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AdoptAWidget: SliverWithKeepAliveWidget (#69470) (#69557)

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Chintan Patel 2020-11-02 15:23:02 +05:30 committed by GitHub
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packages/flutter/lib/src/widgets/sliver.dart
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@ -746,6 +746,15 @@ class SliverChildListDelegate extends SliverChildDelegate {
} }
/// A base class for sliver that have [KeepAlive] children. /// A base class for sliver that have [KeepAlive] children.
///
/// See also:
///
/// * [KeepAlive], which marks whether its chlild widget should be kept alive.
/// * [SliverChildBuilderDelegate] and [SliverChildListDelegate], slivers
/// which make usr of the keep alive functionality through the
/// `addAutomaticKeepAlives` property.
/// * [SliverGrid] and [SliverList], two sliver widgets that are commonly
/// wrapped with [KeepAlive] widgets to preserve their sliver child subtrees.
abstract class SliverWithKeepAliveWidget extends RenderObjectWidget { abstract class SliverWithKeepAliveWidget extends RenderObjectWidget {
/// Initializes fields for subclasses. /// Initializes fields for subclasses.
const SliverWithKeepAliveWidget({ const SliverWithKeepAliveWidget({