bundles/org.simantics.modeling.ui/src/org/simantics/modeling/ui/diagramEditor/DiagramViewer.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2019 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  *     Semantum Oy - issue #4384, gitlab #399
  12  *******************************************************************************/
  13 package org.simantics.modeling.ui.diagramEditor;
  14
  15 import java.awt.Color;
  16 import java.awt.dnd.DnDConstants;
  17 import java.util.Collections;
  18 import java.util.Set;
  19 import java.util.concurrent.TimeUnit;
  20 import java.util.function.Supplier;
  21
  22 import org.eclipse.core.runtime.Assert;
  23 import org.eclipse.core.runtime.IAdaptable;
  24 import org.eclipse.core.runtime.IProgressMonitor;
  25 import org.eclipse.core.runtime.SubMonitor;
  26 import org.eclipse.core.runtime.jobs.Job;
  27 import org.eclipse.jface.action.IStatusLineManager;
  28 import org.eclipse.jface.resource.JFaceResources;
  29 import org.eclipse.jface.resource.LocalResourceManager;
  30 import org.eclipse.swt.widgets.Composite;
  31 import org.eclipse.swt.widgets.Display;
  32 import org.eclipse.ui.IEditorInput;
  33 import org.eclipse.ui.IEditorSite;
  34 import org.eclipse.ui.IWorkbenchPartSite;
  35 import org.eclipse.ui.contexts.IContextService;
  36 import org.eclipse.ui.views.contentoutline.IContentOutlinePage;
  37 import org.simantics.Simantics;
  38 import org.simantics.browsing.ui.model.browsecontexts.BrowseContext;
  39 import org.simantics.db.ReadGraph;
  40 import org.simantics.db.Resource;
  41 import org.simantics.db.Session;
  42 import org.simantics.db.WriteGraph;
  43 import org.simantics.db.common.primitiverequest.PossibleAdapter;
  44 import org.simantics.db.common.primitiverequest.PossibleObject;
  45 import org.simantics.db.common.procedure.adapter.ListenerDelegate;
  46 import org.simantics.db.common.procedure.adapter.ListenerSupport;
  47 import org.simantics.db.common.request.ParametrizedRead;
  48 import org.simantics.db.common.request.TypeURIs;
  49 import org.simantics.db.common.request.WriteRequest;
  50 import org.simantics.db.common.utils.CommonDBUtils;
  51 import org.simantics.db.common.utils.TagUtil;
  52 import org.simantics.db.exception.DatabaseException;
  53 import org.simantics.db.layer0.request.combinations.Combinators;
  54 import org.simantics.db.management.ISessionContext;
  55 import org.simantics.db.management.ISessionContextProvider;
  56 import org.simantics.db.request.Read;
  57 import org.simantics.diagram.DiagramTypeUtils;
  58 import org.simantics.diagram.adapter.FlagClassFactory;
  59 import org.simantics.diagram.adapter.GraphToDiagramSynchronizer;
  60 import org.simantics.diagram.adapter.IDiagramLoader;
  61 import org.simantics.diagram.connection.ModelledConnectionAdvisor;
  62 import org.simantics.diagram.handler.ConnectionCommandHandler;
  63 import org.simantics.diagram.handler.CopyPasteHandler;
  64 import org.simantics.diagram.handler.CopyPasteStrategy;
  65 import org.simantics.diagram.handler.DefaultCopyPasteStrategy;
  66 import org.simantics.diagram.handler.DeleteHandler;
  67 import org.simantics.diagram.handler.ExpandSelectionHandler;
  68 import org.simantics.diagram.handler.SimpleElementTransformHandler;
  69 import org.simantics.diagram.layer.ILayersViewPage;
  70 import org.simantics.diagram.participant.ContextUtil;
  71 import org.simantics.diagram.participant.PointerInteractor2;
  72 import org.simantics.diagram.participant.SGFocusParticipant;
  73 import org.simantics.diagram.query.DiagramRequests;
  74 import org.simantics.diagram.runtime.RuntimeDiagramManager;
  75 import org.simantics.diagram.stubs.DiagramResource;
  76 import org.simantics.diagram.symbolcontribution.SymbolProviderFactory;
  77 import org.simantics.diagram.synchronization.CopyAdvisor;
  78 import org.simantics.diagram.synchronization.IModifiableSynchronizationContext;
  79 import org.simantics.diagram.synchronization.SynchronizationHints;
  80 import org.simantics.diagram.synchronization.graph.DiagramGraphUtil;
  81 import org.simantics.diagram.ui.DiagramModelHints;
  82 import org.simantics.diagram.ui.SWTPopupMenuParticipant;
  83 import org.simantics.diagram.ui.SWTPopupMenuParticipantAwt;
  84 import org.simantics.diagram.ui.WorkbenchSelectionProvider;
  85 import org.simantics.g2d.canvas.Hints;
  86 import org.simantics.g2d.canvas.ICanvasContext;
  87 import org.simantics.g2d.canvas.ICanvasParticipant;
  88 import org.simantics.g2d.canvas.impl.CanvasContext;
  89 import org.simantics.g2d.chassis.AWTChassis;
  90 import org.simantics.g2d.chassis.ICanvasChassis;
  91 import org.simantics.g2d.chassis.IChassisListener;
  92 import org.simantics.g2d.chassis.SWTChassis;
  93 import org.simantics.g2d.connection.IConnectionAdvisor;
  94 import org.simantics.g2d.diagram.DiagramClass;
  95 import org.simantics.g2d.diagram.DiagramHints;
  96 import org.simantics.g2d.diagram.IDiagram;
  97 import org.simantics.g2d.diagram.handler.PickRequest.PickFilter;
  98 import org.simantics.g2d.diagram.impl.Diagram;
  99 import org.simantics.g2d.diagram.participant.DelayedBatchElementPainter;
 100 import org.simantics.g2d.diagram.participant.DiagramParticipant;
 101 import org.simantics.g2d.diagram.participant.ElementInteractor;
 102 import org.simantics.g2d.diagram.participant.ElementPainter;
 103 import org.simantics.g2d.diagram.participant.Selection;
 104 import org.simantics.g2d.diagram.participant.TerminalPainter;
 105 import org.simantics.g2d.diagram.participant.ZOrderHandler;
 106 import org.simantics.g2d.diagram.participant.pointertool.PointerInteractor;
 107 import org.simantics.g2d.element.ElementClassProviders;
 108 import org.simantics.g2d.element.ElementClasses;
 109 import org.simantics.g2d.element.ElementUtils;
 110 import org.simantics.g2d.element.IElement;
 111 import org.simantics.g2d.element.IElementClassProvider;
 112 import org.simantics.g2d.element.handler.impl.StaticObjectAdapter;
 113 import org.simantics.g2d.elementclass.connection.ConnectionClass;
 114 import org.simantics.g2d.page.DiagramDesc;
 115 import org.simantics.g2d.participant.BackgroundPainter;
 116 import org.simantics.g2d.participant.CanvasBoundsParticipant;
 117 import org.simantics.g2d.participant.CanvasGrab;
 118 import org.simantics.g2d.participant.GridPainter;
 119 import org.simantics.g2d.participant.KeyUtil;
 120 import org.simantics.g2d.participant.MouseUtil;
 121 import org.simantics.g2d.participant.Notifications;
 122 import org.simantics.g2d.participant.PageBorderParticipant;
 123 import org.simantics.g2d.participant.PanZoomRotateHandler;
 124 import org.simantics.g2d.participant.PointerPainter;
