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[6/n] Native Typeahead - Refactor focusAndUpdateText and add focusAndUpdateTextAndSelection
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Authored by przemek on Jan 24 2023, 1:13 PM.
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Details

Summary

Preparing for native typeahead.
Refactored utility funtion used for focusing text input and introduced new function that will be used in typeahead. Common part was extrated to focusAndHandleButtons.

Test Plan

Checked if app builds.
Tested if focusing on reply still works correctly.
focusAndUpdateTextAndSelection tested in future diffs when it's actually used.

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Event Timeline

tomek requested changes to this revision.Jan 30 2023, 3:24 AM
tomek added inline comments.
native/chat/chat-input-bar.react.js
648–654 ↗(On Diff #21272)

Maybe we should call updateText function?

669 ↗(On Diff #21272)

We can be more specific here, as handle sounds ambiguous.

675–676 ↗(On Diff #21272)

In the previous implementation we were calling these conditionally. Now we're calling them every time focusAndUpdateText is called. Is that intentional? Is it correct to do so?

This revision now requires changes to proceed.Jan 30 2023, 3:24 AM
przemek marked 3 inline comments as done.

Responding to review and introducing hack allowing us for correct selection after typeahead is clicked.

native/chat/chat-input-bar.react.js
648–654 ↗(On Diff #21272)

Right now the context is a bit different and updateText has some code responsible for setting flags in refs, so I think sticking to setting state here is simpler.

675–676 ↗(On Diff #21272)

It allows us to use focusAndHandleButtons and it doesn't create any significant difference in how it looks like. We hide buttons when text input is focused anyway

Going with sleep(100), waiting for animation flash was unreliable and undeterministic.

native/chat/chat-input-bar.react.js
729 ↗(On Diff #21732)

This comment needs to be updated – we're no longer waiting for the animation frame to flush

Fixed comment.
Also changed control selection to false in first setState.
Previously it was set to true, but it didn't affect app behaviour really.
This way it matches comment.

Sorry for that, something hasn't refreshed properly apparently.
We need controlSelection set to true in first setter as that's what Android uses.
Tested on iOS and it doesn't affect behaviour.

tomek requested changes to this revision.Feb 2 2023, 4:40 AM
tomek added inline comments.
native/chat/chat-input-bar.react.js
734–748

Two things worry me here:

  1. We're setting controlSelection to true and then, after 100ms, again to true. Is that intentional? Do we expect that it might be updated to false in the meantime?
  2. We're sleeping and then setting the state regardless of other events. I'm wondering if it is possible that something can happen that would make us not wanting to update the selection? E.g. what if quickly after updating text a selection is updated? Are we going to override it?

It feels like we should consider using a timeout here and canceling it if appropriate, but I'm not sure.

This revision now requires changes to proceed.Feb 2 2023, 4:40 AM

Fixing and responding to reviewer

Small fix. Rebase and moved comment around.

przemek added inline comments.
native/chat/chat-input-bar.react.js
734–748
  1. We need second selection to true, as it could be set to false in a meantime by selection events (the same events that made us go with this hack.)
  2. Yes, we're going to override is. I experimented and tested a lot, but was unable to create such situation as a user.

I went with a timeout you suggested and refactored it all into the separate function as it feels cleaner.
We could "refresh" timeout every time selection is changed after it was set but it would require even more refs and messy code, and to be honest it is hard to justify for me. I feel like we shouldn't write code to deal with something that is already hacky. We have task to fix the issue: https://linear.app/comm/issue/ENG-2892/native-typeahead-fix-selection-flicker-on-ios-after-choosing-user-in#comment-1aa9903f
Maybe someday TextInput gets better or we find better solution, or we try to create custom native TextInput ourselves.

tomek added a reviewer: ashoat.
This revision is now accepted and ready to land.Feb 6 2023, 5:50 PM