mercury_editor-2.0.x-dev/build/js/ajax-progress.js

(function () {
  'use strict';

  /**
   * Sets the fullscreen progress indicator.
   */
  Drupal.Ajax.prototype.setProgressIndicatorMercuryeditor = function () {
    const el = Drupal.theme('mercuryAjaxSpinner');
    document.body.append(el);
    this.progress.element = el;
  };

  Drupal.theme.mercuryAjaxSpinner = function () {
    const el = document.createElement('div');
    el.classList.add('me-ajax-progress');
    el.innerHTML = '<div class="spinner"></div>';
    if (window.frameElement) {
      if (window.frameElement.closest('mercury-dialog')) {
        const main = window.frameElement.closest('mercury-dialog').shadowRoot.querySelector('main');
        const offsetX = main.scrollLeft;
        const offsetY = main.scrollTop;
        const {width, height} = main.getBoundingClientRect();
        const spinner = el.querySelector('.spinner');
        spinner.style.left = offsetX + (width/2) + 'px';
        spinner.style.top = offsetY + (height/2) + 'px';
      }
    }
    return el;
  };

})();