PLT-4404/PLT-4578/PLT-4541/PLT-4542 Replaced third party autosizing textarea with a custom one (#4442)

* PLT-4578 Replaced third party autosizing textarea with a custom one

* Fix Textbox.handleHeightChange not being called

* Removed unused CSS

* PLT-4541 Force EditPostModal to resize upon opening

* Removed usage of jquery from AutosizeTextarea

* Reverted changes made for PLT-4580 as they're no longer needed

8 files changed, 138 insertions, 87 deletions

diff --git a/NOTICE.txt b/NOTICE.txt
index 092ce0cc8..7d0b16ff7 100644
--- a/NOTICE.txt
+++ b/NOTICE.txt
@@ -1284,37 +1284,6 @@ limitations under the License.
 
 ---
 
-This product contains a modified portion of 'react-autosize-textarea', a light replacement for built-in textarea component which automaticaly adjusts its height to match the content.
-
-* HOMEPAGE: 
-  * https://github.com/buildo/react-autosize-textarea
-  
-* LICENSE: 
-
-The MIT License (MIT)
-
-Copyright (c) 2016 buildo s.r.l.s.
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
-
----
-
 This product contains a modified portion of 'compass-mixins', which pulls SASS style sheets on Bower, and enjoys the compass mixins by using libsass for faster compilation, by Christopher M. Eppstein.
 
 * HOMEPAGE: 
diff --git a/webapp/components/autosize_textarea.jsx b/webapp/components/autosize_textarea.jsx
new file mode 100644
index 000000000..45807fda0
--- /dev/null
+++ b/webapp/components/autosize_textarea.jsx
@@ -0,0 +1,90 @@
+// Copyright (c) 2015 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+import React from 'react';
+
+export default class AutosizeTextarea extends React.Component {
+    static propTypes = {
+        value: React.PropTypes.string,
+        placeholder: React.PropTypes.string,
+        onHeightChange: React.PropTypes.func
+    }
+
+    constructor(props) {
+        super(props);
+
+        this.height = 0;
+    }
+
+    get value() {
+        return this.refs.textarea.value;
+    }
+
+    set value(value) {
+        this.refs.textarea.value = value;
+    }
+
+    componentDidUpdate() {
+        this.recalculateSize();
+    }
+
+    recalculateSize() {
+        const height = this.refs.reference.scrollHeight;
+
+        if (height > 0 && height !== this.height) {
+            const textarea = this.refs.textarea;
+
+            const style = getComputedStyle(textarea);
+            const borderWidth = parseInt(style.borderTopWidth, 10) + parseInt(style.borderBottomWidth, 10);
+
+            // Directly change the height to avoid circular rerenders
+            textarea.style.height = String(height + borderWidth) + 'px';
+
+            this.height = height;
+
+            if (this.props.onHeightChange) {
+                this.props.onHeightChange(height, parseInt(style.maxHeight, 10));
+            }
+        }
+    }
+
+    getDOMNode() {
+        return this.refs.textarea;
+    }
+
+    render() {
+        window.forceUpdate = this.forceUpdate.bind(this);
+        const {
+            value,
+            placeholder,
+            ...otherProps
+        } = this.props;
+
+        const heightProps = {};
+        if (this.height <= 0) {
+            // Set an initial number of rows so that the textarea doesn't appear too large when its first rendered
+            heightProps.rows = 1;
+        } else {
+            heightProps.height = this.height;
+        }
+
+        return (
+            <div>
+                <textarea
+                    ref='textarea'
+                    {...heightProps}
+                    {...this.props}
+                />
+                <div style={{height: 0, overflow: 'hidden'}}>
+                    <textarea
+                        ref='reference'
+                        style={{height: 'auto', width: '100%'}}
+                        value={value || placeholder}
+                        rows='1'
+                        {...otherProps}
+                    />
+                </div>
+            </div>
+        );
+    }
+}
\ No newline at end of file
diff --git a/webapp/components/edit_post_modal.jsx b/webapp/components/edit_post_modal.jsx
index cd33dd113..6ed2b81b2 100644
--- a/webapp/components/edit_post_modal.jsx
+++ b/webapp/components/edit_post_modal.jsx
@@ -156,6 +156,8 @@ export default class EditPostModal extends React.Component {
 
