From ae5b297475f75328b23e8951e7c38973e26217b4 Mon Sep 17 00:00:00 2001
From: Jonathan Westhues <jwesthues@cq.cx>
Date: Thu, 7 Jan 2010 00:02:13 -0800
Subject: [PATCH] Add warning when user tries to toggle construction with
 nothing selected.

[git-p4: depot-paths = "//depot/solvespace/": change = 2097]
---
 graphicswin.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/graphicswin.cpp b/graphicswin.cpp
index a733ac3..579d15b 100644
--- a/graphicswin.cpp
+++ b/graphicswin.cpp
@@ -847,6 +847,10 @@ c:
         case MNU_CONSTRUCTION: {
             SS.UndoRemember();
             SS.GW.GroupSelection();
+            if(SS.GW.gs.entities == 0) {
+                Error("No entities are selected. Select entities before "
+                      "trying to toggle their construction state.");
+            }
             int i;
             for(i = 0; i < SS.GW.gs.entities; i++) {
                 hEntity he = SS.GW.gs.entity[i];