Struct TreeSliceHandle 

pub struct TreeSliceHandle<T: 'static> { /* private fields */ }

Lightweight handle to a TreeSlice’s shared state, usable in closures.

Created via TreeSlice::handle. Shares all Rc-based internals with its parent TreeSlice but does not keep the tree-change observer alive — the TreeSlice that owns the observer must outlive all handles that rely on automatic re-flattening on model changes.

Implementations

impl<T: 'static> TreeSliceHandle<T>

pub fn visible_count(&self) -> usize

Number of currently-visible (flattened) rows.

pub fn entry_at(&self, flat_index: usize) -> Option<FlatEntry>

Get the FlatEntry at flat_index (cloned), or None if out of bounds.

pub fn visible_node_id(&self, flat_index: usize) -> Option<NodeId>

Get the NodeId at flat_index, or None if out of bounds.

pub fn expand(&self, node: NodeId)

Expand node (make its children visible) and bump the version signal. No-op if already expanded.

pub fn collapse(&self, node: NodeId)

Collapse node (hide its children) and bump the version signal. No-op if already collapsed.

pub fn is_expanded(&self, node: NodeId) -> bool

Returns true if node is currently expanded.

pub fn toggle_expand(&self, node: NodeId)

Toggle node’s expand/collapse state and bump the version signal.

pub fn tree(&self) -> &TreeModel<T>

Access the underlying TreeModel.

pub fn expand_all(&self)

Expand every node with children — see TreeSlice::expand_all. Useful after a model rebuild reassigns NodeIds (the old expand set no longer matches), to keep the view fully expanded.

pub fn first_changed_index(&self) -> Option<usize>

See TreeSlice::first_changed_index.

Trait Implementations

impl<T: 'static> Clone for TreeSliceHandle<T>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.