Trait Drawable

Source

pub trait Drawable: Send + Sync {
    // Required methods
    fn bounds(&self, context: &DrawContext) -> Result<Rect, ValidationError>;
    fn draw(
        &self,
        context: &DrawContext,
        canvas: &mut Canvas<'_>,
    ) -> Result<(), ValidationError>;

    // Provided method
    fn baseline(&self, _context: &DrawContext) -> Option<f64> { ... }
}

Expand description

Content whose bounds and drawing share the same logical coordinates.

Implementations must be deterministic and time independent for fixed inputs. Bounds are supplied by content. Custom content must enclose its own drawing; the frontend validates bounds and commands but cannot prove arbitrary callbacks return conservative bounds.

use motion_core::prelude::*;
use motion_core::{
    DisplayList, RasterLimits, ResourceStore, ValidatedDisplayList, MAX_PATH_VERBS,
    MAX_STROKE_VERBS, MAX_SVG_PATH_BYTES, sample_offsets,
};
let row = Row::new()
    .gap(4.0)
    .children([
        Rect::new(0.0, 0.0, 10.0, 20.0).fill(Color::from_hex(0x24a49b)),
        Rect::new(0.0, 0.0, 5.0, 10.0).fill(Color::WHITE),
    ])
    .at(Point::new(100.0, 80.0));
assert_eq!(
    row.measure(ValidationLimits::default())?,
    Rect::new(90.5, 70.0, 109.5, 90.0)
);
let list = row.compile(
    Size::new(200.0, 160.0),
    PixelSize::new(200, 160),
    ValidationLimits::default(),
)?;
assert_eq!(list.commands.len(), 2);