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Post Editor: Support keyboard resizing of meta boxes pane #65325

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merged 9 commits into from
Sep 18, 2024

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stokesman
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@stokesman stokesman commented Sep 13, 2024

What?

A follow up to #64351 adding keyboard support to resize the meta box pane.

Why?

a11y

How?

Implements a custom resize handle with role="separator", aria-valuenow, aria-label and aria-describedby attributes.

Testing Instructions

Testing Instructions for Keyboard

Screenshots or screencast

keyboard-resize-meta-box.mp4

@stokesman stokesman added [Type] Task Issues or PRs that have been broken down into an individual action to take [Focus] Accessibility (a11y) Changes that impact accessibility and need corresponding review (e.g. markup changes). [Package] Edit Post /packages/edit-post labels Sep 13, 2024
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github-actions bot commented Sep 13, 2024

Size Change: +1.38 kB (+0.08%)

Total Size: 1.77 MB

Filename Size Change
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compressed-size-action

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Thanks for the PR! It's great that editor notices are taken into account.

So far, I've noticed two things:


  1. aria-valuenow doesn't seem to update properly in my environment:
523dbb1ce705ab0a6626304830051575.mp4

  1. I'm thinking about avoiding the use of ref.current as much as possible and making use of React state and ResizableBox props. The following is a very simplified example, but at least the height of the ResizableBox component and the value of aria-valuenow might be managed without referencing ref. Then, we might be able to delete resizableBoxRef and separatorRef.
Code example
function MetaBoxesMain( { isLegacy } ) {
	const [ boxHeight, setBoxHeight ] = useState( openHeight );
	const [ ariaValueNow, setAriaValueNow ] = useState( openHeight );

	return (
		<ResizableBox
			defaultSize={ { height: boxHeight, width: 'auto' } }
			size={ { height: boxHeight, width: 'auto' } }
			onResize={ ( event, direction, elementRef, delta ) => {
				setBoxHeight( elementRef.offsetHeight );
				setAriaValueNow( getAriaValueNow( elementRef.offsetHeight, max ) );
			} }
			onResizeStop={ () => {
				setBoxHeight( boxHeight );
				setPreference(
					'core/edit-post',
					'metaBoxesMainOpenHeight',
					boxHeight
				);
			} }
		>
			{ contents }
		</ResizableBox>
	);
}
---

I haven't yet figured out all the logic of the code, so please let me know if I'm misunderstanding anything 🙏

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@stokesman
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  1. aria-valuenow doesn't seem to update properly in my environment

Mine too 😱. I thought I had that working right at some point. I’ll get back on it.

2. I'm thinking about avoiding the use of ref.current as much as possible and making use of React state and ResizableBox props.

It might simplify some things and could be worth trying to get a clearer picture of the tradeoffs. I was thinking to avoid dragging operations from re-rendering MetaBoxesMain as they’re high frequency and the performance can stutter already depending on what meta boxes are present (Yoast’s for instance). Although, maybe re-rendering MetaBoxesMain wouldn’t really worsen it.

@stokesman
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Okay, aria-valuenow calculation should work as intended while dragging. Yet I’d meant to question whether it’s important to update during the drag anyway. Maybe it would suffice to only update it when the drag ends. If so, that would permit a little simplification.

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Flaky tests detected in 9fd8e14.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/10866254493
📝 Reported issues:

@t-hamano t-hamano self-requested a review September 16, 2024 12:00
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Thanks for the update! I left a small suggestion at the end, but everything seems to work as expected.

  • ✅ The aria-valuenow attribute shows the correct percentage value
  • ✅ Screen readers announce drag handle operations properly.
  • ✅ The resizable box's max height and aria-valuenow attribute value ​​are updated immediately when the browser height changes or notification components are added
  • ✅ Tested on iPhone. The resize handle is operable by touch.

whether it’s important to update during the drag anyway. Maybe it would suffice to only update it when the drag ends.

I don't have a strong opinion on this, but it seems that the site editor's resizable canvas updates the aria-valuenow attribute while dragging, so it might be fine the way it is now.

@stokesman
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stokesman commented Sep 16, 2024

I’ve added 9559a2d that increases the resize handle height by one pixel. This is to avoid the separator button from having decimal top/bottom margins which can create minute off-centering. The old height was just taken from from what the resize handles used on blocks in the canvas are but they aren’t visibly that size anyway. Nobody’s complained about the rather chunky resize handle so far so probably one more pixel won’t push it over the edge.

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LGTM 👍

@stokesman
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The main thing I don’t like about this is that the tab order doesn’t seem right. From the canvas, one has to tab through the entire meta box area before reaching the resize handle.

meta-box-resize-tab-order.mp4

It’s a limitation of re-resizable (the library our ResizableBox uses). I’ve thought about options to fix this and tinkered on a couple. None that I can see are trivial, but one I worked on has some advantages and I’ll make a PR for it.

Anyway, I don’t think the tab order should block this because it’s considerable effort to fix and this at least adds the missing keyboard support.

@stokesman stokesman merged commit 07c6a1f into trunk Sep 18, 2024
62 checks passed
@stokesman stokesman deleted the update/meta-box-keyboard-resize branch September 18, 2024 04:27
@github-actions github-actions bot added this to the Gutenberg 19.3 milestone Sep 18, 2024
@t-hamano
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The main thing I don’t like about this is that the tab order doesn’t seem right. From the canvas, one has to tab through the entire meta box area before reaching the resize handle.

Yes, I was also concerned about this issue, and when I worked on #57475, I was not able to ideally solve the problem. It would be great if we could solve this issue without updating the library itself 👍

@stokesman
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It would be great if we could solve this issue without updating the library itself

Yes, getting a patch merged upstream would be the proper solution. Switching to another library (or rewriting without one) is an alternative but it’d be complicated by preserving ResizableBox’s current API.

It happens that this use case is relatively simple so just not using ResizableBox was what I did in #65466.

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2 participants