bundles/org.simantics.browsing.ui.swt/src/org/simantics/browsing/ui/swt/widgets/GraphExplorerComposite.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2012 Association for Decentralized Information Management
   3  * in Industry THTH ry.
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *     VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.browsing.ui.swt.widgets;
  13
  14 import java.util.Collection;
  15 import java.util.Collections;
  16 import java.util.HashSet;
  17 import java.util.Map;
  18 import java.util.Set;
  19 import java.util.function.BiFunction;
  20 import java.util.function.Consumer;
  21
  22 import org.eclipse.core.runtime.IAdaptable;
  23 import org.eclipse.core.runtime.Platform;
  24 import org.eclipse.jface.action.IMenuManager;
  25 import org.eclipse.jface.layout.GridDataFactory;
  26 import org.eclipse.jface.layout.GridLayoutFactory;
  27 import org.eclipse.jface.layout.TreeColumnLayout;
  28 import org.eclipse.jface.resource.JFaceResources;
  29 import org.eclipse.jface.resource.LocalResourceManager;
  30 import org.eclipse.jface.viewers.ColumnWeightData;
  31 import org.eclipse.jface.viewers.ISelectionProvider;
  32 import org.eclipse.swt.SWT;
  33 import org.eclipse.swt.dnd.DND;
  34 import org.eclipse.swt.dnd.DragSource;
  35 import org.eclipse.swt.dnd.DragSourceEvent;
  36 import org.eclipse.swt.dnd.DragSourceListener;
  37 import org.eclipse.swt.dnd.DropTarget;
  38 import org.eclipse.swt.dnd.DropTargetEvent;
  39 import org.eclipse.swt.dnd.DropTargetListener;
  40 import org.eclipse.swt.dnd.FileTransfer;
  41 import org.eclipse.swt.dnd.TextTransfer;
  42 import org.eclipse.swt.dnd.Transfer;
  43 import org.eclipse.swt.widgets.Composite;
  44 import org.eclipse.swt.widgets.Control;
  45 import org.eclipse.swt.widgets.Event;
  46 import org.eclipse.swt.widgets.Listener;
  47 import org.eclipse.swt.widgets.Tree;
  48 import org.eclipse.swt.widgets.TreeColumn;
  49 import org.eclipse.swt.widgets.TreeItem;
  50 import org.eclipse.ui.ISelectionListener;
  51 import org.eclipse.ui.IWorkbenchSite;
  52 import org.eclipse.ui.contexts.IContextService;
  53 import org.simantics.browsing.ui.BuiltinKeys;
  54 import org.simantics.browsing.ui.Column;
  55 import org.simantics.browsing.ui.ExplorerState;
  56 import org.simantics.browsing.ui.GraphExplorer;
  57 import org.simantics.browsing.ui.GraphExplorer.TransientExplorerState;
  58 import org.simantics.browsing.ui.NodeContext;
  59 import org.simantics.browsing.ui.StatePersistor;
  60 import org.simantics.browsing.ui.common.AdaptableHintContext;
  61 import org.simantics.browsing.ui.common.ColumnKeys;
  62 import org.simantics.browsing.ui.common.EvaluatorData;
  63 import org.simantics.browsing.ui.common.EvaluatorDataImpl;
  64 import org.simantics.browsing.ui.common.processors.ComparableFactoryResolver;
  65 import org.simantics.browsing.ui.common.processors.ComparableSelectorQueryProcessor;
  66 import org.simantics.browsing.ui.common.processors.FilterSelectionRequestQueryProcessor;
  67 import org.simantics.browsing.ui.common.processors.ImageDecoratorFactoryResolver;
  68 import org.simantics.browsing.ui.common.processors.ImagerFactoryResolver;
  69 import org.simantics.browsing.ui.common.processors.LabelDecoratorFactoryResolver;
  70 import org.simantics.browsing.ui.common.processors.LabelerFactoryResolver;
  71 import org.simantics.browsing.ui.common.processors.UserSelectedComparableFactoryQueryProcessor;
  72 import org.simantics.browsing.ui.common.processors.UserSelectedViewpointFactoryQueryProcessor;
  73 import org.simantics.browsing.ui.common.processors.ViewpointFactoryResolver;
  74 import org.simantics.browsing.ui.common.views.FilterAreaSource;
  75 import org.simantics.browsing.ui.common.views.IFilterArea;
  76 import org.simantics.browsing.ui.common.views.IFilterAreaProvider;
  77 import org.simantics.browsing.ui.graph.impl.AsyncReadGraphDataSource;
  78 import org.simantics.browsing.ui.graph.impl.Evaluators;
  79 import org.simantics.browsing.ui.graph.impl.InheritsQueryProcessor;
  80 import org.simantics.browsing.ui.graph.impl.ReadGraphDataSource;
  81 import org.simantics.browsing.ui.graph.impl.RelatedObjectsQueryProcessor;
  82 import org.simantics.browsing.ui.graph.impl.SessionContextInputSource;
  83 import org.simantics.browsing.ui.model.browsecontexts.BrowseContext;
  84 import org.simantics.browsing.ui.model.nodetypes.NodeType;
  85 import org.simantics.browsing.ui.swt.Activator;
  86 import org.simantics.browsing.ui.swt.ComparatorSelector;
  87 import org.simantics.browsing.ui.swt.ContextMenuInitializer;
  88 import org.simantics.browsing.ui.swt.DefaultExplorerSelectionListener;
  89 import org.simantics.browsing.ui.swt.DefaultIsCheckedProcessor2;
  90 import org.simantics.browsing.ui.swt.DefaultKeyListener;
  91 import org.simantics.browsing.ui.swt.DefaultMouseListener;
  92 import org.simantics.browsing.ui.swt.DefaultSelectionDataResolver;
  93 import org.simantics.browsing.ui.swt.FilterArea;
  94 import org.simantics.browsing.ui.swt.GraphExplorerFactory;
  95 import org.simantics.browsing.ui.swt.IContextMenuInitializer;
  96 import org.simantics.browsing.ui.swt.RootFilterArea;
  97 import org.simantics.browsing.ui.swt.StandardContextTypesQueryProcessor;
  98 import org.simantics.browsing.ui.swt.TypesQueryProcessor;
  99 import org.simantics.browsing.ui.swt.ViewpointSelector;
 100 import org.simantics.browsing.ui.swt.widgets.impl.Widget;
 101 import org.simantics.browsing.ui.swt.widgets.impl.WidgetSupport;
 102 import org.simantics.db.AsyncReadGraph;
 103 import org.simantics.db.ReadGraph;
 104 import org.simantics.db.Resource;
 105 import org.simantics.db.Session;
 106 import org.simantics.db.exception.DatabaseException;
 107 import org.simantics.db.layer0.SelectionHints;
 108 import org.simantics.db.layer0.request.PossibleVariable;
 109 import org.simantics.db.layer0.request.PossibleVariableRepresents;
 110 import org.simantics.db.layer0.variable.Variable;
 111 import org.simantics.db.management.ISessionContext;
 112 import org.simantics.db.management.ISessionContextChangedListener;
 113 import org.simantics.db.management.ISessionContextProvider;
 114 import org.simantics.db.management.SessionContextChangedEvent;
 115 import org.simantics.project.ProjectKeys;
 116 import org.simantics.ui.SimanticsUI;
 117 import org.simantics.ui.dnd.LocalObjectTransfer;
 118 import org.simantics.ui.dnd.LocalSelectionDragSourceListener;
 119 import org.simantics.ui.dnd.NoImageDragSourceEffect;
 120 import org.simantics.ui.dnd.SessionContainer;
 121 import org.simantics.ui.selection.AnyResource;
 122 import org.simantics.ui.selection.AnyVariable;
 123 import org.simantics.ui.selection.ExplorerColumnContentType;
 124 import org.simantics.ui.selection.ExplorerInputContentType;
 125 import org.simantics.ui.selection.WorkbenchSelectionContentType;
 126 import org.simantics.ui.selection.WorkbenchSelectionElement;
 127 import org.simantics.ui.selection.WorkbenchSelectionUtils;
 128 import org.simantics.utils.ObjectUtils;
 129 import org.simantics.utils.datastructures.Function;
 130 import org.simantics.utils.datastructures.disposable.DisposeState;
 131 import org.simantics.utils.datastructures.hints.HintListenerAdapter;
 132 import org.simantics.utils.datastructures.hints.HintTracker;
 133 import org.simantics.utils.datastructures.hints.IHintContext.Key;
 134 import org.simantics.utils.datastructures.hints.IHintListener;
 135 import org.simantics.utils.datastructures.hints.IHintObservable;
