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 crate::prelude::*;

/// Widget with fixed size as a container for its child.
#[derive(Declare, SingleChild)]
pub struct Container {
  pub size: Size,
}

impl Render for Container {
  fn perform_layout(&self, mut clamp: BoxClamp, ctx: &mut LayoutCtx) -> Size {
    if let Some(mut l) = ctx.single_child_layouter() {
      clamp.max = clamp.max.min(self.size);
      clamp.min = clamp.max.min(clamp.min);
      l.perform_widget_layout(clamp);
    };
    self.size
  }

  #[inline]
  fn paint(&self, _: &mut PaintingCtx) {}

  #[inline]
  fn only_sized_by_parent(&self) -> bool { true }
}

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

  use super::*;
  use crate::test_helper::*;

  const SIZE: Size = Size::new(100., 100.);
  fn smoke() -> impl WidgetBuilder {
    fn_widget! { @Container { size: SIZE }}
  }
  widget_layout_test!(smoke, size == SIZE,);
}