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

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2010 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.modeling.ui.diagramEditor;
  13
  14 import java.util.ArrayList;
  15 import java.util.Collection;
  16 import java.util.Collections;
  17 import java.util.Set;
  18
  19 import org.eclipse.jface.layout.GridDataFactory;
  20 import org.eclipse.jface.layout.GridLayoutFactory;
  21 import org.eclipse.jface.viewers.CellLabelProvider;
  22 import org.eclipse.jface.viewers.CheckStateChangedEvent;
  23 import org.eclipse.jface.viewers.CheckboxTreeViewer;
  24 import org.eclipse.jface.viewers.ICheckStateListener;
  25 import org.eclipse.jface.viewers.ICheckStateProvider;
  26 import org.eclipse.jface.viewers.ISelection;
  27 import org.eclipse.jface.viewers.ISelectionChangedListener;
  28 import org.eclipse.jface.viewers.ITreeContentProvider;
  29 import org.eclipse.jface.viewers.SelectionChangedEvent;
  30 import org.eclipse.jface.viewers.TreeViewer;
  31 import org.eclipse.jface.viewers.Viewer;
  32 import org.eclipse.jface.viewers.ViewerCell;
  33 import org.eclipse.swt.SWT;
  34 import org.eclipse.swt.custom.TreeEditor;
  35 import org.eclipse.swt.events.KeyAdapter;
  36 import org.eclipse.swt.events.KeyEvent;
  37 import org.eclipse.swt.events.SelectionEvent;
  38 import org.eclipse.swt.events.SelectionListener;
  39 import org.eclipse.swt.graphics.Color;
  40 import org.eclipse.swt.graphics.GC;
  41 import org.eclipse.swt.graphics.Point;
  42 import org.eclipse.swt.graphics.Rectangle;
  43 import org.eclipse.swt.widgets.Button;
  44 import org.eclipse.swt.widgets.Composite;
  45 import org.eclipse.swt.widgets.Control;
  46 import org.eclipse.swt.widgets.Event;
  47 import org.eclipse.swt.widgets.Listener;
  48 import org.eclipse.swt.widgets.Text;
  49 import org.eclipse.swt.widgets.Tree;
  50 import org.eclipse.swt.widgets.TreeColumn;
  51 import org.eclipse.swt.widgets.TreeItem;
  52 import org.eclipse.ui.part.Page;
  53 import org.simantics.diagram.layer.ILayersViewPage;
  54 import org.simantics.g2d.canvas.ICanvasContext;
  55 import org.simantics.g2d.diagram.DiagramHints;
  56 import org.simantics.g2d.diagram.IDiagram;
  57 import org.simantics.g2d.diagram.participant.Selection;
  58 import org.simantics.g2d.element.ElementClass;
  59 import org.simantics.g2d.element.IElement;
  60 import org.simantics.g2d.element.handler.ElementLayers;
  61 import org.simantics.g2d.layers.IEditableLayer;
  62 import org.simantics.g2d.layers.ILayer;
  63 import org.simantics.g2d.layers.ILayers;
  64 import org.simantics.g2d.layers.ILayersEditor;
  65 import org.simantics.g2d.layers.SimpleLayer;
  66 import org.simantics.g2d.layers.ILayersEditor.ILayersEditorListener;
  67 import org.simantics.utils.datastructures.Arrays;
  68 import org.simantics.utils.datastructures.hints.HintListenerAdapter;
  69 import org.simantics.utils.datastructures.hints.IHintListener;
  70 import org.simantics.utils.datastructures.hints.IHintObservable;
  71 import org.simantics.utils.datastructures.hints.IHintContext.Key;
  72 import org.simantics.utils.ui.ISelectionUtils;
  73
  74 public class DiagramLayersPage extends Page implements ILayersViewPage {
  75
  76     private static final String TEXT_APPLY_FOCUS_SETTINGS = Messages.DiagramLayersPage_FocusActive;
  77     private static final String TOOLTIP_APPLY_FOCUS_SETTINGS = Messages.DiagramLayersPage_FocusActiveTT;
  78     private static final String TEXT_IGNORE_FOCUS_SETTINGS = Messages.DiagramLayersPage_FocusAll;
  79     private static final String TOOLTIP_IGNORE_FOCUS_SETTINGS = Messages.DiagramLayersPage_FocusAllTT;
  80
  81     private static final String TEXT_APPLY_VISIBILITY_SETTINGS = Messages.DiagramLayersPage_ShowActive;
  82     private static final String TOOLTIP_APPLY_VISIBILITY_SETTINGS = Messages.DiagramLayersPage_ShowActiveTT;
  83     private static final String TEXT_IGNORE_VISIBILITY_SETTINGS = Messages.DiagramLayersPage_ShowAll;
  84     private static final String TOOLTIP_IGNORE_VISIBILITY_SETTINGS = Messages.DiagramLayersPage_ShowAllTT;
  85
  86     final private ICanvasContext context;
  87     final private IDiagram diagram;
  88     private CheckboxTreeViewer viewer;
  89     private Composite composite;
  90     private TreeEditor editor;
  91
  92     private Collection<IElement> elements = Collections.emptySet();
  93
  94     enum Attribute {
  95         Visible,
  96         Focusable
  97     }
  98
  99     enum Tristate {
 100         True,
 101         False,
 102         Both;
 103
 104         static Tristate to(Boolean b) {
