set hand cursor over hyperlinks

git-svn-id: svn+ssh://svn.internal.sanger.ac.uk/repos/svn/pathsoft/artemis/trunk@6386 ee4ac58c-ac51-4696-9907-e4b3aa274f04

uk/ac/sanger/artemis/components/QualifierTextArea.java

@@ -20,7 +20,7 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  *
- * $Header: //tmp/pathsoft/artemis/uk/ac/sanger/artemis/components/QualifierTextArea.java,v 1.5 2007-09-13 10:15:28 tjc Exp $
+ * $Header: //tmp/pathsoft/artemis/uk/ac/sanger/artemis/components/QualifierTextArea.java,v 1.6 2007-09-14 10:13:49 tjc Exp $
  */
 
 package uk.ac.sanger.artemis.components;
@@ -35,11 +35,13 @@ import uk.ac.sanger.artemis.io.EmblStreamFeature;
 import uk.ac.sanger.artemis.util.StringVector;
 
 import java.awt.Color;
+import java.awt.Cursor;
 import java.awt.Dimension;
 import java.awt.FontMetrics;
 import java.awt.Point;
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
+import java.awt.event.MouseMotionListener;
 import java.io.IOException;
 import java.io.StringReader;
 
@@ -55,9 +57,13 @@ import javax.swing.text.StyledDocument;
  *  (rather than using HyperlinkListener) so it can remain editable.
  **/
 public class QualifierTextArea extends JTextPane
+    implements MouseMotionListener
 {
   private static String[] DATABASES = 
           { "SWALL", "EMBL", "UniProt", "PMID", "PubMed", "InterPro" };
+  private static Cursor cbusy = new Cursor(Cursor.WAIT_CURSOR);
+  private static Cursor cdone = new Cursor(Cursor.DEFAULT_CURSOR);
+  private static Cursor chand = new Cursor(Cursor.HAND_CURSOR);
   
   /**
    *  Create a new QualifierTextArea containing no text.
@@ -85,10 +91,12 @@ public class QualifierTextArea extends JTextPane
     {
       public void mouseClicked(MouseEvent e)
       {
-        if(e.getClickCount() == 2) 
-          handleMouseDoubleClick(e);
+        if(e.getClickCount() == 1) 
+          handleMouseSingleClick(e);
       }
     });
+    
+    super.addMouseMotionListener(this);
   }
 
   
@@ -258,66 +266,103 @@ public class QualifierTextArea extends JTextPane
    * Process double click event.
    * @param e
    */
-  private void handleMouseDoubleClick(final MouseEvent e)
-  {
-    Point pt = new Point(e.getX(), e.getY());
-    int pos = viewToModel(pt);
-    int start;
-    if(pos < 15)
-      start = 0;
-    else
-      start = pos - 15;
-    
-    int length = 30;
-    
-    if( (start+30) >  getStyledDocument().getLength() )
-      length = getStyledDocument().getLength()-start;
-    
-    try
+  private void handleMouseSingleClick(final MouseEvent e)
   {
-      String textAtPosition = getStyledDocument().getText(start, length);
-
-      int indEnd = getEndOfLink(textAtPosition, (pos-start));
-      textAtPosition = textAtPosition.substring(0, indEnd);
-      
-      int intStart = getStartOfLink(textAtPosition);
-      if(intStart < 0)
+    final String hyperlinkText = getHyperlinkTextAtMouseEvent(e);
+    if(hyperlinkText == null)
       return;
       
-      textAtPosition = textAtPosition.substring(intStart);
-      
-      String cmd;
-      if(textAtPosition.indexOf("PMID")   > -1 ||
-         textAtPosition.indexOf("PubMed") > -1)
+    final String cmd;
+    if(hyperlinkText.indexOf("PMID")   > -1 ||
+        hyperlinkText.indexOf("PubMed") > -1)
     {
-        String id[] = textAtPosition.split(":");
+      String id[] = hyperlinkText.split(":");
       if(id.length < 2)
         return;
       cmd = getPubMedSite()+id[1];
     }
-      else if(textAtPosition.indexOf("InterPro") > -1)
+    else if(hyperlinkText.indexOf("InterPro") > -1)
     {
-        String id[] = textAtPosition.split(":");
+      String id[] = hyperlinkText.split(":");
       if(id.length < 2)
         return;
       cmd = getInterProSite()+id[1];
     }
     else
     {
-        cmd = DataCollectionPane.getSrsSite()+"/wgetz?-e+["+textAtPosition+"]";
+      String cmd2 = DataCollectionPane.getSrsSite()+"/wgetz?-e+["+hyperlinkText+"]";
 
+      int ind = cmd2.indexOf("UniProt:");
       // link to uniprot accession
-        if( (intStart = cmd.indexOf("UniProt:")) > -1)
-          cmd = cmd.substring(0,intStart+7)+"-acc:"+
-                cmd.substring(intStart+8);
-        if(cmd.indexOf("ebi.ac.uk") > -1)
-          cmd = cmd + "+-vn+2";
+      if(ind > -1)
+        cmd2 = cmd2.substring(0,ind+7)+"-acc:"+
+               cmd2.substring(ind+8);
+      if(cmd2.indexOf("ebi.ac.uk") > -1)
+        cmd2 = cmd2 + "+-vn+2";
+      cmd = cmd2;
     }
+      
+    SwingWorker browserLaunch = new SwingWorker()
+    {
+      public Object construct()
+      {
+        setCursor(cbusy);
         BrowserControl.displayURL(cmd);
+        setCursor(cdone);
+        return null;
+      }
+    };
+    browserLaunch.start();
+  }
+
+  public void mouseDragged(MouseEvent e){}
+  public void mouseMoved(MouseEvent e)
+  {
+    String hyperlinkText = getHyperlinkTextAtMouseEvent(e);
+    if(hyperlinkText == null)
+      setCursor(cdone);
+    else
+      setCursor(chand);
+  }
+  
+  /**
+   * Get hyperlink text from a MouseEvent position. Return null if
+   * no hyperlink found.
+   * @param e
+   * @return
+   */
+  private String getHyperlinkTextAtMouseEvent(final MouseEvent e)
+  {
+    final Point pt = new Point(e.getX(), e.getY());
+    final int pos = viewToModel(pt);
+    final int start;
+    if(pos < 15)
+      start = 0;
+    else
+      start = pos - 15;
+    
+    int length = 30;
+    if( (start+30) >  getStyledDocument().getLength() )
+      length = getStyledDocument().getLength()-start;
+    
+    try
+    {
+      String textAtPosition = getStyledDocument().getText(start, length);
+      int indEnd = getEndOfLink(textAtPosition, (pos-start));
+      if(indEnd < 0)
+        return null;
+        
+      textAtPosition = textAtPosition.substring(0, indEnd);
+         
+      int indStart = getStartOfLink(textAtPosition);
+      if(indStart < 0)
+        return null;
+      return textAtPosition.substring(indStart);
     }
     catch(BadLocationException e1)
     {
-      e1.printStackTrace();
+      //e1.printStackTrace();
     }
+    return null;
   }
 }