bundles/org.simantics.modeling.ui/src/org/simantics/modeling/ui/sg/DiagramSceneGraphProvider.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management
   3  * in Industry THTH ry.
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *     VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.modeling.ui.sg;
  13
  14 import java.awt.Color;
  15 import java.awt.event.AWTEventListener;
  16
  17 import org.eclipse.core.runtime.NullProgressMonitor;
  18 import org.simantics.Simantics;
  19 import org.simantics.databoard.Bindings;
  20 import org.simantics.db.ReadGraph;
  21 import org.simantics.db.Resource;
  22 import org.simantics.db.VirtualGraph;
  23 import org.simantics.db.common.ResourceArray;
  24 import org.simantics.db.common.primitiverequest.PossibleAdapter;
  25 import org.simantics.db.exception.DatabaseException;
  26 import org.simantics.db.exception.ManyObjectsForFunctionalRelationException;
  27 import org.simantics.db.exception.NoSingleResultException;
  28 import org.simantics.db.exception.ServiceException;
  29 import org.simantics.db.management.ISessionContext;
  30 import org.simantics.db.procedure.Listener;
  31 import org.simantics.db.request.Read;
  32 import org.simantics.db.service.VirtualGraphSupport;
  33 import org.simantics.diagram.adapter.DefaultConnectionClassFactory;
  34 import org.simantics.diagram.adapter.FlagClassFactory;
  35 import org.simantics.diagram.adapter.GraphToDiagramSynchronizer;
  36 import org.simantics.diagram.handler.CopyPasteHandler;
  37 import org.simantics.diagram.handler.CopyPasteStrategy;
  38 import org.simantics.diagram.handler.DefaultCopyPasteStrategy;
  39 import org.simantics.diagram.handler.DeleteHandler;
  40 import org.simantics.diagram.handler.SimpleElementTransformHandler;
  41 import org.simantics.diagram.participant.ConnectionCrossingsParticipant;
  42 import org.simantics.diagram.query.DiagramRequests;
  43 import org.simantics.diagram.runtime.RuntimeDiagramManager;
  44 import org.simantics.diagram.stubs.DiagramResource;
  45 import org.simantics.diagram.synchronization.CopyAdvisor;
  46 import org.simantics.diagram.synchronization.SynchronizationHints;
  47 import org.simantics.diagram.ui.DiagramModelHints;
  48 import org.simantics.g2d.canvas.Hints;
  49 import org.simantics.g2d.canvas.ICanvasContext;
  50 import org.simantics.g2d.canvas.impl.CanvasContext;
  51 import org.simantics.g2d.diagram.DiagramHints;
  52 import org.simantics.g2d.diagram.IDiagram;
  53 import org.simantics.g2d.diagram.participant.DiagramParticipant;
  54 import org.simantics.g2d.diagram.participant.ElementInteractor;
  55 import org.simantics.g2d.diagram.participant.ElementPainter;
  56 import org.simantics.g2d.diagram.participant.Selection;
  57 import org.simantics.g2d.diagram.participant.ZOrderHandler;
  58 import org.simantics.g2d.diagram.participant.pointertool.PointerInteractor;
  59 import org.simantics.g2d.element.ElementClassProviders;
  60 import org.simantics.g2d.element.ElementClasses;
  61 import org.simantics.g2d.element.IElementClassProvider;
  62 import org.simantics.g2d.element.handler.impl.StaticObjectAdapter;
  63 import org.simantics.g2d.multileveldiagram.TransitionFunction;
  64 import org.simantics.g2d.multileveldiagram.ZoomTransitionParticipant;
  65 import org.simantics.g2d.page.DiagramDesc;
  66 import org.simantics.g2d.participant.BackgroundPainter;
  67 import org.simantics.g2d.participant.CanvasBoundsParticipant;
  68 import org.simantics.g2d.participant.CanvasGrab;
  69 import org.simantics.g2d.participant.GridPainter;
  70 import org.simantics.g2d.participant.KeyToCommand;
  71 import org.simantics.g2d.participant.KeyUtil;
  72 import org.simantics.g2d.participant.MouseUtil;
  73 import org.simantics.g2d.participant.MultitouchPanZoomRotateInteractor;
  74 import org.simantics.g2d.participant.Notifications;
  75 import org.simantics.g2d.participant.PageBorderParticipant;
  76 import org.simantics.g2d.participant.PanZoomRotateHandler;
  77 import org.simantics.g2d.participant.PointerPainter;
  78 import org.simantics.g2d.participant.RulerPainter;
  79 import org.simantics.g2d.participant.SymbolUtil;
