X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Fgui%2FSeqPanel.java;h=845004bdb05d1391565f86889238045bd45eb59a;hb=5640ec0623c6d1205e62f9fe15292f32bfdab7d9;hp=ce60be6f5718ab1d53f452aba3ba77ea56f406fd;hpb=c932f0e85a8852824cdd8ce790af68682732c85c;p=jalview.git

diff --git a/src/jalview/gui/SeqPanel.java b/src/jalview/gui/SeqPanel.java
index ce60be6..845004b 100644
--- a/src/jalview/gui/SeqPanel.java
+++ b/src/jalview/gui/SeqPanel.java
@@ -343,6 +343,15 @@ public class SeqPanel extends JPanel
   }
 
   /**
+   * @param evt
+   * @return absolute column in alignment nearest to the mouse pointer
+   */
+  int findAlignmentColumn(MouseEvent evt)
+  {
+    return findNearestColumn(evt, true);
+  }
+
+  /**
    * Returns the aligned sequence position (base 0) at the mouse position, or
    * the closest visible one
    * <p>
@@ -354,6 +363,17 @@ public class SeqPanel extends JPanel
    */
   int findColumn(MouseEvent evt)
   {
+    return findNearestColumn(evt, false);
+  }
+
+  /**
+   * @param nearestColumn
+   *          when false returns negative values for out of bound positions - -1
+   *          for scale left/right, <-1 if far to right
+   * @return nearest absolute column to mouse pointer
+   */
+  private int findNearestColumn(MouseEvent evt, boolean nearestColumn)
+  {
     int res = 0;
     int x = evt.getX();
 
@@ -377,7 +397,14 @@ public class SeqPanel extends JPanel
       if (x < 0)
       {
         // mouse is over left scale
-        return -1;
+        if (!nearestColumn)
+        {
+          return -1;
+        }
+        else
+        {
+          x = 0;
+        }
       }
 
       int cwidth = seqCanvas.getWrappedCanvasWidth(this.getWidth());
@@ -387,8 +414,15 @@ public class SeqPanel extends JPanel
       }
       if (x >= cwidth * charWidth)
       {
-        // mouse is over right scale
-        return -1;
+        if (!nearestColumn)
+        {
+          // mouse is over right scale
+          return -1;
+        }
+        else
+        {
+          x = cwidth * charWidth - 1;
+        }
       }
 
       wrappedBlock = y / cHeight;
@@ -405,8 +439,14 @@ public class SeqPanel extends JPanel
        * rather than right-hand gutter
        */
       x = Math.min(x, seqCanvas.getX() + seqCanvas.getWidth());
+      if (nearestColumn)
+      {
+        x = Math.max(x, 0);
+      }
+
       res = (x / charWidth) + startRes;
       res = Math.min(res, av.getRanges().getEndRes());
+
     }
 
     if (av.hasHiddenColumns())
@@ -2181,32 +2221,85 @@ public class SeqPanel extends JPanel
     }
   }
 
+  /**
+   * Responds to a mouse wheel movement by scrolling the alignment
+   * <ul>
+   * <li>left or right, if the shift key is down, else up or down</li>
+   * <li>right (or down) if the reported mouse movement is positive</li>
+   * <li>left (or up) if the reported mouse movement is negative</li>
+   * </ul>
+   * Note that this method may also be fired by scrolling with a gesture on a
+   * trackpad.
+   */
   @Override
   public void mouseWheelMoved(MouseWheelEvent e)
   {
     e.consume();
     double wheelRotation = e.getPreciseWheelRotation();
+
+    /*
+     * scroll more for large (fast) mouse movements
+     */
+    int size = 1 + (int) Math.abs(wheelRotation);
+
     if (wheelRotation > 0)
     {
       if (e.isShiftDown())
       {
-        av.getRanges().scrollRight(true);
-
+        /*
+         * scroll right
+         * stop trying to scroll right when limit is reached (saves
+         * expensive calls to Alignment.getWidth())
+         */
+        while (size-- > 0 && !ap.isScrolledFullyRight())
+        {
+          if (!av.getRanges().scrollRight(true))
+          {
+            break;
+          }
+        }
       }
       else
       {
-        av.getRanges().scrollUp(false);
+        /*
+         * scroll down
+         */
+        while (size-- > 0)
+        {
+          if (!av.getRanges().scrollUp(false))
+          {
+            break;
+          }
+        }
       }
     }
     else if (wheelRotation < 0)
     {
       if (e.isShiftDown())
       {
-        av.getRanges().scrollRight(false);
+        /*
+         * scroll left
+         */
+        while (size-- > 0)
+        {
+          if (!av.getRanges().scrollRight(false))
+          {
+            break;
+          }
+        }
       }
       else
       {
-        av.getRanges().scrollUp(true);
+        /*
+         * scroll up
+         */
+        while (size-- > 0)
+        {
+          if (!av.getRanges().scrollUp(true))
+          {
+            break;
+          }
+        }
       }
     }