X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;ds=sidebyside;f=src%2Fjalview%2Fviewmodel%2FViewportRanges.java;h=24ff57f46861e3ffed3004250946f89b97892260;hb=9317de4ce997ec39dee25ec507c12807c5067d7d;hp=42d490ea1fcdf2abb3b3d16753a88b4b42012364;hpb=be762d8d9c71a7aa3121e845c45911c7192b7827;p=jalview.git

diff --git a/src/jalview/viewmodel/ViewportRanges.java b/src/jalview/viewmodel/ViewportRanges.java
index 42d490e..24ff57f 100644
--- a/src/jalview/viewmodel/ViewportRanges.java
+++ b/src/jalview/viewmodel/ViewportRanges.java
@@ -402,23 +402,39 @@ public class ViewportRanges extends ViewportProperties
    */
   public boolean scrollUp(boolean up)
   {
+    /*
+     * if in unwrapped mode, scroll up or down one sequence row;
+     * if in wrapped mode, scroll by one visible width of columns
+     */
     if (up)
     {
-      if (startSeq < 1)
+      if (wrappedMode)
       {
-        return false;
+        pageUp();
+      }
+      else
+      {
+        if (startSeq < 1)
+        {
+          return false;
+        }
+        setStartSeq(startSeq - 1);
       }
-
-      setStartSeq(startSeq - 1);
     }
     else
     {
-      if (endSeq >= getVisibleAlignmentHeight() - 1)
+      if (wrappedMode)
       {
-        return false;
+        pageDown();
+      }
+      else
+      {
+        if (endSeq >= getVisibleAlignmentHeight() - 1)
+        {
+          return false;
+        }
+        setStartSeq(startSeq + 1);
       }
-
-      setStartSeq(startSeq + 1);
     }
     return true;
   }