Struct TreeState 

pub struct TreeState { /* private fields */ }

Tree state tracks the current state for the component tree.

Implementations

impl TreeState

pub fn is_open<V>(&self, node: &Node<V>) -> bool

Returns whether node is open

pub fn is_closed<V>(&self, node: &Node<V>) -> bool

Returns whether node is closed

pub fn selected(&self) -> Option<&str>

Get current selected item

pub fn is_selected<V>(&self, node: &Node<V>) -> bool

Returns whether provided node is currently selected

pub fn first_sibling<'a, V>(&self, tree: &'a Node<V>) -> Option<&'a Node<V>>

Get first sibling in children of current selected node’s parent

pub fn last_sibling<'a, V>(&self, tree: &'a Node<V>) -> Option<&'a Node<V>>

Get last sibling in children of current selected node’s parent

pub fn tree_changed<V>(&mut self, root: &Node<V>, preserve: bool)

The tree has changed, so this method must check whether to keep states or not

pub fn open<V>(&mut self, root: &Node<V>)

Open currently selected node. Node can be open only if it is closed and it is NOT a leaf

pub fn close<V>(&mut self, root: &Node<V>)

Close currently selected node. If node has children, then all children are closed recursively

pub fn move_down<V>(&mut self, root: &Node<V>)

Move cursor down in current tree from current position. Rewind if required

pub fn move_up<V>(&mut self, root: &Node<V>)

Move cursor up in current tree from current position. Rewind if required

pub fn select<V>(&mut self, root: &Node<V>, node: &Node<V>)

Set current selected node. When selecting a node, all its ancestors will be opened

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 Default for TreeState

fn default() -> TreeState

Returns the “default value” for a type.