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YouTube Remaining Time

Show the remaining time of a YouTube video inside the player.

当前为 2016-04-25 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name         YouTube Remaining Time
  3. // @namespace    http://the6p4c.com/
  4. // @version      1.0
  5. // @description  Show the remaining time of a YouTube video inside the player.
  6. // @author       The6P4C
  7. // @match        *://www.youtube.com/*
  8. // @require      https://ajax.googleapis.com/ajax/libs/jquery/2.2.2/jquery.min.js
  9. // @grant        none
  10. // ==/UserScript==
  11.  
  12. var TIME_KEYS_ORDER = ["days", "hours", "minutes", "seconds"];
  13. var TIME_KEYS_ORDER_REV = [].concat(TIME_KEYS_ORDER).reverse();
  14.  
  15. function parseTime(timeString) {
  16.     // reversed so seconds first
  17.     var parts = timeString.split(":").reverse();
  18.     var time = {};
  19.  
  20.     for (var i = 0; i < TIME_KEYS_ORDER_REV.length; ++i) {
  21.         var key = TIME_KEYS_ORDER_REV[i];
  22.  
  23.         if (i < parts.length) {
  24.             time[key] = parseInt(parts[i]);
  25.         } else {
  26.             time[key] = 0;
  27.         }
  28.     }
  29.  
  30.     return time;
  31. }
  32.  
  33. function pad2(n) {
  34.     if (n >= 10) {
  35.         return n;
  36.     } else {
  37.         return "0" + n;
  38.     }
  39. }
  40.  
  41. function stringifyTime(time) {
  42.     var timeString = "";
  43.     var nonZeroEncountered = false;
  44.  
  45.     for (var i = 0; i < TIME_KEYS_ORDER.length; ++i) {
  46.         var key = TIME_KEYS_ORDER[i];
  47.         var currentValue = time[key];
  48.  
  49.         // Only start adding values from the first non zero
  50.         // But... always show minutes, even if they're zero.
  51.         if (currentValue !== 0 || nonZeroEncountered || key == "minutes") {
  52.             // We don't want to pad the first value:
  53.             // If there's hours, don't pad days
  54.             // If there's minutes, don't pad hours
  55.             // If there's seconds, don't pad minutes
  56.             if (nonZeroEncountered) {
  57.                 currentValue = pad2(currentValue);
  58.             }
  59.  
  60.             timeString += currentValue;
  61.  
  62.             if (key != "seconds") {
  63.                 timeString += ":";
  64.             }
  65.  
  66.             nonZeroEncountered = true;
  67.         }
  68.     }
  69.  
  70.     return timeString;
  71. }
  72.  
  73. function subtractTime(a, b) {
  74.     var secondsDiff = a.seconds - b.seconds;
  75.     var minutesDiff = a.minutes - b.minutes;
  76.     var hoursDiff = a.hours - b.hours;
  77.     var daysDiff = a.days - b.days;
  78.  
  79.     if (secondsDiff < 0) {
  80.         minutesDiff -= 1;
  81.         secondsDiff += 60;
  82.     }
  83.  
  84.     if (minutesDiff < 0) {
  85.         hoursDiff -= 1;
  86.         minutesDiff += 60;
  87.     }
  88.  
  89.     if (hoursDiff < 0) {
  90.         daysDiff -= 1;
  91.         hoursDiff += 24;
  92.     }
  93.  
  94.     return {
  95.         days: daysDiff,
  96.         hours: hoursDiff,
  97.         minutes: minutesDiff,
  98.         seconds: secondsDiff
  99.     };
  100. }
  101.  
  102. function onTimeChange() {
  103.     var $this = $(this);
  104.  
  105.     // If this event was called in the context of the .ytp-time-duration event,
  106.     // we need to set $timeCurrent not to $this but to the actual
  107.     // .ytp-time-current element.
  108.     var $timeCurrent = $this;
  109.     if (!$this.hasClass("ytp-time-current")) {
  110.         $timeCurrent = $this.parent().find(".ytp-time-current");
  111.     }
  112.  
  113.     var $timeDisplay = $timeCurrent.parent();
  114.     var $timeDuration = $timeDisplay.parent().find(".ytp-time-duration");
  115.  
  116.     if ($timeDisplay.attr("____remaining-added") != "____remaining-added") {
  117.         var $timeRemainingWrapper = $("<div style='display: inline-block; width: 5px;'></div><span style='color: #ddd; text-shadow: 0 0 2px rgba(0,0,0,.5)'>(-<span class='____time-remaining'></span>)</span>");
  118.         $timeDuration.after($timeRemainingWrapper);
  119.  
  120.         $timeDisplay.attr("____remaining-added", "____remaining-added");
  121.     }
  122.  
  123.     var $timeRemaining = $timeDisplay.find(".____time-remaining");
  124.  
  125.     var currentTime = parseTime($timeCurrent.text());
  126.     var durationTime = parseTime($timeDuration.text());
  127.     var remainingTime = subtractTime(durationTime, currentTime);
  128.  
  129.     $timeRemaining.text(stringifyTime(remainingTime));
  130. }
  131.  
  132. $(document).ready(function() {
  133.     $("body").on("DOMSubtreeModified", ".ytp-time-current", onTimeChange);
  134.     $("body").on("DOMSubtreeModified", ".ytp-time-duration", onTimeChange);
  135. });