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

   1 /*******************************************************************************
   2  * Copyright (c) 2012 Original authors and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Eclipse Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/epl-v10.html
   7  *
   8  * Contributors:
   9  *     Original authors and others - initial API and implementation
  10  ******************************************************************************/
  11 package org.simantics.browsing.ui.nattable.override;
  12
  13 import java.util.ArrayList;
  14 import java.util.Collection;
  15 import java.util.List;
  16
  17 import org.eclipse.nebula.widgets.nattable.command.ILayerCommand;
  18 import org.eclipse.nebula.widgets.nattable.config.IConfigRegistry;
  19 import org.eclipse.nebula.widgets.nattable.hideshow.command.MultiRowHideCommand;
  20 import org.eclipse.nebula.widgets.nattable.hideshow.command.RowHideCommand;
  21 import org.eclipse.nebula.widgets.nattable.hideshow.event.HideRowPositionsEvent;
  22 import org.eclipse.nebula.widgets.nattable.hideshow.event.ShowRowPositionsEvent;
  23 import org.eclipse.nebula.widgets.nattable.layer.IUniqueIndexLayer;
  24 import org.eclipse.nebula.widgets.nattable.layer.LabelStack;
  25 import org.eclipse.nebula.widgets.nattable.layer.cell.ILayerCell;
  26 import org.eclipse.nebula.widgets.nattable.painter.cell.BackgroundPainter;
  27 import org.eclipse.nebula.widgets.nattable.painter.cell.CellPainterWrapper;
  28 import org.eclipse.nebula.widgets.nattable.painter.cell.ICellPainter;
  29 import org.eclipse.nebula.widgets.nattable.tree.ITreeRowModel;
  30 import org.eclipse.nebula.widgets.nattable.tree.TreeLayer;
  31 import org.eclipse.nebula.widgets.nattable.tree.config.DefaultTreeLayerConfiguration;
  32 import org.eclipse.nebula.widgets.nattable.tree.config.TreeConfigAttributes;
  33 import org.eclipse.nebula.widgets.nattable.tree.painter.IndentedTreeImagePainter;
  34
  35 import it.unimi.dsi.fastutil.ints.IntRBTreeSet;
  36
  37 public class TreeLayer2 extends AbstractRowHideShowLayer2 {
  38
  39     //private static final Log log = LogFactory.getLog(TreeLayer.class);
  40
  41     public static final String TREE_COLUMN_CELL = "TREE_COLUMN_CELL"; //$NON-NLS-1$
  42
  43     public static final int TREE_COLUMN_NUMBER = 0;
  44
  45     /**
  46      * Flag to configure whether the tree column should be identified by
  47      * position or by index. Default is position.
  48      */
  49     private boolean useTreeColumnIndex = false;
  50
  51     /**
  52      * The ITreeRowModelListener that is used to get information about the tree
  53      * structure.
  54      */
  55     private final ITreeRowModel<?> treeRowModel;
  56
  57     /**
  58      * Collection of all row indexes that are hidden if tree nodes are
  59      * collapsed.
  60      * <p>
  61      * Note: This collection is only in use if the used {@link ITreeRowModel}
  62      * implementation is returning the row indexes of affected rows on
  63      * expand/collapse. There are also implementations that use another approach
  64      * where the hide/show approach is not used (e.g. GlazedListTreeRowModel)
  65      * </p>
  66      */
  67         private final IntRBTreeSet hiddenRowIndexes = new IntRBTreeSet();
  68
  69     /**
  70      * The IndentedTreeImagePainter that paints indentation to the left of the
  71      * configured base painter and icons for expand/collapse if possible, to
  72      * render tree structure accordingly.
  73      */
  74     private IndentedTreeImagePainter indentedTreeImagePainter;
  75
  76     /**
  77      * Creates a TreeLayer instance based on the given information. Will use a
  78      * default IndentedTreeImagePainter that uses 10 pixels for indentation and
  79      * simple + and - icons for expand/collapse icons. It also uses the
  80      * DefaultTreeLayerConfiguration.
  81      *
  82      * @param underlyingLayer
  83      *            The underlying layer on whose top this layer will be set.
  84      * @param treeRowModel
  85      *            The ITreeRowModelListener that is used to get information
  86      *            about the tree structure.
