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.CopyAsSVGParticipant;
  73 import org.simantics.diagram.participant.PointerInteractor2;
  74 import org.simantics.diagram.participant.SGFocusParticipant;
  75 import org.simantics.diagram.query.DiagramRequests;
  76 import org.simantics.diagram.runtime.RuntimeDiagramManager;
  77 import org.simantics.diagram.stubs.DiagramResource;
  78 import org.simantics.diagram.symbolcontribution.SymbolProviderFactory;
  79 import org.simantics.diagram.synchronization.CopyAdvisor;
  80 import org.simantics.diagram.synchronization.IModifiableSynchronizationContext;
  81 import org.simantics.diagram.synchronization.SynchronizationHints;
  82 import org.simantics.diagram.synchronization.graph.DiagramGraphUtil;
  83 import org.simantics.diagram.ui.DiagramModelHints;
  84 import org.simantics.diagram.ui.SWTPopupMenuParticipant;
  85 import org.simantics.diagram.ui.SWTPopupMenuParticipantAwt;
  86 import org.simantics.diagram.ui.WorkbenchSelectionProvider;
  87 import org.simantics.g2d.canvas.Hints;
  88 import org.simantics.g2d.canvas.ICanvasContext;
  89 import org.simantics.g2d.canvas.ICanvasParticipant;
  90 import org.simantics.g2d.canvas.impl.CanvasContext;
  91 import org.simantics.g2d.chassis.AWTChassis;
  92 import org.simantics.g2d.chassis.ICanvasChassis;
  93 import org.simantics.g2d.chassis.IChassisListener;
  94 import org.simantics.g2d.chassis.SWTChassis;
  95 import org.simantics.g2d.connection.IConnectionAdvisor;
  96 import org.simantics.g2d.diagram.DiagramClass;
  97 import org.simantics.g2d.diagram.DiagramHints;
  98 import org.simantics.g2d.diagram.IDiagram;
  99 import org.simantics.g2d.diagram.handler.PickRequest.PickFilter;
 100 import org.simantics.g2d.diagram.impl.Diagram;
 101 import org.simantics.g2d.diagram.participant.DelayedBatchElementPainter;
 102 import org.simantics.g2d.diagram.participant.DiagramParticipant;
 103 import org.simantics.g2d.diagram.participant.ElementInteractor;
 104 import org.simantics.g2d.diagram.participant.ElementPainter;
 105 import org.simantics.g2d.diagram.participant.Selection;
 106 import org.simantics.g2d.diagram.participant.TerminalPainter;
 107 import org.simantics.g2d.diagram.participant.ZOrderHandler;
 108 import org.simantics.g2d.diagram.participant.pointertool.PointerInteractor;
 109 import org.simantics.g2d.element.ElementClassProviders;
 110 import org.simantics.g2d.element.ElementClasses;
 111 import org.simantics.g2d.element.ElementUtils;
 112 import org.simantics.g2d.element.IElement;
 113 import org.simantics.g2d.element.IElementClassProvider;
 114 import org.simantics.g2d.element.handler.impl.StaticObjectAdapter;
 115 import org.simantics.g2d.elementclass.connection.ConnectionClass;
 116 import org.simantics.g2d.page.DiagramDesc;
 117 import org.simantics.g2d.participant.BackgroundPainter;
 118 import org.simantics.g2d.participant.CanvasBoundsParticipant;
 119 import org.simantics.g2d.participant.CanvasGrab;
 120 import org.simantics.g2d.participant.GridPainter;
 121 import org.simantics.g2d.participant.KeyUtil;
 122 import org.simantics.g2d.participant.MouseUtil;
 123 import org.simantics.g2d.participant.Notifications;
 124 import org.simantics.g2d.participant.PageBorderParticipant;
 125 import org.simantics.g2d.participant.PanZoomRotateHandler;
 126 import org.simantics.g2d.participant.PointerPainter;
 127 import org.simantics.g2d.participant.RenderingQualityInteractor;
 128 import org.simantics.g2d.participant.RulerPainter;
 129 import org.simantics.g2d.participant.SymbolUtil;
 130 import org.simantics.g2d.participant.TimeParticipant;
 131 import org.simantics.g2d.participant.TransformUtil;
 132 import org.simantics.g2d.participant.WorkbenchStatusLine;
 133 import org.simantics.g2d.participant.ZoomToAreaHandler;
 134 import org.simantics.g2d.tooltip.TerminalTooltipParticipant;
 135 import org.simantics.g2d.utils.CanvasUtils;
 136 import org.simantics.layer0.utils.triggers.IActivation;
 137 import org.simantics.layer0.utils.triggers.IActivationManager;
 138 import org.simantics.modeling.ModelingResources;
 139 import org.simantics.modeling.mapping.ComponentCopyAdvisor;
 140 import org.simantics.modeling.mapping.ElementCopyAdvisor;
 141 import org.simantics.modeling.mapping.MappedElementCopyAdvisor;
 142 import org.simantics.modeling.mapping.ModelingSynchronizationHints;
 143 import org.simantics.modeling.ui.diagramEditor.handlers.LinkBrowsingHandler;
 144 import org.simantics.modeling.ui.diagramEditor.handlers.StructuralBrowsingHandler;
 145 import org.simantics.modeling.ui.preferences.DiagramPreferenceUtil;
 146 import org.simantics.modeling.ui.preferences.DiagramPreferences;
 147 import org.simantics.project.ontology.ProjectResource;
 148 import org.simantics.scenegraph.INode;
 149 import org.simantics.scenegraph.g2d.snap.GridSnapAdvisor;
 150 import org.simantics.scenegraph.utils.NodeUtil;
 151 import org.simantics.selectionview.StandardPropertyPage;
 152 import org.simantics.structural.stubs.StructuralResource2;
 153 import org.simantics.structural2.modelingRules.IModelingRules;
 154 import org.simantics.ui.SimanticsUI;
 155 import org.simantics.ui.jobs.SessionGarbageCollectorJob;
 156 import org.simantics.ui.workbench.IPropertyPage;
 157 import org.simantics.ui.workbench.IResourceEditorInput;
 158 import org.simantics.ui.workbench.IResourceEditorInput2;
 159 import org.simantics.ui.workbench.TitleRequest;
 160 import org.simantics.ui.workbench.TitleUpdater;
 161 import org.simantics.ui.workbench.ToolTipRequest;
 162 import org.simantics.ui.workbench.editor.input.InputValidationCombinators;
 163 import org.simantics.utils.DataContainer;
 164 import org.simantics.utils.datastructures.hints.HintContext;
 165 import org.simantics.utils.datastructures.hints.HintListenerAdapter;
 166 import org.simantics.utils.datastructures.hints.IHintContext;
 167 import org.simantics.utils.datastructures.hints.IHintContext.Key;
 168 import org.simantics.utils.datastructures.hints.IHintListener;
 169 import org.simantics.utils.datastructures.hints.IHintObservable;
 170 import org.simantics.utils.threads.AWTThread;
 171 import org.simantics.utils.threads.IThreadWorkQueue;
 172 import org.simantics.utils.threads.SWTThread;
 173 import org.simantics.utils.threads.ThreadUtils;
 174 import org.simantics.utils.ui.ErrorLogger;
 175 import org.simantics.utils.ui.ExceptionUtils;
 176
