feat(notebook): support text direction controls (#6293)

packages/widgets/src/notebook/text-direction.ts

@@ -0,0 +1,28 @@
+import { Extension } from "@tiptap/react";
+import type { Editor } from "@tiptap/react";
+
+export type TextDirection = "ltr" | "rtl";
+
+export const NotebookTextDirection = Extension.create({
+  name: "notebookTextDirection",
+
+  addGlobalAttributes() {
+    return [
+      {
+        types: ["heading", "paragraph"],
+        attributes: {
+          dir: {
+            default: null,
+            parseHTML: (element) => element.getAttribute("dir"),
+            renderHTML: ({ dir }: { dir?: TextDirection }) => (dir ? { dir } : {}),
+          },
+        },
+      },
+    ];
+  },
+});
+
+export function setTextDirection(editor: Editor, direction: TextDirection) {
+  const nodeType = editor.isActive("heading") ? "heading" : "paragraph";
+  return editor.chain().focus().updateAttributes(nodeType, { dir: direction });
+}