source property

@override set source (PopupSource? source)

Sets the source the popup should be created relative to.

Implementation

@override
set source(PopupSource? source) {
  if (source != null) {
    super.source = source;

    // Set the popup ID on the source for ARIA attributes.
    source.popupId = uniqueId;

    // This component supports direct control over the [PopupRef] by way
    // of the Toggle library. Here, we register the [PopupRef] as a
    // [Toggleable] iff [source] uses the library.
    if (source is Toggler) {
      (source as Toggler).toggleable = _DeferredToggleable(this);
    }
  }
}