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Table of Contents: Try maintaining block example attributes #65549

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merged 3 commits into from
Sep 23, 2024

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aaronrobertshaw
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@aaronrobertshaw aaronrobertshaw commented Sep 23, 2024

Part of: #64707
Related: #65430

What?

Adds block example for the Table of Contents.

Why?

The Style Book is being iterated on and part of that effort is to ensure the desired blocks are shown there. Currently, the Table of Contents blocks only shows a placeholder which isn't a great experience when the point of the Style Book is to see how it would actually look.

How?

Defines a block example containing both a headings attribute value and corresponding inner blocks.

The innerBlocks definition means there are heading blocks matching the headings attribute so the useObserveHeadings hook doesn't override the example attributes with an empty set.

Testing Instructions

  1. In the editor, open the main block inserter from the top left
  2. Search for the Table of Contents block and hover over it
  3. Confirm the preview for the block displays the example block headings instead of a placeholder advising to add headings

Screenshots or screencast

Screenshot 2024-09-23 at 10 41 13 am

@aaronrobertshaw aaronrobertshaw added [Type] Enhancement A suggestion for improvement. [Block] Table of contents (experimental) Affects the Table of contents Block labels Sep 23, 2024
@aaronrobertshaw aaronrobertshaw self-assigned this Sep 23, 2024
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Comment on lines 150 to 157
const blockType = useSelect(
( select ) =>
select( blocksStore ).getBlockType( 'core/table-of-contents' ),
[]
);
const isExample =
JSON.stringify( blockType.example.attributes.headings ) ===
JSON.stringify( headings );
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I struggled to find a better option to avoid the useObserveHeadings hook overriding arbitrary block example attributes. More than happy to hear better approaches if you have them 🙏

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Size Change: +74 B (0%)

Total Size: 1.77 MB

Filename Size Change
build/block-library/index.min.js 219 kB +74 B (+0.03%)
ℹ️ View Unchanged
Filename Size
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Might be seeing things, but adding innerBlocks to the example works for me

@@ -19,6 +19,28 @@ export const settings = {
icon,
edit,
save,
example: {
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Could this be moved to block.json?

I think the example check above might be unnecessary if we use innerBlocks (?)

	"example": {
		"innerBlocks": [
			{
				"name": "core/heading",
				"attributes": {
					"level": 2,
					"content": "Heading"
				}
			},
			{
				"name": "core/heading",
				"attributes": {
					"level": 3,
					"content": "Subheading"
				}
			},
			{
				"name": "core/heading",
				"attributes": {
					"level": 2,
					"content": "Heading"
				}
			},
			{
				"name": "core/heading",
				"attributes": {
					"level": 3,
					"content": "Subheading"
				}
			}
		],
		"attributes": {
			"headings": [
				{
					"content": "Heading",
					"level": 2
				},
				{
					"content": "Subheading",
					"level": 3
				},
				{
					"content": "Heading",
					"level": 2
				},
				{
					"content": "Subheading",
					"level": 3
				}
			]
		}
	},
Screenshot 2024-09-23 at 11 45 29 am

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Yep, that works, thanks 🙇

I take it that the definition of the innerBlocks and them being rendered initially for the example means there are heading blocks in the registry. That then leads the useObserveHeadings hook to find those before updating the block's headings attribute.

If I remove the attributes.headings value, you can see the block example start in the placeholder state then update to match the provided inner blocks.

I've pushed a commit using the suggested approach.

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I take it that the definition of the innerBlocks and them being rendered initially for the example means there are heading blocks in the registry. That then leads the useObserveHeadings hook to find those before updating the block's headings attribute.

That sounds legit. My brain stops functioning when I see something working. 😄

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Working a treat for me! :shipit:

Screenshot 2024-09-23 at 12 06 44 pm Screenshot 2024-09-23 at 12 06 30 pm

@aaronrobertshaw aaronrobertshaw merged commit 5b6e6cb into trunk Sep 23, 2024
63 checks passed
@aaronrobertshaw aaronrobertshaw deleted the add/table-of-contents-block-example branch September 23, 2024 02:34
@github-actions github-actions bot added this to the Gutenberg 19.4 milestone Sep 23, 2024
ramonjd added a commit that referenced this pull request Sep 23, 2024
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2 participants