From e78f375e8185dafe007147d1f6b8ac1611fe885c Mon Sep 17 00:00:00 2001
From: Yunjie Chen <rothleer@outlook.com>
Date: Sat, 8 Jun 2019 12:10:40 +0800
Subject: [PATCH] markdown: add copy button to code blocks to copy source text

---
 src/resources/common.css                | 37 +++++++++++++++++++++++++
 src/resources/hoedown.js                |  1 +
 src/resources/markdown-it.js            |  1 +
 src/resources/markdown_template.html    |  1 +
 src/resources/markdown_template.js      | 24 +++++++++++++++-
 src/resources/marked.js                 |  1 +
 src/resources/showdown.js               |  1 +
 src/utils/clipboard.js/README.md        |  2 ++
 src/utils/clipboard.js/clipboard.min.js |  7 +++++
 src/utils/vutils.cpp                    | 12 ++++++++
 src/vnote.qrc                           |  1 +
 11 files changed, 87 insertions(+), 1 deletion(-)
 create mode 100644 src/utils/clipboard.js/README.md
 create mode 100644 src/utils/clipboard.js/clipboard.min.js

diff --git a/src/resources/common.css b/src/resources/common.css
index 9551995b..6518f21d 100644
--- a/src/resources/common.css
+++ b/src/resources/common.css
@@ -208,3 +208,40 @@ span.modal-close:focus {
     content: attr(data-anchor-icon);
 }
 /* Anchor */
+
+/* Button */
+.vnote-btn {
+    position: relative;
+    display: inline-block;
+    padding: 6px 12px;
+    font-size: 13px;
+    font-weight: 700;
+    line-height: 20px;
+    white-space: nowrap;
+    vertical-align: middle;
+    cursor: pointer;
+    border: none;
+    -webkit-user-select: none;
+    -moz-user-select: none;
+    -ms-user-select: none;
+    user-select: none;
+    -webkit-appearance: none;
+}
+
+.vnote-copy-clipboard-btn {
+    transition: opacity .3s ease-in-out;
+    opacity: 0;
+    padding: 2px 6px;
+    position: absolute;
+    top: 5px;
+    right: 5px;
+}
+
+pre:hover .vnote-copy-clipboard-btn {
+    opacity: 1;
+}
+
+pre.vnote-snippet {
+    position: relative;
+}
+/* Button */
diff --git a/src/resources/hoedown.js b/src/resources/hoedown.js
index 1ac593f7..308e8612 100644
--- a/src/resources/hoedown.js
+++ b/src/resources/hoedown.js
@@ -91,6 +91,7 @@ var updateHtml = function(html) {
     }
 
     addClassToCodeBlock();
+    addCopyButtonToCodeBlock();
     renderCodeBlockLineNumber();
 
     // If you add new logics after handling MathJax, please pay attention to
diff --git a/src/resources/markdown-it.js b/src/resources/markdown-it.js
index 58eff9da..0435c361 100644
--- a/src/resources/markdown-it.js
+++ b/src/resources/markdown-it.js
@@ -175,6 +175,7 @@ var updateText = function(text) {
     renderPlantUML('lang-puml');
     renderGraphviz('lang-dot');
     addClassToCodeBlock();
+    addCopyButtonToCodeBlock();
     renderCodeBlockLineNumber();
 
     // If you add new logics after handling MathJax, please pay attention to
diff --git a/src/resources/markdown_template.html b/src/resources/markdown_template.html
index 4e2f36b2..0850bb3d 100644
--- a/src/resources/markdown_template.html
+++ b/src/resources/markdown_template.html
@@ -27,6 +27,7 @@
     <link rel="stylesheet" type="text/css" href="HIGHLIGHTJS_CSS_PLACE_HOLDER">
     <script src="qrc:/resources/qwebchannel.js"></script>
     <script src="qrc:/utils/highlightjs/highlight.pack.js"></script>
+    <script src="qrc:/utils/clipboard.js/clipboard.min.js"></script>
     <!-- EXTRA_PLACE_HOLDER -->
     <script src="JS_PLACE_HOLDER" defer></script>
     <script src="qrc:/resources/common.js" defer></script>
diff --git a/src/resources/markdown_template.js b/src/resources/markdown_template.js
index ea1cde5b..15355043 100644
--- a/src/resources/markdown_template.js
+++ b/src/resources/markdown_template.js
@@ -23,6 +23,8 @@ var VPlantUMLDivClass = 'plantuml-diagram';
 var VMetaDataCodeClass = 'markdown-metadata';
 var VMarkRectDivClass = 'mark-rect';
 
