ribir_core 0.4.0-alpha.28

A non-intrusive declarative GUI framework, to build modern native/wasm cross-platform applications.
Documentation 
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use crate::prelude::*;

/// This widget establishes the text style for painting the text within its
/// descendants.
pub struct TextStyleWidget {
  pub text_style: TextStyle,
}

impl Declare for TextStyleWidget {
  type Builder = FatObj<()>;
  #[inline]
  fn declarer() -> Self::Builder { FatObj::new(()) }
}

impl<'c> ComposeChild<'c> for TextStyleWidget {
  type Child = Widget<'c>;

  fn compose_child(this: impl StateWriter<Value = Self>, child: Self::Child) -> Widget<'c> {
    Providers::new([Self::into_provider(this)]).with_child(child)
  }
}

impl TextStyleWidget {
  pub fn into_provider(this: impl StateWriter<Value = Self>) -> Provider {
    match this.try_into_value() {
      Ok(this) => Provider::new(this.text_style),
      Err(this) => Provider::value_of_writer(
        this.map_writer(|w| PartMut::new(&mut w.text_style)),
        Some(DirtyPhase::LayoutSubtree),
      ),
    }
  }
}