ribir_core 0.4.0-alpha.18

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

#[derive(Clone)]
pub struct Opacity {
  pub opacity: f32,
}

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

impl Default for Opacity {
  #[inline]
  fn default() -> Self { Self { opacity: 1.0 } }
}

impl_compose_child_for_wrap_render!(Opacity);

impl WrapRender for Opacity {
  fn perform_layout(&self, clamp: BoxClamp, host: &dyn Render, ctx: &mut LayoutCtx) -> Size {
    host.perform_layout(clamp, ctx)
  }

  fn paint(&self, host: &dyn Render, ctx: &mut PaintingCtx) {
    if self.opacity > 0. {
      ctx.painter().apply_alpha(self.opacity);
      host.paint(ctx)
    }
  }
}