 136 import org.simantics.utils.datastructures.hints.IHintTracker;
 137 import org.slf4j.Logger;
 138 import org.slf4j.LoggerFactory;
 139
 140
 141 public class GraphExplorerComposite extends Composite implements Widget, IAdaptable {
 142
 143     private static final Logger LOGGER = LoggerFactory.getLogger(GraphExplorerComposite.class);
 144
 145     protected UserSelectedComparableFactoryQueryProcessor userSelectedComparableFactoryQueryProcessor;
 146     protected UserSelectedViewpointFactoryQueryProcessor  userSelectedViewpointFactoryQueryProcessor;
 147     protected FilterSelectionRequestQueryProcessor        filterSelectionRequestQueryProcessor;
 148     protected IFilterArea                                 filterArea;
 149     protected EvaluatorData                               evaluatorData;
 150
 151     protected LocalResourceManager                        resourceManager;
 152
 153     protected ISelectionListener                          workbenchSelectionListener;
 154
 155     private final int                                     style;
 156
 157     final private IWorkbenchSite                          site;
 158
 159     protected GraphExplorer                               explorer;
 160
 161     protected IMenuManager                                menuManager;
 162
 163     private final Map<String, Object>                     args;
 164
 165     protected ISessionContextProvider                       contextProvider;
 166
 167     private ISessionContext                               sessionContext;
 168
 169     private Object                                        dragSource;
 170
 171     private IHintTracker                                  sessionContextTracker = new SessionContextProjectTracker();
 172
 173     private InputSource                                   inputSource           = new DirectInputSource();
 174     private FilterAreaSource                              filterAreaSource    = new SelectionFilterAreaSource();
 175
 176     private final TreeColumnLayout                                                        ad;
 177     private String[]                                        editingColumn = ColumnKeys.KEYS_SINGLE;
 178
 179     private StatePersistor                                                                      persistor = null;
 180
 181     private final Composite                                                                       toolComposite;
 182     private final Composite                                                                       toolComposite2;
 183     private final Composite                                                                       explorerComposite;
 184     final private WidgetSupport                                 support;
 185     private final boolean                                                                       useNodeBrowseContexts;
 186     private final boolean                                                                       useNodeActionContexts;
 187
 188     static class SelectionElement extends AdaptableHintContext {
 189
 190         final public WorkbenchSelectionElement wse;
 191         final public Object content;
 192         final public Resource resource;
 193         final public Variable variable;
 194         final public Object input;
 195         final public TransientExplorerState explorerState;
 196
 197         private WorkbenchSelectionElement extractWse(Object content) {
 198             if(content instanceof NodeContext) {
 199                 NodeContext context = (NodeContext)content;
 200                 Object input = context.getConstant(NodeType.TYPE);
 201                 if(input instanceof NodeType)
 202                     return ((NodeType)input).getWorkbenchSelectionElement(context);
 203             }
 204             return null;
 205         }
 206
 207         private Resource extractResource(Object content) {
 208                 if(content instanceof NodeContext) {
 209                         NodeContext context = (NodeContext)content;
 210                         Object input = context.getConstant(BuiltinKeys.INPUT);
 211                         if(input instanceof Resource) return (Resource)input;
 212                         if(input instanceof IAdaptable) {
 213                                 Resource var = (Resource)((IAdaptable)input).getAdapter(Resource.class);
 214                                 if(var != null) return var;
 215                         }
 216                 }
 217                 return null;
 218         }
 219
 220         private Variable extractVariable(Object content) {
 221                 if(content instanceof NodeContext) {
 222                         NodeContext context = (NodeContext)content;
 223                         Object input = context.getConstant(BuiltinKeys.INPUT);
 224                         if(input instanceof Variable) return (Variable)input;
 225                         if(input instanceof IAdaptable) {
 226                                 Variable var = (Variable)((IAdaptable)input).getAdapter(Variable.class);
 227                                 if(var != null) return var;
 228                         }
 229                 }
 230                 return null;
 231         }
 232
 233         private Object extractInput(Object content) {
 234                 if(content instanceof NodeContext) {
 235                         NodeContext context = (NodeContext)content;
 236                         return context.getConstant(BuiltinKeys.INPUT);
 237                 }
 238                 return null;
 239         }
 240
 241         public SelectionElement(GraphExplorer explorer, Key[] keys, Object content) {
 242             super(keys);
 243             this.content = content;
 244             this.wse = extractWse(content);
 245             this.resource = extractResource(content);
 246             this.variable = extractVariable(content);
 247             this.input = extractInput(content);
 248             this.explorerState = explorer.getTransientState();
 249         }
 250
 251         @SuppressWarnings("unchecked")
 252         @Override
 253         public <T> T getContent(WorkbenchSelectionContentType<T> contentType) {
 254             if (wse != null) {
 255                 T result = wse.getContent(contentType);
 256                 if (result != null)
 257                     return result;
 258             }
 259
 260             if (contentType instanceof AnyResource) {
 261                 if (resource != null)
 262                     return (T) resource;
 263                 if (variable == null)
 264                     return null;
 265                 try {
 266                     return (T) ((AnyResource) contentType).processor.syncRequest(new PossibleVariableRepresents(variable));
 267                 } catch (DatabaseException e) {
 268                     LOGGER.error("Unexpected error occurred while resolving Resource from Variable " + variable, e);
 269                 }
 270             }
 271             else if (contentType instanceof AnyVariable) {
 272                 if (variable != null)
 273                     return (T) variable;
 274                 if (resource == null)
 275                     return null;
 276                 try {
 277                     return (T) ((AnyVariable) contentType).processor.syncRequest(new PossibleVariable(resource));
 278                 } catch (DatabaseException e) {
 279                     LOGGER.error("Unexpected error occurred while resolving Variable from Resource " + resource, e);
