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Implement the nested block behavior in list block v2 #39487

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merged 3 commits into from
Mar 16, 2022

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youknowriad
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Related #6394

What?

This PR implements the logic for the list block v2 (with inner blocks). It adds the base save/edit for list and list item blocks.

How?

At the moment, the block is very rough, I decided explicitly to only focus on:

  • Making sure the saved markup is the exact markup that we want to achieve (similar to the current list block)
  • Making sure we can add list and list items in the editor (though very rough)

There's a lot of things to be implemented here to make this block more usable, the idea is that now that we have the list block and basic behavior in place, we can potentially work in parallel if needed on some of these points:

  • Making sure the editor markup and the frontend markup match. Right now the editor has two extra wrappers: a "span" around the RichText and a "div" around the inner blocks of a list item. Both of these wrappers make the initial implementation simple but we should see if it's possible to remove them to totally match the frontend.
  • Improve the appenders: Potentially remove some of them or show them in the right position (avoid layout shifts)
  • Keyboard interactions:
    • Enter should create new list items
    • Implement indent/outdent shortcuts
    • Implement double enter to leave the list block
    • Implement merging and splitting list blocks
  • Explore if absorb toolbar make sense
  • Bring back the features of the old list block (choosing the "start", "reverse" and type of list)
  • Decide what customization options (block supports) we want to enable in the "list item" block.

Testing Instructions

1- Enable the "list block v2" experiment
2- Insert a list block
3- You can use appenders and such (regular inner blocks UI) to insert list items and nested lists (interaction is very rough without keyboard support)
4- Make sure the produced markup is correct.

Screen.Recording.2022-03-16.at.9.25.50.AM.mov

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Size Change: +224 B (0%)

Total Size: 1.16 MB

Filename Size Change
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packages/block-library/src/list-item/block.json Outdated Show resolved Hide resolved
export default function save() {
return (
<ul { ...useBlockProps.save() }>
<InnerBlocks.Content />
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Could we add some checks to return null if there are no inner blocks? It is very easy to create an empty list item for the user is very hard to remove. Or maybe we can automatically remove the list block if it becomes empty?

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we should add a shortcut later that removes it on backspace

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For me this is a good base implementation to land and split the rest of the work in parallel. Thanks Riad!

Comment on lines +13 to +15
const innerBlocksProps = useInnerBlocksProps( blockProps, {
allowedBlocks: [ 'core/list' ],
} );
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@ZebulanStanphill ZebulanStanphill Mar 16, 2022

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Nitpick: { allowedBlocks: [ 'core/list' ] } could be moved to a constant outside of the component to avoid recreating it on every render.

@ellatrix ellatrix force-pushed the add/list-nested-blocks branch from e5b0031 to 74e079f Compare March 16, 2022 16:22
@ellatrix ellatrix merged commit 00a7f89 into trunk Mar 16, 2022
@ellatrix ellatrix deleted the add/list-nested-blocks branch March 16, 2022 19:01
@github-actions github-actions bot added this to the Gutenberg 12.9 milestone Mar 16, 2022
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Nothing to add here, just glad to see the experiment taking off!

"content": {
"type": "string",
"source": "html",
"selector": "li",
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Indentation here is off.

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