ScrollView class abstract

A widget that combines a Scrollable and a Viewport to create an interactive scrolling pane of content in one dimension.

Scrollable widgets consist of three pieces:

1. A Scrollable widget, which listens for various user gestures and implements the interaction design for scrolling.
2. A viewport widget, such as Viewport or ShrinkWrappingViewport, which implements the visual design for scrolling by displaying only a portion of the widgets inside the scroll view.
3. One or more slivers, which are widgets that can be composed to created various scrolling effects, such as lists, grids, and expanding headers.

ScrollView helps orchestrate these pieces by creating the Scrollable and the viewport and deferring to its subclass to create the slivers.

To learn more about slivers, see CustomScrollView.slivers.

To control the initial scroll offset of the scroll view, provide a controller with its ScrollController.initialScrollOffset property set.

Persisting the scroll position during a session

Scroll views attempt to persist their scroll position using PageStorage. This can be disabled by setting ScrollController.keepScrollOffset to false on the controller. If it is enabled, using a PageStorageKey for the key of this widget is recommended to help disambiguate different scroll views from each other.

See also:

• ListView, which is a commonly used ScrollView that displays a scrolling, linear list of child widgets.
• PageView, which is a scrolling list of child widgets that are each the size of the viewport.
• GridView, which is a ScrollView that displays a scrolling, 2D array of child widgets.
• CustomScrollView, which is a ScrollView that creates custom scroll effects using slivers.
• ScrollNotification and NotificationListener, which can be used to watch the scroll position without using a ScrollController.
• TwoDimensionalScrollView, which is a similar widget ScrollView that scrolls in two dimensions.