 177 import com.kitfox.svg.SVGCache;
 178
 179 /**
 180  * @author Toni Kalajainen
 181  * @author Tuukka Lehtonen
 182  */
 183 public class DiagramViewer
 184   //extends EditorPart implements IResourceEditorPart2,
 185     implements ListenerSupport, IAdaptable {
 186
 187     public interface DiagramViewerHost {
 188         void doSetPartName(String name);
 189         void doSetTitleToolTip(String name);
 190     }
 191
 192     public static final String                      DIAGRAMMING_CONTEXT      = "org.simantics.modeling.ui.diagramming"; //$NON-NLS-1$
 193     private static final String                     PREFERENCE_VIRTUAL_GRAPH = "preferences"; //$NON-NLS-1$
 194
 195     private static final boolean                    PROFILE                  = false;
 196
 197     ParametrizedRead<IResourceEditorInput, Boolean> INPUT_VALIDATOR =
 198         Combinators.compose(
 199                 InputValidationCombinators.or(
 200                         // Normal configuration diagrams of a model
 201                         Combinators.compose(
 202                                 InputValidationCombinators.hasURI(),
 203                                 InputValidationCombinators.partialFunction(ModelingResources.URIs.DiagramToComposite)
 204                         ),
 205                         // Configuration diagrams of a component type
 206                         Combinators.compose(
 207                                 InputValidationCombinators.hasURI(),
 208                                 Combinators.compose(
 209                                         InputValidationCombinators.partialFunction(StructuralResource2.URIs.Defines),
 210                                         InputValidationCombinators.partialFunction(ModelingResources.URIs.DiagramToComposite)
 211                                 )
 212                         )
 213                 ),
 214                 InputValidationCombinators.extractInputResource()
 215         );
 216
 217     protected EditorState                editorState;
 218
 219     protected boolean                    disposed           = false;
 220     protected IThreadWorkQueue           swt;
 221     protected IStatusLineManager         statusLineManager;
 222     protected Display                    display;
 223     protected LocalResourceManager       resourceManager;
 224     protected SWTChassis                 c;
 225     protected IDiagram                   sourceDiagram;
 226     protected DataContainer<IDiagram>    sourceDiagramContainer;
 227     protected CanvasContext              canvasContext;
 228     protected ISessionContextProvider    sessionContextProvider;
 229     protected ISessionContext            sessionContext;
 230     protected Resource                   diagramResource;
 231     protected GraphToDiagramSynchronizer synchronizer;
 232     protected IActivation                activation;
 233     protected ContextUtil                contextUtil;
 234     protected SWTPopupMenuParticipant    popupMenuParticipant;
 235
 236     protected DiagramPreferences         diagramPreferences;
 237     protected DiagramDesc                diagramDesc;
 238     protected GridSnapAdvisor            snapAdvisor;
 239
 240     private RuntimeDiagramManager        runtimeDiagramManager;
 241     private Resource                     runtimeDiagramResourceCache;
 242     private HasDiagramSourceListener     hasDiagramSourceListener;
 243
 244     /**
 245      * Set externally in
 246      * {@link #init(DiagramViewerHost, IEditorSite, IEditorInput, DataContainer, WorkbenchSelectionProvider)}
 247      * .
 248      */
 249     protected WorkbenchSelectionProvider selectionProvider;
 250
 251     protected Resource getRuntimeFromManager() {
 252         RuntimeDiagramManager rtdm = runtimeDiagramManager;
 253         return (rtdm == null) ? null : rtdm.getRuntimeDiagram();
 254     }
 255
 256     public Resource getRuntime() {
 257         if (runtimeDiagramResourceCache != null)
 258             return runtimeDiagramResourceCache;
 259         runtimeDiagramResourceCache = getRuntimeFromManager();
 260         return runtimeDiagramResourceCache;
 261     }
 262
 263     public ParametrizedRead<IResourceEditorInput, Boolean> getInputValidator() {
 264         return INPUT_VALIDATOR;
 265     }
 266
 267     protected void addDropParticipants(ICanvasContext ctx) {
 268         ctx.getDefaultHintContext().setHint(Hints.KEY_ALLOWED_DRAG_ACTIONS, DnDConstants.ACTION_COPY);
 269
 270         ctx.add(new PopulateElementDropParticipant(synchronizer, getSite()));
 271         ctx.add(new PopulateElementMonitorDropParticipant(synchronizer, 0.5, 0.5));
 272     }
 273
 274     protected CopyPasteStrategy getCopyPasteStrategy() {
 275                 try {
 276                         CopyPasteStrategy cpStrategy = Simantics.getSession().syncRequest(new PossibleAdapter<CopyPasteStrategy>(getInputResource(), CopyPasteStrategy.class));
 277                         if(cpStrategy != null) return cpStrategy;
 278                 } catch (DatabaseException e) {
 279                 }
 280                 return getDefaultCopyPasteStrategy();
 281     }
 282
 283     protected CopyPasteStrategy getDefaultCopyPasteStrategy() {
 284         return new DefaultCopyPasteStrategy();
 285     }
 286
 287     protected CopyAdvisor getCopyAdvisor() {
 288                 try {
 289                         CopyAdvisor advisor = Simantics.getSession().syncRequest(new PossibleAdapter<CopyAdvisor>(getInputResource(), CopyAdvisor.class));
 290                         if(advisor != null) return advisor;
 291                 } catch (DatabaseException e) {
 292                 }
 293                 return new MappedElementCopyAdvisor(new ElementCopyAdvisor(), new ComponentCopyAdvisor());
 294     }
 295
 296     /**
 297      * @param ctx
 298      * TODO: change argument from CanvasContext to ICanvasContext
 299      */
 300     protected void addKeyBindingParticipants(CanvasContext ctx) {
 301         //ctx.add( new KeyToCommand( CommandKeyBinding.DEFAULT_BINDINGS ) );
 302         ctx.add(new DeleteHandler(statusLineManager));
 303         ctx.add(new CopyPasteHandler(getCopyPasteStrategy(), statusLineManager).setWorkbenchSite(getEditorSite()));
 304         ctx.add(new ConnectionCommandHandler());
 305     }
 306
 307     protected void addPopupmenu(ICanvasContext ctx) {
