JAL-3253 temporary branch SwingJS upgrade with testNG fixes Java 8
[jalview.git] / src / jalview / gui / Desktop.java
index b8f8eab..e13a63e 100644 (file)
  */
 package jalview.gui;
 
-import static jalview.util.UrlConstants.SEQUENCE_ID;
-
 import jalview.api.AlignViewportI;
 import jalview.api.AlignmentViewPanel;
+import jalview.api.StructureSelectionManagerProvider;
+import jalview.bin.ApplicationSingletonProvider;
+import jalview.bin.ApplicationSingletonProvider.ApplicationSingletonI;
 import jalview.bin.Cache;
 import jalview.bin.Jalview;
 import jalview.gui.ImageExporter.ImageWriterI;
+import jalview.io.BackupFiles;
 import jalview.io.DataSourceType;
 import jalview.io.FileFormat;
 import jalview.io.FileFormatException;
@@ -37,8 +39,10 @@ import jalview.io.FormatAdapter;
 import jalview.io.IdentifyFile;
 import jalview.io.JalviewFileChooser;
 import jalview.io.JalviewFileView;
+import jalview.jbgui.GDesktop;
 import jalview.jbgui.GSplitFrame;
 import jalview.jbgui.GStructureViewer;
+import jalview.project.Jalview2XML;
 import jalview.structure.StructureSelectionManager;
 import jalview.urls.IdOrgSettings;
 import jalview.util.BrowserLauncher;
@@ -46,8 +50,8 @@ import jalview.util.ImageMaker.TYPE;
 import jalview.util.MessageManager;
 import jalview.util.Platform;
 import jalview.util.UrlConstants;
-import jalview.util.dialogrunner.RunResponse;
 import jalview.viewmodel.AlignmentViewport;
+import jalview.ws.jws1.Discoverer;
 import jalview.ws.params.ParamManager;
 import jalview.ws.utils.UrlDownloadClient;
 
@@ -89,7 +93,6 @@ import java.util.ArrayList;
 import java.util.Hashtable;
 import java.util.List;
 import java.util.ListIterator;
-import java.util.StringTokenizer;
 import java.util.Vector;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
@@ -115,6 +118,7 @@ import javax.swing.JMenuItem;
 import javax.swing.JPanel;
 import javax.swing.JPopupMenu;
 import javax.swing.JProgressBar;
+import javax.swing.JTextField;
 import javax.swing.KeyStroke;
 import javax.swing.SwingUtilities;
 import javax.swing.event.HyperlinkEvent;
@@ -133,26 +137,28 @@ import org.stackoverflowusers.file.WindowsShortcut;
  * @author $author$
  * @version $Revision: 1.155 $
  */
-public class Desktop extends jalview.jbgui.GDesktop
+@SuppressWarnings("serial")
+public class Desktop extends GDesktop
         implements DropTargetListener, ClipboardOwner, IProgressIndicator,
-        jalview.api.StructureSelectionManagerProvider
+        StructureSelectionManagerProvider, ApplicationSingletonI
 {
-  private static int DEFAULT_MIN_WIDTH = 300;
 
-  private static int DEFAULT_MIN_HEIGHT = 250;
+  private final static int DEFAULT_MIN_WIDTH = 300;
+
+  private final static int DEFAULT_MIN_HEIGHT = 250;
 
-  private static int ALIGN_FRAME_DEFAULT_MIN_WIDTH = 600;
+  private final static int ALIGN_FRAME_DEFAULT_MIN_WIDTH = 600;
 
-  private static int ALIGN_FRAME_DEFAULT_MIN_HEIGHT = 70;
+  private final static int ALIGN_FRAME_DEFAULT_MIN_HEIGHT = 70;
 
-  private static final String EXPERIMENTAL_FEATURES = "EXPERIMENTAL_FEATURES";
+  private final static String EXPERIMENTAL_FEATURES = "EXPERIMENTAL_FEATURES";
 
   private JalviewChangeSupport changeSupport = new JalviewChangeSupport();
 
   /**
    * news reader - null if it was never started.
    */
-  private BlogReader jvnews = null;
+  BlogReader jvnews = null;
 
   private File projectFile;
 
@@ -191,16 +197,16 @@ public class Desktop extends jalview.jbgui.GDesktop
             listener);
   }
 
-  /** Singleton Desktop instance */
-  public static Desktop instance;
-
-  public static MyDesktopPane desktop;
+  public static MyDesktopPane getDesktopPane()
+  {
+    Desktop desktop = Desktop.getInstance();
+    return desktop == null ? null : desktop.desktopPane;
+  }
 
-  public static MyDesktopPane getDesktop()
+  public static StructureSelectionManager getStructureSelectionManager()
   {
-    // BH 2018 could use currentThread() here as a reference to a
-    // Hashtable<Thread, MyDesktopPane> in JavaScript
-    return desktop;
+    return StructureSelectionManager
+            .getStructureSelectionManager(getInstance());
   }
 
   static int openFrameCount = 0;
@@ -209,13 +215,17 @@ public class Desktop extends jalview.jbgui.GDesktop
 
   static final int yOffset = 30;
 
-  public static jalview.ws.jws1.Discoverer discoverer;
+  public Discoverer discoverer;
 
-  public static Object[] jalviewClipboard;
+  public Object[] jalviewClipboard;
 
-  public static boolean internalCopy = false;
+  public boolean internalCopy = false;
 
-  static int fileLoadingCount = 0;
+  private static int fileLoadingCount = 0;
+
+  public JInternalFrame conservationSlider;
+
+  public JInternalFrame PIDSlider;
 
   class MyDesktopManager implements DesktopManager
   {
@@ -236,7 +246,7 @@ public class Desktop extends jalview.jbgui.GDesktop
       } catch (NullPointerException npe)
       {
         Point p = getMousePosition();
-        instance.showPasteMenu(p.x, p.y);
+        showPasteMenu(p.x, p.y);
       }
     }
 
@@ -284,14 +294,14 @@ public class Desktop extends jalview.jbgui.GDesktop
     public void endDraggingFrame(JComponent f)
     {
       delegate.endDraggingFrame(f);
-      desktop.repaint();
+      desktopPane.repaint();
     }
 
     @Override
     public void endResizingFrame(JComponent f)
     {
       delegate.endResizingFrame(f);
-      desktop.repaint();
+      desktopPane.repaint();
     }
 
     @Override
@@ -340,166 +350,212 @@ public class Desktop extends jalview.jbgui.GDesktop
 