  80 import org.simantics.g2d.participant.TimeParticipant;
  81 import org.simantics.g2d.participant.TransformUtil;
  82 import org.simantics.g2d.participant.ZoomToAreaHandler;
  83 import org.simantics.g2d.scenegraph.ICanvasSceneGraphProvider;
  84 import org.simantics.modeling.ModelingResources;
  85 import org.simantics.modeling.mapping.ComponentCopyAdvisor;
  86 import org.simantics.modeling.mapping.ElementCopyAdvisor;
  87 import org.simantics.modeling.mapping.MappedElementCopyAdvisor;
  88 import org.simantics.modeling.mapping.ModelingSynchronizationHints;
  89 import org.simantics.modeling.ui.diagramEditor.PopulateElementDropParticipant;
  90 import org.simantics.modeling.ui.diagramEditor.PopulateElementMonitorDropParticipant;
  91 import org.simantics.modeling.ui.diagramEditor.handlers.HeadlessStructuralBrowsingHandler;
  92 import org.simantics.modeling.ui.diagramEditor.handlers.HeadlessStructuralBrowsingHandler.IDiagramUpdateSupport;
  93 import org.simantics.scenegraph.g2d.G2DSceneGraph;
  94 import org.simantics.scenegraph.g2d.events.adapter.AWTRemoteEventAdapter;
  95 import org.simantics.scenegraph.g2d.events.command.CommandKeyBinding;
  96 import org.simantics.structural.stubs.StructuralResource2;
  97 import org.simantics.structural2.modelingRules.IModelingRules;
  98 import org.simantics.utils.datastructures.hints.HintContext;
  99 import org.simantics.utils.datastructures.hints.IHintContext;
 100 import org.simantics.utils.page.PageDesc;
 101 import org.simantics.utils.page.PageOrientation;
 102 import org.simantics.utils.threads.AWTThread;
 103 import org.simantics.utils.threads.IThreadWorkQueue;
 104 import org.simantics.utils.threads.ThreadUtils;
 105 import org.simantics.utils.ui.ErrorLogger;
 106
 107
 108 /**
 109  * ISceneGraphProvider implementation for diagrams.
 110  * TODO: decide if this should be stateless or stateful class
 111  *
 112  * @author J-P Laine
 113  *
 114  */
 115 public class DiagramSceneGraphProvider implements ICanvasSceneGraphProvider, IDiagramUpdateSupport {
 116
 117         protected boolean isSymbol = false;
 118     protected Resource resource;
 119     protected ResourceArray structuralPath = null;
 120     protected IDiagram diagram = null;
 121     protected CanvasContext ctx = null;
 122     protected boolean ownsContext = false;
 123     protected GraphToDiagramSynchronizer synchronizer = null;
 124     protected String view = null;
 125     protected Boolean navigation = null;
 126
 127     protected AWTRemoteEventAdapter listener = null;
 128
 129     final IHintContext initialHints = new HintContext();
 130
 131     public DiagramSceneGraphProvider(ReadGraph g, final Resource diagramOrComposite) {
 132         this.structuralPath = new ResourceArray();
 133         try {
 134
 135             StructuralResource2 sr = StructuralResource2.getInstance(g);
 136                 DiagramResource DIA = DiagramResource.getInstance(g);
 137
 138                 Resource diagram = diagramOrComposite;
 139                 if(!g.isInstanceOf(diagram, DIA.Composite)) {
 140
 141                 ModelingResources mr = ModelingResources.getInstance(g);
 142                         diagram = g.getPossibleObject(diagramOrComposite, mr.CompositeToDiagram);
 143                         if(diagram == null) {
 144                     // looks like we have a component without direct relation to composite.. try to solve this
 145                     // FIXME: use adapter to get composite directly from resource
 146                     final Resource type = g.getSingleType(diagramOrComposite, sr.Component);
 147                     if (type == null)
 148                         return;
 149
 150                     final Resource definedBy = g.getPossibleObject(type, sr.IsDefinedBy);
 151                     if (definedBy == null)
 152                         return;
 153
 154                     this.structuralPath = new ResourceArray(diagramOrComposite);
 155                     diagram =  g.getPossibleObject(definedBy, mr.CompositeToDiagram);
 156                         }
 157
 158                 } else {
 159
 160                         Resource possibleSymbol = g.getPossibleObject(diagram, sr.Defines);
