gerrit.simantics Code Review - simantics/platform.git/blob

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