public void MoveElements(T parentElement, int insertionIndex, List <T> elements)
{
if (insertionIndex < 0)
{
throw new ArgumentException("Invalid input: insertionIndex is -1, client needs to decide what index elements should be reparented at");
}
// Invalid reparenting input
if (parentElement == null)
{
return;
}
// We are moving items so we adjust the insertion index to accomodate that any items above the insertion index is removed before inserting
if (insertionIndex > 0)
{
insertionIndex -= parentElement.Children.GetRange(0, insertionIndex).Count(elements.Contains);
}
// Remove draggedItems from their parents
foreach (T draggedItem in elements)
{
draggedItem.Parent.Children.Remove(draggedItem); // remove from old parent
draggedItem.Parent = parentElement; // set new parent
}
if (parentElement.Children == null)
{
parentElement.Children = new List <T>();
}
// Insert dragged items under new parent
parentElement.Children.InsertRange(insertionIndex, elements);
TreeElementUtility.UpdateDepthValues(Root);
TreeElementUtility.TreeToList(root, data);
Changed();
}
public void RemoveElements(IList <T> elements)
{
foreach (T element in elements)
{
if (element.Equals(root))
{
throw new ArgumentException("It is not allowed to remove the root element");
}
}
IList <T> commonAncestors = TreeElementUtility.FindCommonAncestorsWithinList(elements);
foreach (T element in commonAncestors)
{
element.Parent.Children.Remove(element);
element.Parent = default;
}
TreeElementUtility.TreeToList(root, data);
Changed();
}