 161                         if(possibleSymbol != null && g.isInstanceOf(possibleSymbol, DIA.ElementClass)) isSymbol = true;
 162
 163                 }
 164
 165                         this.resource = diagram;
 166
 167         } catch (ManyObjectsForFunctionalRelationException e) {
 168             // TODO Auto-generated catch block
 169             e.printStackTrace();
 170         } catch (ServiceException e) {
 171             // TODO Auto-generated catch block
 172             e.printStackTrace();
 173         } catch (NoSingleResultException e) {
 174             // TODO Auto-generated catch block
 175             e.printStackTrace();
 176         }
 177     }
 178
 179     public GraphToDiagramSynchronizer getGraphToDiagramSynchronizer() {
 180         return synchronizer;
 181     }
 182
 183     protected CopyPasteStrategy getCopyPasteStrategy() {
 184                 try {
 185                         CopyPasteStrategy cpStrategy = Simantics.getSession().syncRequest(new PossibleAdapter<CopyPasteStrategy>(resource, CopyPasteStrategy.class));
 186                         if(cpStrategy != null) return cpStrategy;
 187                 } catch (DatabaseException e) {
 188                 }
 189                 return new DefaultCopyPasteStrategy();
 190     }
 191
 192     protected CopyAdvisor getCopyAdvisor() {
 193                 try {
 194                         CopyAdvisor advisor = Simantics.getSession().syncRequest(new PossibleAdapter<CopyAdvisor>(resource, CopyAdvisor.class));
 195                         if(advisor != null) return advisor;
 196                 } catch (DatabaseException e) {
 197                 }
 198                 return new MappedElementCopyAdvisor(new ElementCopyAdvisor(), new ComponentCopyAdvisor());
 199     }
 200
 201     protected void initContext(CanvasContext ctx) {
 202         boolean unlock = false;
 203         if (!ctx.isLocked()) {
 204             ctx.setLocked(true);
 205             unlock = true;
 206         }
 207
 208         IHintContext h = ctx.getDefaultHintContext();
 209
 210         // Support & Util Participants
 211         ctx.add( new TransformUtil() );
 212         ctx.add( new MouseUtil() );
 213         ctx.add( new KeyUtil() );
 214         ctx.add( new CanvasGrab() );
 215         ctx.add( new SymbolUtil() );
 216         ctx.add( new TimeParticipant() );
 217         ctx.add( new CanvasBoundsParticipant() );
 218         ctx.add( new Notifications() );
 219
 220         // SGFocusParticipant does not work for remote viewer at the moment.
 221         //ctx.add( new SGFocusParticipant() );
 222
 223         h.setHint(PointerPainter.KEY_PAINT_POINTER, true);
 224
 225         ctx.add( new PanZoomRotateHandler(navigation == null || navigation == true) );
 226         ctx.add( new MultitouchPanZoomRotateInteractor() );
 227         ctx.add( new ZoomToAreaHandler() );
 228         ctx.add( new SimpleElementTransformHandler() );
 229
 230         // Key bindings
 231         if(navigation == null || navigation == true)
 232             ctx.add( new KeyToCommand( CommandKeyBinding.DEFAULT_BINDINGS ) );
 233
 234         // Grid & Ruler & Background
 235         h.setHint(RulerPainter.KEY_RULER_ENABLED, false);
 236         h.setHint(GridPainter.KEY_GRID_ENABLED, false);
 237
 238         ctx.add( new GridPainter() );
 239         ctx.add( new RulerPainter() );
 240         ctx.add( new BackgroundPainter() );
 241
 242         h.setHint(Hints.KEY_DISPLAY_PAGE, Boolean.FALSE);
 243         h.setHint(Hints.KEY_DISPLAY_MARGINS, Boolean.TRUE);
 244         ctx.add( new PageBorderParticipant() );
 245
 246         h.setHint(Hints.KEY_GRID_COLOR, new Color(0.95f, 0.95f, 0.95f));
 247         h.setHint(Hints.KEY_BACKGROUND_COLOR, Color.WHITE);
 248         h.setHint(RulerPainter.KEY_RULER_BACKGROUND_COLOR, new Color(0.9f, 0.9f, 0.9f, 0.75f));
 249         h.setHint(RulerPainter.KEY_RULER_TEXT_COLOR, Color.BLACK);
 250
 251         ////// Diagram Participants //////
 252         ctx.add( new PointerInteractor(false, false, false, false, true, true, synchronizer.getElementClassProvider(), null) );
