feat: foundation for sticky headers

superlistapp / super_sliver_list

Drop-in replacement for SliverList and ListView that can handle large amount of items with variable extents and reliably jump / animate to any item.

MIT License

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Closed knopp closed 6 months ago

knopp commented 6 months ago

This PR introduces

extension on SliverGeometry that allows specifying child obstruction extent
extension on RenderAbstractViewport with getOffsetToRevealExt method that provides offset to reveal that takes the obstruction extent into account.

These should be enough to allow for implementing of sticky header sliver that works properly with the jumpTo/animateToItem calls.