@wordpress/block-library/build-module/paragraph/use-enter.js

Block library for the WordPress editor.

// packages/block-library/src/paragraph/use-enter.js
import { useRef } from "@wordpress/element";
import { useRefEffect } from "@wordpress/compose";
import { ENTER } from "@wordpress/keycodes";
import { useSelect, useDispatch, useRegistry } from "@wordpress/data";
import { store as blockEditorStore } from "@wordpress/block-editor";
import {
  hasBlockSupport,
  createBlock,
  getDefaultBlockName
} from "@wordpress/blocks";
function useOnEnter(props) {
  const { batch } = useRegistry();
  const {
    moveBlocksToPosition,
    replaceInnerBlocks,
    duplicateBlocks,
    insertBlock
  } = useDispatch(blockEditorStore);
  const {
    getBlockRootClientId,
    getBlockIndex,
    getBlockOrder,
    getBlockName,
    getBlock,
    getNextBlockClientId,
    canInsertBlockType
  } = useSelect(blockEditorStore);
  const propsRef = useRef(props);
  propsRef.current = props;
  return useRefEffect((element) => {
    function onKeyDown(event) {
      if (event.defaultPrevented) {
        return;
      }
      if (event.keyCode !== ENTER) {
        return;
      }
      const { content, clientId } = propsRef.current;
      if (content.length) {
        return;
      }
      const wrapperClientId = getBlockRootClientId(clientId);
      if (!hasBlockSupport(
        getBlockName(wrapperClientId),
        "__experimentalOnEnter",
        false
      )) {
        return;
      }
      const order = getBlockOrder(wrapperClientId);
      const position = order.indexOf(clientId);
      if (position === order.length - 1) {
        let newWrapperClientId = wrapperClientId;
        while (!canInsertBlockType(
          getBlockName(clientId),
          getBlockRootClientId(newWrapperClientId)
        )) {
          newWrapperClientId = getBlockRootClientId(newWrapperClientId);
        }
        if (typeof newWrapperClientId === "string") {
          event.preventDefault();
          moveBlocksToPosition(
            [clientId],
            wrapperClientId,
            getBlockRootClientId(newWrapperClientId),
            getBlockIndex(newWrapperClientId) + 1
          );
        }
        return;
      }
      const defaultBlockName = getDefaultBlockName();
      if (!canInsertBlockType(
        defaultBlockName,
        getBlockRootClientId(wrapperClientId)
      )) {
        return;
      }
      event.preventDefault();
      const wrapperBlock = getBlock(wrapperClientId);
      batch(() => {
        duplicateBlocks([wrapperClientId]);
        const blockIndex = getBlockIndex(wrapperClientId);
        replaceInnerBlocks(
          wrapperClientId,
          wrapperBlock.innerBlocks.slice(0, position)
        );
        replaceInnerBlocks(
          getNextBlockClientId(wrapperClientId),
          wrapperBlock.innerBlocks.slice(position + 1)
        );
        insertBlock(
          createBlock(defaultBlockName),
          blockIndex + 1,
          getBlockRootClientId(wrapperClientId),
          true
        );
      });
    }
    element.addEventListener("keydown", onKeyDown);
    return () => {
      element.removeEventListener("keydown", onKeyDown);
    };
  }, []);
}
export {
  useOnEnter
};
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