private void ModelChildrenChanged()

in sources/Google.Solutions.Mvvm/Controls/BindableTreeView.cs [432:491]
48 lines of code
11 McCabe index (conditional complexity)

            private void ModelChildrenChanged(object sender, NotifyCollectionChangedEventArgs e)
            {
                switch (e.Action)
                {
                    case NotifyCollectionChangedAction.Add:
                        AddTreeNodesForModelNodes(e.NewItems.OfType<TModelNode>());
                        break;

                    case NotifyCollectionChangedAction.Remove:
                        foreach (var oldModelItem in e.OldItems.OfType<TModelNode>())
                        {
                            var oldTreeNode = FindTreeNodeByModelNode(oldModelItem);
                            if (oldTreeNode != null)
                            {
                                this.Nodes.Remove(oldTreeNode);
                                oldTreeNode.Dispose();
                            }
                        }

                        break;

                    case NotifyCollectionChangedAction.Replace:
                        if (e.OldItems.Count == e.NewItems.Count)
                        {
                            var count = e.OldItems.Count;
                            for (var i = 0; i < count; i++)
                            {
                                var oldModelItem = (TModelNode)e.OldItems[i];
                                var newModelItem = (TModelNode)e.NewItems[i];

                                var treeNode = FindTreeNodeByModelNode(oldModelItem);
                                if (treeNode != null)
                                {
                                    this.Nodes.Remove(treeNode);
                                    treeNode.Dispose();

                                    this.Nodes.Insert(
                                        e.NewStartingIndex,
                                        new Node(this.treeView, newModelItem));
                                }
                            }
                        }

                        break;

                    case NotifyCollectionChangedAction.Move:
                        // Not supported.
                        break;

                    case NotifyCollectionChangedAction.Reset:
                        // Reload everything.
                        DisposeAndClear(this.Nodes);

                        AddTreeNodesForModelNodes((ObservableCollection<TModelNode>)sender);
                        break;

                    default:
                        break;
                }
            }