X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=test%2Fjalview%2Fviewmodel%2FViewportRangesTest.java;h=c0cb4ba8473c62408ba4a2f79d765a384b715735;hb=06de78be50c3934158fa1d35ec92ad86b54e959f;hp=851b1b7173961e3f7af3fbbf224a2a85ae961663;hpb=9c5be75e5630d56a4aed31874e9e8bd30fb0fd9e;p=jalview.git

diff --git a/test/jalview/viewmodel/ViewportRangesTest.java b/test/jalview/viewmodel/ViewportRangesTest.java
index 851b1b7..c0cb4ba 100644
--- a/test/jalview/viewmodel/ViewportRangesTest.java
+++ b/test/jalview/viewmodel/ViewportRangesTest.java
@@ -763,6 +763,66 @@ public class ViewportRangesTest {
       }
     }
   }
+
+  @Test(groups = { "Functional" })
+  public void testScrollUp_wrapped()
+  {
+    /*
+     * alignment 30 tall and 45 wide
+     */
+    AlignmentI al2 = gen.generate(45, 30, 1, 0, 5);
+
+    /*
+     * wrapped view, 5 sequences high, start at sequence offset 1
+     */
+    ViewportRanges vr = new ViewportRanges(al2);
+    vr.setWrappedMode(true);
+    vr.setViewportStartAndHeight(1, 5);
+
+    /*
+     * offset wrapped view to column 3
+     */
+    vr.setStartEndRes(3, 22);
+
+    int startRes = vr.getStartRes();
+    int width = vr.getViewportWidth();
+    assertEquals(startRes, 3);
+    assertEquals(width, 20);
+
+    // in wrapped mode, we change startRes but not startSeq
+    // scroll down:
+    vr.scrollUp(false);
+    assertEquals(vr.getStartSeq(), 1);
+    assertEquals(vr.getStartRes(), 23);
+
+    // scroll up returns to original position
+    vr.scrollUp(true);
+    assertEquals(vr.getStartSeq(), 1);
+    assertEquals(vr.getStartRes(), 3);
+
+    // scroll up again returns to 'origin'
+    vr.scrollUp(true);
+    assertEquals(vr.getStartSeq(), 1);
+    assertEquals(vr.getStartRes(), 0);
+
+    /*
+     * offset 3 columns once more and do some scroll downs
+     */
+    vr.setStartEndRes(3, 22);
+    vr.scrollUp(false);
+    assertEquals(vr.getStartSeq(), 1);
+    assertEquals(vr.getStartRes(), 23);
+    vr.scrollUp(false);
+    assertEquals(vr.getStartSeq(), 1);
+    assertEquals(vr.getStartRes(), 43);
+
+    /*
+     * scroll down beyond end of alignment does nothing
+     */
+    vr.scrollUp(false);
+    assertEquals(vr.getStartSeq(), 1);
+    assertEquals(vr.getStartRes(), 43);
+  }
 }
 
 // mock listener for property change events