   }
 
+  public MyDesktopPane desktopPane;
+
   /**
-   * Creates a new Desktop object.
+   * Answers an 'application scope' singleton instance of this class. Separate
+   * SwingJS 'applets' running in the same browser page will each have a
+   * distinct instance of Desktop.
+   * 
+   * @return
    */
-  public Desktop()
+  public static Desktop getInstance()
   {
-    /**
-     * A note to implementors. It is ESSENTIAL that any activities that might block
-     * are spawned off as threads rather than waited for during this constructor.
-     */
-    instance = this;
-    if (!Jalview.isJS())
-    {
-      doVamsasClientCheck();
-    }
-
-    doConfigureStructurePrefs();
-    setTitle("Jalview " + jalview.bin.Cache.getProperty("VERSION"));
-    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
-    boolean selmemusage = jalview.bin.Cache.getDefault("SHOW_MEMUSAGE",
-            false);
-    boolean showjconsole = jalview.bin.Cache.getDefault("SHOW_JAVA_CONSOLE",
-            false);
-    desktop = new MyDesktopPane(selmemusage);
-    showMemusage.setSelected(selmemusage);
-    desktop.setBackground(Color.white);
-    getContentPane().setLayout(new BorderLayout());
-    // alternate config - have scrollbars - see notes in JAL-153
-    // JScrollPane sp = new JScrollPane();
-    // sp.getViewport().setView(desktop);
-    // getContentPane().add(sp, BorderLayout.CENTER);
-    getContentPane().add(desktop, BorderLayout.CENTER);
-    desktop.setDragMode(JDesktopPane.OUTLINE_DRAG_MODE);
-
-    // This line prevents Windows Look&Feel resizing all new windows to maximum
-    // if previous window was maximised
-    desktop.setDesktopManager(new MyDesktopManager(
-            (Platform.isWindows() ? new DefaultDesktopManager()
-                    : Platform.isAMac()
-                            ? new AquaInternalFrameManager(
-                                    desktop.getDesktopManager())
-                            : desktop.getDesktopManager())));
-
-    Rectangle dims = getLastKnownDimensions("");
-    if (dims != null)
-    {
-      setBounds(dims);
-    }
-    else
-    {
-      Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
-      int xPos = Math.max(5, (screenSize.width - 900) / 2);
-      int yPos = Math.max(5, (screenSize.height - 650) / 2);
-      setBounds(xPos, yPos, 900, 650);
-    }
-    /**
-     * BH 2018
-     * 
-     * @j2sNative
-     */
+    return Jalview.isHeadlessMode() ? null
+            : (Desktop) ApplicationSingletonProvider
+                    .getInstance(Desktop.class);
+  }
+  
+  /**
+   * Private constructor enforces singleton pattern. It is called by reflection
+   * from ApplicationSingletonProvider.getInstance().
+   */
+  private Desktop()
+  {
+    Cache.initLogger();
+    try
     {
+      /**
+       * A note to implementors. It is ESSENTIAL that any activities that might
+       * block are spawned off as threads rather than waited for during this
+       * constructor.
+       */
+      if (!Platform.isJS())
+      {
+        doVamsasClientCheck();
+      }
 
-      jconsole = new Console(this, showjconsole);
-      // add essential build information
-      jconsole.setHeader("Jalview Version: "
-              + jalview.bin.Cache.getProperty("VERSION") + "\n"
-              + "Jalview Installation: "
-              + jalview.bin.Cache.getDefault("INSTALLATION", "unknown")
-              + "\n" + "Build Date: "
-              + jalview.bin.Cache.getDefault("BUILD_DATE", "unknown") + "\n"
-              + "Java version: " + System.getProperty("java.version") + "\n"
-              + System.getProperty("os.arch") + " "
-              + System.getProperty("os.name") + " "
-              + System.getProperty("os.version"));
+      doConfigureStructurePrefs();
+      setTitle("Jalview " + jalview.bin.Cache.getProperty("VERSION"));
+      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+      boolean selmemusage = jalview.bin.Cache.getDefault("SHOW_MEMUSAGE",
+              false);
+      boolean showjconsole = jalview.bin.Cache
+              .getDefault("SHOW_JAVA_CONSOLE", false);
+      desktopPane = new MyDesktopPane(selmemusage);
 
-      showConsole(showjconsole);
+      showMemusage.setSelected(selmemusage);
+      desktopPane.setBackground(Color.white);
+      getContentPane().setLayout(new BorderLayout());
+      // alternate config - have scrollbars - see notes in JAL-153
+      // JScrollPane sp = new JScrollPane();
+      // sp.getViewport().setView(desktop);
+      // getContentPane().add(sp, BorderLayout.CENTER);
 
-      showNews.setVisible(false);
+      // BH 2018 - just an experiment to try unclipped JInternalFrames.
+      if (Platform.isJS())
+      {
+        getRootPane().putClientProperty("swingjs.overflow.hidden", "false");
+      }
 
-      experimentalFeatures.setSelected(showExperimental());
+      getContentPane().add(desktopPane, BorderLayout.CENTER);
+      desktopPane.setDragMode(JDesktopPane.OUTLINE_DRAG_MODE);
 
-      getIdentifiersOrgData();
+      // This line prevents Windows Look&Feel resizing all new windows to
+      // maximum
+      // if previous window was maximised
+      desktopPane.setDesktopManager(new MyDesktopManager(
+              (Platform.isWindowsAndNotJS() ? new DefaultDesktopManager()
+                      : Platform.isAMacAndNotJS()
+                              ? new AquaInternalFrameManager(
+                                      desktopPane.getDesktopManager())
+                              : desktopPane.getDesktopManager())));
 
-      checkURLLinks();
+      Rectangle dims = getLastKnownDimensions("");
+      if (dims != null)
+      {
+        setBounds(dims);
+      }
+      else
+      {
+        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
+        int xPos = Math.max(5, (screenSize.width - 900) / 2);
+        int yPos = Math.max(5, (screenSize.height - 650) / 2);
+        setBounds(xPos, yPos, 900, 650);
+      }
 
-      // Spawn a thread that shows the splashscreen
+      // Note that this next syntax, checking for Platform.isJS and also
+      // escaping the code using @j2sIgnore, serves two purposes. It gives
+      // us an easily findable tag, Platform.isJS(), to places in the code where
+      // there is something different about the SwingJS implementation. Second,
+      // it deletes the unneeded Java-only code form the JavaScript version
+      // completely (@j2sIgnore), since it will never be used there.
 
-      SwingUtilities.invokeLater(new Runnable()
+      if (!Platform.isJS() && !Jalview.isSynchronous())
+      /**
+       * Java only
+       * 
+       * @j2sIgnore
+       */
       {
-        @Override
-        public void run()
-        {
-          new SplashScreen();
-        }
-      });
 
-      // Thread off a new instance of the file chooser - this reduces the time it
-      // takes to open it later on.
-      new Thread(new Runnable()
-      {
-        @Override
-        public void run()
+        jconsole = new Console(this, showjconsole);
+        // add essential build information
+        jconsole.setHeader("Jalview Version: "
+                + jalview.bin.Cache.getProperty("VERSION") + "\n"
+                + "Jalview Installation: "
+                + jalview.bin.Cache.getDefault("INSTALLATION", "unknown")
+                + "\n" + "Build Date: "
+                + jalview.bin.Cache.getDefault("BUILD_DATE", "unknown")
+                + "\n" + "Java version: "
+                + System.getProperty("java.version") + "\n"
+                + System.getProperty("os.arch") + " "
+                + System.getProperty("os.name") + " "
+                + System.getProperty("os.version"));
+
+        showConsole(showjconsole);
+
+        showNews.setVisible(false);
+
+        experimentalFeatures.setSelected(showExperimental());
+
+        getIdentifiersOrgData();
+
+        checkURLLinks();
+
+        // Spawn a thread that shows the splashscreen
+
+        SwingUtilities.invokeLater(new Runnable()
         {
-          Cache.log.debug("Filechooser init thread started.");
-          String fileFormat = Cache.getProperty("DEFAULT_FILE_FORMAT");
-          JalviewFileChooser.forRead(Cache.getProperty("LAST_DIRECTORY"),
-                  fileFormat);
-          Cache.log.debug("Filechooser init thread finished.");
-        }
-      }).start();
-      // Add the service change listener
-      changeSupport.addJalviewPropertyChangeListener("services",
-              new PropertyChangeListener()
-              {
+          @Override
+          public void run()
+          {
+            new SplashScreen();
+          }
+        });
 
