#### [PromptPlus](PromptPlus.md 'PromptPlus') ### [PromptPlusLibrary](PromptPlusLibrary.md 'PromptPlusLibrary') ## ITreeNode\ Interface Represents a node of the tree exposed by the [ITreeSelectControl<T>](ITreeSelectControl_T_.md 'PromptPlusLibrary\.ITreeSelectControl\') when it is being constructed\. A node carries a user value and can have any number of children added lazily through [AddLast\(T, bool\)](ITreeNode_T_.md#PromptPlusLibrary.ITreeNode_T_.AddLast(T,bool) 'PromptPlusLibrary\.ITreeNode\\.AddLast\(T, bool\)') and [AddFirst\(T, bool\)](ITreeNode_T_.md#PromptPlusLibrary.ITreeNode_T_.AddFirst(T,bool) 'PromptPlusLibrary\.ITreeNode\\.AddFirst\(T, bool\)')\. ```csharp public interface ITreeNode ``` #### Type parameters `T` The user item type held by the node\. Derived ↳ [ITreeMultiSelectNode<T>](ITreeMultiSelectNode_T_.md 'PromptPlusLibrary\.ITreeMultiSelectNode\') ### Properties ## ITreeNode\\.Disabled Property Whether this node can be confirmed\. Disabled nodes are still shown and can still be navigated to and expanded/collapsed; only confirming them \(`Enter`\) is blocked, and view\-only mode ignores this entirely, same as `PredicateSelected`\. ```csharp bool Disabled { get; } ``` #### Property Value [System\.Boolean](https://learn.microsoft.com/en-us/dotnet/api/system.boolean 'System\.Boolean') ## ITreeNode\\.Parent Property The parent node, or `null` when this node is the root of the tree\. ```csharp PromptPlusLibrary.ITreeNode? Parent { get; } ``` #### Property Value [PromptPlusLibrary\.ITreeNode<](ITreeNode_T_.md 'PromptPlusLibrary\.ITreeNode\')[T](ITreeNode_T_.md#PromptPlusLibrary.ITreeNode_T_.T 'PromptPlusLibrary\.ITreeNode\\.T')[>](ITreeNode_T_.md 'PromptPlusLibrary\.ITreeNode\') ## ITreeNode\\.Value Property The user value associated with this node\. ```csharp T Value { get; } ``` #### Property Value [T](ITreeNode_T_.md#PromptPlusLibrary.ITreeNode_T_.T 'PromptPlusLibrary\.ITreeNode\\.T') ### Methods ## ITreeNode\\.AddFirst\(T, bool\) Method Inserts a child at the beginning of this node's children collection\. ```csharp PromptPlusLibrary.ITreeNode AddFirst(T value, bool disable=false); ``` #### Parameters `value` [T](ITreeNode_T_.md#PromptPlusLibrary.ITreeNode_T_.T 'PromptPlusLibrary\.ITreeNode\\.T') The value of the new child\. Cannot be `null`\. `disable` [System\.Boolean](https://learn.microsoft.com/en-us/dotnet/api/system.boolean 'System\.Boolean') When `true`, the new child cannot be confirmed\. Default is `false`\. #### Returns [PromptPlusLibrary\.ITreeNode<](ITreeNode_T_.md 'PromptPlusLibrary\.ITreeNode\')[T](ITreeNode_T_.md#PromptPlusLibrary.ITreeNode_T_.T 'PromptPlusLibrary\.ITreeNode\\.T')[>](ITreeNode_T_.md 'PromptPlusLibrary\.ITreeNode\') The newly created child node\. ## ITreeNode\\.AddLast\(T, bool\) Method Appends a child at the end of this node's children collection\. ```csharp PromptPlusLibrary.ITreeNode AddLast(T value, bool disable=false); ``` #### Parameters `value` [T](ITreeNode_T_.md#PromptPlusLibrary.ITreeNode_T_.T 'PromptPlusLibrary\.ITreeNode\\.T') The value of the new child\. Cannot be `null`\. `disable` [System\.Boolean](https://learn.microsoft.com/en-us/dotnet/api/system.boolean 'System\.Boolean') When `true`, the new child cannot be confirmed\. Default is `false`\. #### Returns [PromptPlusLibrary\.ITreeNode<](ITreeNode_T_.md 'PromptPlusLibrary\.ITreeNode\')[T](ITreeNode_T_.md#PromptPlusLibrary.ITreeNode_T_.T 'PromptPlusLibrary\.ITreeNode\\.T')[>](ITreeNode_T_.md 'PromptPlusLibrary\.ITreeNode\') The newly created child node\.