+var hljsClass = 'hljs';
+
 var VPreviewMode = false;
 
 if (typeof VEnableMermaid == 'undefined') {
@@ -272,6 +274,10 @@ window.onwheel = function(e) {
 
 var skipScrollCheckRange = null;
 
+window.addEventListener('load', function() {
+    new ClipboardJS('.vnote-copy-clipboard-btn');
+});
+
 window.onscroll = function() {
     if (g_muteScroll) {
         return;
@@ -1247,7 +1253,6 @@ var renderCodeBlockLineNumber = function() {
 };
 
 var addClassToCodeBlock = function() {
-    var hljsClass = 'hljs';
     var codes = document.getElementsByTagName('code');
     for (var i = 0; i < codes.length; ++i) {
         var code = codes[i];
@@ -1267,6 +1272,23 @@ var addClassToCodeBlock = function() {
     }
 };
 
+var addCopyButtonToCodeBlock = function() {
+    var codes = document.getElementsByClassName(hljsClass);
+    for (var i = 0; i < codes.length; ++i) {
+        var code = codes[i];
+        var pare = code.parentElement;
+        pare.classList.add('vnote-snippet');
+
+        var btn = document.createElement('button');
+        btn.innerHTML = '&#x1f4cb;';
+        btn.classList.add('vnote-btn');
+        btn.classList.add('vnote-copy-clipboard-btn');
+        btn.setAttribute('type', 'button');
+        btn.setAttribute('data-clipboard-text', code.textContent);
+        code.insertAdjacentElement('beforebegin', btn);
+    }
+};
+
 var listContainsRegex = function(strs, exp) {
     for (var i = 0, len = strs.length; i < len; ++i) {
         if (exp.test(strs[i])) {
diff --git a/src/resources/marked.js b/src/resources/marked.js
index 206cef9c..78688edf 100644
--- a/src/resources/marked.js
+++ b/src/resources/marked.js
@@ -71,6 +71,7 @@ var updateText = function(text) {
     renderPlantUML('language-puml');
     renderGraphviz('language-dot');
     addClassToCodeBlock();
+    addCopyButtonToCodeBlock();
     renderCodeBlockLineNumber();
 
     // If you add new logics after handling MathJax, please pay attention to
diff --git a/src/resources/showdown.js b/src/resources/showdown.js
index 6e37b5ee..ea04e2a6 100644
--- a/src/resources/showdown.js
+++ b/src/resources/showdown.js
@@ -126,6 +126,7 @@ var updateText = function(text) {
     renderPlantUML('language-puml');
     renderGraphviz('language-dot');
     addClassToCodeBlock();
+    addCopyButtonToCodeBlock();
     renderCodeBlockLineNumber();
 