-                @Override
-                public void propertyChange(PropertyChangeEvent evt)
+        // Thread off a new instance of the file chooser - this reduces the time
+        // it
+        // takes to open it later on.
+        new Thread(new Runnable()
+        {
+          @Override
+          public void run()
+          {
+            Cache.log.debug("Filechooser init thread started.");
+            String fileFormat = Cache.getProperty("DEFAULT_FILE_FORMAT");
+            JalviewFileChooser.forRead(Cache.getProperty("LAST_DIRECTORY"),
+                    fileFormat);
+            Cache.log.debug("Filechooser init thread finished.");
+          }
+        }).start();
+        // Add the service change listener
+        changeSupport.addJalviewPropertyChangeListener("services",
+                new PropertyChangeListener()
                 {
-                  Cache.log.debug("Firing service changed event for "
-                          + evt.getNewValue());
-                  JalviewServicesChanged(evt);
-                }
 
-              });
-
-    } // end BH 2018 ignore
+                  @Override
+                  public void propertyChange(PropertyChangeEvent evt)
+                  {
+                    Cache.log.debug("Firing service changed event for "
+                            + evt.getNewValue());
+                    JalviewServicesChanged(evt);
+                  }
 
-    this.setDropTarget(new java.awt.dnd.DropTarget(desktop, this));
+                });
 
-    this.addWindowListener(new WindowAdapter()
-    {
-      @Override
-      public void windowClosing(WindowEvent evt)
-      {
-        quit();
       }
-    });
 
-    MouseAdapter ma;
-    this.addMouseListener(ma = new MouseAdapter()
-    {
-      @Override
-      public void mousePressed(MouseEvent evt)
+      if (!Jalview.isSynchronous())
       {
-        if (evt.isPopupTrigger()) // Mac
+        this.setDropTarget(new java.awt.dnd.DropTarget(desktopPane, this));
+
+        this.addWindowListener(new WindowAdapter()
         {
-          showPasteMenu(evt.getX(), evt.getY());
-        }
-      }
+          @Override
+          public void windowClosing(WindowEvent evt)
+          {
+            quit();
+          }
+        });
 
-      @Override
-      public void mouseReleased(MouseEvent evt)
-      {
-        if (evt.isPopupTrigger()) // Windows
+        MouseAdapter ma;
+        this.addMouseListener(ma = new MouseAdapter()
         {
-          showPasteMenu(evt.getX(), evt.getY());
-        }
-      }
-    });
-    desktop.addMouseListener(ma);
+          @Override
+          public void mousePressed(MouseEvent evt)
+          {
+            if (evt.isPopupTrigger()) // Mac
+            {
+              showPasteMenu(evt.getX(), evt.getY());
+            }
+          }
 
+          @Override
+          public void mouseReleased(MouseEvent evt)
+          {
+            if (evt.isPopupTrigger()) // Windows
+            {
+              showPasteMenu(evt.getX(), evt.getY());
+            }
+          }
+        });
+        desktopPane.addMouseListener(ma);
+      }
+    } catch (Throwable t)
+    {
+      t.printStackTrace();
+    }
   }
 
   /**
@@ -541,7 +597,7 @@ public class Desktop extends jalview.jbgui.GDesktop
   {
     final Desktop me = this;
     // Thread off the news reader, in case there are connection problems.
-    addDialogThread(new Runnable()
+    new Thread(new Runnable()
     {
       @Override
       public void run()
@@ -551,22 +607,22 @@ public class Desktop extends jalview.jbgui.GDesktop
         showNews.setVisible(true);
         Cache.log.debug("Completed news thread.");
       }
-    });
+    }).start();
   }
 
   public void getIdentifiersOrgData()
   {
     // Thread off the identifiers fetcher
-    addDialogThread(new Runnable()
+    new Thread(new Runnable()
     {
       @Override
       public void run()
       {
         Cache.log.debug("Downloading data from identifiers.org");
-        UrlDownloadClient client = new UrlDownloadClient();
+        // UrlDownloadClient client = new UrlDownloadClient();
         try
         {
-          client.download(IdOrgSettings.getUrl(),
+          UrlDownloadClient.download(IdOrgSettings.getUrl(),
                   IdOrgSettings.getDownloadLocation());
         } catch (IOException e)
         {
@@ -574,7 +630,8 @@ public class Desktop extends jalview.jbgui.GDesktop
                   + e.getMessage());
         }
       }
-    });
+    }).start();
+    
   }
 
   @Override
@@ -583,7 +640,7 @@ public class Desktop extends jalview.jbgui.GDesktop
     showNews(showNews.isSelected());
   }
 
-  void showNews(boolean visible)
+  protected void showNews(boolean visible)
   {
     Cache.log.debug((visible ? "Showing" : "Hiding") + " news.");
     showNews.setSelected(visible);
@@ -595,10 +652,10 @@ public class Desktop extends jalview.jbgui.GDesktop
         public void run()
         {
           long now = System.currentTimeMillis();
-          Desktop.instance.setProgressBar(
+          setProgressBar(
                   MessageManager.getString("status.refreshing_news"), now);
           jvnews.refreshNews();
-          Desktop.instance.setProgressBar(null, now);
+          setProgressBar(null, now);
           jvnews.showNews();
         }
       }).start();
@@ -703,7 +760,7 @@ public class Desktop extends jalview.jbgui.GDesktop
     }
   }
 
-  void showPasteMenu(int x, int y)
+  protected void showPasteMenu(int x, int y)
   {
     JPopupMenu popup = new JPopupMenu();
     JMenuItem item = new JMenuItem(
@@ -736,7 +793,7 @@ public class Desktop extends jalview.jbgui.GDesktop
         FileFormatI format = new IdentifyFile().identify(file,
                 DataSourceType.PASTE);
 
-        new FileLoader().LoadFile(file, DataSourceType.PASTE, format);
+        new FileLoader().loadFile(file, DataSourceType.PASTE, format);
 
       }
     } catch (Exception ex)
@@ -831,13 +888,14 @@ public class Desktop extends jalview.jbgui.GDesktop
           int w, int h, boolean resizable, boolean ignoreMinSize)
   {
 
+
     // TODO: allow callers to determine X and Y position of frame (eg. via
     // bounds object).
     // TODO: consider fixing method to update entries in the window submenu with
     // the current window title
 
     frame.setTitle(title);
-    if (frame.getWidth() < 1 || frame.getHeight() < 1)
+    if (w > 0 && (frame.getWidth() < 1 || frame.getHeight() < 1))
     {
       frame.setSize(w, h);
     }
@@ -845,8 +903,7 @@ public class Desktop extends jalview.jbgui.GDesktop
     // A HEADLESS STATE WHEN NO DESKTOP EXISTS. MUST RETURN
     // IF JALVIEW IS RUNNING HEADLESS
     // ///////////////////////////////////////////////
-    if (instance == null || (System.getProperty("java.awt.headless") != null
-            && System.getProperty("java.awt.headless").equals("true")))
+    if (Jalview.isHeadlessMode())
     {
       return;
     }
@@ -874,10 +931,10 @@ public class Desktop extends jalview.jbgui.GDesktop
     frame.setResizable(resizable);
     frame.setMaximizable(resizable);
     frame.setIconifiable(resizable);
-    frame.setOpaque(/** @j2sNative true || */
-            false);
+    frame.setOpaque(Platform.isJS());
 