 280                 }
 281             } else if (contentType instanceof ExplorerInputContentType) {
 282                 return (T) input;
 283             } else if (contentType instanceof ExplorerColumnContentType) {
 284                 return (T) explorerState.getActiveColumn();
 285             }
 286             return null;
 287         }
 288
 289         @SuppressWarnings("rawtypes")
 290         @Override
 291         public Object getAdapter(Class adapter) {
 292                 if(WorkbenchSelectionElement.class == adapter) {
 293                         return wse;
 294                 }
 295                 if(NodeContext.class == adapter) {
 296                     if(content instanceof NodeContext)
 297                         return (NodeContext)content;
 298                     else
 299                         return null;
 300                 }
 301                 return super.getAdapter(adapter);
 302         }
 303
 304     }
 305     private BiFunction<GraphExplorer, Object[], Object[]> selectionTransformation = new BiFunction<GraphExplorer, Object[], Object[]>() {
 306
 307         private Key[] KEYS = new Key[] { SelectionHints.KEY_MAIN };
 308
 309         @Override
 310         public Object[] apply(GraphExplorer explorer, Object[] objects) {
 311             Object[] result = new Object[objects.length];
 312             for (int i = 0; i < objects.length; i++) {
 313                 SelectionElement context = new SelectionElement(explorer, KEYS, objects[i]);
 314                 context.setHint(SelectionHints.KEY_MAIN, objects[i]);
 315                 result[i] = context;
 316             }
 317             return result;
 318         }
 319
 320     };
 321
 322     private Set<String>                                   browseContexts        = null;
 323
 324     private DisposeState                                  disposeState          = DisposeState.Alive;
 325
 326     private boolean                                       created               = false;
 327
 328     protected String                                      contextMenuId         = null;
 329
 330     protected Set<String>                                 uiContext             = null;
 331
 332     protected ISessionContextChangedListener              contextChangeListener = new ISessionContextChangedListener() {
 333         @Override
 334         public void sessionContextChanged(SessionContextChangedEvent event) {
 335             sessionContext = event.getNewValue();
 336             sessionContextTracker.track(sessionContext);
 337         }
 338     };
 339
 340     public GraphExplorerComposite(Map<String, Object> args, IWorkbenchSite site, Composite parent, WidgetSupport support, int style) {
 341
 342         super(parent, SWT.NONE);
 343
 344         if (args == null)
 345             args = Collections.emptyMap();
 346
 347         this.args = args;
 348         this.site = site;
 349         this.style = style;
 350         this.resourceManager = new LocalResourceManager(JFaceResources.getResources(parent.getDisplay()), this);
 351
 352         contextProvider = getSessionContextProvider(site);
 353
 354         Integer maxChildren = (Integer)args.get("maxChildren");
 355
 356         GridLayoutFactory.fillDefaults().equalWidth(false).numColumns(1).margins(0,0).spacing(0,0).applyTo(this);
 357
 358         toolComposite = new Composite(this, SWT.NONE);
 359 //        toolComposite.setBackground(toolComposite.getDisplay().getSystemColor(SWT.COLOR_DARK_YELLOW));
 360 //        GridDataFactory.fillDefaults().grab(true, false).minSize(1, 1).applyTo(toolComposite);
 361         GridDataFactory.fillDefaults().grab(true, false).applyTo(toolComposite);
 362         GridLayoutFactory.fillDefaults().applyTo(toolComposite);
 363
 364         ad = new TreeColumnLayout();
 365         explorerComposite = new Composite(this, SWT.NONE);
 366         explorerComposite.setLayout(ad);
 367         GridDataFactory.fillDefaults().grab(true, true).minSize(1, 50).applyTo(explorerComposite);
 368
 369         if (args.containsKey("treeView") && Boolean.TRUE.equals(args.get("treeView"))) {
 370                 explorer = createExplorerControl2(explorerComposite, maxChildren);
 371         } else if (args.containsKey("natTable") && Boolean.TRUE.equals(args.get("natTable"))) {
 372                 explorer = createExplorerControl3(explorerComposite, maxChildren);
 373         } else {
 374                 explorer = createExplorerControl(explorerComposite, maxChildren);
 375         }
 376
 377         if (args.containsKey("useNodeBrowseContexts") && Boolean.TRUE.equals(args.get("useNodeBrowseContexts"))) {
 378                 useNodeBrowseContexts = true;
 379         } else {
 380                 useNodeBrowseContexts = false;
 381         }
 382
 383         if (args.containsKey("useNodeActionContexts") && Boolean.TRUE.equals(args.get("useNodeActionContexts"))) {
 384                 useNodeActionContexts = true;
 385         } else {
 386                 useNodeActionContexts = false;
 387         }
 388
 389         toolComposite2 = new Composite(this, SWT.NONE);
 390 //        toolComposite2.setBackground(toolComposite2.getDisplay().getSystemColor(SWT.COLOR_DARK_YELLOW));
 391 //        GridDataFactory.fillDefaults().grab(true, false).minSize(1, 1).applyTo(toolComposite);
 392         GridDataFactory.fillDefaults().grab(true, false).applyTo(toolComposite2);
 393         GridLayoutFactory.fillDefaults().applyTo(toolComposite2);
 394
 395         this.support = support;
 396
 397         if (support != null)
 398             support.register(this);
 399
 400     }
 401
 402     public GraphExplorerComposite(Map<String, Object> args, IWorkbenchSite site, Composite parent, int style) {
 403
 404         this(args, site, parent, null, style);
 405
 406     }
 407
 408     public ISessionContextProvider getSessionContextProvider(IWorkbenchSite site) {
 409         if(site != null)
 410             return SimanticsUI.getSessionContextProvider(site.getWorkbenchWindow());
 411         else
 412             return SimanticsUI.getSessionContextProvider();
 413     }
 414
 415     public GraphExplorer getExplorer() {
 416         return explorer;
 417     }
 418
 419     public Composite getExplorerComposite() {
 420         return explorerComposite;
 421     }
 422
 423     public <T> T getExplorerControl() {
 424         return explorer.getControl();
 425     }
 426
 427     public void addListenerToControl(int eventType, Listener listener) {
 428         ((Control)explorer.getControl()).addListener(eventType, listener);
 429     }
 430
 431     public void finish() {
 432         created = true;
 433         createControls(site);
 434         attachToSession();
 435     }
 436
 437     IWorkbenchSite getSite() {
 438         return site;
 439     }
 440
 441     protected void activateUiContexts() {
 442         Collection<String> contexts = getUiContexts();
 443         if (contexts == null || contexts.isEmpty())
 444             return;
 445         IWorkbenchSite site = getSite();
 446         if (site != null) {
 447             IContextService cs = (IContextService) getSite().getService(IContextService.class);
 448             for (String context : contexts)
 449                 cs.activateContext(context);
 450         }
 451     }
 452
 453     protected void createControls(IWorkbenchSite site) {
 454
 455         // Initialize explorer control.
