List <Progress.Item> GetSiblingItems(Progress.Item item, out int newParentId)
{
newParentId = item.parentId;
if (item.parentId == -1)
{
var rootIds = m_TreeView.GetRootIds();
return(rootIds?.Select(id => m_TreeView.GetItemDataForId <Progress.Item>(id)).ToList());
}
if (!m_ContainedItems.Contains(newParentId))
{
// If the parent is missing, the item should be put at the root level for now.
List <int> itemIds;
if (!m_MissingParents.TryGetValue(item.parentId, out itemIds))
{
itemIds = new List <int>();
m_MissingParents.Add(item.parentId, itemIds);
}
itemIds.Add(item.id);
newParentId = -1;
return(m_TreeView.GetRootIds()?.Select(id => m_TreeView.GetItemDataForId <Progress.Item>(id)).ToList());
}
var childrenIds = m_TreeView.viewController.GetChildrenIds(newParentId);
return(childrenIds?.Select(id => m_TreeView.GetItemDataForId <Progress.Item>(id)).ToList());
}