-    if (frame.getX() < 1 && frame.getY() < 1)
+    boolean isEmbedded = (Platform.getDimIfEmbedded(frame, -1, -1) != null);
+    if (!isEmbedded && frame.getX() < 1 && frame.getY() < 1)
     {
       frame.setLocation(xOffset * openFrameCount,
               yOffset * ((openFrameCount - 1) % 10) + yOffset);
@@ -887,13 +944,13 @@ public class Desktop extends jalview.jbgui.GDesktop
      * add an entry for the new frame in the Window menu 
      * (and remove it when the frame is closed)
      */
-    final JMenuItem menuItem = new JMenuItem(title);
+    JMenuItem menuItem = new JMenuItem(title);
     frame.addInternalFrameListener(new InternalFrameAdapter()
     {
       @Override
       public void internalFrameActivated(InternalFrameEvent evt)
       {
-        JInternalFrame itf = desktop.getSelectedFrame();
+        JInternalFrame itf = getDesktopPane().getSelectedFrame();
         if (itf != null)
         {
           if (itf instanceof AlignFrame)
@@ -925,8 +982,8 @@ public class Desktop extends jalview.jbgui.GDesktop
         {
           menuItem.removeActionListener(menuItem.getActionListeners()[0]);
         }
-        windowMenu.remove(menuItem);
-      };
+        Desktop.getInstance().windowMenu.remove(menuItem);
+      }
     });
 
     menuItem.addActionListener(new ActionListener()
@@ -947,9 +1004,9 @@ public class Desktop extends jalview.jbgui.GDesktop
 
     setKeyBindings(frame);
 
-    desktop.add(frame);
+    getDesktopPane().add(frame);
 
-    windowMenu.add(menuItem);
+    Desktop.getInstance().windowMenu.add(menuItem);
 
     frame.toFront();
     try
@@ -974,7 +1031,6 @@ public class Desktop extends jalview.jbgui.GDesktop
    */
   private static void setKeyBindings(JInternalFrame frame)
   {
-    @SuppressWarnings("serial")
     final Action closeAction = new AbstractAction()
     {
       @Override
@@ -1007,7 +1063,7 @@ public class Desktop extends jalview.jbgui.GDesktop
   {
     if (!internalCopy)
     {
-      Desktop.jalviewClipboard = null;
+      Desktop.getInstance().jalviewClipboard = null;
     }
 
     internalCopy = false;
@@ -1082,8 +1138,11 @@ public class Desktop extends jalview.jbgui.GDesktop
           {
             format = new IdentifyFile().identify(file, protocol);
           }
-
-          new FileLoader().LoadFile(null, file, protocol, format);
+          if (file instanceof File)
+          {
+            Platform.cacheFileData((File) file);
+          }
+          new FileLoader().loadFile(null, file, protocol, format);
 
         }
       } catch (Exception ex)
@@ -1106,16 +1165,15 @@ public class Desktop extends jalview.jbgui.GDesktop
   {
     String fileFormat = Cache.getProperty("DEFAULT_FILE_FORMAT");
     JalviewFileChooser chooser = JalviewFileChooser
-            .forRead(Cache.getProperty("LAST_DIRECTORY"), fileFormat);
+            .forRead(Cache.getProperty("LAST_DIRECTORY"), fileFormat, true);
 
     chooser.setFileView(new JalviewFileView());
     chooser.setDialogTitle(
             MessageManager.getString("label.open_local_file"));
     chooser.setToolTipText(MessageManager.getString("action.open"));
 
-    chooser.response(new RunResponse(JalviewFileChooser.APPROVE_OPTION)
+    chooser.setResponseHandler(0, new Runnable()
     {
-
       @Override
       public void run()
       {
@@ -1141,17 +1199,17 @@ public class Desktop extends jalview.jbgui.GDesktop
           }
         }
 
-        new FileLoader().LoadFile(viewport, selectedFile,
+        new FileLoader().loadFile(viewport, selectedFile,
                 DataSourceType.FILE, format);
       }
-    }).openDialog(this);
+    });
+    chooser.showOpenDialog(this);
   }
 
   /**
-   * DOCUMENT ME!
+   * Shows a dialog for input of a URL at which to retrieve alignment data
    * 
-   * @param e
-   *          DOCUMENT ME!
+   * @param viewport
    */
   @Override
   public void inputURLMenuItem_actionPerformed(AlignViewport viewport)
@@ -1161,46 +1219,113 @@ public class Desktop extends jalview.jbgui.GDesktop
     JLabel label = new JLabel(
             MessageManager.getString("label.input_file_url"));
 
-    JComboBox history = new JComboBox();
     JPanel panel = new JPanel(new GridLayout(2, 1));
     panel.add(label);
-    panel.add(history);
-    history.setPreferredSize(new Dimension(400, 20));
-    history.setEditable(true);
-    history.addItem("http://www.");
-
-    String historyItems = jalview.bin.Cache.getProperty("RECENT_URL");
 
-    StringTokenizer st;
-
-    if (historyItems != null)
+    /*
+     * the URL to fetch is
+     * Java: an editable combobox with history
+     * JS: (pending JAL-3038) a plain text field
+     */
+    JComponent history;
+    String urlBase = "http://www.";
+    if (Platform.isJS())
     {
-      st = new StringTokenizer(historyItems, "\t");
-
-      while (st.hasMoreTokens())
+      history = new JTextField(urlBase, 35);
+    }
+    else
+    /**
+     * Java only
+     * 
+     * @j2sIgnore
+     */
+    {
+      JComboBox<String> asCombo = new JComboBox<>();
+      asCombo.setPreferredSize(new Dimension(400, 20));
+      asCombo.setEditable(true);
+      asCombo.addItem(urlBase);
+      String historyItems = Cache.getProperty("RECENT_URL");
+      if (historyItems != null)
       {
-        history.addItem(st.nextElement());
+        for (String token : historyItems.split("\\t"))
+        {
+          asCombo.addItem(token);
+        }
       }
+      history = asCombo;
     }
+    panel.add(history);
 
-    // BH 2018 -- providing a callback for SwingJS
-    // dialogOption is just a simple way to provide
-    // context for the modal-like response.
-    // The only requirement is that desktop implement
-    // PropertyChangeListener, which is used already in Java
-    // for changes in input value and such within the dialogs.
+    Object[] options = new Object[] { MessageManager.getString("action.ok"),
+        MessageManager.getString("action.cancel") };
+    Runnable action = new Runnable()
+    {
+      @Override
+      public void run()
+      {
+        @SuppressWarnings("unchecked")
+        String url = (history instanceof JTextField
+                ? ((JTextField) history).getText()
+                : ((JComboBox<String>) history).getSelectedItem()
+                        .toString());
 
-    String dialogOption = "label.input_alignment_from_url";
-    desktop.dialogData = new Object[] { dialogOption, viewport, history };
-    desktop.onDialogReturn(JvOptionPane.showInternalConfirmDialog(desktop,
-            panel, MessageManager.getString(dialogOption),
-            JvOptionPane.OK_CANCEL_OPTION));
+        if (url.toLowerCase().endsWith(".jar"))
+        {
+          if (viewport != null)
+          {
+            new FileLoader().loadFile(viewport, url, DataSourceType.URL,
+                    FileFormat.Jalview);
+          }
+          else
+          {
+            new FileLoader().loadFile(url, DataSourceType.URL,
+                    FileFormat.Jalview);
+          }
+        }
+        else
+        {
+          FileFormatI format = null;
+          try
+          {
+            format = new IdentifyFile().identify(url, DataSourceType.URL);
+          } catch (FileFormatException e)
+          {
+            // TODO revise error handling, distinguish between
+            // URL not found and response not valid
+          }
 
