Jalview 2.6 source licence
[jalview.git] / src / jalview / gui / WebserviceInfo.java
index c8beeb1..4d0c634 100755 (executable)
@@ -1,20 +1,19 @@
 /*
- * Jalview - A Sequence Alignment Editor and Viewer
- * Copyright (C) 2005 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
+ * Jalview - A Sequence Alignment Editor and Viewer (Version 2.6)
+ * Copyright (C) 2010 J Procter, AM Waterhouse, G Barton, M Clamp, S Searle
+ * 
+ * This file is part of Jalview.
+ * 
+ * Jalview 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 3 of the License, or (at your option) any later version.
+ * 
+ * Jalview 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 Jalview.  If not, see <http://www.gnu.org/licenses/>.
  */
 package jalview.gui;
 
@@ -26,447 +25,603 @@ import java.awt.image.*;
 import javax.swing.*;
 
 import jalview.jbgui.*;
-
+import jalview.ws.WSClientI;
 
 /**
  * Base class for web service client thread and gui
- *
+ * 
  * @author $author$
  * @version $Revision$
  */
 public class WebserviceInfo extends GWebserviceInfo
 {
 
-    /** Job is Queued */
-    public static final int STATE_QUEUING = 0;
-
-    /** Job is Running */
-    public static final int STATE_RUNNING = 1;
-
-    /** Job has finished with no errors */
-    public static final int STATE_STOPPED_OK = 2;
-
-    /** Job has been cancelled with no errors */
-    public static final int STATE_CANCELLED_OK = 3;
-
-    /** job has stopped because of some error */
-    public static final int STATE_STOPPED_ERROR = 4;
-
-    /** job has failed because of some unavoidable service interruption */
-    public static final int STATE_STOPPED_SERVERERROR = 5;
-    int currentStatus = STATE_QUEUING;
-    Image image;
-    int angle = 0;
-    String title = "";
-    jalview.ws.WSClientI thisService;
-    boolean serviceIsCancellable;
-    JInternalFrame frame;
-    JTabbedPane subjobs=null;
-    java.util.Vector jobPanes = null;
-    // tabbed or not
-    public synchronized int addJobPane() {
-      JScrollPane jobpane = new JScrollPane();
-      JTextArea progressText = new JTextArea();
-      progressText.setFont(new java.awt.Font("Verdana", 0, 10));
-      progressText.setBorder(null);
-      progressText.setEditable(false);
-      progressText.setText("WS Job");
-      progressText.setLineWrap(true);
-      progressText.setWrapStyleWord(true);
-      jobpane.setName("JobPane");
-      jobpane.getViewport().add(progressText, null);
-      jobpane.setBorder(null);
-      if (jobPanes==null) {
-        jobPanes = new Vector();
-      }
-      int newpane = jobPanes.size();
-      jobPanes.add(jobpane);
+  /** Job is Queued */
+  public static final int STATE_QUEUING = 0;
 
-      if (newpane==0) {
-        this.add(jobpane, BorderLayout.CENTER);
-      } else {
-        if (newpane==1) {
-        // revert to a tabbed pane.
-        JScrollPane firstpane;
-        this.remove(firstpane=(JScrollPane) jobPanes.get(0));
-        subjobs=new JTabbedPane();
-          this.add(subjobs, BorderLayout.CENTER);
-          subjobs.add(firstpane);
-          subjobs.setTitleAt(0, firstpane.getName());
-        }
-        subjobs.add(jobpane);
-      }
-      return newpane; // index for accessor methods below
-    }
-    /**
-     * Creates a new WebserviceInfo object.
-     *
-     * @param title short name and job type
-     * @param info reference or other human readable description
-     */
-    public WebserviceInfo(String title, String info)
-    {
-        init(title, info, 520, 500);
-    }
+  /** Job is Running */
+  public static final int STATE_RUNNING = 1;
 
