From 0163023aef4b2f99933ca201da45eba6aef93050 Mon Sep 17 00:00:00 2001
From: Florian Festi <ffesti@redhat.com>
Date: Sun, 21 Feb 2016 18:32:12 +0100
Subject: [PATCH] Add CompoundEdge

---
 boxes.py | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/boxes.py b/boxes.py
index a08e8dc..e5aa832 100755
--- a/boxes.py
+++ b/boxes.py
@@ -152,6 +152,26 @@ class OutSetEdge(Edge):
     def width(self):
         return self.boxes.thickness
 
+class CompoundEdge(Edge):
+    def __init__(self, boxes, types, lengths):
+        Edge.__init__(self, boxes, None)
+        self.types = [self.edges.get(edge, edge) for edge in types]
+        self.lengths = lengths
+        self.length = sum(lengths)
+
+    def width(self):
+        return self.types[0].width()
+        
+    def margin(self):
+        return max((e.margin() for e in self.types))
+
+    def __call__(self, length, **kw):
+        if length and abs(length - self.length) > 1E-5:
+            raise ValueError("Wrong length for CompoundEdge")
+        for e, l in zip(self.types, self.lengths):
+            # XXX different margins???
+            e(l)
+
 class Slot(Edge):
     def __init__(self, boxes, depth):
         Edge.__init__(self, boxes, None)