 253         ctx.add( new ElementInteractor() );
 254         ctx.add( new Selection() );
 255         ctx.add( new DiagramParticipant() );
 256         ctx.add( new ElementPainter(true) );
 257         ctx.add( new ConnectionCrossingsParticipant(resource));
 258
 259         //ctx.add( new ElementHeartbeater() );
 260         ctx.add( new ZOrderHandler() );
 261         ctx.add( new ZoomTransitionParticipant(TransitionFunction.SIGMOID) );
 262
 263         /////// D'n'D ///////
 264         ctx.add(new PopulateElementDropParticipant(synchronizer));
 265         ctx.add(new PopulateElementMonitorDropParticipant(synchronizer, 0.5, 0.5));
 266
 267         h.setHint(Hints.KEY_TOOL, Hints.POINTERTOOL);
 268
 269         h.setHint(PanZoomRotateHandler.KEY_ZOOM_IN_LIMIT, 1000.0);
 270         h.setHint(PanZoomRotateHandler.KEY_ZOOM_OUT_LIMIT, 10.0);
 271
 272         // Add visual browsing capabilities for structural models
 273         ISessionContext sessionContext = Simantics.getSessionContext();
 274         ctx.add(new HeadlessStructuralBrowsingHandler(this, sessionContext, structuralPath));
 275
 276         // Page settings
 277         PageDesc pageDesc = PageDesc.DEFAULT.withOrientation(PageOrientation.Landscape);
 278         // TODO: load page desc from graph
 279         h.setHint(Hints.KEY_PAGE_DESC, pageDesc);
 280
 281         ctx.add(new CopyPasteHandler(getCopyPasteStrategy()));
 282         ctx.add(new DeleteHandler(null));
 283
 284         if (resource != null)
 285             loadPageSettings(ctx, resource);
 286
 287         ctx.assertParticipantDependencies();
 288         if (unlock)
 289             ctx.setLocked(false);
 290     }
 291
 292     protected void loadPageSettings(ICanvasContext ctx, Resource diagramResource) {
 293         try {
 294             DiagramDesc diagramDesc = Simantics.getSession().syncRequest(DiagramRequests.getDiagramDesc(diagramResource));
 295             if (diagramDesc != null)
 296                 setDiagramDesc(ctx, diagramDesc);
 297
 298             // Create a listener to react to page setting changes.
 299             Simantics.getSession().asyncRequest(DiagramRequests.getDiagramDesc(diagramResource), new Listener<DiagramDesc>() {
 300                 @Override
 301                 public void execute(DiagramDesc result) {
 302                     if (result != null && ctx != null) {
 303                         ThreadUtils.asyncExec(ctx.getThreadAccess(), () -> {
 304                             if (ctx != null) {
 305                                 setDiagramDesc(ctx, result);
 306                             }
 307                         });
 308                     }
 309                 }
 310
 311                 @Override
 312                 public void exception(Throwable t) {
 313                     ErrorLogger.defaultLogError(t);
 314                 }
 315
 316                 @Override
 317                 public boolean isDisposed() {
 318                     return DiagramSceneGraphProvider.this.ctx == null;
 319                 }
 320             });
 321         } catch (DatabaseException e) {
 322             ErrorLogger.defaultLogError(e);
 323         }
 324     }
 325
 326     protected void setDiagramDesc(ICanvasContext ctx, DiagramDesc diagramDesc) {
 327         IHintContext hints = ctx.getDefaultHintContext();
 328         hints.setHint(Hints.KEY_PAGE_DESC, diagramDesc.getPageDesc());
 329         hints.setHint(Hints.KEY_DISPLAY_PAGE, diagramDesc.isPageBordersVisible());
 330         hints.setHint(Hints.KEY_DISPLAY_MARGINS, diagramDesc.isMarginsVisible());
 331     }
 332
 333     @Override
 334     public G2DSceneGraph initializeSceneGraph(G2DSceneGraph sg) {
 335         return initializeSceneGraph(sg, null);
 336     }
 337
 338     @Override
 339     public G2DSceneGraph initializeSceneGraph(G2DSceneGraph sg, String view) {
 340         return initializeSceneGraph(sg, "", "", view);
 341     }
 342
 343     @Override
 344     public G2DSceneGraph initializeSceneGraph(G2DSceneGraph sg, String modelURI, String RVI) {
 345         return initializeSceneGraph(sg, modelURI, RVI, "");
 346     }
 347
 348     @Override
