lib/amd/src/fullscreen.js

  1. // This file is part of Moodle - http://moodle.org/
  2. //
  3. // Moodle is free software: you can redistribute it and/or modify
  4. // it under the terms of the GNU General Public License as published by
  5. // the Free Software Foundation, either version 3 of the License, or
  6. // (at your option) any later version.
  7. //
  8. // Moodle is distributed in the hope that it will be useful,
  9. // but WITHOUT ANY WARRANTY; without even the implied warranty of
  10. // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11. // GNU General Public License for more details.
  12. //
  13. // You should have received a copy of the GNU General Public License
  14. // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16. /**
  17.  * Detects if an element is fullscreen.
  18.  *
  19.  * @module     core/fullscreen
  20.  * @copyright  2020 University of Nottingham
  21.  * @author     Neill Magill <neill.magill@nottingham.ac.uk>
  22.  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23.  */
  25. /**
  26.  * Gets the element that is fullscreen or null if no element is fullscreen.
  27.  *
  28.  * @method
  29.  * @returns {HTMLElement}
  30.  */
  31. export const getElement = () => {
  32.     let element = null;
  33.     if (document.fullscreenElement) {
  34.         element = document.fullscreenElement;
  35.     } else if (document.mozFullscreenElement) {
  36.         // Fallback for older Firefox.
  37.         element = document.mozFullscreenElement;
  38.     } else if (document.msFullscreenElement) {
  39.         // Fallback for Edge and IE.
  40.         element = document.msFullscreenElement;
  41.     } else if (document.webkitFullscreenElement) {
  42.         // Fallback for Chrome, Edge and Safari.
  43.         element = document.webkitFullscreenElement;
  44.     }
  46.     return element;
  47. };