Struct StyleRange 

pub struct StyleRange { /* private fields */ }

RLE-compressed style storage for a worksheet range.

Instead of storing one Style per cell (which wastes memory when many cells share the same style), this stores:

• A palette of unique styles
• Runs of consecutive cells (row-major) that share the same style

This dramatically reduces memory usage and clone overhead for large worksheets.

Implementations

impl StyleRange

pub fn empty() -> Self

Create an empty StyleRange

pub fn from_style_ids( cells: Vec<(u32, u32, usize)>, palette: Vec<Style>, ) -> Self

Create a StyleRange from style IDs and a palette (zero-copy).

This is more efficient than from_sparse as it avoids cloning styles.

• cells: Vec of (row, col, style_id) where style_id indexes into palette
• palette: The shared palette of unique styles (taken ownership)

pub fn from_sparse(cells: Vec<(u32, u32, Style)>) -> Self

Create a StyleRange from sparse cell data

Takes cells with positions and styles, compresses into RLE format.

pub fn start(&self) -> Option<(u32, u32)>

Get the start position of the range

pub fn end(&self) -> Option<(u32, u32)>

Get the end position of the range

pub fn is_empty(&self) -> bool

Check if the range is empty

pub fn width(&self) -> usize

Get width of the range

pub fn height(&self) -> usize

Get height of the range

pub fn get(&self, pos: (usize, usize)) -> Option<&Style>

Get style at a position (relative to range start)

Returns None if position is out of bounds, or reference to style.

pub fn cells(&self) -> StyleRangeCells<'_>

Iterate over all cells with their positions and styles

pub fn unique_style_count(&self) -> usize

Get number of unique styles (excluding empty)

pub fn run_count(&self) -> usize

Get number of RLE runs (for diagnostics)

pub fn compression_ratio(&self) -> f64

Get compression ratio (cells / runs)

Trait Implementations

impl Clone for StyleRange

fn clone(&self) -> StyleRange

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for StyleRange

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

Formats the value using the given formatter.

impl Default for StyleRange

fn default() -> StyleRange

Returns the “default value” for a type.