  87      */
  88     public TreeLayer2(IUniqueIndexLayer underlyingLayer, ITreeRowModel<?> treeRowModel) {
  89         this(underlyingLayer, treeRowModel, new IndentedTreeImagePainter());
  90     }
  91
  92     /**
  93      * Creates a TreeLayer instance based on the given information. Allows to
  94      * specify the IndentedTreeImagePainter while using the
  95      * DefaultTreeLayerConfiguration.
  96      *
  97      * @param underlyingLayer
  98      *            The underlying layer on whose top this layer will be set.
  99      * @param treeRowModel
 100      *            The ITreeRowModelListener that is used to get information
 101      *            about the tree structure.
 102      * @param indentedTreeImagePainter
 103      *            The IndentedTreeImagePainter that paints indentation to the
 104      *            left of the configured base painter and icons for
 105      *            expand/collapse if possible, to render tree structure
 106      *            accordingly.
 107      */
 108     public TreeLayer2(
 109             IUniqueIndexLayer underlyingLayer,
 110             ITreeRowModel<?> treeRowModel,
 111             IndentedTreeImagePainter indentedTreeImagePainter) {
 112         this(underlyingLayer, treeRowModel, indentedTreeImagePainter, true);
 113     }
 114
 115     /**
 116      * Creates a TreeLayer instance based on the given information. Will use a
 117      * default IndentedTreeImagePainter that uses 10 pixels for indentation and
 118      * simple + and - icons for expand/collapse icons.
 119      *
 120      * @param underlyingLayer
 121      *            The underlying layer on whose top this layer will be set.
 122      * @param treeRowModel
 123      *            The ITreeRowModelListener that is used to get information
 124      *            about the tree structure.
 125      * @param useDefaultConfiguration
 126      *            <code>true</code> to use the DefaultTreeLayerConfiguration,
 127      *            <code>false</code> if you want to specify your own
 128      *            configuration.
 129      */
 130     public TreeLayer2(
 131             IUniqueIndexLayer underlyingLayer,
 132             ITreeRowModel<?> treeRowModel,
 133             boolean useDefaultConfiguration) {
 134         this(underlyingLayer,
 135                 treeRowModel,
 136                 new IndentedTreeImagePainter(),
 137                 useDefaultConfiguration);
 138     }
 139
 140     /**
 141      * Creates a TreeLayer instance based on the given information.
 142      *
 143      * @param underlyingLayer
 144      *            The underlying layer on whose top this layer will be set.
 145      * @param treeRowModel
 146      *            The ITreeRowModelListener that is used to get information
 147      *            about the tree structure.
 148      * @param indentedTreeImagePainter
 149      *            The IndentedTreeImagePainter that paints indentation to the
 150      *            left of the configured base painter and icons for
 151      *            expand/collapse if possible, to render tree structure
 152      *            accordingly.
 153      * @param useDefaultConfiguration
 154      *            <code>true</code> to use the DefaultTreeLayerConfiguration,
 155      *            <code>false</code> if you want to specify your own
 156      *            configuration.
 157      */
 158     public TreeLayer2(
 159             IUniqueIndexLayer underlyingLayer,
 160             ITreeRowModel<?> treeRowModel,
 161             IndentedTreeImagePainter indentedTreeImagePainter,
 162             boolean useDefaultConfiguration) {
 163
 164         super(underlyingLayer);
 165         this.treeRowModel = treeRowModel;
 166
 167         if (useDefaultConfiguration) {
 168             addConfiguration(new DefaultTreeLayerConfiguration2(this));
 169         }
 170
 171         this.indentedTreeImagePainter = indentedTreeImagePainter;
 172
 173         registerCommandHandler(new TreeExpandCollapseCommandHandler(this));
 174         registerCommandHandler(new TreeCollapseAllCommandHandler(this));
 175         registerCommandHandler(new TreeExpandAllCommandHandler(this));
 176         registerCommandHandler(new TreeExpandToLevelCommandHandler(this));
 177     }
 178
 179     @Override
 180     public LabelStack getConfigLabelsByPosition(int columnPosition, int rowPosition) {
 181         LabelStack configLabels = super.getConfigLabelsByPosition(columnPosition, rowPosition);
 182
 183         if (isTreeColumn(columnPosition)) {
 184             configLabels.addLabelOnTop(TREE_COLUMN_CELL);
 185
 186             int rowIndex = getRowIndexByPosition(rowPosition);
 187             configLabels.addLabelOnTop(
 188                     DefaultTreeLayerConfiguration.TREE_DEPTH_CONFIG_TYPE + this.treeRowModel.depth(rowIndex));
 189             if (!this.treeRowModel.hasChildren(rowIndex)) {
 190                 configLabels.addLabelOnTop(DefaultTreeLayerConfiguration.TREE_LEAF_CONFIG_TYPE);
 191             } else {
 192                 if (this.treeRowModel.isCollapsed(rowIndex)) {
 193                     configLabels.addLabelOnTop(DefaultTreeLayerConfiguration.TREE_COLLAPSED_CONFIG_TYPE);
 194                 } else {
 195                     configLabels.addLabelOnTop(DefaultTreeLayerConfiguration.TREE_EXPANDED_CONFIG_TYPE);
 196                 }
 197             }
 198         }
 199         return configLabels;
 200     }
 201
 202     /**
 203      * @return The ITreeRowModelListener that is used to get information about
 204      *         the tree structure.
