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.ConnectionCrossingsParticipant;
  71 import org.simantics.diagram.participant.ContextUtil;
  72 import org.simantics.diagram.participant.PointerInteractor2;
  73 import org.simantics.diagram.participant.SGFocusParticipant;
  74 import org.simantics.diagram.query.DiagramRequests;
  75 import org.simantics.diagram.runtime.RuntimeDiagramManager;
  76 import org.simantics.diagram.stubs.DiagramResource;
  77 import org.simantics.diagram.symbolcontribution.SymbolProviderFactory;
  78 import org.simantics.diagram.synchronization.CopyAdvisor;
  79 import org.simantics.diagram.synchronization.IModifiableSynchronizationContext;
  80 import org.simantics.diagram.synchronization.SynchronizationHints;
  81 import org.simantics.diagram.synchronization.graph.DiagramGraphUtil;
  82 import org.simantics.diagram.ui.DiagramModelHints;
  83 import org.simantics.diagram.ui.SWTPopupMenuParticipant;
  84 import org.simantics.diagram.ui.SWTPopupMenuParticipantAwt;
  85 import org.simantics.diagram.ui.WorkbenchSelectionProvider;
  86 import org.simantics.g2d.canvas.Hints;
  87 import org.simantics.g2d.canvas.ICanvasContext;
  88 import org.simantics.g2d.canvas.ICanvasParticipant;
  89 import org.simantics.g2d.canvas.impl.CanvasContext;
  90 import org.simantics.g2d.chassis.AWTChassis;
  91 import org.simantics.g2d.chassis.ICanvasChassis;
  92 import org.simantics.g2d.chassis.IChassisListener;
  93 import org.simantics.g2d.chassis.SWTChassis;
  94 import org.simantics.g2d.connection.IConnectionAdvisor;
  95 import org.simantics.g2d.diagram.DiagramClass;
  96 import org.simantics.g2d.diagram.DiagramHints;
  97 import org.simantics.g2d.diagram.IDiagram;
  98 import org.simantics.g2d.diagram.handler.PickRequest.PickFilter;
  99 import org.simantics.g2d.diagram.impl.Diagram;
 100 import org.simantics.g2d.diagram.participant.DelayedBatchElementPainter;
 101 import org.simantics.g2d.diagram.participant.DiagramParticipant;
 102 import org.simantics.g2d.diagram.participant.ElementInteractor;
 103 import org.simantics.g2d.diagram.participant.ElementPainter;
 104 import org.simantics.g2d.diagram.participant.Selection;
 105 import org.simantics.g2d.diagram.participant.TerminalPainter;
 106 import org.simantics.g2d.diagram.participant.ZOrderHandler;
 107 import org.simantics.g2d.diagram.participant.pointertool.PointerInteractor;
 108 import org.simantics.g2d.element.ElementClassProviders;
 109 import org.simantics.g2d.element.ElementClasses;
 110 import org.simantics.g2d.element.ElementUtils;
 111 import org.simantics.g2d.element.IElement;
 112 import org.simantics.g2d.element.IElementClassProvider;
 113 import org.simantics.g2d.element.handler.impl.StaticObjectAdapter;
 114 import org.simantics.g2d.elementclass.connection.ConnectionClass;
 115 import org.simantics.g2d.page.DiagramDesc;
 116 import org.simantics.g2d.participant.BackgroundPainter;
 117 import org.simantics.g2d.participant.CanvasBoundsParticipant;
 118 import org.simantics.g2d.participant.CanvasGrab;
 119 import org.simantics.g2d.participant.GridPainter;
 120 import org.simantics.g2d.participant.KeyUtil;
 121 import org.simantics.g2d.participant.MouseUtil;
 122 import org.simantics.g2d.participant.Notifications;
 123 import org.simantics.g2d.participant.PageBorderParticipant;
 124 import org.simantics.g2d.participant.PanZoomRotateHandler;
 125 import org.simantics.g2d.participant.PointerPainter;
 126 import org.simantics.g2d.participant.RenderingQualityInteractor;
 127 import org.simantics.g2d.participant.RulerPainter;
 128 import org.simantics.g2d.participant.SymbolUtil;
 129 import org.simantics.g2d.participant.TimeParticipant;
 130 import org.simantics.g2d.participant.TransformUtil;
 131 import org.simantics.g2d.participant.WorkbenchStatusLine;
 132 import org.simantics.g2d.participant.ZoomToAreaHandler;
 133 import org.simantics.g2d.tooltip.TerminalTooltipParticipant;
 134 import org.simantics.g2d.utils.CanvasUtils;
 135 import org.simantics.layer0.utils.triggers.IActivation;
 136 import org.simantics.layer0.utils.triggers.IActivationManager;
 137 import org.simantics.modeling.ModelingResources;
 138 import org.simantics.modeling.mapping.ComponentCopyAdvisor;
 139 import org.simantics.modeling.mapping.ElementCopyAdvisor;
 140 import org.simantics.modeling.mapping.MappedElementCopyAdvisor;
 141 import org.simantics.modeling.mapping.ModelingSynchronizationHints;
 142 import org.simantics.modeling.ui.diagramEditor.handlers.LinkBrowsingHandler;
 143 import org.simantics.modeling.ui.diagramEditor.handlers.StructuralBrowsingHandler;
 144 import org.simantics.modeling.ui.preferences.DiagramPreferenceUtil;
 145 import org.simantics.modeling.ui.preferences.DiagramPreferences;
 146 import org.simantics.project.ontology.ProjectResource;
 147 import org.simantics.scenegraph.INode;
 148 import org.simantics.scenegraph.g2d.snap.GridSnapAdvisor;
 149 import org.simantics.scenegraph.utils.NodeUtil;
 150 import org.simantics.selectionview.StandardPropertyPage;
 151 import org.simantics.structural.stubs.StructuralResource2;
 152 import org.simantics.structural2.modelingRules.IModelingRules;
 153 import org.simantics.ui.SimanticsUI;
 154 import org.simantics.ui.jobs.SessionGarbageCollectorJob;
 155 import org.simantics.ui.workbench.IPropertyPage;
 156 import org.simantics.ui.workbench.IResourceEditorInput;
 157 import org.simantics.ui.workbench.IResourceEditorInput2;
 158 import org.simantics.ui.workbench.TitleRequest;
 159 import org.simantics.ui.workbench.TitleUpdater;
 160 import org.simantics.ui.workbench.ToolTipRequest;
 161 import org.simantics.ui.workbench.editor.input.InputValidationCombinators;
 162 import org.simantics.utils.DataContainer;
 163 import org.simantics.utils.datastructures.hints.HintContext;
 164 import org.simantics.utils.datastructures.hints.HintListenerAdapter;
 165 import org.simantics.utils.datastructures.hints.IHintContext;
 166 import org.simantics.utils.datastructures.hints.IHintContext.Key;
 167 import org.simantics.utils.datastructures.hints.IHintListener;
 168 import org.simantics.utils.datastructures.hints.IHintObservable;
 169 import org.simantics.utils.threads.AWTThread;
 170 import org.simantics.utils.threads.IThreadWorkQueue;
 171 import org.simantics.utils.threads.SWTThread;
 172 import org.simantics.utils.threads.ThreadUtils;
 173 import org.simantics.utils.ui.ErrorLogger;