     // If you add new logics after handling MathJax, please pay attention to
diff --git a/src/utils/clipboard.js/README.md b/src/utils/clipboard.js/README.md
new file mode 100644
index 00000000..61bfead3
--- /dev/null
+++ b/src/utils/clipboard.js/README.md
@@ -0,0 +1,2 @@
+# [clipboard.js](https://github.com/zenorocha/clipboard.js)
+v2.0.4
diff --git a/src/utils/clipboard.js/clipboard.min.js b/src/utils/clipboard.js/clipboard.min.js
new file mode 100644
index 00000000..02c549e3
--- /dev/null
+++ b/src/utils/clipboard.js/clipboard.min.js
@@ -0,0 +1,7 @@
+/*!
+ * clipboard.js v2.0.4
+ * https://zenorocha.github.io/clipboard.js
+ * 
+ * Licensed MIT © Zeno Rocha
+ */
+!function(t,e){"object"==typeof exports&&"object"==typeof module?module.exports=e():"function"==typeof define&&define.amd?define([],e):"object"==typeof exports?exports.ClipboardJS=e():t.ClipboardJS=e()}(this,function(){return function(n){var o={};function r(t){if(o[t])return o[t].exports;var e=o[t]={i:t,l:!1,exports:{}};return n[t].call(e.exports,e,e.exports,r),e.l=!0,e.exports}return r.m=n,r.c=o,r.d=function(t,e,n){r.o(t,e)||Object.defineProperty(t,e,{enumerable:!0,get:n})},r.r=function(t){"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(t,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(t,"__esModule",{value:!0})},r.t=function(e,t){if(1&t&&(e=r(e)),8&t)return e;if(4&t&&"object"==typeof e&&e&&e.__esModule)return e;var n=Object.create(null);if(r.r(n),Object.defineProperty(n,"default",{enumerable:!0,value:e}),2&t&&"string"!=typeof e)for(var o in e)r.d(n,o,function(t){return e[t]}.bind(null,o));return n},r.n=function(t){var e=t&&t.__esModule?function(){return t.default}:function(){return t};return r.d(e,"a",e),e},r.o=function(t,e){return Object.prototype.hasOwnProperty.call(t,e)},r.p="",r(r.s=0)}([function(t,e,n){"use strict";var r="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(t){return typeof t}:function(t){return t&&"function"==typeof Symbol&&t.constructor===Symbol&&t!==Symbol.prototype?"symbol":typeof t},i=function(){function o(t,e){for(var n=0;n<e.length;n++){var o=e[n];o.enumerable=o.enumerable||!1,o.configurable=!0,"value"in o&&(o.writable=!0),Object.defineProperty(t,o.key,o)}}return function(t,e,n){return e&&o(t.prototype,e),n&&o(t,n),t}}(),a=o(n(1)),c=o(n(3)),u=o(n(4));function o(t){return t&&t.__esModule?t:{default:t}}var l=function(t){function o(t,e){!function(t,e){if(!(t instanceof e))throw new TypeError("Cannot call a class as a function")}(this,o);var n=function(t,e){if(!t)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return!e||"object"!=typeof e&&"function"!=typeof e?t:e}(this,(o.__proto__||Object.getPrototypeOf(o)).call(this));return n.resolveOptions(e),n.listenClick(t),n}return function(t,e){if("function"!=typeof e&&null!==e)throw new TypeError("Super expression must either be null or a function, not "+typeof e);t.prototype=Object.create(e&&e.prototype,{constructor:{value:t,enumerable:!1,writable:!0,configurable:!0}}),e&&(Object.setPrototypeOf?Object.setPrototypeOf(t,e):t.__proto__=e)}(o,c.default),i(o,[{key:"resolveOptions",value:function(){var t=0<arguments.length&&void 0!==arguments[0]?arguments[0]:{};this.action="function"==typeof t.action?t.action:this.defaultAction,this.target="function"==typeof t.target?t.target:this.defaultTarget,this.text="function"==typeof t.text?t.text:this.defaultText,this.container="object"===r(t.container)?t.container:document.body}},{key:"listenClick",value:function(t){var e=this;this.listener=(0,u.default)(t,"click",function(t){return e.onClick(t)})}},{key:"onClick",value:function(t){var e=t.delegateTarget||t.currentTarget;this.clipboardAction&&(this.clipboardAction=null),this.clipboardAction=new a.default({action:this.action(e),target:this.target(e),text:this.text(e),container:this.container,trigger:e,emitter:this})}},{key:"defaultAction",value:function(t){return s("action",t)}},{key:"defaultTarget",value:function(t){var e=s("target",t);if(e)return document.querySelector(e)}},{key:"defaultText",value:function(t){return s("text",t)}},{key:"destroy",value:function(){this.listener.destroy(),this.clipboardAction&&(this.clipboardAction.destroy(),this.clipboardAction=null)}}],[{key:"isSupported",value:function(){var t=0<arguments.length&&void 0!==arguments[0]?arguments[0]:["copy","cut"],e="string"==typeof t?[t]:t,n=!!document.queryCommandSupported;return e.forEach(function(t){n=n&&!!document.queryCommandSupported(t)}),n}}]),o}();function s(t,e){var n="data-clipboard-"+t;if(e.hasAttribute(n))return e.getAttribute(n)}t.exports=l},function(t,e,n){"use strict";var o,r="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(t){return typeof t}:function(t){return t&&"function"==typeof Symbol&&t.constructor===Symbol&&t!