header updated
[jalview.git] / src / jalview / gui / SeqPanel.java
index 2fe27b3..b1895ef 100755 (executable)
@@ -1,6 +1,6 @@
 /*\r
  * Jalview - A Sequence Alignment Editor and Viewer\r
- * Copyright (C) 2005 AM Waterhouse, J Procter, G Barton, M Clamp, S Searle\r
+ * Copyright (C) 2006 AM Waterhouse, J Procter, G Barton, M Clamp, S Searle\r
  *\r
  * This program is free software; you can redistribute it and/or\r
  * modify it under the terms of the GNU General Public License\r
@@ -27,6 +27,8 @@ import java.awt.event.*;
 \r
 import javax.swing.*;\r
 \r
+import java.util.Vector;\r
+\r
 \r
 /**\r
  * DOCUMENT ME!\r
@@ -45,8 +47,6 @@ public class SeqPanel extends JPanel implements MouseListener,
     public AlignmentPanel ap;\r
     protected int lastres;\r
     protected int startseq;\r
-    int startEdit = -1;\r
-    int endEdit = -1;\r
     protected AlignViewport av;\r
 \r
     // if character is inserted or deleted, we will need to recalculate the conservation\r
@@ -67,7 +67,12 @@ public class SeqPanel extends JPanel implements MouseListener,
     SequenceGroup stretchGroup = null;\r
     boolean remove = false;\r
 \r
+    Point lastMousePress;\r
     boolean mouseWheelPressed = false;\r
+    StringBuffer keyboardNo1;\r
+    StringBuffer keyboardNo2;\r
+\r
+    java.net.URL linkImageURL;\r
 \r
     /**\r
      * Creates a new SeqPanel object.\r
@@ -77,6 +82,7 @@ public class SeqPanel extends JPanel implements MouseListener,
      */\r
     public SeqPanel(AlignViewport avp, AlignmentPanel p)\r
     {\r
+        linkImageURL = getClass().getResource("/images/link.gif");\r
         ToolTipManager.sharedInstance().registerComponent(this);\r
         ToolTipManager.sharedInstance().setInitialDelay(0);\r
         ToolTipManager.sharedInstance().setDismissDelay(10000);\r
@@ -141,7 +147,6 @@ public class SeqPanel extends JPanel implements MouseListener,
 \r
    int findSeq(MouseEvent evt)\r
    {\r
-\r
      int seq = 0;\r
      int y = evt.getY();\r
 \r
@@ -156,16 +161,41 @@ public class SeqPanel extends JPanel implements MouseListener,
 \r
          y -= hgap;\r
 \r
-       seq = ( (y % cHeight) / av.getCharHeight());\r
+       seq = Math.min( (y % cHeight) / av.getCharHeight(),\r
+                       av.alignment.getHeight() -1);\r
      }\r
      else\r
      {\r
-       seq = (y / av.getCharHeight()) + av.getStartSeq();\r
+       seq = Math.min( (y / av.getCharHeight()) + av.getStartSeq(),\r
+                       av.alignment.getHeight() -1);\r
      }\r
 \r
      return seq;\r
    }\r
 \r
+   Vector getAllFeaturesAtRes(SequenceI seq, int res)\r
+   {\r
+     Vector allFeatures = new Vector();\r
+     int index = 0;\r
+     if(seq.getSequenceFeatures()!=null && av.featuresDisplayed!=null)\r
+     {\r
+       while (index < seq.getSequenceFeatures().length)\r
+       {\r
+         SequenceFeature sf = seq.getSequenceFeatures()[index];\r
+         if (sf.getBegin() <= res &&\r
+             sf.getEnd() >= res)\r
+         {\r
+           if (av.featuresDisplayed.containsKey(sf.getType()))\r
+           {\r
+             allFeatures.addElement(sf);\r
+           }\r
+         }\r
+         index++;\r
+       }\r
+     }\r
+     return allFeatures;\r
+  }\r
+\r
    void endEditing()\r
    {\r
      startseq = -1;\r
@@ -173,8 +203,211 @@ public class SeqPanel extends JPanel implements MouseListener,
      seqEditOccurred = false;\r
      editingSeqs = false;\r
      groupEditing = false;\r
+     keyboardNo1 = null;\r
+     keyboardNo2 = null;\r
+    }\r
+\r
+    void setCursorRow()\r
+    {\r
+      seqCanvas.cursorY = getKeyboardNo(keyboardNo1)-1;\r
+      scrollToVisible();\r
     }\r
 \r
+    void setCursorColumn()\r
+    {\r
+      seqCanvas.cursorX = getKeyboardNo(keyboardNo1)-1;\r
+      scrollToVisible();\r
+    }\r
+\r
+    void setCursorRowAndColumn()\r
+    {\r
+      if(keyboardNo2==null)\r
+      {\r
+        keyboardNo2 = new StringBuffer();\r
+      }\r
+      else\r
+      {\r
+        seqCanvas.cursorX = getKeyboardNo(keyboardNo1) - 1;\r
+        seqCanvas.cursorY = getKeyboardNo(keyboardNo2) - 1;\r
+        scrollToVisible();\r
+      }\r
+    }\r
+\r
+    void setCursorPosition()\r
+    {\r
+      SequenceI sequence =\r
+          (Sequence) av.getAlignment().getSequenceAt(seqCanvas.cursorY);\r
+\r
+      seqCanvas.cursorX = sequence.findIndex(\r
+          getKeyboardNo(keyboardNo1)-1\r
+          );\r
+      scrollToVisible();\r
+    }\r
+\r
+    void moveCursor(int dx, int dy)\r
+    {\r
+      seqCanvas.cursorX += dx;\r
+      seqCanvas.cursorY += dy;\r
+      scrollToVisible();\r
+    }\r
+\r
+    void scrollToVisible()\r
+    {\r
+      if (seqCanvas.cursorX < 0)\r
+        seqCanvas.cursorX = 0;\r
+      else if (seqCanvas.cursorX > av.alignment.getWidth() - 1)\r
+        seqCanvas.cursorX = av.alignment.getWidth() - 1;\r
+\r
+      if (seqCanvas.cursorY < 0)\r
+        seqCanvas.cursorY = 0;\r
+      else if (seqCanvas.cursorY > av.alignment.getHeight() - 1)\r
+        seqCanvas.cursorY = av.alignment.getHeight() - 1;\r
+\r
+\r
+      endEditing();\r
+      if(av.wrapAlignment)\r
+      {\r
+        ap.scrollToWrappedVisible(seqCanvas.cursorX);\r
+      }\r
+      else\r
+      {\r
+        while (seqCanvas.cursorY < av.startSeq)\r
+        {\r
+          ap.scrollUp(true);\r
+        }\r
+        while (seqCanvas.cursorY + 1 > av.endSeq)\r
+        {\r
+          ap.scrollUp(false);\r
+        }\r
+        if (!av.wrapAlignment)\r
+        {\r
+          while (seqCanvas.cursorX < av.startRes)\r
+          {\r
+            if (!ap.scrollRight(false))\r
+              break;\r
+          }\r
+          while (seqCanvas.cursorX > av.endRes)\r
+          {\r
+            if (!ap.scrollRight(true))\r
+              break;\r
+          }\r
+        }\r
+      }\r
+      setStatusMessage(av.alignment.getSequenceAt(seqCanvas.cursorY),\r
+                       seqCanvas.cursorX, seqCanvas.cursorY);\r
+\r
+      seqCanvas.repaint();\r
+    }\r
+\r
+    void setSelectionAreaAtCursor(boolean topLeft)\r
+    {\r
+      SequenceI sequence =\r
+          (Sequence) av.getAlignment().getSequenceAt(seqCanvas.cursorY);\r
+\r
