protected virtual void UpdateNodes(IDictionary <string, IValue> update)
{
if (update == null || !update.ContainsKey("nodes"))
{
return;
}
var nodes = update["nodes"].GetList();
foreach (var node in nodes)
{
var nodeDictionary = node.GetDictionary();
if (nodeDictionary == null)
{
continue;
}
int nodeId = nodeDictionary["id"].GetInt();
var accessibilityNode = GetNode(nodeId);
// Create if it is a new one
if (accessibilityNode != null)
{
accessibilityNode.Update(nodeDictionary);
}
else
{
accessibilityNode = new AccessibilityNode((FrameworkElement)Owner, nodeDictionary, this);
accessibilityNodeMap[nodeId] = accessibilityNode;
}
}
}
protected virtual void RemoveNode(AccessibilityNode node)
{
if (node == null)
{
return;
}
foreach (var child in node.GetChildAccessibilityNodes())
{
RemoveNode(child);
}
accessibilityNodeMap.Remove(node.Id);
}
protected virtual void UpdateLayout(IDictionary <string, IValue> eventDictionary, List <IDictionary <string, IValue> > updateDictionaries)
{
foreach (var updateDictionary in updateDictionaries)
{
bool rootNodeChanged = false;
// If a node is to be cleared
if (updateDictionary.ContainsKey("node_id_to_clear"))
{
// Reset root node if that is to be cleared
int nodeIdToClear = updateDictionary["node_id_to_clear"].GetInt();
if (nodeIdToClear == RootNodeId)
{
RootNodeId = -1;
}
AccessibilityNode node = GetNode(nodeIdToClear);
RemoveNode(node);
}
if (updateDictionary.ContainsKey("root_id"))
{
int newRootNodeId = updateDictionary["root_id"].GetInt();
if (newRootNodeId != RootNodeId)
{
RootNodeId = newRootNodeId;
rootNodeChanged = true;
}
}
UpdateNodes(updateDictionary);
if (rootNodeChanged)
{
RaiseAutomationEvent(AutomationEvents.StructureChanged);
}
}
}