 125 import org.simantics.g2d.participant.RenderingQualityInteractor;
 126 import org.simantics.g2d.participant.RulerPainter;
 127 import org.simantics.g2d.participant.SymbolUtil;
 128 import org.simantics.g2d.participant.TimeParticipant;
 129 import org.simantics.g2d.participant.TransformUtil;
 130 import org.simantics.g2d.participant.WorkbenchStatusLine;
 131 import org.simantics.g2d.participant.ZoomToAreaHandler;
 132 import org.simantics.g2d.tooltip.TerminalTooltipParticipant;
 133 import org.simantics.g2d.utils.CanvasUtils;
 134 import org.simantics.layer0.utils.triggers.IActivation;
 135 import org.simantics.layer0.utils.triggers.IActivationManager;
 136 import org.simantics.modeling.ModelingResources;
 137 import org.simantics.modeling.mapping.ComponentCopyAdvisor;
 138 import org.simantics.modeling.mapping.ElementCopyAdvisor;
 139 import org.simantics.modeling.mapping.MappedElementCopyAdvisor;
 140 import org.simantics.modeling.mapping.ModelingSynchronizationHints;
 141 import org.simantics.modeling.ui.diagramEditor.handlers.LinkBrowsingHandler;
 142 import org.simantics.modeling.ui.diagramEditor.handlers.StructuralBrowsingHandler;
 143 import org.simantics.modeling.ui.preferences.DiagramPreferenceUtil;
 144 import org.simantics.modeling.ui.preferences.DiagramPreferences;
 145 import org.simantics.project.ontology.ProjectResource;
 146 import org.simantics.scenegraph.INode;
 147 import org.simantics.scenegraph.g2d.snap.GridSnapAdvisor;
 148 import org.simantics.scenegraph.utils.NodeUtil;
 149 import org.simantics.selectionview.StandardPropertyPage;
 150 import org.simantics.structural.stubs.StructuralResource2;
 151 import org.simantics.structural2.modelingRules.IModelingRules;
 152 import org.simantics.ui.SimanticsUI;
 153 import org.simantics.ui.jobs.SessionGarbageCollectorJob;
 154 import org.simantics.ui.workbench.IPropertyPage;
 155 import org.simantics.ui.workbench.IResourceEditorInput;
 156 import org.simantics.ui.workbench.IResourceEditorInput2;
 157 import org.simantics.ui.workbench.TitleRequest;
 158 import org.simantics.ui.workbench.TitleUpdater;
 159 import org.simantics.ui.workbench.ToolTipRequest;
 160 import org.simantics.ui.workbench.editor.input.InputValidationCombinators;
 161 import org.simantics.utils.DataContainer;
 162 import org.simantics.utils.datastructures.hints.HintContext;
 163 import org.simantics.utils.datastructures.hints.HintListenerAdapter;
 164 import org.simantics.utils.datastructures.hints.IHintContext;
 165 import org.simantics.utils.datastructures.hints.IHintContext.Key;
 166 import org.simantics.utils.datastructures.hints.IHintListener;
 167 import org.simantics.utils.datastructures.hints.IHintObservable;
 168 import org.simantics.utils.threads.AWTThread;
 169 import org.simantics.utils.threads.IThreadWorkQueue;
 170 import org.simantics.utils.threads.SWTThread;
 171 import org.simantics.utils.threads.ThreadUtils;
 172 import org.simantics.utils.ui.ErrorLogger;
 173 import org.simantics.utils.ui.ExceptionUtils;
 174
 175 import com.kitfox.svg.SVGCache;
 176
 177 /**
 178  * @author Toni Kalajainen
 179  * @author Tuukka Lehtonen
 180  */
 181 public class DiagramViewer
 182   //extends EditorPart implements IResourceEditorPart2,
 183     implements ListenerSupport, IAdaptable {
 184
 185     public interface DiagramViewerHost {
 186         void doSetPartName(String name);
 187         void doSetTitleToolTip(String name);
 188     }
 189
 190     public static final String                      DIAGRAMMING_CONTEXT      = "org.simantics.modeling.ui.diagramming"; //$NON-NLS-1$
 191     private static final String                     PREFERENCE_VIRTUAL_GRAPH = "preferences"; //$NON-NLS-1$
 192
 193     private static final boolean                    PROFILE                  = false;
 194
 195     ParametrizedRead<IResourceEditorInput, Boolean> INPUT_VALIDATOR =
 196         Combinators.compose(
 197                 InputValidationCombinators.or(
 198                         // Normal configuration diagrams of a model
 199                         Combinators.compose(
 200                                 InputValidationCombinators.hasURI(),
 201                                 InputValidationCombinators.partialFunction(ModelingResources.URIs.DiagramToComposite)
 202                         ),
 203                         // Configuration diagrams of a component type
 204                         Combinators.compose(
 205                                 InputValidationCombinators.hasURI(),
 206                                 Combinators.compose(
 207                                         InputValidationCombinators.partialFunction(StructuralResource2.URIs.Defines),
 208                                         InputValidationCombinators.partialFunction(ModelingResources.URIs.DiagramToComposite)
 209                                 )
 210                         )
 211                 ),
 212                 InputValidationCombinators.extractInputResource()
 213         );
 214
 215     protected EditorState                editorState;
 216
 217     protected boolean                    disposed           = false;
 218     protected IThreadWorkQueue           swt;
 219     protected IStatusLineManager         statusLineManager;
 220     protected Display                    display;
 221     protected LocalResourceManager       resourceManager;
 222     protected SWTChassis                 c;
 223     protected IDiagram                   sourceDiagram;
 224     protected DataContainer<IDiagram>    sourceDiagramContainer;
 225     protected CanvasContext              canvasContext;
 226     protected ISessionContextProvider    sessionContextProvider;
 227     protected ISessionContext            sessionContext;
 228     protected Resource                   diagramResource;
 229     protected GraphToDiagramSynchronizer synchronizer;
 230     protected IActivation                activation;
 231     protected ContextUtil                contextUtil;
 232     protected SWTPopupMenuParticipant    popupMenuParticipant;
 233
 234     protected DiagramPreferences         diagramPreferences;
 235     protected DiagramDesc                diagramDesc;
 236     protected GridSnapAdvisor            snapAdvisor;
 237
 238     private RuntimeDiagramManager        runtimeDiagramManager;
 239     private Resource                     runtimeDiagramResourceCache;
 240     private HasDiagramSourceListener     hasDiagramSourceListener;
 241
 242     /**
 243      * Set externally in
 244      * {@link #init(DiagramViewerHost, IEditorSite, IEditorInput, DataContainer, WorkbenchSelectionProvider)}
 245      * .
