Merge branch 'alpha/JAL-3362_Jalview_212_alpha' into alpha/merge_212_JalviewJS_2112
[jalview.git] / src / jalview / gui / SplitFrame.java
index 9e2281e..81f0134 100644 (file)
@@ -1,28 +1,64 @@
+/*
+ * Jalview - A Sequence Alignment Editor and Viewer ($$Version-Rel$$)
+ * Copyright (C) $$Year-Rel$$ The Jalview Authors
+ * 
+ * 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/>.
+ * The Jalview Authors are detailed in the 'AUTHORS' file.
+ */
 package jalview.gui;
 
+import jalview.api.AlignViewportI;
+import jalview.api.AlignViewControllerGuiI;
+import jalview.api.FeatureSettingsControllerI;
 import jalview.api.SplitContainerI;
-import jalview.api.ViewStyleI;
+import jalview.controller.FeatureSettingsControllerGuiI;
 import jalview.datamodel.AlignmentI;
 import jalview.jbgui.GAlignFrame;
 import jalview.jbgui.GSplitFrame;
 import jalview.structure.StructureSelectionManager;
+import jalview.util.MessageManager;
+import jalview.util.Platform;
 import jalview.viewmodel.AlignmentViewport;
 
+import java.awt.BorderLayout;
 import java.awt.Component;
-import java.awt.Toolkit;
+import java.awt.Dimension;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 import java.awt.event.KeyAdapter;
 import java.awt.event.KeyEvent;
 import java.awt.event.KeyListener;
 import java.beans.PropertyVetoException;
+import java.util.Arrays;
+import java.util.List;
 import java.util.Map.Entry;
 
 import javax.swing.AbstractAction;
 import javax.swing.InputMap;
+import javax.swing.JButton;
 import javax.swing.JComponent;
+import javax.swing.JDesktopPane;
+import javax.swing.JInternalFrame;
+import javax.swing.JLayeredPane;
 import javax.swing.JMenuItem;
+import javax.swing.JPanel;
+import javax.swing.JTabbedPane;
 import javax.swing.KeyStroke;
+import javax.swing.event.ChangeEvent;
+import javax.swing.event.ChangeListener;
 import javax.swing.event.InternalFrameAdapter;
 import javax.swing.event.InternalFrameEvent;
 
@@ -40,8 +76,25 @@ import javax.swing.event.InternalFrameEvent;
  */
 public class SplitFrame extends GSplitFrame implements SplitContainerI
 {
+  private static final int WINDOWS_INSETS_WIDTH = 28; // tbc
+
+  private static final int MAC_INSETS_WIDTH = 28;
+
+  private static final int WINDOWS_INSETS_HEIGHT = 50; // tbc
+
+  private static final int MAC_INSETS_HEIGHT = 50;
+
+  private static final int DESKTOP_DECORATORS_HEIGHT = 65;
+
   private static final long serialVersionUID = 1L;
 
+  /**
+   * geometry for Feature Settings Holder
+   */
+  private static final int FS_MIN_WIDTH = 400;
+
+  private static final int FS_MIN_HEIGHT = 400;
+
   public SplitFrame(GAlignFrame top, GAlignFrame bottom)
   {
     super(top, bottom);
@@ -61,12 +114,19 @@ public class SplitFrame extends GSplitFrame implements SplitContainerI
     ((AlignFrame) getTopFrame()).getViewport().setCodingComplement(
             ((AlignFrame) getBottomFrame()).getViewport());
 
-    int width = ((AlignFrame) getTopFrame()).getWidth();
-    // about 50 pixels for the SplitFrame's title bar etc
+    /*
+     * estimate width and height of SplitFrame; this.getInsets() doesn't seem to
+     * give the full additional size (a few pixels short)
+     */
+    int widthFudge = Platform.isAMacAndNotJS() ? MAC_INSETS_WIDTH
+            : WINDOWS_INSETS_WIDTH;
+    int heightFudge = Platform.isAMacAndNotJS() ? MAC_INSETS_HEIGHT
+            : WINDOWS_INSETS_HEIGHT;
+    int width = ((AlignFrame) getTopFrame()).getWidth() + widthFudge;
     int height = ((AlignFrame) getTopFrame()).getHeight()
-            + ((AlignFrame) getBottomFrame()).getHeight() + 50;
-    // about 65 pixels for Desktop decorators on Windows
-    height = Math.min(height, Desktop.instance.getHeight() - 65);
+            + ((AlignFrame) getBottomFrame()).getHeight() + DIVIDER_SIZE
+            + heightFudge;
+    height = fitHeightToDesktop(height);
     setSize(width, height);
 
     adjustLayout();
@@ -81,6 +141,28 @@ public class SplitFrame extends GSplitFrame implements SplitContainerI
   }
 
