UnityEditor.AudioMixerGroupSelector.InitTreeView C# (CSharp) Method

        private void InitTreeView(Rect rect)
        {
            TreeViewDataSourceForMixers mixers;
            this.m_TreeViewState = new TreeViewState();
            this.m_TreeView = new TreeView(base.editorWindow, this.m_TreeViewState);
            GroupTreeViewGUI gui = new GroupTreeViewGUI(this.m_TreeView);
            mixers = new TreeViewDataSourceForMixers(this.m_TreeView, this.m_IgnoreThisController) {
                onVisibleRowsChanged = (System.Action) Delegate.Combine(mixers.onVisibleRowsChanged, new System.Action(gui.CalculateRowRects)),
                onVisibleRowsChanged = (System.Action) Delegate.Combine(mixers.onVisibleRowsChanged, new System.Action(this.ResizeWindow))
            };
            this.m_TreeView.deselectOnUnhandledMouseDown = true;
            this.m_TreeView.Init(rect, mixers, gui, null);
            this.m_TreeView.ReloadData();
            this.m_TreeView.selectionChangedCallback = new Action<int[]>(this.OnItemSelectionChanged);
            this.m_TreeView.itemDoubleClickedCallback = new Action<int>(this.OnItemDoubleClicked);
            int[] selectedIDs = new int[] { (this.m_OriginalSelection == null) ? 0 : this.m_OriginalSelection.GetInstanceID() };
            this.m_TreeView.SetSelection(selectedIDs, true);
        }