From 9b9376bd041559766fe86786c749a0d033c837b1 Mon Sep 17 00:00:00 2001
From: Kevin Chavez <mr.kev@me.com>
Date: Tue, 28 Jan 2020 03:02:24 -0800
Subject: [PATCH] Re-write `DraftEditorExample` in the website using react
 hooks (#2287)

Summary:
Also took the oportunity to clean up the component- it had unused imports and `_handleKeyCommand` was returning a boolean instead of `"handled"` and `"not-handled"`.

`yarn && yarn start`, used the editor.
Pull Request resolved: https://github.com/facebook/draft-js/pull/2287

Differential Revision: D19598449

Pulled By: claudiopro

fbshipit-source-id: 275ef520c10f941236138211c8eb572c6df28f9d
---
 .../components/DraftEditorExample/index.js    | 217 ++++++++----------
 1 file changed, 101 insertions(+), 116 deletions(-)

diff --git a/website/src/components/DraftEditorExample/index.js b/website/src/components/DraftEditorExample/index.js
index 06c7ea1b01..96ce378da9 100644
--- a/website/src/components/DraftEditorExample/index.js
+++ b/website/src/components/DraftEditorExample/index.js
@@ -6,111 +6,102 @@
  */
 
 import React from 'react';
-import Link from '@docusaurus/Link';
-import useDocusaurusContext from '@docusaurus/useDocusaurusContext';
-import useBaseUrl from '@docusaurus/useBaseUrl';
 import {Editor, EditorState, RichUtils, getDefaultKeyBinding} from 'draft-js';
-import classnames from 'classnames';
-
-import Layout from '@theme/Layout';
 
 import './css/example.css';
 import './css/draft.css';
 import './css/rich-editor.css';
 
-class RichEditorExample extends React.Component {
-  constructor(props) {
-    super(props);
-    this.state = {editorState: EditorState.createEmpty()};
-
-    this.focus = () => this.editor.focus();
-    this.onChange = editorState => this.setState({editorState});
-
-    this.handleKeyCommand = this._handleKeyCommand.bind(this);
-    this.mapKeyToEditorCommand = this._mapKeyToEditorCommand.bind(this);
-    this.toggleBlockType = this._toggleBlockType.bind(this);
-    this.toggleInlineStyle = this._toggleInlineStyle.bind(this);
-  }
-
-  _handleKeyCommand(command, editorState) {
-    const newState = RichUtils.handleKeyCommand(editorState, command);
-    if (newState) {
-      this.onChange(newState);
-      return true;
-    }
-    return false;
-  }
+const {useState, useRef, useCallback} = React;
 
-  _mapKeyToEditorCommand(e) {
-    switch (e.keyCode) {
-      case 9: // TAB
-        const newEditorState = RichUtils.onTab(
-          e,
-          this.state.editorState,
-          4 /* maxDepth */,
-        );
-        if (newEditorState !== this.state.editorState) {
-          this.onChange(newEditorState);
-        }
-        return;
-    }
-    return getDefaultKeyBinding(e);
-  }
+function RichEditorExample(props) {
+  const [editorState, setEditorState] = useState(EditorState.createEmpty());
+  const editor = useRef(null);
 
-  _toggleBlockType(blockType) {
-    this.onChange(RichUtils.toggleBlockType(this.state.editorState, blockType));
-  }
+  const focus = () => {
+    if (editor.current) editor.current.focus();
+  };
 
-  _toggleInlineStyle(inlineStyle) {
-    this.onChange(
-      RichUtils.toggleInlineStyle(this.state.editorState, inlineStyle),
-    );
-  }
+  const handleKeyCommand = useCallback(
+    (command, editorState) => {
+      const newState = RichUtils.handleKeyCommand(editorState, command);
+      if (newState) {
+        setEditorState(newState);
+        return 'handled';
+      }
+      return 'not-handled';
+    },
+    [editorState, setEditorState],
+  );
 
-  render() {
-    const {editorState} = this.state;
-
-    // If the user changes block type before entering any text, we can
-    // either style the placeholder or hide it. Let's just hide it now.
-    let className = 'RichEditor-editor';
-    var contentState = editorState.getCurrentContent();
-    if (!contentState.hasText()) {
-      if (
-        contentState
-          .getBlockMap()
-          .first()
-          .getType() !== 'unstyled'
-      ) {
-        className += ' RichEditor-hidePlaceholder';
+  const mapKeyToEditorCommand = useCallback(
+    e => {
+      switch (e.keyCode) {
+        case 9: // TAB
+          const newEditorState = RichUtils.onTab(
+            e,
+            editorState,
+            4 /* maxDepth */,
+          );
+          if (newEditorState !== editorState) {
+            setEditorState(newEditorState);
+          }
+          return null;
       }
+      return getDefaultKeyBinding(e);
+    },
+    [editorState, setEditorState],
+  );
+
+  // If the user changes block type before entering any text, we can
+  // either style the placeholder or hide it. Let's just hide it now.
+  let className = 'RichEditor-editor';
+  var contentState = editorState.getCurrentContent();
+  if (!contentState.hasText()) {
+    if (
+      contentState
+        .getBlockMap()
+        .first()
+        .getType() !== 'unstyled'
+    ) {
+      className += ' RichEditor-hidePlaceholder';
     }
+  }
 
