refactor(aria/tree): create tree behavior #32569
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wagnermaciel
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Dec 18, 2025
wagnermaciel
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- Create a new Tree behavior and refactor the Tree UI Pattern to use it.
ok7sai
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Is this the prework for migrating menu to use the tree behavior?
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@ok7sai Yep 👍🏽 |
| * The list of items to navigate through. | ||
| * Defaults to the list of items from the inputs. | ||
| */ | ||
| items?: T[]; |
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The items override feels a bit weird, because whether an override is provided or not, the moving index is always based on the activeIndex from the original input, and the following case becomes hard to reason out.
- ListNavigation is initiated with items A, and an active index of A.
- Navigation happens and a different items B is provided.
- Some logic internally handles the mismatch between active index of A and the items B.
This last part is implicit and not easy to observe.
This makes me think about maybe ListNavigation behavior should just be a set of utility methods, and each method always take all necessary informations (items, activeIndex, wrap, etc.)
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I don't think ListNavigation should be a set of utility methods since it would require a lot of args in order to perform its operations. Either way, this is outside the scope of this PR.
This strange behavior can be replicated by changing the inputs.items currently. We could prevent this misuse of the behavior with some strict checks that warn or error if these come up. I think we are over-anticipating future concerns that I'm not convinced we will actually encounter
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* Create the new Tree Behavior class. * Refactor the existing Tree Pattern class to use the new behavior.
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* Create the new Tree Behavior class. * Refactor the existing Tree Pattern class to use the new behavior. (cherry picked from commit 21650a6)
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