 205      */
 206     public ITreeRowModel<?> getModel() {
 207         return this.treeRowModel;
 208     }
 209
 210     /**
 211      * @return The IndentedTreeImagePainter that paints indentation to the left
 212      *         of the configured base painter and icons for expand/collapse if
 213      *         possible, to render tree structure accordingly.
 214      *
 215      * @deprecated since 1.1 the configured TreeImagePainter should be used
 216      *             instead of the hard referenced one
 217      */
 218     @Deprecated
 219     public IndentedTreeImagePainter getIndentedTreeImagePainter() {
 220         return this.indentedTreeImagePainter;
 221     }
 222
 223     /**
 224      * @return The ICellPainter that is used to paint the images in the tree by
 225      *         the IndentedTreeImagePainter. Usually it is some type of
 226      *         TreeImagePainter that paints expand/collapse/leaf icons regarding
 227      *         the node state.<br>
 228      *         Can be <code>null</code> if set explicitly to the
 229      *         IndentedTreeImagePainter!
 230      *
 231      * @deprecated since 1.1 the configured TreeImagePainter should be used
 232      *             instead of the hard referenced one
 233      */
 234     @Deprecated
 235     public ICellPainter getTreeImagePainter() {
 236         return this.indentedTreeImagePainter != null ? this.indentedTreeImagePainter
 237                 .getTreeImagePainter() : null;
 238     }
 239
 240     /**
 241      * @param columnPosition
 242      *            The column position to check.
 243      * @return <code>true</code> if the given column position is the tree
 244      *         column, <code>false</code> if not.
 245      */
 246     private boolean isTreeColumn(int columnPosition) {
 247         if (this.useTreeColumnIndex)
 248             return getColumnIndexByPosition(columnPosition) == TREE_COLUMN_NUMBER;
 249
 250         return columnPosition == TREE_COLUMN_NUMBER;
 251     }
 252
 253     @Override
 254     public ICellPainter getCellPainter(
 255             int columnPosition, int rowPosition,
 256             ILayerCell cell, IConfigRegistry configRegistry) {
 257         ICellPainter cellPainter = super.getCellPainter(
 258                 columnPosition, rowPosition, cell, configRegistry);
 259
 260         if (cell.getConfigLabels().hasLabel(TREE_COLUMN_CELL)) {
 261
 262             ICellPainter treeCellPainter = configRegistry.getConfigAttribute(
 263                     TreeConfigAttributes.TREE_STRUCTURE_PAINTER,
 264                     cell.getDisplayMode(),
 265                     cell.getConfigLabels().getLabels());
 266
 267             if (treeCellPainter != null) {
 268                 ICellPainter innerWrapper = treeCellPainter;
 269                 IndentedTreeImagePainter treePainter = null;
 270                 if (innerWrapper instanceof IndentedTreeImagePainter) {
 271                     treePainter = (IndentedTreeImagePainter) innerWrapper;
 272                 } else {
 273                     while (treePainter == null
 274                             && innerWrapper != null
 275                             && innerWrapper instanceof CellPainterWrapper
 276                             && ((CellPainterWrapper) innerWrapper).getWrappedPainter() != null) {
 277
 278                         innerWrapper = ((CellPainterWrapper) innerWrapper).getWrappedPainter();
 279                         if (innerWrapper instanceof IndentedTreeImagePainter) {
 280                             treePainter = (IndentedTreeImagePainter) innerWrapper;
 281                         }
 282                     }
 283                 }
 284
 285                 if (treePainter != null) {
 286                     treePainter.setBaseCellPainter(cellPainter);
 287                     cellPainter = treeCellPainter;
 288                 } else {
 289                     // log error
 290 //                    log.warn("There is no IndentedTreeImagePainter found for TREE_STRUCTURE_PAINTER, " //$NON-NLS-1$
 291 //                            + "using local configured IndentedTreeImagePainter as fallback"); //$NON-NLS-1$
