From f134df04b024dcf8310a02558e58afdf2a6ed94c Mon Sep 17 00:00:00 2001
From: Harrison Healey <harrisonmhealey@gmail.com>
Date: Mon, 14 Mar 2016 14:36:40 -0400
Subject: Switched Textbox to use a TextareaAutosize and removed custom
 resizing code

---
 webapp/components/edit_post_modal.jsx           | 24 ++++----
 webapp/components/suggestion/suggestion_box.jsx | 17 +++++-
 webapp/components/textbox.jsx                   | 74 +++++++++----------------
 webapp/package.json                             |  1 +
 webapp/sass/components/_suggestion-list.scss    |  1 +
 webapp/sass/layout/_post.scss                   |  2 -
 6 files changed, 53 insertions(+), 66 deletions(-)

diff --git a/webapp/components/edit_post_modal.jsx b/webapp/components/edit_post_modal.jsx
index 0a55b2968..caf9a0ee5 100644
--- a/webapp/components/edit_post_modal.jsx
+++ b/webapp/components/edit_post_modal.jsx
@@ -27,8 +27,8 @@ const holders = defineMessages({
 import React from 'react';
 
 class EditPostModal extends React.Component {
-    constructor() {
-        super();
+    constructor(props) {
+        super(props);
 
         this.handleEdit = this.handleEdit.bind(this);
         this.handleEditInput = this.handleEditInput.bind(this);
@@ -56,12 +56,13 @@ class EditPostModal extends React.Component {
         updatedPost.id = this.state.post_id;
         updatedPost.channel_id = this.state.channel_id;
 
-        Client.updatePost(updatedPost,
-            function success() {
+        Client.updatePost(
+            updatedPost,
+            () => {
                 AsyncClient.getPosts(updatedPost.channel_id);
                 window.scrollTo(0, 0);
             },
-            function error(err) {
+            (err) => {
                 AsyncClient.dispatchError(err, 'updatePost');
             }
         );
@@ -106,11 +107,11 @@ class EditPostModal extends React.Component {
     componentDidMount() {
         var self = this;
 
-        $(ReactDOM.findDOMNode(this.refs.modal)).on('hidden.bs.modal', function onHidden() {
+        $(ReactDOM.findDOMNode(this.refs.modal)).on('hidden.bs.modal', () => {
             self.setState({editText: '', title: '', channel_id: '', post_id: '', comments: 0, refocusId: '', error: ''});
         });
 
-        $(ReactDOM.findDOMNode(this.refs.modal)).on('show.bs.modal', function onShow(e) {
+        $(ReactDOM.findDOMNode(this.refs.modal)).on('show.bs.modal', (e) => {
             var button = e.relatedTarget;
             if (!button) {
                 return;
@@ -118,12 +119,11 @@ class EditPostModal extends React.Component {
             self.setState({editText: $(button).attr('data-message'), title: $(button).attr('data-title'), channel_id: $(button).attr('data-channelid'), post_id: $(button).attr('data-postid'), comments: $(button).attr('data-comments'), refocusId: $(button).attr('data-refocusid')});
         });
 
-        $(ReactDOM.findDOMNode(this.refs.modal)).on('shown.bs.modal', function onShown() {
-            self.refs.editbox.resize();
-            $('#edit_textbox').get(0).focus();
+        $(ReactDOM.findDOMNode(this.refs.modal)).on('shown.bs.modal', () => {
+            self.refs.editbox.focus();
         });
 
-        $(ReactDOM.findDOMNode(this.refs.modal)).on('hide.bs.modal', function onShown() {
+        $(ReactDOM.findDOMNode(this.refs.modal)).on('hide.bs.modal', () => {
             if (self.state.refocusId !== '') {
                 setTimeout(() => {
                     $(self.state.refocusId).get(0).focus();
@@ -221,4 +221,4 @@ EditPostModal.propTypes = {
     intl: intlShape.isRequired
 };
 
-export default injectIntl(EditPostModal);
\ No newline at end of file
+export default injectIntl(EditPostModal);
diff --git a/webapp/components/suggestion/suggestion_box.jsx b/webapp/components/suggestion/suggestion_box.jsx
index e3ec63194..b7f0e3a36 100644
--- a/webapp/components/suggestion/suggestion_box.jsx
+++ b/webapp/components/suggestion/suggestion_box.jsx
@@ -3,11 +3,14 @@
 
 import $ from 'jquery';
 import ReactDOM from 'react-dom';
+
 import Constants from 'utils/constants.jsx';
 import * as GlobalActions from 'action_creators/global_actions.jsx';
 import SuggestionStore from 'stores/suggestion_store.jsx';
 import * as Utils from 'utils/utils.jsx';
 
