function setActiveDescendant()

in src/focus-zone.ts [378:402]

21 lines of code
8 McCabe index (conditional complexity)


  function setActiveDescendant(from: HTMLElement | undefined, to: HTMLElement, directlyActivated = false) {
    if (!to.id) {
      to.setAttribute('id', uniqueId())
    }

    if (from && from !== to) {
      from.removeAttribute(isActiveDescendantAttribute)
    }

    if (
      !activeDescendantControl ||
      (!directlyActivated && activeDescendantControl.getAttribute('aria-activedescendant') === to.id)
    ) {
      // prevent active descendant callback from being called repeatedly if the same element is activated (e.g. via mousemove)
      return
    }

    activeDescendantControl.setAttribute('aria-activedescendant', to.id)
    container.setAttribute(hasActiveDescendantAttribute, to.id)
    to.setAttribute(
      isActiveDescendantAttribute,
      directlyActivated ? activeDescendantActivatedDirectly : activeDescendantActivatedIndirectly
    )
    activeDescendantCallback?.(to, from, directlyActivated)
  }