/// <summary>
/// Reparents the given elements
/// </summary>
/// <param name="parentElement"></param>
/// <param name="insertionIndex"></param>
/// <param name="elements"></param>
public void MoveElements(TreeElement parentElement, int insertionIndex, params 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);
TreeElement.UpdateDepthValues(root);
TreeElement.TreeToList(this.root, this.data);
OnChanged();
}
/// <summary>
/// Removes the given elements
/// </summary>
/// <param name="elements"></param>
public void RemoveElements(IList <T> elements)
{
foreach (var element in elements)
{
if (element == this.root)
{
throw new ArgumentException("It is not allowed to remove the root element");
}
}
var commonAncestors = TreeElement.FindCommonAncestorsWithinList(elements);
foreach (var element in commonAncestors)
{
element.parent.children.Remove(element);
element.parent = null;
}
TreeElement.TreeToList(this.root, this.data);
OnChanged();
}
/// <summary>
/// Reparents the given elements
/// </summary>
/// <param name="parent"></param>
/// <param name="insertionIndex"></param>
/// <param name="children"></param>
public static void Parent(TreeElement parent, params TreeElement[] children)
{
// Invalid reparenting input
if (parent == null)
{
return;
}
// Remove draggedItems from their parents
foreach (var child in children)
{
Parent(parent, child);
UpdateDepthValues(child);
}
if (parent.children == null)
{
parent.children = new List <TreeElement>();
}
// Insert dragged items under new parent
parent.children.AddRange(children);
}
//------------------------------------------------------------------------/
// Methods: Private
//------------------------------------------------------------------------/
private IList <int> GetParentsBelowStackBased(TreeElement searchFromThis)
{
Stack <TreeElement> stack = new Stack <TreeElement>();
stack.Push(searchFromThis);
var parentsBelow = new List <int>();
while (stack.Count > 0)
{
TreeElement current = stack.Pop();
if (current.hasChildren)
{
parentsBelow.Add(current.id);
foreach (var T in current.children)
{
stack.Push(T);
}
}
}
return(parentsBelow);
}
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
TreeElement.Assert(listOfElements);
}
/// <summary>
/// Adds an element onto the tree
/// </summary>
/// <param name="element"></param>
/// <param name="parent"></param>
/// <param name="insertPosition"></param>
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;
TreeElement.UpdateDepthValues(parent);
TreeElement.TreeToList(this.root, this.data);
OnChanged();
}
/// <summary>
/// Returns the root of the tree parsed from the list (always the first element)
/// Note: The first element is requried to have a depth value of -1, with the rest
/// of the elements at a depth >= 0
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="list"></param>
/// <returns></returns>
public static T ListToTree <T>(IList <T> list) where T : TreeElement
{
// Validate input
TreeElement.Assert(list);
// Clear old state
foreach (var element in list)
{
element.parent = null;
element.children = null;
}
// Set child and parent references using depth info
for (int parentIndex = 0; parentIndex < list.Count; parentIndex++)
{
T parent = list[parentIndex];
// Been visited before
bool alreadyHasValidChildren = parent.children != null;
if (alreadyHasValidChildren)
{
continue;
}
// Count children based depth value, lookign at children until its
// the same depth of this element
int parentDepth = parent.depth;
int childCount = 0;
for (int i = parentIndex + 1; i < list.Count; i++)
{
int depth = list[i].depth;
if (depth == parentDepth + 1)
{
childCount++;
}
else if (depth <= parentDepth)
{
break;
}
}
// Fill the child array for this element
List <TreeElement> children = null;
if (childCount != 0)
{
children = new List <TreeElement>(childCount);
childCount = 0;
for (int i = parentIndex + 1; i < list.Count; i++)
{
int depth = list[i].depth;
if (depth == parentDepth + 1)
{
list[i].parent = parent;
children.Add(list[i]);
childCount++;
}
if (depth <= parentDepth)
{
break;
}
}
}
parent.children = children;
}
// Now return the root
return(list[0]);
}
private void Parse()
{
_root = TreeElement.ListToTree(this.elements);
}
/// <summary>
/// Reparents the given elements
/// </summary>
/// <param name="parentElement"></param>
/// <param name="insertionIndex"></param>
/// <param name="elements"></param>
public void Reparent(TreeElement parentElement, List <TreeElement> elements)
{
TreeElement.Parent(parentElement, elements.ToArray());
}
/// <summary>
/// Reparents the given elements
/// </summary>
/// <param name="parentElement"></param>
/// <param name="insertionIndex"></param>
/// <param name="elements"></param>
public void Reparent(TreeElement parentElement, params TreeElement[] elements)
{
TreeElement.Parent(parentElement, elements);
}
public Exception Validate()
{
Exception exception = TreeElement.Validate(this.elements);
return(exception);
}
//------------------------------------------------------------------------/
// Methods: Public
//------------------------------------------------------------------------/
public void Assert()
{
TreeElement.Assert(this.elements);
}
/// <summary>
/// Reparents the given elements
/// </summary>
/// <param name="parentElement"></param>
/// <param name="insertionIndex"></param>
/// <param name="elements"></param>
public void MoveElements(TreeElement parentElement, int insertionIndex, List <TreeElement> elements)
{
MoveElements(parentElement, insertionIndex, elements.ToArray());
}