private void Update(object newValue, NodeIndex index, bool sendNotification)
{
if (index == NodeIndex.Empty)
{
throw new ArgumentException("index cannot be empty.");
}
var oldValue = Retrieve(index);
ItemChangeEventArgs itemArgs = null;
if (sendNotification)
{
itemArgs = new ItemChangeEventArgs(this, index, ContentChangeType.CollectionUpdate, oldValue, newValue);
NotifyItemChanging(itemArgs);
}
var collectionDescriptor = Descriptor as CollectionDescriptor;
var dictionaryDescriptor = Descriptor as DictionaryDescriptor;
if (collectionDescriptor != null)
{
collectionDescriptor.SetValue(Value, index.Int, ConvertValue(newValue, collectionDescriptor.ElementType));
}
else if (dictionaryDescriptor != null)
{
dictionaryDescriptor.SetValue(Value, index.Value, ConvertValue(newValue, dictionaryDescriptor.ValueType));
}
else
{
throw new NotSupportedException("Unable to set the node value, the collection is unsupported");
}
UpdateReferences();
if (sendNotification)
{
NotifyItemChanged(itemArgs);
}
}
private void OnItemChanged(object sender, ItemChangeEventArgs e)
{
ItemChanged?.Invoke(sender, e);
}
protected void NotifyItemChanged(ItemChangeEventArgs args)
{
ItemChanged?.Invoke(this, args);
FinalizeChange?.Invoke(this, args);
}
protected void NotifyItemChanging(ItemChangeEventArgs args)
{
PrepareChange?.Invoke(this, args);
ItemChanging?.Invoke(this, args);
}