 456 //        GridDataFactory.fillDefaults().grab(true, true).applyTo(explorer.getControl());
 457
 458         Control control = explorer.getControl();
 459
 460         // Initialize context menu if an initializer is provided.
 461         IContextMenuInitializer cmi = getContextMenuInitializer();
 462         if (cmi != null) {
 463             ISelectionProvider selectionProvider = (ISelectionProvider)explorer.getAdapter(ISelectionProvider.class);
 464             menuManager = cmi.createContextMenu(control, selectionProvider, site);
 465         }
 466
 467         // Initialize UI contexts
 468         activateUiContexts();
 469
 470         // Initialize DND.
 471         dragSource = setupDND(explorer);
 472
 473         // Listeners are only added once per listener, not every time the
 474         // session context changes.
 475         addListeners(explorer, menuManager);
 476
 477         userSelectedComparableFactoryQueryProcessor = new UserSelectedComparableFactoryQueryProcessor();
 478         userSelectedViewpointFactoryQueryProcessor = new UserSelectedViewpointFactoryQueryProcessor();
 479         filterSelectionRequestQueryProcessor = new FilterSelectionRequestQueryProcessor();
 480
 481         explorer.setPrimitiveProcessor(filterSelectionRequestQueryProcessor);
 482
 483         boolean hasExtraControls = false;
 484         boolean hasExtraControls2 = false;
 485
 486         Boolean displaySelectors = (Boolean)args.get("displaySelectors");
 487         if(displaySelectors == null || displaySelectors == true) {
 488
 489             @SuppressWarnings("unused")
 490             ComparatorSelector comparatorSelector = new ComparatorSelector(explorer, userSelectedComparableFactoryQueryProcessor, toolComposite, SWT.READ_ONLY);
 491 //            comparatorSelector.moveAbove(control);
 492
 493             @SuppressWarnings("unused")
 494             ViewpointSelector viewpointSelector = new ViewpointSelector(explorer, userSelectedViewpointFactoryQueryProcessor, toolComposite, SWT.READ_ONLY);
 495 //            viewpointSelector.moveAbove(control);
 496
 497             hasExtraControls = true;
 498
 499         }
 500
 501         Boolean displayFilter = (Boolean)args.get("displayFilter");
 502         if(displayFilter == null || displayFilter == true) {
 503
 504
 505                 filterArea = filterAreaSource.getFilterArea(toolComposite, explorer);
 506 //            filterArea = new FilterArea(explorer, filterSelectionRequestQueryProcessor, toolComposite, SWT.READ_ONLY);
 507             //filterArea.moveAbove(control);
 508
 509             hasExtraControls = true;
 510
 511         }
 512
 513         Boolean displayFilter2 = (Boolean)args.get("displayFilter2");
 514         if(displayFilter2 != null && displayFilter2 == true) {
 515
 516                 filterArea = filterAreaSource.getFilterArea(toolComposite2, explorer);
 517 //            filterArea = new FilterArea(explorer, filterSelectionRequestQueryProcessor, toolComposite2, SWT.READ_ONLY);
 518 //            //filterArea.moveAbove(control);
 519
 520             hasExtraControls2 = true;
 521
 522         }
 523
 524 //        filterArea = new FilterArea(explorer, filterSelectionRequestQueryProcessor, this, SWT.READ_ONLY);
 525 //        filterArea.moveAbove(control);
 526
 527         if(!hasExtraControls)
 528             GridDataFactory.fillDefaults().grab(true, false).minSize(0, 0).hint(0, 0).applyTo(toolComposite);
 529         if(!hasExtraControls2)
 530             GridDataFactory.fillDefaults().grab(true, false).minSize(0, 0).hint(0, 0).applyTo(toolComposite2);
 531
 532         GridDataFactory.fillDefaults().grab(true, true).span(2,1).applyTo(control);
 533
 534         //tree.getTree().setLayout(new FillLayout()
 535         //this.setLayout(LayoutUtils.createNoBorderGridLayout(2, false));
 536
 537         DropTarget target = new DropTarget(control, DND.DROP_COPY | DND.DROP_MOVE | DND.DROP_LINK | DND.DROP_DEFAULT);
 538         target.setTransfer(getAcceptedDataTypes());
 539         if (control instanceof Tree)  {
 540         target.addDropListener(new DropTargetListener() {
 541
 542             Tree tree = (Tree)explorer.getControl();
 543
 544             @Override
 545             public void dragEnter(DropTargetEvent event) {
 546                 event.detail = DND.DROP_COPY;
 547             }
 548
 549             @Override
 550             public void dragLeave(DropTargetEvent event) {
 551             }
 552
 553             @Override
 554             public void dragOperationChanged(DropTargetEvent event) {
 555             }
 556
 557             @Override
 558             public void dragOver(DropTargetEvent event) {
 559             }
 560
 561             @Override
 562             public void drop(DropTargetEvent event) {
 563                 TreeItem item = tree.getItem(tree.toControl(event.x, event.y));
 564                 if(item != null) {
 565                         Object data = item.getData();
 566                         if (data instanceof NodeContext)
 567                                 handleDrop(event.data, (NodeContext) data);
 568                         else if (data instanceof IAdaptable) {
 569                                 IAdaptable a = (IAdaptable) data;
 570                                 handleDrop(event.data, (NodeContext) a.getAdapter(NodeContext.class));
 571                         }
 572                 } else
 573                     handleDrop(event.data, null);
 574             }
 575
 576             @Override
 577             public void dropAccept(DropTargetEvent event) {
 578             }
 579
 580         });
 581         }
 582
 583         // Add workbench listeners and make sure they are cleaned up
 584         setWorkbenchListeners();
 585         control.addListener(SWT.Dispose, new Listener() {
 586             @Override
 587             public void handleEvent(Event event) {
 588                 doDispose();
 589             }
 590         });
 591     }
 592
 593     @SuppressWarnings({ "rawtypes", "unchecked" })
 594     @Override
 595     public Object getAdapter(Class adapter) {
 596         if (GraphExplorer.class == adapter)
 597             return explorer;
 598         if (EvaluatorData.class == adapter)
 599             return evaluatorData;
 600         if (BrowseContext.class == adapter) {
 601             EvaluatorData ed = evaluatorData;
 602             return ed != null ? ed.getBrowseContext() : null;
 603         }
 604         if (adapter == IFilterAreaProvider.class)
 605             return filterArea;
 606         return explorer.getAdapter(adapter);
 607     }
 608
 609     protected void doDispose() {
 610         //System.out.println(this + ".GraphExplorerComposite.doDispose()");
 611         removeWorkbenchListeners();
 612         userSelectedComparableFactoryQueryProcessor = null;
 613         userSelectedViewpointFactoryQueryProcessor = null;
 614         filterSelectionRequestQueryProcessor = null;