-    return (
-      <div className="RichEditor-root">
-        <BlockStyleControls
-          editorState={editorState}
-          onToggle={this.toggleBlockType}
-        />
-        <InlineStyleControls
+  return (
+    <div className="RichEditor-root">
+      <BlockStyleControls
+        editorState={editorState}
+        onToggle={blockType => {
+          const newState = RichUtils.toggleBlockType(editorState, blockType);
+          setEditorState(newState);
+        }}
+      />
+      <InlineStyleControls
+        editorState={editorState}
+        onToggle={inlineStyle => {
+          const newState = RichUtils.toggleInlineStyle(
+            editorState,
+            inlineStyle,
+          );
+          setEditorState(newState);
+        }}
+      />
+      <div className={className} onClick={focus}>
+        <Editor
+          blockStyleFn={getBlockStyle}
+          customStyleMap={styleMap}
           editorState={editorState}
-          onToggle={this.toggleInlineStyle}
+          handleKeyCommand={handleKeyCommand}
+          keyBindingFn={mapKeyToEditorCommand}
+          onChange={setEditorState}
+          placeholder="Tell a story..."
+          ref={editor}
+          spellCheck={true}
         />
-        <div className={className} onClick={this.focus}>
-          <Editor
-            blockStyleFn={getBlockStyle}
-            customStyleMap={styleMap}
-            editorState={editorState}
-            handleKeyCommand={this.handleKeyCommand}
-            keyBindingFn={this.mapKeyToEditorCommand}
-            onChange={this.onChange}
-            placeholder="Tell a story..."
-            ref={ref => (this.editor = ref)}
-            spellCheck={true}
-          />
-        </div>
       </div>
-    );
-  }
+    </div>
+  );
 }
 
 // Custom overrides for "code" style.
@@ -132,27 +123,22 @@ function getBlockStyle(block) {
   }
 }
 
-class StyleButton extends React.Component {
-  constructor() {
-    super();
-    this.onToggle = e => {
-      e.preventDefault();
-      this.props.onToggle(this.props.style);
-    };
+function StyleButton({onToggle, active, label, style}) {
+  let className = 'RichEditor-styleButton';
+  if (active) {
+    className += ' RichEditor-activeButton';
   }
 
-  render() {
-    let className = 'RichEditor-styleButton';
-    if (this.props.active) {
-      className += ' RichEditor-activeButton';
-    }
-
-    return (
-      <span className={className} onMouseDown={this.onToggle}>
-        {this.props.label}
-      </span>
-    );
-  }
+  return (
+    <span
+      className={className}
+      onMouseDown={e => {
+        e.preventDefault();
+        onToggle(style);
+      }}>
+      {label}
+    </span>
+  );
 }
 
 const BLOCK_TYPES = [
@@ -168,8 +154,7 @@ const BLOCK_TYPES = [
   {label: 'Code Block', style: 'code-block'},
 ];
 
-const BlockStyleControls = props => {
-  const {editorState} = props;
+function BlockStyleControls({editorState, onToggle}) {
   const selection = editorState.getSelection();
   const blockType = editorState
     .getCurrentContent()
@@ -183,13 +168,13 @@ const BlockStyleControls = props => {
           key={type.label}
           active={type.style === blockType}
           label={type.label}
-          onToggle={props.onToggle}
+          onToggle={onToggle}
           style={type.style}
         />
       ))}
     </div>
   );
-};
+}
 
 const INLINE_STYLES = [
   {label: 'Bold', style: 'BOLD'},
@@ -198,8 +183,8 @@ const INLINE_STYLES = [
   {label: 'Monospace', style: 'CODE'},
 ];
 
-const InlineStyleControls = props => {
-  const currentStyle = props.editorState.getCurrentInlineStyle();
+function InlineStyleControls({editorState, onToggle}) {
+  const currentStyle = editorState.getCurrentInlineStyle();
   return (
     <div className="RichEditor-controls">
       {INLINE_STYLES.map(type => (
@@ -207,12 +192,12 @@ const InlineStyleControls = props => {
           key={type.label}
           active={currentStyle.has(type.style)}
           label={type.label}
-          onToggle={props.onToggle}
+          onToggle={onToggle}
           style={type.style}
         />
       ))}
     </div>
   );
-};
+}
 
 export default RichEditorExample;