   /**
+   * Reduce the height if too large to fit in the Desktop. Also adjust the
+   * divider location in proportion.
+   * 
+   * @param height
+   *          in pixels
+   * @return original or reduced height
+   */
+  public int fitHeightToDesktop(int height)
+  {
+    // allow about 65 pixels for Desktop decorators on Windows
+
+    int newHeight = Math.min(height,
+            Desktop.instance.getHeight() - DESKTOP_DECORATORS_HEIGHT);
+    if (newHeight != height)
+    {
+      int oldDividerLocation = getDividerLocation();
+      setDividerLocation(oldDividerLocation * newHeight / height);
+    }
+    return newHeight;
+  }
+
+  /**
    * Set the top and bottom frames to listen to each others Commands (e.g. Edit,
    * Order).
    */
@@ -99,26 +181,21 @@ public class SplitFrame extends GSplitFrame implements SplitContainerI
    */
   public void adjustLayout()
   {
+    final AlignViewport topViewport = ((AlignFrame) getTopFrame()).viewport;
+    final AlignViewport bottomViewport = ((AlignFrame) getBottomFrame()).viewport;
+
     /*
      * Ensure sequence ids are the same width so sequences line up
      */
-    int w1 = ((AlignFrame) getTopFrame()).getViewport().getIdWidth();
-    int w2 = ((AlignFrame) getBottomFrame()).getViewport().getIdWidth();
+    int w1 = topViewport.getIdWidth();
+    int w2 = bottomViewport.getIdWidth();
     int w3 = Math.max(w1, w2);
-    if (w1 != w3)
-    {
-      ((AlignFrame) getTopFrame()).getViewport().setIdWidth(w3);
-    }
-    if (w2 != w3)
-    {
-      ((AlignFrame) getBottomFrame()).getViewport().setIdWidth(w3);
-    }
+    topViewport.setIdWidth(w3);
+    bottomViewport.setIdWidth(w3);
 
     /*
      * Scale protein to either 1 or 3 times character width of dna
      */
-    final AlignViewport topViewport = ((AlignFrame) getTopFrame()).viewport;
-    final AlignViewport bottomViewport = ((AlignFrame) getBottomFrame()).viewport;
     final AlignmentI topAlignment = topViewport.getAlignment();
     final AlignmentI bottomAlignment = bottomViewport.getAlignment();
     AlignmentViewport cdna = topAlignment.isNucleotide() ? topViewport
@@ -127,14 +204,90 @@ public class SplitFrame extends GSplitFrame implements SplitContainerI
             : (!bottomAlignment.isNucleotide() ? bottomViewport : null);
     if (protein != null && cdna != null)
     {
-      ViewStyleI vs = protein.getViewStyle();
-      int scale = vs.isScaleProteinAsCdna() ? 3 : 1;
-      vs.setCharWidth(scale * cdna.getViewStyle().getCharWidth());
-      protein.setViewStyle(vs);
+      int scale = protein.isScaleProteinAsCdna() ? 3 : 1;
+      protein.setCharWidth(scale * cdna.getViewStyle().getCharWidth());
     }
   }
 