 246      */
 247     protected WorkbenchSelectionProvider selectionProvider;
 248
 249     protected Resource getRuntimeFromManager() {
 250         RuntimeDiagramManager rtdm = runtimeDiagramManager;
 251         return (rtdm == null) ? null : rtdm.getRuntimeDiagram();
 252     }
 253
 254     public Resource getRuntime() {
 255         if (runtimeDiagramResourceCache != null)
 256             return runtimeDiagramResourceCache;
 257         runtimeDiagramResourceCache = getRuntimeFromManager();
 258         return runtimeDiagramResourceCache;
 259     }
 260
 261     public ParametrizedRead<IResourceEditorInput, Boolean> getInputValidator() {
 262         return INPUT_VALIDATOR;
 263     }
 264
 265     protected void addDropParticipants(ICanvasContext ctx) {
 266         ctx.getDefaultHintContext().setHint(Hints.KEY_ALLOWED_DRAG_ACTIONS, DnDConstants.ACTION_COPY);
 267
 268         ctx.add(new PopulateElementDropParticipant(synchronizer, getSite()));
 269         ctx.add(new PopulateElementMonitorDropParticipant(synchronizer, 0.5, 0.5));
 270     }
 271
 272     protected CopyPasteStrategy getCopyPasteStrategy() {
 273                 try {
 274                         CopyPasteStrategy cpStrategy = Simantics.getSession().syncRequest(new PossibleAdapter<CopyPasteStrategy>(getInputResource(), CopyPasteStrategy.class));
 275                         if(cpStrategy != null) return cpStrategy;
 276                 } catch (DatabaseException e) {
 277                 }
 278                 return getDefaultCopyPasteStrategy();
 279     }
 280
 281     protected CopyPasteStrategy getDefaultCopyPasteStrategy() {
 282         return new DefaultCopyPasteStrategy();
 283     }
 284
 285     protected CopyAdvisor getCopyAdvisor() {
 286                 try {
 287                         CopyAdvisor advisor = Simantics.getSession().syncRequest(new PossibleAdapter<CopyAdvisor>(getInputResource(), CopyAdvisor.class));
 288                         if(advisor != null) return advisor;
 289                 } catch (DatabaseException e) {
 290                 }
 291                 return new MappedElementCopyAdvisor(new ElementCopyAdvisor(), new ComponentCopyAdvisor());
 292     }
 293
 294     /**
 295      * @param ctx
 296      * TODO: change argument from CanvasContext to ICanvasContext
 297      */
 298     protected void addKeyBindingParticipants(CanvasContext ctx) {
 299         //ctx.add( new KeyToCommand( CommandKeyBinding.DEFAULT_BINDINGS ) );
 300         ctx.add(new DeleteHandler(statusLineManager));
 301         ctx.add(new CopyPasteHandler(getCopyPasteStrategy(), statusLineManager).setWorkbenchSite(getEditorSite()));
 302         ctx.add(new ConnectionCommandHandler());
 303     }
 304
 305     protected void addPopupmenu(ICanvasContext ctx) {
 306         ctx.add(popupMenuParticipant);
 307     }
 308
 309     protected void addWorkbenchSelectionProvider(ICanvasContext ctx) {
 310         if (selectionProvider != null)
 311             ctx.add(selectionProvider);
 312     }
 313
 314     protected void addViewManipulationParticipants(CanvasContext ctx) {
 315         ctx.add(new PanZoomRotateHandler());
 316         //ctx.add(new MousePanZoomInteractor());
 317         //ctx.add(new MultitouchPanZoomRotateInteractor());
 318         // ctx.add( new OrientationRestorer() );
 319         ctx.add(new ZoomToAreaHandler());
 320     }
 321
 322     protected void addDiagramParticipants(ICanvasContext ctx) {
 323         ctx.add(new ZOrderHandler());
 324         ctx.add(getPointerInteractor());
 325         ctx.add(new ElementInteractor());
 326         ctx.add(new Selection());
 327         ctx.add(new DiagramParticipant());
 328         ctx.add(new ElementPainter());
 329         //ctx.add(new ElementHeartbeater());
 330         //ctx.add(new ZoomTransitionParticipant(TransitionFunction.SIGMOID));
 331         //ctx.add(new TooltipParticipant());
 332         ctx.add(new TerminalTooltipParticipant());
 333     }
 334
 335     protected void addPainterParticipants(ICanvasContext ctx) {
 336         ctx.add(new RenderingQualityInteractor());
 337         ctx.add(new TerminalPainter(true, true, false, true));
 338         ctx.add(new DelayedBatchElementPainter(PickFilter.FILTER_MONITORS, 500, TimeUnit.MILLISECONDS));
 339     }
 340
 341     protected void addStructureParticipants(ICanvasContext ctx) {
 342         addWorkbenchSelectionProvider(ctx);
 343         // Add visual browsing capabilities for structural models
 344         ctx.add(new StructuralBrowsingHandler(getSite(), sessionContext, getResourceInput2()));
 345         ctx.add(new LinkBrowsingHandler(getSite(), this, sessionContext));
 346     }
 347
 348     /**
 349      * Override to add any diagram/canvas participants to the canvas context
 350      * initialized for the editor.
 351      *
 352      * @param ctx
 353      */
 354     protected void addOtherParticipants(CanvasContext ctx) {
 355     }
 356
 357     public static Set<String> defaultPropertyBrowseContexts = Collections.singleton(ProjectResource.URIs.ProjectBrowseContext);
 358
 359     protected Set<String> getPropertyPageContexts() {
 360         try {
 361             return BrowseContext.getBrowseContextClosure(Simantics.getSession(), defaultPropertyBrowseContexts);
 362         } catch (DatabaseException e) {
 363             ExceptionUtils.logAndShowError(Messages.DiagramViewer_FailedtoLoadModeled, e);
 364             return defaultPropertyBrowseContexts;
 365         }
 366     }
 367
 368     protected IPropertyPage createPropertyPage(IWorkbenchPartSite site, Set<String> contexts) {
 369         return new StandardPropertyPage(site, contexts);
 370     }
 371
 372     protected String getPopupId() {
 373         return "#ModelingDiagramPopup"; //$NON-NLS-1$
 374     }
 375
 376     protected void getPreferences() {
 377         this.diagramPreferences = DiagramPreferenceUtil.getPreferences();
 378     }
 379
 380     protected void initSession() {
 381         sessionContextProvider = Simantics.getSessionContextProvider();
 382         sessionContext = sessionContextProvider.getSessionContext();
 383     }
 384
 385     protected void readNames() {
 386         String name = getEditorInput().getName();
 387         host.doSetPartName(name);
 388         host.doSetTitleToolTip(name);
 389     }
 390
 391     class ChassisListener implements IChassisListener {
 392         @Override
 393         public void chassisClosed(ICanvasChassis sender) {
 394             // Prevent deadlock while disposing which using syncExec would result in.
