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; } } }