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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.
Reacted by xubaolin, Shashi Kiran R, Ahmed Elsayed, Jan Budař, Wahab Alshahin, SmartVive, Khaled, ManifoldWanderer, Oleh Treskot, Hitesh Kumar Saini and 3 more
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
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