+import TextareaAutosize from 'react-textarea-autosize';
+
 const KeyCodes = Constants.KeyCodes;
 
 import React from 'react';
@@ -44,7 +47,13 @@ export default class SuggestionBox extends React.Component {
 
     getTextbox() {
         // this is to support old code that looks at the input/textarea DOM nodes
-        return ReactDOM.findDOMNode(this.refs.textbox);
+        let textbox = this.refs.textbox;
+
+        if (!(textbox instanceof HTMLElement)) {
+            textbox = ReactDOM.findDOMNode(textbox);
+        }
+
+        return textbox;
     }
 
     handleDocumentClick(e) {
@@ -132,7 +141,8 @@ export default class SuggestionBox extends React.Component {
             );
         } else if (this.props.type === 'textarea') {
             textbox = (
-                <textarea
+                <TextareaAutosize
+                    id={this.suggestionId}
                     ref='textbox'
                     {...newProps}
                 />
@@ -163,5 +173,6 @@ SuggestionBox.propTypes = {
 
     // explicitly name any input event handlers we override and need to manually call
     onChange: React.PropTypes.func,
-    onKeyDown: React.PropTypes.func
+    onKeyDown: React.PropTypes.func,
+    onHeightChange: React.PropTypes.func
 };
diff --git a/webapp/components/textbox.jsx b/webapp/components/textbox.jsx
index 1a395072e..371c581e5 100644
--- a/webapp/components/textbox.jsx
+++ b/webapp/components/textbox.jsx
@@ -2,7 +2,6 @@
 // See License.txt for license information.
 
 import $ from 'jquery';
-import ReactDOM from 'react-dom';
 import AtMentionProvider from './suggestion/at_mention_provider.jsx';
 import CommandProvider from './suggestion/command_provider.jsx';
 import EmoticonProvider from './suggestion/emoticon_provider.jsx';
@@ -29,7 +28,7 @@ export default class Textbox extends React.Component {
         this.onRecievedError = this.onRecievedError.bind(this);
         this.handleKeyPress = this.handleKeyPress.bind(this);
         this.handleKeyDown = this.handleKeyDown.bind(this);
-        this.resize = this.resize.bind(this);
+        this.handleHeightChange = this.handleHeightChange.bind(this);
         this.showPreview = this.showPreview.bind(this);
 
         this.state = {
@@ -54,8 +53,6 @@ export default class Textbox extends React.Component {
 
     componentDidMount() {
         ErrorStore.addChangeListener(this.onRecievedError);
-
-        this.resize();
     }
 
     componentWillUnmount() {
@@ -72,10 +69,6 @@ export default class Textbox extends React.Component {
         }
     }
 
-    componentDidUpdate() {
-        this.resize();
-    }
-
     handleKeyPress(e) {
         this.props.onKeyPress(e);
     }
@@ -86,50 +79,28 @@ export default class Textbox extends React.Component {
         }
     }
 
-    focus() {
-        this.refs.message.getTextbox().focus();
-    }
+    handleHeightChange(height) {
+        const textbox = $(this.refs.message.getTextbox());
+        const wrapper = $(this.refs.wrapper);
 
-    resize() {
-        const textbox = this.refs.message.getTextbox();
-        const $textbox = $(textbox);
-        const $wrapper = $(ReactDOM.findDOMNode(this.refs.wrapper));
+        const maxHeight = parseInt(textbox.css('max-height'), 10);
 