     onModalShown() {
         this.refs.editbox.focus();
+
+        this.refs.editbox.recalculateSize();
     }
 
     onModalHide() {
diff --git a/webapp/components/suggestion/suggestion_box.jsx b/webapp/components/suggestion/suggestion_box.jsx
index 590fdae04..21bfd3dc3 100644
--- a/webapp/components/suggestion/suggestion_box.jsx
+++ b/webapp/components/suggestion/suggestion_box.jsx
@@ -9,7 +9,7 @@ import * as GlobalActions from 'actions/global_actions.jsx';
 import SuggestionStore from 'stores/suggestion_store.jsx';
 import * as Utils from 'utils/utils.jsx';
 
-import TextareaAutosize from 'react-autosize-textarea';
+import AutosizeTextarea from 'components/autosize_textarea.jsx';
 
 const KeyCodes = Constants.KeyCodes;
 
@@ -46,14 +46,17 @@ export default class SuggestionBox extends React.Component {
     }
 
     getTextbox() {
-        // this is to support old code that looks at the input/textarea DOM nodes
-        let textbox = this.refs.textbox;
-
-        if (!(textbox instanceof HTMLElement)) {
-            textbox = ReactDOM.findDOMNode(textbox);
+        if (this.props.type === 'textarea') {
+            return this.refs.textbox.getDOMNode();
         }
 
-        return textbox;
+        return this.refs.textbox;
+    }
+
+    recalculateSize() {
+        if (this.props.type === 'textarea') {
+            this.refs.textbox.recalculateSize();
+        }
     }
 
     handleDocumentClick(e) {
@@ -71,7 +74,7 @@ export default class SuggestionBox extends React.Component {
     }
 
     handleChange(e) {
-        const textbox = ReactDOM.findDOMNode(this.refs.textbox);
+        const textbox = this.getTextbox();
         const caret = Utils.getCaretPosition(textbox);
         const pretext = textbox.value.substring(0, caret);
 
@@ -83,7 +86,7 @@ export default class SuggestionBox extends React.Component {
     }
 
     handleCompleteWord(term, matchedPretext) {
-        const textbox = ReactDOM.findDOMNode(this.refs.textbox);
+        const textbox = this.getTextbox();
         const caret = Utils.getCaretPosition(textbox);
         const text = this.props.value;
         const pretext = text.substring(0, caret);
@@ -150,48 +153,57 @@ export default class SuggestionBox extends React.Component {
     }
 
     render() {
+        const {
+            type,
+            listComponent,
+            listStyle,
+            renderDividers,
+            ...props
+        } = this.props;
+
         let textbox = null;
-        if (this.props.type === 'input') {
+        if (type === 'input') {
             textbox = (
                 <input
                     ref='textbox'
                     type='text'
-                    {...this.props}
-                    onChange={this.handleChange}
+                    {...props}
+                    onInput={this.handleChange}
                     onKeyDown={this.handleKeyDown}
                 />
             );
-        } else if (this.props.type === 'search') {
+        } else if (type === 'search') {
             textbox = (
                 <input
                     ref='textbox'
                     type='search'
-                    {...this.props}
-                    onChange={this.handleChange}
+                    {...props}
+                    onInput={this.handleChange}
                     onKeyDown={this.handleKeyDown}
                 />
             );
-        } else if (this.props.type === 'textarea') {
+        } else if (type === 'textarea') {
             textbox = (
-                <TextareaAutosize
+                <AutosizeTextarea
                     id={this.suggestionId}
                     ref='textbox'
-                    {...this.props}
-                    onChange={this.handleChange}
+                    {...props}
+                    onInput={this.handleChange}
                     onKeyDown={this.handleKeyDown}
                 />
             );
         }
 
