private triggerOnFocusHandlers()

in src/focus.service.ts [257:291]

• 30 lines of code
• 12 McCabe index (conditional complexity)

  private triggerOnFocusHandlers(next: HTMLElement) {
    if (!this.root) {
      throw new Error('root not set');
    }
    const isAttached = this.selected !== null && this.root.contains(this.selected);
    if (!isAttached) {
      let elem: HTMLElement | null = next;
      while (elem !== null && elem !== this.root) {
        this.triggerFocusChange(elem, null);
        elem = elem.parentElement;
      }
      return;
    }

    // Find the common ancestor of the next and currently selected element.
    // Trigger focus changes on every element that we touch.
    const common = getCommonAncestor(next, this.selected);
    let el = this.selected;
    while (el !== common && el !== null) {
      this.triggerFocusChange(el, null);
      el = el.parentElement;
    }

    el = next;
    while (el !== common && el !== null) {
      this.triggerFocusChange(el, null);
      el = el.parentElement;
    }

    el = common;
    while (el !== this.root && el !== null) {
      this.triggerFocusChange(el, null);
      el = el.parentElement;
    }
  }