make a edit text out of content editable

src/web/home.coffee

@@ -1,5 +1,5 @@
 import React from "react"
-import "./styles/home.scss"
+import Pastebin from "./pastebin"
 
 class Home extends React.Component
   constructor: (props) ->
@@ -8,6 +8,7 @@ class Home extends React.Component
   render: ->
     <div className="content-wrapper">
       <div className="content">
+        <Pastebin />
       </div>
     </div>
 

src/web/pastebin.coffee

@@ -0,0 +1,24 @@
+import React from "react"
+import ContentEditable from "./util/contentEditable"
+
+class Pastebin extends React.Component
+  constructor: (props) ->
+    super props
+    @state =
+      text: ""
+
+  onEditTextUpdate: (ev) =>
+    console.log ev.target.value
+    @setState
+      text: ev.target.value
+
+  render: ->
+    <div className="content-pastebin">
+      <ContentEditable
+        className="content-pastebin-edit"
+        onUpdate={@onEditTextUpdate}
+        value={@state.text}
+        plainText/>
+    </div>
+
+export default Pastebin

src/web/styles/contentEditable.scss

@@ -0,0 +1,15 @@
+.editable {
+    display: block;
+    white-space: pre-wrap;
+    overflow-wrap: break-word;
+    word-wrap: break-word;
+    padding: 10px;
+    outline: none;
+    border: 1px solid $editable-color;
+    border-radius: $editable-radius;
+    transition: border-color 0.4s linear;
+}
+
+.editable:focus {
+    border-color: $editable-color-active;
+}

src/web/styles/home.scss

@@ -1,8 +1,3 @@
-$content-padding: 100px;
-$content-width: 1000px;
-$content-height: 600px;
-$content-total-height: $content-height + 2 * $content-padding;
-
 .content-wrapper {
     width: 100vw;
     padding-top: $content-padding;
@@ -18,7 +13,8 @@ $content-total-height: $content-height + 2 * $content-padding;
     width: $content-width;
     height: $content-height;
     box-shadow: 0 2px 5px 5px rgba(0, 0, 0, 0.15);
-    border-radius: 20px;
+    border-radius: $content-radius;
+    padding: $content-radius;
 }
 
 /*

src/web/styles/index.scss

@@ -1,3 +1,10 @@
+// -- Prelude --
+@import './vars.scss';
+// -- Styles --
+@import './contentEditable.scss';
+@import './home.scss';
+@import './pastebin.scss';
+
 body, html {
     margin: 0px;
     padding: 0px;

src/web/styles/pastebin.scss

@@ -0,0 +1,14 @@
+.content-pastebin {
+    display: block;
+    height: 100%;
+    width: 100%;
+}
+
+.content-pastebin-edit {
+    display: block;
+    height: 100%;
+    width: 100%;
+    overflow-y: auto;
+    text-align: left;
+    box-sizing: border-box;
+}

src/web/styles/vars.scss

@@ -0,0 +1,10 @@
+// Configurations for contentEditable
+$editable-color: rgba(0, 0, 0, 0.1);
+$editable-color-active: rgba(0, 0, 0, 0.2);
+$editable-radius: 5px;
+// Dimensions of main content card
+$content-padding: 100px;
+$content-width: 1000px;
+$content-height: 600px;
+$content-total-height: $content-height + 2 * $content-padding;
+$content-radius: 20px;

src/web/util/contentEditable.coffee

@@ -0,0 +1,60 @@
+import React from "react"
+import ReactDOM from "react-dom"
+
+# Wrapper for a content-editable div
+# <https://stackoverflow.com/questions/22677931/react-js-onchange-event-for-contenteditable>
+class ContentEditable extends React.Component
+  constructor: (props) ->
+    super props
+
+  getText: ->
+    if @props.plainText then @domNode.innerText else @domNode.innerHTML
+
+  setText: (text) ->
+    if @props.plainText
+      @domNode.innerText = text
+    else
+      @domNode.innerHTML = text
+
+  componentDidMount: ->
+    @domNode = ReactDOM.findDOMNode @
+
+  componentWillUnmount: ->
+    @domNode = null
+
+  shouldComponentUpdate: (nextProps) ->
+    nextProps.value != @getText()
+
+  componentDidUpdate: ->
+    if @props.value != @getText()
+      @setText @props.value
+
+  emitUpdate: =>
+    if @props.onUpdate
+      # Note that the parent is expected to send the content back to us
+      # via `@props.value`
+      @props.onUpdate
+        target:
+          value: @getText()
+
+  onPaste: (ev) =>
+    return false if not @props.plainText
+    # <https://developer.mozilla.org/en-US/docs/Web/API/Element/paste_event>
+    paste = (event.clipboardData || window.clipboardData).getData 'text'
+    selection = window.getSelection()
+    return false if not selection.rangeCount
+    selection.deleteFromDocument()
+    selection.getRangeAt 0
+            .insertNode document.createTextNode paste
+    ev.preventDefault()
+
+  render: ->
+    <div
+      className={"#{@props.className} editable"}
+      onInput={@emitUpdate}
+      onBlur={@emitUpdate}
+      onPaste={@onPaste}
+      spellCheck={false}
+      contentEditable/>
+
+export default ContentEditable