@churchapps/apphelper-markdown
Version:
ChurchApps markdown/lexical editor components
41 lines (40 loc) • 1.83 kB
JavaScript
import { $getListDepth, $isListItemNode, $isListNode } from "@lexical/list";
import { useLexicalComposerContext } from "@lexical/react/LexicalComposerContext";
import { $getSelection, $isElementNode, $isRangeSelection, INDENT_CONTENT_COMMAND, COMMAND_PRIORITY_HIGH } from "lexical";
import { useEffect } from "react";
function getElementNodesInSelection(selection) {
const nodesInSelection = selection.getNodes();
if (nodesInSelection.length === 0) {
return new Set([
selection.anchor.getNode().getParentOrThrow(),
selection.focus.getNode().getParentOrThrow()
]);
}
return new Set(nodesInSelection.map((n) => ($isElementNode(n) ? n : n.getParentOrThrow())));
}
function isIndentPermitted(maxDepth) {
const selection = $getSelection();
if (!$isRangeSelection(selection)) {
return false;
}
const elementNodesInSelection = getElementNodesInSelection(selection);
let totalDepth = 0;
for (const elementNode of elementNodesInSelection) {
if ($isListNode(elementNode)) {
totalDepth = Math.max($getListDepth(elementNode) + 1, totalDepth);
}
else if ($isListItemNode(elementNode)) {
const parent = elementNode.getParent();
if (!$isListNode(parent)) {
throw new Error("ListMaxIndentLevelPlugin: A ListItemNode must have a ListNode for a parent.");
}
totalDepth = Math.max($getListDepth(parent) + 1, totalDepth);
}
}
return totalDepth <= maxDepth;
}
export default function ListMaxIndentLevelPlugin({ maxDepth = 7 }) {
const [editor] = useLexicalComposerContext();
useEffect(() => (editor.registerCommand(INDENT_CONTENT_COMMAND, () => !isIndentPermitted(maxDepth), COMMAND_PRIORITY_HIGH)), [editor, maxDepth]);
return null;
}