Struct VisualRowIndex 

pub struct VisualRowIndex { /* private fields */ }

The index itself: prefix sums + line-start byte offsets, plus the key the index was built for so callers can detect staleness.

Implementations

impl VisualRowIndex

pub fn is_built_for(&self, key: &VisualRowIndexKey) -> bool

pub fn clear(&mut self)

Discard any cached state — used when the editor knows the underlying buffer changed in ways the key wouldn’t catch (e.g. buffer swap).

pub fn line_count(&self) -> usize

Number of logical lines covered (== prefix_sums.len() - 1).

pub fn total_rows(&self) -> u32

Total visual rows across all logical lines (O(1)).

pub fn line_first_row(&self, line_idx: usize) -> u32

First visual row of logical line line_idx (O(1)).

pub fn line_row_count(&self, line_idx: usize) -> u32

Visual row count of logical line line_idx (O(1)).

pub fn line_start_byte(&self, line_idx: usize) -> usize

Byte offset of the start of logical line line_idx (O(1)).

pub fn line_for_byte(&self, byte: usize) -> (usize, usize)

Find the logical line that contains byte offset byte (O(log N)). Returns (line_idx, line_start_byte). Bytes past the last line resolve to the last line.

pub fn position_at_row(&self, row: u32) -> (usize, usize, usize)

Convert an absolute visual row to (line_idx, line_start_byte, offset_in_line). Saturates to the last valid row if row is out of range. O(log N).

Trait Implementations

impl Clone for VisualRowIndex

fn clone(&self) -> VisualRowIndex

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for VisualRowIndex

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

Formats the value using the given formatter.

impl Default for VisualRowIndex

fn default() -> VisualRowIndex

Returns the “default value” for a type.