 395             final ICanvasContext ctx = canvasContext;
 396             ThreadUtils.asyncExec(ctx.getThreadAccess(), new Runnable() {
 397                 @Override
 398                 public void run() {
 399                     if (ctx != null) {
 400                         saveEditorState(ctx);
 401                         ctx.getHintStack().removeKeyHintListener(GridPainter.KEY_GRID_ENABLED, canvasHintListener);
 402                         ctx.getHintStack().removeKeyHintListener(RulerPainter.KEY_RULER_ENABLED, canvasHintListener);
 403                         final AWTChassis awtChassis = c.getAWTComponent();
 404                         if (awtChassis != null)
 405                             awtChassis.setCanvasContext(null);
 406                         ctx.dispose();
 407                     }
 408
 409                     if (sourceDiagramContainer != null) {
 410                         sourceDiagramContainer.set(null);
 411                         sourceDiagramContainer = null;
 412                     }
 413
 414                     if (sourceDiagram != null)
 415                         sourceDiagram.dispose();
 416
 417                     if(synchronizer != null) {
 418                         synchronizer.dispose();
 419                         // Let GC work.
 420                         synchronizer = null;
 421                     }
 422
 423                     if (runtimeDiagramManager != null) {
 424                         runtimeDiagramManager.dispose();
 425                         runtimeDiagramManager = null;
 426                     }
 427                 }
 428             });
 429             c.removeChassisListener(ChassisListener.this);
 430         }
 431     }
 432
 433     protected void createChassis(Composite parent) {
 434         resourceManager = new LocalResourceManager(JFaceResources.getResources(), parent);
 435         c = new SWTChassis(parent, 0);
 436
 437         Object task = BEGIN("DV.precreateParticipants"); //$NON-NLS-1$
 438         createCustomParticipants();
 439         END(task);
 440
 441         c.populate(component -> {
 442             if (!disposed) {
 443                 c.addChassisListener(new ChassisListener());
 444                 initializeCanvas();
 445             }
 446         });
 447     }
 448
 449     protected void beforeSetCanvasContext(ICanvasContext canvasContext2) {
 450     }
 451
 452     /**
 453      * Invoke this only from the AWT thread.
 454      * @param context
 455      */
 456     protected void setCanvasContext(ICanvasContext context) {
 457         // Cannot directly invoke SWTChassis.setCanvasContext only because it
 458         // needs to be invoked in the SWT thread and AWTChassis.setCanvasContext in the
 459         // AWT thread, but directly invoking SWTChassis.setCanvasContext would call both
 460         // in the SWT thread which would cause synchronous scheduling of AWT
 461         // runnables which is always a potential source of deadlocks.
 462         c.getAWTComponent().setCanvasContext(canvasContext);
 463         swt.asyncExec(new Runnable() {
 464             @Override
 465             public void run() {
 466                 if (!c.isDisposed())
 467                     // For AWT, this is a no-operation.
 468                     c.setCanvasContext(canvasContext);
 469             }
 470         });
 471     }
 472
 473     public void createPartControl(Composite parent) {
 474         //ProfileObserver.begin = System.nanoTime();
 475         display = parent.getDisplay();
 476         swt = SWTThread.getThreadAccess(display);
 477         statusLineManager = getEditorSite().getActionBars().getStatusLineManager();
 478
 479         Object task = BEGIN("DV.initSession"); //$NON-NLS-1$
 480         initSession();
 481         END(task);
 482
 483         diagramResource = getInputResource();
 484         readNames();
 485         getPreferences();
 486
 487         try {
 488             this.runtimeDiagramManager = RuntimeDiagramManager.track(sessionContext.getSession(), diagramResource, getEditorInput(), this);
 489
 490             // Create the canvas context here before finishing createPartControl
 491             // to give DiagramViewerActionContributor a chance to work.
 492             // The context can be created in SWT thread without scheduling
 493             // to the context thread and having potential deadlocks.
 494             IThreadWorkQueue thread = AWTThread.getThreadAccess();
 495             this.canvasContext = new CanvasContext(thread);
 496             this.canvasContext.setLocked(true);
 497
 498             task = BEGIN("DV.createChassis"); //$NON-NLS-1$
 499             createChassis(parent);
 500             END(task);
 501         } catch (DatabaseException e) {
 502             ErrorLogger.defaultLogError(e);
 503         }
 504     }
 505
 506
 507         /**
 508      * A method invoked before chassis construction for creating such
 509      * {@link ICanvasParticipant}s that need to be constructed in the SWT
 510      * thread.
 511      *
 512      * Use it for creating any such canvas participants during the viewer
 513      * construction and add them to the {@link ICanvasContext} later on from
 514      * the AWT thread.
 515      */
 516     protected void createCustomParticipants() {
 517         if (SimanticsUI.isLinuxGTK()) {
 518                 popupMenuParticipant = new SWTPopupMenuParticipantAwt(getSite(), c, display, getPopupId());
 519         } else {
 520                 popupMenuParticipant = new SWTPopupMenuParticipant(getSite(), c, display, getPopupId());
 521         }
 522     }
 523
 524     /**
 525      * Invoke this only from the AWT thread.
 526      */
 527     protected void initializeCanvas() {
 528         Object canvasInit = BEGIN("DV.canvasInitialization"); //$NON-NLS-1$
 529
 530         Object task = BEGIN("DV.createViewerCanvas"); //$NON-NLS-1$
 531         initializeCanvasContext(canvasContext);
 532         END(task);
 533
 534         beforeSetCanvasContext(canvasContext);
 535         //FullscreenUtils.addFullScreenHandler(canvasContext, s, canvasProvider);
 536
 537         // Without this all diagram participants will crash like there's no tomorrow.
 538         // Just trying to keep the behavior a bit more sane in case of
 539         // errors instead of flooding the console with exceptions.
 540         canvasContext.getDefaultHintContext().setHint(DiagramHints.KEY_DIAGRAM, Diagram.spawnNew(DiagramClass.DEFAULT));
 541
 542         // Changes in ruler/grid activity shall be written as
 543         // workspace-persistent diagram-specific preferences.
 544         canvasContext.getHintStack().addKeyHintListener(GridPainter.KEY_GRID_ENABLED, canvasHintListener);
 545         canvasContext.getHintStack().addKeyHintListener(RulerPainter.KEY_RULER_ENABLED, canvasHintListener);
 546
 547         task = BEGIN("DV.setCanvasContext"); //$NON-NLS-1$
 548         setCanvasContext(canvasContext);
 549         END(task);
 550
 551         // Finish loading in a worker thread because it may be a time consuming
 552         // process to load a large diagram and we don't want unnecessary AWT
 553         // thread contention.