-    /**
-     * Creates a new WebserviceInfo object.
-     *
-     * @param title DOCUMENT ME!
-     * @param info DOCUMENT ME!
-     * @param width DOCUMENT ME!
-     * @param height DOCUMENT ME!
-     */
-    public WebserviceInfo(String title, String info, int width, int height)
-    {
-        init(title, info, width, height);
-    }
+  /** Job has finished with no errors */
+  public static final int STATE_STOPPED_OK = 2;
 
-    /**
-     * DOCUMENT ME!
-     *
-     * @return DOCUMENT ME!
-     */
-    public jalview.ws.WSClientI getthisService()
-    {
-        return thisService;
-    }
+  /** Job has been cancelled with no errors */
+  public static final int STATE_CANCELLED_OK = 3;
 
-    /**
-     * DOCUMENT ME!
-     *
-     * @param newservice DOCUMENT ME!
-     */
-    public void setthisService(jalview.ws.WSClientI newservice)
-    {
-        thisService = newservice;
-        serviceIsCancellable = newservice.isCancellable();
-    }
+  /** job has stopped because of some error */
+  public static final int STATE_STOPPED_ERROR = 4;
 
-    /**
-     * DOCUMENT ME!
-     *
-     * @param title DOCUMENT ME!
-     * @param info DOCUMENT ME!
-     * @param width DOCUMENT ME!
-     * @param height DOCUMENT ME!
-     */
-    void init(String title, String info, int width, int height)
-    {
-        frame = new JInternalFrame();
-        frame.setContentPane(this);
-        Desktop.addInternalFrame(frame, title, width, height);
-        frame.setClosable(false);
+  /** job has failed because of some unavoidable service interruption */
+  public static final int STATE_STOPPED_SERVERERROR = 5;
 
-        this.title = title;
-        setInfoText(info);
+  int currentStatus = STATE_QUEUING;
 
-        java.net.URL url = getClass().getResource("/images/logo.gif");
-        image = java.awt.Toolkit.getDefaultToolkit().createImage(url);
+  Image image;
 
-        MediaTracker mt = new MediaTracker(this);
-        mt.addImage(image, 0);
+  int angle = 0;
 
-        try
-        {
-            mt.waitForID(0);
-        }
-        catch (Exception ex)
-        {
-        }
+  String title = "";
+
+  jalview.ws.WSClientI thisService;
+
+  boolean serviceIsCancellable;
+
+  JInternalFrame frame;
+
+  JTabbedPane subjobs = null;
+
+  java.util.Vector jobPanes = null;
 
-        AnimatedPanel ap = new AnimatedPanel();
-        titlePanel.add(ap, BorderLayout.CENTER);
+  private boolean serviceCanMergeResults = false;
 
-        Thread thread = new Thread(ap);
-        thread.start();
+  private boolean viewResultsImmediatly = true;
+
+  // tabbed or not
+  public synchronized int addJobPane()
+  {
+    JScrollPane jobpane = new JScrollPane();
+    JTextArea progressText = new JTextArea();
+    progressText.setFont(new java.awt.Font("Verdana", 0, 10));
+    progressText.setBorder(null);
+    progressText.setEditable(false);
+    progressText.setText("WS Job");
+    progressText.setLineWrap(true);
+    progressText.setWrapStyleWord(true);
+    jobpane.setName("JobPane");
+    jobpane.getViewport().add(progressText, null);
+    jobpane.setBorder(null);
+    if (jobPanes == null)
+    {
+      jobPanes = new Vector();
     }
+    int newpane = jobPanes.size();
+    jobPanes.add(jobpane);
 
