X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Fappletgui%2FTooltip.java;h=0bbe98bc81a0e5b3ad758bdbfc3274dbcd0762fe;hb=12e7f97678ce85b0238f987d5f4eaf18512a0b94;hp=90f2e97263d148b64f34e1a8226f631a2a9f777b;hpb=7bc226b58110fa26d9dbd3f0c78095d06909ffc3;p=jalview.git

diff --git a/src/jalview/appletgui/Tooltip.java b/src/jalview/appletgui/Tooltip.java
index 90f2e97..0bbe98b 100755
--- a/src/jalview/appletgui/Tooltip.java
+++ b/src/jalview/appletgui/Tooltip.java
@@ -1,22 +1,21 @@
 /*
- * Jalview - A Sequence Alignment Editor and Viewer
- * Copyright (C) 2007 AM Waterhouse, J Procter, G Barton, M Clamp, S Searle
- *
+ * Jalview - A Sequence Alignment Editor and Viewer (Version 2.4)
+ * Copyright (C) 2008 AM Waterhouse, J Procter, G Barton, M Clamp, S Searle
+ * 
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
  * as published by the Free Software Foundation; either version 2
  * of the License, or (at your option) any later version.
- *
+ * 
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
- *
+ * 
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  */
-
 package jalview.appletgui;
 
 import java.applet.*;
@@ -25,21 +24,25 @@ import java.util.*;
 import java.awt.*;
 import java.awt.event.*;
 
-public class Tooltip
-    extends Canvas implements MouseListener,
-    MouseMotionListener
+public class Tooltip extends Canvas implements MouseListener,
+        MouseMotionListener
 {
   private String[] tip;
+
   private String lastTip = "";
+
   private boolean setPosition = false;
+
   protected Component owner;
 
   private Container mainContainer;
+
   private LayoutManager mainLayout;
 
   private boolean shown;
 
   private final int VERTICAL_OFFSET = 20;
+
   private final int HORIZONTAL_ENLARGE = 10;
 
   int fontHeight = 0;
@@ -77,15 +80,15 @@ public class Tooltip
       {
         if (lindex > 0)
         {
-          g.drawString(tip[i].substring(0, lindex), 3, (i + 1) * fontHeight - 3);
+          g.drawString(tip[i].substring(0, lindex), 3, (i + 1) * fontHeight
+                  - 3);
           x += fm.stringWidth(tip[i].substring(0, lindex) + 3);
         }
         g.drawImage(linkImage, x, i * fontHeight + 1, this);
         if (lindex + 6 < tip[i].length())
         {
-          g.drawString(tip[i].substring(lindex + 6),
-                       x + linkImage.getWidth(this),
-                       (i + 1) * fontHeight - 3);
+          g.drawString(tip[i].substring(lindex + 6), x
+                  + linkImage.getWidth(this), (i + 1) * fontHeight - 3);
         }
       }
       else
@@ -128,8 +131,7 @@ public class Tooltip
       index++;
     }
 
-    setSize(longestLine + HORIZONTAL_ENLARGE,
-            fontHeight * this.tip.length);
+    setSize(longestLine + HORIZONTAL_ENLARGE, fontHeight * this.tip.length);
 
     repaint();
 
@@ -137,17 +139,21 @@ public class Tooltip
 
   void setTipLocation(MouseEvent evt)
   {
-    setLocation( (owner.getLocationOnScreen().x
-                  - mainContainer.getLocationOnScreen().x) + evt.getX(),
-                (owner.getLocationOnScreen().y -
-                 mainContainer.getLocationOnScreen().y
-                 + VERTICAL_OFFSET) + evt.getY());
+    if (mainContainer == null || owner == null)
+    {
+      return;
+    }
+    setLocation((owner.getLocationOnScreen().x - mainContainer
+            .getLocationOnScreen().x)
+            + evt.getX(), (owner.getLocationOnScreen().y
+            - mainContainer.getLocationOnScreen().y + VERTICAL_OFFSET)
+            + evt.getY());
 
     // correction, whole tool tip must be visible
     if (mainContainer.getSize().width < (getLocation().x + getSize().width))
     {
       setLocation(mainContainer.getSize().width - getSize().width,
-                  getLocation().y);
+              getLocation().y);
     }
   }
 
@@ -167,7 +173,7 @@ public class Tooltip
     Container parent = owner.getParent();
     while (true)
     {
-      if ( (parent instanceof Applet) || (parent instanceof Frame))
+      if ((parent instanceof Applet) || (parent instanceof Frame))
       {
         mainContainer = parent;
         break;
@@ -196,10 +202,12 @@ public class Tooltip
   }
 
   public void mouseReleased(MouseEvent me)
-  {}
+  {
+  }
 
   public void mouseClicked(MouseEvent me)
-  {}
+  {
+  }
 
   public void mouseMoved(MouseEvent me)
   {
@@ -220,5 +228,6 @@ public class Tooltip
   }
 
   public void mouseDragged(MouseEvent me)
-  {}
+  {
+  }
 }