 615
 616         disposeState = DisposeState.Disposing;
 617         try {
 618             //System.out.println(this + ".GraphExplorerViewBase.dispose()");
 619             if (contextProvider != null) {
 620                 contextProvider.removeContextChangedListener(contextChangeListener);
 621                 contextProvider = null;
 622             }
 623             sessionContextTracker.untrack();
 624             resourceManager = null;
 625             explorer = null;
 626             sessionContext = null;
 627             dragSource = null;
 628 //            parent = null;
 629         } finally {
 630             disposeState = DisposeState.Disposed;
 631         }
 632     }
 633
 634     @Override
 635     public void dispose() {
 636         doDispose();
 637         super.dispose();
 638     }
 639
 640     protected StatePersistor getStatePersistor() {
 641         return persistor;
 642     }
 643
 644     public void setStatePersistor(StatePersistor persistor) {
 645         this.persistor = persistor;
 646     }
 647
 648     protected void initializeExplorer(GraphExplorer explorer, ISessionContext context) {
 649
 650         if(explorer == null || explorer.isDisposed()) return;
 651         if(context == null) return;
 652         if(browseContexts == null) return;
 653
 654         Session session = context != null ? context.getSession() : null;
 655         setupDragSource(session);
 656
 657         if (session != null) {
 658             evaluatorData = createEvaluatorData(session);
 659             explorer.setDataSource(new AsyncReadGraphDataSource(session));
 660             explorer.setDataSource(new ReadGraphDataSource(session));
 661         }
 662         else {
 663             evaluatorData = new EvaluatorDataImpl();
 664             explorer.removeDataSource(AsyncReadGraph.class);
 665             explorer.removeDataSource(ReadGraph.class);
 666         }
 667
 668         explorer.setPersistor(getStatePersistor());
 669
 670         explorer.setProcessor(new ComparableFactoryResolver(evaluatorData));
 671         explorer.setProcessor(new ViewpointFactoryResolver(evaluatorData));
 672         explorer.setProcessor(new LabelerFactoryResolver(evaluatorData));
 673         explorer.setProcessor(new ImagerFactoryResolver(evaluatorData));
 674         explorer.setProcessor(new LabelDecoratorFactoryResolver(evaluatorData));
 675         explorer.setProcessor(new ImageDecoratorFactoryResolver(evaluatorData));
 676         explorer.setProcessor(new DefaultIsCheckedProcessor2(evaluatorData));
 677         explorer.setPrimitiveProcessor(new TypesQueryProcessor());
 678         explorer.setPrimitiveProcessor(new StandardContextTypesQueryProcessor());
 679         explorer.setPrimitiveProcessor(new InheritsQueryProcessor());
 680         explorer.setPrimitiveProcessor(new RelatedObjectsQueryProcessor());
 681
 682         explorer.setPrimitiveProcessor(userSelectedViewpointFactoryQueryProcessor);
 683         explorer.setProcessor(new ComparableSelectorQueryProcessor());
 684         explorer.setPrimitiveProcessor(userSelectedComparableFactoryQueryProcessor);
 685         explorer.setPrimitiveProcessor(filterSelectionRequestQueryProcessor);
 686
 687         initializeExplorerWithEvaluator(explorer, context, evaluatorData);
 688     }
 689
 690     protected void initializeExplorerWithEvaluator(GraphExplorer explorer, ISessionContext context, EvaluatorData data) {
 691     }
 692
 693     protected EvaluatorData createEvaluatorData(Session context) {
 694
 695 //        Set<String> browseContexts = getArgument("browseContexts");
 696
 697         return Evaluators.load(context.getSession(), browseContexts, resourceManager, useNodeBrowseContexts, useNodeActionContexts);
 698
 699     }
 700
 701     protected Transfer[] getAcceptedDataTypes() {
 702         return new Transfer[] { LocalObjectTransfer.getTransfer(), FileTransfer.getInstance(), TextTransfer.getInstance() };
 703     }
 704
 705     protected void handleDrop(Object data, NodeContext target) {
 706     }
 707
 708     DragSourceListenerFactory dragSourceListenerFactory = new DragSourceListenerFactory() {
 709
 710         final Transfer[] transfers = new Transfer[] {LocalObjectTransfer.getTransfer(), TextTransfer.getInstance() };
 711
 712         @Override
 713         public DragSourceListener get(ISelectionProvider selectionProvider) {
 714
 715                 LocalSelectionDragSourceListener ls = new LocalSelectionDragSourceListener(selectionProvider);
 716
 717                 return new DragSourceListener() {
 718
 719                                 @Override
 720                                 public void dragStart(DragSourceEvent event) {
 721                                         ls.dragStart(event);
 722                                 }
 723
 724                                 @Override
 725                                 public void dragSetData(DragSourceEvent event) {
 726                                         if(TextTransfer.getInstance().isSupportedType(event.dataType)) {
 727                                         try {
 728                                                         event.data = WorkbenchSelectionUtils.getPossibleJSON(selectionProvider.getSelection());
 729                                                 } catch (DatabaseException e) {
 730                                                         event.data = "{ type:\"Exception\" }";
 731                                                         LOGGER.error("Failed to get current selection as JSON.", e);
 732                                                 }
 733                                         } else if (LocalObjectTransfer.getTransfer().isSupportedType(event.dataType)) {
 734                                                 ls.dragSetData(event);
 735                                         }
 736                                 }
 737
 738                                 @Override
 739                                 public void dragFinished(DragSourceEvent event) {
 740                                         ls.dragFinished(event);
 741                                 }
 742                         };
 743         }
 744
 745         @Override
 746         public Transfer[] getTransfers() {
 747             return transfers;
 748         }
 749
 750     };
 751
 752     public void setDragSourceListenerFactory(DragSourceListenerFactory dragSourceListenerFactory) {
 753         this.dragSourceListenerFactory = dragSourceListenerFactory;
 754     }
 755
 756     protected DragSourceListener setupDND(GraphExplorer explorer) {
 757
 758         ISelectionProvider selectionProvider = (ISelectionProvider)explorer.getAdapter(ISelectionProvider.class);
 759
 760         DragSourceListener listener = createDragSourceListener(selectionProvider);
 761
 762         Control control = explorer.getControl();
 763         DragSource source = createDragSource(control);
 764         source.setTransfer(getTransfers());