-    /**
-     * DOCUMENT ME!
-     *
-     * @param status integer status from state constants
-     */
-    public void setStatus(int status)
+    if (newpane == 0)
     {
-        currentStatus = status;
+      this.add(jobpane, BorderLayout.CENTER);
     }
-    /**
-     * subjob status indicator
-     * @param jobpane
-     * @param status
-     */
-    public void setStatus(int jobpane, int status) {
-      if (jobpane<0 || jobpane>=jobPanes.size()) {
-        throw new Error("setStatus called for non-existent job pane."+jobpane);
+    else
+    {
+      if (newpane == 1)
+      {
+        // revert to a tabbed pane.
+        JScrollPane firstpane;
+        this.remove(firstpane = (JScrollPane) jobPanes.get(0));
+        subjobs = new JTabbedPane();
+        this.add(subjobs, BorderLayout.CENTER);
+        subjobs.add(firstpane);
+        subjobs.setTitleAt(0, firstpane.getName());
       }
-      switch (status) {
-      case STATE_QUEUING:
-        setProgressName(jobpane+" - QUEUED", jobpane);
-        break;
-      case STATE_RUNNING:
-        setProgressName(jobpane+" - RUNNING", jobpane);
-        break;
-      case STATE_STOPPED_OK:
-        setProgressName(jobpane+" - FINISHED", jobpane);
-      break;
-      case STATE_CANCELLED_OK:
-        setProgressName(jobpane+" - CANCELLED", jobpane);
-        break;
-      case STATE_STOPPED_ERROR:
-        setProgressName(jobpane+" - BROKEN",jobpane);
-        break;
-      case STATE_STOPPED_SERVERERROR:
-        setProgressName(jobpane+" - ALERT", jobpane);
-        break;
-        default:
-          setProgressName(jobpane+" - UNKNOWN STATE", jobpane);
+      subjobs.add(jobpane);
+    }
+    return newpane; // index for accessor methods below
+  }
+
+  /**
+   * Creates a new WebserviceInfo object.
+   * 
+   * @param title
+   *          short name and job type
+   * @param info
+   *          reference or other human readable description
+   */
+  public WebserviceInfo(String title, String info)
+  {
+    init(title, info, 520, 500);
+  }
+
+  /**
+   * Creates a new WebserviceInfo object.
+   * 
+   * @param title
+   *          DOCUMENT ME!
+   * @param info
+   *          DOCUMENT ME!
+   * @param width
+   *          DOCUMENT ME!
+   * @param height
+   *          DOCUMENT ME!
+   */
+  public WebserviceInfo(String title, String info, int width, int height)
+  {
+    init(title, info, width, height);
+  }
+
+  /**
+   * DOCUMENT ME!
+   * 
+   * @return DOCUMENT ME!
+   */
+  public jalview.ws.WSClientI getthisService()
+  {
+    return thisService;
+  }
+
+  /**
+   * Update state of GUI based on client capabilities (like whether the job is
+   * cancellable, whether the 'merge results' button is shown.
+   * 
+   * @param newservice
+   *          service client to query for capabilities
+   */
+  public void setthisService(jalview.ws.WSClientI newservice)
+  {
+    thisService = newservice;
+    serviceIsCancellable = newservice.isCancellable();
+    frame.setClosable(!serviceIsCancellable);
+    serviceCanMergeResults = newservice.canMergeResults();
+    rebuildButtonPanel();
+  }
+
+  private void rebuildButtonPanel()
+  {
+    if (buttonPanel != null)
+    {
+      buttonPanel.removeAll();
+      if (serviceIsCancellable)
+      {
+        buttonPanel.add(cancel);
+        frame.setClosable(false);
+      }
+      else
+      {
+        frame.setClosable(true);
       }
     }
-    /**
-     * DOCUMENT ME!
-     *
-     * @return DOCUMENT ME!
-     */
-    public String getInfoText()
+  }
+
+  /**
+   * DOCUMENT ME!
+   * 
+   * @param title
+   *          DOCUMENT ME!
+   * @param info
+   *          DOCUMENT ME!
+   * @param width
+   *          DOCUMENT ME!
+   * @param height
+   *          DOCUMENT ME!
+   */
+  void init(String title, String info, int width, int height)
+  {
+    frame = new JInternalFrame();
+    frame.setContentPane(this);
+    Desktop.addInternalFrame(frame, title, width, height);
+    frame.setClosable(false);
+
+    this.title = title;
+    setInfoText(info);
+
+    java.net.URL url = getClass().getResource("/images/logo.gif");
+    image = java.awt.Toolkit.getDefaultToolkit().createImage(url);
+
+    MediaTracker mt = new MediaTracker(this);
+    mt.addImage(image, 0);
+
+    try
+    {
+      mt.waitForID(0);
+    } catch (Exception ex)
     {
-        return infoText.getText();
     }
 
