用手机来实现远程控制是不是很酷?你不需要去写一个APP应用来实现这种功能-现在的手机浏览器已经支出了web socket技术,这提供了很多的可能。
这篇文章我们将用Node.js和Socket.io来实现手机控制PC的效果。
我们不必到处寻找基于HTML5的这种应用库。我们将使用Reveal.js-它来处理幻灯片动画效果,并支持键盘和触摸事件。
我们不必自己来实现远程控制的接口,我们将实现手机和电脑的同步。这样不仅能控制进度,也能同步的显示在你的手机上。
技术上很简单。Reveal.js让当前的幻灯片序号在URL的hash上(e.g. http://example.com/#/1
).我们将这个hash发送到所有连接的设备上,
对应的将会根据这个hash来自动的显示响应幻灯片。这样的话,别人可以方便的直接通过url来直接访问到显示的页面,所有我们需要输入一个验证码
在连接之前进行验证。
要说的是Reveal.js已经有一套API,我们可以直接调用来同步。但是hash变化的技术很简单,我们可以直接来实现。
你可以本地运行示例,或者部署到能提供node.js环境的服务器上。本地运行更简单些,但是必须本地有node.js并执行npm install
.
下载示例代码
确保本地已经安装node.js。如果没有,请安装
解压刚才下载的代码包
打开终端进入相应的文件夹
运行npm install
来安装依赖包
运行node app.js
来启动应用
PC端在浏览器打开http://localhost:8080
,并输入连接码(默认是kittens
)
在手机端浏览器打开http://<your computer’s local ip address>
,并输入连接码
请享受
思路说完,让我们来看看代码。这主要涉及2个js文件-app.js服务端控制,script.js浏览器端。你可以运行这个应用在Node.js 1.10+或者io.js.
后端,我们用到了express和Socket.io.它主要用来响应socket.io的事件监听。用express.static来让public下的文件可以访问到。public/index.html
文件保护显示的代码。express.static将会让它自动显示,所以我们不需要/
来路由。
app.js
// This is the server-side file of our mobile remote controller app.// It initializes socket.io and a new express instance.// Start it by running 'node app.js' from your terminal.// Creating an express servervar express = require('express'),
app = express();// This is needed if the app is run on heroku and other cloud providers:var port = process.env.PORT || 8080;// Initialize a new socket.io object. It is bound to// the express app, which allows them to coexist.var io = require('socket.io').listen(app.listen(port));// App Configuration// Make the files in the public folder available to the worldapp.use(express.static(__dirname + '/public'));// This is a secret key that prevents others from opening your presentation// and controlling it. Change it to something that only you know.var secret = 'kittens';// Initialize a new socket.io applicationvar presentation = io.on('connection', function (socket) { // A new client has come online. Check the secret key and
// emit a "granted" or "denied" message.
socket.on('load', function(data){
socket.emit('access', {
access: (data.key === secret ? "granted" : "denied")
});
}); // Clients send the 'slide-changed' message whenever they navigate to a new slide.
socket.on('slide-changed', function(data){ // Check the secret key again
if(data.key === secret) { // Tell all connected clients to navigate to the new slide
presentation.emit('navigate', {
hash: data.hash
});
}
});
});
console.log('Your presentation is running on http://localhost:' + port);
下面是前端的js文件,将监听hashchange事件,并发送socket.io
消息到服务器端。
public/assets/js/script.js
$(function() { // Apply a CSS filter with our blur class (see our assets/css/styles.css)
var blurredElements = $('.homebanner, div.reveal').addClass('blur'); // Initialize the Reveal.js library with the default config options
// See more here https://github.com/hakimel/reveal.js#configuration
Reveal.initialize({
history: true // Every slide will change the URL
}); // Connect to the socket
var socket = io(); // Variable initialization
var form = $('form.login'),
secretTextBox = form.find('input[type=text]'); var key = "", animationTimeout; // When the page is loaded it asks you for a key and sends it to the server
form.submit(function(e){
e.preventDefault();
key = secretTextBox.val().trim(); // If there is a key, send it to the server-side
// through the socket.io channel with a 'load' event.
if(key.length) {
socket.emit('load', {
key: key
});
}
}); // The server will either grant or deny access, depending on the secret key
socket.on('access', function(data){ // Check if we have "granted" access.
// If we do, we can continue with the presentation.
if(data.access === "granted") { // Unblur everything
blurredElements.removeClass('blurred');
form.hide(); var ignore = false;
$(window).on('hashchange', function(){ // Notify other clients that we have navigated to a new slide
// by sending the "slide-changed" message to socket.io
if(ignore){ // You will learn more about "ignore" in a bit
return;
} var hash = window.location.hash;
socket.emit('slide-changed', {
hash: hash,
key: key
});
});
socket.on('navigate', function(data){ // Another device has changed its slide. Change it in this browser, too:
window.location.hash = data.hash; // The "ignore" variable stops the hash change from
// triggering our hashchange handler above and sending
// us into a never-ending cycle.
ignore = true;
setInterval(function () {
ignore = false;
},100);
});
} else { // Wrong secret key
clearTimeout(animationTimeout); // Addding the "animation" class triggers the CSS keyframe
// animation that shakes the text input.
secretTextBox.addClass('denied animation');
animationTimeout = setTimeout(function(){
secretTextBox.removeClass('animation');
}, 1000);
form.show();
}
});
});
手机远程访问控制已经可以了。希望你能从中得到有趣的体验。
参考:
http://tutorialzine.com/2015/02/smartphone-remote-control-for-presentations/
https://github.com/hakimel/reveal.js/wiki/Example-Presentations
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