protected virtual void RebuildPopertyNodesImpl()
{
DestroyPropertyNodes();
object[] instances = Instances == null ? EmptyArray <object> .Instance
: Instances.Cast <object>().ToArray();
// TODO: cache and reuse PropertyNodes where possible to prevent having to
// rebuild all of the data templates
IEnumerable <PropertyDescriptor> descriptors = null;
if (CustomPropertyDescriptors != null)
{
descriptors = CustomPropertyDescriptors;
}
else if (Instances != null)
{
descriptors = PropertyUtils.GetSharedPropertiesOriginal(instances);
}
PropertyNode headerPropertyNode = null;
var propertyNodes = new ObservableCollection <PropertyNode>();
if (descriptors != null)
{
var context = TransactionContext.As <ITransactionContext>();
if (context == null)
{
context = DataContext.As <ITransactionContext>();
}
foreach (var descriptor in descriptors)
{
if (descriptor.IsBrowsable)
{
PropertyNode node;
if (PropertyFactory != null)
{
node = PropertyFactory.CreateProperty(instances, descriptor, true, context);
}
else
{
node = new PropertyNode();
node.Initialize(instances, descriptor, true);
}
node.ValueSet += node_ValueSet;
node.ValueError += node_ValueError;
if (node.Category != null)
{
bool expansionState;
if (m_categoryExpanded.TryGetValue(node.Category, out expansionState))
{
node.IsExpanded = expansionState;
}
}
if (headerPropertyNode == null && descriptor.Attributes[typeof(HeaderPropertyAttribute)] != null)
{
headerPropertyNode = node;
}
else
{
propertyNodes.Add(node);
}
}
}
}
// Listen for expansion state changes so that we can persist through different objects.
m_listener = ChangeListener.Create(propertyNodes, "IsExpanded");
m_listener.PropertyChanged += ChildExpandedPropertyChanged;
Properties = propertyNodes;
HeaderProperty = headerPropertyNode;
}
