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What?

Updates the BorderBoxControl such that when it contains "mixed" border values, it maintains the most common unit selection when switching back to the "linked" view.

Why?

Having the "linked" control display 'px' as the selected unit when split borders might all be using different CSS units is confusing. This PR brings it more in line with the box control while still maintaining the border control specific behaviour.

How?

  • Updates the getCommonBorder util to return a "CSS unit-only" value for mixed widths so the UnitControl maintains an appropriate unit selection.
  • Adds additional unit tests for related unit selection

Testing Instructions

  1. Run BorderBoxcontrol unit tests: npm run test:unit packages/components/src/border-box-control/test
  2. Fire up Storybook and visit the BorderBoxControl page.
  3. Unlink the control and set two or more fields to the same unit and the remaining fields to a different unit.
  4. Re-link the control, and the unit selected should be the one set multiple times in the previous step.
  5. Unlink the control again and make each field have a different unit. Re-link again, and the selected unit should be the first unit, i.e. the top border's unit. (the first defined unit is used in the case of multiple mode values)

Screenshots or screencast

Before After
Screen.Recording.2022-09-29.at.3.37.15.pm.mp4
Screen.Recording.2022-09-29.at.3.45.46.pm.mp4

@aaronrobertshaw aaronrobertshaw added [Type] Bug An existing feature does not function as intended [Feature] UI Components Impacts or related to the UI component system [Package] Components /packages/components labels Sep 29, 2022
@aaronrobertshaw aaronrobertshaw self-assigned this Sep 29, 2022
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Size Change: +266 B (0%)

Total Size: 1.27 MB

Filename Size Change
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@ciampo ciampo left a comment

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Changes LGTM and test well as per instructions — also extra kudos for the additional unit tests!

My only doubt in terms of UX is the discrepancy in the logic when the controls are re-linked:

  • we make an opinionated choice for the unit
  • we keep the width and the style "mixed"

Also, Since BorderBoxControl's logic looks very similar to the one in BoxControl, BorderRadiusControl (in the @wordpress/components package) and SpacingSizesControl (in the @wordpress/block-editor package), are these changes something that should be applied to those components as well?

Not for this PR, but @mirka and I had already discussed with @glendaviesnz about working on a base component that can abstract the common parts that these components share. It would be great if we could start planning for that too

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Thanks for the review @ciampo 👍

My only doubt in terms of UX is the discrepancy in the logic when the controls are re-linked:

  • we make an opinionated choice for the unit
  • we keep the width and the style "mixed"

I had similar doubts as well but if we are to keep the unit select around when the control has mixed values, this PR's approach felt the most natural to me.

If the user has gone to the trouble of setting non-px units, it's a little annoying to switch back to the linked view and go to "unify" the border widths but have to reselect the unit again because it was set to px. Also, it could be confusing to have set the units for each side, then switch back to the linked view and see a unit that doesn't relate to any of the side borders you just configured.

All that said, I'm happy to adjust it in a follow-up if anyone has a better option.

It is also worth noting that the potential removal of the unit select when the control has mixed values was floated in #41860. In that PR, I'm trying to increase the border controls to 40px in height. The increased padding that comes with that size variant means we no longer have space for the 'Mixed' placeholder, for example. Removing the unit select in that situation would free up some real estate. For this component, it would also then make the unit "mixed" as per width value, color, and style.

are these changes something that should be applied to those components as well?

I believe those components already maintain the most common unit as the selected unit when they have mixed values.

Not for this PR, but @mirka and I had already discussed with @glendaviesnz about working on a base component that can abstract the common parts that these components share. It would be great if we could start planning for that too

Agreed. I had those same discussions with Glen when he started out on the spacing presets UI. I'll happily take a run at it once I have the bandwidth if no one else has already picked it up.

@aaronrobertshaw aaronrobertshaw merged commit 4e0936c into trunk Sep 29, 2022
@aaronrobertshaw aaronrobertshaw deleted the fix/border-box-control-most-common-unit-selection branch September 29, 2022 11:28
@github-actions github-actions bot added this to the Gutenberg 14.3 milestone Sep 29, 2022
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ciampo commented Sep 29, 2022

For sure this bit of UX is tricky, happy to iterate in the future as we keep using this component and gaining more insights

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