public virtual int Add(TreeListViewItem item)
{
if (TreeListView != null && TreeListView.InvokeRequired)
{
throw new Exception("Invoke required");
}
if (TreeListView != null && item.ListView != null)
{
throw new Exception("The Item is already in a TreeListView");
}
int insertCollectionIndex = GetInsertCollectionIndex(item);
if (insertCollectionIndex == -1)
{
return(-1);
}
if (Parent != null)
{
item.SetParent(Parent);
}
item.Items.Comparer = Comparer;
int insertTreeListViewIndex = GetInsertTreeListViewIndex(item, insertCollectionIndex);
if (insertTreeListViewIndex > -1)
{
ListView treeListView = TreeListView;
treeListView.Items.Insert(insertTreeListViewIndex, item);
if (item.IsExpanded)
{
item.Expand();
}
item.SetIndentation();
}
if (insertCollectionIndex > -1)
{
base.List.Insert(insertCollectionIndex, item);
}
if (insertCollectionIndex > -1)
{
OnItemAdded(new TreeListViewEventArgs(item, TreeListViewAction.Unknown));
}
if (base.Count == 1 && TreeListView != null && Parent != null && Parent.Visible)
{
Parent.Redraw();
}
return(insertCollectionIndex);
}
internal void RemoveAtInternal(int index)
{
if (TreeListView != null && TreeListView.InvokeRequired)
{
throw new Exception("Invoke required");
}
TreeListViewItem treeListViewItem = this[index];
if (this[index].Visible && TreeListView != null)
{
treeListViewItem.Hide();
}
base.List.RemoveAt(index);
treeListViewItem.SetParent(null);
if (base.Count == 0 && TreeListView != null && Parent != null)
{
Parent.Redraw();
}
if (base.Count > 0 && TreeListView != null && index == base.Count)
{
this[index - 1].Redraw();
}
OnItemRemoved(new TreeListViewEventArgs(treeListViewItem, TreeListViewAction.Unknown));
}