 554         Job loadJob = new DiagramViewerLoadJob(this);
 555         loadJob.schedule();
 556
 557         END(canvasInit);
 558     }
 559
 560     protected void activateUiContexts(ContextUtil util) {
 561         util.activate(DIAGRAMMING_CONTEXT);
 562     }
 563
 564     /**
 565      * @param monitor the progress monitor to use for reporting progress to the
 566      *        user. It is the caller's responsibility to call done() on the
 567      *        given monitor. Accepts <code>null</code>, indicating that no
 568      *        progress should be reported and that the operation cannot be
 569      *        cancelled.
 570      */
 571     protected void performActivation(IProgressMonitor monitor) {
 572         SubMonitor progress = SubMonitor.convert(monitor, Messages.DiagramViewer_MonitorActivateMapping, 100);
 573         IActivationManager activationManager = sessionContext.getSession().peekService(IActivationManager.class);
 574         if (activationManager != null) {
 575             activation = activationManager.activate(diagramResource);
 576         }
 577         progress.worked(100);
 578     }
 579
 580     protected void onCreated() {
 581     }
 582
 583     /**
 584      * @param diagram
 585      */
 586     protected void scheduleZoomToFit(IDiagram diagram) {
 587         if (diagram == null)
 588             throw new IllegalStateException("diagram is null"); //$NON-NLS-1$
 589
 590         CanvasUtils.scheduleZoomToFit(swt, () -> disposed, canvasContext, diagram);
 591     }
 592
 593     /**
 594      * Subclasses may override but should always invoke super.
 595      *
 596      * @param diagram
 597      * @param initialHints
 598      * @throws DatabaseException
 599      */
 600     protected void fillInitialDiagramHints(Resource diagram, IHintContext initialHints) throws DatabaseException {
 601         IModelingRules modelingRules = sessionContext.getSession().syncRequest(
 602                 DiagramRequests.getModelingRules(diagram, null));
 603         if (modelingRules != null) {
 604             initialHints.setHint(DiagramModelHints.KEY_MODELING_RULES, modelingRules);
 605             initialHints.setHint(DiagramHints.CONNECTION_ADVISOR,
 606                     getConnectionAdvisor(modelingRules, sessionContext.getSession()));
 607         }
 608
 609         initialHints.setHint(SynchronizationHints.COPY_ADVISOR, getCopyAdvisor());
 610         initialHints.setHint(DiagramHints.KEY_USE_CONNECTION_FLAGS, Boolean.TRUE);
 611         initialHints.setHint(DiagramHints.KEY_ALLOW_CONNECTION_BRANCHING, Boolean.TRUE);
 612         initialHints.setHint(DiagramHints.KEY_ALLOW_ROUTE_POINTS, Boolean.TRUE);
 613     }
 614
 615     /**
 616      * @param monitor the progress monitor to use for reporting progress to the
 617      *        user. It is the caller's responsibility to call done() on the
 618      *        given monitor. Accepts <code>null</code>, indicating that no
 619      *        progress should be reported and that the operation cannot be
 620      *        cancelled.
 621      * @param r
 622      * @return
 623      * @throws DatabaseException
 624      */
 625     protected IDiagram loadDiagram(IProgressMonitor monitor, final Resource r) throws DatabaseException {
 626         // Pre-load modeling rules and possibly other hints too since they are
 627         // needed already while loading the diagram contents.
 628         IHintContext initialHints = new HintContext();
 629         fillInitialDiagramHints(r, initialHints);
 630         IDiagram d = loadDiagram(monitor, r, initialHints);
 631         return d;
 632     }
 633
 634     /**
 635      * @param monitor the progress monitor to use for reporting progress to the
 636      *        user. It is the caller's responsibility to call done() on the
 637      *        given monitor. Accepts <code>null</code>, indicating that no
 638      *        progress should be reported and that the operation cannot be
 639      *        cancelled.
 640      * @param diagram
 641      * @param initialHints
 642      * @return
 643      * @throws DatabaseException
 644      */
 645     protected IDiagram loadDiagram(IProgressMonitor monitor, Resource diagram, IHintContext initialHints) throws DatabaseException {
 646         RuntimeDiagramManager rtdm = runtimeDiagramManager;
 647         Resource runtimeDiagram = rtdm != null ? rtdm.getRuntimeDiagram() : null;
 648         IDiagramLoader loader = synchronizer;
 649         if (rtdm == null || runtimeDiagram == null || loader == null)
 650             return null;
 651         IDiagram d = sessionContext.getSession().syncRequest((Read<IDiagram>) graph -> {
 652             IDiagram result = DiagramRequests.loadDiagram(monitor, getResourceInput2().getModel(null), diagram,
 653                     runtimeDiagram, null, loader, initialHints).perform(graph);
 654
 655             // #399: Enable certain PropertyTester implementation without database transactions
 656             ModelingResources MOD = ModelingResources.getInstance(graph);
 657             Resource composite = graph.getPossibleObject(diagram, MOD.DiagramToComposite);
 658             result.setHint(
 659                     DiagramModelHints.KEY_DIAGRAM_RESOURCE_TYPE_URIS,
 660                     graph.syncRequest(new TypeURIs(diagram)));
 661             result.setHint(
 662                     DiagramModelHints.KEY_MAPPED_COMPOSITE_RESOURCE_TYPE_URIS,
 663                     composite != null ? graph.syncRequest(new TypeURIs(composite)) : Collections.emptySet());
 664
 665             Resource diagramSource = graph.syncRequest(
 666                     new PossibleObject(diagram, MOD.HasDiagramSource),
 667                     hasDiagramSourceListener = new HasDiagramSourceListener(sourceDiagramContainer));
 668             ElementUtils.setOrRemoveHint(
 669                     result,
 670                     DiagramModelHints.KEY_HAS_DIAGRAM_SOURCE,
 671                     diagramSource);
 672
 673             return result;
 674         });
 675         return d;
 676     }
 677
 678     protected void beforeSetDiagram(IDiagram diagram) {
 679     }
 680
 681     protected PointerInteractor getPointerInteractor() {
 682         return new PointerInteractor2(true, true, true, false, true, false, synchronizer.getElementClassProvider());
 683     }
 684
 685     protected IConnectionAdvisor getConnectionAdvisor(IModelingRules modelingRules, Session session) {
 686         return new ModelledConnectionAdvisor(modelingRules, sessionContext.getSession());
 687     }
 688
 689     protected GraphToDiagramSynchronizer createSynchronizer(final ICanvasContext ctx, final ISessionContext sessionContext) {
 690         try {
 691             return sessionContext.getSession().syncRequest(new Read<GraphToDiagramSynchronizer>() {
 692                 @Override
 693                 public GraphToDiagramSynchronizer perform(ReadGraph graph) throws DatabaseException {
 694                     GraphToDiagramSynchronizer sync = new GraphToDiagramSynchronizer(graph, ctx, createElementClassProvider(graph));
 695                     initializeSynchronizationContext(graph, sync);
 696                     return sync;
 697                 }
 698             });
 699         } catch (DatabaseException e) {
 700             throw new UnsupportedOperationException("Failed to initialize data model synchronizer", e); //$NON-NLS-1$
 701         }
 702     }
 703
 704     protected void initializeSynchronizationContext(ReadGraph graph, IModifiableSynchronizationContext context) {
 705         context.set(ModelingSynchronizationHints.MODELING_RESOURCE, ModelingResources.getInstance(graph));
 706     }
 707
 708     protected IElementClassProvider createElementClassProvider(ReadGraph graph) {
 709         DiagramResource dr = DiagramResource.getInstance(graph);
 710         return ElementClassProviders.mappedProvider(
 711                 ElementClasses.CONNECTION, ConnectionClass.CLASS.newClassWith(new StaticObjectAdapter(dr.RouteGraphConnection)),
 712                 ElementClasses.FLAG, FlagClassFactory.createFlagClass(dr.Flag, dr.Flag_Terminal)
 713         );
 714     }
 715
 716     protected SimpleElementTransformHandler getTransformHandler() {
 717         return new SimpleElementTransformHandler(true, true, true);
 718     }
 719
 720     public void initializeCanvasContext(CanvasContext ctx) {
 721         IHintContext h = ctx.getDefaultHintContext();
 722
 723         // The canvas context should not be painted until it is ready to avoid
 724         // unnecessary visual glitches.
