framework/js/forum/src/ForumApp.js

import History from 'flarum/utils/History';
import App from 'flarum/App';
import Search from 'flarum/components/Search';
import Composer from 'flarum/components/Composer';
import ReplyComposer from 'flarum/components/ReplyComposer';
import DiscussionPage from 'flarum/components/DiscussionPage';

export default class ForumApp extends App {
  constructor(...args) {
    super(...args);

    /**
     * The app's history stack, which keeps track of which routes the user visits
     * so that they can easily navigate back to the previous route.
     *
     * @type {History}
     */
    this.history = new History();

    /**
     * An object which controls the state of the page's side pane.
     *
     * @type {Pane}
     */
    this.pane = null;

    /**
     * The page's search component instance.
     *
     * @type {SearchBox}
     */
    this.search = new Search();

    /**
     * An object which controls the state of the page's drawer.
     *
     * @type {Drawer}
     */
    this.drawer = null;

    /**
     * A map of post types to their components.
     *
     * @type {Object}
     */
    this.postComponents = {};

    /**
     * A map of activity types to their components.
     *
     * @type {Object}
     */
    this.activityComponents = {};

    /**
     * A map of notification types to their components.
     *
     * @type {Object}
     */
    this.notificationComponents = {};
  }

  /**
   * Check whether or not the user is currently composing a reply to a
   * discussion.
   *
   * @param {Discussion} discussion
   * @return {Boolean}
   */
  composingReplyTo(discussion) {
    return this.composer.component instanceof ReplyComposer &&
      this.composer.component.props.discussion === discussion &&
      this.composer.position !== Composer.PositionEnum.HIDDEN;
  }

  /**
   * Check whether or not the user is currently viewing a discussion.
   *
   * @param {Discussion} discussion
   * @return {Boolean}
   */
  viewingDiscussion(discussion) {
    return this.current instanceof DiscussionPage &&
      this.current.discussion === discussion;
  }
}