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JSDK-2353 Adding an example for capturing screen using getDisplayMedia(). (#71)
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‎.gitignore‎

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@@ -53,10 +53,12 @@ examples/codecpreferences/public/index.js
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examples/localvideofilter/public/index.js
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examples/localvideosnapshot/public/index.js
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examples/mediadevices/public/index.js
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examples/screenshare/public/index.js
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# The generated helpers.js
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examples/bandwidthconstraints/public/helpers.js
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examples/codecpreferences/public/helpers.js
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examples/localvideofilter/public/helpers.js
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examples/localvideosnapshot/public/helpers.js
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examples/mediadevices/public/helpers.js
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examples/screenshare/public/helpers.js

‎examples/index.html‎

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@@ -67,7 +67,7 @@ <h4 class="card-header">
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</a>
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</div>
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</div>
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<div class="col-sm-6">
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<div class="col-sm-12">
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<div class="card-deck">
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<a class="card" href="/codecpreferences" style="text-decoration: none">
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<h4 class="card-header">
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</p>
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</div>
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</a>
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<a class="card" href="/screenshare" style="text-decoration: none">
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<h4 class="card-header">
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Share Your Screen
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</h4>
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<div class="card-block">
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<p class="card-text">
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This app demonstrates how to capture your screen so that you can share it with other Participants
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in the Room.
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</p>
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</div>
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</a>
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</div>
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</div>
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</div>

‎examples/screenshare/public/index.css‎

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@import url('https://fonts.googleapis.com/css?family=Roboto+Mono:300');
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html {
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height: 100%;
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}
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body {
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height: 100%;
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}
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div.container-fluid {
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height: 100%;
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}
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div.row {
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height: 100%;
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}
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div.row.thin-gutters {
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margin: 0 2px 0 2px;
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}
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div.row.thin-gutters > .col,
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div.row.thin-gutters > [class*="col-"] {
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padding: 0 2px;
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}
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div.col-sm-8, div.col-sm-4 {
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height: 100%;
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}
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pre.language-javascript {
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font-family: 'Roboto Mono', monospace;
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font-size: 13px;
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}
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pre.language-javascript a {
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color: aquamarine;
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text-decoration: underline;
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}
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pre.language-javascript a:hover {
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text-decoration: none;
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}
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div.card {
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border: none;
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overflow-y: auto;
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}
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div.col-sm-8 > .card {
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height: 100%;
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}
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div.col-sm-4 > .card:first-child {
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height: 30%;
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}
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div.col-sm-4 > .card:last-child {
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height: 70%;
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}
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video#screenpreview {
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background-color: lightgrey !important;
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background-image: url('https://static0.twilio.com/marketing/bundles/archetype/img/logo-wordmark.svg');
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background-position: 50%;
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background-repeat: no-repeat;
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}
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@media (max-width: 900px) {
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div.col-sm-8, div.col-sm-4 {
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max-width: 100%;
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flex: 100%;
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}
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div.col-sm-8 {
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height: 40%;
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}
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div.col-sm-4 {
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height: 60%;
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}
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pre.language-javascript {
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font-size: 12px;
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}
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}

‎examples/screenshare/public/index.html‎

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<!DOCTYPE html>
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<html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
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<title>Share Your Screen</title>
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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ" crossorigin="anonymous">
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<link rel="stylesheet" href="prism.css">
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<link rel="stylesheet" href="index.css">
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</head>
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<body>
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<div class="container-fluid">
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<div class="row thin-gutters">
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<div class="col-sm-6">
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<div class="card">
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<div class="card-block">
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<h4 class="card-title">
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Share Your Screen
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</h4>
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<pre class="language-javascript"></pre>
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</div>
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</div>
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</div>
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<div class="col-sm-6">
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<div class="card">
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<div class="card-block">
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<h4 class="card-title">Local Screen</h4>
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<video id="screenpreview" autoplay height="480" width="640"></video>
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<button id="capturescreen" class="btn btn-primary btn-block">Capture Screen</button>
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<button id="stopscreencapture" class="btn btn-primary btn-block">Stop Screen Capture</button>
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</div>
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</div>
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</div>
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</div>
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</div>
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<script src="index.js"></script>
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</body>
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</html>

‎examples/screenshare/public/prism.css‎

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/* http://prismjs.com/download.html?themes=prism-okaidia&languages=markup+css+clike+javascript */
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/**
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* okaidia theme for JavaScript, CSS and HTML
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* Loosely based on Monokai textmate theme by http://www.monokai.nl/
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* @author ocodia
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*/
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code[class*="language-"],
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pre[class*="language-"] {
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color: #f8f8f2;
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background: none;
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text-shadow: 0 1px rgba(0, 0, 0, 0.3);
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font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;
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text-align: left;
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white-space: pre;
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word-spacing: normal;
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word-break: normal;
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word-wrap: normal;
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line-height: 1.5;
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-moz-tab-size: 4;
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-o-tab-size: 4;
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tab-size: 4;
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-webkit-hyphens: none;
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-moz-hyphens: none;
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-ms-hyphens: none;
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hyphens: none;
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}
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/* Code blocks */
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pre[class*="language-"] {
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padding: 1em;
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margin: .5em 0;
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overflow: auto;
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border-radius: 0.3em;
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}
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:not(pre) > code[class*="language-"],
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pre[class*="language-"] {
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background: #272822;
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}
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/* Inline code */
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:not(pre) > code[class*="language-"] {
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padding: .1em;
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border-radius: .3em;
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white-space: normal;
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}
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.token.comment,
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.token.prolog,
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.token.doctype,
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.token.cdata {
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color: #87ceeb;
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}
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.token.operator,
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.token.punctuation {
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color: #ff5555;
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}
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.namespace {
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opacity: .7;
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}
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.token.property,
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.token.tag,
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.token.constant,
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.token.symbol,
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.token.deleted {
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color: #f92672;
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}
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.token.boolean {
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color: #55ff55;
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}
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.token.number {
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color: #cd5c5c;
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}
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.token.selector,
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.token.attr-name,
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.token.string,
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.token.char,
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.token.builtin,
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.token.inserted {
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color: #ff55ff;
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}
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.token.entity,
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.token.url,
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.language-css .token.string,
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.style .token.string,
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.token.variable {
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color: #ff55ff;
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}
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.token.function {
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color: #ccc;
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}
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.token.keyword {
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color: #55ff55;
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}
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.token.regex,
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.token.important {
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color: #fd971f;
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}
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.token.important,
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.token.bold {
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font-weight: bold;
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}
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.token.italic {
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font-style: italic;
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}
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.token.entity {
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cursor: help;
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}