 308         ctx.add(popupMenuParticipant);
 309     }
 310
 311     protected void addWorkbenchSelectionProvider(ICanvasContext ctx) {
 312         if (selectionProvider != null)
 313             ctx.add(selectionProvider);
 314     }
 315
 316     protected void addViewManipulationParticipants(CanvasContext ctx) {
 317         ctx.add(new PanZoomRotateHandler());
 318         //ctx.add(new MousePanZoomInteractor());
 319         //ctx.add(new MultitouchPanZoomRotateInteractor());
 320         // ctx.add( new OrientationRestorer() );
 321         ctx.add(new ZoomToAreaHandler());
 322     }
 323
 324     protected void addDiagramParticipants(ICanvasContext ctx) {
 325         ctx.add(new ZOrderHandler());
 326         ctx.add(getPointerInteractor());
 327         ctx.add(new ElementInteractor());
 328         ctx.add(new Selection());
 329         ctx.add(new DiagramParticipant());
 330         ctx.add(new ElementPainter());
 331         //ctx.add(new ElementHeartbeater());
 332         //ctx.add(new ZoomTransitionParticipant(TransitionFunction.SIGMOID));
 333         //ctx.add(new TooltipParticipant());
 334         ctx.add(new TerminalTooltipParticipant());
 335         ctx.add(new ConnectionCrossingsParticipant(getInputResource()));
 336         ctx.add(new CopyAsSVGParticipant());
 337     }
 338
 339     protected void addPainterParticipants(ICanvasContext ctx) {
 340         ctx.add(new RenderingQualityInteractor());
 341         ctx.add(new TerminalPainter(true, true, false, true));
 342         ctx.add(new DelayedBatchElementPainter(PickFilter.FILTER_MONITORS, 500, TimeUnit.MILLISECONDS));
 343     }
 344
 345     protected void addStructureParticipants(ICanvasContext ctx) {
 346         addWorkbenchSelectionProvider(ctx);
 347         // Add visual browsing capabilities for structural models
 348         ctx.add(new StructuralBrowsingHandler(getSite(), sessionContext, getResourceInput2()));
 349         ctx.add(new LinkBrowsingHandler(getSite(), this, sessionContext));
 350     }
 351
 352     /**
 353      * Override to add any diagram/canvas participants to the canvas context
 354      * initialized for the editor.
 355      *
 356      * @param ctx
 357      */
 358     protected void addOtherParticipants(CanvasContext ctx) {
 359     }
 360
 361     public static Set<String> defaultPropertyBrowseContexts = Collections.singleton(ProjectResource.URIs.ProjectBrowseContext);
 362
 363     protected Set<String> getPropertyPageContexts() {
 364         try {
 365             return BrowseContext.getBrowseContextClosure(Simantics.getSession(), defaultPropertyBrowseContexts);
 366         } catch (DatabaseException e) {
 367             ExceptionUtils.logAndShowError(Messages.DiagramViewer_FailedtoLoadModeled, e);
 368             return defaultPropertyBrowseContexts;
 369         }
 370     }
 371
 372     protected IPropertyPage createPropertyPage(IWorkbenchPartSite site, Set<String> contexts) {
 373         return new StandardPropertyPage(site, contexts);
 374     }
 375
 376     protected String getPopupId() {
 377         return "#ModelingDiagramPopup"; //$NON-NLS-1$
 378     }
 379
 380     protected void getPreferences() {
 381         this.diagramPreferences = DiagramPreferenceUtil.getPreferences();
 382     }
 383
 384     protected void initSession() {
 385         sessionContextProvider = Simantics.getSessionContextProvider();
 386         sessionContext = sessionContextProvider.getSessionContext();
 387     }
 388
 389     protected void readNames() {
 390         String name = getEditorInput().getName();
 391         host.doSetPartName(name);
 392         host.doSetTitleToolTip(name);
 393     }
 394
 395     class ChassisListener implements IChassisListener {
 396         @Override
 397         public void chassisClosed(ICanvasChassis sender) {
 398             // Prevent deadlock while disposing which using syncExec would result in.
 399             final ICanvasContext ctx = canvasContext;
 400             ThreadUtils.asyncExec(ctx.getThreadAccess(), new Runnable() {
 401                 @Override
 402                 public void run() {
 403                     if (ctx != null) {
 404                         saveEditorState(ctx);
 405                         ctx.getHintStack().removeKeyHintListener(GridPainter.KEY_GRID_ENABLED, canvasHintListener);
 406                         ctx.getHintStack().removeKeyHintListener(RulerPainter.KEY_RULER_ENABLED, canvasHintListener);
 407                         final AWTChassis awtChassis = c.getAWTComponent();
 408                         if (awtChassis != null)
 409                             awtChassis.setCanvasContext(null);
 410                         ctx.dispose();
 411                     }
 412
 413                     if (sourceDiagramContainer != null) {
 414                         sourceDiagramContainer.set(null);
 415                         sourceDiagramContainer = null;
 416                     }
 417
 418                     if (sourceDiagram != null)
 419                         sourceDiagram.dispose();
 420
 421                     if(synchronizer != null) {
 422                         synchronizer.dispose();
 423                         // Let GC work.
 424                         synchronizer = null;
 425                     }
 426
 427                     if (runtimeDiagramManager != null) {
 428                         runtimeDiagramManager.dispose();
 429                         runtimeDiagramManager = null;
 430                     }
 431                 }
 432             });
 433             c.removeChassisListener(ChassisListener.this);
 434         }
 435     }
 436
 437     protected void createChassis(Composite parent) {
 438         resourceManager = new LocalResourceManager(JFaceResources.getResources(), parent);
 439         c = new SWTChassis(parent, 0);
 440
 441         Object task = BEGIN("DV.precreateParticipants"); //$NON-NLS-1$
 442         createCustomParticipants();
 443         END(task);
 444
 445         c.populate(component -> {
 446             if (!disposed) {
 447                 c.addChassisListener(new ChassisListener());
 448                 initializeCanvas();
 449             }
 450         });
 451     }
 452
 453     protected void beforeSetCanvasContext(ICanvasContext canvasContext2) {
 454     }
 455
 456     /**
 457      * Invoke this only from the AWT thread.