 105             return b == null ? null : b ? True : False;
 106         }
 107         boolean toBoolean() {
 108             switch (this) {
 109                 case Both:
 110                     throw new IllegalStateException("cannot convert Tristate Both to boolean"); //$NON-NLS-1$
 111                 case False:
 112                     return false;
 113                 case True:
 114                     return true;
 115                 default:
 116                     return false;
 117             }
 118         }
 119         Tristate toggle() {
 120             switch (this) {
 121                 case Both:
 122                 case False:
 123                     return True;
 124                 case True:
 125                     return False;
 126                 default:
 127                     return False;
 128             }
 129         }
 130         Tristate merge(Tristate state) {
 131             if (state == null)
 132                 return this;
 133             switch (this) {
 134                 case Both:
 135                     return Both;
 136                 case False:
 137                     switch (state) {
 138                         case False:
 139                             return False;
 140                         case Both:
 141                         case True:
 142                             return Both;
 143                     }
 144                 case True:
 145                     switch (state) {
 146                         case True:
 147                             return True;
 148                         case False:
 149                         case Both:
 150                             return Both;
 151                     }
 152             }
 153             return this;
 154         }
 155     }
 156
 157     Boolean getAttribute(IElement e, ILayer layer, Attribute attribute) {
 158         ElementClass ec = e.getElementClass();
 159         for (ElementLayers el : ec.getItemsByClass(ElementLayers.class)) {
 160             switch (attribute) {
 161                 case Visible:
 162                     return Boolean.valueOf(el.isVisible(e, layer));
 163                 case Focusable:
 164                     return Boolean.valueOf(el.isFocusable(e, layer));
 165             }
 166         }
 167         return null;
 168     }
 169
 170     boolean setAttribute(IElement e, ILayer layer, Attribute attribute, boolean value) {
 171         ElementClass ec = e.getElementClass();
 172         for (ElementLayers el : ec.getItemsByClass(ElementLayers.class)) {
 173             switch (attribute) {
 174                 case Visible:
 175                     return el.setVisibility(e, layer, value);
 176                 case Focusable:
 177                     return el.setFocusability(e, layer, value);
 178             }
 179         }
 180         return false;
 181     }
 182
 183     Tristate getJointAttribute(Collection<IElement> elements, ILayer layer, Attribute attribute) {
 184         Tristate state = null;
 185         for (IElement e : elements) {
 186             Boolean attr = getAttribute(e, layer, attribute);
 187             if (attr == null)
 188                 continue;
 189
 190             if (state == null) {
 191                 state = Tristate.to(attr);
 192             } else {
 193                 state = state.merge(Tristate.to(attr));
 194             }
 195         }
 196         return state;
 197     }
 198
 199     int setAttribute(Collection<IElement> elements, ILayer layer, Attribute attribute, boolean value) {
 200         int result = 0;
 201         for (IElement e : elements) {
 202             if (setAttribute(e, layer, attribute, value))
 203                 ++result;
 204         }
 205         return result;
 206     }
 207
 208
 209     final private IHintListener selectionListener = new HintListenerAdapter() {
 210
 211         @Override
 212         public void hintChanged(IHintObservable sender, Key key, Object oldValue, Object newValue) {
 213             Collection<IElement> es = Collections.emptySet();
 214             if (newValue instanceof Collection<?>) {
 215                 Collection<?> coll = (Collection<?>)newValue;
 216                 es = new ArrayList<IElement>(coll.size());
 217                 for (Object o : coll) {
 218                     if (!(o instanceof IElement))
 219                         return;
 220                     es.add((IElement) o);
 221                 }
 222                 if (es.isEmpty())
 223                     es = Collections.emptySet();
 224             }