-    // no code may follow this, as SwingJS will not block
-    // callback in JavaScript comes via a property change event,
-    // thus going into desktop.onDialogReturn(int) just the same as
-    // in Java.
+          if (format == null)
+          {
+            String msg = MessageManager
+                    .formatMessage("label.couldnt_locate", url);
+            JvOptionPane.showInternalMessageDialog(Desktop.getDesktopPane(),
+                    msg,
+                    MessageManager.getString("label.url_not_found"),
+                    JvOptionPane.WARNING_MESSAGE);
 
+            return;
+          }
+
+          if (viewport != null)
+          {
+            new FileLoader().loadFile(viewport, url, DataSourceType.URL,
+                    format);
+          }
+          else
+          {
+            new FileLoader().loadFile(url, DataSourceType.URL, format);
+          }
+        }
+      }
+    };
+    String dialogOption = MessageManager
+            .getString("label.input_alignment_from_url");
+    JvOptionPane.newOptionDialog(getDesktopPane())
+            .setResponseHandler(0, action)
+            .showInternalDialog(panel, dialogOption,
+                    JvOptionPane.YES_NO_CANCEL_OPTION,
+                    JvOptionPane.PLAIN_MESSAGE, null, options,
+                    MessageManager.getString("action.ok"));
   }
 
   /**
@@ -1282,7 +1407,7 @@ public class Desktop extends jalview.jbgui.GDesktop
   public void aboutMenuItem_actionPerformed(ActionEvent e)
   {
     // StringBuffer message = getAboutMessage(false);
-    // JvOptionPane.showInternalMessageDialog(Desktop.desktop,
+    // JvOptionPane.showInternalMessageDialog(Desktop.getDesktop(),
     //
     // message.toString(), "About Jalview", JvOptionPane.INFORMATION_MESSAGE);
     new Thread(new Runnable()
@@ -1369,11 +1494,16 @@ public class Desktop extends jalview.jbgui.GDesktop
   {
     try
     {
-      if (Jalview.isJS())
+      if (Platform.isJS())
       {
         BrowserLauncher.openURL("http://www.jalview.org/help.html");
       }
       else
+      /**
+       * Java only
+       * 
+       * @j2sIgnore
+       */
       {
         Help.showHelpWindow();
       }
@@ -1386,8 +1516,12 @@ public class Desktop extends jalview.jbgui.GDesktop
   @Override
   public void closeAll_actionPerformed(ActionEvent e)
   {
+    if (desktopPane == null)
+    {
+      return;
+    }
     // TODO show a progress bar while closing?
-    JInternalFrame[] frames = desktop.getAllFrames();
+    JInternalFrame[] frames = desktopPane.getAllFrames();
     for (int i = 0; i < frames.length; i++)
     {
       try
@@ -1408,12 +1542,7 @@ public class Desktop extends jalview.jbgui.GDesktop
      * reset state of singleton objects as appropriate (clear down session state
      * when all windows are closed)
      */
-    StructureSelectionManager ssm = StructureSelectionManager
-            .getStructureSelectionManager(this);
-    if (ssm != null)
-    {
-      ssm.resetAll();
-    }
+    getStructureSelectionManager().resetAll();
   }
 
   @Override
@@ -1458,7 +1587,7 @@ public class Desktop extends jalview.jbgui.GDesktop
   @Override
   protected void showMemusage_actionPerformed(ActionEvent e)
   {
-    desktop.showMemoryUsage(showMemusage.isSelected());
+    getDesktopPane().showMemoryUsage(showMemusage.isSelected());
   }
 
   /*
@@ -1495,7 +1624,7 @@ public class Desktop extends jalview.jbgui.GDesktop
 
   void reorderAssociatedWindows(boolean minimize, boolean close)
   {
-    JInternalFrame[] frames = desktop.getAllFrames();
+    JInternalFrame[] frames = getDesktopPane().getAllFrames();
     if (frames == null || frames.length < 1)
     {
       return;
@@ -1589,20 +1718,43 @@ public class Desktop extends jalview.jbgui.GDesktop
   @Override
   public void saveState_actionPerformed()
   {
-    JalviewFileChooser chooser = new JalviewFileChooser("jvp",
-            "Jalview Project");
+    saveState_actionPerformed(false);
+  }
 
-    chooser.setFileView(new JalviewFileView());
-    chooser.setDialogTitle(MessageManager.getString("label.save_state"));
+  public void saveState_actionPerformed(boolean saveAs)
+  {
+    java.io.File projectFile = getProjectFile();
+    // autoSave indicates we already have a file and don't need to ask
+    boolean autoSave = projectFile != null && !saveAs
+            && BackupFiles.getEnabled();
 
-    int value = chooser.showSaveDialog(this);
+    // System.out.println("autoSave="+autoSave+", projectFile='"+projectFile+"',
+    // saveAs="+saveAs+", Backups
+    // "+(BackupFiles.getEnabled()?"enabled":"disabled"));
 
-    if (value == JalviewFileChooser.APPROVE_OPTION)
+    boolean approveSave = false;
+    if (!autoSave)
     {
-      final Desktop me = this;
-      final java.io.File choice = chooser.getSelectedFile();
-      setProjectFile(choice);
+      JalviewFileChooser chooser = new JalviewFileChooser("jvp",
+              "Jalview Project");
+
+      chooser.setFileView(new JalviewFileView());
+      chooser.setDialogTitle(MessageManager.getString("label.save_state"));
+
+      int value = chooser.showSaveDialog(this);
+
+      if (value == JalviewFileChooser.APPROVE_OPTION)
+      {
+        projectFile = chooser.getSelectedFile();
+        setProjectFile(projectFile);
+        approveSave = true;
+      }
+    }
 
+    if (approveSave || autoSave)
+    {
+      final Desktop me = this;
+      final java.io.File chosenFile = projectFile;
       new Thread(new Runnable()
       {
         @Override
@@ -1611,39 +1763,52 @@ public class Desktop extends jalview.jbgui.GDesktop
           // TODO: refactor to Jalview desktop session controller action.
           setProgressBar(MessageManager.formatMessage(
                   "label.saving_jalview_project", new Object[]
-                  { choice.getName() }), choice.hashCode());
+                  { chosenFile.getName() }), chosenFile.hashCode());
           jalview.bin.Cache.setProperty("LAST_DIRECTORY",
-                  choice.getParent());
+                  chosenFile.getParent());
           // TODO catch and handle errors for savestate
           // TODO prevent user from messing with the Desktop whilst we're saving
           try
           {
-            new Jalview2XML().saveState(choice);
+               boolean doBackup = BackupFiles.getEnabled();
+            BackupFiles backupfiles = doBackup ? new BackupFiles(chosenFile) : null;
+
+            new Jalview2XML().saveState(doBackup ? backupfiles.getTempFile() : chosenFile);
+
+            if (doBackup)
+            {
+              backupfiles.setWriteSuccess(true);
+              backupfiles.rollBackupsAndRenameTempFile();
+            }
           } catch (OutOfMemoryError oom)
           {
-            new OOMWarning(
-                    "Whilst saving current state to " + choice.getName(),
-                    oom);
+            new OOMWarning("Whilst saving current state to "
+                    + chosenFile.getName(), oom);
           } catch (Exception ex)
           {
-            Cache.log.error(
-                    "Problems whilst trying to save to " + choice.getName(),
-                    ex);
+            Cache.log.error("Problems whilst trying to save to "
+                    + chosenFile.getName(), ex);
             JvOptionPane.showMessageDialog(me,
                     MessageManager.formatMessage(
                             "label.error_whilst_saving_current_state_to",
                             new Object[]
-                            { choice.getName() }),
+                            { chosenFile.getName() }),
                     MessageManager.getString("label.couldnt_save_project"),
                     JvOptionPane.WARNING_MESSAGE);
           }
-          setProgressBar(null, choice.hashCode());
+          setProgressBar(null, chosenFile.hashCode());
         }
       }).start();
-    }
+      }
+  }
+
+  @Override
+  public void saveAsState_actionPerformed(ActionEvent e)
+  {
+    saveState_actionPerformed(true);
   }
 
