Fix nested listeners so that ancestor listeners can also receive enter/exit/move events.#32350
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jonahwilliams
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| Iterable<S> findAll<S>(Offset regionOffset) sync* { |
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TBH I really dislike sync*, it has very poor performance characteristics. On the other hand, it is a clear win getting to implement findAll in terms of find in a lazy manner
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Yeah, this was a tradeoff. It's an implementation detail, though, so we can change it to use lists or something if it turns out to hurt performance.
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…ive enter/exit/move events. (flutter#32350)" This reverts commit aeccd6a due to a performance regression.
This was referenced May 9, 2019
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Description
This changes
Listenerto trigger enter/move/exit in allListeners below the pointer, not just the leaf region (the first region hit). This is because we need to allow listeners to be nested so that, say, a widget that handles changing color on hover, but also is wrapped in aTooltip(that handles hover) can trigger both actions, not just one.To that end, I added a
findAlltoLayer, similar to the existingfindmethod that was previously used. It returns an iterator over annotated layers which match the given data type.Since the
findAllis implemented as returning an Iterable (and issync*), I re-implemented thefindroutines as just returning the first result fromfindAll, since that should be just as efficient, and would then prevent duplication in the implementation.Tests
I added the following tests:
findAllsimilar tofind, as well as extra tests having to do with returned order of results (which is leaf first, then ancestors).Listenerthat assure that nested listeners do the right thing.Checklist
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[x]). This will ensure a smooth and quick review process.///).flutter analyze --flutter-repo) does not report any problems on my PR.Breaking Change
Does your PR require Flutter developers to manually update their apps to accommodate your change?