 225             elements = es;
 226             redraw();
 227         }
 228
 229         private void redraw() {
 230             viewer.getControl().getDisplay().asyncExec(new Runnable() {
 231                 @Override
 232                 public void run() {
 233                     if (viewer.getControl().isDisposed())
 234                         return;
 235                     viewer.getControl().redraw();
 236                 }
 237             });
 238         }
 239     };
 240
 241     public DiagramLayersPage(IDiagram diagram, ICanvasContext context) {
 242
 243         assert(diagram != null);
 244
 245         this.diagram = diagram;
 246         this.context = context;
 247
 248         context.getDefaultHintContext().addKeyHintListener(Selection.SELECTION0, selectionListener);
 249     }
 250
 251     @Override
 252     public void dispose() {
 253
 254         context.getDefaultHintContext().removeKeyHintListener(Selection.SELECTION0, selectionListener);
 255
 256         super.dispose();
 257
 258     }
 259
 260     @Override
 261     public void createControl(Composite parent) {
 262
 263         final ILayersEditor layers = diagram.getHint(DiagramHints.KEY_LAYERS_EDITOR);
 264         layers.addListener(new ILayersEditorListener() {
 265
 266             @Override
 267             public void layerRemoved(ILayer layer) {
 268                 scheduleRefresh();
 269             }
 270
 271             @Override
 272             public void layerAdded(ILayer layer) {
 273                 scheduleRefresh();
 274             }
 275
 276             @Override
 277             public void layerActivated(ILayer layer) {
 278                 scheduleRefresh();
 279             }
 280
 281             @Override
 282             public void layerDeactivated(ILayer layer) {
 283                 scheduleRefresh();
 284             }
 285
 286             @Override
 287             public void ignoreFocusChanged(boolean value) {
 288             }
 289
 290             @Override
 291             public void ignoreVisibilityChanged(boolean value) {
 292             }
 293
 294             void scheduleRefresh() {
 295                 viewer.getControl().getDisplay().asyncExec(new Runnable() {
 296                     @Override
 297                     public void run() {
 298                         viewer.refresh();
 299                     }
 300                 });
 301             }
 302         });
 303
 304         composite = new Composite(parent, SWT.NONE);
 305         GridLayoutFactory.fillDefaults().numColumns(4).applyTo(composite);
 306
 307         Button addButton = new Button(composite, SWT.NONE);
 308         addButton.setText(Messages.DiagramLayersPage_New);
 309         addButton.setToolTipText(Messages.DiagramLayersPage_NewTT);
 310         addButton.addSelectionListener(new SelectionListener() {
 311
 312             String findFreshName(ILayers layers, String proposal) {
 313                 Set<ILayer> all = layers.getLayers();
 314                 String name = proposal;
 315                 int i = 1;
 316                 while (true) {
 317                     boolean match = false;
 318                     for (ILayer layer : all) {
 319                         if (name.equals(layer.getName())) {
 320                             match = true;
 321                             break;
 322                         }
 323                     }
 324                     if (!match)
 325                         return name;
 326                     ++i;
 327                     name = proposal + " " + i; //$NON-NLS-1$
 328                 }
 329             }
 330
 331             @Override
 332             public void widgetSelected(SelectionEvent e) {
 333                 String name = findFreshName(layers, Messages.DiagramLayersPage_NewRole);
 334                 SimpleLayer layer = new SimpleLayer(name);
 335                 layers.addLayer(layer);
 336                 layers.activate(layer);
 337             }
 338
 339             @Override
 340             public void widgetDefaultSelected(SelectionEvent e) {
 341                 widgetSelected(e);
 342             }
 343
 344         });
 345
 346         final Button removeButton = new Button(composite, SWT.NONE);
 347         removeButton.setText(Messages.DiagramLayersPage_Remove);
 348         removeButton.setToolTipText(Messages.DiagramLayersPage_RemoveTT);
 349         removeButton.addSelectionListener(new SelectionListener() {
 350             @Override
 351             public void widgetSelected(SelectionEvent e) {
