3/n Splitting PR #1828: updates to the Rich Text Editor example (#1828)

Summary:
Splitting up this PR and updating it as I do.

This piece was an update to the Rich Text Editor example.

This is directly taken from mitermayer 's fork, props to him
Pull Request resolved: #1828

Reviewed By: mitermayer

Differential Revision: D9181983

Pulled By: mitermayer

fbshipit-source-id: aa2b66cb87123f96c3cd9cde19eb0fa86ff47c51

Author: mitermayer

examples/draft-0-10-0/playground/src/DraftJsRichEditorExample.js

@@ -9,8 +9,15 @@ import React, {Component} from 'react';
 
 import {Editor, RichUtils, getDefaultKeyBinding} from 'draft-js';
 
+import gkx from 'draft-js/lib/gkx';
+import NestedRichTextEditorUtil from 'draft-js/lib/NestedRichTextEditorUtil';
+
 import './DraftJsRichEditorExample.css';
 
+const RichTextUtils = gkx('draft_tree_data_support')
+  ? NestedRichTextEditorUtil
+  : RichUtils;
+
 class DraftJsRichEditorExample extends Component {
   constructor(props) {
     super(props);
@@ -23,7 +30,7 @@ class DraftJsRichEditorExample extends Component {
   }
 
   _handleKeyCommand(command, editorState) {
-    const newState = RichUtils.handleKeyCommand(editorState, command);
+    const newState = RichTextUtils.handleKeyCommand(editorState, command);
     if (newState) {
       this.onChange(newState);
       return true;
@@ -33,7 +40,7 @@ class DraftJsRichEditorExample extends Component {
 
   _mapKeyToEditorCommand(e) {
     if (e.keyCode === 9 /* TAB */) {
-      const newEditorState = RichUtils.onTab(
+      const newEditorState = RichTextUtils.onTab(
         e,
         this.props.editorState,
         4 /* maxDepth */,
@@ -47,12 +54,14 @@ class DraftJsRichEditorExample extends Component {
   }
 
   _toggleBlockType(blockType) {
-    this.onChange(RichUtils.toggleBlockType(this.props.editorState, blockType));
+    this.onChange(
+      RichTextUtils.toggleBlockType(this.props.editorState, blockType),
+    );
   }
 
   _toggleInlineStyle(inlineStyle) {
     this.onChange(
-      RichUtils.toggleInlineStyle(this.props.editorState, inlineStyle),
+      RichTextUtils.toggleInlineStyle(this.props.editorState, inlineStyle),
     );
   }