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Navigator: hide scrollbars while animating #35317

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ciampo
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@ciampo ciampo commented Oct 4, 2021

Description

This PR builds on top of #35214 and proposes a fix for the issue raised in #34904 (review) about the scrollbars appearing during screen animations.

The proposed solution applies the overflow: hidden styles on the NavigatorProvider wrapper only while screens are animating (which addresses the concerns expressed in #35214 (comment)).

The main changes are:

  • refactoring the shape of NavigatorContext from array to object, in order to include the isAnimating/setInsAnimating props.
  • using the isAnimating/setInAnimating props, apply the overflow: hidden styles to the wrapper div only while an animation is in progress.
  • update the Storybook example to include a modal Flyout to show that the overflow rule doesn't affect modals

How has this been tested?

Screenshots

Before

navigator-scrollbars.mp4

After

Kapture.2021-10-04.at.12.32.46.mp4

Types of changes

Bug fix

Checklist:

  • My code is tested.
  • My code follows the WordPress code style.
  • My code follows the accessibility standards.
  • I've tested my changes with keyboard and screen readers.
  • My code has proper inline documentation.
  • I've included developer documentation if appropriate.
  • N/A I've updated all React Native files affected by any refactorings/renamings in this PR (please manually search all *.native.js files for terms that need renaming or removal).

@ciampo ciampo added [Type] Bug An existing feature does not function as intended [Package] Components /packages/components [Feature] Component System WordPress component system labels Oct 4, 2021
@ciampo ciampo self-assigned this Oct 4, 2021

return {
push( path, options ) {
setPath( { path, ...options } );
setIsAnimating( true );
setNavigatorPath( { path, ...options } );
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This approach seems to work better than using the onAnimationStart callback on the motion.div component:

  • in my tests, the onAnimationStart callback would fire after the animation starts, which caused the scrollbars to still appear from time to time (depending on the browser rendering loop)
  • setting isAnimating to true in the push function ensures that the flag is applied before the animation starts

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Size Change: +113 B (0%)

Total Size: 1.07 MB

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This works well but I'm not sure it wouldn't be better to simply add overflow-x: hidden unconditionally to the root of the component.

Base automatically changed from feat/components-navigator-typescript-refactor to trunk October 5, 2021 15:13
@ciampo ciampo force-pushed the fix/components-navigator-remove-scrollbars-while-transitioning branch from d0e3e85 to 0c21e52 Compare October 5, 2021 15:56
@ciampo ciampo force-pushed the fix/components-navigator-remove-scrollbars-while-transitioning branch from 0c21e52 to 5a17e72 Compare October 5, 2021 16:08
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ciampo commented Oct 5, 2021

Addressed the initial round of feedback and rebase on top of trunk after #35214 got merged

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ciampo commented Oct 5, 2021

Hey @youknowriad @diegohaz @mirka @ntsekouras and @jorgefilipecosta, I'd love to hear your opinion about the approach taken in this PR and how it compares against #35332.

  • Hide horizontal overflow in Navigator #35332 offers a simpler solution by always applying overflow-x: hidden — which doesn't seem to cause issues with modals if they render to a separate DOM node on top of the Navigator component (e.g. via portals)
  • This PR offers a more elaborate solution, by applying overflow: hidden only while the animation is happening — although it introduces more code and complexity.

What do you think? We could, for example, opt for the simpler solution #35332 and come up with a more elaborate solution only if necessary

@ciampo ciampo requested review from mirka and diegohaz October 5, 2021 17:13
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mirka commented Oct 6, 2021

The advantage I see here is less about popovers (they should be portal'ed anyway like @stokesman says in #35332 (comment)), but in scenarios where the consumer inadvertently causes x-overflows with naive CSS and dynamic content (translations, tables, etc). This isn't an uncommon occurrence, so in those cases I would want the overflow to be at least scrollable. I find the slightly added complexity to be an acceptable trade off for that tolerance.

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ciampo commented Oct 6, 2021

I find the slightly added complexity to be an acceptable trade off for that tolerance.

That is a fair point. @stokesman has updated #35332 to potentially address this issue as well.

With regards on how to proceed, I'm happy with both solutions (given that they solve the issue equally well). I'm happy to follow whatever decision is made here.

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ciampo commented Oct 7, 2021

Let's go with #35332 for now

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