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FunctionZero.TreeListItemsSourceZero

The purpose of this package is to allow a ListView-type-control to behave like a TreeView and display hierarchical data. This is particularly useful if you want to adapt a GridView to behave like a TreeView, like this:

Sample Project

UWP sample project
You can also take a look at the unit tests for usage examples

Basic Usage

Your nodes must expose some way of getting their children, though the mechanism for that is entirely up to you. For example, given a tree of the following nodes:

public class MyNode
{
    public ObservableCollection<MyNode> Children{ get; }
    // Make it yours ...
}

You simply wrap your root node like this:

bool isTreeRootShown = true;        // We want the root node to be visible in our tree
var rootNode = GetRootNode();       // Get your tree data from somewhere

var rootContainer = new TreeItemSourceManager<MyNode>(isTreeRootShown, rootNode, (node) => node.Children);

The lambda function takes an instance of MyNode and must return an IEnumerable<MyNode> containing that node's children. If the IEnumerable is an ObservableCollection, the library will track changes to the underlying data.

rootContainer is now a wrapper around your rootNode and it exposes:

public ReadOnlyObservableCollection<TreeNodeContainer<T>> TreeNodeChildren { get; }

You can then bind your ListView ItemsSource to this property, write a suitable ItemTemplate, and your ListView is now a TreeView!

At a minimum, your DataTemplate will want to use the following properties on each TreeNodeContainer:

// Bind a checkbox to this to expand or collapse a node
bool IsExpanded;

// Represents the nest level of the current TreeNodeContainer
int Indent;

// This is the node that the container wraps, so represent it as you see fit
MyNode Data;

Child nodes are not enumerated until their parent container is expanded. TreeItemSourceManager provides a NodeChanged event if you want to manage virtualisation or other custom behaviour.