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node-webkit教程(9)native api 之Tray(托盘)

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node-webkit教程(9)native api 之Tray(托盘)

文/玄魂

目录

node-webkit教程(9)native api 之Tray(托盘)

前言

9.1  Tray简介

9.2  tray的属性

9.3 tray 的构造函数

9.4  初始化一个tray

9.5 删除tray

9.6 小结

前言

几个月前，要开发一个简易的展示应用，要求支持离线播放（桌面应用）和在线播放（web应用）。

当时第一想到的是flex，同一套代码（或者只需少量的更改）就可以同时运行在桌面和浏览器上。由于很多展现效果要全新开发，我想到了impress.js(https://github.com/bartaz/impress.js/)。如果选择impress.js，就意味着要将html5作为桌面应用，当时想到要封装webkit，但是本人对这方面也不是很熟悉，时间也很有限，就又沿着这个方向搜索，找到了node-webkit(https://github.com/rogerwang/node-webkit)。

node-webkit 解决了我通过 html 和 js 来编写桌面应用的难题 。

至于node-webkit的定义，按照作者的说法：

“ 基于node.js和chromium的应用程序实时运行环境，可运行通过HTML(5)、CSS(3)、Javascript来编写的本地应用程序。node.js和webkit的结合体，webkit提供DOM操作，node.js提供本地化操作；且将二者的context完全整合，可在HTML代码中直接使用node.js的API。”

从本篇文章开始，为您介绍Platform Services些列的API，本系列由以下类别：

·             App – 每个应用运行时全局api

·             Clipboard – 剪贴板

·             Tray – 状态栏图标，消息通知

·             File dialogs-文件选择对话框

·             Shell – 桌面相关

·             Handling files and arguments-处理文件和相关参数

9.1  Tray简介

Tray在不同的平台下的展现形式不一样，通常以一个ICON的形式展现在操作系统状态通知的位置。在Mac下称之为Status Item，GTK环境下称为Status Icon，windows叫系统托盘。

新建tray.html 和package.json作为本文的示例程序。

tray.html内容如下：

<html>

<head>

<title>trayDemo</title>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

</head>

<body >

<h1>Tray 测试</h1>

<script>

// Load native UI library

var gui = require('nw.gui');

</script>

</body>

</html>

package.json内容如下：

{

"name": "tray-demo",

"main": "tray.html",

"nodejs":true,

"window": {

"title": "trayDemo",

"toolbar": true,

"width": 800,

"height": 600,

"resizable":true,

"show_in_taskbar":true,

"frame":true,

"kiosk":false,

"icon": "2655716405282662783.png"

},

"webkit":{

"plugin":true

}

}

9.2  tray的属性

Tray包含title、tooltip、icon、menu、alticon五个属性。

title属性只在mac系统下有效，会和icon图标一起显示在状态栏。

tooltip是当鼠标移动到tray上方时显示的提示语，在所有平台下都有效。

icon是tray显示在托盘中的图标。

menu是托盘中的菜单，是一个 gui.Menu对象（参考：node-webkit教程6native-ui-api-之menu菜单）。

alticon只有在mac下起作用，配置切换效果icon图标。

9.3 tray 的构造函数

new Tray(option)

option中用来初始化tray的属性值，但是只能配置title, tooltip, icon 和menu四个属性。如：

var tray = new gui.Tray({ title: 'Tray', icon: 'img/icon.png' });

所有的属性都可以通过对象直接获取或赋值，如：

tray.menu = menu;

9.4  初始化一个tray

现在我们修改tray.html：
<script>

var isShowWindow = true;

// Load native UI library

var gui = require('nw.gui');

var win = gui.Window.get();

var tray = new gui.Tray({ title: '玄魂的软件', icon: '2655716405282662783.png' });

tray.tooltip = '点此打开';

//添加一个菜单

var menu = new gui.Menu();

menu.append(new gui.MenuItem({ type: 'checkbox', label: '选择我' }));

tray.menu = menu;

//click事件

tray.on('click',

function()

{

if(isShowWindow)

{

win.hide();

isShowWindow = false;

}

else

{

win.show();

isShowWindow = true;

}

}

);

</script>

运行效果如下：

点击托盘中的图标程序的窗体会相应的隐藏或者显示。

9.5 删除tray

很可惜的是，现在还没有办法临时隐藏Tray，只能删除它。

在删除需要调用remove方法，然后设置为null。如：

tray.remove();

tray = null;

9.6 小结

本文内容主要参考node-webkit的官方英文文档，做了适当的调整（https://github.com/rogerwang/node-webkit/wiki/Tray）。

下一篇文章，介绍Tray。

鄙视不标明出处的转载，更多相关内容，欢迎访问玄魂的博客（www.xuanhun521.com）

更多相关内容，欢迎访问 玄魂的博客 ( 更多 node-webkit 相关内容 http://www.xuanhun521.com/Blog/Tag/node-webkit )

ps：nw.js，electron交流群 313717550

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