 174 import org.simantics.utils.ui.ExceptionUtils;
 175
 176 import com.kitfox.svg.SVGCache;
 177
 178 /**
 179  * @author Toni Kalajainen
 180  * @author Tuukka Lehtonen
 181  */
 182 public class DiagramViewer
 183   //extends EditorPart implements IResourceEditorPart2,
 184     implements ListenerSupport, IAdaptable {
 185
 186     public interface DiagramViewerHost {
 187         void doSetPartName(String name);
 188         void doSetTitleToolTip(String name);
 189     }
 190
 191     public static final String                      DIAGRAMMING_CONTEXT      = "org.simantics.modeling.ui.diagramming"; //$NON-NLS-1$
 192     private static final String                     PREFERENCE_VIRTUAL_GRAPH = "preferences"; //$NON-NLS-1$
 193
 194     private static final boolean                    PROFILE                  = false;
 195
 196     ParametrizedRead<IResourceEditorInput, Boolean> INPUT_VALIDATOR =
 197         Combinators.compose(
 198                 InputValidationCombinators.or(
 199                         // Normal configuration diagrams of a model
 200                         Combinators.compose(
 201                                 InputValidationCombinators.hasURI(),
 202                                 InputValidationCombinators.partialFunction(ModelingResources.URIs.DiagramToComposite)
 203                         ),
 204                         // Configuration diagrams of a component type
 205                         Combinators.compose(
 206                                 InputValidationCombinators.hasURI(),
 207                                 Combinators.compose(
 208                                         InputValidationCombinators.partialFunction(StructuralResource2.URIs.Defines),
 209                                         InputValidationCombinators.partialFunction(ModelingResources.URIs.DiagramToComposite)
 210                                 )
 211                         )
 212                 ),
 213                 InputValidationCombinators.extractInputResource()
 214         );
 215
 216     protected EditorState                editorState;
 217
 218     protected boolean                    disposed           = false;
 219     protected IThreadWorkQueue           swt;
 220     protected IStatusLineManager         statusLineManager;
 221     protected Display                    display;
 222     protected LocalResourceManager       resourceManager;
 223     protected SWTChassis                 c;
 224     protected IDiagram                   sourceDiagram;
 225     protected DataContainer<IDiagram>    sourceDiagramContainer;
 226     protected CanvasContext              canvasContext;
 227     protected ISessionContextProvider    sessionContextProvider;
 228     protected ISessionContext            sessionContext;
 229     protected Resource                   diagramResource;
 230     protected GraphToDiagramSynchronizer synchronizer;
 231     protected IActivation                activation;
 232     protected ContextUtil                contextUtil;
 233     protected SWTPopupMenuParticipant    popupMenuParticipant;
 234
 235     protected DiagramPreferences         diagramPreferences;
 236     protected DiagramDesc                diagramDesc;
 237     protected GridSnapAdvisor            snapAdvisor;
 238
 239     private RuntimeDiagramManager        runtimeDiagramManager;
 240     private Resource                     runtimeDiagramResourceCache;
 241     private HasDiagramSourceListener     hasDiagramSourceListener;
 242
 243     /**
 244      * Set externally in
 245      * {@link #init(DiagramViewerHost, IEditorSite, IEditorInput, DataContainer, WorkbenchSelectionProvider)}
 246      * .
 247      */
 248     protected WorkbenchSelectionProvider selectionProvider;
 249
 250     protected Resource getRuntimeFromManager() {
 251         RuntimeDiagramManager rtdm = runtimeDiagramManager;
 252         return (rtdm == null) ? null : rtdm.getRuntimeDiagram();
 253     }
 254
 255     public Resource getRuntime() {
 256         if (runtimeDiagramResourceCache != null)
 257             return runtimeDiagramResourceCache;
 258         runtimeDiagramResourceCache = getRuntimeFromManager();
 259         return runtimeDiagramResourceCache;
 260     }
 261
 262     public ParametrizedRead<IResourceEditorInput, Boolean> getInputValidator() {
 263         return INPUT_VALIDATOR;
 264     }
 265
 266     protected void addDropParticipants(ICanvasContext ctx) {
 267         ctx.getDefaultHintContext().setHint(Hints.KEY_ALLOWED_DRAG_ACTIONS, DnDConstants.ACTION_COPY);
 268
 269         ctx.add(new PopulateElementDropParticipant(synchronizer, getSite()));
 270         ctx.add(new PopulateElementMonitorDropParticipant(synchronizer, 0.5, 0.5));
 271     }
 272
 273     protected CopyPasteStrategy getCopyPasteStrategy() {
 274                 try {
 275                         CopyPasteStrategy cpStrategy = Simantics.getSession().syncRequest(new PossibleAdapter<CopyPasteStrategy>(getInputResource(), CopyPasteStrategy.class));
 276                         if(cpStrategy != null) return cpStrategy;
 277                 } catch (DatabaseException e) {
 278                 }
 279                 return getDefaultCopyPasteStrategy();
 280     }
 281
 282     protected CopyPasteStrategy getDefaultCopyPasteStrategy() {
 283         return new DefaultCopyPasteStrategy();
 284     }
 285
 286     protected CopyAdvisor getCopyAdvisor() {
 287                 try {
 288                         CopyAdvisor advisor = Simantics.getSession().syncRequest(new PossibleAdapter<CopyAdvisor>(getInputResource(), CopyAdvisor.class));
 289                         if(advisor != null) return advisor;
 290                 } catch (DatabaseException e) {
 291                 }
 292                 return new MappedElementCopyAdvisor(new ElementCopyAdvisor(), new ComponentCopyAdvisor());
 293     }
 294
 295     /**
 296      * @param ctx
 297      * TODO: change argument from CanvasContext to ICanvasContext
 298      */
 299     protected void addKeyBindingParticipants(CanvasContext ctx) {
 300         //ctx.add( new KeyToCommand( CommandKeyBinding.DEFAULT_BINDINGS ) );
 301         ctx.add(new DeleteHandler(statusLineManager));
 302         ctx.add(new CopyPasteHandler(getCopyPasteStrategy(), statusLineManager).setWorkbenchSite(getEditorSite()));
 303         ctx.add(new ConnectionCommandHandler());
 304     }
 305
