equality operator. [...]
inherited