 349     public G2DSceneGraph initializeSceneGraph(ICanvasContext context, String modelURI, String RVI) {
 350         G2DSceneGraph sg = context.getSceneGraph();
 351         return initializeSceneGraph(context, sg, modelURI, RVI, "");
 352     }
 353
 354     /**
 355      * @param sg
 356      * @param view
 357      * @param initialHints
 358      * @return
 359      */
 360     private G2DSceneGraph initializeSceneGraph(G2DSceneGraph sg, String modelURI, String RVI, String view) {
 361         IThreadWorkQueue thread = AWTThread.getThreadAccess();
 362         ctx = new CanvasContext(thread, sg); // By giving the scene graph instance as parameter, we can use external serializer
 363         return initializeSceneGraph(ctx, sg, modelURI, RVI, view);
 364     }
 365
 366     /**
 367      * @param sg
 368      * @param view
 369      * @param initialHints
 370      * @return
 371      */
 372     private G2DSceneGraph initializeSceneGraph(ICanvasContext context, G2DSceneGraph sg, String modelURI, String RVI, String view) {
 373         this.ctx = (CanvasContext) context;
 374         this.view = view;
 375         if(view != null) {
 376             //System.out.println("using layer '"+view+"'");
 377             initialHints.setHint(DiagramHints.KEY_FIXED_LAYERS, new String[] { view });
 378         }
 379
 380         try {
 381                 fillInitialDiagramHints(initialHints);
 382
 383             final RuntimeDiagramManager runtimeDiagramManager = RuntimeDiagramManager.create(Simantics.getSession(), resource, modelURI, RVI);
 384             VirtualGraphSupport support = Simantics.getSession().getService(VirtualGraphSupport.class);
 385
 386             synchronizer = Simantics.getSession().syncRequest(new Read<GraphToDiagramSynchronizer>() {
 387                 @Override
 388                 public GraphToDiagramSynchronizer perform(ReadGraph graph) throws DatabaseException {
 389                     DiagramResource dr = DiagramResource.getInstance(graph);
 390                     Boolean val = graph.getPossibleRelatedValue(resource, dr.NavigationEnabled, Bindings.BOOLEAN);
 391                     if(val != null && navigation == null) { // Set only if navigation has not been set manually
 392                         navigation = val;
 393                     }
 394                     VirtualGraph virtualGraph = support.getGraph(graph, resource);
 395                     GraphToDiagramSynchronizer sync;
 396                     if (virtualGraph != null) {
 397                         sync = new GraphToDiagramSynchronizer(graph, ctx,createElementClassProvider(graph), virtualGraph);
 398                     } else {
 399                         sync = new GraphToDiagramSynchronizer(graph, ctx,createElementClassProvider(graph));
 400                     }
 401
 402                     sync.set(ModelingSynchronizationHints.MODELING_RESOURCE, ModelingResources.getInstance(graph));
 403                     diagram = sync.loadDiagram(new NullProgressMonitor(), graph, null, resource, runtimeDiagramManager.getRuntimeDiagram(), structuralPath, initialHints); // FIXME
 404                     return sync;
 405                 }
 406             });
 407
 408         } catch (DatabaseException e) {
 409             // TODO Auto-generated catch block
 410             e.printStackTrace();
 411         }
 412         ctx.getDefaultHintContext().setHint(DiagramHints.KEY_DIAGRAM, diagram);
 413
 414         initContext(ctx);
 415
 416         return ctx.getSceneGraph();
 417     }
 418
 419     protected void fillInitialDiagramHints(IHintContext initialHints) throws DatabaseException {
 420           IModelingRules modelingRules = Simantics.getSession().syncRequest(DiagramRequests.getModelingRules(resource, null));
 421           if (modelingRules != null) {
 422               initialHints.setHint(DiagramModelHints.KEY_MODELING_RULES, modelingRules);
 423           }
 424
 425           initialHints.setHint(SynchronizationHints.COPY_ADVISOR, getCopyAdvisor());
 426     }
 427
 428     protected IElementClassProvider createElementClassProvider(ReadGraph graph) throws DatabaseException {
 429         DiagramResource dr = DiagramResource.getInstance(graph);
