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Table of Contents: Use a custom store subscription for observing headings #54094
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,156 @@ | ||
| /** | ||
| * External dependencies | ||
| */ | ||
| import fastDeepEqual from 'fast-deep-equal/es6'; | ||
|
|
||
| /** | ||
| * WordPress dependencies | ||
| */ | ||
| import { useRegistry } from '@wordpress/data'; | ||
| import { __unstableStripHTML as stripHTML } from '@wordpress/dom'; | ||
| import { useEffect } from '@wordpress/element'; | ||
| import { addQueryArgs, removeQueryArgs } from '@wordpress/url'; | ||
| import { store as blockEditorStore } from '@wordpress/block-editor'; | ||
|
|
||
| function getLatestHeadings( select, clientId ) { | ||
| const { | ||
| getBlockAttributes, | ||
| getBlockName, | ||
| getClientIdsWithDescendants, | ||
| __experimentalGetGlobalBlocksByName: getGlobalBlocksByName, | ||
| } = select( blockEditorStore ); | ||
|
|
||
| // FIXME: @wordpress/block-library should not depend on @wordpress/editor. | ||
| // Blocks can be loaded into a *non-post* block editor, so to avoid | ||
| // declaring @wordpress/editor as a dependency, we must access its | ||
| // store by string. When the store is not available, editorSelectors | ||
| // will be null, and the block's saved markup will lack permalinks. | ||
| // eslint-disable-next-line @wordpress/data-no-store-string-literals | ||
| const permalink = select( 'core/editor' ).getPermalink() ?? null; | ||
|
|
||
| const isPaginated = getGlobalBlocksByName( 'core/nextpage' ).length !== 0; | ||
| const { onlyIncludeCurrentPage } = getBlockAttributes( clientId ) ?? {}; | ||
|
|
||
| // Get the client ids of all blocks in the editor. | ||
| const allBlockClientIds = getClientIdsWithDescendants(); | ||
|
|
||
| // If onlyIncludeCurrentPage is true, calculate the page (of a paginated post) this block is part of, so we know which headings to include; otherwise, skip the calculation. | ||
| let tocPage = 1; | ||
|
|
||
| if ( isPaginated && onlyIncludeCurrentPage ) { | ||
| // We can't use getBlockIndex because it only returns the index | ||
| // relative to sibling blocks. | ||
| const tocIndex = allBlockClientIds.indexOf( clientId ); | ||
|
|
||
| for ( const [ | ||
| blockIndex, | ||
| blockClientId, | ||
| ] of allBlockClientIds.entries() ) { | ||
| // If we've reached blocks after the Table of Contents, we've | ||
| // finished calculating which page the block is on. | ||
| if ( blockIndex >= tocIndex ) { | ||
| break; | ||
| } | ||
| if ( getBlockName( blockClientId ) === 'core/nextpage' ) { | ||
| tocPage++; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| const latestHeadings = []; | ||
|
|
||
| /** The page (of a paginated post) a heading will be part of. */ | ||
| let headingPage = 1; | ||
| let headingPageLink = null; | ||
|
|
||
| // If the core/editor store is available, we can add permalinks to the | ||
| // generated table of contents. | ||
| if ( typeof permalink === 'string' ) { | ||
| headingPageLink = isPaginated | ||
| ? addQueryArgs( permalink, { page: headingPage } ) | ||
| : permalink; | ||
| } | ||
|
|
||
| for ( const blockClientId of allBlockClientIds ) { | ||
| const blockName = getBlockName( blockClientId ); | ||
| if ( blockName === 'core/nextpage' ) { | ||
| headingPage++; | ||
|
|
||
| // If we're only including headings from the current page (of | ||
| // a paginated post), then exit the loop if we've reached the | ||
| // pages after the one with the Table of Contents block. | ||
| if ( onlyIncludeCurrentPage && headingPage > tocPage ) { | ||
| break; | ||
| } | ||
|
|
||
| if ( typeof permalink === 'string' ) { | ||
| headingPageLink = addQueryArgs( | ||
| removeQueryArgs( permalink, [ 'page' ] ), | ||
| { page: headingPage } | ||
| ); | ||
| } | ||
| } | ||
| // If we're including all headings or we've reached headings on | ||
| // the same page as the Table of Contents block, add them to the | ||
| // list. | ||
| else if ( ! onlyIncludeCurrentPage || headingPage === tocPage ) { | ||
| if ( blockName === 'core/heading' ) { | ||
| const headingAttributes = getBlockAttributes( blockClientId ); | ||
|
|
||
| const canBeLinked = | ||
| typeof headingPageLink === 'string' && | ||
| typeof headingAttributes.anchor === 'string' && | ||
| headingAttributes.anchor !== ''; | ||
|
|
||
| latestHeadings.push( { | ||
| // Convert line breaks to spaces, and get rid of HTML tags in the headings. | ||
| content: stripHTML( | ||
| headingAttributes.content.replace( | ||
| /(<br *\/?>)+/g, | ||
| ' ' | ||
| ) | ||
| ), | ||
| level: headingAttributes.level, | ||
| link: canBeLinked | ||
| ? `${ headingPageLink }#${ headingAttributes.anchor }` | ||
| : null, | ||
| } ); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return latestHeadings; | ||
| } | ||
|
|
||
| function observeCallback( select, dispatch, clientId ) { | ||
| const { getBlockAttributes } = select( blockEditorStore ); | ||
| const { updateBlockAttributes, __unstableMarkNextChangeAsNotPersistent } = | ||
| dispatch( blockEditorStore ); | ||
|
|
||
| /** | ||
| * If the block no longer exists in the store, skip the update. | ||
| * The "undo" action recreates the block and provides a new `clientId`. | ||
| * The hook still might be observing the changes while the old block unmounts. | ||
| */ | ||
| const attributes = getBlockAttributes( clientId ); | ||
| if ( attributes === null ) { | ||
| return; | ||
| } | ||
|
|
||
| const headings = getLatestHeadings( select, clientId ); | ||
| if ( ! fastDeepEqual( headings, attributes.headings ) ) { | ||
| __unstableMarkNextChangeAsNotPersistent(); | ||
| updateBlockAttributes( clientId, { headings } ); | ||
| } | ||
| } | ||
|
|
||
| export function useObserveHeadings( clientId ) { | ||
| const registry = useRegistry(); | ||
| useEffect( () => { | ||
| // Todo: Limit subscription to block editor store when data no longer depends on `getPermalink`. | ||
| // See: https://github.com/WordPress/gutenberg/pull/45513 | ||
| return registry.subscribe( () => | ||
| observeCallback( registry.select, registry.dispatch, clientId ) | ||
| ); | ||
| }, [ registry, clientId ] ); | ||
| } | ||
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@ZebulanStanphill, do you remember the reason for using absolute URLs instead of relative ones?
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Relative links don't work in situations where the contents of the post (and therefore the Table of Contents, if the post has one) appear on a page other than the one dedicated to the post itself. The most common example of this: a blog template where the entire contents of multiple posts are laid out (which was the default home page template for several past WordPress themes).