 292                     // fallback
 293                     this.indentedTreeImagePainter.setBaseCellPainter(cellPainter);
 294                     cellPainter = new BackgroundPainter(this.indentedTreeImagePainter);
 295                 }
 296             } else {
 297                 // backwards compatibility fallback
 298                 this.indentedTreeImagePainter.setBaseCellPainter(cellPainter);
 299                 cellPainter = new BackgroundPainter(this.indentedTreeImagePainter);
 300             }
 301         }
 302
 303         return cellPainter;
 304     }
 305
 306     @Override
 307     public boolean isRowIndexHidden(int rowIndex) {
 308         return this.hiddenRowIndexes.contains(rowIndex)
 309                 || isHiddenInUnderlyingLayer(rowIndex);
 310     }
 311
 312     @Override
 313     public Collection<Integer> getHiddenRowIndexes() {
 314         return this.hiddenRowIndexes;
 315     }
 316
 317     /**
 318      * Performs an expand/collapse action dependent on the current state of the
 319      * tree node at the given row index.
 320      *
 321      * @param parentIndex
 322      *            The index of the row that shows the tree node for which the
 323      *            expand/collapse action should be performed.
 324      */
 325     public void expandOrCollapseIndex(int parentIndex) {
 326         if (this.treeRowModel.isCollapsed(parentIndex)) {
 327             expandTreeRow(parentIndex);
 328         } else {
 329             collapseTreeRow(parentIndex);
 330         }
 331     }
 332
 333     /**
 334      * Collapses the tree node for the given row index.
 335      *
 336      * @param parentIndex
 337      *            The index of the row that shows the node that should be
 338      *            collapsed
 339      */
 340     public void collapseTreeRow(int parentIndex) {
 341         List<Integer> rowIndexes = this.treeRowModel.collapse(parentIndex);
 342         List<Integer> rowPositions = new ArrayList<Integer>();
 343         for (Integer rowIndex : rowIndexes) {
 344             int rowPos = getRowPositionByIndex(rowIndex);
 345             // if the rowPos is negative, it is not visible because of hidden
 346             // state in an underlying layer
 347             if (rowPos >= 0) {
 348                 rowPositions.add(rowPos);
 349             }
 350         }
 351         this.hiddenRowIndexes.addAll(rowIndexes);
 352         invalidateCache();
 353         fireLayerEvent(new HideRowPositionsEvent(this, rowPositions));
 354     }
 355
 356     /**
 357      * Collapses all tree nodes in the tree.
 358      */
 359     public void collapseAll() {
 360         List<Integer> rowIndexes = this.treeRowModel.collapseAll();
 361         List<Integer> rowPositions = new ArrayList<Integer>();
 362         for (Integer rowIndex : rowIndexes) {
 363             int rowPos = getRowPositionByIndex(rowIndex);
 364             // if the rowPos is negative, it is not visible because of hidden
 365             // state in an underlying layer
 366             if (rowPos >= 0) {
 367                 rowPositions.add(rowPos);
 368             }
 369         }
 370         this.hiddenRowIndexes.addAll(rowIndexes);
 371         invalidateCache();
 372         fireLayerEvent(new HideRowPositionsEvent(this, rowPositions));
 373     }
 374
 375     /**
 376      * Expands the tree node for the given row index.
 377      *
 378      * @param parentIndex
 379      *            The index of the row that shows the node that should be
 380      *            expanded
 381      */
 382     public void expandTreeRow(int parentIndex) {
 383         List<Integer> rowIndexes = this.treeRowModel.expand(parentIndex);
 384         // Bug 432865: iterating and removing every single item is faster than
 385         // removeAll()
 386         for (final Integer expandedChildRowIndex : rowIndexes) {
 387             this.hiddenRowIndexes.remove(expandedChildRowIndex);
 388         }
 389         invalidateCache();
 390         fireLayerEvent(new ShowRowPositionsEvent(this, rowIndexes));
 391     }
 392
 393     /**
 394      * Expands the tree node for the given row index in the tree to a certain
 395      * level.
