deserialize method

Implementation

@override
void deserialize(XmlElement xml)
{

  // deserialize
  super.deserialize(xml);

  // checkboxes can have multiple values
  var values = Xml.getChildElements(node: xml, tag: 'value');
  if (values != null) {
    for (var element in values) {
    String? v = Xml.getText(element);
    if (!S.isNullOrEmpty(v))
    {
      if (_value == null) {
        value = v;
      } else if (!_value!.contains(v)) {
        _value!.add(v);
      }
    }
  }
  }

  /// layout attributes
  layout = Xml.get(node: xml, tag: 'layout');
  center = Xml.get(node: xml, tag: 'center');
  wrap = Xml.get(node: xml, tag: 'wrap');

  /// styling attributes
  size  = Xml.get(node: xml, tag: 'size');

  // clear options
  for (var option in this.options) {
    option.dispose();
  }
  this.options.clear();

  // Build options
  List<OptionModel> options = findChildrenOfExactType(OptionModel).cast<OptionModel>();

  // set prototype
  if ((!S.isNullOrEmpty(datasource)) && (options.isNotEmpty))
  {
    prototype = WidgetModel.prototypeOf(options[0].element);
    options.removeAt(0);
  }

  // build options
  for (var option in options) {
    this.options.add(option);
  }
}