deserialize method

Implementation

@override
void deserialize(XmlElement xml) {
  // deserialize
  super.deserialize(xml);

  // set properties
  value = Xml.get(node: xml, tag: 'value');

  // automatically add an empty widget to the list?
  var addempty = toBool(Xml.get(node: xml, tag: 'addempty'));
  if (addempty == null && emptyOption != null) addempty = true;
  this.addempty = addempty ?? true;

  // build select options
  _buildOptions();

  // set the default selected option
  if (datasource == null) _setSelectedOption();
}