 352                 TreeItem[] items = viewer.getTree().getSelection();
 353                 if (items.length == 0)
 354                     return;
 355
 356                 TreeItem[] all = viewer.getTree().getItems();
 357                 int firstIndex = Arrays.indexOf(all, items[0]);
 358                 for (TreeItem item : items) {
 359                     int index = Arrays.indexOf(all, item);
 360                     all[index] = null;
 361                     ILayer layer = (ILayer)item.getData();
 362                     layers.removeLayer(layer);
 363                 }
 364                 int selectIndex = firstIndex - 1;
 365                 if (firstIndex == 0) {
 366                     for (int i = firstIndex; i < all.length; ++i)
 367                         if (all[i] != null) {
 368                             selectIndex = i;
 369                             break;
 370                         }
 371                 }
 372                 if (selectIndex >= 0) {
 373                     viewer.getTree().select(all[selectIndex]);
 374                 }
 375             }
 376
 377             @Override
 378             public void widgetDefaultSelected(SelectionEvent e) {
 379                 widgetSelected(e);
 380             }
 381         });
 382
 383         String ignoreVisibilityText = TEXT_IGNORE_VISIBILITY_SETTINGS;
 384         String ignoreVisibilityTooltip = TOOLTIP_IGNORE_VISIBILITY_SETTINGS;
 385         boolean ignoreVisibility = layers.getIgnoreVisibilitySettings();
 386         if (ignoreVisibility) {
 387             ignoreVisibilityText = TEXT_APPLY_VISIBILITY_SETTINGS;
 388             ignoreVisibilityTooltip = TOOLTIP_APPLY_VISIBILITY_SETTINGS;
 389         }
 390
 391         final Button ignoreVisibilityButton = new Button(composite, SWT.NONE);
 392         ignoreVisibilityButton.setText(ignoreVisibilityText);
 393         ignoreVisibilityButton.setToolTipText(ignoreVisibilityTooltip);
 394         ignoreVisibilityButton.addSelectionListener(new SelectionListener() {
 395
 396             @Override
 397             public void widgetSelected(SelectionEvent e) {
 398                 String ignoreText = TEXT_IGNORE_VISIBILITY_SETTINGS;
 399                 String ignoreTooltip= TOOLTIP_IGNORE_VISIBILITY_SETTINGS;
 400                 boolean ignore = layers.getIgnoreVisibilitySettings();
 401                 if(!ignore) {
 402                     ignoreText = TEXT_APPLY_VISIBILITY_SETTINGS;
 403                     ignoreTooltip = TOOLTIP_APPLY_VISIBILITY_SETTINGS;
 404                     layers.setIgnoreVisibilitySettings(true);
 405                 } else {
 406                     layers.setIgnoreVisibilitySettings(false);
 407                 }
 408                 ignoreVisibilityButton.setText(ignoreText);
 409                 ignoreVisibilityButton.setToolTipText(ignoreTooltip);
 410                 composite.layout();
 411                 context.getThreadAccess().asyncExec(new Runnable() {
 412
 413                     @Override
 414                     public void run() {
 415                         if(context.isDisposed()) return;
 416                         context.getContentContext().setDirty();
 417                     }
 418
 419                 });
 420             }
 421
 422             @Override
 423             public void widgetDefaultSelected(SelectionEvent e) {
 424                 widgetSelected(e);
 425             }
 426
 427         });
 428
 429         String ignoreFocusText = TEXT_IGNORE_FOCUS_SETTINGS;
 430         String ignoreFocusTooltip = TOOLTIP_IGNORE_FOCUS_SETTINGS;
 431         boolean ignoreFocus = layers.getIgnoreFocusSettings();
 432         if(ignoreFocus) {
 433             ignoreFocusText = TEXT_APPLY_FOCUS_SETTINGS;
 434             ignoreFocusTooltip = TOOLTIP_APPLY_FOCUS_SETTINGS;
 435         }
 436
 437         final Button ignoreFocusButton = new Button(composite, SWT.NONE);
 438         ignoreFocusButton.setText(ignoreFocusText);
 439         ignoreFocusButton.setToolTipText(ignoreFocusTooltip);
 440         ignoreFocusButton.addSelectionListener(new SelectionListener() {
 441
 442             @Override
 443             public void widgetSelected(SelectionEvent e) {
 444                 String ignoreText = TEXT_IGNORE_FOCUS_SETTINGS;
 445                 String ignoreTooltip = TOOLTIP_IGNORE_FOCUS_SETTINGS;
 446                 boolean ignore = layers.getIgnoreFocusSettings();
 447                 if(!ignore) {
 448                     ignoreText = TEXT_APPLY_FOCUS_SETTINGS;
 449                     ignoreTooltip = TOOLTIP_APPLY_FOCUS_SETTINGS;
