Struct SelectionSet 

pub struct SelectionSet { /* private fields */ }

The editor’s selections: a primary plus zero or more extras. Invariants (enforced by normalize): extras sorted, deduped, none equal to the primary’s head.

Implementations

impl SelectionSet

pub fn primary(&self) -> Selection

pub fn heads(&self) -> Vec<usize>

Every head, primary first (0013 §3 cascade order).

pub fn extra_heads(&self) -> &[Selection]

pub fn count(&self) -> usize

pub fn set_head(&mut self, head: usize)

Move the primary head (motions, edits).

pub fn collapse_primary(&mut self, at: usize)

Move head and anchor together (leaving visual mode, plain moves).

pub fn stretch_primary(&mut self, anchor: usize, head: usize)

Enter/extend visual: the anchor stays, the head walks.

pub fn toggle_extra(&mut self)

Q: drop the extra under the primary, else plant one there.

pub fn plant_extra(&mut self, at: usize)

Plant an extra cursor (both ends at at). Never on the primary’s head — Space c and match-planting skip that spot; stacking on the primary is Q’s job (toggle_extra).

pub fn normalize(&mut self)

Sorted, deduped. An extra MAY sit on the primary’s head — Q plants exactly there, then a motion walks them apart (0013).

pub fn collapse_extras(&mut self)

Esc: extras die, primary stays.

pub fn set_extras(&mut self, heads: impl IntoIterator<Item = usize>)

Replace the extras wholesale — the motion cascade replants computed heads, and stacked-on-primary extras survive (they were planted by Q on purpose, 0013 §3).

pub fn remap(&mut self, at: usize, delta: isize)

After an edit shifted bytes: remap every head/anchor by delta at a point (the mirrored-edit cascade’s bookkeeping).

Trait Implementations

impl Clone for SelectionSet

fn clone(&self) -> SelectionSet

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SelectionSet

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

Formats the value using the given formatter.

impl Default for SelectionSet

fn default() -> Self

Returns the “default value” for a type.