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Drag & Drop: Fix unexpected row/gallery creation logic #64241

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merged 4 commits into from
Aug 6, 2024

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@t-hamano t-hamano commented Aug 5, 2024

Fixes #64227

What?

This PR prevents the unintended appearance of the dropzone (vertical inserter) for creating rows or galleries in certain scenarios.

Why?

We need to consider the following scenarios:

  • Group block is not registered
  • Row variation is not registered
  • Gallery block is not registered
  • Cannot be wrapped in a Row block

For example, if the Gallery block, Group block, and Row variation are not all registered, the dropzone itself should not be displayed.

How?

Check in advance whether the Row block or the Gallery block can be created. If there are no creatable blocks, the dropzone itself will not be displayed.

Testing Instructions

Test the following scenarios:

Default

  • Insert a Buttons block and orient it vertically.
  • Drag the button to the side of the other button.
    • ❌ trunk: The dropzone appears. Blocks get duplicated or the browser freezes.
    • ✅ This PR: The dropzone should not be displayed.

Row variation is not registered

wp.blocks.unregisterBlockVariation( 'core/group', 'group-row' );
  • Insert two Paragraph blocks.
  • Drag the second Paragraph block to the side of the first Paragraph block.
    • ❌ trunk: The dropzone is displayed and the Row block with layout.type as flex appears to be created correctly, but the block name remains Group.
    • ✅ This PR: The dropzone should not be displayed.

Group block is not registered

wp.blocks.unregisterBlockType( 'core/group');
  • Insert two Paragraph blocks.
  • Drag the second Paragraph block to the side of the first Paragraph block.
    • ❌ trunk: The dropzone appears. Blocks get duplicated or the browser freezes.
    • ✅ This PR: The dropzone should not be displayed.

Gallery block and Row variation are not registered

wp.blocks.unregisterBlockType( 'core/gallery');
wp.blocks.unregisterBlockVariation( 'core/group', 'group-row' );
  • Insert two Image blocks.
  • Drag the second Image block to the side of the first Image block.
    • ❌ trunk: The dropzone is displayed and the Row block with layout.type as flex appears to be created correctly, but the block name remains Group.
    • ✅ This PR: The dropzone should not be displayed.

Gallery block, Group block, and Row variations are not registered

wp.blocks.unregisterBlockType( 'core/gallery');
wp.blocks.unregisterBlockType( 'core/group');
wp.blocks.unregisterBlockVariation( 'core/group', 'group-row' );
  • Insert two Image blocks.
  • Drag the second Image block to the side of the first Image block.
    • ❌ trunk: The inserter appears. Blocks get duplicated or the browser freezes.
    • ✅ This PR: The dropzone should not be displayed.

@t-hamano t-hamano added [Type] Bug An existing feature does not function as intended [Feature] Drag and Drop Drag and drop functionality when working with blocks [Feature] Layout Layout block support, its UI controls, and style output. labels Aug 5, 2024
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github-actions bot commented Aug 5, 2024

Size Change: +81 B (0%)

Total Size: 1.77 MB

Filename Size Change
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github-actions bot commented Aug 5, 2024

Flaky tests detected in 7856402.
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/10241148533
📝 Reported issues:

if ( operation === 'replace' ) {
replaceBlocks( clientId, blocks, undefined, initialPosition );
} else if ( operation === 'group' && areGroupableBlocks ) {
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At this point, it is guaranteed that at least one of the Row block or Gallery block can be created, so areGroupableBlocks is not necessary.

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Just double-checking, is that because this check is now happening in the throttle'd function instead, prior to displaying the drop indicator and setting the drop target?

It looks like that other code also calls isGroupable, too 👍. From memory the other thing we needed to check was that the hovered over block can be removed, so as long as the check is happening somewhere that sounds good to me!

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Just double-checking, is that because this check is now happening in the "throttle"'d function instead, prior to displaying the drop indicator and setting the drop target?

Yes. If the areGroupableBlocks check is present here, the gallery block will not be created when the following conditions are met:

  • The Group block is unregistered
  • he dragged blocks and the target block are all images

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Thanks for clarifying!

* @param {boolean} canInsertRow
* @return {boolean} Whether Row block or Gallery can be created.
*/
function canCreateRowOrGallery(
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This process might not even need to be made into a function.

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"Either or" I think.

It doesn't abstract much and could be inline and just as neat. Unless it needs unit testing.

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Same. Since it's only used in one place, I'd lean slightly toward inlining unless it needs unit testing.

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I removed the function and inlined it here 👍

@t-hamano t-hamano marked this pull request as ready for review August 5, 2024 03:32
@t-hamano t-hamano requested a review from ellatrix as a code owner August 5, 2024 03:32
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Co-authored-by: t-hamano <wildworks@git.wordpress.org>
Co-authored-by: ramonjd <ramonopoly@git.wordpress.org>
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@t-hamano t-hamano self-assigned this Aug 5, 2024
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I did a smoke test on trunk and this PR and things are working as you describe. Thanks for the PR!

In trunk, adding a button block to a vertical row of button completely smashed by browser 😅

I'm not an expert in this area, so it might be good to see if @andrewserong or @kevin940726 have time to run their eyes over it.

* @param {boolean} canInsertRow
* @return {boolean} Whether Row block or Gallery can be created.
*/
function canCreateRowOrGallery(
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"Either or" I think.

It doesn't abstract much and could be inline and just as neat. Unless it needs unit testing.

}
dropTargetPosition;

// Checks if it is creatable either a Row variation or a Gallery block from
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Just checking, so this condition checks if a Row (Group) block or a Gallery block can be created after drop?

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No, it checks if it can be created before the drop. This prevents unintended inserters from appearing.

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Nice work @t-hamano, this is testing great for me and I could reproduce each of the issues in trunk and those cases behaved as expected with this PR applied 👍

✅ Dragging a Button to the side of the vertical Buttons block no longer shows the dropzone
✅ The dropzone is not displayed when dragging a paragraph and the Row variation is not registered
✅ The dropzone is not displayed when dragging a paragraph and the Group block is not registered
✅ The dropzone is not displayed when dragging an image onto another image and the Gallery block and Row variations are not registered
✅ The dropzone is not displayed when dragging an image onto another image and the Gallery block, Group block and Row variations are not registered

Smoke tested dragging and dropping in the post and site editors, and otherwise all appears to be working well for me.

LGTM! 🚀

@t-hamano t-hamano merged commit f12b78b into trunk Aug 6, 2024
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@t-hamano t-hamano deleted the try/fix-into-row-gallery branch August 6, 2024 08:22
@github-actions github-actions bot added this to the Gutenberg 19.0 milestone Aug 6, 2024
@talldan talldan changed the title Drag & Drop: Fix unexpected row/galley creation logic Drag & Drop: Fix unexpected row/gallery creation logic Aug 6, 2024
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Labels
[Feature] Drag and Drop Drag and drop functionality when working with blocks [Feature] Layout Layout block support, its UI controls, and style output. [Type] Bug An existing feature does not function as intended
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In-between inserter: Unexpected vertical inserter display
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