Struct LineLayout 

pub struct LineLayout {
    pub len_bytes: usize,
    pub width: u16,
    /* private fields */
}

A laid-out line: grapheme spans in order.

Fields

len_bytes: usize

The line’s byte length (cursor-at-end needs it).

width: u16

Total rendered width in cells.

Implementations

impl LineLayout

pub fn build(text: &str, tab: u16) -> Self

Lay out one line’s text (no trailing newline). tab is the tab stop; control chars render zero-width (terminals show them raw).

pub fn spans(&self) -> &[GraphemeSpan]

The grapheme spans, in order.

pub fn cell_at_byte(&self, byte: usize) -> u16

Display cell where a byte offset renders (cursor placement). A byte mid-cluster maps to the cluster’s cell; at/past the end maps to the line’s end cell (vim’s virtual cursor position).

pub fn byte_at_cell(&self, cell: u16) -> usize

Byte offset of the cluster at a display cell (mouse hit-testing, desired-column). A cell inside a wide cluster maps to its start; past the end maps to the line’s byte length… caller clamps.

pub fn is_ascii_fast(&self) -> bool

Is the line free of wide/zero-width complications? Hot paths may skip the layout for the common ASCII case.

Trait Implementations

impl Clone for LineLayout

fn clone(&self) -> LineLayout

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LineLayout

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

Formats the value using the given formatter.

impl Default for LineLayout

fn default() -> LineLayout

Returns the “default value” for a type.