 306     protected void addPopupmenu(ICanvasContext ctx) {
 307         ctx.add(popupMenuParticipant);
 308     }
 309
 310     protected void addWorkbenchSelectionProvider(ICanvasContext ctx) {
 311         if (selectionProvider != null)
 312             ctx.add(selectionProvider);
 313     }
 314
 315     protected void addViewManipulationParticipants(CanvasContext ctx) {
 316         ctx.add(new PanZoomRotateHandler());
 317         //ctx.add(new MousePanZoomInteractor());
 318         //ctx.add(new MultitouchPanZoomRotateInteractor());
 319         // ctx.add( new OrientationRestorer() );
 320         ctx.add(new ZoomToAreaHandler());
 321     }
 322
 323     protected void addDiagramParticipants(ICanvasContext ctx) {
 324         ctx.add(new ZOrderHandler());
 325         ctx.add(getPointerInteractor());
 326         ctx.add(new ElementInteractor());
 327         ctx.add(new Selection());
 328         ctx.add(new DiagramParticipant());
 329         ctx.add(new ElementPainter());
 330         //ctx.add(new ElementHeartbeater());
 331         //ctx.add(new ZoomTransitionParticipant(TransitionFunction.SIGMOID));
 332         //ctx.add(new TooltipParticipant());
 333         ctx.add(new TerminalTooltipParticipant());
 334         ctx.add(new ConnectionCrossingsParticipant(getInputResource()));
 335     }
 336
 337     protected void addPainterParticipants(ICanvasContext ctx) {
 338         ctx.add(new RenderingQualityInteractor());
 339         ctx.add(new TerminalPainter(true, true, false, true));
 340         ctx.add(new DelayedBatchElementPainter(PickFilter.FILTER_MONITORS, 500, TimeUnit.MILLISECONDS));
 341     }
 342
 343     protected void addStructureParticipants(ICanvasContext ctx) {
 344         addWorkbenchSelectionProvider(ctx);
 345         // Add visual browsing capabilities for structural models
 346         ctx.add(new StructuralBrowsingHandler(getSite(), sessionContext, getResourceInput2()));
 347         ctx.add(new LinkBrowsingHandler(getSite(), this, sessionContext));
 348     }
 349
 350     /**
 351      * Override to add any diagram/canvas participants to the canvas context
 352      * initialized for the editor.
 353      *
 354      * @param ctx
 355      */
 356     protected void addOtherParticipants(CanvasContext ctx) {
 357     }
 358
 359     public static Set<String> defaultPropertyBrowseContexts = Collections.singleton(ProjectResource.URIs.ProjectBrowseContext);
 360
 361     protected Set<String> getPropertyPageContexts() {
 362         try {
 363             return BrowseContext.getBrowseContextClosure(Simantics.getSession(), defaultPropertyBrowseContexts);
 364         } catch (DatabaseException e) {
 365             ExceptionUtils.logAndShowError(Messages.DiagramViewer_FailedtoLoadModeled, e);
 366             return defaultPropertyBrowseContexts;
 367         }
 368     }
 369
 370     protected IPropertyPage createPropertyPage(IWorkbenchPartSite site, Set<String> contexts) {
 371         return new StandardPropertyPage(site, contexts);
 372     }
 373
 374     protected String getPopupId() {
 375         return "#ModelingDiagramPopup"; //$NON-NLS-1$
 376     }
 377
 378     protected void getPreferences() {
 379         this.diagramPreferences = DiagramPreferenceUtil.getPreferences();
 380     }
 381
 382     protected void initSession() {
 383         sessionContextProvider = Simantics.getSessionContextProvider();
 384         sessionContext = sessionContextProvider.getSessionContext();
 385     }
 386
 387     protected void readNames() {
 388         String name = getEditorInput().getName();
 389         host.doSetPartName(name);
 390         host.doSetTitleToolTip(name);
 391     }
 392
 393     class ChassisListener implements IChassisListener {
 394         @Override
 395         public void chassisClosed(ICanvasChassis sender) {
 396             // Prevent deadlock while disposing which using syncExec would result in.
 397             final ICanvasContext ctx = canvasContext;
 398             ThreadUtils.asyncExec(ctx.getThreadAccess(), new Runnable() {
 399                 @Override
 400                 public void run() {
 401                     if (ctx != null) {
 402                         saveEditorState(ctx);
 403                         ctx.getHintStack().removeKeyHintListener(GridPainter.KEY_GRID_ENABLED, canvasHintListener);
 404                         ctx.getHintStack().removeKeyHintListener(RulerPainter.KEY_RULER_ENABLED, canvasHintListener);
 405                         final AWTChassis awtChassis = c.getAWTComponent();
 406                         if (awtChassis != null)
 407                             awtChassis.setCanvasContext(null);
 408                         ctx.dispose();
 409                     }
 410
 411                     if (sourceDiagramContainer != null) {
 412                         sourceDiagramContainer.set(null);
 413                         sourceDiagramContainer = null;
 414                     }
 415
 416                     if (sourceDiagram != null)
 417                         sourceDiagram.dispose();
 418
 419                     if(synchronizer != null) {
 420                         synchronizer.dispose();
 421                         // Let GC work.
 422                         synchronizer = null;
 423                     }
 424
 425                     if (runtimeDiagramManager != null) {
 426                         runtimeDiagramManager.dispose();
 427                         runtimeDiagramManager = null;
 428                     }
 429                 }
 430             });
 431             c.removeChassisListener(ChassisListener.this);
 432         }
 433     }
 434
 435     protected void createChassis(Composite parent) {
 436         resourceManager = new LocalResourceManager(JFaceResources.getResources(), parent);
 437         c = new SWTChassis(parent, 0);
 438
 439         Object task = BEGIN("DV.precreateParticipants"); //$NON-NLS-1$
 440         createCustomParticipants();
 441         END(task);
 442
 443         c.populate(component -> {
 444             if (!disposed) {
 445                 c.addChassisListener(new ChassisListener());
 446                 initializeCanvas();
 447             }
 448         });
 449     }
 450
 451     protected void beforeSetCanvasContext(ICanvasContext canvasContext2) {
 452     }
 453
 454     /**
 455      * Invoke this only from the AWT thread.