‎examples/screenshare/src/helpers.js‎

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'use strict';
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const Video = require('twilio-video');
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/**
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* Create a LocalVideoTrack for your screen. You can then share it
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* with other Participants in the Room.
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* @param {number} height - Desired vertical resolution in pixels
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* @param {number} width - Desired horizontal resolution in pixels
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* @returns {Promise<LocalVideoTrack>}
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*/
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function createScreenTrack(height, width) {
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if (typeof navigator === 'undefined'
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|| !navigator.mediaDevices
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|| !navigator.mediaDevices.getDisplayMedia) {
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return Promise.reject(new Error('getDisplayMedia is not supported'));
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}
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return navigator.mediaDevices.getDisplayMedia({
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video: {
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height: height,
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width: width
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}
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}).then(function(stream) {
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return new Video.LocalVideoTrack(stream.getVideoTracks()[0]);
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});
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}
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exports.createScreenTrack = createScreenTrack;

‎examples/screenshare/src/index.js‎

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'use strict';
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const Prism = require('prismjs');
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const getSnippet = require('../../util/getsnippet');
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const helpers = require('./helpers');
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const createScreenTrack = helpers.createScreenTrack;
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const captureScreen = document.querySelector('button#capturescreen');
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const screenPreview = document.querySelector('video#screenpreview');
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const stopScreenCapture = document.querySelector('button#stopscreencapture');
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(async function() {
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// Load the code snippet.
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const snippet = await getSnippet('./helpers.js');
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const pre = document.querySelector('pre.language-javascript');
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pre.innerHTML = Prism.highlight(snippet, Prism.languages.javascript);
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// Hide the "Stop Capture Screen" button.
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stopScreenCapture.style.display = 'none';
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// The LocalVideoTrack for your screen.
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let screenTrack;
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captureScreen.onclick = async function() {
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try {
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// Create and preview your local screen.
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screenTrack = await createScreenTrack(720, 1280);
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screenTrack.attach(screenPreview);
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// Show the "Capture Screen" button after screen capture stops.
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screenTrack.on('stopped', toggleButtons);
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// Show the "Stop Capture Screen" button.
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toggleButtons();
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} catch (e) {
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alert(e.message);
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}
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};
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stopScreenCapture.onclick = function() {
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// Stop capturing your screen.
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screenTrack.stop();
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}
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}());
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function toggleButtons() {
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captureScreen.style.display = captureScreen.style.display === 'none' ? '' : 'none';
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stopScreenCapture.style.display = stopScreenCapture.style.display === 'none' ? '' : 'none';
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}

‎package.json‎

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"build:examples:localvideofilter": "copyfiles -f examples/localvideofilter/src/helpers.js examples/localvideofilter/public && browserify examples/localvideofilter/src/index.js > examples/localvideofilter/public/index.js",
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"build:examples:localvideosnapshot": "copyfiles -f examples/localvideosnapshot/src/helpers.js examples/localvideosnapshot/public && browserify examples/localvideosnapshot/src/index.js > examples/localvideosnapshot/public/index.js",
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"build:examples:mediadevices": "copyfiles -f examples/mediadevices/src/helpers.js examples/mediadevices/public && browserify examples/mediadevices/src/index.js > examples/mediadevices/public/index.js",
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"build:examples:screenshare": "copyfiles -f examples/screenshare/src/helpers.js examples/screenshare/public && browserify examples/screenshare/src/index.js > examples/screenshare/public/index.js",
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"build:quickstart": "browserify quickstart/src/index.js > quickstart/public/index.js",
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"clean": "npm-run-all clean:*",
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"clean:examples": "npm-run-all clean:examples:*",
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"clean:examples:localvideofilter": "rimraf examples/localvideofilter/public/index.js examples/localvideofilter/public/helpers.js",
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"clean:examples:localvideosnapshot": "rimraf examples/localvideosnapshot/public/index.js examples/localvideosnapshot/public/helpers.js",
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"clean:examples:mediadevices": "rimraf examples/mediadevices/public/index.js examples/mediadevices/public/helpers.js",
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"clean:examples:screenshare": "rimraf examples/screenshare/public/index.js examples/screenshare/public/helpers.js",
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"clean:quickstart": "rimraf quickstart/public/index.js",
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"start": "npm run clean && npm run build && node server"
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},

‎server/index.js‎

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'codecpreferences',
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'localvideofilter',
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'localvideosnapshot',
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'mediadevices'
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'mediadevices',
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'screenshare'
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].forEach(function(example) {
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var examplePath = path.join(__dirname, `../examples/${example}/public`);
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app.use(`/${example}`, express.static(examplePath));

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