NotificationListener<T extends Notification> class
Null safety
A widget that listens for Notifications bubbling up the tree.
Notifications will trigger the onNotification callback only if their
runtimeType is a subtype of T
.
To dispatch notifications, use the Notification.dispatch method.
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- ProxyWidget
- NotificationListener
Constructors
-
NotificationListener({Key? key, required Widget child, NotificationListenerCallback<
T> ? onNotification}) -
Creates a widget that listens for notifications.
const
Properties
- child → Widget
-
The widget below this widget in the tree.
finalinherited
- hashCode → int
- The hash code for this object.
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
-
onNotification
→ NotificationListenerCallback<
T> ? -
Called when a notification of the appropriate type arrives at this
location in the tree.
final
- runtimeType → Type
-
A representation of the runtime type of the object.
read-onlyinherited
Methods
-
createElement(
) → Element -
Inflates this configuration to a concrete instance.
override
-
debugDescribeChildren(
) → List< DiagnosticsNode> -
Returns a list of
DiagnosticsNode
objects describing this node's children.protected">@protectedinherited -
debugFillProperties(
DiagnosticPropertiesBuilder properties) → void -
Add additional properties associated with the node.
inherited
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a non-existent method or property is accessed.
inherited
-
toDiagnosticsNode(
{String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode -
Returns a debug representation of the object that is used by debugging
tools and by DiagnosticsNode.toStringDeep.
inherited
-
toString(
{DiagnosticLevel minLevel = DiagnosticLevel.info}) → String -
A string representation of this object.
inherited
-
toStringDeep(
{String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String -
Returns a string representation of this node and its descendants.
inherited
-
toStringShallow(
{String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String -
Returns a one-line detailed description of the object.
inherited
-
toStringShort(
) → String -
A short, textual description of this widget.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
nonVirtual">@nonVirtualinherited