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YouTube - Button Container (@require)

Creates a button container, under the video, onto which buttons can be added

当前为 2015-04-05 提交的版本，查看 最新版本。

此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.cn-greasyfork.org/scripts/9004/44603/YouTube%20-%20Button%20Container%20%28%40require%29.js 

  1. // ==UserScript==
  2. // @name          YouTube - Button Container (@require)
  3. // @namespace     https://greasyfork.org/en/users/10166-moriarty
  4. // @description   Creates a button container, under the video, onto which buttons can be added
  5. // @include       http://*.youtube.com/*
  6. // @include       http://youtube.com/*
  7. // @include       https://*.youtube.com/*
  8. // @include       https://youtube.com/*
  9. // @copyright     CodeFelony
  10. // @author        Moriarty
  11. // @version       1.0.0
  12. // @license       LGPL version 3 or any later version; http://www.gnu.org/copyleft/lgpl.html
  13. // @grant         GM_addStyle
  14. // ==/UserScript==
  15.  
  16. var addButtonToContainer = (function () {
  17.     'use strict';
  18.  
  19.     var rYoutubeWhitelistedUrls = /^https?:\/\/([^\.]+\.)?youtube\.com\/(watch|user\/|channel\/)/;
  20.  
  21.     var TEST_MODE = false; // if true, will replace the current style with this one
  22.  
  23.     // helper functions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  24.     function addStyle(contents) {
  25.         var head = document.head || query('html > head'),
  26.             style = document.createElement('style');
  27.  
  28.         style.id = 'underMovieDivStyle';
  29.         style.type = 'text/css';
  30.         style.appendChild( document.createTextNode(contents) );
  31.  
  32.         if (head) {
  33.             head.appendChild(style);
  34.         }
  35.     }
  36.     function id(name) {
  37.         return document.getElementById(name);
  38.     }
  39.     function query(name) {
  40.         return document.querySelector(name);
  41.     }
  42.     // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  43.  
  44.     function waitForHeadReady() {
  45.         if ( document.head || query('html > head') ) {
  46.             window.setTimeout(handleStyleCreation, TEST_MODE === true ? 3000 : 0);
  47.         } else {
  48.             window.setTimeout(waitForHeadReady, 200);
  49.         }
  50.     }
  51.  
  52.     function handleStyleCreation() {
  53.         var umdv = id('underMovieDivStyle'),
  54.             obs = new MutationObserver(function (mutations) {
  55.                 mutations.forEach(function (mutation) {
  56.                     if (mutation.target.id === 'underMovieDivStyle') {
  57.                         handleStyleCreation();
  58.                     }
  59.                 });
  60.             });
  61.  
  62.         if (TEST_MODE === true || !umdv) {
  63.             if (umdv) {
  64.                 umdv.parentNode.removeChild(umdv);
  65.             }
  66.  
  67.             addStyle('' +
  68.                 '#under-movie-div { ' +
  69.                     'background: transparent !important; ' +
  70.                     'display: block; ' +
  71.                     'padding-top: 4px; ' +
  72.                     'padding-bottom: 8px; ' +
  73.                     'text-align: left; ' +
  74.                     'z-index: 999999; ' +
  75.                 '}\n\n' +
  76.                 '.under-movie-div-button { ' +
  77.                     'background-image: linear-gradient(to top, #F6F6F6 0px, #FCFCFC 100%) !important; ' +
  78.                     'border: 1px solid #CCCCCC; ' +
  79.                     'border-radius: 2px; ' +
  80.                     'color: #666666 !important; ' +
  81.                     'font-size: 12px !important; ' +
  82.                     'font-family: arial, sans-serif !important; ' +
  83.                     'font-weight: 400 !important; ' +
  84.                     'height: auto !important; ' +
  85.                     'line-height: 20px !important; ' +
  86.                     'margin-right: 6px; ' +
  87.                     'padding: 2px 10px !important; ' +
  88.                 '}\n\n' +
  89.                 // - - - - - - - - - - - - - - - - - - -
  90.                 '#watch7-headline { ' +
  91.                     'padding: 4px 0 !important; ' +
  92.                 '}\n\n' +
  93.                 '#watch7-headline h1 { ' +
  94.                     'text-align: center; ' +
  95.                     'width: 100%; ' +
  96.                 '}\n\n' +
  97.                 '#upsell-video { ' +
  98.                     'overflow: visible !important; ' + // allow the button container to show on non-video pages
  99.                 '}' +
  100.             '');
  101.  
  102.             // observe the style for changes if test mode enabled
  103.             if (TEST_MODE === true) {
  104.                 obs.observe(id('underMovieDivStyle'), {
  105.                     childList : true,
  106.                     attributes : true,
  107.                     characterData : true
  108.                 });
  109.             }
  110.         }
  111.     }
  112.  
  113.     function handleContainerCreation() {
  114.         var holder = query('#watch7-headline, #gh-overviewtab div.c4-spotlight-module-component'),
  115.             container = id('under-movie-div');
  116.  
  117.         if (container == null) {
  118.             container = document.createElement('div');
  119.             container.id = 'under-movie-div';
  120.  
  121.             if (holder) {
  122.                 holder.appendChild(container);
  123.             }
  124.         }
  125.  
  126.         return container;
  127.     }
  128.  
  129.     function add(text, onclick, ID) {
  130.         var upsellVideo = id('upsell-video'),
  131.             container = handleContainerCreation(),
  132.             button = document.createElement('button'),
  133.             span = document.createElement('span');
  134.             ID = ID || text.replace(/[^a-zA-Z0-9-_]/, '');
  135.  
  136.         if ( !location.href.match(rYoutubeWhitelistedUrls) || id(ID) ) { return; }
  137.         if (typeof text !== 'string' || typeof onclick !== 'function') { return; }
  138.  
  139.         span.setAttribute('class', 'yt-uix-button-content');
  140.         span.appendChild( document.createTextNode(text) );
  141.  
  142.         button.id = ID;
  143.         button.addEventListener('click', function () {
  144.             window.setTimeout(onclick, 0);
  145.         }, false);
  146.  
  147.         button.type = 'button';
  148.         button.setAttribute('class', 'under-movie-div-button yt-uix-button yt-uix-button-text yt-uix-tooltip');
  149.         button.appendChild(span);
  150.  
  151.         return container.appendChild(button);
  152.     }
  153.  
  154.     waitForHeadReady();
  155.  
  156.     return add;
  157. }());
  158.  
  159. /* EXAMPLE BUTTON
  160.     addButtonToContainer('A Test Button', function () { alert('Test.'); }, 'test-button');
  161. */