didUpdateWidget method

@override void didUpdateWidget(covariant DropdownButton<T> oldWidget)

Called whenever the widget configuration changes.

Implementation

@override
void didUpdateWidget(DropdownButton<T> oldWidget) {
  super.didUpdateWidget(oldWidget);
  if (widget.focused != oldWidget.focused) {
    if (widget.focused) {
      _focusNode.requestFocus();
    } else {
      _focusNode.unfocus();
    }
  }
}