-        const SuggestionListComponent = this.props.listComponent;
+        // This needs to be upper case so React doesn't think it's an html tag
+        const SuggestionListComponent = listComponent;
 
         return (
             <div>
                 {textbox}
                 <SuggestionListComponent
                     suggestionId={this.suggestionId}
-                    location={this.props.listStyle}
-                    renderDividers={this.props.renderDividers}
+                    location={listStyle}
+                    renderDividers={renderDividers}
                 />
             </div>
         );
diff --git a/webapp/components/textbox.jsx b/webapp/components/textbox.jsx
index f11ef20ad..9192cd4f9 100644
--- a/webapp/components/textbox.jsx
+++ b/webapp/components/textbox.jsx
@@ -25,6 +25,7 @@ export default class Textbox extends React.Component {
         super(props);
 
         this.focus = this.focus.bind(this);
+        this.recalculateSize = this.recalculateSize.bind(this);
         this.getStateFromStores = this.getStateFromStores.bind(this);
         this.onRecievedError = this.onRecievedError.bind(this);
         this.handleKeyPress = this.handleKeyPress.bind(this);
@@ -91,13 +92,10 @@ export default class Textbox extends React.Component {
         }
     }
 
-    handleHeightChange(height) {
-        const textbox = $(this.refs.message.getTextbox());
+    handleHeightChange(height, maxHeight) {
         const wrapper = $(this.refs.wrapper);
 
-        const maxHeight = parseInt(textbox.css('max-height'), 10);
-
-        // move over attachment icon to compensate for the scrollbar
+        // Move over attachment icon to compensate for the scrollbar
         if (height > maxHeight) {
             wrapper.closest('.post-body__cell').addClass('scroll');
         } else {
@@ -106,7 +104,14 @@ export default class Textbox extends React.Component {
     }
 
     focus() {
-        this.refs.message.getTextbox().focus();
+        const textbox = this.refs.message.getTextbox();
+
+        textbox.focus();
+        Utils.placeCaretAtEnd(textbox);
+    }
+
+    recalculateSize() {
+        this.refs.message.recalculateSize();
     }
 
     showPreview(e) {
diff --git a/webapp/package.json b/webapp/package.json
index 6e4a7c17a..338829559 100644
--- a/webapp/package.json
+++ b/webapp/package.json
@@ -24,7 +24,6 @@
     "perfect-scrollbar": "0.6.12",
     "react": "15.3.2",
     "react-addons-pure-render-mixin": "15.3.2",
-    "react-autosize-textarea": "0.3.3",
     "react-bootstrap": "0.30.3",
     "react-custom-scrollbars": "4.0.0",
     "react-dom": "15.3.2",
diff --git a/webapp/sass/components/_modal.scss b/webapp/sass/components/_modal.scss
index 7a44e3b96..3faf78bc6 100644
--- a/webapp/sass/components/_modal.scss
+++ b/webapp/sass/components/_modal.scss
@@ -21,7 +21,7 @@
 
         .custom-textarea {
             max-height: 60vh;
-            min-height: 20em;
+            min-height: 8em;
         }
 
         .suggestion-list {
diff --git a/webapp/sass/layout/_post.scss b/webapp/sass/layout/_post.scss
index efba5b6f1..4a995a4d6 100644
--- a/webapp/sass/layout/_post.scss
+++ b/webapp/sass/layout/_post.scss
@@ -22,31 +22,6 @@
     color: #d04444 !important;
 }
 
-.textarea-div {
-    border: 0;
-    color: rgba(0,0,0,0);
-    height: auto;
-    left: 1px;
-    line-height: 20px;
-    min-height: 36px;
-    position: absolute;
-    top: 0px;
-    white-space: pre-wrap;
-    word-break: break-word;
-    word-wrap: normal;
-}
-
-body.ios {
-    .textarea-div {
-        -webkit-overflow-scrolling: auto;
-        padding: 7px 17px 7px 15px;
-    }
-}
-
-.textarea-div::-webkit-scrollbar {
-    display: none;
-}
-
 .textarea-wrapper {
     min-height: 36px;
     position: relative;
@@ -390,7 +365,6 @@ body.ios {
 
         .custom-textarea {
             bottom: 0;
-            line-height: 1.5;
             max-height: 162px !important;
             padding-right: 28px;
             padding-top: 8px;