 458      * @param context
 459      */
 460     protected void setCanvasContext(ICanvasContext context) {
 461         // Cannot directly invoke SWTChassis.setCanvasContext only because it
 462         // needs to be invoked in the SWT thread and AWTChassis.setCanvasContext in the
 463         // AWT thread, but directly invoking SWTChassis.setCanvasContext would call both
 464         // in the SWT thread which would cause synchronous scheduling of AWT
 465         // runnables which is always a potential source of deadlocks.
 466         c.getAWTComponent().setCanvasContext(canvasContext);
 467         swt.asyncExec(new Runnable() {
 468             @Override
 469             public void run() {
 470                 if (!c.isDisposed())
 471                     // For AWT, this is a no-operation.
 472                     c.setCanvasContext(canvasContext);
 473             }
 474         });
 475     }
 476
 477     public void createPartControl(Composite parent) {
 478         //ProfileObserver.begin = System.nanoTime();
 479         display = parent.getDisplay();
 480         swt = SWTThread.getThreadAccess(display);
 481         statusLineManager = getEditorSite().getActionBars().getStatusLineManager();
 482
 483         Object task = BEGIN("DV.initSession"); //$NON-NLS-1$
 484         initSession();
 485         END(task);
 486
 487         diagramResource = getInputResource();
 488         readNames();
 489         getPreferences();
 490
 491         try {
 492             this.runtimeDiagramManager = RuntimeDiagramManager.track(sessionContext.getSession(), diagramResource, getEditorInput(), this);
 493
 494             // Create the canvas context here before finishing createPartControl
 495             // to give DiagramViewerActionContributor a chance to work.
 496             // The context can be created in SWT thread without scheduling
 497             // to the context thread and having potential deadlocks.
 498             IThreadWorkQueue thread = AWTThread.getThreadAccess();
 499             this.canvasContext = new CanvasContext(thread);
 500             this.canvasContext.setLocked(true);
 501
 502             task = BEGIN("DV.createChassis"); //$NON-NLS-1$
 503             createChassis(parent);
 504             END(task);
 505         } catch (DatabaseException e) {
 506             ErrorLogger.defaultLogError(e);
 507         }
 508     }
 509
 510
 511         /**
 512      * A method invoked before chassis construction for creating such
 513      * {@link ICanvasParticipant}s that need to be constructed in the SWT
 514      * thread.
 515      *
 516      * Use it for creating any such canvas participants during the viewer
 517      * construction and add them to the {@link ICanvasContext} later on from
 518      * the AWT thread.
 519      */
 520     protected void createCustomParticipants() {
 521         if (SimanticsUI.isLinuxGTK()) {
 522                 popupMenuParticipant = new SWTPopupMenuParticipantAwt(getSite(), c, display, getPopupId());
 523         } else {
 524                 popupMenuParticipant = new SWTPopupMenuParticipant(getSite(), c, display, getPopupId());
 525         }
 526     }
 527
 528     /**
 529      * Invoke this only from the AWT thread.
 530      */
 531     protected void initializeCanvas() {
 532         Object canvasInit = BEGIN("DV.canvasInitialization"); //$NON-NLS-1$
 533
 534         Object task = BEGIN("DV.createViewerCanvas"); //$NON-NLS-1$
 535         initializeCanvasContext(canvasContext);
 536         END(task);
 537
 538         beforeSetCanvasContext(canvasContext);
 539         //FullscreenUtils.addFullScreenHandler(canvasContext, s, canvasProvider);
 540
 541         // Without this all diagram participants will crash like there's no tomorrow.
 542         // Just trying to keep the behavior a bit more sane in case of
 543         // errors instead of flooding the console with exceptions.
 544         canvasContext.getDefaultHintContext().setHint(DiagramHints.KEY_DIAGRAM, Diagram.spawnNew(DiagramClass.DEFAULT));
 545
 546         // Changes in ruler/grid activity shall be written as
 547         // workspace-persistent diagram-specific preferences.
 548         canvasContext.getHintStack().addKeyHintListener(GridPainter.KEY_GRID_ENABLED, canvasHintListener);
 549         canvasContext.getHintStack().addKeyHintListener(RulerPainter.KEY_RULER_ENABLED, canvasHintListener);
 550
 551         task = BEGIN("DV.setCanvasContext"); //$NON-NLS-1$
 552         setCanvasContext(canvasContext);
 553         END(task);
 554
 555         // Finish loading in a worker thread because it may be a time consuming
 556         // process to load a large diagram and we don't want unnecessary AWT
 557         // thread contention.
 558         Job loadJob = new DiagramViewerLoadJob(this);
 559         loadJob.schedule();
 560
 561         END(canvasInit);
 562     }
 563
 564     protected void activateUiContexts(ContextUtil util) {
 565         util.activate(DIAGRAMMING_CONTEXT);
 566     }
 567
 568     /**
 569      * @param monitor the progress monitor to use for reporting progress to the
 570      *        user. It is the caller's responsibility to call done() on the
 571      *        given monitor. Accepts <code>null</code>, indicating that no
 572      *        progress should be reported and that the operation cannot be
 573      *        cancelled.
 574      */
 575     protected void performActivation(IProgressMonitor monitor) {
 576         SubMonitor progress = SubMonitor.convert(monitor, Messages.DiagramViewer_MonitorActivateMapping, 100);
 577         IActivationManager activationManager = sessionContext.getSession().peekService(IActivationManager.class);
 578         if (activationManager != null) {
 579             activation = activationManager.activate(diagramResource);
 580         }
 581         progress.worked(100);
 582     }
 583
 584     protected void onCreated() {
 585     }
 586
 587     /**
 588      * @param diagram
 589      */
 590     protected void scheduleZoomToFit(IDiagram diagram) {
 591         if (diagram == null)
 592             throw new IllegalStateException("diagram is null"); //$NON-NLS-1$
 593
 594         CanvasUtils.scheduleZoomToFit(swt, () -> disposed, canvasContext, diagram);
 595     }
 596
 597     /**
 598      * Subclasses may override but should always invoke super.
