teksilo-core 0.9.0

Core of the Teksilo GUI framework — widget trait, arena, layout engine, event dispatch, focus, signals and theming.
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// SPDX-License-Identifier: MPL-2.0
// SPDX-FileCopyrightText: 2026 FernTech

//! Tier-3 style protocol for `BarChart` / `LineChart` / `PieChart` (teksilo-charts).
//! Unlike every other Tier-3 trait, `ChartStyle` returns pure-data recipes only —
//! no `make_*(cfg, ctx) -> WidgetId` methods (charts are batched-paint). `RecipeChartStyle`,
//! the shipped default, lives in teksilo-charts itself (NOT teksilo-widgets), because
//! teksilo-charts does not depend on teksilo-widgets. teksilo-core only holds the trait
//! + the `Rc<dyn ChartStyle>` slot type.

use teksilo_tokens::Color;

use crate::styles::{BorderRecipe, FillRecipe, Theme};

#[derive(Clone, Copy, Debug)]
pub struct ChartFillContext<'a> {
    pub series_index: usize,
    pub resolved_color: Color,
    pub theme: &'a Theme,
}

pub trait ChartStyle: 'static {
    fn bar_fill(&self, cfg: &ChartFillContext) -> FillRecipe;
    fn area_fill(&self, cfg: &ChartFillContext, opacity: f32) -> FillRecipe;
    fn donut_fill(&self, cfg: &ChartFillContext) -> FillRecipe;
    fn gridline(&self, theme: &Theme) -> BorderRecipe;
}

pub type SharedChartStyle = std::rc::Rc<dyn ChartStyle>;