ScrollController Explained | Flutter for Web Developers

What’s ScrollController?

ScrollController class Controls a scrollable widget.

Check the official documentation for more.

ScrollController explained for Web Developers

Scroll controllers are typically stored as member variables in State objects and are reused in each State.build. A single scroll controller can be used to control multiple scrollable widgets, but some operations, such as reading the scroll offset, require the controller to be used with a single scrollable widget. This is somewhat similar to how state management works in frameworks like React, Angular, and Vue, where a single state can influence multiple components, but with the added complexity of managing scroll positions.

Example Code

Here is an example of how to use ScrollController:

flutter create --sample=cupertino.ScrollPosition.1 mysample

ScrollController Remarks

To listen to changes in scroll metrics, use a NotificationListener of type ScrollMetricsNotification.