 430         return ElementClassProviders.mappedProvider(
 431                   ElementClasses.CONNECTION, DefaultConnectionClassFactory.CLASS.newClassWith(new StaticObjectAdapter(dr.Connection)),
 432                   ElementClasses.FLAG, FlagClassFactory.createFlagClass(dr.Flag, dr.Flag_Terminal)
 433         );
 434
 435     }
 436
 437     @Override
 438     public void dispose() {
 439         if(ctx != null) {
 440             if (ownsContext)
 441                 ctx.dispose();
 442             ctx = null;
 443         }
 444         if (synchronizer != null) {
 445             synchronizer.dispose();
 446             synchronizer = null;
 447         }
 448         if (diagram != null) {
 449             diagram.dispose();
 450             diagram = null;
 451         }
 452     }
 453
 454     /**
 455      * Hack for returning canvasContext for some special cases
 456      * this method brakes the interface, but this is not intended to be used in production context
 457      * @return
 458      */
 459     @Override
 460     public ICanvasContext getCanvasContext() {
 461         return ctx;
 462     }
 463
 464     @Override
 465     public AWTEventListener getEventListener() {
 466         if(ctx == null) return null;
 467         if(listener == null) {
 468             listener = new AWTRemoteEventAdapter(ctx, ctx.getEventQueue());
 469         }
 470         return listener;
 471     }
 472
 473     @Override
 474     public void updateDiagram(final ResourceArray structuralPath) {
 475         final IHintContext hints = new HintContext();
 476         if(view != null) {
 477             System.out.println("using layer '"+view+"'");
 478             hints.setHint(DiagramHints.KEY_FIXED_LAYERS, new String[] { view });
 479         }
 480
 481         try {
 482             // FIXME: I have no idea if this works or not..
 483             diagram = Simantics.getSession().syncRequest(new Read<IDiagram>() {
 484                 @Override
 485                 public IDiagram perform(ReadGraph graph) throws DatabaseException {
 486                     IDiagram d = synchronizer.loadDiagram(new NullProgressMonitor(), graph, null, structuralPath.resources[0], null, structuralPath.removeFromBeginning(0), hints);
 487                     return d;
 488                 }
 489             });
 490             ctx.getDefaultHintContext().setHint(DiagramHints.KEY_DIAGRAM, diagram);
 491         } catch (DatabaseException e) {
 492             // TODO Auto-generated catch block
 493             e.printStackTrace();
 494         }
 495     }
 496
 497     public void setExperiment(ReadGraph g, String identifier) {
 498         if(diagram == null) return;
 499         diagram.setHint(DiagramModelHints.KEY_ACTIVE_EXPERIMENT, identifier);
 500         initialHints.setHint(DiagramModelHints.KEY_ACTIVE_EXPERIMENT, identifier);
 501
 502 //              try {
 503 //                      DiagramExperiment.setActiveExperiment(g, diagram, (String)identifier);
 504 //              } catch (DatabaseException e) {
 505 //                      // TODO Auto-generated catch block
 506 //                      e.printStackTrace();
 507 //              }
 508
 509     }
 510
 511     /**
 512      * Supported keys:
 513      *     DiagramModelHints.KEY_SESSION_ID
 514      *     DiagramHints.KEY_NAVIGATION_ENABLED
 515      */
 516     @Override
 517     public void setHint(Object key, Object value) {
 518         if(DiagramModelHints.KEY_SESSION_ID.equals(key)) {
 519             if(diagram != null)
 520                 diagram.setHint(DiagramModelHints.KEY_SESSION_ID, value);
 521             initialHints.setHint(DiagramModelHints.KEY_SESSION_ID, value);
 522         } else if(DiagramModelHints.KEY_ACTIVE_EXPERIMENT.equals(key)) {
 523             if(diagram != null)
 524                 diagram.setHint(DiagramModelHints.KEY_ACTIVE_EXPERIMENT, value);
 525             initialHints.setHint(DiagramModelHints.KEY_ACTIVE_EXPERIMENT, value);
 526         } else if(DiagramHints.KEY_NAVIGATION_ENABLED.equals(key)) {
 527             navigation = (Boolean)value;
 528         }
 529     }
 530 }