==Symbol.prototype?"symbol":typeof t},i=function(){function o(t,e){for(var n=0;n<e.length;n++){var o=e[n];o.enumerable=o.enumerable||!1,o.configurable=!0,"value"in o&&(o.writable=!0),Object.defineProperty(t,o.key,o)}}return function(t,e,n){return e&&o(t.prototype,e),n&&o(t,n),t}}(),a=n(2),c=(o=a)&&o.__esModule?o:{default:o};var u=function(){function e(t){!function(t,e){if(!(t instanceof e))throw new TypeError("Cannot call a class as a function")}(this,e),this.resolveOptions(t),this.initSelection()}return i(e,[{key:"resolveOptions",value:function(){var t=0<arguments.length&&void 0!==arguments[0]?arguments[0]:{};this.action=t.action,this.container=t.container,this.emitter=t.emitter,this.target=t.target,this.text=t.text,this.trigger=t.trigger,this.selectedText=""}},{key:"initSelection",value:function(){this.text?this.selectFake():this.target&&this.selectTarget()}},{key:"selectFake",value:function(){var t=this,e="rtl"==document.documentElement.getAttribute("dir");this.removeFake(),this.fakeHandlerCallback=function(){return t.removeFake()},this.fakeHandler=this.container.addEventListener("click",this.fakeHandlerCallback)||!0,this.fakeElem=document.createElement("textarea"),this.fakeElem.style.fontSize="12pt",this.fakeElem.style.border="0",this.fakeElem.style.padding="0",this.fakeElem.style.margin="0",this.fakeElem.style.position="absolute",this.fakeElem.style[e?"right":"left"]="-9999px";var n=window.pageYOffset||document.documentElement.scrollTop;this.fakeElem.style.top=n+"px",this.fakeElem.setAttribute("readonly",""),this.fakeElem.value=this.text,this.container.appendChild(this.fakeElem),this.selectedText=(0,c.default)(this.fakeElem),this.copyText()}},{key:"removeFake",value:function(){this.fakeHandler&&(this.container.removeEventListener("click",this.fakeHandlerCallback),this.fakeHandler=null,this.fakeHandlerCallback=null),this.fakeElem&&(this.container.removeChild(this.fakeElem),this.fakeElem=null)}},{key:"selectTarget",value:function(){this.selectedText=(0,c.default)(this.target),this.copyText()}},{key:"copyText",value:function(){var e=void 0;try{e=document.execCommand(this.action)}catch(t){e=!1}this.handleResult(e)}},{key:"handleResult",value:function(t){this.emitter.emit(t?"success":"error",{action:this.action,text:this.selectedText,trigger:this.trigger,clearSelection:this.clearSelection.bind(this)})}},{key:"clearSelection",value:function(){this.trigger&&this.trigger.focus(),window.getSelection().removeAllRanges()}},{key:"destroy",value:function(){this.removeFake()}},{key:"action",set:function(){var t=0<arguments.length&&void 0!==arguments[0]?arguments[0]:"copy";if(this._action=t,"copy"!==this._action&&"cut"!==this._action)throw new Error('Invalid "action" value, use either "copy" or "cut"')},get:function(){return this._action}},{key:"target",set:function(t){if(void 0!==t){if(!t||"object"!==(void 0===t?"undefined":r(t))||1!==t.nodeType)throw new Error('Invalid "target" value, use a valid Element');if("copy"===this.action&&t.hasAttribute("disabled"))throw new Error('Invalid "target" attribute. 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\ No newline at end of file
diff --git a/src/utils/vutils.cpp b/src/utils/vutils.cpp
index c9947f2b..82875f2a 100644
--- a/src/utils/vutils.cpp
+++ b/src/utils/vutils.cpp
@@ -943,6 +943,18 @@ with 2em, if there are Chinese characters in it, the font will be a mess.
         extra += QString("<script type=\"text/javascript\">\n%1\n</script>\n").arg(js);
     }
 
+    // Clipboard.js.
+    {
+    const QString clipboardjs(":/utils/clipboard.js/clipboard.min.js");
+    QString js = VUtils::readFileFromDisk(clipboardjs);
+    extra += QString("<script type=\"text/javascript\">\n%1\n</script>\n").arg(js);
+    extra += "<script type=\"text/javascript\">"
+                 "window.addEventListener('load', function() {"
+                     "new ClipboardJS('.vnote-copy-clipboard-btn');"
+                 "});"
+             "</script>\n";
+    }
+
     if (!extra.isEmpty()) {
         templ.replace(HtmlHolder::c_extraHolder, extra);
     }
diff --git a/src/vnote.qrc b/src/vnote.qrc
index e4cc7774..d7f492af 100644
--- a/src/vnote.qrc
+++ b/src/vnote.qrc
@@ -287,5 +287,6 @@
         <file>resources/icons/table.svg</file>
         <file>utils/wavedrom/wavedrom.min.js</file>
         <file>utils/wavedrom/wavedrom-theme.js</file>
+        <file>utils/clipboard.js/clipboard.min.js</file>
     </qresource>
 </RCC>