 456      * @param context
 457      */
 458     protected void setCanvasContext(ICanvasContext context) {
 459         // Cannot directly invoke SWTChassis.setCanvasContext only because it
 460         // needs to be invoked in the SWT thread and AWTChassis.setCanvasContext in the
 461         // AWT thread, but directly invoking SWTChassis.setCanvasContext would call both
 462         // in the SWT thread which would cause synchronous scheduling of AWT
 463         // runnables which is always a potential source of deadlocks.
 464         c.getAWTComponent().setCanvasContext(canvasContext);
 465         swt.asyncExec(new Runnable() {
 466             @Override
 467             public void run() {
 468                 if (!c.isDisposed())
 469                     // For AWT, this is a no-operation.
 470                     c.setCanvasContext(canvasContext);
 471             }
 472         });
 473     }
 474
 475     public void createPartControl(Composite parent) {
 476         //ProfileObserver.begin = System.nanoTime();
 477         display = parent.getDisplay();
 478         swt = SWTThread.getThreadAccess(display);
 479         statusLineManager = getEditorSite().getActionBars().getStatusLineManager();
 480
 481         Object task = BEGIN("DV.initSession"); //$NON-NLS-1$
 482         initSession();
 483         END(task);
 484
 485         diagramResource = getInputResource();
 486         readNames();
 487         getPreferences();
 488
 489         try {
 490             this.runtimeDiagramManager = RuntimeDiagramManager.track(sessionContext.getSession(), diagramResource, getEditorInput(), this);
 491
 492             // Create the canvas context here before finishing createPartControl
 493             // to give DiagramViewerActionContributor a chance to work.
 494             // The context can be created in SWT thread without scheduling
 495             // to the context thread and having potential deadlocks.
 496             IThreadWorkQueue thread = AWTThread.getThreadAccess();
 497             this.canvasContext = new CanvasContext(thread);
 498             this.canvasContext.setLocked(true);
 499
 500             task = BEGIN("DV.createChassis"); //$NON-NLS-1$
 501             createChassis(parent);
 502             END(task);
 503         } catch (DatabaseException e) {
 504             ErrorLogger.defaultLogError(e);
 505         }
 506     }
 507
 508
 509         /**
 510      * A method invoked before chassis construction for creating such
 511      * {@link ICanvasParticipant}s that need to be constructed in the SWT
 512      * thread.
 513      *
 514      * Use it for creating any such canvas participants during the viewer
 515      * construction and add them to the {@link ICanvasContext} later on from
 516      * the AWT thread.
 517      */
 518     protected void createCustomParticipants() {
 519         if (SimanticsUI.isLinuxGTK()) {
 520                 popupMenuParticipant = new SWTPopupMenuParticipantAwt(getSite(), c, display, getPopupId());
 521         } else {
 522                 popupMenuParticipant = new SWTPopupMenuParticipant(getSite(), c, display, getPopupId());
 523         }
 524     }
 525
 526     /**
 527      * Invoke this only from the AWT thread.
 528      */
 529     protected void initializeCanvas() {
 530         Object canvasInit = BEGIN("DV.canvasInitialization"); //$NON-NLS-1$
 531
 532         Object task = BEGIN("DV.createViewerCanvas"); //$NON-NLS-1$
 533         initializeCanvasContext(canvasContext);
 534         END(task);
 535
 536         beforeSetCanvasContext(canvasContext);
 537         //FullscreenUtils.addFullScreenHandler(canvasContext, s, canvasProvider);
 538
 539         // Without this all diagram participants will crash like there's no tomorrow.
 540         // Just trying to keep the behavior a bit more sane in case of
 541         // errors instead of flooding the console with exceptions.
 542         canvasContext.getDefaultHintContext().setHint(DiagramHints.KEY_DIAGRAM, Diagram.spawnNew(DiagramClass.DEFAULT));
 543
 544         // Changes in ruler/grid activity shall be written as
 545         // workspace-persistent diagram-specific preferences.
 546         canvasContext.getHintStack().addKeyHintListener(GridPainter.KEY_GRID_ENABLED, canvasHintListener);
 547         canvasContext.getHintStack().addKeyHintListener(RulerPainter.KEY_RULER_ENABLED, canvasHintListener);
 548
 549         task = BEGIN("DV.setCanvasContext"); //$NON-NLS-1$
 550         setCanvasContext(canvasContext);
 551         END(task);
 552
 553         // Finish loading in a worker thread because it may be a time consuming
 554         // process to load a large diagram and we don't want unnecessary AWT
 555         // thread contention.
 556         Job loadJob = new DiagramViewerLoadJob(this);
 557         loadJob.schedule();
 558
 559         END(canvasInit);
 560     }
 561
 562     protected void activateUiContexts(ContextUtil util) {
 563         util.activate(DIAGRAMMING_CONTEXT);
 564     }
 565
 566     /**
 567      * @param monitor the progress monitor to use for reporting progress to the
 568      *        user. It is the caller's responsibility to call done() on the
 569      *        given monitor. Accepts <code>null</code>, indicating that no
 570      *        progress should be reported and that the operation cannot be
 571      *        cancelled.
 572      */
 573     protected void performActivation(IProgressMonitor monitor) {
 574         SubMonitor progress = SubMonitor.convert(monitor, Messages.DiagramViewer_MonitorActivateMapping, 100);
 575         IActivationManager activationManager = sessionContext.getSession().peekService(IActivationManager.class);
 576         if (activationManager != null) {
 577             activation = activationManager.activate(diagramResource);
 578         }
 579         progress.worked(100);
 580     }
 581
 582     protected void onCreated() {
 583     }
 584
 585     /**
 586      * @param diagram
 587      */
 588     protected void scheduleZoomToFit(IDiagram diagram) {
 589         if (diagram == null)
 590             throw new IllegalStateException("diagram is null"); //$NON-NLS-1$
 591
 592         CanvasUtils.scheduleZoomToFit(swt, () -> disposed, canvasContext, diagram);
 593     }
 594
 595     /**
 596      * Subclasses may override but should always invoke super.
