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BlockControls, InspectorControls: remove useSlot, unify behavior on bad group #50198

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merged 1 commit into from
May 2, 2023

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@jsnajdr jsnajdr commented Apr 29, 2023

First, removes call of useSlot from InspectorControlsSlot. It performs no function, and should have been removed in #44642, after the introduction of the useSlotFill hook. There was a check if the return value of useSlot is falsy, but it is always truthy, even if the requested slot is not found. Because it returns a combination of the slot data and the update/unregister API.

Second, I'm unifying code that handles the situation where the passed group prop is invalid: the group is not known and has no slot associated. We don't want to crash, therefore careful use of ?.. And we want to report a warning to console. I'm also updating the names of affected components to BlockControls and InspectorControls, using plural, because that's what the name of all the components is.

@jsnajdr jsnajdr added [Type] Code Quality Issues or PRs that relate to code quality [Package] Block editor /packages/block-editor labels Apr 29, 2023
@jsnajdr jsnajdr self-assigned this Apr 29, 2023
@jsnajdr jsnajdr requested a review from ellatrix as a code owner April 29, 2023 06:23
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Size Change: +13 B (0%)

Total Size: 1.37 MB

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@youknowriad youknowriad left a comment

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These changes make sense to me

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@tyxla tyxla left a comment

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Nice cleanup 👍 Thanks!

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@Mamaduka Mamaduka left a comment

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Thank you, @jsnajdr!

P.S. Rebasing should resolve the failing E2E test.

@jsnajdr jsnajdr force-pushed the update/block-inspector-controls-bad-group branch from ffa7e68 to ae00c17 Compare May 2, 2023 07:32
@jsnajdr jsnajdr merged commit 016651b into trunk May 2, 2023
@jsnajdr jsnajdr deleted the update/block-inspector-controls-bad-group branch May 2, 2023 08:12
@github-actions github-actions bot added this to the Gutenberg 15.8 milestone May 2, 2023
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ciampo commented May 5, 2023

Thank you @jsnajdr for cleaning up SlotFill. I also like the suggestions for further cleanup that you made above.

Keeping two versions of a component around without a clear distinction is not great, IMO. It would be interesting to understand if we could keep only one, or at least merge the two implementations into one component (and switch behaviour via a prop or something similar).

SlotFill is also one of the remaining components that hasn't been refactored to TypeScript — do you think it's in a good spot at the moment to allow for such a refactor?

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jsnajdr commented May 10, 2023

It would be interesting to understand if we could keep only one, or at least merge the two implementations into one component (and switch behaviour via a prop or something similar).

This is exactly how SlotFill looked like before @diegohaz refactored it back in #19242: two implementations in one component, switched by a prop. Diego split both implementations into two completely independent modules, merged together only at the top with thin Fill and Slot wrappers.

The original goal was to keep only bubblesVirtually and migrate away from the old implementation. That is still not finished.

Both implementations have their pros and cons, and the crucial difference seems to be in which React context tree does the Fill content live: in the React tree of the Slot, or of the Fill? Old implementation gets context from the Slot, new one from the Fill. It seems that in Gutenberg we mostly want context from the Fill: then a toolbar or sidebar item rendered by a block Edit function sees the block's context, although it's rendered outside the block tree -- it's even in a different iframe.

If we want to keep only one implementation, then, because of the context, it should be bubblesVirtually.

SlotFill is also one of the remaining components that hasn't been refactored to TypeScript

I believe types should be mostly the same for both implementations. If I haven't missed anything, a Slot/Fill can render component of any type, there are no limitations. The only thing that needs to be compatible are fillProps and the functions that work with them.

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ciampo commented May 16, 2023

Thank you for the context, @jsnajdr!

In your opinion, does it make sense to assume that all instances of SlotFill should use the Fill context? Do we ever foresee the need to use the Slot context instead?

I'd love to make progress on the cleaning up and consolidating further SlotFill, as you proposed earlier.

  • If we are not confident that we should always use the Fill context, should we get back to having one component with one prop to switch between Slot content and Fill content?
  • Otherwise, if we are confident, we could migrate all existing usages to the new version of SlotFill, and deprecate the old version

What do you think?

@youknowriad
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At some point, I tried migrating all the usages to "bubblesVirtually" but I didn't manage to merge the PR, it was too big and I end up switching to different work. I still think there's value in trying to do that. I'm not 100% confident that we will be able to achieve it easily but the only way to find out whether it works for all of our instances is to actually try it I think.

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ciampo commented May 16, 2023

I tried migrating all the usages to "bubblesVirtually" but I didn't manage to merge the PR,

We can maybe try again, but with smaller PRs (one component at a time) which hopefully makes it much more manageable ?

@jsnajdr
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jsnajdr commented May 16, 2023

does it make sense to assume that all instances of SlotFill should use the Fill context? Do we ever foresee the need to use the Slot context instead?

I don't think there is any general principle that says that the Fill context is better. In principle both contexts are equally good. It's only that in Gutenberg, given the actual contexts that it uses, it's more convenient to be inside the Fill context.

In a Gutenberg block, when it renders a toolbar item or sidebar item, these UI's live completely outside the "blocks view" or how it's called. They are rendered using a Fill. Such a toolbar item wants to use several contexts:

  • contexts of the block tree when the block lives in: current block context, parent block list context, the context of the post/template the block is in.
  • contexts of the toolbar/sidebar where the UI item is: accessibleToolbarState which allows the item to talk to the parent toolbar. StyleProvider for the Emotion styles of the toolbar or sidebar.

You see, ideally the Fill would like to use both Slot and Fill contexts. But it can use only one, and the other needs to be replaced with other ways how to pass information to the Fill. And it turns out it's easier to live without the Slot contexts. These can be replaced with passing accessibleToolbarState in fillProps, or by wrapping every Fill with SlotProvider directly in the SlotFill library.

@ciampo
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ciampo commented May 16, 2023

Thank you again for the extra context (no pun intended) !

Given the above, what next steps do you propose in order to get towards a simplification of SlotFill ?

@jsnajdr
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jsnajdr commented May 16, 2023

Migrate everything to bubblesVirtually and then remove the older implementation.

Originally I thought that the implementation without portals, the one whose Fill stores pieces of JSX markup and Slot reads and renders them, is better. Because it's conceptually much simpler, it's just passing strings and inert objects around. But then I realized that the really crucial feature is where you get the context from. And that's where bubblesVirtually wins. The downside is that it relies on undocumented behavior of portals, where you can render multiple portals into one container element and somehow they live together in peace. I'd like to understand that better.

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