private void Init()
{
_children = new List<SimpleGroup>();
_buildingElementTypes = new List<SimpleBuildingElementType>();
IEnumerable<IfcRelAssignsToGroup> rels = _model.Instances.Where<IfcRelAssignsToGroup>(r => r.RelatingGroup == _group).ToList();
if (rels.FirstOrDefault() == null)
{
using (XbimReadWriteTransaction trans = _model.BeginTransaction("Group relation creation"))
{
var rel = _model.Instances.New<IfcRelAssignsToGroup>(r => r.RelatingGroup = _group);
trans.Commit();
(rel as INotifyPropertyChanged).PropertyChanged += new PropertyChangedEventHandler(RelationChanged);
(rel.RelatedObjects as INotifyCollectionChanged).CollectionChanged -= new NotifyCollectionChangedEventHandler(ElementCollectionChanged);
(rel.RelatedObjects as INotifyCollectionChanged).CollectionChanged += new NotifyCollectionChangedEventHandler(ElementCollectionChanged);
}
}
else
{
foreach (var rel in rels)
{
(rel as INotifyPropertyChanged).PropertyChanged += new PropertyChangedEventHandler(RelationChanged);
(rel.RelatedObjects as INotifyCollectionChanged).CollectionChanged -= new NotifyCollectionChangedEventHandler(ElementCollectionChanged);
(rel.RelatedObjects as INotifyCollectionChanged).CollectionChanged += new NotifyCollectionChangedEventHandler(ElementCollectionChanged);
IEnumerable<IfcGroup> groups = rel.RelatedObjects.OfType<IfcGroup>();
foreach (IfcGroup group in groups)
{
SimpleGroup child = new SimpleGroup(group, this);
child.PropertyChanged += new PropertyChangedEventHandler(ChildChanged);
_children.Add(child);
}
IEnumerable<IfcTypeProduct> types = rel.RelatedObjects.OfType<IfcTypeProduct>();
foreach (var type in types)
{
SimpleBuildingElementType simpleType = new SimpleBuildingElementType(type);
simpleType.PropertyChanged -= new PropertyChangedEventHandler(TypeChanged);
simpleType.PropertyChanged += new PropertyChangedEventHandler(TypeChanged);
_buildingElementTypes.Add(simpleType);
}
}
}
}
void ElementCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
switch (e.Action)
{
case NotifyCollectionChangedAction.Add:
foreach (var item in e.NewItems)
{
IfcTypeProduct type = item as IfcTypeProduct;
if (type == null) continue;
//find existing in the structure
SimpleBuildingElementType simpleType = GetTypeFromHierarchy(type);
//if it does not exist than create new one
if (simpleType == null)
simpleType = new SimpleBuildingElementType(type);
_buildingElementTypes.Add(simpleType);
}
break;
case NotifyCollectionChangedAction.Remove:
foreach (var item in e.OldItems)
{
IfcTypeProduct type = item as IfcTypeProduct;
if (type == null) continue;
SimpleBuildingElementType simpleType = _buildingElementTypes.Where(st => st.IfcType == type).FirstOrDefault();
if (simpleType != null) _buildingElementTypes.Remove(simpleType);
}
break;
case NotifyCollectionChangedAction.Replace:
throw new NotSupportedException();
case NotifyCollectionChangedAction.Reset:
Init();
break;
default:
break;
}
}