-    /**
-     * DOCUMENT ME!
-     *
-     * @param text DOCUMENT ME!
-     */
-    public void setInfoText(String text)
+    AnimatedPanel ap = new AnimatedPanel();
+    titlePanel.add(ap, BorderLayout.CENTER);
+
+    Thread thread = new Thread(ap);
+    thread.start();
+    final WebserviceInfo thisinfo = this;
+    frame.addInternalFrameListener(new javax.swing.event.InternalFrameAdapter()
     {
-        infoText.setText(text);
+      public void internalFrameClosed(
+              javax.swing.event.InternalFrameEvent evt)
+      {
+        // System.out.println("Shutting down webservice client");
+        WSClientI service = thisinfo.getthisService();
+        if (service != null && service.isCancellable())
+        {
+          service.cancelJob();
+        }
+      };
+    });
+    frame.validate();
+
+  }
+
+  /**
+   * DOCUMENT ME!
+   * 
+   * @param status
+   *          integer status from state constants
+   */
+  public void setStatus(int status)
+  {
+    currentStatus = status;
+  }
+
+  /**
+   * subjob status indicator
+   * 
+   * @param jobpane
+   * @param status
+   */
+  public void setStatus(int jobpane, int status)
+  {
+    if (jobpane < 0 || jobpane >= jobPanes.size())
+    {
+      throw new Error("setStatus called for non-existent job pane."
+              + jobpane);
     }
-
-    /**
-     * DOCUMENT ME!
-     *
-     * @param text DOCUMENT ME!
-     */
-    public void appendInfoText(String text)
+    switch (status)
     {
-        infoText.append(text);
+    case STATE_QUEUING:
+      setProgressName(jobpane + " - QUEUED", jobpane);
+      break;
+    case STATE_RUNNING:
+      setProgressName(jobpane + " - RUNNING", jobpane);
+      break;
+    case STATE_STOPPED_OK:
+      setProgressName(jobpane + " - FINISHED", jobpane);
+      break;
+    case STATE_CANCELLED_OK:
+      setProgressName(jobpane + " - CANCELLED", jobpane);
+      break;
+    case STATE_STOPPED_ERROR:
+      setProgressName(jobpane + " - BROKEN", jobpane);
+      break;
+    case STATE_STOPPED_SERVERERROR:
+      setProgressName(jobpane + " - ALERT", jobpane);
+      break;
+    default:
+      setProgressName(jobpane + " - UNKNOWN STATE", jobpane);
     }
-    /**
-     * DOCUMENT ME!
-     *
-     * @return DOCUMENT ME!
-     */
-    public String getProgressText(int which)
+  }
+
+  /**
+   * DOCUMENT ME!
+   * 
+   * @return DOCUMENT ME!
+   */
+  public String getInfoText()
+  {
+    return infoText.getText();
+  }
+
+  /**
+   * DOCUMENT ME!
+   * 
+   * @param text
+   *          DOCUMENT ME!
+   */
+  public void setInfoText(String text)
+  {
+    infoText.setText(text);
+  }
+
+  /**
+   * DOCUMENT ME!
+   * 
+   * @param text
+   *          DOCUMENT ME!
+   */
+  public void appendInfoText(String text)
+  {
+    infoText.append(text);
+  }
+
+  /**
+   * DOCUMENT ME!
+   * 
+   * @return DOCUMENT ME!
+   */
+  public String getProgressText(int which)
+  {
+    if (jobPanes == null)
     {
-      if (jobPanes == null)
-        addJobPane();
-      return ( (JTextArea) ( (JScrollPane) jobPanes.get(which)).getViewport().
-              getComponent(0)).getText();
+      addJobPane();
     }
-    /**
-     * DOCUMENT ME!
-     *
-     * @param text DOCUMENT ME!
-     */
-    public void setProgressText(int which, String text)
+    return ((JTextArea) ((JScrollPane) jobPanes.get(which)).getViewport()
+            .getComponent(0)).getText();
+  }
+
+  /**
+   * DOCUMENT ME!
+   * 
+   * @param text
+   *          DOCUMENT ME!
+   */
+  public void setProgressText(int which, String text)
+  {
+    if (jobPanes == null)
     {
-      if (jobPanes == null)
-        addJobPane();
-      ( (JTextArea) ( (JScrollPane) jobPanes.get(which)).getViewport().
-       getComponent(0)).setText(text);
+      addJobPane();
     }
-
-    /**
-     * DOCUMENT ME!
-     *
-     * @param text DOCUMENT ME!
-     */
-    public void appendProgressText(int which, String text)
+    ((JTextArea) ((JScrollPane) jobPanes.get(which)).getViewport()
+            .getComponent(0)).setText(text);
+  }
+
+  /**
+   * DOCUMENT ME!
+   * 
+   * @param text
+   *          DOCUMENT ME!
+   */
+  public void appendProgressText(int which, String text)
+  {
+    if (jobPanes == null)
     {
-      if (jobPanes == null)
-        addJobPane();
-      ( (JTextArea) ( (JScrollPane) jobPanes.get(which)).getViewport().