 765         source.addDragListener(listener);
 766         source.setDragSourceEffect(new NoImageDragSourceEffect(control));
 767
 768         return listener;
 769
 770     }
 771
 772     protected DragSourceListener createDragSourceListener(ISelectionProvider selectionProvider) {
 773         return dragSourceListenerFactory.get(selectionProvider);
 774     }
 775
 776     private int dragStyle = DND.DROP_LINK | DND.DROP_MOVE | DND.DROP_COPY | DND.DROP_DEFAULT;
 777
 778     protected void setDragStyle(int style) {
 779         this.dragStyle = style;
 780     }
 781
 782     protected int getDragStyle() {
 783         return dragStyle;
 784     }
 785
 786     protected DragSource createDragSource(Control control) {
 787         return new DragSource(control, getDragStyle());
 788     }
 789
 790     protected Transfer[] getTransfers() {
 791         return dragSourceListenerFactory.getTransfers();
 792     }
 793
 794     public EvaluatorData getEvaluatorData() {
 795         return evaluatorData;
 796     }
 797
 798     public interface InputSource {
 799         /**
 800          * @param ctx the session context to read the input from. May be
 801          *        <code>null</code> if there is no session.
 802          * @return the input object of a graph explorer. To indicate no input,
 803          *         use {@link GraphExplorerConstants#EMPTY_INPUT}. Never return
 804          *         <code>null</code>.
 805          */
 806         Object get(ISessionContext ctx, Object selection);
 807     }
 808
 809     public interface FilterSource {
 810
 811
 812
 813     }
 814
 815     /**
 816      * The default hint tracker that will be active if
 817      * {@link GraphExplorerComposite#setSessionContextTracker(IHintTracker) is
 818      * not called.
 819      */
 820     public class SessionContextProjectTracker extends HintTracker {
 821         public SessionContextProjectTracker() {
 822             IHintListener activeProjectListener = new HintListenerAdapter() {
 823                 @Override
 824                 public void hintChanged(IHintObservable sender, Key key, Object oldValue, Object newValue) {
 825                     applySessionContext(getSessionContext());
 826                 }
 827             };
 828             addKeyHintListener(ProjectKeys.KEY_PROJECT, activeProjectListener);
 829         }
 830     }
 831
 832     public class DirectInputSource implements InputSource {
 833         @Override
 834         public Object get(ISessionContext ctx, Object selection) {
 835             return selection;
 836         }
 837     }
 838
 839     public static class SelectionFilterAreaSource implements FilterAreaSource {
 840
 841                 @Override
 842                 public IFilterArea getFilterArea(Composite parent, GraphExplorer explorer) {
 843                         FilterSelectionRequestQueryProcessor processor = (FilterSelectionRequestQueryProcessor)explorer.getPrimitiveProcessor(BuiltinKeys.SELECTION_REQUESTS);
 844                         return new FilterArea(explorer, processor, parent, SWT.READ_ONLY);
 845                 }
 846
 847     }
 848
 849     public static class RootFilterAreaSource implements FilterAreaSource {
 850
 851                 @Override
 852                 public IFilterArea getFilterArea(Composite parent, GraphExplorer explorer) {
 853                         FilterSelectionRequestQueryProcessor processor = (FilterSelectionRequestQueryProcessor)explorer.getPrimitiveProcessor(BuiltinKeys.SELECTION_REQUESTS);
 854                         return new RootFilterArea(explorer, processor, parent, SWT.READ_ONLY);
 855                 }
 856
 857     }
 858
 859     protected void setSessionContextTracker(IHintTracker tracker) {
 860         this.sessionContextTracker = tracker;
 861     }
 862
 863     public void setInputSource(InputSource source) {
 864         this.inputSource = source;
 865     }
 866
 867     public void setFilterAreaSource(FilterAreaSource provider) {
 868         this.filterAreaSource = provider;
 869     }
 870
 871     public void setSelectionTransformation(BiFunction<GraphExplorer, Object[], Object[]> transformation) {
 872         this.selectionTransformation = transformation;
 873         if(explorer != null) explorer.setSelectionTransformation(transformation);
 874     }
 875
 876     protected Set<String> getBrowseContexts() {
 877         return browseContexts;
 878     }
 879
 880     public void setBrowseContexts(Set<String> contexts) {
 881         this.browseContexts = contexts;
 882         //initializeExplorer(explorer, getSessionContext());
 883     }
 884
 885     public void setBrowseContexts(String ... contexts) {
 886         this.browseContexts = new HashSet<String>();
 887         for(String s : contexts) this.browseContexts.add(s);
 888         initializeExplorer(explorer, getSessionContext());
 889     }
 890
 891     public void setContextMenuId(String contextMenuId) {
 892         this.contextMenuId = contextMenuId;
 893     }
 894
 895 //    protected IContextMenuInitializer getContextMenuInitializer() {
 896 //        String contextMenuId = getContextMenuId();
 897 //        if(contextMenuId != null) {
 898 //            return new ContextMenuInitializer(contextMenuId);
 899 //        } else {
 900 //            return null;
 901 //        }
 902 //    }
 903
 904     protected String getContextMenuId() {
 905         return this.contextMenuId;
 906     }
 907
 908     public void setUiContexts(Set<String> uiContext) {
 909         this.uiContext = uiContext;
 910     }
 911
 912     public Set<String> getUiContexts() {
 913         return uiContext;
 914     }
 915
 916     protected InputSource getInputSource() {
 917         return inputSource;
 918     }
 919
 920     protected Map<String, Object> getArguments() {
 921         return args;
 922     }
 923
 924     @SuppressWarnings("unchecked")
 925     protected <T> T getArgument(String key) {
 926         return (T) args.get(key);
 927     }
 928
 929     protected DisposeState getDisposeState() {
 930         return disposeState;
 931     }
 932
 933     public ISessionContext getSessionContext() {
 934         return sessionContext;
 935     }
 936
 937     public ISessionContextProvider getSessionContextProvider() {
 938         return contextProvider;
 939     }
 940
 941     @Override
 942     public boolean setFocus() {
 943         if (explorer != null && !explorer.isDisposed())
 944             explorer.setFocus();
 945         return true;
 946     }
 947
 948     public void setWorkbenchListeners() {
 949         if (workbenchSelectionListener == null && getSite() != null) {
 950             ISelectionProvider selectionProvider = (ISelectionProvider) explorer.getAdapter(ISelectionProvider.class);
 951             getSite().setSelectionProvider(selectionProvider);
 952
 953             // Listen to the workbench selection also to propagate it to
 954             // the explorer also.
