private void AttachingCore(DomObject instance)
{
if (!(instance is DomContainer))
{
return;
}
var doc = (instance is DomDocument dd) ? dd : instance.OwnerDocument;
// Special case: monitor the document node to add it to the document element
// if the document element is later added
DomObserver docElement = null;
if (instance is DomDocument document)
{
docElement = doc.ObserveChildNodes((DomNode)instance, AddNamespaceToDocumentElement, DomScope.Target);
if (document.DocumentElement != null)
{
document.DocumentElement.NameContext = new XmlNameContext();
}
}
_observer = DomObserver.Compose(
doc.ObserveAttributes((DomNode)instance, FixupNamespace, DomScope.TargetAndDescendants),
docElement
);
}
public ElementsByAttributeIndex(DomDocument owner, DomName name, Func <string, TKey> func, IEqualityComparer <TKey> comparer) : base(comparer)
{
_attributeName = name;
_func = func;
_observer = DomObserver.Compose(
owner.ObserveAttributes(name, Handler),
owner.ObserveChildNodes(Handler)
);
foreach (var desc in owner.DescendantsAndSelf)
{
Add(desc.Attribute(_attributeName), desc);
}
}
public DomObserver ObserveChildNodes(DomNode target, Action <DomMutationEvent> handler, DomScope scope)
{
if (target is null)
{
throw new ArgumentNullException(nameof(target));
}
if (handler is null)
{
throw new ArgumentNullException(nameof(handler));
}
var result = DomObserver.ChildNodes(handler);
_observers.RegisterObserver(
result, target, scope, DomObserverEventScope.ChildNodes
);
return(result);
}
public DomObserver ObserveAttributes(DomNode target, DomName attribute, Action <DomAttributeEvent> handler, DomScope scope)
{
if (target is null)
{
throw new ArgumentNullException(nameof(target));
}
if (attribute is null)
{
throw new ArgumentNullException(nameof(attribute));
}
if (handler is null)
{
throw new ArgumentNullException(nameof(handler));
}
var result = DomObserver.Attributes(handler);
_observers.RegisterObserver(
result, target, scope, DomObserverEventScope.AnyAttribute
);
return(result);
}
public void RegisterObserver(DomObserver observer, DomNode target, DomScope scope, DomObserverEventScope events)
{
var list = GetItemsForScope(events);
list.Add(new ScopedDomObserverTarget(observer, target, scope));
}
public ScopedDomObserverTarget(DomObserver observer, DomNode target, DomScope scope) : base(observer)
{
Target = target;
Scope = scope;
}
