Add margins with basic box layouter 📖

1 files changed, 37 insertions, 0 deletions

diff --git a/src/layout/boxed.rs b/src/layout/boxed.rs
new file mode 100644
index 00000000..cfdf51f2
--- /dev/null
+++ b/src/layout/boxed.rs
@@ -0,0 +1,37 @@
+//! Layouting of layout boxes.
+
+use crate::doc::TextAction;
+use super::{Layouter, Layout, LayoutContext, LayoutResult, Position};
+
+
+/// Layouts sublayouts within the constraints of a layouting context.
+#[derive(Debug)]
+pub struct BoxLayouter<'a, 'p> {
+    ctx: &'a LayoutContext<'a, 'p>,
+    actions: Vec<TextAction>,
+}
+
+impl<'a, 'p> BoxLayouter<'a, 'p> {
+    /// Create a new box layouter.
+    pub fn new(ctx: &'a LayoutContext<'a, 'p>) -> BoxLayouter<'a, 'p> {
+        BoxLayouter {
+            ctx,
+            actions: vec![],
+        }
+    }
+
+    /// Add a sublayout.
+    pub fn add_layout_absolute(&mut self, position: Position, layout: Layout) {
+        self.actions.push(TextAction::MoveNewline(position));
+        self.actions.extend(layout.actions);
+    }
+}
+
+impl Layouter for BoxLayouter<'_, '_> {
+    fn finish(self) -> LayoutResult<Layout> {
+        Ok(Layout {
+            extent: self.ctx.max_extent.clone(),
+            actions: self.actions
+        })
+    }
+}