-  private void setProjectFile(File choice)
+  protected void setProjectFile(File choice)
   {
     this.projectFile = choice;
   }
@@ -1654,58 +1819,59 @@ public class Desktop extends jalview.jbgui.GDesktop
   }
 
   /**
-   * Prompts the user to choose a file and loads in as a Jalview project file
+   * Shows a file chooser dialog and tries to read in the selected file as a
+   * Jalview project
    */
   @Override
   public void loadState_actionPerformed()
   {
+    final String[] suffix = new String[] { "jvp", "jar" };
+    final String[] desc = new String[] { "Jalview Project",
+        "Jalview Project (old)" };
     JalviewFileChooser chooser = new JalviewFileChooser(
-            Cache.getProperty("LAST_DIRECTORY"), new String[]
-            { "jvp", "jar" },
-            new String[]
-            { "Jalview Project", "Jalview Project (old)" },
-            "Jalview Project");
+            Cache.getProperty("LAST_DIRECTORY"), suffix, desc,
+            "Jalview Project", true, true); // last two booleans: allFiles,
+                                            // allowBackupFiles
     chooser.setFileView(new JalviewFileView());
     chooser.setDialogTitle(MessageManager.getString("label.restore_state"));
-
-    int value = chooser.showOpenDialog(this);
-
-    if (value == JalviewFileChooser.APPROVE_OPTION)
+    chooser.setResponseHandler(0, new Runnable()
     {
-      final File selectedFile = chooser.getSelectedFile();
-      setProjectFile(selectedFile);
-      final String choice = selectedFile.getAbsolutePath();
-      Cache.setProperty("LAST_DIRECTORY", selectedFile.getParent());
-      new Thread(new Runnable()
+      @Override
+      public void run()
       {
-        @Override
-        public void run()
+        File selectedFile = chooser.getSelectedFile();
+        setProjectFile(selectedFile);
+        String choice = selectedFile.getAbsolutePath();
+        Cache.setProperty("LAST_DIRECTORY", selectedFile.getParent());
+        new Thread(new Runnable()
         {
-          setProgressBar(MessageManager.formatMessage(
-                  "label.loading_jalview_project", new Object[]
-                  { choice }), choice.hashCode());
-          try
+          @Override
+          public void run()
           {
-            new Jalview2XML().loadJalviewAlign(choice);
-          } catch (OutOfMemoryError oom)
-          {
-            new OOMWarning("Whilst loading project from " + choice, oom);
-          } catch (Exception ex)
-          {
-            Cache.log.error(
-                    "Problems whilst loading project from " + choice, ex);
-            JvOptionPane.showMessageDialog(Desktop.desktop,
-                    MessageManager.formatMessage(
-                            "label.error_whilst_loading_project_from",
-                            new Object[]
-                            { choice }),
-                    MessageManager.getString("label.couldnt_load_project"),
-                    JvOptionPane.WARNING_MESSAGE);
+               try 
+            {
+              new Jalview2XML().loadJalviewAlign(selectedFile);
+            } catch (OutOfMemoryError oom)
+               {
+                 new OOMWarning("Whilst loading project from " + choice, oom);
+               } catch (Exception ex)
+               {
+                 Cache.log.error(
+                         "Problems whilst loading project from " + choice, ex);
+              JvOptionPane.showMessageDialog(Desktop.getDesktopPane(),
+                         MessageManager.formatMessage(
+                                 "label.error_whilst_loading_project_from",
+                               new Object[]
+                                   { choice }),
+                         MessageManager.getString("label.couldnt_load_project"),
+                         JvOptionPane.WARNING_MESSAGE);
+               }
           }
-          setProgressBar(null, choice.hashCode());
-        }
-      }).start();
-    }
+        }).start();
+      }
+    });
+    
+    chooser.showOpenDialog(this);
   }
 
   @Override
@@ -1735,7 +1901,7 @@ public class Desktop extends jalview.jbgui.GDesktop
     {
       progressPanel = new JPanel(new GridLayout(1, 1));
       totalProgressCount = 0;
-      instance.getContentPane().add(progressPanel, BorderLayout.SOUTH);
+      getContentPane().add(progressPanel, BorderLayout.SOUTH);
     }
     JPanel thisprogress = new JPanel(new BorderLayout(10, 5));
     JProgressBar progressBar = new JProgressBar();
@@ -1748,7 +1914,7 @@ public class Desktop extends jalview.jbgui.GDesktop
     ((GridLayout) progressPanel.getLayout()).setRows(
             ((GridLayout) progressPanel.getLayout()).getRows() + 1);
     ++totalProgressCount;
-    instance.validate();
+    validate();
     return thisprogress;
   }
 
@@ -1802,7 +1968,7 @@ public class Desktop extends jalview.jbgui.GDesktop
    */
   public static AlignmentPanel[] getAlignmentPanels(String alignmentId)
   {
-    if (Desktop.desktop == null)
+    if (Desktop.getDesktopPane() == null)
     {
       // no frames created and in headless mode
       // TODO: verify that frames are recoverable when in headless mode
@@ -1844,7 +2010,7 @@ public class Desktop extends jalview.jbgui.GDesktop
   public static AlignmentViewport[] getViewports(String sequenceSetId)
   {
     List<AlignmentViewport> viewp = new ArrayList<>();
-    if (desktop != null)
+    if (getDesktopPane() != null)
     {
       AlignFrame[] frames = Desktop.getAlignFrames();
 
@@ -1930,7 +2096,7 @@ public class Desktop extends jalview.jbgui.GDesktop
   {
     source.viewport.setGatherViewsHere(true);
     source.viewport.setExplodedGeometry(source.getBounds());
-    JInternalFrame[] frames = desktop.getAllFrames();
+    JInternalFrame[] frames = getAllFrames();
     String viewId = source.viewport.getSequenceSetId();
 
     for (int t = 0; t < frames.length; t++)
@@ -1987,7 +2153,7 @@ public class Desktop extends jalview.jbgui.GDesktop
         String fle = chooser.getSelectedFile().toString();
         if (!vamsasImport(chooser.getSelectedFile()))
         {
-          JvOptionPane.showInternalMessageDialog(Desktop.desktop,
+          JvOptionPane.showInternalMessageDialog(Desktop.getDesktopPane(),
                   MessageManager.formatMessage(
                           "label.couldnt_import_as_vamsas_session",
                           new Object[]
@@ -2219,7 +2385,7 @@ public class Desktop extends jalview.jbgui.GDesktop
                 });
                 rthr.start();
               }
-            };
+            }
           });
           VamsasStMenu.add(sessit);
         }
@@ -2288,7 +2454,7 @@ public class Desktop extends jalview.jbgui.GDesktop
         removeProgressPanel(progpanel);
         if (warnmsg != null)
         {
-          JvOptionPane.showInternalMessageDialog(Desktop.desktop,
+          JvOptionPane.showInternalMessageDialog(Desktop.getDesktopPane(),
 
                   warnmsg, warnttl, JvOptionPane.ERROR_MESSAGE);
         }
@@ -2325,7 +2491,7 @@ public class Desktop extends jalview.jbgui.GDesktop
 
   public JInternalFrame[] getAllFrames()
   {
-    return desktop.getAllFrames();
+    return desktopPane.getAllFrames();
   }
 
