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Basalt2/docs/references/elements/Tree.md
2025-03-18 00:52:20 +00:00

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# Tree : VisualElement
This is the tree class. It provides a hierarchical view of nodes that can be expanded and collapsed,
with support for selection and scrolling.
## Properties
|Property|Type|Default|Description|
|---|---|---|---|
|nodes|table|{}|The tree structure containing node objects with {text, children} properties
|selectedNode|table?|nil|Currently selected node
|expandedNodes|table|{}|Table of nodes that are currently expanded
|scrollOffset|number|0|Current vertical scroll position
|horizontalOffset|number|0|Current horizontal scroll position
|nodeColor|color|white|Color of unselected nodes
|selectedColor|color|lightBlue|Background color of selected node
## Functions
|Method|Returns|Description|
|---|---|---|
|[Tree:collapseNode](#tree-collapsenode)|Tree|Collapses a node to hide its children
|[Tree:expandNode](#tree-expandnode)|Tree|Expands a node to show its children
|[Tree:getNodeSize](#tree-getnodesize)|number|Gets the size of the tree
|[Tree:onSelect](#tree-onselect)|Tree|Registers a callback for when a node is selected
|[Tree:toggleNode](#tree-togglenode)|Tree|Toggles between expanded and collapsed state
## Protected Functions
|Method|Returns|Description|
|---|---|---|
|Tree:init|Tree|Initializes the Tree instance
|Tree:mouse_click|boolean|Handles mouse click events for node selection and expansion
|Tree:mouse_scroll|boolean|Handles mouse scroll events for vertical scrolling
|Tree:render|-|Renders the tree with nodes, selection and scrolling
## Tree:collapseNode(node)
Collapses a node
### Parameters
* `node` `table` The node to collapse
### Returns
* `Tree` `self` The Tree instance
## Tree:expandNode(node)
Expands a node
### Parameters
* `node` `table` The node to expand
### Returns
* `Tree` `self` The Tree instance
## Tree:getNodeSize()
Gets the size of the tree
### Returns
* `number` `width` The width of the tree
* `number` `height` The height of the tree
## Tree:onSelect(callback)
Registers a callback for when a node is selected
### Parameters
* `callback` `function` The callback function
### Returns
* `Tree` `self` The Tree instance
## Tree:toggleNode(node)
Toggles a node's expanded state
### Parameters
* `node` `table` The node to toggle
### Returns
* `Tree` `self` The Tree instance