From 8c1d1e78607436d66bb90bbf4299e97854967d9c Mon Sep 17 00:00:00 2001
From: amwaterhouse <Andrew Waterhouse>
Date: Thu, 10 Aug 2006 14:57:40 +0000
Subject: [PATCH] Check selection size before making tree

---
 src/jalview/appletgui/AlignFrame.java |   19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/src/jalview/appletgui/AlignFrame.java b/src/jalview/appletgui/AlignFrame.java
index 6592399..d72c665 100755
--- a/src/jalview/appletgui/AlignFrame.java
+++ b/src/jalview/appletgui/AlignFrame.java
@@ -1597,7 +1597,8 @@ public void itemStateChanged(ItemEvent evt)
 
   public void pairwiseAlignmentMenuItem_actionPerformed()
   {
-    if (viewport.getSelectionGroup().getSize(false) > 1)
+    if (viewport.getSelectionGroup()!=null
+        && viewport.getSelectionGroup().getSize(false) > 1)
     {
       Frame frame = new Frame();
       frame.add(new PairwiseAlignPanel(alignPanel));
@@ -1686,13 +1687,19 @@ public void itemStateChanged(ItemEvent evt)
 
     }
 
-    final TreePanel tp = new TreePanel(viewport,
-                         type,
-                         pwType);
+    if ( (viewport.getSelectionGroup() != null &&
+          viewport.getSelectionGroup().getSize(false) > 1)
+      || (viewport.getSelectionGroup() == null
+          && viewport.alignment.getHeight() > 1))
+    {
+      final TreePanel tp = new TreePanel(viewport,
+                                         type,
+                                         pwType);
 
-    addTreeMenuItem(tp, title);
+      addTreeMenuItem(tp, title);
 
-    jalview.bin.JalviewLite.addFrame(tp, title, 600, 500);
+      jalview.bin.JalviewLite.addFrame(tp, title, 600, 500);
+    }
   }
 
   void loadTree_actionPerformed()
-- 
1.7.10.2