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[WIP] Unit Control: Allow custom values with more specificity than step value #33156

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andrewserong
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Description

Following on from comments in #32481, this PR is an attempt to allow the user to enter values into a UnitControl field with greater specificity than the step value allows.

For example, if the step value for em units is 0.01 by default then even though dragging the values will do so in increments of 0.01, a user should be able to manually enter 1.123em without it being rounded to 1.12. Or at least, that's the premise behind this PR!

At the moment, this PR doesn't quite work right — we're grabbing the real value from within the unitControlStateReducer and setting the step value accordingly. This seems to work okay once the UnitControl component re-renders, however because we're using a ref, updating its value doesn't trigger a re-render. And unfortunately, we can't swap this out for a setState call instead, because this function is called within a child component, and we can't trigger a render on a parent component during the render of a child component.

So, at the moment, we have a situation where this PR kind of works the second time that a user goes to commit their value, at which point the UnitControl component is re-rendered and passes down the correct step value.

How has this been tested?

  • Add a Group block to a post, and attempt to enter a value with more specificity than 0.01em, e.g. try 1.123em.
  • After a couple of goes, this should allow you to enter a more specific value manually, however it's currently a bit unreliable.

Screenshots

Note in this screenshot that the first time we enter the more specific value it gets rounded to 2.23 (when enter is pressed), but the second time, the more specific value is preserved 2.234:

unit-control-specific-value

Types of changes

New feature

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).

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Size Change: +154 B (0%)

Total Size: 1.05 MB

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compressed-size-action

@@ -50,9 +51,17 @@ function UnitControl(
initial: initialUnit,
} );

const activeUnit = useMemo(
() => units.find( ( option ) => option.value === unit ),
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Note to self: use optional chaining here as units might not be defined.

@andrewserong
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I'll close this one out now, as a better solution has been proposed in #34542 which will allow an explicit any step value to be used when we'd like to support ultra-specific values.

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