TreeNode

Remarks

A model object, not an element. A tree of a hundred thousand nodes has a hundred thousand of these and perhaps thirty rows on screen; making the node an element would put a style slot, a layout node and a draw command behind every one of them, which is exactly what doc 09 makes virtualisation a first-class primitive to avoid.

⚠ HasChildren is a claim, not a count. A node that has not been populated still has to draw a chevron — the project browser cannot enumerate a folder to find out whether it is worth showing one — so "might have children" and "has children loaded" are two different questions, and only the first is answerable cheaply.

Fields and properties (10)

• public string? Text

  What it says.

• public object? Tag

  Whatever the application hung off it.

• public PathBuilder? Icon

  The glyph drawn between the chevron and the text, or null for none.

• public IconArt? Art

  Several paths in colours of their own, drawn instead of Icon.

• public TreeNode? Parent

  The node this is under, or null for a root.

• public IReadOnlyList<TreeNode> Children

  Its children, in order.

• public bool IsExpanded

  Whether its children are showing.

• public bool HasChildren

  Whether it may have children, whether or not any have been loaded.

• public Action<TreeNode>? Populate

  What to run the first time it is expanded, if its children are loaded on demand.

• public int Depth

  How deep it is. A root is zero.

Methods (6)

• public TreeNode(string? text = null, object? tag = null)

  Creates a node.

• public TreeNode Add(TreeNode child, int index = -1)

  Adds a child.

• public TreeNode Add(string? text, object? tag = null)

  Adds a child with some text.

• public int IndexOf(TreeNode child)

  Where a child sits among the others, or -1 if it is not one.

• public bool Remove(TreeNode child)

  Takes a child out.

• public bool Contains(TreeNode node)

  Whether a node is this one or somewhere under it.

Used by (24)

• ShellHelloUi
• ResizeTestsVixen.Ui.Controls.Advanced.Tests
• TreeRowVixen.Ui.Controls.Advanced
• TreeViewVixen.Ui.Controls.Advanced
• TreeViewTestsVixen.Ui.Controls.Advanced.Tests
• AddressableGroupsViewVixen.Editor.AssetEditors
• ChromeFixtureVixen.Editor.Ui.Tests
• EditorAffordanceTestsVixen.Editor.App.Tests
• EditorApplicationVixen.Editor.App
• EditorSessionVixen.Editor.Testing
• FrameDebuggerViewVixen.Editor.Debugger
• GridViewTestsVixen.Editor.App.Tests
• IconContributionTestsVixen.Editor.App.Tests
• ImportViewTestsVixen.Editor.AssetEditors.Tests
• InputActionsViewVixen.Editor.AssetEditors
• InspectorPanelTestsVixen.Editor.App.Tests
• ModelImportViewVixen.Editor.AssetEditors
• OutlinerColumnTestsVixen.Editor.App.Tests
• OutlinerTestsVixen.Editor.App.Tests
• PanelBehaviourTestsVixen.Editor.App.Tests
• ProjectBrowserVixen.Editor.App
• RemoteInspectorViewVixen.Editor.Debugger
• SceneHierarchyViewVixen.Editor.AssetEditors
• SelectionTestsVixen.Editor.App.Tests