setState method
Implementation
@protected
void setState(ButtonState value) {
  if (_state == value) {
    return;
  }
  _state = value;
  _updateSkin();
  updateLabel();
  onChangeState?.call(_state);
}@protected
void setState(ButtonState value) {
  if (_state == value) {
    return;
  }
  _state = value;
  _updateSkin();
  updateLabel();
  onChangeState?.call(_state);
}