   /**
+   * Adjusts the divider for a sensible split of the real estate (for example,
+   * when many transcripts are shown with a single protein). This should only be
+   * called after the split pane has been laid out (made visible) so it has a
+   * height. The aim is to avoid unnecessary vertical scroll bars, while
+   * ensuring that at least 2 sequences are visible in each panel.
+   * <p>
+   * Once laid out, the user may choose to customise as they wish, so this
+   * method is not called again after the initial layout.
+   */
+  protected void adjustInitialLayout()
+  {
+    AlignFrame topFrame = (AlignFrame) getTopFrame();
+    AlignFrame bottomFrame = (AlignFrame) getBottomFrame();
+
+    /*
+     * recompute layout of top and bottom panels to reflect their
+     * actual (rather than requested) height
+     */
+    topFrame.alignPanel.adjustAnnotationHeight();
+    bottomFrame.alignPanel.adjustAnnotationHeight();
+
+    final AlignViewportI topViewport = topFrame.viewport;
+    final AlignViewportI bottomViewport = bottomFrame.viewport;
+    final AlignmentI topAlignment = topViewport.getAlignment();
+    final AlignmentI bottomAlignment = bottomViewport.getAlignment();
+    boolean topAnnotations = topViewport.isShowAnnotation();
+    boolean bottomAnnotations = bottomViewport.isShowAnnotation();
+    // TODO need number of visible sequences here, not #sequences - how?
+    int topCount = topAlignment.getHeight();
+    int bottomCount = bottomAlignment.getHeight();
+    int topCharHeight = topViewport.getViewStyle().getCharHeight();
+    int bottomCharHeight = bottomViewport.getViewStyle().getCharHeight();
+
+    /*
+     * calculate the minimum ratio that leaves at least the height 
+     * of two sequences (after rounding) visible in the top panel
+     */
+    int topPanelHeight = topFrame.getHeight();
+    int bottomPanelHeight = bottomFrame.getHeight();
+    int topSequencesHeight = topFrame.alignPanel.getSeqPanel().seqCanvas
+            .getHeight();
+    int topPanelMinHeight = topPanelHeight
+            - Math.max(0, topSequencesHeight - 3 * topCharHeight);
+    double totalHeight = (double) topPanelHeight + bottomPanelHeight;
+    double minRatio = topPanelMinHeight / totalHeight;
+
+    /*
+     * calculate the maximum ratio that leaves at least the height 
+     * of two sequences (after rounding) visible in the bottom panel
+     */
+    int bottomSequencesHeight = bottomFrame.alignPanel.getSeqPanel().seqCanvas
+            .getHeight();
+    int bottomPanelMinHeight = bottomPanelHeight
+            - Math.max(0, bottomSequencesHeight - 3 * bottomCharHeight);
+    double maxRatio = (totalHeight - bottomPanelMinHeight) / totalHeight;
+
+    /*
+     * estimate ratio of (topFrameContent / bottomFrameContent)
+     */
+    int insets = Platform.isAMacAndNotJS() ? MAC_INSETS_HEIGHT
+            : WINDOWS_INSETS_HEIGHT;
+    // allow 3 'rows' for scale, scrollbar, status bar
+    int topHeight = insets + (3 + topCount) * topCharHeight
+            + (topAnnotations ? topViewport.calcPanelHeight() : 0);
+    int bottomHeight = insets + (3 + bottomCount) * bottomCharHeight
+            + (bottomAnnotations ? bottomViewport.calcPanelHeight() : 0);
+    double ratio = ((double) topHeight)
+            / (double) (topHeight + bottomHeight);
+
+    /*
+     * limit ratio to avoid concealing all sequences
+     */
+    ratio = Math.min(ratio, maxRatio);
+    ratio = Math.max(ratio, minRatio);
+    setRelativeDividerLocation(ratio);
+  }
+
+  /**
    * Add a listener to tidy up when the frame is closed.
    */
   protected void addCloseFrameListener()
@@ -236,6 +389,7 @@ public class SplitFrame extends GSplitFrame implements SplitContainerI
         actioned = true;
         e.consume();
       }
+      break;
     default:
     }
     return actioned;
@@ -273,8 +427,8 @@ public class SplitFrame extends GSplitFrame implements SplitContainerI
     /*
      * Ctrl-W / Cmd-W - close view or window
      */
-    KeyStroke key_cmdW = KeyStroke.getKeyStroke(KeyEvent.VK_W, Toolkit
-            .getDefaultToolkit().getMenuShortcutKeyMask(), false);
+    KeyStroke key_cmdW = KeyStroke.getKeyStroke(KeyEvent.VK_W,
+            jalview.util.ShortcutKeyMaskExWrapper.getMenuShortcutKeyMaskEx(), false);
     action = new AbstractAction()
     {
       @Override
@@ -294,8 +448,8 @@ public class SplitFrame extends GSplitFrame implements SplitContainerI
     /*
      * Ctrl-T / Cmd-T open new view
      */
-    KeyStroke key_cmdT = KeyStroke.getKeyStroke(KeyEvent.VK_T, Toolkit
-            .getDefaultToolkit().getMenuShortcutKeyMask(), false);
+    KeyStroke key_cmdT = KeyStroke.getKeyStroke(KeyEvent.VK_T,
+            jalview.util.ShortcutKeyMaskExWrapper.getMenuShortcutKeyMaskEx(), false);
     AbstractAction action = new AbstractAction()
     {
       @Override
@@ -348,8 +502,8 @@ public class SplitFrame extends GSplitFrame implements SplitContainerI
         Component c = getFrameAtMouse();
         if (c != null && c instanceof AlignFrame)
         {
-          for (ActionListener a : ((AlignFrame) c).getAccelerators()
-                  .get(ks).getActionListeners())
+          for (ActionListener a : ((AlignFrame) c).getAccelerators().get(ks)
+                  .getActionListeners())
           {
             a.actionPerformed(null);
           }
@@ -401,7 +555,7 @@ public class SplitFrame extends GSplitFrame implements SplitContainerI
       topFrame.setDisplayedView(newTopPanel);
     }
 
