dispose method

@override void dispose()

Called when this object is removed from the tree permanently.

Implementation

@override
void dispose() {
  if (Zone.current[#isMeasuringIntrinsics] == true) {
    super.dispose();
    return;
  }
  if (widget.focusNode == null) {
    _focusNode.dispose();
  } else if (_attachedParent != null &&
      _focusNode.parent == _attachedParent) {
    _attachedParent!.removeChild(_focusNode);
  } else if (_focusNode.hasFocus) {
    _focusNode.unfocus();
  }
  _attachedParent = null;
  super.dispose();
}