 599      *
 600      * @param diagram
 601      * @param initialHints
 602      * @throws DatabaseException
 603      */
 604     protected void fillInitialDiagramHints(Resource diagram, IHintContext initialHints) throws DatabaseException {
 605         IModelingRules modelingRules = sessionContext.getSession().syncRequest(
 606                 DiagramRequests.getModelingRules(diagram, null));
 607         if (modelingRules != null) {
 608             initialHints.setHint(DiagramModelHints.KEY_MODELING_RULES, modelingRules);
 609             initialHints.setHint(DiagramHints.CONNECTION_ADVISOR,
 610                     getConnectionAdvisor(modelingRules, sessionContext.getSession()));
 611         }
 612
 613         initialHints.setHint(SynchronizationHints.COPY_ADVISOR, getCopyAdvisor());
 614         initialHints.setHint(DiagramHints.KEY_USE_CONNECTION_FLAGS, Boolean.TRUE);
 615         initialHints.setHint(DiagramHints.KEY_ALLOW_CONNECTION_BRANCHING, Boolean.TRUE);
 616         initialHints.setHint(DiagramHints.KEY_ALLOW_ROUTE_POINTS, Boolean.TRUE);
 617     }
 618
 619     /**
 620      * @param monitor the progress monitor to use for reporting progress to the
 621      *        user. It is the caller's responsibility to call done() on the
 622      *        given monitor. Accepts <code>null</code>, indicating that no
 623      *        progress should be reported and that the operation cannot be
 624      *        cancelled.
 625      * @param r
 626      * @return
 627      * @throws DatabaseException
 628      */
 629     protected IDiagram loadDiagram(IProgressMonitor monitor, final Resource r) throws DatabaseException {
 630         // Pre-load modeling rules and possibly other hints too since they are
 631         // needed already while loading the diagram contents.
 632         IHintContext initialHints = new HintContext();
 633         fillInitialDiagramHints(r, initialHints);
 634         IDiagram d = loadDiagram(monitor, r, initialHints);
 635         return d;
 636     }
 637
 638     /**
 639      * @param monitor the progress monitor to use for reporting progress to the
 640      *        user. It is the caller's responsibility to call done() on the
 641      *        given monitor. Accepts <code>null</code>, indicating that no
 642      *        progress should be reported and that the operation cannot be
 643      *        cancelled.
 644      * @param diagram
 645      * @param initialHints
 646      * @return
 647      * @throws DatabaseException
 648      */
 649     protected IDiagram loadDiagram(IProgressMonitor monitor, Resource diagram, IHintContext initialHints) throws DatabaseException {
 650         RuntimeDiagramManager rtdm = runtimeDiagramManager;
 651         Resource runtimeDiagram = rtdm != null ? rtdm.getRuntimeDiagram() : null;
 652         IDiagramLoader loader = synchronizer;
 653         if (rtdm == null || runtimeDiagram == null || loader == null)
 654             return null;
 655         IDiagram d = sessionContext.getSession().syncRequest((Read<IDiagram>) graph -> {
 656             IDiagram result = DiagramRequests.loadDiagram(monitor, getResourceInput2().getModel(null), diagram,
 657                     runtimeDiagram, null, loader, initialHints).perform(graph);
 658
 659             // #399: Enable certain PropertyTester implementation without database transactions
 660             ModelingResources MOD = ModelingResources.getInstance(graph);
 661             Resource composite = graph.getPossibleObject(diagram, MOD.DiagramToComposite);
 662             result.setHint(
 663                     DiagramModelHints.KEY_DIAGRAM_RESOURCE_TYPE_URIS,
 664                     graph.syncRequest(new TypeURIs(diagram)));
 665             result.setHint(
 666                     DiagramModelHints.KEY_MAPPED_COMPOSITE_RESOURCE_TYPE_URIS,
 667                     composite != null ? graph.syncRequest(new TypeURIs(composite)) : Collections.emptySet());
 668
 669             Resource diagramSource = graph.syncRequest(
 670                     new PossibleObject(diagram, MOD.HasDiagramSource),
 671                     hasDiagramSourceListener = new HasDiagramSourceListener(sourceDiagramContainer));
 672             ElementUtils.setOrRemoveHint(
 673                     result,
 674                     DiagramModelHints.KEY_HAS_DIAGRAM_SOURCE,
 675                     diagramSource);
 676
 677             return result;
 678         });
 679         return d;
 680     }
 681
 682     protected void beforeSetDiagram(IDiagram diagram) {
 683     }
 684
 685     protected PointerInteractor getPointerInteractor() {
 686         return new PointerInteractor2(true, true, true, false, true, false, synchronizer.getElementClassProvider());
 687     }
 688
 689     protected IConnectionAdvisor getConnectionAdvisor(IModelingRules modelingRules, Session session) {
 690         return new ModelledConnectionAdvisor(modelingRules, sessionContext.getSession());
 691     }
 692
 693     protected GraphToDiagramSynchronizer createSynchronizer(final ICanvasContext ctx, final ISessionContext sessionContext) {
 694         try {
 695             return sessionContext.getSession().syncRequest(new Read<GraphToDiagramSynchronizer>() {
 696                 @Override
 697                 public GraphToDiagramSynchronizer perform(ReadGraph graph) throws DatabaseException {
 698                     GraphToDiagramSynchronizer sync = new GraphToDiagramSynchronizer(graph, ctx, createElementClassProvider(graph));
 699                     initializeSynchronizationContext(graph, sync);
 700                     return sync;
 701                 }
 702             });
 703         } catch (DatabaseException e) {
 704             throw new UnsupportedOperationException("Failed to initialize data model synchronizer", e); //$NON-NLS-1$
 705         }
 706     }
 707
 708     protected void initializeSynchronizationContext(ReadGraph graph, IModifiableSynchronizationContext context) {
 709         context.set(ModelingSynchronizationHints.MODELING_RESOURCE, ModelingResources.getInstance(graph));
 710     }
 711
 712     protected IElementClassProvider createElementClassProvider(ReadGraph graph) {
 713         DiagramResource dr = DiagramResource.getInstance(graph);
 714         return ElementClassProviders.mappedProvider(
 715                 ElementClasses.CONNECTION, ConnectionClass.CLASS.newClassWith(new StaticObjectAdapter(dr.RouteGraphConnection)),
 716                 ElementClasses.FLAG, FlagClassFactory.createFlagClass(dr.Flag, dr.Flag_Terminal)
 717         );
 718     }
 719
 720     protected SimpleElementTransformHandler getTransformHandler() {
 721         return new SimpleElementTransformHandler(true, true, true);
 722     }
 723
 724     public void initializeCanvasContext(CanvasContext ctx) {
 725         IHintContext h = ctx.getDefaultHintContext();
 726
 727         // The canvas context should not be painted until it is ready to avoid
 728         // unnecessary visual glitches.