 597      *
 598      * @param diagram
 599      * @param initialHints
 600      * @throws DatabaseException
 601      */
 602     protected void fillInitialDiagramHints(Resource diagram, IHintContext initialHints) throws DatabaseException {
 603         IModelingRules modelingRules = sessionContext.getSession().syncRequest(
 604                 DiagramRequests.getModelingRules(diagram, null));
 605         if (modelingRules != null) {
 606             initialHints.setHint(DiagramModelHints.KEY_MODELING_RULES, modelingRules);
 607             initialHints.setHint(DiagramHints.CONNECTION_ADVISOR,
 608                     getConnectionAdvisor(modelingRules, sessionContext.getSession()));
 609         }
 610
 611         initialHints.setHint(SynchronizationHints.COPY_ADVISOR, getCopyAdvisor());
 612         initialHints.setHint(DiagramHints.KEY_USE_CONNECTION_FLAGS, Boolean.TRUE);
 613         initialHints.setHint(DiagramHints.KEY_ALLOW_CONNECTION_BRANCHING, Boolean.TRUE);
 614         initialHints.setHint(DiagramHints.KEY_ALLOW_ROUTE_POINTS, Boolean.TRUE);
 615     }
 616
 617     /**
 618      * @param monitor the progress monitor to use for reporting progress to the
 619      *        user. It is the caller's responsibility to call done() on the
 620      *        given monitor. Accepts <code>null</code>, indicating that no
 621      *        progress should be reported and that the operation cannot be
 622      *        cancelled.
 623      * @param r
 624      * @return
 625      * @throws DatabaseException
 626      */
 627     protected IDiagram loadDiagram(IProgressMonitor monitor, final Resource r) throws DatabaseException {
 628         // Pre-load modeling rules and possibly other hints too since they are
 629         // needed already while loading the diagram contents.
 630         IHintContext initialHints = new HintContext();
 631         fillInitialDiagramHints(r, initialHints);
 632         IDiagram d = loadDiagram(monitor, r, initialHints);
 633         return d;
 634     }
 635
 636     /**
 637      * @param monitor the progress monitor to use for reporting progress to the
 638      *        user. It is the caller's responsibility to call done() on the
 639      *        given monitor. Accepts <code>null</code>, indicating that no
 640      *        progress should be reported and that the operation cannot be
 641      *        cancelled.
 642      * @param diagram
 643      * @param initialHints
 644      * @return
 645      * @throws DatabaseException
 646      */
 647     protected IDiagram loadDiagram(IProgressMonitor monitor, Resource diagram, IHintContext initialHints) throws DatabaseException {
 648         RuntimeDiagramManager rtdm = runtimeDiagramManager;
 649         Resource runtimeDiagram = rtdm != null ? rtdm.getRuntimeDiagram() : null;
 650         IDiagramLoader loader = synchronizer;
 651         if (rtdm == null || runtimeDiagram == null || loader == null)
 652             return null;
 653         IDiagram d = sessionContext.getSession().syncRequest((Read<IDiagram>) graph -> {
 654             IDiagram result = DiagramRequests.loadDiagram(monitor, getResourceInput2().getModel(null), diagram,
 655                     runtimeDiagram, null, loader, initialHints).perform(graph);
 656
 657             // #399: Enable certain PropertyTester implementation without database transactions
 658             ModelingResources MOD = ModelingResources.getInstance(graph);
 659             Resource composite = graph.getPossibleObject(diagram, MOD.DiagramToComposite);
 660             result.setHint(
 661                     DiagramModelHints.KEY_DIAGRAM_RESOURCE_TYPE_URIS,
 662                     graph.syncRequest(new TypeURIs(diagram)));
 663             result.setHint(
 664                     DiagramModelHints.KEY_MAPPED_COMPOSITE_RESOURCE_TYPE_URIS,
 665                     composite != null ? graph.syncRequest(new TypeURIs(composite)) : Collections.emptySet());
 666
 667             Resource diagramSource = graph.syncRequest(
 668                     new PossibleObject(diagram, MOD.HasDiagramSource),
 669                     hasDiagramSourceListener = new HasDiagramSourceListener(sourceDiagramContainer));
 670             ElementUtils.setOrRemoveHint(
 671                     result,
 672                     DiagramModelHints.KEY_HAS_DIAGRAM_SOURCE,
 673                     diagramSource);
 674
 675             return result;
 676         });
 677         return d;
 678     }
 679
 680     protected void beforeSetDiagram(IDiagram diagram) {
 681     }
 682
 683     protected PointerInteractor getPointerInteractor() {
 684         return new PointerInteractor2(true, true, true, false, true, false, synchronizer.getElementClassProvider());
 685     }
 686
 687     protected IConnectionAdvisor getConnectionAdvisor(IModelingRules modelingRules, Session session) {
 688         return new ModelledConnectionAdvisor(modelingRules, sessionContext.getSession());
 689     }
 690
 691     protected GraphToDiagramSynchronizer createSynchronizer(final ICanvasContext ctx, final ISessionContext sessionContext) {
 692         try {
 693             return sessionContext.getSession().syncRequest(new Read<GraphToDiagramSynchronizer>() {
 694                 @Override
 695                 public GraphToDiagramSynchronizer perform(ReadGraph graph) throws DatabaseException {
 696                     GraphToDiagramSynchronizer sync = new GraphToDiagramSynchronizer(graph, ctx, createElementClassProvider(graph));
 697                     initializeSynchronizationContext(graph, sync);
 698                     return sync;
 699                 }
 700             });
 701         } catch (DatabaseException e) {
 702             throw new UnsupportedOperationException("Failed to initialize data model synchronizer", e); //$NON-NLS-1$
 703         }
 704     }
 705
 706     protected void initializeSynchronizationContext(ReadGraph graph, IModifiableSynchronizationContext context) {
 707         context.set(ModelingSynchronizationHints.MODELING_RESOURCE, ModelingResources.getInstance(graph));
 708     }
 709
 710     protected IElementClassProvider createElementClassProvider(ReadGraph graph) {
 711         DiagramResource dr = DiagramResource.getInstance(graph);
 712         return ElementClassProviders.mappedProvider(
 713                 ElementClasses.CONNECTION, ConnectionClass.CLASS.newClassWith(new StaticObjectAdapter(dr.RouteGraphConnection)),
 714                 ElementClasses.FLAG, FlagClassFactory.createFlagClass(dr.Flag, dr.Flag_Terminal)
 715         );
 716     }
 717
 718     protected SimpleElementTransformHandler getTransformHandler() {
 719         return new SimpleElementTransformHandler(true, true, true);
 720     }
 721
 722     public void initializeCanvasContext(CanvasContext ctx) {
 723         IHintContext h = ctx.getDefaultHintContext();
 724
 725         // The canvas context should not be painted until it is ready to avoid
 726         // unnecessary visual glitches.
