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WIP: Support dynamic CSS values in the UI #38096

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@stacimc stacimc commented Jan 20, 2022

Description

🚧 Extremely early WIP 🚧

At the moment I'm just using this branch to play around with various approaches for a CustomUnitControl, using the Spacer block to test it out. The purpose is to add support in the UI for complex use cases like the one described here:

The main use case I have in mind is this space beneath the header in Twenty Twenty-Two. I'd love to use a spacer to replace that, but to keep it in sync with other areas of the theme we currently use a max(1.25rem, 5vw) value so that the space isn't too large on small screens.

Values that accept custom units (like padding, margin, and the Spacer block's height as referenced in that example) can technically support dynamic values, but the UI doesn't provide a way to see or edit those values. (You can manually edit the attribute in the Code editor, for example).

ToDo:

  • Play around with adding custom value support to the existing UnitControl instead, toggled on via a prop, so that it can potentially be used in the BoxControl as well
  • Handling of invalid custom css
  • Edge cases, for example if you type "100" in the Custom input, because this is a string it will not automatically be interpreted as 100px
custom-unit-control.mov

How has this been tested?

Screenshots

Types of changes

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.
  • 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).
  • I've updated related schemas if appropriate.

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Size Change: +374 B (0%)

Total Size: 1.13 MB

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@stacimc stacimc self-assigned this Jan 22, 2022
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stacimc commented Jan 22, 2022

This will be completely rewritten to add the (optional) functionality to the existing UnitControl instead of creating a new component. What's committed is left up so there's something to play around with.

Before this gets too far into the weeds, though, I'd love to get some design feedback. The button I'm using to toggle between the normal dropdown and the custom text input leaves a lot to be desired -- it takes up a lot of space and I had trouble coming up with a label to toggle off:

Default view Custom css view
Screen Shot 2022-01-21 at 4 29 08 PM Screen Shot 2022-01-21 at 4 36 49 PM

We could also use a smaller toggle like this one that's used by the Font Size picker:

Screen Shot 2022-01-21 at 4 33 16 PM

Or even make a "custom unit" and adding it to the dropdown as *, and allowing text input when selected.

@shaunandrews @jasmussen Do you have any ideas about how this should look? Especially in the context of the BoxControl, where the design could easily get very cluttered.

@stacimc stacimc added Needs Design Feedback Needs general design feedback. [Feature] Design Tools Tools that impact the appearance of blocks both to expand the number of tools and improve the experi labels Jan 22, 2022
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Thanks for working on this. Definitely a tricky one.

Just to understand correctly, themes like TT2 have some complex unit definitions in patterns, such as a font size of clamp(3rem, 6vw, 4.5rem), but in the UI it just shows up as custom and empty:
Screenshot 2022-01-25 at 10 31 48

Is that the problem you're solving for?

In that case, would something like the following be possible?
Screenshot 2022-01-25 at 10 34 39

That is, add "Custom CSS" as an option in the unit dropdown.

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