 396      *
 397      * @param parentIndex
 398      *            The index of the row that shows the node that should be
 399      *            expanded
 400      * @param level
 401      *            The level to which the tree node should be expanded.
 402      */
 403     public void expandTreeRowToLevel(int parentIndex, int level) {
 404         List<Integer> rowIndexes = this.treeRowModel.expandToLevel(parentIndex, level);
 405         // Bug 432865: iterating and removing every single item is faster than
 406         // removeAll()
 407         for (final Integer expandedChildRowIndex : rowIndexes) {
 408             this.hiddenRowIndexes.remove(expandedChildRowIndex);
 409         }
 410         invalidateCache();
 411         fireLayerEvent(new ShowRowPositionsEvent(this, rowIndexes));
 412     }
 413
 414     /**
 415      * Expands all tree nodes in the tree.
 416      */
 417     public void expandAll() {
 418         List<Integer> rowIndexes = this.treeRowModel.expandAll();
 419         this.hiddenRowIndexes.clear();
 420         invalidateCache();
 421         fireLayerEvent(new ShowRowPositionsEvent(this, rowIndexes));
 422     }
 423
 424     /**
 425      * Expands all tree nodes in the tree to a certain level.
 426      *
 427      * @param level
 428      *            The level to which the tree node should be expanded.
 429      */
 430     public void expandAllToLevel(int level) {
 431         List<Integer> rowIndexes = this.treeRowModel.expandToLevel(level);
 432         // Bug 432865: iterating and removing every single item is faster than
 433         // removeAll()
 434 //        for (final Integer expandedChildRowIndex : rowIndexes) {
 435 //            this.hiddenRowIndexes.remove(expandedChildRowIndex);
 436 //        }
 437         if (rowIndexes == null)
 438                 return;
 439         for (int i = rowIndexes.size()-1; i>=0; i--) {
 440                 this.hiddenRowIndexes.remove(rowIndexes.get(i));
 441         }
 442         invalidateCache();
 443         fireLayerEvent(new ShowRowPositionsEvent(this, rowIndexes));
 444     }
 445
 446     /**
 447      * Checks the underlying layer if the row is hidden by another layer.
 448      *
 449      * @param rowIndex
 450      *            The index of the row whose hidden state should be checked
 451      * @return <code>true</code> if the row at the given index is hidden in the
 452      *         underlying layer <code>false</code> if not.
 453      */
 454     private boolean isHiddenInUnderlyingLayer(int rowIndex) {
 455         IUniqueIndexLayer underlyingLayer = (IUniqueIndexLayer) getUnderlyingLayer();
 456         return (underlyingLayer.getRowPositionByIndex(rowIndex) == -1);
 457     }
 458
 459     @Override
 460     public boolean doCommand(ILayerCommand command) {
 461         // special command transformations are needed to hide also child nodes
 462         if (command instanceof RowHideCommand) {
 463             return handleRowHideCommand((RowHideCommand) command);
 464         } else if (command instanceof MultiRowHideCommand) {
 465             return handleMultiRowHideCommand((MultiRowHideCommand) command);
 466         }
 467         return super.doCommand(command);
 468     }
 469
 470     /**
 471      * Checks if the given command tries to hide a row that is a node that is
 472      * not collapsed and has children. In that case also the child rows need to
 473      * be hidden.
 474      *
 475      * @param command
 476      *            The {@link RowHideCommand} to process
 477      * @return <code>true</code> if the command has been handled,
 478      *         <code>false</code> otherwise
 479      */
 480     protected boolean handleRowHideCommand(RowHideCommand command) {
 481         // transform position to index
 482         if (command.convertToTargetLayer(this)) {
 483             int rowIndex = getRowIndexByPosition(command.getRowPosition());
 484             if (this.treeRowModel.hasChildren(rowIndex)
 485                     && !this.treeRowModel.isCollapsed(rowIndex)) {
 486                 List<Integer> childIndexes = this.treeRowModel.getChildIndexes(rowIndex);
 487                 int[] childPositions = new int[childIndexes.size() + 1];
 488                 childPositions[0] = command.getRowPosition();
 489                 for (int i = 1; i < childIndexes.size() + 1; i++) {
 490                     int childPos = getRowPositionByIndex(childIndexes.get(i - 1));
 491                     childPositions[i] = childPos;
 492                 }
 493                 return super.doCommand(new MultiRowHideCommand(this, childPositions));
 494             }
 495         }
 496         return super.doCommand(command);
 497     }
 498
 499     /**
 500      * Checks if the given command tries to hide rows that are nodes that are
 501      * not collapsed and have children. In that case also the child rows need to
 502      * be hidden.
