Source: ui/rewind_button.js

  1. /*! @license
  2.  * Shaka Player
  3.  * Copyright 2016 Google LLC
  4.  * SPDX-License-Identifier: Apache-2.0
  5.  */
  8. goog.provide('shaka.ui.RewindButton');
  10. goog.require('shaka.ui.Controls');
  11. goog.require('shaka.ui.Element');
  12. goog.require('shaka.ui.Enums');
  13. goog.require('shaka.ui.Locales');
  14. goog.require('shaka.ui.Localization');
  15. goog.require('shaka.util.Dom');
  18. /**
  19.  * @extends {shaka.ui.Element}
  20.  * @final
  21.  * @export
  22.  */
  23. shaka.ui.RewindButton = 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.     /** @private {!HTMLButtonElement} */
  32.     this.button_ = shaka.util.Dom.createButton();
  33.     this.button_.classList.add('material-icons-round');
  34.     this.button_.classList.add('shaka-rewind-button');
  35.     this.button_.classList.add('shaka-tooltip-status');
  36.     this.button_.setAttribute('shaka-status',
  37.         this.localization.resolve(shaka.ui.Locales.Ids.OFF));
  38.     this.button_.textContent =
  39.       shaka.ui.Enums.MaterialDesignIcons.REWIND;
  40.     this.parent.appendChild(this.button_);
  41.     this.updateAriaLabel_();
  43.     /** @private {!Array<number>} */
  44.     this.rewindRates_ = this.controls.getConfig().rewindRates;
  46.     this.eventManager.listen(
  47.         this.localization, shaka.ui.Localization.LOCALE_UPDATED, () => {
  48.           this.updateAriaLabel_();
  49.         });
  51.     this.eventManager.listen(
  52.         this.localization, shaka.ui.Localization.LOCALE_CHANGED, () => {
  53.           this.updateAriaLabel_();
  54.         });
  56.     this.eventManager.listen(this.button_, 'click', () => {
  57.       if (!this.controls.isOpaque()) {
  58.         return;
  59.       }
  60.       this.rewind_();
  61.     });
  62.   }
  64.   /**
  65.    * @private
  66.    */
  67.   updateAriaLabel_() {
  68.     this.button_.ariaLabel =
  69.         this.localization.resolve(shaka.ui.Locales.Ids.REWIND);
  70.   }
  72.   /**
  73.    * Cycles trick play rate between the selected rewind rates.
  74.    * @private
  75.    */
  76.   rewind_() {
  77.     if (!this.video.duration) {
  78.       return;
  79.     }
  81.     const trickPlayRate = this.player.getPlaybackRate();
  82.     const newRateIndex = this.rewindRates_.indexOf(trickPlayRate) + 1;
  84.     // When the button is clicked, the next rate in this.rewindRates_ is
  85.     // selected. If no more rates are available, the first one is set.
  86.     const newRate = (newRateIndex != this.rewindRates_.length) ?
  87.         this.rewindRates_[newRateIndex] : this.rewindRates_[0];
  89.     if (this.video.paused) {
  90.       // Our fast forward is implemented with playbackRate and needs the video
  91.       // to be playing (to not be paused) to take immediate effect.
  92.       // If the video is paused, "unpause" it.
  93.       this.video.play();
  94.     }
  95.     this.player.trickPlay(newRate);
  97.     this.button_.setAttribute('shaka-status', newRate + 'x');
  98.   }
  99. };
  102. /**
  103.  * @implements {shaka.extern.IUIElement.Factory}
  104.  * @final
  105.  */
  106. shaka.ui.RewindButton.Factory = class {
  107.   /** @override */
  108.   create(rootElement, controls) {
  109.     return new shaka.ui.RewindButton(rootElement, controls);
  110.   }
  111. };
  113. shaka.ui.Controls.registerElement(
  114.     'rewind', new shaka.ui.RewindButton.Factory());