+      if(av.getSelectionGroup()!=null)\r
+      {\r
+        SequenceGroup sg = av.selectionGroup;\r
+        //Find the top and bottom of this group\r
+        int min = av.alignment.getHeight(), max = 0;\r
+        for(int i=0; i<sg.getSize(false); i++)\r
+        {\r
+          int index = av.alignment.findIndex( sg.getSequenceAt(i) );\r
+          if(index > max)\r
+            max = index;\r
+          if(index < min)\r
+            min = index;\r
+        }\r
+\r
+        max ++;\r
+\r
+        if(topLeft)\r
+        {\r
+          sg.setStartRes(seqCanvas.cursorX);\r
+          if(sg.getEndRes()<seqCanvas.cursorX)\r
+            sg.setEndRes(seqCanvas.cursorX);\r
+\r
+          min = seqCanvas.cursorY;\r
+        }\r
+        else\r
+        {\r
+          sg.setEndRes(seqCanvas.cursorX);\r
+          if(sg.getStartRes()>seqCanvas.cursorX)\r
+            sg.setStartRes(seqCanvas.cursorX);\r
+\r
+          max = seqCanvas.cursorY+1;\r
+        }\r
+\r
+        if(min>max)\r
+        {\r
+          // Only the user can do this\r
+          av.setSelectionGroup(null);\r
+        }\r
+        else\r
+        {\r
+          // Now add any sequences between min and max\r
+          sg.getSequences(false).clear();\r
+          for (int i = min; i < max; i++)\r
+          {\r
+            sg.addSequence(av.alignment.getSequenceAt(i), false);\r
+          }\r
+        }\r
+      }\r
+\r
+      if (av.getSelectionGroup() == null)\r
+      {\r
+        SequenceGroup sg = new SequenceGroup();\r
+        sg.setStartRes(seqCanvas.cursorX);\r
+        sg.setEndRes(seqCanvas.cursorX);\r
+        sg.addSequence(sequence, false);\r
+        av.setSelectionGroup(sg);\r
+      }\r
+\r
+\r
+      ap.repaint();\r
+    }\r
+\r
+    void insertGapAtCursor(boolean group)\r
+    {\r
+      ap.alignFrame.addHistoryItem(new HistoryItem("Edit Sequence",\r
+                                                   av.alignment, HistoryItem.EDIT));\r
+      groupEditing = group;\r
+      startseq = seqCanvas.cursorY;\r
+      lastres = seqCanvas.cursorX;\r
+      editSequence(true, seqCanvas.cursorX+getKeyboardNo(keyboardNo1));\r
+      editOccurred();\r
+    }\r
+\r
+    void deleteGapAtCursor(boolean group)\r
+    {\r
+      ap.alignFrame.addHistoryItem(new HistoryItem("Edit Sequence",\r
+                                                   av.alignment, HistoryItem.EDIT));\r
+      groupEditing = group;\r
+      startseq = seqCanvas.cursorY;\r
+      lastres = seqCanvas.cursorX+getKeyboardNo(keyboardNo1);\r
+      editSequence(false, seqCanvas.cursorX);\r
+      editOccurred();\r
+    }\r
+\r
+    void numberPressed(char value)\r
+    {\r
+      if(keyboardNo1==null)\r
+        keyboardNo1 = new StringBuffer();\r
+\r
+      if(keyboardNo2!=null)\r
+        keyboardNo2.append(value);\r
+      else\r
+        keyboardNo1.append(value);\r
+    }\r
+\r
+    int getKeyboardNo(StringBuffer kb)\r
+    {\r
+      if(kb==null)\r
+        return 1;\r
+      else\r
+        return Integer.parseInt(kb.toString());\r
+    }\r
+\r
+\r
     /**\r
      * DOCUMENT ME!\r
      *\r
@@ -183,6 +416,7 @@ public class SeqPanel extends JPanel implements MouseListener,
     public void mouseReleased(MouseEvent evt)\r
     {\r
       mouseDragging = false;\r
+      mouseWheelPressed = false;\r
 \r
       if (!editingSeqs)\r
       {\r
@@ -190,13 +424,9 @@ public class SeqPanel extends JPanel implements MouseListener,
          return;\r
       }\r
 \r
-        if (seqEditOccurred)\r
-        {\r
-            editOccurred();\r
-        }\r
+       editOccurred();\r
 \r
-        endEditing();\r
-        ap.repaint();\r
+       ap.repaint();\r
     }\r
 \r
 \r
@@ -208,6 +438,8 @@ public class SeqPanel extends JPanel implements MouseListener,
      */\r
     public void mousePressed(MouseEvent evt)\r
     {\r
+      lastMousePress = evt.getPoint();\r
+\r
       if (javax.swing.SwingUtilities.isMiddleMouseButton(evt))\r
       {\r
         mouseWheelPressed = true;\r
@@ -230,8 +462,6 @@ public class SeqPanel extends JPanel implements MouseListener,
       }\r
 \r
 \r
-      ap.alignFrame.addHistoryItem(new HistoryItem("Edit Sequence",\r
-                                                   av.alignment, HistoryItem.EDIT));\r
 \r
       int seq = findSeq(evt);\r
       int res = findRes(evt);\r
@@ -239,6 +469,9 @@ public class SeqPanel extends JPanel implements MouseListener,
       if(seq<0 || res<0)\r
         return;\r
 \r
+      ap.alignFrame.addHistoryItem(new HistoryItem("Edit Sequence",\r
+                                                         av.alignment, HistoryItem.EDIT));\r
+\r
         if ((seq < av.getAlignment().getHeight()) &&\r
                 (res < av.getAlignment().getSequenceAt(seq).getLength()))\r
         {\r
@@ -251,9 +484,6 @@ public class SeqPanel extends JPanel implements MouseListener,
             lastres = -1;\r
         }\r
 \r
-        startEdit = lastres;\r
-        endEdit = lastres;\r
-\r
         return;\r
     }\r
 \r
@@ -274,6 +504,7 @@ public class SeqPanel extends JPanel implements MouseListener,
       int res = findRes(evt);\r
       int seq = findSeq(evt);\r
 \r
+\r
       if(res<0 || seq<0 || seq >= av.getAlignment().getHeight())\r
             return;\r
 \r
@@ -289,36 +520,7 @@ public class SeqPanel extends JPanel implements MouseListener,
         seqCanvas.pdbCanvas.highlightRes(sequence.findPosition(res));\r
       }\r
 \r
-\r
-        StringBuffer text = new StringBuffer("Sequence " + (seq + 1) + " ID: " +\r
-                sequence.getName());\r
-\r
-        Object obj = null;\r
-        if (av.alignment.isNucleotide())\r
-        {\r
-          obj = ResidueProperties.nucleotideName.get(sequence.getCharAt(res) +\r
-              "");\r
-          if(obj!=null)\r
-            text.append(" Nucleotide: ");\r
-        }\r
-        else\r
-        {\r
-          obj = ResidueProperties.aa2Triplet.get(sequence.getCharAt(res) + "");\r
-          if(obj!=null)\r
-            text.append("  Residue: ");\r
-        }\r
-\r
-        if (obj != null)\r
-        {\r
-\r
-          if (obj != "")\r
-          {\r
-            text.append( obj + " (" +\r
