public void MoveElements(TreeElement parentElement, int insertionIndex, List <TreeElement> 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 (var 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 <TreeElement>();
}
// Insert dragged items under new parent
parentElement.children.InsertRange(insertionIndex, elements);
TreeElementUtility.UpdateDepthValues(root);
TreeElementUtility.TreeToList(m_Root, m_Data);
Changed();
}
public void RemoveElements(IList <T> elements)
{
foreach (var element in elements)
{
if (element == m_Root)
{
throw new ArgumentException("It is not allowed to remove the root element");
}
}
var commonAncestors = TreeElementUtility.FindCommonAncestorsWithinList(elements);
foreach (var element in commonAncestors)
{
element.parent.children.Remove(element);
element.parent = null;
}
TreeElementUtility.TreeToList(m_Root, m_Data);
Changed();
}
public static void TestTreeModelCanRemoveElements()
{
var root = new TreeElement {
name = "Root", depth = -1
};
var listOfElements = new List <TreeElement>();
listOfElements.Add(root);
var model = new TreeModel <TreeElement>(listOfElements);
model.AddElement(new TreeElement {
name = "Element"
}, root, 0);
model.AddElement(new TreeElement {
name = "Element " + root.children.Count
}, root, 0);
model.AddElement(new TreeElement {
name = "Element " + root.children.Count
}, root, 0);
model.AddElement(new TreeElement {
name = "Sub Element"
}, root.children[1], 0);
model.RemoveElements(new[] { root.children[1].children[0], root.children[1] });
// Assert order is correct
string[] namesInCorrectOrder = { "Root", "Element 2", "Element" };
Assert.AreEqual(namesInCorrectOrder.Length, listOfElements.Count, "Result count does not match");
for (int i = 0; i < namesInCorrectOrder.Length; ++i)
{
Assert.AreEqual(namesInCorrectOrder[i], listOfElements[i].name);
}
// Assert depths are valid
TreeElementUtility.ValidateDepthValues(listOfElements);
}
public void AddElement(T element, TreeElement parent, int insertPosition)
{
if (element == null)
{
throw new ArgumentNullException("element", "element is null");
}
if (parent == null)
{
throw new ArgumentNullException("parent", "parent is null");
}
if (parent.children == null)
{
parent.children = new List <TreeElement> ();
}
parent.children.Insert(insertPosition, element);
element.parent = parent;
TreeElementUtility.UpdateDepthValues(parent);
TreeElementUtility.TreeToList(m_Root, m_Data);
Changed();
}