 725         h.setHint(Hints.KEY_DISABLE_PAINTING, Boolean.TRUE);
 726
 727         Object task = BEGIN("createSynchronizer"); //$NON-NLS-1$
 728         this.synchronizer = createSynchronizer(ctx, sessionContext);
 729         END(task);
 730
 731         IContextService contextService = (IContextService) getSite().getService(IContextService.class);
 732         contextUtil = new ContextUtil(contextService, swt);
 733
 734         // Support & Util Participants
 735         ctx.add(new TransformUtil());
 736         ctx.add(new MouseUtil());
 737         ctx.add(new KeyUtil());
 738         ctx.add(contextUtil);
 739         ctx.add(new WorkbenchStatusLine(statusLineManager));
 740         ctx.add(new CanvasGrab());
 741         ctx.add(new SymbolUtil());
 742         ctx.add(new TimeParticipant());
 743         ctx.add(new CanvasBoundsParticipant());
 744         ctx.add(new Notifications());
 745
 746         ctx.add(new SGFocusParticipant(c, DIAGRAMMING_CONTEXT));
 747
 748         // Debug participant(s)
 749         // ctx.add( new PointerPainter() );
 750         // ctx.add( new HandPainter() );
 751         h.setHint(PointerPainter.KEY_PAINT_POINTER, true);
 752
 753         // Pan & Zoom & Rotate
 754         addViewManipulationParticipants(ctx);
 755
 756         ctx.add(getTransformHandler());
 757         ctx.add(new ExpandSelectionHandler(getEditorSite().getActionBars().getStatusLineManager()));
 758
 759         // Key bindings
 760         addKeyBindingParticipants(ctx);
 761
 762         // Grid & Ruler & Background
 763         addGridRulerBackgroundParticipants(ctx);
 764
 765         h.setHint(Hints.KEY_DISPLAY_PAGE, diagramPreferences.get(DiagramPreferences.P_DISPLAY_PAGE_SIZE));
 766         h.setHint(Hints.KEY_DISPLAY_MARGINS, diagramPreferences.get(DiagramPreferences.P_DISPLAY_MARGINS));
 767         ctx.add(new PageBorderParticipant());
 768
 769         // h.setHint(Hints.KEY_GRID_COLOR, new Color(0.9f, 0.9f, 0.9f));
 770         // h.setHint(Hints.KEY_BACKGROUND_COLOR, Color.LIGHT_GRAY);
 771         h.setHint(Hints.KEY_GRID_COLOR, new Color(0.9f, 0.9f, 0.9f));
 772         h.setHint(Hints.KEY_BACKGROUND_COLOR, Color.WHITE);
 773         h.setHint(RulerPainter.KEY_RULER_BACKGROUND_COLOR, new Color(0.9f, 0.9f, 0.9f, 0.75f));
 774         h.setHint(RulerPainter.KEY_RULER_TEXT_COLOR, Color.BLACK);
 775
 776         ////// Diagram Participants //////
 777         addDiagramParticipants(ctx);
 778         addPainterParticipants(ctx);
 779
 780         /////// D'n'D ///////
 781         addDropParticipants(ctx);
 782
 783         h.setHint(ElementPainter.KEY_SELECTION_FRAME_COLOR, Color.MAGENTA);
 784         h.setHint(Hints.KEY_TOOL, Hints.POINTERTOOL);
 785
 786         h.setHint(PanZoomRotateHandler.KEY_ZOOM_IN_LIMIT, 100000.0);
 787         h.setHint(PanZoomRotateHandler.KEY_ZOOM_OUT_LIMIT, 10.0);
 788
 789         Double snapResolution = diagramPreferences.get(DiagramPreferences.P_SNAP_GRID_SIZE);
 790         this.snapAdvisor = new GridSnapAdvisor(snapResolution);
 791         h.setHint(DiagramHints.SNAP_ADVISOR, this.snapAdvisor);
 792         h.setHint(GridPainter.KEY_GRID_SIZE, snapResolution);
 793         h.setHint(GridPainter.KEY_GRID_ENABLED, Boolean.FALSE);
 794
 795         // Workbench selection provider
 796         addStructureParticipants(ctx);
 797
 798         // Pop-up menu
 799         addPopupmenu(ctx);
 800
 801         // Load page frame description settings
 802         loadPageSettings(ctx);
 803
 804         addOtherParticipants(ctx);
 805
 806         ctx.assertParticipantDependencies();
 807         ctx.setLocked(false);
 808     }
 809
 810     protected void addGridRulerBackgroundParticipants(CanvasContext ctx) {
 811         ctx.add(new GridPainter());
 812         ctx.add(new RulerPainter());
 813         ctx.add(new BackgroundPainter());
 814     }
 815
 816     protected void loadPageSettings(ICanvasContext ctx) {
 817         DiagramDesc diagramDesc = null;
 818
 819         // load diagram page configuration
 820         if (diagramResource != null) {
 821             try {
 822                 diagramDesc = sessionContext.getSession().syncRequest(DiagramRequests.getDiagramDesc(diagramResource));
 823             } catch (DatabaseException e) {
 824                 ErrorLogger.defaultLogError(e);
 825             }
 826         }
 827
 828         if (diagramDesc == null) {
 829             // Take page description from the preferences if nothing else is available.
 830             final DiagramDesc desc = diagramDesc = diagramPreferences.getDiagramDesc();
 831
 832             // Write page configuration to graph
 833             sessionContext.getSession().asyncRequest(new WriteRequest() {
 834                 @Override
 835                 public void perform(WriteGraph graph) throws DatabaseException {
 836                     if (graph.isImmutable(diagramResource))
 837                         return;
 838                     CommonDBUtils.selectClusterSet(graph, diagramResource);
 839                     DiagramGraphUtil.setDiagramDesc(graph, diagramResource, desc);
 840                 }
 841             }, parameter -> {
 842                 if (parameter != null)
 843                     ErrorLogger.defaultLogError("Failed to write default diagram page description to database, see exception for details", parameter); //$NON-NLS-1$
 844             });
 845         }
 846
 847         setDiagramDesc(ctx, diagramDesc);
 848
 849         // Create a listener to react to page setting changes.