-                        av.getAlignment().getSequenceAt(seq).findPosition(res) + ")");\r
-          }\r
-        }\r
-\r
-        ap.alignFrame.statusBar.setText(text.toString());\r
+      setStatusMessage(sequence, res, seq);\r
 \r
         // use aa to see if the mouse pointer is on a\r
         if (av.showSequenceFeatures)\r
@@ -327,6 +529,7 @@ public class SeqPanel extends JPanel implements MouseListener,
             if(features!=null)\r
             {\r
               StringBuffer sbuffer = new StringBuffer("<html>");\r
+              StringBuffer seqSpecific =  new StringBuffer();\r
 \r
               for (int i = 0; i < features.length; i++)\r
               {\r
@@ -334,7 +537,8 @@ public class SeqPanel extends JPanel implements MouseListener,
                 if ( (features[i].getBegin() <= sequence.findPosition(res)) &&\r
                     (features[i].getEnd() >= sequence.findPosition(res)))\r
                 {\r
-                  if(!av.featuresDisplayed.containsKey(features[i].getType()))\r
+                  if(av.featuresDisplayed==null\r
+                    || !av.featuresDisplayed.containsKey(features[i].getType()))\r
                   continue;\r
 \r
 \r
@@ -347,30 +551,46 @@ public class SeqPanel extends JPanel implements MouseListener,
                         sbuffer.append("<br>");\r
                       sbuffer.append("disulfide bond " + features[i].getBegin() + ":" +\r
                                      features[i].getEnd());\r
+                      if (features[i].links != null)\r
+                      sbuffer.append(" <img src=\"" + linkImageURL + "\">");\r
                     }\r
                   }\r
                   else\r
                   {\r
                     if (sbuffer.length() > 6)\r
                       sbuffer.append("<br>");\r
-                    if(features[i].featureGroup!=null)\r
-                      sbuffer.append(features[i].featureGroup+";");\r
 \r
-                    sbuffer.append(features[i].getType());\r
+                    sbuffer.append(features[i].getType() + " " +\r
+                                   features[i].begin);\r
+                    if (features[i].begin != features[i].end)\r
+                      sbuffer.append(" " + features[i].end);\r
 \r
                     if (features[i].getDescription() != null\r
                         && !features[i].description.equals(features[i].getType()))\r
                       sbuffer.append("; " + features[i].getDescription());\r
 \r
-                    if (features[i].getStatus() != null && features[i].getStatus().length()>0)\r
+                    if (features[i].getValue("status") != null)\r
                     {\r
-                      sbuffer.append("; (" + features[i].getStatus() + ")");\r
+                      sbuffer.append("; (" + features[i].getValue("status") + ")");\r
                     }\r
+                    if (features[i].links != null)\r
+                      sbuffer.append(" <img src=\"" + linkImageURL + "\">");\r
+\r
                   }\r
                 }\r
+                else if(features[i].begin==0 && features[i].end==0)\r
+                {\r
+                  // seqSpecific.append(features[i].featureGroup+": "\r
+                  //                   + features[i].getType()+" "\r
+                   //                   +features[i].getDescription()+"<br>");\r
 \r
+                }\r
               }\r
 \r
+              if(seqSpecific.length()>0)\r
+                seqSpecific.setLength(seqSpecific.length()-4);\r
+\r
+              sbuffer.append(seqSpecific);\r
               sbuffer.append("</html>");\r
               if(sbuffer.length()==13) // <html></html>\r
                 setToolTipText("");\r
@@ -382,6 +602,39 @@ public class SeqPanel extends JPanel implements MouseListener,
         }\r
     }\r
 \r
+    void setStatusMessage(SequenceI sequence, int res, int seq)\r
+    {\r
+      StringBuffer text = new StringBuffer("Sequence " + (seq + 1) + " ID: " +\r
+                                           sequence.getName());\r
+\r
+      Object obj = null;\r
+      if (av.alignment.isNucleotide())\r
+      {\r
+        obj = ResidueProperties.nucleotideName.get(sequence.getCharAt(res) +\r
+                                                   "");\r
+        if (obj != null)\r
+          text.append(" Nucleotide: ");\r
+      }\r
+      else\r
+      {\r
+        obj = ResidueProperties.aa2Triplet.get(sequence.getCharAt(res) + "");\r
+        if (obj != null)\r
+          text.append("  Residue: ");\r
+      }\r
+\r
+      if (obj != null)\r
+      {\r
+\r
+        if (obj != "")\r
+        {\r
+          text.append(obj + " (" + sequence.findPosition(res) +\r
+                      ")");\r
+        }\r
+      }\r
+      ap.alignFrame.statusBar.setText(text.toString());\r
+\r
+    }\r
+\r
     /**\r
      * DOCUMENT ME!\r
      *\r
@@ -389,6 +642,54 @@ public class SeqPanel extends JPanel implements MouseListener,
      */\r
     public void mouseDragged(MouseEvent evt)\r
     {\r
+      if (mouseWheelPressed)\r
+      {\r
+        int oldWidth = av.charWidth;\r
+\r
+        //Which is bigger, left-right or up-down?\r
+        if (Math.abs(evt.getY() - lastMousePress.getY())\r
+            > Math.abs(evt.getX() - lastMousePress.getX()))\r
+        {\r
+          int fontSize = av.font.getSize();\r
+\r
+          if (evt.getY() < lastMousePress.getY())\r
+          {\r
+            fontSize--;\r
+          }\r
+          else if (evt.getY() > lastMousePress.getY())\r
+          {\r
+            fontSize++;\r
+          }\r
+\r
+          if(fontSize<1)\r
+            fontSize = 1;\r
+\r
+          av.setFont(new Font(av.font.getName(), av.font.getStyle(), fontSize));\r
+          av.charWidth = oldWidth;\r
+          ap.fontChanged();\r
+        }\r
+        else\r
+        {\r
+          if (evt.getX() < lastMousePress.getX() && av.charWidth > 1)\r
+          {\r
+            av.charWidth--;\r
+          }\r
+          else if (evt.getX() > lastMousePress.getX())\r
+          {\r
+            av.charWidth++;\r
+          }\r
+\r
+          ap.repaint();\r
+        }\r
