public virtual int Add(TreeNode node)
{
if (node == null)
{
throw new ArgumentNullException("node");
}
int index;
TreeView tree_view = null;
if (owner != null)
{
tree_view = owner.TreeView;
}
if (tree_view != null && UsingSorting)
{
index = AddSorted(node);
}
else
{
if (count >= nodes.Length)
{
Grow();
}
index = count;
count++;
nodes[index] = node;
}
SetupNode(node);
#if NET_2_0
// UIA Framework Event: Collection Changed
if (tree_view != null)
{
tree_view.OnUIACollectionChanged(owner, new CollectionChangeEventArgs(CollectionChangeAction.Add, node));
}
#endif
return(index);
}
// UIA Framework Event: Collection Changed
private void OnUIACollectionChanged(CollectionChangeAction action, TreeNode node)
{
TreeView?.OnUIACollectionChanged(owner, new CollectionChangeEventArgs(action, node));
}
private void RemoveAt(int index, bool update)
{
TreeNode removed = nodes [index];
TreeNode prev = GetPrevNode(removed);
TreeNode new_selected = null;
bool re_set_selected = false;
bool visible = removed.IsVisible;
TreeView tree_view = null;
if (owner != null)
{
tree_view = owner.TreeView;
}
if (tree_view != null)
{
tree_view.RecalculateVisibleOrder(prev);
if (removed == tree_view.SelectedNode)
{
if (removed.IsExpanded)
{
removed.Collapse(); // Fix Xamarin Bugzilla 5010.
}
re_set_selected = true;
OpenTreeNodeEnumerator oe = new OpenTreeNodeEnumerator(removed);
if (oe.MoveNext() && oe.MoveNext())
{
new_selected = oe.CurrentNode;
}
else
{
oe = new OpenTreeNodeEnumerator(removed);
oe.MovePrevious();
new_selected = oe.CurrentNode == removed ? null : oe.CurrentNode;
}
}
}
Array.Copy(nodes, index + 1, nodes, index, count - index - 1);
count--;
nodes[count] = null;
if (nodes.Length > OrigSize && nodes.Length > (count * 2))
{
Shrink();
}
if (tree_view != null && re_set_selected)
{
tree_view.SelectedNode = new_selected;
}
TreeNode parent = removed.parent;
removed.parent = null;
if (update && tree_view != null && visible)
{
tree_view.RecalculateVisibleOrder(prev);
tree_view.UpdateScrollBars(false);
tree_view.UpdateBelow(parent);
}
// UIA Framework Event: Collection Changed
if (tree_view != null)
{
tree_view.OnUIACollectionChanged(owner, new CollectionChangeEventArgs(CollectionChangeAction.Remove, removed));
}
}