/// <inheritdoc/>
public override bool CanAttach(INodePresenter nodePresenter)
{
// We are in a dictionary...
var dictionaryDescriptor = nodePresenter.Descriptor as DictionaryDescriptor;
if (dictionaryDescriptor == null)
{
return(false);
}
// ... that is not read-only...
var memberCollection = (nodePresenter as MemberNodePresenter)?.MemberAttributes.OfType <MemberCollectionAttribute>().FirstOrDefault()
?? nodePresenter.Descriptor.Attributes.OfType <MemberCollectionAttribute>().FirstOrDefault();
if (memberCollection?.ReadOnly == true)
{
return(false);
}
// ... can construct key type...
if (!AddNewItemCommand.CanConstruct(dictionaryDescriptor.KeyType))
{
return(false);
}
// ... and can construct value type
var elementType = dictionaryDescriptor.ValueType;
return(AddNewItemCommand.CanAdd(elementType));
}
/// <inheritdoc/>
public override bool CanAttach(INodePresenter nodePresenter)
{
// We are in a collection or dictionary...
var collectionNode = (nodePresenter as ItemNodePresenter)?.OwnerCollection;
var collectionDescriptor = collectionNode?.Descriptor as CollectionDescriptor;
var dictionaryDescriptor = collectionNode?.Descriptor as DictionaryDescriptor;
if (collectionDescriptor == null && dictionaryDescriptor == null)
{
return(false);
}
// ... that is not read-only...
var memberCollection = (collectionNode as MemberNodePresenter)?.MemberAttributes.OfType <MemberCollectionAttribute>().FirstOrDefault()
?? collectionNode.Descriptor.Attributes.OfType <MemberCollectionAttribute>().FirstOrDefault();
if (memberCollection?.ReadOnly == true)
{
return(false);
}
// ... and supports remove...
if (collectionDescriptor != null)
{
var elementType = collectionDescriptor.ElementType;
// We also add the same conditions that for AddNewItem
return(collectionDescriptor.HasRemoveAt && AddNewItemCommand.CanAdd(elementType));
}
// TODO: add a HasRemove in the dictionary descriptor and test it!
return(true);
}
