UserScrollNotification class

A notification that the user has changed the ScrollDirection in which they are scrolling, or have stopped scrolling.

For the direction that the ScrollView is oriented to, and the direction contents are being laid out in, see AxisDirection & GrowthDirection.

This sample shows a CustomScrollView, with Radio buttons in the AppBar.bottom that change the AxisDirection to illustrate different configurations. With a NotificationListener to listen to UserScrollNotifications, which occur when the ScrollDirection changes or stops.
link

To create a local project with this code sample, run:
flutter create --sample=rendering.ScrollDirection.1 mysample

See also:

Inheritance

Constructors

UserScrollNotification({required ScrollMetrics metrics, required BuildContext context, required ScrollDirection direction})
Creates a notification that the user has changed the direction in which they are scrolling.

Properties

context → BuildContext?
The build context of the widget that fired this notification.
finalinherited
depth → int
The number of viewports that this notification has bubbled through.
no setterinherited
direction → ScrollDirection
The direction in which the user is scrolling.
final
hashCode → int
The hash code for this object.
no setterinherited
metrics → ScrollMetrics
A description of a Scrollable's contents, useful for modeling the state of its viewport.
finalinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

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

Operators

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