 850         sessionContext.getSession().asyncRequest(DiagramRequests.getDiagramDesc(diagramResource),
 851                 new ListenerDelegate<DiagramDesc>(this) {
 852             @Override
 853             public void execute(final DiagramDesc result) {
 854                 if (result != null && canvasContext != null) {
 855                     ThreadUtils.asyncExec(canvasContext.getThreadAccess(), new Runnable() {
 856                         @Override
 857                         public void run() {
 858                             if (!disposed)
 859                                 setDiagramDesc(canvasContext, result);
 860                         }
 861                     });
 862                 }
 863             }
 864         });
 865     }
 866
 867     protected void setDiagramDesc(ICanvasContext ctx, DiagramDesc diagramDesc) {
 868         if (diagramDesc == null)
 869             throw new NullPointerException("null diagram desc"); //$NON-NLS-1$
 870
 871         if (diagramDesc.equals(this.diagramDesc))
 872             return;
 873
 874         this.diagramDesc = diagramDesc;
 875         IHintContext hints = ctx.getDefaultHintContext();
 876         hints.setHint(Hints.KEY_PAGE_DESC, diagramDesc.getPageDesc());
 877         hints.setHint(Hints.KEY_DISPLAY_PAGE, diagramDesc.isPageBordersVisible());
 878         hints.setHint(Hints.KEY_DISPLAY_MARGINS, diagramDesc.isMarginsVisible());
 879         hints.setHint(GridPainter.KEY_GRID_ENABLED, diagramDesc.isGridVisible());
 880         hints.setHint(RulerPainter.KEY_RULER_ENABLED, diagramDesc.isRulerVisible());
 881         snapAdvisor.setResolution(diagramDesc.getGridSize());
 882         hints.setHint(GridPainter.KEY_GRID_SIZE, diagramDesc.getGridSize());
 883     }
 884
 885     /**
 886      * Must be invoked from the AWT thread only.
 887      *
 888      * @param state
 889      * @param ctx
 890      */
 891     protected void applyEditorState(final EditorState state, final ICanvasContext ctx) {
 892         final IDiagram diagram = ctx.getHintStack().getHint(DiagramHints.KEY_DIAGRAM);
 893
 894         if (state.viewTransform != null && state.viewTransform.getDeterminant() != 0) {
 895             for (PanZoomRotateHandler h : ctx.getItemsByClass(PanZoomRotateHandler.class)) {
 896                 h.setTransform(state.viewTransform);
 897             }
 898         }
 899
 900         if (diagram != null) {
 901             if (state.viewTransform != null)
 902                 diagram.removeHint(DiagramHints.KEY_INITIAL_ZOOM_TO_FIT);
 903
 904             if (state.toolMode != null)
 905                 ctx.getDefaultHintContext().setHint(Hints.KEY_TOOL, state.toToolMode());
 906             else
 907                 ctx.getDefaultHintContext().setHint(Hints.KEY_TOOL, Hints.POINTERTOOL);
 908
 909             final Set<IElement> selected = DiagramEditorStates.toElements(state.selection, diagram);
 910             if (!selected.isEmpty()) {
 911                 for (Selection s : ctx.getItemsByClass(Selection.class)) {
 912                     s.setSelection(0, selected);
 913                 }
 914             }
 915         }
 916     }
 917
 918     protected EditorState getSavedEditorState(ICanvasContext ctx) {
 919         return DiagramEditorStates.toEditorState(ctx, true, true, true);
 920     }
 921
 922     protected void saveEditorState(ICanvasContext ctx) {
 923         DiagramEditorStates.saveEditorState(PREFERENCE_VIRTUAL_GRAPH, diagramResource, getSavedEditorState(ctx) , DiagramViewer.this);
 924     }
 925
 926     private boolean firstFocus = true;
 927
 928     public void setFocus() {
 929
 930         if(c != null) {
 931                 c.setFocus();
 932
 933                 if (firstFocus) {
 934                     // This is a workaround for using the symbol viewer in multi-page
 935                     // editors which causes the first zoom-to-fit scheduling to happen
 936                     // already before the controls have been laid out properly.
 937                     firstFocus = false;
 938                     firstTimeSetFocus();
 939                 }
 940
 941         }
 942
 943     }
 944
 945     protected void firstTimeSetFocus() {
 946         // [Tuukka@2010-02-11]
 947         // Removed since this is actually a workaround for multi-page editors.
 948         //scheduleZoomToFit();
 949     }
 950
 951     public void dispose() {
 952         // Deactivate all contexts here because after this the context service
 953         // in question will not be available.
 954         if (contextUtil != null) {
 955             contextUtil.deactivateAll();
 956         }
 957
 958         disposed = true;
 959
 960         if (hasDiagramSourceListener != null) {
 961             hasDiagramSourceListener.dispose();
 962             hasDiagramSourceListener = null;
 963         }
 964
 965         if (activation != null) {
 966             activation.deactivate();
 967             activation = null;
 968         }
 969
 970         if (resourceManager != null) {
 971                 resourceManager.dispose();
 972                 resourceManager = null;
 973         }
 974         //super.dispose();
 975     }
 976
 977     protected Resource getInputResource() {
 978         return getResourceInput().getResource();
 979     }
 980
 981     public IResourceEditorInput getResourceInput() {
 982         return (IResourceEditorInput) getEditorInput();
 983     }
 984
 985     public IResourceEditorInput2 getResourceInput2() {
 986         return (IResourceEditorInput2) getEditorInput();
 987     }
 988
 989     public void init(DiagramViewerHost _host, IEditorSite site, IEditorInput input, DataContainer<IDiagram> diagramContainer, WorkbenchSelectionProvider selectionProvider) {
 990         if (!(input instanceof IResourceEditorInput))
 991             throw new RuntimeException("Invalid input: must be IResourceEditorInput"); //$NON-NLS-1$
 992
 993         setHost(_host);
 994         setSite(site);
 995         setInput(input);
 996         this.sourceDiagramContainer = diagramContainer;
 997         this.selectionProvider = selectionProvider;
 998
 999         // Set initial part name according to the name given by IEditorInput
1000         host.doSetPartName(getEditorInput().getName());
1001
1002         Session session = Simantics.peekSession();
1003         if (session != null) {
1004             Supplier<Boolean> disposedCallback = () -> disposed;
1005             session.asyncRequest(
1006                     new TitleRequest(site.getId(), getResourceInput()),
1007                     new TitleUpdater(site.getShell().getDisplay(), host::doSetPartName, disposedCallback));
1008             session.asyncRequest(
1009                     new ToolTipRequest(site.getId(), getResourceInput()),
1010                     new TitleUpdater(site.getShell().getDisplay(), host::doSetTitleToolTip, disposedCallback));
1011         }
1012
1013         try {
1014             // Read previous editor state from the database
1015             editorState = DiagramEditorStates.readEditorState(getInputResource());
1016         } catch (DatabaseException e) {
1017             exception(e);
1018         }
1019     }
1020
1021     @SuppressWarnings("unchecked")
1022     @Override
1023     public <T> T getAdapter(Class<T> adapter) {
1024 //        System.out.println("diagramViewer getAdapter " + adapter);
1025         // Property view support
1026         if (adapter == IPropertyPage.class)
1027             return (T) createPropertyPage(getSite(), getPropertyPageContexts());
1028         // Provide symbols for the editor
1029         if (adapter == SymbolProviderFactory.class) {
1030             try {
1031                 return (T) DiagramTypeUtils.readSymbolProviderFactory(sessionContext.getSession(), diagramResource);
1032             } catch (DatabaseException e) {
1033                 ErrorLogger.defaultLogError(getClass() + " failed to adapt to SymbolProviderFactory, see exception for details.", e); //$NON-NLS-1$
1034                 return null;
1035             }
1036         }
1037         // Outline view support
1038         if (adapter == IContentOutlinePage.class)
1039             return (T) new DiagramOutlinePage(sessionContextProvider, getResourceInput2());
1040         // Role view support
1041         if (adapter == ILayersViewPage.class)
1042             return (T) new DiagramLayersPage(sourceDiagram, canvasContext);
1043         // Support external steering of the diagram canvas, zooming etc.