 955             workbenchSelectionListener = new DefaultExplorerSelectionListener(site.getPage().getActivePart(), explorer);
 956             //System.out.println("ADD WORKBENCH SELECTION LISTENER: " + workbenchSelectionListener);
 957             getSite().getWorkbenchWindow().getSelectionService().addPostSelectionListener(workbenchSelectionListener);
 958         }
 959     }
 960
 961     protected void removeWorkbenchListeners() {
 962         //System.out.println("REMOVE WORKBENCH SELECTION LISTENER: " + workbenchSelectionListener);
 963         // Remember to remove the installed workbench selection listener
 964         if (workbenchSelectionListener != null) {
 965             getSite().getWorkbenchWindow().getSelectionService().removePostSelectionListener(workbenchSelectionListener);
 966             workbenchSelectionListener = null;
 967
 968             ISelectionProvider selectionProvider = (ISelectionProvider) explorer.getAdapter(ISelectionProvider.class);
 969             if(getSite().getSelectionProvider() == selectionProvider) getSite().setSelectionProvider(null);
 970
 971         }
 972     }
 973
 974     protected final void attachToSession() {
 975
 976         // Track active ISessionContext changes
 977         //contextProvider = SimanticsUI.getSessionContextProvider(getViewSite().getWorkbenchWindow());
 978         contextProvider.addContextChangedListener(contextChangeListener);
 979
 980         // Start tracking the current session context for input changes.
 981         // This will/must cause applySessionContext to get called.
 982         // Doing the applySessionContext initialization this way
 983         // instead of directly calling it will also make sure that
 984         // applySessionContext is only called once when first initialized,
 985         // and not twice like with the direct invocation.
 986         this.sessionContext = contextProvider.getSessionContext();
 987         sessionContextTracker.track(sessionContext);
 988     }
 989
 990     // /////////////////////////////////////////////////////////////////////////
 991     // Override / implement these:
 992
 993 //    /**
 994 //     * Returns an ID that is used for persisting a GraphExplorer instance.
 995 //     *
 996 //     * Used for </code>restoreState(IMemento)</code> and
 997 //     * <code>restoreState(IMemento)</code> in OntologyExplorer. Must be unique
 998 //     * within a workbench part.
 999 //     *
1000 //     * @return a unique name for this particular graph explorer view used for
1001 //     *         saving and restoring the state of this view part
1002 //     */
1003 //    public String getExplorerName() {
1004 //        return "GraphExplorerViewBase";
1005 //    }
1006
1007     /**
1008      * Override this method to add controls to the view part. This is invoked
1009      * before attaching the view part to a database session.
1010      *
1011      * @param parent
1012      */
1013     protected void createControls(Composite parent) {
1014
1015     }
1016
1017     /**
1018      * Override this method and provide a proper context menu initializer if you
1019      * want to have this base class initialize one for you.
1020      *
1021      * @return the initializer to be used by {@link #createControls(Composite)}
1022      */
1023     protected IContextMenuInitializer getContextMenuInitializer() {
1024         String contextMenuId = getContextMenuId();
1025         if(contextMenuId != null) {
1026             return new ContextMenuInitializer(contextMenuId);
1027         } else {
1028             return null;
1029         }
1030     }
1031
1032     /**
1033      * @param parent
1034      * @return
1035      */
1036     protected GraphExplorer createExplorerControl(Composite parent, Integer maxChildren) {
1037         GraphExplorerFactory factory = GraphExplorerFactory.getInstance();
1038         if(maxChildren != null) factory = factory.maxChildrenShown(maxChildren);
1039
1040         GraphExplorer ge = factory
1041         .selectionDataResolver(new DefaultSelectionDataResolver())
1042         .selectionTransformation(selectionTransformation)
1043         .setServiceLocator(site)
1044         .create(parent, style);
1045
1046         return ge;
1047     }
1048
1049     protected GraphExplorer createExplorerControl2(Composite parent, Integer maxChildren) {
1050         GraphExplorerFactory factory = GraphExplorerFactory.getInstance();
1051         if(maxChildren != null) factory = factory.maxChildrenShown(maxChildren);
1052
1053         GraphExplorer ge = factory
1054         .selectionDataResolver(new DefaultSelectionDataResolver())
1055         .selectionTransformation(selectionTransformation)
1056         .setServiceLocator(site)
1057         .create2(parent, style);
1058
1059         return ge;
1060     }
1061
1062     protected GraphExplorer createExplorerControl3(Composite parent, Integer maxChildren) {
1063         GraphExplorerFactory factory = GraphExplorerFactory.getInstance();
1064         if(maxChildren != null) factory = factory.maxChildrenShown(maxChildren);
1065
1066         GraphExplorer ge = factory
1067         .selectionDataResolver(new DefaultSelectionDataResolver())
1068         .selectionTransformation(selectionTransformation)
1069         .setServiceLocator(site)
1070         .create3(parent, style);
1071
1072         return ge;
1073     }
1074
1075     protected void setupDragSource(Session session) {
1076         if (dragSource instanceof SessionContainer) {
1077             ((SessionContainer) dragSource).setSession(session);
1078         }
1079     }
1080
1081     /**
1082      * Override to customize the addition of listeners a newly created
1083      * GraphExplorer.
