Struct TreeState 

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

State for a Tree component.

Implementations

impl<T: Clone> TreeState<T>

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

Creates a new tree state with the given root nodes.

Example

use envision::component::{TreeState, TreeNode};

let roots = vec![
    TreeNode::new("Root 1", 1),
    TreeNode::new("Root 2", 2),
];
let state = TreeState::new(roots);
assert_eq!(state.roots().len(), 2);

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

Returns the root nodes.

pub fn roots_mut(&mut self) -> &mut Vec<TreeNode<T>>

Returns a mutable reference to the root nodes.

pub fn set_roots(&mut self, roots: Vec<TreeNode<T>>)

Sets the root nodes.

pub fn selected_index(&self) -> usize

Returns the currently selected index in the flattened view.

pub fn is_empty(&self) -> bool

Returns true if the tree is empty.

pub fn selected_path(&self) -> Option<Vec<usize>>

Returns the path of the currently selected node.

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

Returns a reference to the currently selected node.

pub fn expand_all(&mut self)

Expands all nodes in the tree.

pub fn collapse_all(&mut self)

Collapses all nodes in the tree.

pub fn visible_count(&self) -> usize

Returns the number of visible nodes.

Trait Implementations

impl<T: Clone> Clone for TreeState<T>

fn clone(&self) -> TreeState<T>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for TreeState<T>

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

Formats the value using the given formatter.

impl<T: Clone> Default for TreeState<T>

fn default() -> Self

Returns the “default value” for a type.