+\r
+        FontMetrics fm = getFontMetrics(av.getFont());\r
+        av.validCharWidth = fm.charWidth('M') <= av.charWidth;\r
+\r
+        lastMousePress = evt.getPoint();\r
+\r
+        return;\r
+      }\r
+\r
       if (!editingSeqs)\r
       {\r
         doMouseDraggedDefineMode(evt);\r
@@ -407,240 +708,381 @@ public class SeqPanel extends JPanel implements MouseListener,
             return;\r
         }\r
 \r
-        boolean dragRight = true;\r
-\r
-        if ((res < av.getAlignment().getWidth()) && (res < lastres))\r
+        if ( (res < av.getAlignment().getWidth()) && (res < lastres))\r
         {\r
-            dragRight = false;\r
+          // dragLeft, delete gap\r
+          editSequence(false, res);\r
         }\r
-        else if(av.hasHiddenColumns)\r
+        else\r
+          editSequence(true, res);\r
+\r
+        mouseDragging = true;\r
+        if(scrollThread!=null)\r
+          scrollThread.setEvent(evt);\r
+\r
+    }\r
+\r
+    synchronized void editSequence(boolean insertGap, int startres)\r
+    {\r
+      int fixedLeft = -1;\r
+      int fixedRight = -1;\r
+      boolean fixedColumns = false;\r
+      SequenceGroup sg = av.getSelectionGroup();\r
+\r
+\r
+        if (!groupEditing && av.hasHiddenRows)\r
         {\r
-          //Stop editing if the user has dragged beyond hiddenBoundary\r
-          int lastCol = av.getColumnSelection().getHiddenRegionBoundary(lastres);\r
-          if( lastCol < res)\r
+          if (av.alignment.getSequenceAt(startseq).getHiddenSequences() != null)\r
           {\r
-            if(lastres!=lastCol)\r
-            {\r
-              endEditing();\r
-              return;\r
-            }\r
+            groupEditing = true;\r
           }\r
         }\r
 \r
-        if(!groupEditing && av.hasHiddenRows)\r
+        //No group, but the sequence may represent a group\r
+        if (groupEditing\r
+            && sg == null\r
+            && av.alignment.getSequenceAt(startseq).getHiddenSequences() == null)\r
+        {\r
+          groupEditing = false;\r
+        }\r
+\r
+        SequenceI seq = av.alignment.getSequenceAt(startseq);\r
+        StringBuffer message = new StringBuffer();\r
+        if (groupEditing)\r
+           message.append("Edit group:");\r
+        else\r
+           message.append("Edit sequence: "+seq.getName());\r
+\r
+       if(insertGap)\r
+         message.append(" insert ");\r
+       else\r
+         message.append(" delete ");\r
+\r
+       message.append(Math.abs(startres-lastres)+" gaps.");\r
+       ap.alignFrame.statusBar.setText(message.toString());\r
+\r
+\r
+        //Are we editing within a selection group?\r
+        if (groupEditing\r
+            || (sg != null && sg.getSequences(true).contains(seq)))\r
         {\r
-          if(av.alignment.getSequenceAt(startseq).getHiddenSequences()!=null)\r
+          fixedColumns = true;\r
+\r
+          //sg might be null as the user may only see 1 sequence,\r
+          //but the sequence represents a group\r
+          if (sg == null)\r
           {\r
-            groupEditing = true;\r
+            sg = new SequenceGroup(null, null, false, false, false, 0,\r
+                                   av.alignment.getWidth()-1);\r
+            sg.addSequence(av.alignment.getSequenceAt(startseq), false);\r
+          }\r
+\r
+          fixedLeft = sg.getStartRes();\r
+          fixedRight = sg.getEndRes();\r
+\r
+          if (   (startres < fixedLeft && lastres >= fixedLeft)\r
+              || (startres >= fixedLeft && lastres < fixedLeft)\r
+              || (startres > fixedRight && lastres <=fixedRight)\r
+              || (startres <= fixedRight && lastres > fixedRight))\r
+          {\r
+            endEditing();\r
+            return;\r
+          }\r
+\r
+          if (fixedLeft > startres)\r
+          {\r
+            fixedRight = fixedLeft - 1;\r
+            fixedLeft = 0;\r
+          }\r
+          else if (fixedRight < startres)\r
+          {\r
+            fixedLeft = fixedRight;\r
+            fixedRight = -1;\r
           }\r
         }\r
 \r
 \r
-        if (res != lastres)\r
+        if(av.hasHiddenColumns )\r
         {\r
-            SequenceI seq;\r
-            // Group editing\r
-            if (groupEditing)\r
+            fixedColumns = true;\r
+            int y1 = av.getColumnSelection().getHiddenBoundaryLeft(startres);\r
+            int y2 = av.getColumnSelection().getHiddenBoundaryRight(startres);\r
+\r
+            if ( (insertGap && startres > y1 && lastres < y1)\r
+                || (!insertGap && startres < y2 && lastres > y2))\r
             {\r
-                SequenceGroup sg = av.getSelectionGroup();\r
+              endEditing();\r
+              return;\r
+            }\r
+\r
+            //System.out.print(y1+" "+y2+" "+fixedLeft+" "+fixedRight+"~~");\r
+            //Selection spans a hidden region\r
+            if(fixedLeft<y1 && (fixedRight>y2 || fixedRight==-1))\r
+            {\r
+              if(startres>=y2)\r
+              {\r
+                fixedLeft = y2;\r
+              }\r
+              else\r
+              {\r
+               fixedRight = y2 - 1;\r
+             }\r
+            }\r
+        }\r
 \r
-                if (av.hasHiddenRows)\r
-                {\r
-                  //sg might be null as the user may only see 1 sequence\r
-                  if(sg==null)\r
-                  {\r
-                    sg = new SequenceGroup();\r
-                    sg.addSequence(av.alignment.getSequenceAt(startseq), false);\r
-                  }\r
 \r
-                  SequenceGroup tmp = new SequenceGroup();\r
+        if (groupEditing)\r
+        {\r
+          // drag to right\r
+          if (insertGap)\r
+          {\r
+              //If the user has selected the whole sequence, and is dragging to\r
+              // the right, we can still extend the alignment and selectionGroup\r
+              if(   sg.getStartRes() == 0\r
+                    && sg.getEndRes() == fixedRight\r
+                    && sg.getEndRes() == av.alignment.getWidth()-1\r
+                 )\r
+              {\r
+                sg.setEndRes(av.alignment.getWidth() + startres - lastres);\r