-       getComponent(0)).append(text);
+      addJobPane();
     }
-    /**
-     * setProgressText(0, text)
-     */
-    public void setProgressText(String text)
+    ((JTextArea) ((JScrollPane) jobPanes.get(which)).getViewport()
+            .getComponent(0)).append(text);
+  }
+
+  /**
+   * setProgressText(0, text)
+   */
+  public void setProgressText(String text)
+  {
+    setProgressText(0, text);
+  }
+
+  /**
+   * appendProgressText(0, text)
+   */
+  public void appendProgressText(String text)
+  {
+    appendProgressText(0, text);
+  }
+
+  /**
+   * getProgressText(0)
+   */
+  public String getProgressText()
+  {
+    return getProgressText(0);
+  }
+
+  /**
+   * get the tab title for a subjob
+   * 
+   * @param which
+   *          int
+   * @return String
+   */
+  public String getProgressName(int which)
+  {
+    if (jobPanes == null)
     {
-      setProgressText(0, text);
+      addJobPane();
     }
-    /**
-     * appendProgressText(0, text)
-     */
-    public void appendProgressText(String text)
+    if (subjobs != null)
     {
-      appendProgressText(0, text);
+      return subjobs.getTitleAt(which);
     }
-    /**
-     * getProgressText(0)
-     */
-    public String getProgressText()
+    else
     {
-      return getProgressText(0);
+      return ((JScrollPane) jobPanes.get(which)).getViewport()
+              .getComponent(0).getName();
     }
-    /**
-     * get the tab title for a subjob
-     * @param which int
-     * @return String
-     */
-    public String getProgressName(int which) {
-      if (jobPanes==null)
-        addJobPane();
-      if (subjobs!=null)
-        return subjobs.getTitleAt(which);
-      else
-        return ((JScrollPane) jobPanes.get(which)).getViewport().getComponent(0).getName();
+  }
+
+  /**
+   * set the tab title for a subjob
+   * 
+   * @param name
+   *          String
+   * @param which
+   *          int
+   */
+  public void setProgressName(String name, int which)
+  {
+    if (subjobs != null)
+    {
+      subjobs.setTitleAt(which, name);
+      subjobs.revalidate();
+      subjobs.repaint();
     }
-    /**
-     * set the tab title for a subjob
-     * @param name String
-     * @param which int
-     */
-    public void setProgressName(String name, int which) {
-      if (subjobs!=null) {
-        subjobs.setTitleAt(which, name);
-        subjobs.revalidate();
-        subjobs.repaint();
-      }
-      JScrollPane c=(JScrollPane) jobPanes.get(which);
-      c.getViewport().getComponent(0).setName(name);
-      c.repaint();
+    JScrollPane c = (JScrollPane) jobPanes.get(which);
+    c.getViewport().getComponent(0).setName(name);
+    c.repaint();
+  }
+
+  /**
+   * Gui action for cancelling the current job, if possible.
+   * 
+   * @param e
+   *          DOCUMENT ME!
+   */
+  protected void cancel_actionPerformed(ActionEvent e)
+  {
+    if (!serviceIsCancellable)
+    {
+      // JBPNote : TODO: We should REALLY just tell the WSClientI to cancel
+      // anyhow - it has to stop threads and clean up
+      // JBPNote : TODO: Instead of a warning, we should have an optional 'Are
+      // you sure?' prompt
+      warnUser("This job cannot be cancelled.\nJust close the window.",
+              "Cancel job");
     }
-
-    /**
-     * Gui action for cancelling the current job, if possible.
-     *
-     * @param e DOCUMENT ME!
-     */
-    protected void cancel_actionPerformed(ActionEvent e)
+    else
     {
-        if (!serviceIsCancellable)
-        {
-            JOptionPane.showInternalMessageDialog(Desktop.desktop,
-                "This job cannot be cancelled.\nJust close the window.", "Cancel job",
-                JOptionPane.WARNING_MESSAGE);
-        }
-        else
-        {
-            frame.setClosable(true);
-            thisService.cancelJob();
-        }
+      thisService.cancelJob();
     }
+    frame.setClosable(true);
+  }
+
+  /**
+   * Spawns a thread that pops up a warning dialog box with the given message
+   * and title.
+   * 
+   * @param message
+   * @param title
+   */
+  public void warnUser(final String message, final String title)
+  {
+    javax.swing.SwingUtilities.invokeLater(new Runnable()
+    {
+      public void run()
+      {
+        JOptionPane.showInternalMessageDialog(Desktop.desktop, message,
+                title, JOptionPane.WARNING_MESSAGE);
 