 729         h.setHint(Hints.KEY_DISABLE_PAINTING, Boolean.TRUE);
 730
 731         Object task = BEGIN("createSynchronizer"); //$NON-NLS-1$
 732         this.synchronizer = createSynchronizer(ctx, sessionContext);
 733         END(task);
 734
 735         IContextService contextService = (IContextService) getSite().getService(IContextService.class);
 736         contextUtil = new ContextUtil(contextService, swt);
 737
 738         // Support & Util Participants
 739         ctx.add(new TransformUtil());
 740         ctx.add(new MouseUtil());
 741         ctx.add(new KeyUtil());
 742         ctx.add(contextUtil);
 743         ctx.add(new WorkbenchStatusLine(statusLineManager));
 744         ctx.add(new CanvasGrab());
 745         ctx.add(new SymbolUtil());
 746         ctx.add(new TimeParticipant());
 747         ctx.add(new CanvasBoundsParticipant());
 748         ctx.add(new Notifications());
 749
 750         ctx.add(new SGFocusParticipant(c, DIAGRAMMING_CONTEXT));
 751
 752         // Debug participant(s)
 753         // ctx.add( new PointerPainter() );
 754         // ctx.add( new HandPainter() );
 755         h.setHint(PointerPainter.KEY_PAINT_POINTER, true);
 756
 757         // Pan & Zoom & Rotate
 758         addViewManipulationParticipants(ctx);
 759
 760         ctx.add(getTransformHandler());
 761         ctx.add(new ExpandSelectionHandler(getEditorSite().getActionBars().getStatusLineManager()));
 762
 763         // Key bindings
 764         addKeyBindingParticipants(ctx);
 765
 766         // Grid & Ruler & Background
 767         addGridRulerBackgroundParticipants(ctx);
 768
 769         h.setHint(Hints.KEY_DISPLAY_PAGE, diagramPreferences.get(DiagramPreferences.P_DISPLAY_PAGE_SIZE));
 770         h.setHint(Hints.KEY_DISPLAY_MARGINS, diagramPreferences.get(DiagramPreferences.P_DISPLAY_MARGINS));
 771         ctx.add(new PageBorderParticipant());
 772
 773         // h.setHint(Hints.KEY_GRID_COLOR, new Color(0.9f, 0.9f, 0.9f));
 774         // h.setHint(Hints.KEY_BACKGROUND_COLOR, Color.LIGHT_GRAY);
 775         h.setHint(Hints.KEY_GRID_COLOR, new Color(0.9f, 0.9f, 0.9f));
 776         h.setHint(Hints.KEY_BACKGROUND_COLOR, Color.WHITE);
 777         h.setHint(RulerPainter.KEY_RULER_BACKGROUND_COLOR, new Color(0.9f, 0.9f, 0.9f, 0.75f));
 778         h.setHint(RulerPainter.KEY_RULER_TEXT_COLOR, Color.BLACK);
 779
 780         ////// Diagram Participants //////
 781         addDiagramParticipants(ctx);
 782         addPainterParticipants(ctx);
 783
 784         /////// D'n'D ///////
 785         addDropParticipants(ctx);
 786
 787         h.setHint(ElementPainter.KEY_SELECTION_FRAME_COLOR, Color.MAGENTA);
 788         h.setHint(Hints.KEY_TOOL, Hints.POINTERTOOL);
 789
 790         h.setHint(PanZoomRotateHandler.KEY_ZOOM_IN_LIMIT, 100000.0);
 791         h.setHint(PanZoomRotateHandler.KEY_ZOOM_OUT_LIMIT, 10.0);
 792
 793         Double snapResolution = diagramPreferences.get(DiagramPreferences.P_SNAP_GRID_SIZE);
 794         this.snapAdvisor = new GridSnapAdvisor(snapResolution);
 795         h.setHint(DiagramHints.SNAP_ADVISOR, this.snapAdvisor);
 796         h.setHint(GridPainter.KEY_GRID_SIZE, snapResolution);
 797         h.setHint(GridPainter.KEY_GRID_ENABLED, Boolean.FALSE);
 798
 799         // Workbench selection provider
 800         addStructureParticipants(ctx);
 801
 802         // Pop-up menu
 803         addPopupmenu(ctx);
 804
 805         // Load page frame description settings
 806         loadPageSettings(ctx);
 807
 808         addOtherParticipants(ctx);
 809
 810         ctx.assertParticipantDependencies();
 811         ctx.setLocked(false);
 812     }
 813
 814     protected void addGridRulerBackgroundParticipants(CanvasContext ctx) {
 815         ctx.add(new GridPainter());
 816         ctx.add(new RulerPainter());
 817         ctx.add(new BackgroundPainter());
 818     }
 819
 820     protected void loadPageSettings(ICanvasContext ctx) {
 821         DiagramDesc diagramDesc = null;
 822
 823         // load diagram page configuration
 824         if (diagramResource != null) {
 825             try {
 826                 diagramDesc = sessionContext.getSession().syncRequest(DiagramRequests.getDiagramDesc(diagramResource));
 827             } catch (DatabaseException e) {
 828                 ErrorLogger.defaultLogError(e);
 829             }
 830         }
 831
 832         if (diagramDesc == null) {
 833             // Take page description from the preferences if nothing else is available.
 834             final DiagramDesc desc = diagramDesc = diagramPreferences.getDiagramDesc();
 835
 836             // Write page configuration to graph
 837             sessionContext.getSession().asyncRequest(new WriteRequest() {
 838                 @Override
 839                 public void perform(WriteGraph graph) throws DatabaseException {
 840                     if (graph.isImmutable(diagramResource))
 841                         return;
 842                     CommonDBUtils.selectClusterSet(graph, diagramResource);
 843                     DiagramGraphUtil.setDiagramDesc(graph, diagramResource, desc);
 844                 }
 845             }, parameter -> {
 846                 if (parameter != null)
 847                     ErrorLogger.defaultLogError("Failed to write default diagram page description to database, see exception for details", parameter); //$NON-NLS-1$
 848             });
 849         }
 850
 851         setDiagramDesc(ctx, diagramDesc);
 852
 853         // Create a listener to react to page setting changes.