 503      *
 504      * @param command
 505      *            The {@link MultiRowHideCommand} to process
 506      * @return <code>true</code> if the command has been handled,
 507      *         <code>false</code> otherwise
 508      */
 509     protected boolean handleMultiRowHideCommand(MultiRowHideCommand command) {
 510         // transform position to index
 511         if (command.convertToTargetLayer(this)) {
 512             List<Integer> rowPositionsToHide = new ArrayList<Integer>();
 513             for (Integer rowPos : command.getRowPositions()) {
 514                 rowPositionsToHide.add(rowPos);
 515                 int rowIndex = getRowIndexByPosition(rowPos);
 516                 if (this.treeRowModel.hasChildren(rowIndex)
 517                         && !this.treeRowModel.isCollapsed(rowIndex)) {
 518                     List<Integer> childIndexes = this.treeRowModel.getChildIndexes(rowIndex);
 519                     for (Integer childIndex : childIndexes) {
 520                         rowPositionsToHide.add(getRowPositionByIndex(childIndex));
 521                     }
 522                 }
 523             }
 524
 525             int[] childPositions = new int[rowPositionsToHide.size()];
 526             for (int i = 0; i < rowPositionsToHide.size(); i++) {
 527                 childPositions[i] = rowPositionsToHide.get(i);
 528             }
 529             return super.doCommand(new MultiRowHideCommand(this, childPositions));
 530         }
 531         return super.doCommand(command);
 532     }
 533
 534     /**
 535      * @return <code>true</code> if the column index is used to determine the
 536      *         tree column, <code>false</code> if the column position is used.
 537      *         Default is <code>false</code>.
 538      */
 539     public boolean isUseTreeColumnIndex() {
 540         return this.useTreeColumnIndex;
 541     }
 542
 543     /**
 544      * Configure whether (column index == 0) or (column position == 0) should be
 545      * performed to identify the tree column.
 546      *
 547      * @param useTreeColumnIndex
 548      *            <code>true</code> if the column index should be used to
 549      *            determine the tree column, <code>false</code> if the column
 550      *            position should be used.
 551      */
 552     public void setUseTreeColumnIndex(boolean useTreeColumnIndex) {
 553         this.useTreeColumnIndex = useTreeColumnIndex;
 554     }
 555
 556     /**
 557      * @since 1.4
 558      */
 559     @Override
 560     public Collection<String> getProvidedLabels() {
 561         Collection<String> result = super.getProvidedLabels();
 562
 563         result.add(TreeLayer.TREE_COLUMN_CELL);
 564         result.add(DefaultTreeLayerConfiguration.TREE_LEAF_CONFIG_TYPE);
 565         result.add(DefaultTreeLayerConfiguration.TREE_COLLAPSED_CONFIG_TYPE);
 566         result.add(DefaultTreeLayerConfiguration.TREE_EXPANDED_CONFIG_TYPE);
 567         // configure 5 levels to be configurable via CSS
 568         // if you need more you need to override this method
 569         result.add(DefaultTreeLayerConfiguration.TREE_DEPTH_CONFIG_TYPE + "0"); //$NON-NLS-1$
 570         result.add(DefaultTreeLayerConfiguration.TREE_DEPTH_CONFIG_TYPE + "1"); //$NON-NLS-1$
 571         result.add(DefaultTreeLayerConfiguration.TREE_DEPTH_CONFIG_TYPE + "2"); //$NON-NLS-1$
 572         result.add(DefaultTreeLayerConfiguration.TREE_DEPTH_CONFIG_TYPE + "3"); //$NON-NLS-1$
 573         result.add(DefaultTreeLayerConfiguration.TREE_DEPTH_CONFIG_TYPE + "4"); //$NON-NLS-1$
 574
 575         return result;
 576     }
 577 }