Struct Selection 

pub struct Selection { /* private fields */ }

A set of selected nodes with a primary (most recently selected) node.

Implementations

impl Selection

pub fn new() -> Self

Create an empty selection.

pub fn version(&self) -> u64

Monotonically increasing generation counter.

Incremented by wrapping_add(1) on every mutation. Compare against a cached value to detect selection changes without hashing.

pub fn select_one(&mut self, id: NodeId)

Clear the selection and select a single node.

pub fn toggle(&mut self, id: NodeId)

Toggle a node’s selection (shift-click behavior). If added, it becomes the primary. If removed, primary is cleared (or set to an arbitrary remaining node).

pub fn add(&mut self, id: NodeId)

Add a node to the selection without removing others.

pub fn remove(&mut self, id: NodeId)

Remove a node from the selection.

pub fn clear(&mut self)

Clear the entire selection.

pub fn extend(&mut self, ids: impl IntoIterator<Item = NodeId>)

Add multiple nodes (e.g. from box select). The last one becomes primary.

pub fn select_all(&mut self, ids: impl IntoIterator<Item = NodeId>)

Replace the entire selection with the given set.

pub fn contains(&self, id: NodeId) -> bool

Whether the given node is selected.

pub fn primary(&self) -> Option<NodeId>

The most recently selected node.

pub fn iter(&self) -> impl Iterator<Item = &NodeId>

Iterate over all selected node IDs.

pub fn len(&self) -> usize

Number of selected nodes.

pub fn is_empty(&self) -> bool

Whether the selection is empty.

pub fn centroid( &self, position_fn: impl Fn(NodeId) -> Option<Vec3>, ) -> Option<Vec3>

Compute the centroid (average position) of all selected nodes.

position_fn resolves a node ID to its world-space position. Returns None if the selection is empty or no positions are available.

pub fn diff(&self, previous: &Selection) -> (Vec<NodeId>, Vec<NodeId>)

Compute the difference between this selection and a previous one.

Returns (added, removed) — IDs that are in self but not previous, and IDs that are in previous but not self.

Trait Implementations

impl Clone for Selection

fn clone(&self) -> Selection

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Selection

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

Formats the value using the given formatter.

impl Default for Selection

fn default() -> Self

Returns the “default value” for a type.