-    newBottomPanel.av.viewName = newTopPanel.av.viewName;
+    newBottomPanel.av.setViewName(newTopPanel.av.getViewName());
     newTopPanel.av.setCodingComplement(newBottomPanel.av);
 
     /*
@@ -612,6 +766,35 @@ public class SplitFrame extends GSplitFrame implements SplitContainerI
   }
 
   /**
+   * return the AlignFrames held by this container
+   * 
+   * @return { Top alignFrame (Usually CDS), Bottom AlignFrame (Usually
+   *         Protein)}
+   */
+  public List<AlignFrame> getAlignFrames()
+  {
+    return Arrays
+            .asList(new AlignFrame[]
+            { (AlignFrame) getTopFrame(), (AlignFrame) getBottomFrame() });
+  }
+
+  @Override
+  public AlignFrame getComplementAlignFrame(
+          AlignViewControllerGuiI alignFrame)
+  {
+    if (getTopFrame() == alignFrame)
+    {
+      return (AlignFrame) getBottomFrame();
+    }
+    if (getBottomFrame() == alignFrame)
+    {
+      return (AlignFrame) getTopFrame();
+    }
+    // we didn't know anything about this frame...
+    return null;
+  }
+
+  /**
    * Replace Cmd-F Find action with our version. This is necessary because the
    * 'default' Finder searches in the first AlignFrame it finds. We need it to
    * search in the half of the SplitFrame that has the mouse.
@@ -621,8 +804,8 @@ public class SplitFrame extends GSplitFrame implements SplitContainerI
     /*
      * Ctrl-F / Cmd-F open Finder dialog, 'focused' on the right alignment
      */
-    KeyStroke key_cmdF = KeyStroke.getKeyStroke(KeyEvent.VK_F, Toolkit
-            .getDefaultToolkit().getMenuShortcutKeyMask(), false);
+    KeyStroke key_cmdF = KeyStroke.getKeyStroke(KeyEvent.VK_F,
+            jalview.util.ShortcutKeyMaskExWrapper.getMenuShortcutKeyMaskEx(), false);
     AbstractAction action = new AbstractAction()
     {
       @Override
@@ -638,4 +821,284 @@ public class SplitFrame extends GSplitFrame implements SplitContainerI
     };
     overrideKeyBinding(key_cmdF, action);
   }
+
+  /**
+   * Override to do nothing if triggered from one of the child frames
+   */
+  @Override
+  public void setSelected(boolean selected) throws PropertyVetoException
+  {
+    JDesktopPane desktopPane = getDesktopPane();
+    JInternalFrame fr = desktopPane == null ? null
+            : desktopPane.getSelectedFrame();
+    if (fr == getTopFrame() || fr == getBottomFrame())
+    {
+      /* 
+       * patch for JAL-3288 (deselecting top/bottom frame closes popup menu); 
+       * it may be possible to remove this method in future
+       * if the underlying Java behaviour changes
+       */
+      if (selected)
+      {
+        moveToFront();
+      }
+      return;
+    }
+    super.setSelected(selected);
+  }
+
+  /**
+   * holds the frame for feature settings, so Protein and DNA tabs can be managed
+   */
+  JInternalFrame featureSettingsUI;
+
+  JTabbedPane featureSettingsPanels;
+
+  @Override
+  public void addFeatureSettingsUI(
+          FeatureSettingsControllerGuiI featureSettings)
+  {
+    boolean showInternalFrame = false;
+    if (featureSettingsUI == null || featureSettingsPanels == null)
+    {
+      showInternalFrame = true;
+      featureSettingsPanels = new JTabbedPane();
+      featureSettingsPanels.addChangeListener(new ChangeListener()
+      {
+
+        @Override
+        public void stateChanged(ChangeEvent e)
+        {
+          if (e.getSource() != featureSettingsPanels
+                  || featureSettingsUI == null
+                  || featureSettingsUI.isClosed()
+                  || !featureSettingsUI.isVisible())
+          {
+            // not our tabbed pane
+            return;
+          }
+          int tab = featureSettingsPanels.getSelectedIndex();
