From 749637716f3450650861e54fa7b8cefab3c532c7 Mon Sep 17 00:00:00 2001
From: Walter Bender <walter@sugarlabs.org>
Date: Wed, 13 Oct 2010 15:25:07 +0000
Subject: prevent blocks from being moved off the top of the screen

---
(limited to 'TurtleArt')

diff --git a/TurtleArt/tawindow.py b/TurtleArt/tawindow.py
index b3d14cf..f620958 100644
--- a/TurtleArt/tawindow.py
+++ b/TurtleArt/tawindow.py
@@ -1214,18 +1214,14 @@ class TurtleArtWindow():
 
             self.drag_group = find_group(blk)
 
-            # Prevent blocks from ending up with a negative x...
+            # Prevent blocks from ending up with a negative x or y
             for blk in self.drag_group:
                 (bx, by) = blk.spr.get_xy()
                 if bx + dx < 0:
                     dx = -bx
+                if by + dy < 0:
+                    dy = -by
 
-            # Move the stack
-            """
-            for blk in self.drag_group:
-                (bx, by) = blk.spr.get_xy()
-                blk.spr.move((bx + dx, by + dy), not blk.status=='collapsed')
-            """
             # Calculate a bounding box and only invalidate once.
             minx = blk.spr.rect.x
             miny = blk.spr.rect.y
@@ -2014,6 +2010,8 @@ class TurtleArtWindow():
             (sx, sy) = blk.spr.get_xy()
             if sx + dx < 0:
                 dx += -(sx + dx)
+            if sy + dy < 0:
+                dy += -(sy + dy)
 
         for blk in self.drag_group:
             (sx, sy) = blk.spr.get_xy()
--
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