 727         h.setHint(Hints.KEY_DISABLE_PAINTING, Boolean.TRUE);
 728
 729         Object task = BEGIN("createSynchronizer"); //$NON-NLS-1$
 730         this.synchronizer = createSynchronizer(ctx, sessionContext);
 731         END(task);
 732
 733         IContextService contextService = (IContextService) getSite().getService(IContextService.class);
 734         contextUtil = new ContextUtil(contextService, swt);
 735
 736         // Support & Util Participants
 737         ctx.add(new TransformUtil());
 738         ctx.add(new MouseUtil());
 739         ctx.add(new KeyUtil());
 740         ctx.add(contextUtil);
 741         ctx.add(new WorkbenchStatusLine(statusLineManager));
 742         ctx.add(new CanvasGrab());
 743         ctx.add(new SymbolUtil());
 744         ctx.add(new TimeParticipant());
 745         ctx.add(new CanvasBoundsParticipant());
 746         ctx.add(new Notifications());
 747
 748         ctx.add(new SGFocusParticipant(c, DIAGRAMMING_CONTEXT));
 749
 750         // Debug participant(s)
 751         // ctx.add( new PointerPainter() );
 752         // ctx.add( new HandPainter() );
 753         h.setHint(PointerPainter.KEY_PAINT_POINTER, true);
 754
 755         // Pan & Zoom & Rotate
 756         addViewManipulationParticipants(ctx);
 757
 758         ctx.add(getTransformHandler());
 759         ctx.add(new ExpandSelectionHandler(getEditorSite().getActionBars().getStatusLineManager()));
 760
 761         // Key bindings
 762         addKeyBindingParticipants(ctx);
 763
 764         // Grid & Ruler & Background
 765         addGridRulerBackgroundParticipants(ctx);
 766
 767         h.setHint(Hints.KEY_DISPLAY_PAGE, diagramPreferences.get(DiagramPreferences.P_DISPLAY_PAGE_SIZE));
 768         h.setHint(Hints.KEY_DISPLAY_MARGINS, diagramPreferences.get(DiagramPreferences.P_DISPLAY_MARGINS));
 769         ctx.add(new PageBorderParticipant());
 770
 771         // h.setHint(Hints.KEY_GRID_COLOR, new Color(0.9f, 0.9f, 0.9f));
 772         // h.setHint(Hints.KEY_BACKGROUND_COLOR, Color.LIGHT_GRAY);
 773         h.setHint(Hints.KEY_GRID_COLOR, new Color(0.9f, 0.9f, 0.9f));
 774         h.setHint(Hints.KEY_BACKGROUND_COLOR, Color.WHITE);
 775         h.setHint(RulerPainter.KEY_RULER_BACKGROUND_COLOR, new Color(0.9f, 0.9f, 0.9f, 0.75f));
 776         h.setHint(RulerPainter.KEY_RULER_TEXT_COLOR, Color.BLACK);
 777
 778         ////// Diagram Participants //////
 779         addDiagramParticipants(ctx);
 780         addPainterParticipants(ctx);
 781
 782         /////// D'n'D ///////
 783         addDropParticipants(ctx);
 784
 785         h.setHint(ElementPainter.KEY_SELECTION_FRAME_COLOR, Color.MAGENTA);
 786         h.setHint(Hints.KEY_TOOL, Hints.POINTERTOOL);
 787
 788         h.setHint(PanZoomRotateHandler.KEY_ZOOM_IN_LIMIT, 100000.0);
 789         h.setHint(PanZoomRotateHandler.KEY_ZOOM_OUT_LIMIT, 10.0);
 790
 791         Double snapResolution = diagramPreferences.get(DiagramPreferences.P_SNAP_GRID_SIZE);
 792         this.snapAdvisor = new GridSnapAdvisor(snapResolution);
 793         h.setHint(DiagramHints.SNAP_ADVISOR, this.snapAdvisor);
 794         h.setHint(GridPainter.KEY_GRID_SIZE, snapResolution);
 795         h.setHint(GridPainter.KEY_GRID_ENABLED, Boolean.FALSE);
 796
 797         // Workbench selection provider
 798         addStructureParticipants(ctx);
 799
 800         // Pop-up menu
 801         addPopupmenu(ctx);
 802
 803         // Load page frame description settings
 804         loadPageSettings(ctx);
 805
 806         addOtherParticipants(ctx);
 807
 808         ctx.assertParticipantDependencies();
 809         ctx.setLocked(false);
 810     }
 811
 812     protected void addGridRulerBackgroundParticipants(CanvasContext ctx) {
 813         ctx.add(new GridPainter());
 814         ctx.add(new RulerPainter());
 815         ctx.add(new BackgroundPainter());
 816     }
 817
 818     protected void loadPageSettings(ICanvasContext ctx) {
 819         DiagramDesc diagramDesc = null;
 820
 821         // load diagram page configuration
 822         if (diagramResource != null) {
 823             try {
 824                 diagramDesc = sessionContext.getSession().syncRequest(DiagramRequests.getDiagramDesc(diagramResource));
 825             } catch (DatabaseException e) {
 826                 ErrorLogger.defaultLogError(e);
 827             }
 828         }
 829
 830         if (diagramDesc == null) {
 831             // Take page description from the preferences if nothing else is available.
 832             final DiagramDesc desc = diagramDesc = diagramPreferences.getDiagramDesc();
 833
 834             // Write page configuration to graph
 835             sessionContext.getSession().asyncRequest(new WriteRequest() {
 836                 @Override
 837                 public void perform(WriteGraph graph) throws DatabaseException {
 838                     if (graph.isImmutable(diagramResource))
 839                         return;
 840                     CommonDBUtils.selectClusterSet(graph, diagramResource);
 841                     DiagramGraphUtil.setDiagramDesc(graph, diagramResource, desc);
 842                 }
 843             }, parameter -> {
 844                 if (parameter != null)
 845                     ErrorLogger.defaultLogError("Failed to write default diagram page description to database, see exception for details", parameter); //$NON-NLS-1$
 846             });
 847         }
 848
 849         setDiagramDesc(ctx, diagramDesc);
 850
 851         // Create a listener to react to page setting changes.