+          if (tab < 0 || featureSettingsPanels
+                  .getSelectedComponent() instanceof FeatureSettingsControllerGuiI)
+          {
+            // no tab selected or already showing a feature settings GUI
+            return;
+          }
+          getAlignFrames().get(tab).showFeatureSettingsUI();
+        }
+      });
+      featureSettingsUI = new JInternalFrame(MessageManager.getString(
+              "label.sequence_feature_settings_for_CDS_and_Protein"));
+      featureSettingsPanels.setOpaque(true);
+
+      JPanel dialog = new JPanel();
+      dialog.setOpaque(true);
+      dialog.setLayout(new BorderLayout());
+      dialog.add(featureSettingsPanels, BorderLayout.CENTER);
+      JPanel buttons = new JPanel();
+      JButton ok = new JButton(MessageManager.getString("action.ok"));
+      ok.addActionListener(new ActionListener()
+      {
+
+        @Override
+        public void actionPerformed(ActionEvent e)
+        {
+          try
+          {
+            featureSettingsUI.setClosed(true);
+          } catch (PropertyVetoException pv)
+          {
+            pv.printStackTrace();
+          }
+        }
+      });
+      JButton cancel = new JButton(
+              MessageManager.getString("action.cancel"));
+      cancel.addActionListener(new ActionListener()
+      {
+
+        @Override
+        public void actionPerformed(ActionEvent e)
+        {
+          try
+          {
+            for (Component fspanel : featureSettingsPanels.getComponents())
+            {
+              if (fspanel instanceof FeatureSettingsControllerGuiI)
+              {
+                ((FeatureSettingsControllerGuiI) fspanel).revert();
+              }
+            }
+            featureSettingsUI.setClosed(true);
+          } catch (Exception pv)
+          {
+            pv.printStackTrace();
+          }
+        }
+      });
+      buttons.add(ok);
+      buttons.add(cancel);
+      dialog.add(buttons, BorderLayout.SOUTH);
+      featureSettingsUI.setContentPane(dialog);
+      createDummyTabs();
+    }
+    if (featureSettingsPanels
+            .indexOfTabComponent((Component) featureSettings) > -1)
+    {
+      // just show the feature settings !
+      featureSettingsPanels
+              .setSelectedComponent((Component) featureSettings);
+      return;
+    }
+    // otherwise replace the dummy tab with the given feature settings
+    int pos = getAlignFrames().indexOf(featureSettings.getAlignframe());
+    // if pos==-1 then alignFrame isn't managed by this splitframe
+    if (pos == 0)
+    {
+      featureSettingsPanels.removeTabAt(0);
+      featureSettingsPanels.insertTab(tabName[0], null,
+              (Component) featureSettings,
+              MessageManager.formatMessage(
+                      "label.sequence_feature_settings_for", tabName[0]),
+              0);
+    }
+    if (pos == 1)
+    {
+      featureSettingsPanels.removeTabAt(1);
+      featureSettingsPanels.insertTab(tabName[1], null,
+              (Component) featureSettings,
+              MessageManager.formatMessage(
+                      "label.sequence_feature_settings_for", tabName[1]),
+              1);
+    }
+    featureSettingsPanels.setSelectedComponent((Component) featureSettings);
+
+    // TODO: JAL-3535 - construct a feature settings title including names of
+    // currently selected CDS and Protein names
+
+    if (showInternalFrame)
+    {
+      if (Platform.isAMacAndNotJS())
+      {
+        Desktop.addInternalFrame(featureSettingsUI,
+                MessageManager.getString(
+                        "label.sequence_feature_settings_for_CDS_and_Protein"),
+                600, 480);
+      }
+      else
