ui: use vditor as default markdown editor

packages/ui-default/components/cmeditor/EditorComponent.jsx

@@ -0,0 +1,38 @@
+import React from 'react';
+import Vditor from 'vditor';
+import { config } from './index';
+
+export default class MarkdownEditor extends React.PureComponent {
+  constructor(props) {
+    super(props);
+    this.ref = React.createRef();
+  }
+
+  async componentDidMount() {
+    await new Promise((resolve) => {
+      this.editor = new Vditor(this.ref.current, {
+        ...config,
+        after: resolve,
+        input(value) { this.props.onChange(value); },
+        cache: { id: Math.random().toString() },
+      });
+    });
+  }
+
+  componentWillUnmount() {
+    this.editor.destory();
+    this.editor.detach();
+  }
+
+  value() {
+    return this.editor.getValue();
+  }
+
+  focus() {
+    return this.editor.focus();
+  }
+
+  render() {
+    return <div ref={this.ref}></div>;
+  }
+}