ribir_core 0.4.0-alpha.2

A non-intrusive declarative GUI framework, to build modern native/wasm cross-platform applications.
Documentation 
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use std::{
  any::{Any, TypeId},
  collections::HashMap,
};

use super::Theme;
use crate::context::BuildCtx;

/// A map can store any type of config, useful for widget which the common
/// information of theme mod not enough and need have itself theme.
#[derive(Default)]
pub struct CustomStyles {
  themes: HashMap<TypeId, Box<dyn Any>, ahash::RandomState>,
}

/// macro use to batch set custom theme.
#[macro_export]
macro_rules! fill_custom_style {
  ($theme: ident, $($v: expr),+) => {
    $($theme.custom_styles.set_custom_style($($v)+);)+
  };
}

pub trait CustomStyle: Sized + Clone + 'static {
  fn default_style(ctx: &BuildCtx) -> Self;

  #[inline]
  fn of(ctx: &BuildCtx) -> Self {
    let tid = TypeId::of::<Self>();
    let c = ctx.find_cfg(|t| match t {
      Theme::Full(t) => t.custom_styles.themes.get(&tid),
      Theme::Inherit(i) => i
        .custom_styles
        .as_ref()
        .and_then(|c| c.themes.get(&tid)),
    });

    c.and_then(|c| c.downcast_ref::<Self>())
      .cloned()
      .unwrap_or_else(|| Self::default_style(ctx))
  }
}

impl CustomStyles {
  #[inline]
  pub fn set_custom_style<T: CustomStyle + 'static>(&mut self, v: T) {
    self.themes.insert(v.type_id(), Box::new(v));
  }
}