+      {
+        Desktop.addInternalFrame(featureSettingsUI,
+                MessageManager.getString(
+                        "label.sequence_feature_settings_for_CDS_and_Protein"),
+                600, 450);
+      }
+      featureSettingsUI
+              .setMinimumSize(new Dimension(FS_MIN_WIDTH, FS_MIN_HEIGHT));
+
+      featureSettingsUI.addInternalFrameListener(
+              new javax.swing.event.InternalFrameAdapter()
+              {
+                @Override
+                public void internalFrameClosed(
+                        javax.swing.event.InternalFrameEvent evt)
+                {
+                  for (int tab = 0; tab < featureSettingsPanels
+                          .getTabCount();)
+                  {
+                    FeatureSettingsControllerGuiI fsettings = (FeatureSettingsControllerGuiI) featureSettingsPanels
+                            .getTabComponentAt(tab);
+                    if (fsettings != null)
+                    {
+                      featureSettingsPanels.removeTabAt(tab);
+                      fsettings.featureSettings_isClosed();
+                    }
+                    else
+                    {
+                      tab++;
+                    }
+                  }
+                  featureSettingsPanels = null;
+                  featureSettingsUI = null;
+                };
+              });
+      featureSettingsUI.setLayer(JLayeredPane.PALETTE_LAYER);
+    }
+  }
+
+  /**
+   * tab names for feature settings
+   */
+  private String[] tabName = new String[] {
+      MessageManager.getString("label.CDS"),
+      MessageManager.getString("label.protein") };
+
+  /**
+   * create placeholder tabs which materialise the feature settings for a given
+   * view. Also reinitialises any tabs containing stale feature settings
+   */
+  private void createDummyTabs()
+  {
+    for (int tabIndex = 0; tabIndex < 2; tabIndex++)
+    {
+      JPanel dummyTab = new JPanel();
+      featureSettingsPanels.addTab(tabName[tabIndex], dummyTab);
+    }
+  }
+
+  private void replaceWithDummyTab(FeatureSettingsControllerI toClose)
+  {
+    Component dummyTab = null;
+    for (int tabIndex = 0; tabIndex < 2; tabIndex++)
+    {
+      if (featureSettingsPanels.getTabCount() > tabIndex)
+      {
+        dummyTab = featureSettingsPanels.getTabComponentAt(tabIndex);
+        if (dummyTab instanceof FeatureSettingsControllerGuiI
+                && !dummyTab.isVisible())
+        {
+          featureSettingsPanels.removeTabAt(tabIndex);
+          // close the feature Settings tab
+          ((FeatureSettingsControllerGuiI) dummyTab)
+                  .featureSettings_isClosed();
+          // create a dummy tab in its place
+          dummyTab = new JPanel();
+          featureSettingsPanels.insertTab(tabName[tabIndex], null, dummyTab,
+                  MessageManager.formatMessage(
+                          "label.sequence_feature_settings_for",
+                          tabName[tabIndex]),
+                  tabIndex);
+        }
+      }
+    }
+  }
+
+  @Override
+  public void closeFeatureSettings(
+          FeatureSettingsControllerI featureSettings,
+          boolean closeContainingFrame)
+  {
+    if (featureSettingsUI != null)
+    {
+      if (closeContainingFrame)
+      {
+        try
+        {
+          featureSettingsUI.setClosed(true);
+        } catch (Exception x)
+        {
+        }
+        featureSettingsUI = null;
+      }
+      else
+      {
+        replaceWithDummyTab(featureSettings);
+      }
+    }
+  }
+
+  @Override
+  public boolean isFeatureSettingsOpen()
+  {
+    return featureSettingsUI != null && !featureSettingsUI.isClosed();
+  }
 }