From 92c01da36016e94ff20163806ddcbcf7e33d4031 Mon Sep 17 00:00:00 2001
From: Laurenz <laurmaedje@gmail.com>
Date: Sat, 10 Oct 2020 22:19:36 +0200
Subject: =?UTF-8?q?Switch=20back=20to=20custom=20geometry=20types,=20unifi?=
 =?UTF-8?q?ed=20with=20layout=20primitives=20=F0=9F=8F=9E?=
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---
 src/layout/document.rs | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 src/layout/document.rs

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

diff --git a/src/layout/document.rs b/src/layout/document.rs
new file mode 100644
index 00000000..c2d7b38b
--- /dev/null
+++ b/src/layout/document.rs
@@ -0,0 +1,47 @@
+use super::*;
+
+/// The top-level layout node.
+#[derive(Debug, Clone, PartialEq)]
+pub struct Document {
+    pub runs: Vec<Pages>,
+}
+
+impl Document {
+    /// Layout the document.
+    pub async fn layout(&self, ctx: &mut LayoutContext) -> Vec<BoxLayout> {
+        let mut layouts = vec![];
+        for run in &self.runs {
+            layouts.extend(run.layout(ctx).await);
+        }
+        layouts
+    }
+}
+
+/// A variable-length run of pages that all have the same properties.
+#[derive(Debug, Clone, PartialEq)]
+pub struct Pages {
+    /// The size of the pages.
+    pub size: Size,
+    /// The layout node that produces the actual pages.
+    pub child: LayoutNode,
+}
+
+impl Pages {
+    /// Layout the page run.
+    pub async fn layout(&self, ctx: &mut LayoutContext) -> Vec<BoxLayout> {
+        let constraints = LayoutConstraints {
+            spaces: vec![LayoutSpace { base: self.size, size: self.size }],
+            repeat: true,
+        };
+
+        self.child
+            .layout(ctx, constraints)
+            .await
+            .into_iter()
+            .filter_map(|item| match item {
+                LayoutItem::Spacing(_) => None,
+                LayoutItem::Box(layout, _) => Some(layout),
+            })
+            .collect()
+    }
+}
-- 
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