From 8469bad7487e111c8e5a0ec542f0232a0ebb4bdc Mon Sep 17 00:00:00 2001
From: Martin Haug <mhaug@live.de>
Date: Thu, 4 Feb 2021 21:30:18 +0100
Subject: =?UTF-8?q?Add=20rectangle=20function=20=F0=9F=8E=9B?=
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---
 src/layout/rect.rs | 71 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 src/layout/rect.rs

(limited to 'src/layout/rect.rs')

diff --git a/src/layout/rect.rs b/src/layout/rect.rs
new file mode 100644
index 00000000..ab8e3b07
--- /dev/null
+++ b/src/layout/rect.rs
@@ -0,0 +1,71 @@
+use std::cmp::Ordering;
+
+use super::*;
+use crate::{color::RgbaColor, geom::Linear};
+
+/// A node that represents a rectangular box.
+#[derive(Debug, Clone, PartialEq)]
+pub struct NodeRect {
+    /// The fixed width, if any.
+    pub width: Option<Linear>,
+    /// The fixed height, if any.
+    pub height: Option<Linear>,
+    /// The background color.
+    pub color: Option<Color>,
+    /// The child node whose sides to pad.
+    pub child: Node,
+}
+
+impl Layout for NodeRect {
+    fn layout(&self, ctx: &mut LayoutContext, areas: &Areas) -> Layouted {
+        let Areas { current, full, .. } = areas;
+
+        let height_opt = self.height.map(|h| h.resolve(full.height));
+        let mut size = Size::new(
+            self.width.map(|w| w.resolve(full.width)).unwrap_or(current.width),
+            height_opt.unwrap_or(current.height),
+        );
+
+        let areas = Areas::once(size);
+        let mut layouted = self.child.layout(ctx, &areas);
+
+        // If the children have some height, apply that,
+        // otherwise fall back to zero or the height property.
+        if let Some(max) = layouted
+            .frames()
+            .iter()
+            .map(|f| f.size.height)
+            .max_by(|x, y| x.partial_cmp(y).unwrap_or(Ordering::Equal))
+        {
+            size.height = max;
+        } else {
+            size.height = height_opt.unwrap_or(Length::ZERO)
+        }
+
+        if let Some(first) = layouted.frames_mut().first_mut() {
+            first.elements.insert(
+                0,
+                (
+                    Point::ZERO,
+                    Element::Geometry(Geometry {
+                        shape: Shape::Rect(Rect { size }),
+                        fill: Fill::Color(self.color.unwrap_or(Color::Rgba(RgbaColor {
+                            r: 255,
+                            g: 255,
+                            b: 255,
+                            a: 0,
+                        }))),
+                    }),
+                ),
+            )
+        }
+
+        layouted
+    }
+}
+
+impl From<NodeRect> for NodeAny {
+    fn from(pad: NodeRect) -> Self {
+        Self::new(pad)
+    }
+}
-- 
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