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BlockTitle: avoid re-render on attributes change #32118

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BlockTitle: avoid re-render on attributes change #32118

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49 changes: 25 additions & 24 deletions packages/block-editor/src/components/block-title/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -35,43 +35,44 @@ import { store as blockEditorStore } from '../../store';
* @return {?string} Block title.
*/
export default function BlockTitle( { clientId } ) {
const { attributes, name, reusableBlockTitle } = useSelect(
const blockInformation = useBlockDisplayInformation( clientId );
const title = useSelect(
( select ) => {
if ( ! clientId ) {
return {};
return null;
}

const {
getBlockName,
getBlockAttributes,
__experimentalGetReusableBlockTitle,
} = select( blockEditorStore );
const blockName = getBlockName( clientId );

if ( ! blockName ) {
return {};
return null;
}

const blockType = getBlockType( blockName );
const isReusable = isReusableBlock( blockType );
const attributes = getBlockAttributes( clientId );
const reusableBlockTitle =
isReusable &&
__experimentalGetReusableBlockTitle( attributes.ref );
const label =
reusableBlockTitle || getBlockLabel( blockType, attributes );

// Label will fallback to the title if no label is defined for the
// current label context. If the label is defined we prioritize it
// over possible possible block variation title match.
if ( label === blockType.title ) {
return null;
}
const isReusable = isReusableBlock( getBlockType( blockName ) );
return {
attributes: getBlockAttributes( clientId ),
name: blockName,
reusableBlockTitle:
isReusable &&
__experimentalGetReusableBlockTitle(
getBlockAttributes( clientId ).ref
),
};

return truncate( label, { length: 35 } );
},
[ clientId ]
);

const blockInformation = useBlockDisplayInformation( clientId );
if ( ! name || ! blockInformation ) return null;
const blockType = getBlockType( name );
const label = reusableBlockTitle || getBlockLabel( blockType, attributes );
// Label will fallback to the title if no label is defined for the current
// label context. If the label is defined we prioritize it over possible
// possible block variation title match.
if ( label !== blockType.title ) {
return truncate( label, { length: 35 } );
}
return blockInformation.title;
return title || blockInformation.title;
}