public virtual int Add(TreeListViewItem item)
{
if (TreeListView != null)
{
if (TreeListView.InvokeRequired)
{
throw (new Exception("Invoke required"));
}
}
// Do not add the item if the collection owns a TreeListView recursively
// and the item already owns a TreeListView
if (TreeListView != null && item.ListView != null)
{
throw new Exception("The Item is already in a TreeListView");
}
int index = GetInsertCollectionIndex(item);
if (index == -1)
{
return(-1);
}
if (Parent != null)
{
item.SetParent(Parent);
}
item.Items.Comparer = this.Comparer;
int treeListViewIndex = GetInsertTreeListViewIndex(item, index);
// Insert in the ListView
if (treeListViewIndex > -1)
{
ListView listview = (ListView)TreeListView;
listview.Items.Insert(treeListViewIndex, (ListViewItem)item);
if (item.IsExpanded)
{
item.Expand();
}
item.SetIndentation();
}
// Insert in this collection
if (index > -1)
{
List.Insert(index, item);
}
if (index > -1)
{
OnItemAdded(new TreeListViewEventArgs(item, TreeListViewAction.Unknown));
}
if (Count == 1 && TreeListView != null && Parent != null)
{
if (Parent.Visible)
{
Parent.Redraw();
}
}
return(index);
}
internal void ExpandInternal()
{
if (IsInATreeListView)
{
if (ListView.InvokeRequired)
{
throw new Exception("Invoke Required");
}
}
TreeListViewItem selItem = null;
if (TreeListView != null)
{
selItem = TreeListView.FocusedItem;
}
// Must set ListView.checkDirection to CheckDirection.None.
// Forbid recursively checking.
CheckDirection oldDirection = CheckDirection.All;
if (ListView != null)
{
oldDirection = this.ListView.CheckDirection;
ListView.CheckDirection = CheckDirection.None;
}
// The item wasn't expanded -> raise an event
if (Visible && !_IsExpanded && ListView != null)
{
TreeListViewCancelEventArgs e = new TreeListViewCancelEventArgs(this, TreeListViewAction.Expand);
ListView.RaiseBeforeExpand(e);
if (e.Cancel)
{
return;
}
}
if (Visible)
{
for (int i = Items.Count - 1; i >= 0; i--)
{
TreeListViewItem item = this.Items[i];
if (!item.Visible)
{
ListView listView = this.ListView;
listView.Items.Insert(this.Index + 1, item);
item.SetIndentation();
}
if (item.IsExpanded)
{
item.Expand();
}
}
}
// The item wasn't expanded -> raise an event
if (Visible && !_IsExpanded && IsInATreeListView)
{
this._IsExpanded = true;
TreeListViewEventArgs e = new TreeListViewEventArgs(this, TreeListViewAction.Expand);
ListView.RaiseAfterExpand(e);
if (AfterExpand != null)
{
AfterExpand(this);
}
}
this._IsExpanded = true;
// Reset ListView.checkDirection
if (IsInATreeListView)
{
ListView.CheckDirection = oldDirection;
}
if (TreeListView != null && selItem != null)
{
if (selItem.Visible)
{
selItem.Focused = true;
}
}
}