open:sliver [EL]

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# Sliver

  - [[SliverAppBar]]
  - [[SliverToBoxAdaptor]]
  - [[SliverList]]
  - [[SliverFixedExtentList]]
  - [[SliverGrid]]
  - [[SliverGrid.extent]]
  - [[SliverGrid.count]]

## How to Slivers Work?

Widgets that we frequently use inside a Scaffold extend the abstract class [[RenderConstrainedBox]]. For example, Container, ListView, Text, etc. extend the abstract class [[RenderConstrainedBox]]

But we cannot use slivers directly in Scaffold. We will have to add a [[CustomScrollView]] which can hold an array of slivers. And these slivers extend the abstract class [[RenderSliver]].

In Flutter [[CustomScrollView]] is a type of scrollView which has a property named [[sliver]]s. This can hold an array of widgets that extend the abstract class [[RenderSliver]].

These widgets have some capabilities beyond those of simple widgets (widgets which extend RenderConstrainedBox) such as expanding and shrinking the app bar, control over the scroll effect, a widget with scrolling effect.

## Refs

- https://www.dltlabs.com/blog/how-do-you-use-slivers-in-flutter-180301