+                fixedRight = sg.getEndRes();\r
+              }\r
 \r
-                  //Do any of the sequences have hidden associates?\r
-                  for (int s = 0; s < sg.getSize(); s++)\r
+            // Is it valid with fixed columns??\r
+            // Find the next gap before the end\r
+            // of the visible region boundary\r
+            boolean blank = false;\r
+            for (fixedRight = fixedRight;\r
+                 fixedRight > lastres;\r
+                 fixedRight--)\r
+            {\r
+              blank = true;\r
+              for (int s = 0; s < sg.getSize(true); s++)\r
+              {\r
+                seq = (SequenceI)sg.getSequences(true).elementAt(s);\r
+                for (int j = 0; j < startres - lastres; j++)\r
+                {\r
+                  if (!jalview.util.Comparison.isGap(\r
+                      seq.getCharAt(fixedRight - j)))\r
                   {\r
-                    seq = sg.getSequenceAt(s);\r
-                    tmp.addSequence(seq, false);\r
-                    if (seq.getHiddenSequences()!=null)\r
-                    {\r
-                      for(int h=0; h<seq.getHiddenSequences().getSize(); h++)\r
-                        tmp.addSequence(seq.getHiddenSequences().getSequenceAt(h),\r
-                                        false);\r
-                    }\r
+                    blank = false;\r
+                    break;\r
                   }\r
-\r
-                  sg = tmp;\r
                 }\r
+              }\r
+              if (blank)\r
+                break;\r
+            }\r
 \r
-\r
-                if (sg == null)\r
+            if (!blank)\r
+            {\r
+              if(sg.getSize(false) == av.alignment.getHeight()  )\r
+              {\r
+                if((av.hasHiddenColumns\r
+                    && startres<av.getColumnSelection().getHiddenBoundaryRight(startres)))\r
                 {\r
-                    endEditing();\r
-                    return;\r
+                  endEditing();\r
+                  return;\r
                 }\r
 \r
-                int blankColumn = -1;\r
-\r
-                // drag to right\r
-                if (dragRight)\r
+                int alWidth = av.alignment.getWidth();\r
+                if(av.hasHiddenRows)\r
                 {\r
+                  int hwidth = av.alignment.getHiddenSequences().getWidth();\r
+                  if(hwidth>alWidth)\r
+                    alWidth = hwidth;\r
+                }\r
+                //We can still insert gaps if the selectionGroup\r
+                //contains all the sequences\r
+                sg.setEndRes(sg.getEndRes()+startres-lastres);\r
+                fixedRight = alWidth+startres-lastres;\r
+              }\r
+              else\r
+              {\r
+                endEditing();\r
+                return;\r
+              }\r
+            }\r
+          }\r
 \r
-                  // Is it valid??\r
-                  // Find the next gap before the end\r
-                  // of the visible region boundary\r
-                  if (av.hasHiddenColumns)\r
-                  {\r
-                    if(res-lastres > 1)\r
-                    {\r
-                      res = lastres+1;\r
-                    }\r
-\r
-\r
-                    int lastCol = av.getColumnSelection().\r
-                          getHiddenRegionBoundary(res);\r
 \r
-                    if(lastCol!=res)\r
-                    {\r
-                      for (blankColumn = lastCol;\r
-                           blankColumn > lastres;\r
-                           blankColumn--)\r
-                      {\r
-                        boolean blank = true;\r
-                        for (int s = 0; s < sg.getSize(); s++)\r
-                        {\r
-                          seq = sg.getSequenceAt(s);\r
-\r
-                          if (seq.getSequence().length() <= blankColumn)\r
-                          {\r
-                            continue;\r
-                          }\r
-\r
-                          if (!jalview.util.Comparison.isGap(\r
-                              seq.getSequence().charAt(blankColumn)))\r
-                          {\r
-                            blank = false;\r
-                            continue;\r
-                          }\r
-                        }\r
-                        if (blank)\r
-                          break;\r
-                      }\r
-\r
-\r
-                      if (blankColumn <= lastres)\r
-                      {\r
-                        endEditing();\r
-                        return;\r
-                      }\r
-                    }\r
-                    else\r
-                      blankColumn = -1;\r
+          // drag to left\r
+          else if(!insertGap)\r
+          {\r
+            /// Are we able to delete?\r
+            // ie are all columns blank?\r
 \r
-                  }\r
+            for (int s = 0; s < sg.getSize(true); s++)\r
+            {\r
+              seq = (SequenceI)sg.getSequences(true).elementAt(s);\r
 \r
-                  sg.setEndRes(sg.getEndRes() + (res - lastres));\r
+              for (int j = startres; j < lastres; j++)\r
+              {\r
+                if (seq.getSequence().length() <= j)\r
+                {\r
+                  continue;\r
                 }\r
 \r
-                // drag to left\r
-                else\r
+                if (!jalview.util.Comparison.isGap(\r
+                    seq.getSequence().charAt(j)))\r
                 {\r
-                    /// Are we able to delete?\r
-                    // ie are all columns blank?\r
-\r
-                    for (int s = 0; s < sg.getSize(); s++)\r
-                    {\r
-                        seq = sg.getSequenceAt(s);\r
-\r
-                        for (int j = res; j < lastres; j++)\r
-                        {\r
-                            if (seq.getSequence().length() <= j)\r
-                            {\r
-                                continue;\r
-                            }\r
-\r
-                            if (!jalview.util.Comparison.isGap(\r
