NotificationListener<T extends Notification> class

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

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.
no setterinherited
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.
no setterinherited

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.
inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent 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.
inherited