X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;ds=inline;f=src%2Fjalview%2Fdatamodel%2FColumnSelection.java;h=98a7fe28b15d9d497984541fe31c96912cfacdcf;hb=2e18e422cead591bd9a1df295f1897b3e346a480;hp=c467f4ad103d7634b9f997d78ba3e1d9f28ab229;hpb=b4be31307e3a1e6d3dbb43bd14dfd012be6a3dfd;p=jalview.git

diff --git a/src/jalview/datamodel/ColumnSelection.java b/src/jalview/datamodel/ColumnSelection.java
index c467f4a..98a7fe2 100644
--- a/src/jalview/datamodel/ColumnSelection.java
+++ b/src/jalview/datamodel/ColumnSelection.java
@@ -1831,4 +1831,55 @@ public class ColumnSelection
     return changed;
   }
 
+  /**
+   * Adjusts column selections, and the given selection group, to match the
+   * range of a stretch (e.g. mouse drag) operation
+   * <p>
+   * Method refactored from ScalePanel.mouseDragged
+   * 
+   * @param res
+   *          current column position, adjusted for hidden columns
+   * @param sg
+   *          current selection group
+   * @param min
+   *          start position of the stretch group
+   * @param max
+   *          end position of the stretch group
+   */
+  public void stretchGroup(int res, SequenceGroup sg, int min, int max)
+  {
+    if (!contains(res))
+    {
+      addElement(res);
+    }
+
+    if (res > sg.getStartRes())
+    {
+      // expand selection group to the right
+      sg.setEndRes(res);
+    }
+    if (res < sg.getStartRes())
+    {
+      // expand selection group to the left
+      sg.setStartRes(res);
+    }
+
+    /*
+     * expand or shrink column selection to match the
+     * range of the drag operation
+     */
+    for (int col = min; col <= max; col++)
+    {
+      if (col < sg.getStartRes() || col > sg.getEndRes())
+      {
+        // shrinking drag - remove from selection
+        removeElement(col);
+      }
+      else
+      {
+        // expanding drag - add to selection
+        addElement(col);
+      }
+    }
+  }
 }