Source: ui/presentation_time.js

  1. /*! @license
  2.  * Shaka Player
  3.  * Copyright 2016 Google LLC
  4.  * SPDX-License-Identifier: Apache-2.0
  5.  */
  8. goog.provide('shaka.ui.PresentationTimeTracker');
  10. goog.require('shaka.ads.AdManager');
  11. goog.require('shaka.ui.Controls');
  12. goog.require('shaka.ui.Element');
  13. goog.require('shaka.ui.Locales');
  14. goog.require('shaka.ui.Utils');
  15. goog.require('shaka.util.Dom');
  18. /**
  19.  * @extends {shaka.ui.Element}
  20.  * @final
  21.  * @export
  22.  */
  23. shaka.ui.PresentationTimeTracker = class extends shaka.ui.Element {
  24.   /**
  25.    * @param {!HTMLElement} parent
  26.    * @param {!shaka.ui.Controls} controls
  27.    */
  28.   constructor(parent, controls) {
  29.     super(parent, controls);
  31.     /** @type {!HTMLButtonElement} */
  32.     this.currentTime_ = shaka.util.Dom.createButton();
  33.     this.currentTime_.classList.add('shaka-current-time');
  34.     this.setValue_('0:00');
  35.     this.parent.appendChild(this.currentTime_);
  37.     this.eventManager.listen(this.currentTime_, 'click', () => {
  38.       // Jump to LIVE if the user clicks on the current time.
  39.       if (this.player.isLive()) {
  40.         this.video.currentTime = this.player.seekRange().end;
  41.       }
  42.     });
  44.     this.eventManager.listen(this.player, 'loading', () => {
  45.       shaka.ui.Utils.setDisplay(this.currentTime_, true);
  46.     });
  48.     this.eventManager.listen(this.controls, 'timeandseekrangeupdated', () => {
  49.       this.updateTime_();
  50.     });
  52.     this.eventManager.listen(this.player, 'trackschanged', () => {
  53.       this.onTracksChanged_();
  54.     });
  56.     this.eventManager.listen(
  57.         this.adManager, shaka.ads.AdManager.AD_STARTED, () => {
  58.           shaka.ui.Utils.setDisplay(this.currentTime_, false);
  59.         });
  61.     this.eventManager.listen(
  62.         this.adManager, shaka.ads.AdManager.AD_STOPPED, () => {
  63.           shaka.ui.Utils.setDisplay(this.currentTime_, true);
  64.         });
  65.   }
  67.   /** @private */
  68.   setValue_(value) {
  69.     // To avoid constant updates to the DOM, which makes debugging more
  70.     // difficult, only set the value if it has changed.  If we don't do this
  71.     // check, the DOM updates constantly, this element flashes in the debugger
  72.     // in Chrome, and you can't make changes in the CSS panel.
  73.     if (value != this.currentTime_.textContent) {
  74.       this.currentTime_.textContent = value;
  75.     }
  76.   }
  78.   /** @private */
  79.   updateTime_() {
  80.     const isSeeking = this.controls.isSeeking();
  81.     let displayTime = this.controls.getDisplayTime();
  82.     const seekRange = this.player.seekRange();
  83.     const seekRangeSize = seekRange.end - seekRange.start;
  84.     const Utils = shaka.ui.Utils;
  86.     if (this.player.isLive()) {
  87.       // The amount of time we are behind the live edge.
  88.       const behindLive = Math.floor(seekRange.end - displayTime);
  89.       displayTime = Math.max(0, behindLive);
  91.       const showHour = seekRangeSize >= 3600;
  93.       // Consider "LIVE" when less than 1 second behind the live-edge.  Always
  94.       // show the full time string when seeking, including the leading '-';
  95.       // otherwise, the time string "flickers" near the live-edge.
  96.       // The button should only be clickable when it's live stream content, and
  97.       // the current play time is behind live edge.
  98.       if ((displayTime >= 1) || isSeeking) {
  99.         this.setValue_('- ' + Utils.buildTimeString(displayTime, showHour));
  100.         this.currentTime_.disabled = false;
  101.       } else {
  102.         this.setValue_(this.localization.resolve(shaka.ui.Locales.Ids.LIVE));
  103.         this.currentTime_.disabled = true;
  104.       }
  105.     } else {
  106.       const showHour = seekRangeSize >= 3600;
  108.       const currentTime = Math.max(0, displayTime - seekRange.start);
  109.       let value = Utils.buildTimeString(currentTime, showHour);
  110.       if (seekRangeSize) {
  111.         value += ' / ' + Utils.buildTimeString(seekRangeSize, showHour);
  112.       }
  113.       this.setValue_(value);
  114.       this.currentTime_.disabled = true;
  115.     }
  116.   }
  118.   /**
  119.    * Set the aria label to be 'Live' when the content is live stream.
  120.    * @private
  121.    */
  122.   onTracksChanged_() {
  123.     if (this.player.isLive()) {
  124.       const ariaLabel = shaka.ui.Locales.Ids.SKIP_TO_LIVE;
  125.       this.currentTime_.ariaLabel = this.localization.resolve(ariaLabel);
  126.     }
  127.   }
  128. };
  131. /**
  132.  * @implements {shaka.extern.IUIElement.Factory}
  133.  * @final
  134.  */
  135. shaka.ui.PresentationTimeTracker.Factory = class {
  136.   /** @override */
  137.   create(rootElement, controls) {
  138.     return new shaka.ui.PresentationTimeTracker(rootElement, controls);
  139.   }
  140. };
  142. shaka.ui.Controls.registerElement(
  143.     'time_and_duration', new shaka.ui.PresentationTimeTracker.Factory());