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