-    public void setResultsReady()
+      }
+    });
+  }
+
+  /**
+   * Set up GUI for user to get at results - and possibly automatically display
+   * them if viewResultsImmediatly is set.
+   */
+  public void setResultsReady()
+  {
+    frame.setClosable(true);
+    buttonPanel.remove(cancel);
+    buttonPanel.add(showResultsNewFrame);
+    if (serviceCanMergeResults)
     {
-      frame.setClosable(true);
-      buttonPanel.remove(cancel);
-      buttonPanel.add(showResultsNewFrame);
       buttonPanel.add(mergeResults);
-      buttonPanel.setLayout(new GridLayout(2,1,5,5));
-      buttonPanel.validate();
-      validate();
+      buttonPanel.setLayout(new GridLayout(2, 1, 5, 5));
     }
-
+    buttonPanel.validate();
+    validate();
+    if (viewResultsImmediatly)
+    {
+      showResultsNewFrame.doClick();
+    }
+  }
+
+  /**
+   * called when job has finished but no result objects can be passed back to
+   * user
+   */
+  public void setFinishedNoResults()
+  {
+    frame.setClosable(true);
+    buttonPanel.remove(cancel);
+    buttonPanel.validate();
+    validate();
+  }
 
   class AnimatedPanel extends JPanel implements Runnable
+  {
+    long startTime = 0;
+
+    BufferedImage offscreen;
+
+    public void run()
     {
-        long startTime = 0;
-        BufferedImage offscreen;
+      startTime = System.currentTimeMillis();
 
-        public void run()
+      while (currentStatus < STATE_STOPPED_OK)
+      {
+        try
         {
-            startTime = System.currentTimeMillis();
-            Graphics2D g = null;
+          Thread.sleep(50);
 
-            while (currentStatus < STATE_STOPPED_OK)
-            {
-                try
-                {
-                    Thread.sleep(50);
+          int units = (int) ((System.currentTimeMillis() - startTime) / 10f);
+          angle += units;
+          angle %= 360;
+          startTime = System.currentTimeMillis();
 
-                    int units = (int) ( (System.currentTimeMillis() - startTime) /
-                                       10f);
-                    angle += units;
-                    angle %= 360;
-                    startTime = System.currentTimeMillis();
+          if (currentStatus >= STATE_STOPPED_OK)
+          {
+            angle = 0;
+          }
 