-                                        seq.getSequence().charAt(j)))\r
-                            {\r
-                                // Not a gap, block edit not valid\r
-                                endEditing();\r
-                                return;\r
-                            }\r
-                        }\r
-                    }\r
-\r
-                    if(res<sg.getStartRes())\r
-                    {\r
-                      sg.setStartRes(sg.getStartRes() - 1);\r
-                    }\r
-                    sg.setEndRes(sg.getEndRes() - (lastres - res));\r
+                  // Not a gap, block edit not valid\r
+                  endEditing();\r
+                  return;\r
                 }\r
+              }\r
+            }\r
+          }\r
 \r
-                for (int i = 0; i < sg.getSize(); i++)\r
-                {\r
-                    seq = sg.getSequenceAt(i);\r
 \r
-                    // drag to right\r
-                    if (dragRight)\r
-                    {\r
-                        for (int j = lastres; j < res; j++)\r
-                        {\r
-                            insertChar(j, seq, blankColumn);\r
-                        }\r
-                    }\r
+          for (int i = 0; i < sg.getSize(true); i++)\r
+          {\r
+            seq = (SequenceI) sg.getSequences(true).elementAt(i);\r
 \r
-                    // drag to left\r
-                    else\r
-                    {\r
-                        for (int j = res; j < lastres; j++)\r
-                        {\r
-                            if (seq.getLength()-1 > res)\r
-                            {\r
-                                deleteChar(res, seq);\r
-                            }\r
-                        }\r
-                    }\r
+            if (insertGap)\r
+            {\r
+              // dragging to the right\r
+              for (int j = lastres; j < startres; j++)\r
+              {\r
+                if (fixedColumns && fixedRight != -1)\r
+                {\r
+                  insertChar(j, seq, fixedRight);\r
                 }\r
+                else\r
+                  insertChar(j, seq);\r
+              }\r
             }\r
-            else /////Editing a single sequence///////////\r
+            else\r
             {\r
-                seq = av.alignment.getSequenceAt(startseq);\r
-                if ((res < av.getAlignment().getWidth()) && (res > lastres))\r
+              // dragging to the left\r
+              for (int j = lastres; j > startres; j--)\r
+              {\r
+                if (fixedColumns && fixedRight != -1)\r
                 {\r
-                    // dragging to the right\r
-                    for (int j = lastres; j < res; j++)\r
-                    {\r
-                        insertChar(j, seq, j);\r
-                    }\r
+                  deleteChar(startres, seq, fixedRight);\r
                 }\r
-                else if ((res < av.getAlignment().getWidth()) &&\r
-                        (res < lastres))\r
+                else\r
                 {\r
-                    // dragging to the left\r
-                    for (int j = lastres; j > res; j--)\r
-                    {\r
-                        if (jalview.util.Comparison.isGap(\r
-                                    av.alignment.getSequenceAt(startseq)\r
-                                                    .getSequence().charAt(res)))\r
-                        {\r
-                            deleteChar(res, seq);\r
-                        }\r
-                        else\r
-                        {\r
-                            break;\r
-                        }\r
-                    }\r
+                  deleteChar(startres, seq);\r
                 }\r
+              }\r
             }\r
+          }\r
+        }\r
+        else /////Editing a single sequence///////////\r
+        {\r
+          if (insertGap)\r
+          {\r
+            // dragging to the right\r
+            for (int j = lastres; j < startres; j++)\r
+            {\r
+              if (fixedColumns && fixedRight != -1)\r
+              {\r
+                  insertChar(j, seq, fixedRight);\r
+              }\r
+              else\r
+                insertChar(j, seq);\r
+            }\r
+          }\r
+          else\r
+          {\r
+            // dragging to the left\r
+            for (int j = lastres; j > startres; j--)\r
+            {\r
+              if (fixedColumns && fixedRight != -1)\r
+              {\r
+                deleteChar(startres, seq, fixedRight);\r
+              }\r
+              else\r
+              {\r
+                deleteChar(startres, seq);\r
+              }\r
+            }\r
+          }\r
         }\r
 \r
-        mouseDragging = true;\r
-        if(scrollThread!=null)\r
-          scrollThread.setEvent(evt);\r
-\r
-        endEdit = res;\r
-        lastres = res;\r
+        lastres = startres;\r
         seqCanvas.repaint();\r
     }\r
 \r
+\r
+    /**\r
+     * DOCUMENT ME!\r
+     *\r
+     * @param j DOCUMENT ME!\r
+     * @param seq DOCUMENT ME!\r
+     */\r
+    void insertChar(int j, SequenceI seq)\r
+    {\r
+        seq.insertCharAt(j, av.getGapCharacter());\r
+        seqEditOccurred = true;\r
+    }\r
+\r
+    void insertChar(int j, SequenceI seq, int fixedColumn)\r
+    {\r
+      //Find the next gap before the end of the visible region boundary\r
+      //If lastCol > j, theres a boundary after the gap insertion\r
+      int blankColumn = fixedColumn;\r
+      for (blankColumn = fixedColumn; blankColumn > j; blankColumn--)\r
+      {\r
+        if (jalview.util.Comparison.isGap(seq.getCharAt(blankColumn)))\r
+        {\r
+          //Theres a space, so break and insert the gap\r
+          break;\r
+        }\r
+      }\r
+\r
+      if (blankColumn <= j)\r
+      {\r
+        blankColumn = fixedColumn;\r
+        endEditing();\r
+        return;\r
+      }\r
+\r
+      if (!jalview.util.Comparison.isGap(seq.getCharAt(blankColumn)))\r
+      {\r
+        //Just Checking\r
+        System.out.println("Tried removing residue (INSERT)"+seq.getCharAt(fixedColumn));\r
