private static void ConditionallyRegisterDependentInstance(INotifyPropertyChanged target)
{
if (instanceTable.TryGetValue(target, out _))
{
return;
}
lock (target)
{
if (instanceTable.TryGetValue(target, out _))
{
return;
}
instanceTable.Add(target, null);
}
Type dependentType = target.GetType();
if (!dependencyDefinitions.TryGetValue(dependentType, out var dependenciesByPropertyName))
{
return;
}
foreach (var dependency in dependenciesByPropertyName)
{
string targetPropertyName = dependency.Key;
foreach (JsonPath jsonpath in dependency.Value)
{
var dependencyNodes = ImmutableQueue.Create(jsonpath.Root.Nodes.ToArray());
INotifyPropertyChanged source = target;
source.ForwardPropertyChanged(dependencyNodes, target, targetPropertyName);
}
}
}
private static Action ForwardPropertyChanged(this INotifyPropertyChanged source, ImmutableQueue <JsonPathNode> dependencyNodes, INotifyPropertyChanged target, string targetPropertyName)
{
WeakReference <INotifyPropertyChanged> wr = new WeakReference <INotifyPropertyChanged>(target);
Action unsubscribe = null;
dependencyNodes = dependencyNodes.Dequeue(out var node);
switch (node)
{
case JsonPathPropertySelectorNode propertySelectorNode:
string sourcePropertyName = propertySelectorNode.PropertyName;
unsubscribe = source.ForwardPropertyChanged(sourcePropertyName, target, targetPropertyName);
if (dependencyNodes.IsEmpty)
{
return(unsubscribe);
}
Action unsubscribeNested = null;
if (propertySelectorNode.GetValue(source) is INotifyPropertyChanged nestedSource)
{
unsubscribeNested = nestedSource.ForwardPropertyChanged(dependencyNodes, target, targetPropertyName);
unsubscribe += unsubscribeNested;
}
unsubscribe += source.Bind <INotifyPropertyChanged, object>(sourcePropertyName, (value) =>
{
unsubscribe -= unsubscribeNested;
unsubscribeNested?.Invoke();
if (!wr.TryGetTarget(out var t))
{
return;
}
if (value is INotifyPropertyChanged nestedSrc)
{
unsubscribeNested = nestedSrc.ForwardPropertyChanged(dependencyNodes, t, targetPropertyName);
unsubscribe += unsubscribeNested;
}
});
