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 ExpandInternal()
{
if (IsInATreeListView && ListView.InvokeRequired)
{
throw new Exception("Invoke Required");
}
TreeListViewItem treeListViewItem = null;
if (TreeListView != null)
{
treeListViewItem = TreeListView.FocusedItem;
}
CheckDirection checkDirection = CheckDirection.All;
if (ListView != null)
{
checkDirection = ListView.CheckDirection;
ListView.CheckDirection = CheckDirection.None;
}
if (Visible && !_IsExpanded && ListView != null)
{
TreeListViewCancelEventArgs treeListViewCancelEventArgs = new TreeListViewCancelEventArgs(this, TreeListViewAction.Expand);
ListView.RaiseBeforeExpand(treeListViewCancelEventArgs);
if (treeListViewCancelEventArgs.Cancel)
{
return;
}
}
if (Visible)
{
for (int num = Items.Count - 1; num >= 0; num--)
{
TreeListViewItem treeListViewItem2 = Items[num];
if (!treeListViewItem2.Visible)
{
ListView treeListView = TreeListView;
treeListView.Items.Insert(base.Index + 1, treeListViewItem2);
treeListViewItem2.SetIndentation();
}
if (treeListViewItem2.IsExpanded)
{
treeListViewItem2.Expand();
}
}
}
if (Visible && !_IsExpanded && IsInATreeListView)
{
_IsExpanded = true;
TreeListViewEventArgs e = new TreeListViewEventArgs(this, TreeListViewAction.Expand);
ListView.RaiseAfterExpand(e);
if (this.AfterExpand != null)
{
this.AfterExpand(this);
}
}
_IsExpanded = true;
if (IsInATreeListView)
{
ListView.CheckDirection = checkDirection;
}
if (TreeListView != null && treeListViewItem != null && treeListViewItem.Visible)
{
treeListViewItem.Focused = true;
}
}
