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# Objective - Working with hierarchies in Bevy is far too tedious due to a lack of helper functions. - This is the first half of #15609. ## Solution Extend [`HierarchyQueryExt`](https://docs.rs/bevy/latest/bevy/hierarchy/trait.HierarchyQueryExt) with the following methods: - `parent` - `children` - `root_parent` - `iter_leaves` - `iter_siblings` - `iter_descendants_depth_first` I've opted to make both `iter_leaves` and `iter_siblings` collect the list of matching Entities for now, rather that operate by reference like the existing `iter_descendants`. This was simpler, and in the case of `iter_siblings` especially, the number of matching entities is likely to be much smaller. I've kept the generics in the type signature however, so we can go back and optimize that freely without a breaking change whenever we want. ## Testing I've added some basic testing, but they're currently failing. If you'd like to help, I'd welcome suggestions or a PR to my PR over the weekend <3 --------- Co-authored-by: Viktor Gustavsson <villor94@gmail.com> Co-authored-by: poopy <gonesbird@gmail.com> Co-authored-by: Christian Hughes <9044780+ItsDoot@users.noreply.github.com> |
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Bevy Hierarchy