   /**
@@ -2364,7 +2530,7 @@ public class Desktop extends jalview.jbgui.GDesktop
           while (li.hasNext())
           {
             String link = li.next();
-            if (link.contains(SEQUENCE_ID)
+            if (link.contains(UrlConstants.SEQUENCE_ID)
                     && !UrlConstants.isDefaultString(link))
             {
               check = true;
@@ -2411,7 +2577,7 @@ public class Desktop extends jalview.jbgui.GDesktop
           });
           msgPanel.add(jcb);
 
-          JvOptionPane.showMessageDialog(Desktop.desktop, msgPanel,
+          JvOptionPane.showMessageDialog(desktopPane, msgPanel,
                   MessageManager
                           .getString("label.SEQUENCE_ID_no_longer_used"),
                   JvOptionPane.WARNING_MESSAGE);
@@ -2427,149 +2593,8 @@ public class Desktop extends jalview.jbgui.GDesktop
    * @author AMW
    */
   public class MyDesktopPane extends JDesktopPane
-          implements Runnable, PropertyChangeListener
+          implements Runnable
   {
-
-    public Object[] dialogData;
-
-    // @Override
-    @Override
-    public void propertyChange(PropertyChangeEvent event)
-    {
-      // TODO this is obsolete with JAL-3048 - delete?
-      Object val = event.getNewValue();
-      String name = event.getPropertyName();
-      System.out.println(name);
-      switch (event.getSource().getClass().getName())
-      {
-      case "javax.swing.JOptionPane":
-        switch (name)
-        {
-        case "inputValue":
-          onDialogReturn(val);
-          return;
-        case "value":
-          if (val instanceof Integer)
-          {
-            onDialogReturn(((Integer) val).intValue());
-          }
-          else
-          {
-            onDialogReturn(val);
-          }
-          return;
-        }
-        break;
-      case "javax.swing.JFileChooser":
-        switch (name)
-        {
-        case "SelectedFile":
-          // in JavaScript, this File object will have a _bytes property,
-          // because the file data has already been loaded
-          onDialogReturn(new Object[] { (File) val });
-          return;
-        }
-        break;
-      }
-      System.out.println(event.getSource().getClass().getName() + " "
-              + event.getPropertyName() + ": " + event.getNewValue());
-    }
-
-    // JSCOmponent.DialogCaller interface
-    void onDialogReturn(Object value)
-    {
-      switch ((String) dialogData[0])
-      {
-      case "SelectedFile":
-      case "runnable":
-        dialogData[0] = value;
-        ((Runnable) dialogData[1]).run();
-        break;
-      default:
-      }
-    }
-
-    // JSCOmponent.DialogCaller interface
-    void onDialogReturn(int value)
-    {
-      if (value != Math.floor(value))
-      {
-        // in JavaScript, this will be NaN, oddly enough
-        return;
-      }
-
-      switch ((String) dialogData[0])
-      {
-      case "runnable":
-        dialogData[0] = Integer.valueOf(value);
-        ((Runnable) dialogData[1]).run();
-        break;
-      case "label.input_alignment_from_url":
-        // reconstruct the parameter data
-        int reply = value;
-        AlignViewport viewport = (AlignViewport) dialogData[1];
-        JComboBox history = (JComboBox) dialogData[2];
-        // the rest of this is unchangaed
-        if (reply != JvOptionPane.OK_OPTION)
-        {
-          return;
-        }
-
-        String url = history.getSelectedItem().toString();
-
-        if (url.toLowerCase().endsWith(".jar"))
-        {
-          if (viewport != null)
-          {
-            new FileLoader().LoadFile(viewport, url, DataSourceType.URL,
-                    FileFormat.Jalview);
-          }
-          else
-          {
-            new FileLoader().LoadFile(url, DataSourceType.URL,
-                    FileFormat.Jalview);
-          }
-        }
-        else
-        {
-          FileFormatI format = null;
-          try
-          {
-            format = new IdentifyFile().identify(url, DataSourceType.URL);
-          } catch (FileFormatException e)
-          {
-            // TODO revise error handling, distinguish between
-            // URL not found and response not valid
-          }
-
-          if (format == null)
-          {
-            JvOptionPane.showInternalMessageDialog(Desktop.desktop,
-                    MessageManager.formatMessage("label.couldnt_locate",
-                            new Object[]
-                            { url }),
-                    MessageManager.getString("label.url_not_found"),
-                    JvOptionPane.WARNING_MESSAGE);
-
-            return;
-          }
-
-          if (viewport != null)
-          {
-            new FileLoader().LoadFile(viewport, url, DataSourceType.URL,
-                    format);
-          }
-          else
-          {
-            new FileLoader().LoadFile(url, DataSourceType.URL, format);
-          }
-        }
-
-        break;
-      }
-
-    }
-
     private static final float ONE_MB = 1048576f;
 
     boolean showMemoryUsage = false;
@@ -2667,11 +2692,11 @@ public class Desktop extends jalview.jbgui.GDesktop
   {
     if (Jalview.isHeadlessMode())
     {
-      // Desktop.desktop is null in headless mode
-      return new AlignFrame[] { Jalview.currentAlignFrame };
+      // Desktop.getDesktop() is null in headless mode
+      return new AlignFrame[] { Jalview.getCurrentAlignFrame() };
     }
 
-    JInternalFrame[] frames = Desktop.desktop.getAllFrames();
+    JInternalFrame[] frames = Desktop.getDesktopPane().getAllFrames();
 
     if (frames == null)
     {
@@ -2716,7 +2741,7 @@ public class Desktop extends jalview.jbgui.GDesktop
    */
   public GStructureViewer[] getJmols()
   {
-    JInternalFrame[] frames = Desktop.desktop.getAllFrames();
+    JInternalFrame[] frames = Desktop.getDesktopPane().getAllFrames();
 
     if (frames == null)
     {
@@ -2752,7 +2777,7 @@ public class Desktop extends jalview.jbgui.GDesktop
     } catch (Exception ex)
     {
       jalview.bin.Cache.log.error("Groovy Shell Creation failed.", ex);
-      JvOptionPane.showInternalMessageDialog(Desktop.desktop,
+      JvOptionPane.showInternalMessageDialog(desktopPane,
 
