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Add itemExtentBuilder to ListView.separated #138758
Description
Is there an existing issue for this?
- I have searched the existing issues
- I have read the guide to filing a bug
Use case
For me, and I'm sure a lot of other developers, using ListView.separated is pretty common. I use its separatorBuilder to provide a SizedBox of a fixed height in between my fixed-height items and the itemBuilder to build said items. I was pretty happy to see #131393 get merged into the framework, but I was disappointed to see it wasn't in ListView.separated. The widgets that they build are of two possible extents, depending on whether the index is even or not and I think that'd be a perfect case for itemExtentBuilder.
Proposal
My proposal is to add the ability to use itemExtentBuilder in the ListView.separated constructor.
Activity
Mairramer commentedon Aug 31, 2026
That makes sense. I needed this the other day and noticed it wasn't available. It may not be that common, but it's definitely useful when you need it.
Add itemExtentBuilder support to ListView.separated (flutter#191157)
github-actions commentedon Sep 21, 2026
This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of
flutter doctor -vand a minimal reproduction of the issue.