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. [...]