 852         sessionContext.getSession().asyncRequest(DiagramRequests.getDiagramDesc(diagramResource),
 853                 new ListenerDelegate<DiagramDesc>(this) {
 854             @Override
 855             public void execute(final DiagramDesc result) {
 856                 if (result != null && canvasContext != null) {
 857                     ThreadUtils.asyncExec(canvasContext.getThreadAccess(), new Runnable() {
 858                         @Override
 859                         public void run() {
 860                             if (!disposed)
 861                                 setDiagramDesc(canvasContext, result);
 862                         }
 863                     });
 864                 }
 865             }
 866         });
 867     }
 868
 869     protected void setDiagramDesc(ICanvasContext ctx, DiagramDesc diagramDesc) {
 870         if (diagramDesc == null)
 871             throw new NullPointerException("null diagram desc"); //$NON-NLS-1$
 872
 873         if (diagramDesc.equals(this.diagramDesc))
 874             return;
 875
 876         this.diagramDesc = diagramDesc;
 877         IHintContext hints = ctx.getDefaultHintContext();
 878         hints.setHint(Hints.KEY_PAGE_DESC, diagramDesc.getPageDesc());
 879         hints.setHint(Hints.KEY_DISPLAY_PAGE, diagramDesc.isPageBordersVisible());
 880         hints.setHint(Hints.KEY_DISPLAY_MARGINS, diagramDesc.isMarginsVisible());
 881         hints.setHint(GridPainter.KEY_GRID_ENABLED, diagramDesc.isGridVisible());
 882         hints.setHint(RulerPainter.KEY_RULER_ENABLED, diagramDesc.isRulerVisible());
 883         snapAdvisor.setResolution(diagramDesc.getGridSize());
 884         hints.setHint(GridPainter.KEY_GRID_SIZE, diagramDesc.getGridSize());
 885     }
 886
 887     /**
 888      * Must be invoked from the AWT thread only.
 889      *
 890      * @param state
 891      * @param ctx
 892      */
 893     protected void applyEditorState(final EditorState state, final ICanvasContext ctx) {
 894         final IDiagram diagram = ctx.getHintStack().getHint(DiagramHints.KEY_DIAGRAM);
 895
 896         if (state.viewTransform != null && state.viewTransform.getDeterminant() != 0) {
 897             for (PanZoomRotateHandler h : ctx.getItemsByClass(PanZoomRotateHandler.class)) {
 898                 h.setTransform(state.viewTransform);
 899             }
 900         }
 901
 902         if (diagram != null) {
 903             if (state.viewTransform != null)
 904                 diagram.removeHint(DiagramHints.KEY_INITIAL_ZOOM_TO_FIT);
 905
 906             if (state.toolMode != null)
 907                 ctx.getDefaultHintContext().setHint(Hints.KEY_TOOL, state.toToolMode());
 908             else
 909                 ctx.getDefaultHintContext().setHint(Hints.KEY_TOOL, Hints.POINTERTOOL);
 910
 911             final Set<IElement> selected = DiagramEditorStates.toElements(state.selection, diagram);
 912             if (!selected.isEmpty()) {
 913                 for (Selection s : ctx.getItemsByClass(Selection.class)) {
 914                     s.setSelection(0, selected);
 915                 }
 916             }
 917         }
 918     }
 919
 920     protected EditorState getSavedEditorState(ICanvasContext ctx) {
 921         return DiagramEditorStates.toEditorState(ctx, true, true, true);
 922     }
 923
 924     protected void saveEditorState(ICanvasContext ctx) {
 925         DiagramEditorStates.saveEditorState(PREFERENCE_VIRTUAL_GRAPH, diagramResource, getSavedEditorState(ctx) , DiagramViewer.this);
 926     }
 927
 928     private boolean firstFocus = true;
 929
 930     public void setFocus() {
 931
 932         if(c != null) {
 933                 c.setFocus();
 934
 935                 if (firstFocus) {
 936                     // This is a workaround for using the symbol viewer in multi-page
 937                     // editors which causes the first zoom-to-fit scheduling to happen
 938                     // already before the controls have been laid out properly.
 939                     firstFocus = false;
 940                     firstTimeSetFocus();
 941                 }
 942
 943         }
 944
 945     }
 946
 947     protected void firstTimeSetFocus() {
 948         // [Tuukka@2010-02-11]
 949         // Removed since this is actually a workaround for multi-page editors.
 950         //scheduleZoomToFit();
 951     }
 952
 953     public void dispose() {
 954         // Deactivate all contexts here because after this the context service
 955         // in question will not be available.
 956         if (contextUtil != null) {
 957             contextUtil.deactivateAll();
 958         }
 959
 960         disposed = true;
 961
 962         if (hasDiagramSourceListener != null) {
 963             hasDiagramSourceListener.dispose();
 964             hasDiagramSourceListener = null;
 965         }
 966
 967         if (activation != null) {
 968             activation.deactivate();
 969             activation = null;
 970         }
 971
 972         if (resourceManager != null) {
 973                 resourceManager.dispose();
 974                 resourceManager = null;
 975         }
 976         //super.dispose();
 977     }
 978
 979     protected Resource getInputResource() {
 980         return getResourceInput().getResource();
 981     }
 982
 983     public IResourceEditorInput getResourceInput() {
 984         return (IResourceEditorInput) getEditorInput();
 985     }
 986
 987     public IResourceEditorInput2 getResourceInput2() {
 988         return (IResourceEditorInput2) getEditorInput();
 989     }
 990
 991     public void init(DiagramViewerHost _host, IEditorSite site, IEditorInput input, DataContainer<IDiagram> diagramContainer, WorkbenchSelectionProvider selectionProvider) {
 992         if (!(input instanceof IResourceEditorInput))
 993             throw new RuntimeException("Invalid input: must be IResourceEditorInput"); //$NON-NLS-1$
 994
 995         setHost(_host);
 996         setSite(site);
 997         setInput(input);
 998         this.sourceDiagramContainer = diagramContainer;
 999         this.selectionProvider = selectionProvider;
1000
1001         // Set initial part name according to the name given by IEditorInput
1002         host.doSetPartName(getEditorInput().getName());
1003
1004         Session session = Simantics.peekSession();
1005         if (session != null) {
1006             Supplier<Boolean> disposedCallback = () -> disposed;
1007             session.asyncRequest(
1008                     new TitleRequest(site.getId(), getResourceInput()),
1009                     new TitleUpdater(site.getShell().getDisplay(), host::doSetPartName, disposedCallback));
1010             session.asyncRequest(
1011                     new ToolTipRequest(site.getId(), getResourceInput()),
1012                     new TitleUpdater(site.getShell().getDisplay(), host::doSetTitleToolTip, disposedCallback));
1013         }
1014
1015         try {
1016             // Read previous editor state from the database
1017             editorState = DiagramEditorStates.readEditorState(getInputResource());
1018         } catch (DatabaseException e) {
1019             exception(e);
1020         }
1021     }
1022
1023     @SuppressWarnings("unchecked")
1024     @Override
1025     public <T> T getAdapter(Class<T> adapter) {
1026 //        System.out.println("diagramViewer getAdapter " + adapter);
1027         // Property view support
1028         if (adapter == IPropertyPage.class)
1029             return (T) createPropertyPage(getSite(), getPropertyPageContexts());
1030         // Provide symbols for the editor
1031         if (adapter == SymbolProviderFactory.class) {
1032             try {
1033                 return (T) DiagramTypeUtils.readSymbolProviderFactory(sessionContext.getSession(), diagramResource);
1034             } catch (DatabaseException e) {
1035                 ErrorLogger.defaultLogError(getClass() + " failed to adapt to SymbolProviderFactory, see exception for details.", e); //$NON-NLS-1$
1036                 return null;
1037             }
1038         }
1039         // Outline view support
1040         if (adapter == IContentOutlinePage.class)
1041             return (T) new DiagramOutlinePage(sessionContextProvider, getResourceInput2());
1042         // Role view support
1043         if (adapter == ILayersViewPage.class)
1044             return (T) new DiagramLayersPage(sourceDiagram, canvasContext);
1045         // Support external steering of the diagram canvas, zooming etc.
