mirui 0.45.0

A lightweight, no_std ECS-driven UI framework for embedded, desktop, and WebAssembly
Documentation 
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#![allow(clippy::needless_update)]

use crate::prelude::draw::*;
use crate::prelude::*;
use crate::render::raster::FillRule;
use crate::render::scene::{LineCap, LineJoin, Paint};
use crate::types::Transform;
use crate::ui::Theme;
use crate::ui::widgets::{ParagraphStyle, Text};

#[derive(Default)]
pub struct FillRules;

static STAR: Path = path!(
    M 100 18
    L 148.198 166.34
    L 22.013 74.661
    L 177.987 74.661
    L 51.802 166.34
    Z
);
const LOGICAL_WIDTH: i32 = 400;
const LOGICAL_HEIGHT: i32 = 240;

fn fill_rules_render(
    renderer: &mut dyn Renderer,
    world: &World,
    _entity: Entity,
    rect: &Rect,
    ctx: &mut ViewCtx,
) {
    let default_theme = Theme::default();
    let theme = world.resource::<Theme>().unwrap_or(&default_theme);
    let fill = Paint::Color(theme.resolve(ColorToken::Secondary).into());
    let stroke = Paint::Color(theme.resolve(ColorToken::OnSurface).into());
    let canvas =
        crate::gallery::fit_logical_canvas(*rect, ctx.transform, LOGICAL_WIDTH, LOGICAL_HEIGHT);

    for (transform, rule) in [
        (
            Transform::translate(Fixed::from_int(12), Fixed::from_int(16)),
            FillRule::EvenOdd,
        ),
        (
            Transform::translate(Fixed::from_int(188), Fixed::from_int(16)),
            FillRule::NonZero,
        ),
    ] {
        ctx.draw(
            renderer,
            &DrawCommand::FillPath {
                path: &STAR,
                transform: canvas.compose(&transform),
                paint: &fill,
                opa: 245,
                fill_rule: rule,
            },
            ctx.clip,
        );
        ctx.draw(
            renderer,
            &DrawCommand::StrokePath {
                path: &STAR,
                transform: canvas.compose(&transform),
                paint: &stroke,
                width: Fixed::from_int(2),
                opa: 235,
                line_cap: LineCap::Round,
                line_join: LineJoin::Round,
                miter_limit: Fixed::from_int(4),
                dash: &[],
            },
            ctx.clip,
        );
    }
}

pub fn fill_rules_view() -> View {
    View::new("FillRules", 60, fill_rules_render).with_filter::<FillRules>()
}

#[compose]
pub fn build_widgets() {
    ui! {
        Column (
            grow: 1.0,
            align: AlignItems::Center,
            justify: JustifyContent::FlexEnd,
            padding: Padding::all(10)
        ) {
            Row (height: 24) {
                Text (
                    "EvenOdd",
                    width: 92,
                    height: 22,
                    text_color: ColorToken::OnSurface,
                    paragraph: ParagraphStyle::label()
                )
                Text (
                    "NonZero",
                    width: 92,
                    height: 22,
                    text_color: ColorToken::OnSurface,
                    paragraph: ParagraphStyle::label()
                )
            }
            FillRules (
                position: Position::Absolute,
                left: 0,
                top: 0,
                width: Dimension::percent(100),
                height: Dimension::percent(100)
            )
        }
    };
}

#[cfg(feature = "std")]
pub fn setup_app<B, F>(app: &mut App<B, F>, parent: Entity)
where
    B: Surface,
    F: RendererFactory<B>,
{
    app.with_widget(fill_rules_view());
    app.compose(parent, build_widgets);
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn star_geometry_stays_in_static_storage() {
        assert!(STAR.is_borrowed());
    }

    #[test]
    fn logical_canvas_stays_inside_phone_bounds() {
        let rect = Rect {
            x: Fixed::from_int(8),
            y: Fixed::from_int(12),
            w: Fixed::from_int(304),
            h: Fixed::from_int(544),
        };
        let transform = crate::gallery::fit_logical_canvas(
            rect,
            Transform::IDENTITY,
            LOGICAL_WIDTH,
            LOGICAL_HEIGHT,
        );
        let top_left = transform.apply_point(Point::ZERO);
        let bottom_right = transform.apply_point(Point::new(
            Fixed::from_int(LOGICAL_WIDTH),
            Fixed::from_int(LOGICAL_HEIGHT),
        ));
        assert!(top_left.x >= rect.x && top_left.y >= rect.y);
        assert!(bottom_right.x <= rect.x + rect.w);
        assert!(bottom_right.y <= rect.y + rect.h);
    }
}