1044         if (adapter == ICanvasContext.class)
1045             return (T) canvasContext;
1046         // Support scene graph debugger view
1047         if (adapter == INode.class) {
1048             if (canvasContext != null) {
1049                 INode node = canvasContext.getCanvasNode();
1050                 if (node != null)
1051                     return (T) NodeUtil.getRootNode(node);
1052             }
1053             return null;
1054         }
1055         // Support retrieval of the current diagram.
1056         if (adapter == IDiagram.class)
1057             return (T) sourceDiagram;
1058         // Why is this here ??
1059         if (adapter == Session.class)
1060             return (T) sessionContext.getSession();
1061         if(adapter == RuntimeDiagramManager.class)
1062             return (T) runtimeDiagramManager;
1063         if (adapter == Resource.class)
1064             return (T) getRuntime();
1065         if (adapter == ICanvasChassis.class)
1066             return (T) c;
1067
1068         return null;
1069     }
1070
1071     //-------------------------------------------------------------------------
1072     // Profiling aid
1073
1074     protected static Object BEGIN(String name) {
1075         if (PROFILE) {
1076             //return ThreadLog.BEGIN(name);
1077         }
1078         return null;
1079     }
1080
1081     protected static void END(Object task) {
1082         if (PROFILE) {
1083             //((Task) task).end();
1084         }
1085     }
1086
1087     //-------------------------------------------------------------------------
1088     // implement ListenerSupport
1089
1090     @Override
1091     public void exception(Throwable t) {
1092         ErrorLogger.defaultLogError(t);
1093     }
1094
1095     @Override
1096     public boolean isDisposed() {
1097         return disposed;
1098     }
1099
1100     protected void collectGarbage() {
1101         SessionGarbageCollectorJob.getInstance().schedule(0);
1102         AWTThread.getThreadAccess().asyncExec(new Runnable() {
1103             @Override
1104             public void run() {
1105                 //System.out.println("BEFORE CLEAR: " + SVGCache.getSVGUniverse().report());
1106                 SVGCache.getSVGUniverse().clearUnreferenced();
1107                 //System.out.println("AFTER CLEAR: " + SVGCache.getSVGUniverse().report());
1108             }
1109         });
1110     }
1111
1112     //-------------------------------------------------------------------------
1113     // Listener for certain canvas context hint changes
1114
1115     IHintListener canvasHintListener = new HintListenerAdapter() {
1116         @Override
1117         public void hintChanged(IHintObservable sender, Key key, Object oldValue, Object newValue) {
1118             if (key == GridPainter.KEY_GRID_ENABLED) {
1119                 boolean v = Boolean.TRUE.equals(newValue);
1120                 if (diagramDesc.isGridVisible() != v)
1121                     setGlobalPreference(DiagramResource.URIs.DisplayGrid, v);
1122             } else if (key == RulerPainter.KEY_RULER_ENABLED) {
1123                 boolean v = Boolean.TRUE.equals(newValue);
1124                 if (diagramDesc.isRulerVisible() != v)
1125                     setGlobalPreference(DiagramResource.URIs.DisplayRuler, v);
1126             }
1127         }
1128     };
1129
1130     private <T> void setGlobalPreference(final String preferenceURI, boolean value) {
1131         TagUtil.execute(Simantics.getSession(), PREFERENCE_VIRTUAL_GRAPH, preferenceURI, value, Simantics.getProjectResource());
1132     }
1133
1134     /*
1135      * --------------------------------------------------------------------
1136      * Changes related to removal of EditorPart extension from here on down
1137      * --------------------------------------------------------------------
1138      */
1139
1140     private IWorkbenchPartSite partSite;
1141     private DiagramViewerHost host;
1142     private IEditorInput editorInput = null;
1143
1144     /* (non-Javadoc)
1145      * Method declared on IWorkbenchPart.
1146      */
1147     public IWorkbenchPartSite getSite() {
1148         return partSite;
1149     }
1150
1151     public IEditorSite getEditorSite() {
1152         return (IEditorSite) getSite();
1153     }
1154
1155     public IEditorInput getEditorInput() {
1156         return editorInput;
1157     }
1158
1159 //    protected void setPartName(String partName) {
1160 ////        if (compatibilityTitleListener != null) {
1161 ////            removePropertyListener(compatibilityTitleListener);
1162 ////            compatibilityTitleListener = null;
1163 ////        }
1164 ////
1165 ////        super.setPartName(partName);
1166 //    }
1167
1168 //    protected void setTitleToolTip(String toolTip) {
1169 ////        toolTip = Util.safeString(toolTip);
1170 ////        //Do not send changes if they are the same
1171 ////        if (Util.equals(this.toolTip, toolTip)) {
1172 ////                    return;
1173 ////            }
1174 ////        this.toolTip = toolTip;
1175 ////        firePropertyChange(IWorkbenchPart.PROP_TITLE);
1176 //    }
1177
1178     protected void setHost(DiagramViewerHost host) {
1179         this.host = host;
1180     }
1181
1182     protected void setSite(IWorkbenchPartSite site) {
1183         this.partSite = site;
1184     }
1185
1186     protected void setInput(IEditorInput input) {
1187         Assert.isLegal(input != null);
1188         editorInput = input;
1189     }
1190
1191     public Composite getComposite() {
1192         return c;
1193     }
1194
1195 }