Struct GridPainter 

pub struct GridPainter { /* private fields */ }

Draws a GridSource onto a Canvas.

Owns the column layout and the font’s character map; glyphs come from the canvas’s shared cache. Painting a frame whose characters have all been drawn (or prewarmed) before allocates nothing; a character seen for the first time is mapped and rasterized, allocating once.

Implementations

impl GridPainter

pub fn new( columns: Vec<Column>, rows: u32, font: Font, px: f32, palette: Palette, ) -> Self

A painter for rows data rows of columns, in font at px pixels per em.

pub fn layout(&self) -> &GridLayout

The geometry this painter draws with.

pub fn palette(&self) -> &Palette

The colors this painter draws with.

pub fn columns(&self) -> &[Column]

The columns, left to right.

pub fn prewarm(&mut self, cache: &mut GlyphCache, chars: &str) -> usize

Rasterizes every character of chars into cache at every subpixel position now, so frames that only use them never rasterize (or allocate). Updates queue as usual.

Returns how many glyphs could not be cached (the atlas is too small for the set, or a glyph is larger than a page); they would be retried, and allocate, while painting.

pub fn paint<S: GridSource + ?Sized>( &mut self, source: &S, canvas: &mut Canvas<'_>, )

Draws the grid for source onto canvas.

pub fn paint_columns<S: GridSource + ?Sized>( &mut self, source: &S, canvas: &mut Canvas<'_>, columns: Range<usize>, )

Draws the grid for source onto canvas, asking for and drawing the cells of columns only (the header bar and row stripes still span the grid): for a widget that shows some columns scrolled and others frozen.

Trait Implementations

impl Debug for GridPainter

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

Formats the value using the given formatter.