 854         sessionContext.getSession().asyncRequest(DiagramRequests.getDiagramDesc(diagramResource),
 855                 new ListenerDelegate<DiagramDesc>(this) {
 856             @Override
 857             public void execute(final DiagramDesc result) {
 858                 if (result != null && canvasContext != null) {
 859                     ThreadUtils.asyncExec(canvasContext.getThreadAccess(), new Runnable() {
 860                         @Override
 861                         public void run() {
 862                             if (!disposed)
 863                                 setDiagramDesc(canvasContext, result);
 864                         }
 865                     });
 866                 }
 867             }
 868         });
 869     }
 870
 871     protected void setDiagramDesc(ICanvasContext ctx, DiagramDesc diagramDesc) {
 872         if (diagramDesc == null)
 873             throw new NullPointerException("null diagram desc"); //$NON-NLS-1$
 874
 875         if (diagramDesc.equals(this.diagramDesc))
 876             return;
 877
 878         this.diagramDesc = diagramDesc;
 879         IHintContext hints = ctx.getDefaultHintContext();
 880         hints.setHint(Hints.KEY_PAGE_DESC, diagramDesc.getPageDesc());
 881         hints.setHint(Hints.KEY_DISPLAY_PAGE, diagramDesc.isPageBordersVisible());
 882         hints.setHint(Hints.KEY_DISPLAY_MARGINS, diagramDesc.isMarginsVisible());
 883         hints.setHint(GridPainter.KEY_GRID_ENABLED, diagramDesc.isGridVisible());
 884         hints.setHint(RulerPainter.KEY_RULER_ENABLED, diagramDesc.isRulerVisible());
 885         snapAdvisor.setResolution(diagramDesc.getGridSize());
 886         hints.setHint(GridPainter.KEY_GRID_SIZE, diagramDesc.getGridSize());
 887     }
 888
 889     /**
 890      * Must be invoked from the AWT thread only.
 891      *
 892      * @param state
 893      * @param ctx
 894      */
 895     protected void applyEditorState(final EditorState state, final ICanvasContext ctx) {
 896         final IDiagram diagram = ctx.getHintStack().getHint(DiagramHints.KEY_DIAGRAM);
 897
 898         if (state.viewTransform != null && state.viewTransform.getDeterminant() != 0) {
 899             for (PanZoomRotateHandler h : ctx.getItemsByClass(PanZoomRotateHandler.class)) {
 900                 h.setTransform(state.viewTransform);
 901             }
 902         }
 903
 904         if (diagram != null) {
 905             if (state.viewTransform != null)
 906                 diagram.removeHint(DiagramHints.KEY_INITIAL_ZOOM_TO_FIT);
 907
 908             if (state.toolMode != null)
 909                 ctx.getDefaultHintContext().setHint(Hints.KEY_TOOL, state.toToolMode());
 910             else
 911                 ctx.getDefaultHintContext().setHint(Hints.KEY_TOOL, Hints.POINTERTOOL);
 912
 913             final Set<IElement> selected = DiagramEditorStates.toElements(state.selection, diagram);
 914             if (!selected.isEmpty()) {
 915                 for (Selection s : ctx.getItemsByClass(Selection.class)) {
 916                     s.setSelection(0, selected);
 917                 }
 918             }
 919         }
 920     }
 921
 922     protected EditorState getSavedEditorState(ICanvasContext ctx) {
 923         return DiagramEditorStates.toEditorState(ctx, true, true, true);
 924     }
 925
 926     protected void saveEditorState(ICanvasContext ctx) {
 927         DiagramEditorStates.saveEditorState(PREFERENCE_VIRTUAL_GRAPH, diagramResource, getSavedEditorState(ctx) , DiagramViewer.this);
 928     }
 929
 930     private boolean firstFocus = true;
 931
 932     public void setFocus() {
 933
 934         if(c != null) {
 935                 c.setFocus();
 936
 937                 if (firstFocus) {
 938                     // This is a workaround for using the symbol viewer in multi-page
 939                     // editors which causes the first zoom-to-fit scheduling to happen
 940                     // already before the controls have been laid out properly.
 941                     firstFocus = false;
 942                     firstTimeSetFocus();
 943                 }
 944
 945         }
 946
 947     }
 948
 949     protected void firstTimeSetFocus() {
 950         // [Tuukka@2010-02-11]
 951         // Removed since this is actually a workaround for multi-page editors.
 952         //scheduleZoomToFit();
 953     }
 954
 955     public void dispose() {
 956         // Deactivate all contexts here because after this the context service
 957         // in question will not be available.
 958         if (contextUtil != null) {
 959             contextUtil.deactivateAll();
 960         }
 961
 962         disposed = true;
 963
 964         if (hasDiagramSourceListener != null) {
 965             hasDiagramSourceListener.dispose();
 966             hasDiagramSourceListener = null;
 967         }
 968
 969         if (activation != null) {
 970             activation.deactivate();
 971             activation = null;
 972         }
 973
 974         if (resourceManager != null) {
 975                 resourceManager.dispose();
 976                 resourceManager = null;
 977         }
 978         //super.dispose();
 979     }
 980
 981     protected Resource getInputResource() {
 982         return getResourceInput().getResource();
 983     }
 984
 985     public IResourceEditorInput getResourceInput() {
 986         return (IResourceEditorInput) getEditorInput();
 987     }
 988
 989     public IResourceEditorInput2 getResourceInput2() {
 990         return (IResourceEditorInput2) getEditorInput();
 991     }
 992
 993     public void init(DiagramViewerHost _host, IEditorSite site, IEditorInput input, DataContainer<IDiagram> diagramContainer, WorkbenchSelectionProvider selectionProvider) {
 994         if (!(input instanceof IResourceEditorInput))
 995             throw new RuntimeException("Invalid input: must be IResourceEditorInput"); //$NON-NLS-1$
 996
 997         setHost(_host);
 998         setSite(site);
 999         setInput(input);
1000         this.sourceDiagramContainer = diagramContainer;
1001         this.selectionProvider = selectionProvider;
1002
1003         // Set initial part name according to the name given by IEditorInput
1004         host.doSetPartName(getEditorInput().getName());
1005
1006         Session session = Simantics.peekSession();
1007         if (session != null) {
1008             Supplier<Boolean> disposedCallback = () -> disposed;
1009             session.asyncRequest(
1010                     new TitleRequest(site.getId(), getResourceInput()),
1011                     new TitleUpdater(site.getShell().getDisplay(), host::doSetPartName, disposedCallback));
1012             session.asyncRequest(
1013                     new ToolTipRequest(site.getId(), getResourceInput()),
1014                     new TitleUpdater(site.getShell().getDisplay(), host::doSetTitleToolTip, disposedCallback));
1015         }
1016
1017         try {
1018             // Read previous editor state from the database
1019             editorState = DiagramEditorStates.readEditorState(getInputResource());
1020         } catch (DatabaseException e) {
1021             exception(e);
1022         }
1023     }
1024
1025     @SuppressWarnings("unchecked")
1026     @Override
1027     public <T> T getAdapter(Class<T> adapter) {
1028 //        System.out.println("diagramViewer getAdapter " + adapter);
1029         // Property view support
1030         if (adapter == IPropertyPage.class)
1031             return (T) createPropertyPage(getSite(), getPropertyPageContexts());
1032         // Provide symbols for the editor
1033         if (adapter == SymbolProviderFactory.class) {
1034             try {
1035                 return (T) DiagramTypeUtils.readSymbolProviderFactory(sessionContext.getSession(), diagramResource);
1036             } catch (DatabaseException e) {
1037                 ErrorLogger.defaultLogError(getClass() + " failed to adapt to SymbolProviderFactory, see exception for details.", e); //$NON-NLS-1$
1038                 return null;
1039             }
1040         }
1041         // Outline view support
1042         if (adapter == IContentOutlinePage.class)
1043             return (T) new DiagramOutlinePage(sessionContextProvider, getResourceInput2());
1044         // Role view support
1045         if (adapter == ILayersViewPage.class)
1046             return (T) new DiagramLayersPage(sourceDiagram, canvasContext);
1047         // Support external steering of the diagram canvas, zooming etc.
