Struct Selection 

pub struct Selection {
    pub id: SelectionId,
    pub goal: Option<u32>,
    /* private fields */
}

A directional byte-offset range. start <= end is an invariant; reversed records whether the caret is at start (true) or end (false).

Fields

id: SelectionId

Stable identity within its set.

goal: Option<u32>

Goal for vertical movement: a display cell — the caret’s visual column, kept through tab stops and collapsed folds. Cleared by any horizontal move or edit.

Implementations

impl Selection

pub fn caret(id: SelectionId, offset: u32) -> Self

A caret (empty selection) with the given id at offset.

pub fn from_anchor(id: SelectionId, anchor: u32, head: u32) -> Self

A selection from anchor to head (either order); reversed is derived so the caret sits at head.

pub fn start(&self) -> u32

Lower bound (inclusive).

pub fn end(&self) -> u32

Upper bound (exclusive-ish — the position past the selection).

pub fn head(&self) -> u32

The moving end (where the caret is).

pub fn tail(&self) -> u32

The fixed end (the anchor).

pub fn is_empty(&self) -> bool

Whether this is a bare caret.

pub fn set_head(&mut self, offset: u32)

Move the head to offset, keeping the tail fixed (extends/shrinks the selection, flipping direction if the head crosses the tail). Clears the goal column.

pub fn collapse_to_head(&mut self)

Collapse to a caret at the head.

pub fn move_to_caret(&mut self, offset: u32)

Collapse to a caret at offset, keeping this selection’s id and clearing the goal column. The movement layer’s “plain move” primitive.

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 Copy for Selection

impl Debug for Selection

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

Formats the value using the given formatter.

impl Eq for Selection

impl PartialEq for Selection

fn eq(&self, other: &Selection) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Selection