+        return;\r
+      }\r
+\r
+      seq.deleteCharAt(blankColumn);\r
+      seq.insertCharAt(j, av.getGapCharacter());\r
+      seqEditOccurred = true;\r
+    }\r
+\r
+    void deleteChar(int j, SequenceI seq, int fixedColumn)\r
+    {\r
+      if (!jalview.util.Comparison.isGap(seq.getCharAt(j)))\r
+      {\r
+        ap.alignFrame.statusBar.setText(\r
+            "End editing: Tried removing residue " + seq.getCharAt(j));\r
+        return;\r
+      }\r
+\r
+      seq.deleteCharAt(j);\r
+      seq.insertCharAt(fixedColumn, av.getGapCharacter());\r
+      seqEditOccurred = true;\r
+    }\r
+\r
+    /**\r
+     * DOCUMENT ME!\r
+     *\r
+     * @param j DOCUMENT ME!\r
+     * @param seq DOCUMENT ME!\r
+     */\r
+    void deleteChar(int j, SequenceI seq)\r
+    {\r
+      if (!jalview.util.Comparison.isGap(seq.getCharAt(j)))\r
+      {\r
+        ap.alignFrame.statusBar.setText(\r
+            "End editing: Tried removing residue " + seq.getCharAt(j));\r
+        return;\r
+      }\r
+\r
+        seq.deleteCharAt(j);\r
+        seqEditOccurred = true;\r
+        seqCanvas.repaint();\r
+    }\r
     /**\r
      * DOCUMENT ME!\r
      *\r
@@ -681,7 +1123,8 @@ public class SeqPanel extends JPanel implements MouseListener,
 \r
     public void mouseWheelMoved(MouseWheelEvent e)\r
     {\r
-      if (mouseWheelPressed)\r
+      e.consume();\r
+     /* if (mouseWheelPressed)\r
       {\r
         Font font = av.getFont();\r
         int fontSize = font.getSize();\r
@@ -690,10 +1133,13 @@ public class SeqPanel extends JPanel implements MouseListener,
         else if (fontSize > 1)\r
           fontSize--;\r
 \r
+\r
+\r
         av.setFont(new Font(font.getName(), font.getStyle(), fontSize));\r
+\r
         ap.fontChanged();\r
       }\r
-      else\r
+      else*/\r
       {\r
         if (e.getWheelRotation() > 0)\r
           ap.scrollUp(false);\r
@@ -704,78 +1150,6 @@ public class SeqPanel extends JPanel implements MouseListener,
     }\r
 \r
 \r
-    /**\r
-     * DOCUMENT ME!\r
-     *\r
-     * @param j DOCUMENT ME!\r
-     * @param seq DOCUMENT ME!\r
-     */\r
-    void insertChar(int j, SequenceI seq, int blankColumn)\r
-    {\r
-        if(av.hasHiddenColumns)\r
-        {\r
-          //Find the next gap before the end of the visible region boundary\r
-          int lastCol = av.getColumnSelection().getHiddenRegionBoundary(j);\r
-          if(lastCol != j)\r
-          {\r
-            if (!groupEditing || lastCol <= j)\r
-            {\r
-              blankColumn = lastCol;\r
-              //If lastCol > j, theres a boundary after the gap insertion\r
-              if (lastCol > j)\r
-              {\r
-                for (blankColumn = lastCol; blankColumn > j; blankColumn--)\r
-                {\r
-                  if (jalview.util.Comparison.isGap(seq.getCharAt(blankColumn)))\r
-                  {\r
-                    //Theres a space, so break and insert the gap\r
-                    break;\r
-                  }\r
-                }\r
-\r
-                if (blankColumn <= j)\r
-                {\r
-                  endEditing();\r
-                  return;\r
-                }\r
-              }\r
-\r
-            }\r
-\r
-            // Editing with hidden regions only!!\r
-            seq.deleteCharAt(blankColumn);\r
-          }\r
-      }\r
-\r
-        seq.insertCharAt(j, av.getGapCharacter());\r
-        seqEditOccurred = true;\r
-    }\r
-\r
-    /**\r
-     * DOCUMENT ME!\r
-     *\r
-     * @param j DOCUMENT ME!\r
-     * @param seq DOCUMENT ME!\r
-     */\r
-    public void deleteChar(int j, SequenceI seq)\r
-    {\r
-      if (av.hasHiddenColumns)\r
-      {\r
-        //Find the next gap before the end of the visible region boundary\r
-        int lastCol = av.getColumnSelection().getHiddenRegionBoundary(j);\r
-\r
-        //If lastCol > j, theres a boundary after the gap insertion\r
-        if (lastCol > j)\r
-        {\r
-          seq.insertCharAt(lastCol, av.getGapCharacter());\r
-        }\r
-      }\r
-\r
-        seq.deleteCharAt(j);\r
-        seqEditOccurred = true;\r
-\r
-        seqCanvas.repaint();\r
-    }\r
 \r
     /**\r
      * DOCUMENT ME!\r
@@ -784,12 +1158,14 @@ public class SeqPanel extends JPanel implements MouseListener,
      */\r
     void editOccurred()\r
     {\r
-      if (endEdit == startEdit)\r
+      if (!seqEditOccurred)\r
       {\r
         ap.alignFrame.historyList.pop();\r
         ap.alignFrame.updateEditMenuBar();\r
       }\r
 \r
+      endEditing();\r
+\r
       av.firePropertyChange("alignment", null,av.getAlignment().getSequences());\r
 \r
     }\r
@@ -813,13 +1189,12 @@ public class SeqPanel extends JPanel implements MouseListener,
               "Cannot edit annotations in wrapped view.",\r
               "Wrapped view - no edit",\r
               JOptionPane.WARNING_MESSAGE);\r
-        return;\r
+          return;\r
       }\r
 \r
       if(seq<0 || res<0)\r
             return;\r
 \r
-\r
         SequenceI sequence = (Sequence) av.getAlignment().getSequenceAt(seq);\r
 \r
         if ((sequence == null) || (res > sequence.getLength()))\r
@@ -843,7 +1218,7 @@ public class SeqPanel extends JPanel implements MouseListener,
                 stretchGroup = null;\r
             }\r
         }\r
-        else if (!stretchGroup.sequences.contains(sequence) ||\r
+        else if (!stretchGroup.getSequences(false).contains(sequence) ||\r
                 (stretchGroup.getStartRes() > res) ||\r
                 (stretchGroup.getEndRes() < res))\r
         {\r
@@ -859,57 +1234,84 @@ public class SeqPanel extends JPanel implements MouseListener,
                             (allGroups[i].getEndRes() >= res))\r
                     {\r
                         stretchGroup = allGroups[i];\r
-                        av.setSelectionGroup(stretchGroup);\r
-\r
                         break;\r
                     }\r
                 }\r
             }\r
+\r
+            av.setSelectionGroup(stretchGroup);\r
+\r
         }\r
 \r
-        if (stretchGroup == null)\r
+\r
+        if (javax.swing.SwingUtilities.isRightMouseButton(evt))\r