-                    if (offscreen == null || offscreen.getWidth(this) != getWidth()
-                        || offscreen.getHeight(this) != getHeight())
-                    {
-                      offscreen = new BufferedImage(getWidth(), getHeight(),
-                                                    BufferedImage.TYPE_INT_ARGB);
-                      g = (Graphics2D) offscreen.getGraphics();
-                    }
-
-                    g.setColor(Color.white);
-                    g.fillRect(0, 0, getWidth(), getHeight());
+          repaint();
+        } catch (Exception ex)
+        {
+        }
+      }
 
-                    g.setFont(new Font("Arial", Font.BOLD, 12));
-                    g.setColor(Color.black);
+      cancel.setEnabled(false);
+    }
 
-                    switch (currentStatus)
-                    {
-                      case STATE_QUEUING:
-                        g.drawString(title.concat(" - queuing"), 60, 30);
+    void drawPanel()
+    {
+      if (offscreen == null || offscreen.getWidth(this) != getWidth()
+              || offscreen.getHeight(this) != getHeight())
+      {
+        offscreen = new BufferedImage(getWidth(), getHeight(),
+                BufferedImage.TYPE_INT_ARGB);
+      }
 
-                        break;
+      Graphics2D g = (Graphics2D) offscreen.getGraphics();
 
-                      case STATE_RUNNING:
-                        g.drawString(title.concat(" - running"), 60, 30);
+      g.setColor(Color.white);
+      g.fillRect(0, 0, getWidth(), getHeight());
 
-                        break;
+      g.setFont(new Font("Arial", Font.BOLD, 12));
+      g.setColor(Color.black);
 
-                      case STATE_STOPPED_OK:
-                        g.drawString(title.concat(" - complete"), 60, 30);
+      switch (currentStatus)
+      {
+      case STATE_QUEUING:
+        g.drawString(title.concat(" - queuing"), 60, 30);
 
-                        break;
+        break;
 
-                      case STATE_CANCELLED_OK:
-                        g.drawString(title.concat(" - job cancelled!"), 60, 30);
+      case STATE_RUNNING:
+        g.drawString(title.concat(" - running"), 60, 30);
 
-                        break;
+        break;
 
-                      case STATE_STOPPED_ERROR:
-                        g.drawString(title.concat(" - job error!"), 60, 30);
+      case STATE_STOPPED_OK:
+        g.drawString(title.concat(" - complete"), 60, 30);
 
-                        break;
+        break;
 
-                      case STATE_STOPPED_SERVERERROR:
-                        g.drawString(title.concat(" - Server Error! (try later)"),
-                                     60,
-                                     30);
+      case STATE_CANCELLED_OK:
+        g.drawString(title.concat(" - job cancelled!"), 60, 30);
 
-                        break;
-                    }
+        break;
 
+      case STATE_STOPPED_ERROR:
+        g.drawString(title.concat(" - job error!"), 60, 30);
 
-                    if (currentStatus >= STATE_STOPPED_OK)
-                      angle = 0;
+        break;
 
-                    if (image != null)
-                    {
-                      g.rotate(Math.toRadians(angle), 28, 28);
-                      g.drawImage(image, 10, 10, this);
-                      g.rotate( -Math.toRadians(angle), 28, 28);
-                    }
+      case STATE_STOPPED_SERVERERROR:
+        g.drawString(title.concat(" - Server Error! (try later)"), 60, 30);
 
+        break;
+      }
 
-                    repaint();
-                }
-                catch (Exception ex)
-                {
-                }
-            }
+      if (image != null)
+      {
+        g.rotate(Math.toRadians(angle), 28, 28);
+        g.drawImage(image, 10, 10, this);
+        g.rotate(-Math.toRadians(angle), 28, 28);
+      }
+    }
 
-            cancel.setEnabled(false);
-        }
+    public void paintComponent(Graphics g1)
+    {
+      drawPanel();
 
-        public void paintComponent(Graphics g1)
-        {
-            g1.drawImage(offscreen, 0,0,this);
-        }
+      g1.drawImage(offscreen, 0, 0, this);
     }
+  }
 }