CSSTUDIO-1761 (Part 1/2) Add functionality to the menu of the main window for adding a layout to the current layout.

core/ui/src/main/java/org/phoebus/ui/application/Messages.java

@@ -12,6 +12,7 @@
 public class Messages
 {
     // Keep in alphabetical order and aligned with messages.properties
+    public static String AddLayout;
     public static String AllFiles;
     public static String AlwaysShowTabs;
     public static String Applications;

core/ui/src/main/java/org/phoebus/ui/application/PhoebusApplication.java

@@ -2,17 +2,10 @@
 
 import java.io.File;
 import java.io.FileInputStream;
+import java.io.FileNotFoundException;
 import java.lang.ref.WeakReference;
 import java.net.URI;
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.Collection;
-import java.util.Comparator;
-import java.util.HashMap;
-import java.util.Iterator;
-import java.util.List;
-import java.util.Map;
-import java.util.Optional;
+import java.util.*;
 import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicBoolean;
@@ -176,6 +169,11 @@ public class PhoebusApplication extends Application {
      */
     private final Menu load_layout = new Menu(Messages.LoadLayout, ImageCache.getImageView(ImageCache.class, "/icons/layouts.png"));
 
+    /**
+     * Menu to add a layout to the current layout
+     */
+    private final Menu add_layout = new Menu(Messages.AddLayout, ImageCache.getImageView(ImageCache.class, "/icons/layouts.png"));
+
     /**
      * List of memento names
      *
@@ -540,6 +538,7 @@ private MenuBar createMenu(final Stage stage) {
                 new SeparatorMenuItem(),
                 save_layout,
                 load_layout,
+                add_layout,
                 delete_layouts,
                 new SeparatorMenuItem(),
                 /* Full Screen placeholder */
@@ -592,6 +591,7 @@ void createLoadLayoutsMenu() {
 
             final List<MenuItem> menuItemList = new ArrayList<>();
             final List<MenuItem> toolbarMenuItemList = new ArrayList<>();
+            final List<MenuItem> addLayoutMenuItemList = new ArrayList<>();
 
             final Map<String, File> layoutFiles = new HashMap<String, File>();
 
@@ -646,6 +646,12 @@ void createLoadLayoutsMenu() {
                                 toolbarMenuItem.setMnemonicParsing(false);
                                 toolbarMenuItem.setOnAction(event -> startLayoutReplacement(file));
                                 toolbarMenuItemList.add(toolbarMenuItem);
+
+                                // Create menu for adding a layout:
+                                final MenuItem addLayoutMenuItem = new MenuItem(filename);
+                                addLayoutMenuItem.setMnemonicParsing(false);
+                                addLayoutMenuItem.setOnAction(event -> startAddingLayout(file));
+                                addLayoutMenuItemList.add(addLayoutMenuItem);
                             }
                         });
             }
@@ -654,6 +660,7 @@ void createLoadLayoutsMenu() {
             Platform.runLater(() ->
             {
                 load_layout.getItems().setAll(menuItemList);
+                add_layout.getItems().setAll(addLayoutMenuItemList);
                 layout_menu_button.getItems().setAll(toolbarMenuItemList);
                 delete_layouts.setDisable(memento_files.isEmpty());
             });
@@ -1011,6 +1018,28 @@ private void startLayoutReplacement(final File memento_file) {
         });
     }
 
+    /**
+     * Initiate adding a layout to the current layout
+     *
+     * @param mementoFile Memento for the desired layout
+     */
+    private void startAddingLayout(File mementoFile) {
+        JobManager.schedule(mementoFile.getName(), monitor ->
+        {
+            MementoTree mementoTree;
+            try {
+                mementoTree = loadMemento(mementoFile);
+            } catch (FileNotFoundException fileNotFoundException) {
+                logger.log(Level.SEVERE, "Unable to add a layout to the existing layout due to an error when opening the file '" + mementoFile.getAbsolutePath() + "'.");
+                return;
+            } catch (Exception exception) {
+                logger.log(Level.SEVERE, "Unable to add a layout to the existing layout due to an error when parsing the file '" + mementoFile.getAbsolutePath() + "'.");
+                return;
+            }
+            Platform.runLater(() -> addLayoutToCurrentLayout(mementoTree));
+        });
+    }
+
     /**
      * @param memento Memento for new layout that should replace current one
      */
@@ -1096,6 +1125,41 @@ private MementoTree loadMemento(final File memfile) throws Exception {
         return XMLMementoTree.read(new FileInputStream(memfile));
     }
 
+    /**
+     * Adds a layout from a MementoTree to the current layout.
+     */
+    private void addLayoutToCurrentLayout(MementoTree mementoTree) {
+
+        List<Runnable> restoreSelectedTabFunctions = new LinkedList<>();
+        for (Stage stage : DockStage.getDockStages()) {
+            for (DockPane pane : DockStage.getDockPanes(stage)) {
+                DockItem tab = (DockItem) pane.getSelectionModel().getSelectedItem();
+                restoreSelectedTabFunctions.add(() -> tab.select());
+            }
+        }
+
+        List<Runnable> focusNewlyCreatedStageFunctions = new LinkedList<>();
+        for (MementoTree childMementoTree : mementoTree.getChildren()) {
+            Stage stage = new Stage();
+            DockStage.configureStage(stage);
+            MementoHelper.restoreStage(childMementoTree, stage);
+
+            DockStage.deferUntilAllPanesOfStageHaveScenes(stage, () ->
+            {
+                long numberOfRestoredTabsInStage = DockStage.getDockPanes(stage).stream()
+                                                            .flatMap(pane -> pane.getTabs().stream())
+                                                            .count();
+                if (numberOfRestoredTabsInStage > 0) {
+                    focusNewlyCreatedStageFunctions.add(() -> stage.requestFocus());
+                } else {
+                    stage.close();
+                }
+                restoreSelectedTabFunctions.forEach(f -> f.run());
+                focusNewlyCreatedStageFunctions.forEach(f -> f.run());
+            });
+        }
+    }
+
     /**
      * Restore stages from memento
      *