1046         if (adapter == ICanvasContext.class)
1047             return (T) canvasContext;
1048         // Support scene graph debugger view
1049         if (adapter == INode.class) {
1050             if (canvasContext != null) {
1051                 INode node = canvasContext.getCanvasNode();
1052                 if (node != null)
1053                     return (T) NodeUtil.getRootNode(node);
1054             }
1055             return null;
1056         }
1057         // Support retrieval of the current diagram.
1058         if (adapter == IDiagram.class)
1059             return (T) sourceDiagram;
1060         // Why is this here ??
1061         if (adapter == Session.class)
1062             return (T) sessionContext.getSession();
1063         if(adapter == RuntimeDiagramManager.class)
1064             return (T) runtimeDiagramManager;
1065         if (adapter == Resource.class)
1066             return (T) getRuntime();
1067         if (adapter == ICanvasChassis.class)
1068             return (T) c;
1069
1070         return null;
1071     }
1072
1073     //-------------------------------------------------------------------------
1074     // Profiling aid
1075
1076     protected static Object BEGIN(String name) {
1077         if (PROFILE) {
1078             //return ThreadLog.BEGIN(name);
1079         }
1080         return null;
1081     }
1082
1083     protected static void END(Object task) {
1084         if (PROFILE) {
1085             //((Task) task).end();
1086         }
1087     }
1088
1089     //-------------------------------------------------------------------------
1090     // implement ListenerSupport
1091
1092     @Override
1093     public void exception(Throwable t) {
1094         ErrorLogger.defaultLogError(t);
1095     }
1096
1097     @Override
1098     public boolean isDisposed() {
1099         return disposed;
1100     }
1101
1102     protected void collectGarbage() {
1103         SessionGarbageCollectorJob.getInstance().schedule(0);
1104         AWTThread.getThreadAccess().asyncExec(new Runnable() {
1105             @Override
1106             public void run() {
1107                 //System.out.println("BEFORE CLEAR: " + SVGCache.getSVGUniverse().report());
1108                 SVGCache.getSVGUniverse().clearUnreferenced();
1109                 //System.out.println("AFTER CLEAR: " + SVGCache.getSVGUniverse().report());
1110             }
1111         });
1112     }
1113
1114     //-------------------------------------------------------------------------
1115     // Listener for certain canvas context hint changes
1116
1117     IHintListener canvasHintListener = new HintListenerAdapter() {
1118         @Override
1119         public void hintChanged(IHintObservable sender, Key key, Object oldValue, Object newValue) {
1120             if (key == GridPainter.KEY_GRID_ENABLED) {
1121                 boolean v = Boolean.TRUE.equals(newValue);
1122                 if (diagramDesc.isGridVisible() != v)
1123                     setGlobalPreference(DiagramResource.URIs.DisplayGrid, v);
1124             } else if (key == RulerPainter.KEY_RULER_ENABLED) {
1125                 boolean v = Boolean.TRUE.equals(newValue);
1126                 if (diagramDesc.isRulerVisible() != v)
1127                     setGlobalPreference(DiagramResource.URIs.DisplayRuler, v);
1128             }
1129         }
1130     };
1131
1132     private <T> void setGlobalPreference(final String preferenceURI, boolean value) {
1133         TagUtil.execute(Simantics.getSession(), PREFERENCE_VIRTUAL_GRAPH, preferenceURI, value, Simantics.getProjectResource());
1134     }
1135
1136     /*
1137      * --------------------------------------------------------------------
1138      * Changes related to removal of EditorPart extension from here on down
1139      * --------------------------------------------------------------------
1140      */
1141
1142     private IWorkbenchPartSite partSite;
1143     private DiagramViewerHost host;
1144     private IEditorInput editorInput = null;
1145
1146     /* (non-Javadoc)
1147      * Method declared on IWorkbenchPart.
1148      */
1149     public IWorkbenchPartSite getSite() {
1150         return partSite;
1151     }
1152
1153     public IEditorSite getEditorSite() {
1154         return (IEditorSite) getSite();
1155     }
1156
1157     public IEditorInput getEditorInput() {
1158         return editorInput;
1159     }
1160
1161 //    protected void setPartName(String partName) {
1162 ////        if (compatibilityTitleListener != null) {
1163 ////            removePropertyListener(compatibilityTitleListener);
1164 ////            compatibilityTitleListener = null;
1165 ////        }
1166 ////
1167 ////        super.setPartName(partName);
1168 //    }
1169
1170 //    protected void setTitleToolTip(String toolTip) {
1171 ////        toolTip = Util.safeString(toolTip);
1172 ////        //Do not send changes if they are the same
1173 ////        if (Util.equals(this.toolTip, toolTip)) {
1174 ////                    return;
1175 ////            }
1176 ////        this.toolTip = toolTip;
1177 ////        firePropertyChange(IWorkbenchPart.PROP_TITLE);
1178 //    }
1179
1180     protected void setHost(DiagramViewerHost host) {
1181         this.host = host;
1182     }
1183
1184     protected void setSite(IWorkbenchPartSite site) {
1185         this.partSite = site;
1186     }
1187
1188     protected void setInput(IEditorInput input) {
1189         Assert.isLegal(input != null);
1190         editorInput = input;
1191     }
1192
1193     public Composite getComposite() {
1194         return c;
1195     }
1196
1197 }