1048         if (adapter == ICanvasContext.class)
1049             return (T) canvasContext;
1050         // Support scene graph debugger view
1051         if (adapter == INode.class) {
1052             if (canvasContext != null) {
1053                 INode node = canvasContext.getCanvasNode();
1054                 if (node != null)
1055                     return (T) NodeUtil.getRootNode(node);
1056             }
1057             return null;
1058         }
1059         // Support retrieval of the current diagram.
1060         if (adapter == IDiagram.class)
1061             return (T) sourceDiagram;
1062         // Why is this here ??
1063         if (adapter == Session.class)
1064             return (T) sessionContext.getSession();
1065         if(adapter == RuntimeDiagramManager.class)
1066             return (T) runtimeDiagramManager;
1067         if (adapter == Resource.class)
1068             return (T) getRuntime();
1069         if (adapter == ICanvasChassis.class)
1070             return (T) c;
1071
1072         return null;
1073     }
1074
1075     //-------------------------------------------------------------------------
1076     // Profiling aid
1077
1078     protected static Object BEGIN(String name) {
1079         if (PROFILE) {
1080             //return ThreadLog.BEGIN(name);
1081         }
1082         return null;
1083     }
1084
1085     protected static void END(Object task) {
1086         if (PROFILE) {
1087             //((Task) task).end();
1088         }
1089     }
1090
1091     //-------------------------------------------------------------------------
1092     // implement ListenerSupport
1093
1094     @Override
1095     public void exception(Throwable t) {
1096         ErrorLogger.defaultLogError(t);
1097     }
1098
1099     @Override
1100     public boolean isDisposed() {
1101         return disposed;
1102     }
1103
1104     protected void collectGarbage() {
1105         SessionGarbageCollectorJob.getInstance().schedule(0);
1106         AWTThread.getThreadAccess().asyncExec(new Runnable() {
1107             @Override
1108             public void run() {
1109                 //System.out.println("BEFORE CLEAR: " + SVGCache.getSVGUniverse().report());
1110                 SVGCache.getSVGUniverse().clearUnreferenced();
1111                 //System.out.println("AFTER CLEAR: " + SVGCache.getSVGUniverse().report());
1112             }
1113         });
1114     }
1115
1116     //-------------------------------------------------------------------------
1117     // Listener for certain canvas context hint changes
1118
1119     IHintListener canvasHintListener = new HintListenerAdapter() {
1120         @Override
1121         public void hintChanged(IHintObservable sender, Key key, Object oldValue, Object newValue) {
1122             if (key == GridPainter.KEY_GRID_ENABLED) {
1123                 boolean v = Boolean.TRUE.equals(newValue);
1124                 if (diagramDesc.isGridVisible() != v)
1125                     setGlobalPreference(DiagramResource.URIs.DisplayGrid, v);
1126             } else if (key == RulerPainter.KEY_RULER_ENABLED) {
1127                 boolean v = Boolean.TRUE.equals(newValue);
1128                 if (diagramDesc.isRulerVisible() != v)
1129                     setGlobalPreference(DiagramResource.URIs.DisplayRuler, v);
1130             }
1131         }
1132     };
1133
1134     private <T> void setGlobalPreference(final String preferenceURI, boolean value) {
1135         TagUtil.execute(Simantics.getSession(), PREFERENCE_VIRTUAL_GRAPH, preferenceURI, value, Simantics.getProjectResource());
1136     }
1137
1138     /*
1139      * --------------------------------------------------------------------
1140      * Changes related to removal of EditorPart extension from here on down
1141      * --------------------------------------------------------------------
1142      */
1143
1144     private IWorkbenchPartSite partSite;
1145     private DiagramViewerHost host;
1146     private IEditorInput editorInput = null;
1147
1148     /* (non-Javadoc)
1149      * Method declared on IWorkbenchPart.
1150      */
1151     public IWorkbenchPartSite getSite() {
1152         return partSite;
1153     }
1154
1155     public IEditorSite getEditorSite() {
1156         return (IEditorSite) getSite();
1157     }
1158
1159     public IEditorInput getEditorInput() {
1160         return editorInput;
1161     }
1162
1163 //    protected void setPartName(String partName) {
1164 ////        if (compatibilityTitleListener != null) {
1165 ////            removePropertyListener(compatibilityTitleListener);
1166 ////            compatibilityTitleListener = null;
1167 ////        }
1168 ////
1169 ////        super.setPartName(partName);
1170 //    }
1171
1172 //    protected void setTitleToolTip(String toolTip) {
1173 ////        toolTip = Util.safeString(toolTip);
1174 ////        //Do not send changes if they are the same
1175 ////        if (Util.equals(this.toolTip, toolTip)) {
1176 ////                    return;
1177 ////            }
1178 ////        this.toolTip = toolTip;
1179 ////        firePropertyChange(IWorkbenchPart.PROP_TITLE);
1180 //    }
1181
1182     protected void setHost(DiagramViewerHost host) {
1183         this.host = host;
1184     }
1185
1186     protected void setSite(IWorkbenchPartSite site) {
1187         this.partSite = site;
1188     }
1189
1190     protected void setInput(IEditorInput input) {
1191         Assert.isLegal(input != null);
1192         editorInput = input;
1193     }
1194
1195     public Composite getComposite() {
1196         return c;
1197     }
1198
1199 }