Struct TreeState 

pub struct TreeState {
    pub selected: usize,
    pub expanded: HashSet<String>,
    pub offset: usize,
    pub visible_count: usize,
}

State for the tree widget.

Fields

selected: usize

Currently selected node index in flattened view

expanded: HashSet<String>

Set of expanded node IDs

offset: usize

Scroll offset

visible_count: usize

Total visible items

Implementations

impl TreeState

pub fn new() -> Self

pub fn toggle_expand(&mut self, node_id: &str)

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

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

pub fn is_expanded(&self, node_id: &str) -> bool

pub fn select_next(&mut self)

pub fn select_prev(&mut self)

pub fn select_first(&mut self)

pub fn select_last(&mut self)

pub fn page_down(&mut self, page_size: usize)

pub fn page_up(&mut self, page_size: usize)

Trait Implementations

impl Clone for TreeState

fn clone(&self) -> TreeState

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TreeState

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

Formats the value using the given formatter.

impl Default for TreeState

fn default() -> TreeState

Returns the “default value” for a type.