-        const padding = parseInt($textbox.css('padding-bottom'), 10) + parseInt($textbox.css('padding-top'), 10);
-        const borders = parseInt($textbox.css('border-bottom-width'), 10) + parseInt($textbox.css('border-top-width'), 10);
-        const maxHeight = parseInt($textbox.css('max-height'), 10) - borders;
-
-        // set the height to auto and remove the scrollbar so we can get the actual size of the contents
-        $textbox.css('height', 'auto').css('overflow-y', 'hidden');
-
-        let height = textbox.scrollHeight - padding;
-
-        if (height + padding > maxHeight) {
-            height = maxHeight - padding;
-
-            // turn scrollbar on and move over attachment icon to compensate for that
-            $textbox.css('overflow-y', 'scroll');
-            $wrapper.closest('.post-body__cell').addClass('scroll');
+        // move over attachment icon to compensate for the scrollbar
+        if (height > maxHeight) {
+            wrapper.closest('.post-body__cell').addClass('scroll');
         } else {
-            $wrapper.closest('.post-body__cell').removeClass('scroll');
+            wrapper.closest('.post-body__cell').removeClass('scroll');
         }
+    }
 
-        // set the textarea to be the proper height
-        $textbox.height(height);
-
-        // set the wrapper height to match the height of the textbox including padding and borders
-        $wrapper.height(height + padding + borders);
-
-        if (this.state.preview) {
-            $(ReactDOM.findDOMNode(this.refs.preview)).height(height + borders);
-        }
+    focus() {
+        this.refs.message.getTextbox().focus();
     }
 
     showPreview(e) {
         e.preventDefault();
         e.target.blur();
         this.setState({preview: !this.state.preview});
-        this.resize();
     }
 
     render() {
@@ -157,7 +128,7 @@ export default class Textbox extends React.Component {
             );
         }
 
-        let helpText = (
+        const helpText = (
             <div
                 style={{visibility: hasText ? 'visible' : 'hidden', opacity: hasText ? '0.5' : '0'}}
                 className='help_format_text'
@@ -174,12 +145,16 @@ export default class Textbox extends React.Component {
                         defaultMessage='_italic_'
                     />
                 </i>
-                <span>~~<strike>
-                    <FormattedMessage
-                        id='textbox.strike'
-                        defaultMessage='strike'
-                    />
-                </strike>~~ </span>
+                <span>
+                    {'~~'}
+                    <strike>
+                        <FormattedMessage
+                            id='textbox.strike'
+                            defaultMessage='strike'
+                        />
+                    </strike>
+                    {'~~ '}
+                </span>
                 <code>
                     <FormattedMessage
                         id='textbox.inlinecode'
@@ -214,16 +189,17 @@ export default class Textbox extends React.Component {
                     spellCheck='true'
                     autoComplete='off'
                     autoCorrect='off'
-                    rows='1'
                     maxLength={Constants.MAX_POST_LEN}
                     placeholder={this.props.createMessage}
                     value={this.props.messageText}
                     onUserInput={this.props.onUserInput}
                     onKeyPress={this.handleKeyPress}
                     onKeyDown={this.handleKeyDown}
+                    onHeightChange={this.handleHeightChange}
                     style={{visibility: this.state.preview ? 'hidden' : 'visible'}}
                     listComponent={SuggestionList}
                     providers={this.suggestionProviders}
+                    channelId={this.props.channelId}
                 />
                 <div
                     ref='preview'
diff --git a/webapp/package.json b/webapp/package.json
index 0c3e9313e..464083bd4 100644
--- a/webapp/package.json
+++ b/webapp/package.json
@@ -23,6 +23,7 @@
     "react-dom": "0.14.7",
     "react-intl": "2.0.0-rc-1",
     "react-router": "2.0.1",
+    "react-textarea-autosize": "3.3.0",
     "twemoji": "1.4.1",
     "velocity-animate": "1.2.3"
   },
diff --git a/webapp/sass/components/_suggestion-list.scss b/webapp/sass/components/_suggestion-list.scss
index 0100026ca..39269642d 100644
--- a/webapp/sass/components/_suggestion-list.scss
+++ b/webapp/sass/components/_suggestion-list.scss
@@ -8,6 +8,7 @@
 
 .suggestion-list--top {
     position: absolute;
+    bottom: 100%;
 }
 
 .suggestion-list__content {
diff --git a/webapp/sass/layout/_post.scss b/webapp/sass/layout/_post.scss
index 9d5be239a..4170483db 100644
--- a/webapp/sass/layout/_post.scss
+++ b/webapp/sass/layout/_post.scss
@@ -7,9 +7,7 @@
     line-height: 20px;
     min-height: 36px;
     overflow-x: hidden;
-    position: absolute;
     resize: none;
-    top: 0px;
     white-space: pre-wrap;
     word-wrap: break-word;
 
-- 
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