               MessageManager.getString("label.couldnt_create_groovy_shell"),
               MessageManager.getString("label.groovy_support_failed"),
@@ -2763,7 +2788,7 @@ public class Desktop extends jalview.jbgui.GDesktop
   /**
    * Open the Groovy console
    */
-  void openGroovyConsole()
+  private void openGroovyConsole()
   {
     if (groovyConsole == null)
     {
@@ -2863,6 +2888,8 @@ public class Desktop extends jalview.jbgui.GDesktop
   @Override
   public void setProgressBar(String message, long id)
   {
+           Platform.timeCheck("Desktop " + message, Platform.TIME_MARK);     
+
     if (progressBars == null)
     {
       progressBars = new Hashtable<>();
@@ -2947,7 +2974,7 @@ public class Desktop extends jalview.jbgui.GDesktop
    */
   public static AlignFrame getAlignFrameFor(AlignViewportI viewport)
   {
-    if (desktop != null)
+    if (getDesktopPane() != null)
     {
       AlignmentPanel[] aps = getAlignmentPanels(
               viewport.getSequenceSetId());
@@ -3008,8 +3035,8 @@ public class Desktop extends jalview.jbgui.GDesktop
       // todo: changesupport handlers need to be transferred
       if (discoverer == null)
       {
-        discoverer = new jalview.ws.jws1.Discoverer();
-        // register PCS handler for desktop.
+        discoverer = Discoverer.getInstance();
+        // register PCS handler for getDesktop().
         discoverer.addPropertyChangeListener(changeSupport);
       }
       // JAL-940 - disabled JWS1 service configuration - always start discoverer
@@ -3019,7 +3046,7 @@ public class Desktop extends jalview.jbgui.GDesktop
 
     if (Cache.getDefault("SHOW_JWS2_SERVICES", true))
     {
-      t2 = jalview.ws.jws2.Jws2Discoverer.getDiscoverer()
+      t2 = jalview.ws.jws2.Jws2Discoverer.getInstance()
               .startDiscoverer(changeSupport);
     }
     Thread t3 = null;
@@ -3052,7 +3079,7 @@ public class Desktop extends jalview.jbgui.GDesktop
   {
     if (evt.getNewValue() == null || evt.getNewValue() instanceof Vector)
     {
-      final String ermsg = jalview.ws.jws2.Jws2Discoverer.getDiscoverer()
+      final String ermsg = jalview.ws.jws2.Jws2Discoverer.getInstance()
               .getErrorMessages();
       if (ermsg != null)
       {
@@ -3091,7 +3118,7 @@ public class Desktop extends jalview.jbgui.GDesktop
                  * 
                  * jd.waitForInput();
                  */
-                JvOptionPane.showConfirmDialog(Desktop.desktop,
+                JvOptionPane.showConfirmDialog(Desktop.getDesktopPane(),
                         new JLabel("<html><table width=\"450\"><tr><td>"
                                 + ermsg + "</td></tr></table>"
                                 + "<p>It may be that you have invalid JABA URLs<br/>in your web service preferences,"
@@ -3117,7 +3144,7 @@ public class Desktop extends jalview.jbgui.GDesktop
     }
   }
 
-  private Runnable serviceChangedDialog = null;
+  Runnable serviceChangedDialog = null;
 
   /**
    * start a thread to open a URL in the configured browser. Pops up a warning
@@ -3128,7 +3155,7 @@ public class Desktop extends jalview.jbgui.GDesktop
    */
   public static void showUrl(final String url)
   {
-    showUrl(url, Desktop.instance);
+    showUrl(url, Desktop.getInstance());
   }
 
   /**
@@ -3154,10 +3181,10 @@ public class Desktop extends jalview.jbgui.GDesktop
                     .formatMessage("status.opening_params", new Object[]
                     { url }), this.hashCode());
           }
-          jalview.util.BrowserLauncher.openURL(url);
+          BrowserLauncher.openURL(url);
         } catch (Exception ex)
         {
-          JvOptionPane.showInternalMessageDialog(Desktop.desktop,
+          JvOptionPane.showInternalMessageDialog(Desktop.getDesktopPane(),
                   MessageManager
                           .getString("label.web_browser_not_found_unix"),
                   MessageManager.getString("label.web_browser_not_found"),
@@ -3173,15 +3200,16 @@ public class Desktop extends jalview.jbgui.GDesktop
     }).start();
   }
 
-  public static WsParamSetManager wsparamManager = null;
+  private WsParamSetManager wsparamManager = null;
 
   public static ParamManager getUserParameterStore()
   {
-    if (wsparamManager == null)
+    Desktop d = Desktop.getInstance();
+    if (d.wsparamManager == null)
     {
-      wsparamManager = new WsParamSetManager();
+      d.wsparamManager = new WsParamSetManager();
     }
-    return wsparamManager;
+    return d.wsparamManager;
   }
 
   /**
@@ -3226,14 +3254,16 @@ public class Desktop extends jalview.jbgui.GDesktop
   /**
    * flag indicating if dialogExecutor should try to acquire a permit
    */
-  private volatile boolean dialogPause = true;
+  volatile boolean dialogPause = true;
 
   /**
    * pause the queue
    */
-  private java.util.concurrent.Semaphore block = new Semaphore(0);
+  java.util.concurrent.Semaphore block = new Semaphore(0);
+
+  private groovy.ui.Console groovyConsole;
 
-  private static groovy.ui.Console groovyConsole;
+  public StructureViewer lastTargetedView;
 
   /**
    * add another dialog thread to the queue
@@ -3255,9 +3285,8 @@ public class Desktop extends jalview.jbgui.GDesktop
           } catch (InterruptedException x)
           {
           }
-          ;
         }
-        if (instance == null)
+        if (Jalview.isHeadlessMode())
         {
           return;
         }
@@ -3421,7 +3450,7 @@ public class Desktop extends jalview.jbgui.GDesktop
     String topViewId = myTopFrame.viewport.getSequenceSetId();
     String bottomViewId = myBottomFrame.viewport.getSequenceSetId();
 
-    JInternalFrame[] frames = desktop.getAllFrames();
+    JInternalFrame[] frames = desktopPane.getAllFrames();
     for (JInternalFrame frame : frames)
     {
       if (frame instanceof SplitFrame && frame != source)
@@ -3466,7 +3495,8 @@ public class Desktop extends jalview.jbgui.GDesktop
 
   public static groovy.ui.Console getGroovyConsole()
   {
-    return groovyConsole;
+    Desktop desktop = Desktop.getInstance();
+    return desktop == null ? null : desktop.groovyConsole;
   }
 
   /**
@@ -3484,6 +3514,7 @@ public class Desktop extends jalview.jbgui.GDesktop
    *          - the payload from the drop event
    * @throws Exception
    */
+  @SuppressWarnings("unchecked")
   public static void transferFromDropTarget(List<Object> files,
           List<DataSourceType> protocols, DropTargetDropEvent evt,
           Transferable t) throws Exception
@@ -3538,12 +3569,11 @@ public class Desktop extends jalview.jbgui.GDesktop
         }
         else
         {
-          if (Platform.isAMac())
+          if (Platform.isAMacAndNotJS())
           {
             System.err.println(
                     "Please ignore plist error - occurs due to problem with java 8 on OSX");
           }
-          ;
         }
       } catch (Throwable ex)
       {
@@ -3554,7 +3584,7 @@ public class Desktop extends jalview.jbgui.GDesktop
     {
       // Works on Windows and MacOSX
       Cache.log.debug("Drop handled as javaFileListFlavor");
-      for (Object file : (List) t
+      for (Object file : (List<Object>) t
               .getTransferData(DataFlavor.javaFileListFlavor))
       {
         files.add(file);
@@ -3655,8 +3685,7 @@ public class Desktop extends jalview.jbgui.GDesktop
         }
       }
     }
-    if (Platform.isWindows())
-
+    if (Platform.isWindowsAndNotJS())
     {
       Cache.log.debug("Scanning dropped content for Windows Link Files");
 
@@ -3719,7 +3748,7 @@ public class Desktop extends jalview.jbgui.GDesktop
           Class<? extends StructureViewerBase> structureViewerClass)
   {
     List<StructureViewerBase> result = new ArrayList<>();
-    JInternalFrame[] frames = Desktop.instance.getAllFrames();
+    JInternalFrame[] frames = getAllFrames();
 
     for (JInternalFrame frame : frames)
     {
@@ -3738,4 +3767,5 @@ public class Desktop extends jalview.jbgui.GDesktop
     }
     return result;
   }
+
 }