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Add semanticIndexOffset argument to SliverList.builder, SliverGrid.builder, and SliverFixedExtentList.builder #173019
Description
Use case
SliverList.builder/SliverGrid.builder/SliverFixedExtentList.builder are convenience constructors for SliverList/SliverGrid/SliverFixedExtentList with a SliverChildBuilderDelegate item delegate.
The SliverChildBuilderDelegate accepts a semanticIndexOffset argument:
SliverGrid(
gridDelegate: _gridDelegate,
delegate: SliverChildBuilderDelegate(
(BuildContext context, int index) {
return const Text('...');
},
childCount: 2,
semanticIndexOffset: 2,
),
),However, SliverList.builder, SliverGrid.builder, and SliverFixedExtentList.builder do not accept a semanticIndexOffset argument. If you need to provide this argument, you are forced to use the delegate pattern instead of the convenience constructor.
Proposal
- Add a
semanticIndexOffsetargument toSliverList.builder - Add a
semanticIndexOffsetargument toSliverGrid.builder - Add a
semanticIndexOffsetargument toSliverFixedExtentList.builder
For example:
SliverGrid.builder(
gridDelegate: _gridDelegate,
semanticIndexOffset: 2,
itemCount: 2,
itemBuilder: (BuildContext context, int index) {
return const Text('...');
},
),Metadata
Metadata
Assignees
Labels
Issues that are less important to the Flutter projectAccessibility, e.g. VoiceOver or TalkBack. (aka a11y)Nothing broken; request for a new capabilityA detailed proposal for a change to FlutterViewports, list views, slivers, etc.flutter/packages/flutter repository. See also f: labels.Issue is closed as already fixed in a newer versionOwned by Framework teamTriaged by Framework team
Activity
[-]Add semanticIndexOffset argument to SliverList.builder and SliverGrid.builder[/-][+]Add semanticIndexOffset argument to SliverList.builder, SliverGrid.builder, and SliverFixedExtentList.builder[/+]Migrate to list and builder Sliver convenience constructors (#173011)
Migrate to list and builder Sliver convenience constructors (flutter#…
Migrate to list and builder Sliver convenience constructors (flutter#…
rodrigogmdias commentedon Sep 3, 2025
loic-sharma commentedon Sep 4, 2025
@rodrigogmdias We assign pull request reviewers in our weekly triage meetings. Please don't ping folks directly for reviews as that just adds noise :)
Add semanticIndexOffset argument to SliverList.builder, SliverGrid.bu…
Add semanticIndexOffset argument to SliverList.builder, SliverGrid.bu…
Migrate to list and builder Sliver convenience constructors (flutter#…
Add semanticIndexOffset argument to SliverList.builder, SliverGrid.bu…
Migrate to list and builder Sliver convenience constructors (flutter#…
justinmc commentedon Sep 23, 2025
Fixed with #174856
Add semanticIndexOffset argument to SliverList.builder, SliverGrid.bu…
github-actions commentedon Oct 8, 2025
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flutter doctor -vand a minimal reproduction of the issue.