Struct Tree 

pub struct Tree<T> { /* private fields */ }

A hierarchical tree widget with expandable/collapsible nodes.

Displays a forest of TreeNodes as an indented list. Supports keyboard navigation, expand/collapse, and optional lazy loading.

Implementations

impl<T> Tree<T>

pub fn new(roots: Vec<TreeNode<T>>) -> Self

Create a new tree with the given root nodes.

pub fn with_render_fn<F>(self, f: F) -> Self

where F: Fn(&T, usize, bool, bool) -> Vec<Segment> + 'static,

Set a custom render function for nodes.

Parameters: (data, depth, expanded, is_leaf) -> Segments

pub fn with_node_style(self, style: Style) -> Self

Set the style for unselected nodes.

pub fn with_selected_style(self, style: Style) -> Self

Set the style for the selected node.

pub fn with_border(self, border: BorderStyle) -> Self

Set the border style.

pub fn with_lazy_load<F>(self, f: F) -> Self

where F: Fn(&T) -> Vec<TreeNode<T>> + 'static,

Set a lazy load function for deferred child loading.

pub fn roots(&self) -> &[TreeNode<T>]

Get a reference to the root nodes.

pub fn selected(&self) -> usize

Get the selected visible node index.

pub fn scroll_offset(&self) -> usize

Get the scroll offset.

pub fn toggle_selected(&mut self)

Toggle expand/collapse at the selected node.

pub fn expand_selected(&mut self)

Expand the selected node (load children lazily if needed).

pub fn collapse_selected(&mut self)

Collapse the selected node.

pub fn selected_node(&self) -> Option<&TreeNode<T>>

Get a reference to the data of the selected visible node.

pub fn visible_count(&self) -> usize

Get the total number of visible nodes.

Trait Implementations

impl<T> InteractiveWidget for Tree<T>

fn handle_event(&mut self, event: &Event) -> EventResult

Handle an input event. Returns whether the event was consumed.

impl<T> Widget for Tree<T>

fn render(&self, area: Rect, buf: &mut ScreenBuffer)

Render this widget into the given area of the buffer.