clr-angular-static-fix/utils/focus-trap/focus-trap-tracker.service.ts

1. Install Clarity Icons package through npm:

/*
 * Copyright (c) 2016-2018 VMware, Inc. All Rights Reserved.
 * This software is released under MIT license.
 * The full license information can be found in LICENSE in the root directory of this project.
 */
import { Injectable } from '@angular/core';
import { FocusTrapDirective } from './focus-trap.directive';

@Injectable()
export class FocusTrapTracker {
  private _previousFocusTraps: FocusTrapDirective[] = [];
  private _current: FocusTrapDirective;

  get current(): FocusTrapDirective {
    return this._current;
  }

  set current(value: FocusTrapDirective) {
    this._previousFocusTraps.push(this._current);
    this._current = value;
  }

  activatePreviousTrapper() {
    this._current = this._previousFocusTraps.pop();
  }
}