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.ui.Controls');
  11. goog.require('shaka.ui.Element');
  12. goog.require('shaka.ui.Locales');
  13. goog.require('shaka.ui.Utils');
  14. goog.require('shaka.util.Dom');
  17. /**
  18.  * @extends {shaka.ui.Element}
  19.  * @final
  20.  * @export
  21.  */
  22. shaka.ui.PresentationTimeTracker = class extends shaka.ui.Element {
  23.   /**
  24.    * @param {!HTMLElement} parent
  25.    * @param {!shaka.ui.Controls} controls
  26.    */
  27.   constructor(parent, controls) {
  28.     super(parent, controls);
  30.     /** @type {!HTMLButtonElement} */
  31.     this.currentTime_ = shaka.util.Dom.createButton();
  32.     this.currentTime_.classList.add('shaka-current-time');
  33.     this.setValue_('0:00');
  34.     this.parent.appendChild(this.currentTime_);
  36.     this.eventManager.listen(this.currentTime_, 'click', () => {
  37.       // Jump to LIVE if the user clicks on the current time.
  38.       if (this.player.isLive()) {
  39.         this.video.currentTime = this.player.seekRange().end;
  40.       }
  41.     });
  43.     this.eventManager.listen(this.controls, 'timeandseekrangeupdated', () => {
  44.       this.updateTime_();
  45.     });
  47.     this.eventManager.listen(this.player, 'trackschanged', () => {
  48.       this.onTracksChanged_();
  49.     });
  50.   }
  52.   /** @private */
  53.   setValue_(value) {
  54.     // To avoid constant updates to the DOM, which makes debugging more
  55.     // difficult, only set the value if it has changed.  If we don't do this
  56.     // check, the DOM updates constantly, this element flashes in the debugger
  57.     // in Chrome, and you can't make changes in the CSS panel.
  58.     if (value != this.currentTime_.textContent) {
  59.       this.currentTime_.textContent = value;
  60.     }
  61.   }
  63.   /** @private */
  64.   updateTime_() {
  65.     const isSeeking = this.controls.isSeeking();
  66.     let displayTime = this.controls.getDisplayTime();
  67.     const duration = this.video.duration;
  68.     const seekRange = this.player.seekRange();
  69.     const seekRangeSize = seekRange.end - seekRange.start;
  70.     const Utils = shaka.ui.Utils;
  72.     if (this.player.isLive()) {
  73.       // The amount of time we are behind the live edge.
  74.       const behindLive = Math.floor(seekRange.end - displayTime);
  75.       displayTime = Math.max(0, behindLive);
  77.       const showHour = seekRangeSize >= 3600;
  79.       // Consider "LIVE" when less than 1 second behind the live-edge.  Always
  80.       // show the full time string when seeking, including the leading '-';
  81.       // otherwise, the time string "flickers" near the live-edge.
  82.       // The button should only be clickable when it's live stream content, and
  83.       // the current play time is behind live edge.
  84.       if ((displayTime >= 1) || isSeeking) {
  85.         this.setValue_('- ' + Utils.buildTimeString(displayTime, showHour));
  86.         this.currentTime_.disabled = false;
  87.       } else {
  88.         this.setValue_(this.localization.resolve(shaka.ui.Locales.Ids.LIVE));
  89.         this.currentTime_.disabled = true;
  90.       }
  91.     } else {
  92.       const showHour = duration >= 3600;
  94.       let value = Utils.buildTimeString(displayTime, showHour);
  95.       if (duration) {
  96.         value += ' / ' + Utils.buildTimeString(duration, showHour);
  97.       }
  98.       this.setValue_(value);
  99.       this.currentTime_.disabled = true;
  100.     }
  101.   }
  103.   /**
  104.    * Set the aria label to be 'Live' when the content is live stream.
  105.    * @private
  106.    */
  107.   onTracksChanged_() {
  108.     if (this.player.isLive()) {
  109.       const ariaLabel = shaka.ui.Locales.Ids.SKIP_TO_LIVE;
  110.       this.currentTime_.ariaLabel = this.localization.resolve(ariaLabel);
  111.     }
  112.   }
  113. };
  116. /**
  117.  * @implements {shaka.extern.IUIElement.Factory}
  118.  * @final
  119.  */
  120. shaka.ui.PresentationTimeTracker.Factory = class {
  121.   /** @override */
  122.   create(rootElement, controls) {
  123.     return new shaka.ui.PresentationTimeTracker(rootElement, controls);
  124.   }
  125. };
  127. shaka.ui.Controls.registerElement(
  128.     'time_and_duration', new shaka.ui.PresentationTimeTracker.Factory());