         {\r
-            // define a new group here\r
-            SequenceGroup sg = new SequenceGroup();\r
-            sg.setStartRes(res);\r
-            sg.setEndRes(res);\r
-            sg.addSequence(sequence, false);\r
-            av.setSelectionGroup(sg);\r
-            stretchGroup = sg;\r
-\r
-            if (av.getConservationSelected())\r
+          Vector allFeatures = getAllFeaturesAtRes(sequence.getDatasetSequence(),\r
+                                                  sequence.findPosition(res));\r
+          Vector links = new Vector();\r
+            for (int i = 0; i < allFeatures.size(); i++)\r
             {\r
-                SliderPanel.setConservationSlider(ap,\r
-                    av.getGlobalColourScheme(), "Background");\r
+              SequenceFeature sf = (SequenceFeature) allFeatures.elementAt(i);\r
+              if (sf.links != null)\r
+              {\r
+                for (int j = 0; j < sf.links.size(); j++)\r
+                {\r
+                  links.addElement(sf.links.elementAt(j));\r
+                }\r
+              }\r
             }\r
 \r
-            if (av.getAbovePIDThreshold())\r
-            {\r
-                SliderPanel.setPIDSliderSource(ap, av.getGlobalColourScheme(),\r
-                    "Background");\r
-            }\r
-        }\r
-        else if (javax.swing.SwingUtilities.isRightMouseButton(evt))\r
-        {\r
-            jalview.gui.PopupMenu pop = new jalview.gui.PopupMenu(ap, null);\r
+            jalview.gui.PopupMenu pop = new jalview.gui.PopupMenu(ap, null, links);\r
             pop.show(this, evt.getX(), evt.getY());\r
+            return;\r
+        }\r
 \r
-            // edit the properties of existing group\r
+        if (av.cursorMode)\r
+        {\r
+          seqCanvas.cursorX = findRes(evt);\r
+          seqCanvas.cursorY = findSeq(evt);\r
+          seqCanvas.repaint();\r
+          return;\r
         }\r
 \r
-        if ((stretchGroup != null) && (stretchGroup.getEndRes() == res))\r
+        if (stretchGroup == null)\r
         {\r
+          //Only if left mouse button do we want to change group sizes\r
+\r
+          // define a new group here\r
+          SequenceGroup sg = new SequenceGroup();\r
+          sg.setStartRes(res);\r
+          sg.setEndRes(res);\r
+          sg.addSequence(sequence, false);\r
+          av.setSelectionGroup(sg);\r
+          stretchGroup = sg;\r
+\r
+          if (av.getConservationSelected())\r
+          {\r
+            SliderPanel.setConservationSlider(ap,\r
+                                              av.getGlobalColourScheme(),\r
+                                              "Background");\r
+          }\r
+\r
+          if (av.getAbovePIDThreshold())\r
+          {\r
+            SliderPanel.setPIDSliderSource(ap, av.getGlobalColourScheme(),\r
+                                           "Background");\r
+          }\r
+          if ( (stretchGroup != null) && (stretchGroup.getEndRes() == res))\r
+          {\r
             // Edit end res position of selected group\r
             changeEndRes = true;\r
-        }\r
-        else if ((stretchGroup != null) && (stretchGroup.getStartRes() == res))\r
-        {\r
+          }\r
+          else if ( (stretchGroup != null) &&\r
+                   (stretchGroup.getStartRes() == res))\r
+          {\r
             // Edit end res position of selected group\r
             changeStartRes = true;\r
+          }\r
+          stretchGroup.getWidth();\r
         }\r
 \r
-        stretchGroup.getWidth();\r
-\r
         seqCanvas.repaint();\r
     }\r
 \r
@@ -930,8 +1332,8 @@ public class SeqPanel extends JPanel implements MouseListener,
         {\r
           if (stretchGroup.cs instanceof ClustalxColourScheme)\r
           {\r
-            ( (ClustalxColourScheme) stretchGroup.cs).resetClustalX(stretchGroup.\r
-                sequences,\r
+            ( (ClustalxColourScheme) stretchGroup.cs).resetClustalX(\r
+                stretchGroup.getSequences(true),\r
                 stretchGroup.getWidth());\r
           }\r
 \r
@@ -971,10 +1373,9 @@ public class SeqPanel extends JPanel implements MouseListener,
             return;\r
        }\r
 \r
-\r
-        if(y > av.alignment.getHeight())\r
+        if(res> av.alignment.getWidth())\r
         {\r
-          y = av.alignment.getHeight() -1;\r
+          res = av.alignment.getWidth()-1;\r
         }\r
 \r
         if (stretchGroup.getEndRes() == res)\r
@@ -1033,7 +1434,7 @@ public class SeqPanel extends JPanel implements MouseListener,
 \r
             Sequence nextSeq = (Sequence) av.getAlignment().getSequenceAt(oldSeq);\r
 \r
-            if (stretchGroup.sequences.contains(nextSeq))\r
+            if (stretchGroup.getSequences(false).contains(nextSeq))\r
             {\r
                 stretchGroup.deleteSequence(seq, false);\r
             }\r
@@ -1061,6 +1462,27 @@ public class SeqPanel extends JPanel implements MouseListener,
         seqCanvas.repaint();\r
     }\r
 \r
+    void scrollCanvas(MouseEvent evt)\r
+    {\r
+      if(evt==null)\r
+      {\r
+        if(scrollThread!=null)\r
+        {\r
+          scrollThread.running = false;\r
+          scrollThread = null;\r
+        }\r
+        mouseDragging = false;\r
+      }\r
+      else\r
+      {\r
+        if (scrollThread == null)\r
+          scrollThread = new ScrollThread();\r
+\r
+        mouseDragging = true;\r
+        scrollThread.setEvent(evt);\r
+      }\r
+\r
+    }\r
 \r
 \r
     // this class allows scrolling off the bottom of the visible alignment\r
@@ -1106,11 +1528,11 @@ public class SeqPanel extends JPanel implements MouseListener,
 \r
                     if (mouseDragging && (evt.getX() < 0))\r
                     {\r
-                        running = ap.scrollRight(true);\r
+                        running = ap.scrollRight(false);\r
                     }\r
                     else if (mouseDragging && (evt.getX() >= getWidth()))\r
                     {\r
-                        running = ap.scrollRight(false);\r
+                        running = ap.scrollRight(true);\r
                     }\r
                 }\r
 \r