Struct TreeViewState 

pub struct TreeViewState {
    pub collapsed: HashSet<String>,
    pub selected_index: usize,
    pub scroll: u16,
}

State for the tree view widget

Fields

collapsed: HashSet<String>

Set of collapsed node IDs

selected_index: usize

Currently selected index in the flattened visible list

scroll: u16

Scroll offset

Implementations

impl TreeViewState

pub fn new() -> Self

Create a new tree view state

pub fn toggle_collapsed(&mut self, id: &str)

Toggle the collapsed state of a node

pub fn is_collapsed(&self, id: &str) -> bool

Check if a node is collapsed

pub fn collapse(&mut self, id: &str)

Collapse a node

pub fn expand(&mut self, id: &str)

Expand a node

pub fn select_prev(&mut self)

Move selection up

pub fn select_next(&mut self, total_visible: usize)

Move selection down (needs total count)

pub fn ensure_visible(&mut self, viewport_height: usize)

Ensure selection is visible given viewport height

Trait Implementations

impl Clone for TreeViewState

fn clone(&self) -> TreeViewState

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for TreeViewState

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for TreeViewState

fn default() -> TreeViewState

Returns the “default value” for a type.