clipboard button is added

browser/components/MarkdownPreview.js

@@ -9,6 +9,7 @@ import SequenceDiagram from 'js-sequence-diagrams'
 import eventEmitter from 'browser/main/lib/eventEmitter'
 import fs from 'fs'
 import htmlTextHelper from 'browser/lib/htmlTextHelper'
+import copy from 'copy-to-clipboard'
 
 const { remote } = require('electron')
 const { app } = remote
@@ -46,6 +47,24 @@ code {
   font-family: ${codeBlockFontFamily.join(', ')};
 }
 
+.clipboardButton {
+  color: #939395;
+  fill: #939395;
+  border-radius: 17px;
+  font-size: 14px;
+  margin: 13px 7px;
+  padding-top: 5px;
+  border: none;
+  background-color: transparent;
+  outline: none;
+  height: 34px;
+  width: 34px;
+}
+
+.clipboardButton:hover {
+  background-color: #D9D9D9;
+}
+
 h1, h2 {
   border: none;
 }
@@ -261,6 +280,12 @@ export default class MarkdownPreview extends React.Component {
       if (syntax == null) syntax = CodeMirror.findModeByName('Plain Text')
       CodeMirror.requireMode(syntax.mode, () => {
         let content = htmlTextHelper.decodeEntities(el.innerHTML)
+        const copyIcon = document.createElement('i')
+        copyIcon.innerHTML = '<button class="clipboardButton"><svg width="14" height="14" viewBox="0 0 1792 1792" ><path d="M768 1664h896v-640h-416q-40 0-68-28t-28-68v-416h-384v1152zm256-1440v-64q0-13-9.5-22.5t-22.5-9.5h-704q-13 0-22.5 9.5t-9.5 22.5v64q0 13 9.5 22.5t22.5 9.5h704q13 0 22.5-9.5t9.5-22.5zm256 672h299l-299-299v299zm512 128v672q0 40-28 68t-68 28h-960q-40 0-68-28t-28-68v-160h-544q-40 0-68-28t-28-68v-1344q0-40 28-68t68-28h1088q40 0 68 28t28 68v328q21 13 36 28l408 408q28 28 48 76t20 88z"/></svg></button>'
+        copyIcon.onclick = (e) => {
+          copy(content)
+        }
+        el.parentNode.appendChild(copyIcon)
         el.innerHTML = ''
         el.parentNode.className += ` cm-s-${codeBlockTheme} CodeMirror`
         CodeMirror.runMode(content, syntax.mime, el, {
@@ -357,4 +382,4 @@ MarkdownPreview.propTypes = {
   onMouseDown: PropTypes.func,
   className: PropTypes.string,
   value: PropTypes.string
-}
+}