1084      *
1085      * @param explorer
1086      */
1087     protected void addListeners(GraphExplorer explorer, IMenuManager menuManager) {
1088         addSelectionInputListeners(explorer, menuManager);
1089     }
1090
1091     protected void addSelectionInputListeners(GraphExplorer explorer, IMenuManager menuManager) {
1092         // Consider ENTER presses to simulate mouse left button double clicks
1093         explorer.addListener(new DefaultKeyListener(contextProvider, explorer, new Function<String[]>() {
1094             @Override
1095             public String[] execute(Object... obj) {
1096                 return getEditingColumn((NodeContext) obj[0]);
1097             }
1098         }));
1099         // Default double click handling
1100         explorer.addListener(new DefaultMouseListener(explorer));
1101     }
1102
1103     protected String[] getEditingColumn(NodeContext context) {
1104         return editingColumn;
1105     }
1106
1107     public void setEditingColumn(String... columnKeysInOrderOfTrial) {
1108         this.editingColumn = columnKeysInOrderOfTrial;
1109     }
1110
1111     // Needed for preventing unnecessary re-initialization of the explorer with the same input.
1112     private Object currentInput;
1113     private Object currentRoot;
1114
1115     /**
1116      * Invoke this to reinitialize the explorer and reset its input. The input
1117      * will be resolved from the specified ISessionContext based on the
1118      * {@link SessionContextInputSource} that is currently in use. If the input
1119      * is identical to the previous input, nothing will be done.
1120      *
1121      * @param context
1122      */
1123     public final boolean applySessionContext(ISessionContext context) {
1124
1125         // If control is not alive anymore, do nothing.
1126         //System.out.println(this + ": applySessionContext(" + context + "), explorer="  + explorer);
1127         if (disposeState != DisposeState.Alive)
1128             return false;
1129
1130         //System.out.println(this + ": initializeExplorer(" + explorer + ", " + context + ")");
1131         initializeExplorer(explorer, context);
1132
1133
1134         // Start tracking the session context.
1135         //
1136         // If this is not the same session that is currently tracked, it will
1137         // cause IHintListeners of the sessionContextTracker to fire.
1138         // For this we need the above input equality (identity) checking.
1139         // This is here just to make sure that we are tracking the correct
1140         // session context.
1141         sessionContextTracker.track(sessionContext);
1142
1143         this.sessionContext = context;
1144         Object root = inputSource.get(context, currentInput);
1145         if (ObjectUtils.objectEquals(root, currentRoot))
1146             return false;
1147
1148         currentRoot = root;
1149
1150         //System.out.println(this + ": setRoot(" + input + ")");
1151         explorer.setUIContexts(uiContext);
1152         explorer.setRoot(root);
1153
1154         return true;
1155
1156     }
1157
1158     protected boolean isImportantInput(Object previousSelection, Object selection) {
1159         return !ObjectUtils.objectEquals(previousSelection, selection);
1160     }
1161
1162     public void setInput(Object selection, boolean force) {
1163
1164         assert(created);
1165
1166         if (isDisposed())
1167             return;
1168         if (sessionContext == null)
1169             return;
1170
1171         // Check if this is a duplicate of the previous selection to reduce unnecessary flicker.
1172         if (!force && !isImportantInput(currentInput, selection))
1173             return;
1174
1175         currentInput = selection;
1176
1177         Object root = inputSource.get(sessionContext, selection);
1178
1179         currentRoot = root;
1180
1181         explorer.setUIContexts(uiContext);
1182
1183         if (root == null) {
1184             explorer.setRoot(GraphExplorer.EMPTY_INPUT);
1185         } else {
1186             explorer.setRoot(root);
1187         }
1188
1189     }
1190
1191     public void setColumnsVisible(boolean visible) {
1192         explorer.setColumnsVisible(visible);
1193     }
1194
1195     private int getColumnWidth(Column column, ExplorerState state) {
1196         // Get saved width from the persistor if there is one.
1197         if (state != null && state.columnWidths != null) {
1198                 Integer width = state.columnWidths.get(column.getLabel());
1199                 if (width != null)
1200                         return width;
1201         }
1202         return column.getWidth();
1203     }
1204
1205     public void setColumns(Column[] columns) {
1206
1207         explorer.setColumns(columns, new Consumer<Map<Column, Object>>() {
1208
1209             @Override
1210             public void accept(Map<Column, Object> objects) {
1211                 ExplorerState state = null;
1212                 if (persistor != null) {
1213                         state = persistor.deserialize(
1214                                 Platform.getStateLocation(Activator.getDefault().getBundle()).toFile(),
1215                                 explorer.getRoot());
1216                 }
1217
1218                 for(Map.Entry<Column, Object> entry : objects.entrySet()) {
1219                     Column column = entry.getKey();
1220                     TreeColumn treeColumn = (TreeColumn)entry.getValue();
1221
1222                     if (column.getWidth() < 0) {
1223                         throw new IllegalArgumentException("Column minimum width cannot be < 0, got " + column.getWidth());
1224                     }
1225
1226                     int width = getColumnWidth(column, state);
1227                     if(column.hasGrab()) {
1228
1229                         ad.setColumnData(treeColumn, new ColumnWeightData(column.getWeight(), width));
1230
1231                     } else {
1232
1233                         ad.setColumnData(treeColumn, new ColumnWeightData(0, width));
1234
1235                     }
1236
1237                 }
1238             }
1239
1240         });
1241
1242     }
1243
1244     @Override
1245     public void setInput(ISessionContext context, Object input) {
1246         setInput(input, false);
1247     }
1248
1249     public void setMaxChildren(int maxChildren) {
1250         explorer.setMaxChildren(maxChildren);
1251     }
1252
1253     public <T> void addListener(ExplorerMouseListenerImpl<T> listener) {
1254
1255         support.register(listener);
1256         listener.register(explorer);
1257         explorer.addListener(listener);
1258
1259     }
1260
1261 //    @Override
1262 //    public Point computeSize(int wHint, int hHint) {
1263 //      Point p = super.computeSize(wHint, hHint);
1264 //      System.err.println("graphExplorerComposite.computeSize " + p);
1265 //      return p;
1266 //    }
1267 //
1268 //    @Override
1269 //    public Point computeSize(int wHint, int hHint, boolean changed) {
1270 //      Point p = super.computeSize(wHint, hHint, changed);
1271 //      System.err.println("graphExplorerComposite.computeSize " + p);
1272 //      return p;
1273 //    }
1274
1275 }