public static void RegisterClassHandler(Type classType, RoutedEvent routedEvent, Delegate handler, bool handledEventsToo)
{
List <ClassHandlerNode> rootNodes;
if (!_classHandlers.TryGetValue(routedEvent, out rootNodes))
{
_classHandlers.Add(routedEvent, rootNodes = new List <ClassHandlerNode>());
}
RoutedEventHandlerInfo handlerInfo = new RoutedEventHandlerInfo(handler, handledEventsToo);
foreach (ClassHandlerNode node in rootNodes)
{
ClassHandlerNode resultNode = PlaceInNode(node, classType, handlerInfo);
if (resultNode == null)
{
continue;
}
if (resultNode != node)
{
rootNodes.Remove(node);
rootNodes.Add(resultNode);
}
return;
}
ClassHandlerNode newNode = new ClassHandlerNode()
{
Class = classType,
Handler = handlerInfo,
};
rootNodes.Add(newNode);
}
private static ClassHandlerNode PlaceInNode(ClassHandlerNode node, Type classType, RoutedEventHandlerInfo handler)
{
// If classes are the same, replace existing handler
Type nodeType = node.Class.GetType();
if (nodeType == classType)
{
node.Handler = handler;
return(node);
}
// If new class is a subclass of the node, insert it
if (classType.IsSubclassOf(nodeType))
{
foreach (ClassHandlerNode subNode in node.SubClassHandlers)
{
ClassHandlerNode resultNode = PlaceInNode(subNode, classType, handler);
if (resultNode == null)
{
continue;
}
if (resultNode != subNode)
{
node.SubClassHandlers.Remove(subNode);
node.SubClassHandlers.Add(resultNode);
}
return(node);
}
// No interior place found to insert node
ClassHandlerNode newNode = new ClassHandlerNode()
{
Class = classType,
Handler = handler,
};
node.SubClassHandlers.Add(newNode);
return(node);
}
// If the new node is a super of the node, rearrange
if (nodeType.IsSubclassOf(classType))
{
ClassHandlerNode newNode = new ClassHandlerNode()
{
Class = classType,
Handler = handler,
};
newNode.SubClassHandlers.Add(node);
return(newNode);
}
return(null);
}