ScrollUpdateNotification class Null safety

A notification that a Scrollable widget has changed its scroll position.

See also:

  • OverscrollNotification, which indicates that a Scrollable widget has not changed its scroll position because the change would have caused its scroll position to go outside its scroll bounds.
  • ScrollNotification, which describes the notification lifecycle.


ScrollUpdateNotification({required ScrollMetrics metrics, required BuildContext context, DragUpdateDetails? dragDetails, double? scrollDelta, int? depth})
Creates a notification that a Scrollable widget has changed its scroll position.


context BuildContext?
The build context of the widget that fired this notification.
final, inherited
depth int
The number of viewports that this notification has bubbled through.
read-only, inherited
dragDetails DragUpdateDetails?
If the Scrollable changed its scroll position because of a drag, the details about that drag update.
hashCode int
The hash code for this object.
read-only, inherited
metrics ScrollMetrics
A description of a Scrollable's contents, useful for modeling the state of its viewport.
final, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
scrollDelta double?
The distance by which the Scrollable was scrolled, in logical pixels.


debugFillDescription(List<String> description) → void
Add additional information to the given description for use by toString.
dispatch(BuildContext? target) → void
Start bubbling this notification at the given build context.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
toString() String
A string representation of this object.


operator ==(Object other) bool
The equality operator.