ribir_core 0.2.0-alpha.3

Ribir is a framework for building modern native/wasm cross-platform user interface applications.
Documentation 
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use crate::prelude::*;

/// Widget let user to access the layout result of its child.
#[derive(Declare)]
pub struct LayoutBox {
  #[declare(skip)]
  /// the rect box of its child and the coordinate is relative to its parent.
  rect: Rect,
}

impl ComposeChild for LayoutBox {
  type Child = Widget;
  fn compose_child(this: impl StateWriter<Value = Self>, child: Self::Child) -> impl WidgetBuilder {
    fn_widget! {
      @ $child {
        on_performed_layout: move |e| {
          let new_rect = e.box_rect().unwrap();
          if $this.rect != new_rect {
            $this.silent().rect = new_rect;
          }
        }
      }
    }
  }
}

impl LayoutBox {
  /// return the rect after layout of the widget
  #[inline]
  pub fn layout_rect(&self) -> Rect { self.rect }

  /// return the position relative to parent after layout of the widget
  #[inline]
  pub fn layout_pos(&self) -> Point { self.rect.origin }

  /// return the size after layout of the widget
  #[inline]
  pub fn layout_size(&self) -> Size { self.rect.size }

  /// return the left position relative parent after layout of the widget
  #[inline]
  pub fn layout_left(&self) -> f32 { self.rect.min_x() }

  /// return the top position relative parent after layout of the widget
  #[inline]
  pub fn layout_top(&self) -> f32 { self.rect.min_y() }

  /// return the width after layout of the widget
  #[inline]
  pub fn layout_width(&self) -> f32 { self.rect.width() }

  /// return the height after layout of the widget
  #[inline]
  pub fn layout_height(&self) -> f32 { self.rect.height() }
}

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

  fn smoke() -> impl WidgetBuilder {
    fn_widget! {
      let mut first_box = @MockBox { size: Size::new(100., 200.) };
      let second_box = @MockBox { size: pipe!($first_box.layout_size()) };
      @MockMulti {
        @ { [first_box, second_box  ] }
      }
    }
  }
  widget_layout_test!(
    smoke,
    { path = [0], width == 200., height == 200.,}
    { path = [0, 0], width == 100., height == 200.,}
    { path = [0, 1], width == 100., height == 200.,}
  );
}