core/ui/src/main/java/org/phoebus/ui/docking/DockPane.java

@@ -9,15 +9,15 @@
 
 import java.lang.ref.WeakReference;
 import java.text.MessageFormat;
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Objects;
+import java.util.*;
 import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.function.Consumer;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 import java.util.stream.Collectors;
 
+import javafx.beans.value.ChangeListener;
+import javafx.beans.value.ObservableValue;
 import org.phoebus.framework.jobs.JobManager;
 import org.phoebus.ui.application.Messages;
 import org.phoebus.ui.dialog.DialogHelper;
@@ -394,38 +394,45 @@ private StackPane findTabHeader()
         return null;
     }
 
-    /** Somewhat hacky:
-     *  Need the scene of this dock pane to adjust the style sheet
+    private Deque<Consumer<Scene>> functionsDeferredUntilInScene = new LinkedList<>();
+    private boolean changeListenerAdded = false;
+    /** Need the scene of this dock pane to adjust the style sheet
      *  or to interact with the Window.
      *
      *  We _have_ added this DockPane to a scene graph, so getScene() should
      *  return the scene.
      *  But if this dock pane is nested inside a newly created {@link SplitDock},
      *  it will not have a scene until it is rendered.
-     *  So keep deferring to the next UI pulse until there is a scene.
-     *  @param user_of_scene Something that needs to run once there is a scene
+     *  The relative ordering in time of deferred function calls is preserved: if
+     *  f1() is deferred before f2() is deferred, then f1() will be called before
+     *  f2() is called.
+     *  @param function Something that needs to run once there is a scene
      */
-    public void deferUntilInScene(final Consumer<Scene> user_of_scene)
-    {
-        // Tried to optimize this based on
-        //     sceneProperty().addListener(...),
-        // creating list of registered users_of_scene,
-        // invoking once the scene property changes to != null,
-        // then deleting the list and removing the listener,
-        // but that added quite some code and failed for
-        // strange endless-loop type reasons.
-        deferUntilInScene(0, user_of_scene);
-    }
-
-    // See deferUntilInScene, giving up after 10 attempts
-    private void deferUntilInScene(final int level, final Consumer<Scene> user_of_scene)
-    {
-        if (getScene() != null)
-            user_of_scene.accept(getScene());
-        else if (level < 10)
-            Platform.runLater(() -> deferUntilInScene(level+1, user_of_scene));
-        else
-            logger.log(Level.WARNING, this + " has no scene for deferred call to " + user_of_scene);
+    public void deferUntilInScene(Consumer<Scene> function) {
+        Scene scene = sceneProperty().get();
+        if (scene != null) {
+            function.accept(scene);
+        }
+        else {
+            functionsDeferredUntilInScene.addLast(function);
+
+            if (!changeListenerAdded) {
+                ChangeListener changeListener = new ChangeListener() {
+                    @Override
+                    public void changed(ObservableValue observableValue, Object oldValue, Object newValue) {
+                        if (newValue != null) {
+                            while(!functionsDeferredUntilInScene.isEmpty()) {
+                                Consumer<Scene> f = functionsDeferredUntilInScene.removeFirst();
+                                f.accept((Scene) newValue);
+                            }
+                            sceneProperty().removeListener(this);
+                        }
+                    }
+                };
+                sceneProperty().addListener(changeListener);
+                changeListenerAdded = true;
+            }
+        }
     }
 
     /** Hide or show tabs
@@ -579,7 +586,7 @@ private void handleDrop(final DragEvent event)
     public SplitDock split(final boolean horizontally)
     {
         final SplitDock split;
-            if (dock_parent instanceof BorderPane)
+        if (dock_parent instanceof BorderPane)
         {
             final BorderPane parent = (BorderPane) dock_parent;
             // Remove this dock pane from BorderPane

core/ui/src/main/java/org/phoebus/ui/docking/DockStage.java

@@ -417,4 +417,18 @@ else if (node instanceof SplitDock)
         else
             buf.append(node).append("\n");
     }
+
+    private static void deferUntilAllPanesOfStageHaveScenes(Runnable runnable, List<DockPane> remainingPanes) {
+        // This is a helper function for implementing deferUntilAllPanesOfStageHaveScenes(Stage stage, Runnable runnable).
+        if (remainingPanes.size() == 0) {
+            runnable.run();
+        } else {
+            var pane = remainingPanes.get(0);
+            pane.deferUntilInScene(scene -> deferUntilAllPanesOfStageHaveScenes(runnable, remainingPanes.subList(1, remainingPanes.size())));
+        }
+    }
+
+    public static void deferUntilAllPanesOfStageHaveScenes(Stage stage, Runnable runnable) {
+        deferUntilAllPanesOfStageHaveScenes(runnable, getDockPanes(stage));
+    }
 }

core/ui/src/main/resources/org/phoebus/ui/application/messages.properties

@@ -1,3 +1,4 @@
+AddLayout=Add Layout
 AllFiles=All Files
 AlwaysShowTabs=Always Show Tabs
 Applications=Applications