 450                     layers.setIgnoreFocusSettings(true);
 451                 } else {
 452                     layers.setIgnoreFocusSettings(false);
 453                 }
 454                 ignoreFocusButton.setText(ignoreText);
 455                 ignoreFocusButton.setToolTipText(ignoreTooltip);
 456                 composite.layout();
 457                 context.getThreadAccess().asyncExec(new Runnable() {
 458
 459                     @Override
 460                     public void run() {
 461                         if(context.isDisposed()) return;
 462                         context.getContentContext().setDirty();
 463                     }
 464
 465                 });
 466             }
 467
 468             @Override
 469             public void widgetDefaultSelected(SelectionEvent e) {
 470                 widgetSelected(e);
 471             }
 472
 473         });
 474
 475         viewer = new CheckboxTreeViewer(composite, SWT.BORDER | SWT.FULL_SELECTION );
 476
 477         GridDataFactory.fillDefaults().grab(true, true).span(4, 1).applyTo(viewer.getControl());
 478         viewer.getControl().setToolTipText(Messages.DiagramLayersPage_SelectTT);
 479         viewer.setAutoExpandLevel(TreeViewer.ALL_LEVELS);
 480         viewer.getTree().setHeaderVisible(true);
 481         editor = new TreeEditor(viewer.getTree());
 482
 483         final TreeColumn column1 = new TreeColumn(viewer.getTree(), SWT.LEFT);
 484         column1.setText(Messages.DiagramLayersPage_Role);
 485         column1.setWidth(100);
 486         final TreeColumn column2 = new TreeColumn(viewer.getTree(), SWT.LEFT);
 487         column2.setText(Messages.DiagramLayersPage_Show);
 488         column2.setWidth(50);
 489         final TreeColumn column3 = new TreeColumn(viewer.getTree(), SWT.LEFT);
 490         column3.setText(Messages.DiagramLayersPage_Focus);
 491         column3.setWidth(50);
 492         viewer.getTree().addListener(SWT.Resize, new Listener() {
 493             @Override
 494             public void handleEvent(Event event) {
 495                 Tree tree = viewer.getTree();
 496                 Point size = tree.getSize();
 497                 int w = Math.max(size.x - 100 - tree.getBorderWidth() * 2, 30);
 498                 column1.setWidth(w);
 499             }
 500         });
 501
 502         viewer.getTree().addListener(SWT.PaintItem, new Listener() {
 503             public void handleEvent(Event event) {
 504                 if ((event.index == 1 || event.index == 2) && !elements.isEmpty()) {
 505                     ILayer[] lz = layers.getLayers().toArray(new ILayer[0]);
 506
 507                     TreeItem item = (TreeItem)event.item;
 508                     int index = viewer.getTree().indexOf(item);
 509
 510                     int width = 0;
 511                     if (event.index == 1)
 512                         width = (column2.getWidth() - 1);
 513                     if (event.index == 2)
 514                         width = (column3.getWidth() - 1);
 515
 516                     Attribute attribute = Attribute.Visible;
 517                     if (event.index == 2)
 518                         attribute = Attribute.Focusable;
 519                     Tristate state = getJointAttribute(elements, lz[index], attribute);
 520
 521                     Color color = null;
 522                     switch (state) {
 523                         case False:
 524                             color = viewer.getTree().getDisplay().getSystemColor(SWT.COLOR_RED);
 525                             break;
 526                         case True:
 527                             color = viewer.getTree().getDisplay().getSystemColor(SWT.COLOR_GREEN);
 528                             break;
 529                         case Both:
 530                             color = viewer.getTree().getDisplay().getSystemColor(SWT.COLOR_GRAY);
 531                             break;
 532                     }
 533
 534                     GC gc = event.gc;
 535                     Color foreground = gc.getForeground();
 536                     Color background = gc.getBackground();
 537                     gc.setBackground(color);
 538                     gc.setForeground(viewer.getTree().getDisplay().getSystemColor(SWT.COLOR_BLACK));
 539                     gc.fillRectangle(event.x, event.y, width-1, event.height-1);
 540                     Rectangle rect2 = new Rectangle(event.x, event.y, width-1, event.height-1);
 541                     gc.drawRectangle(rect2);
 542                     gc.setForeground(background);
 543                     gc.setBackground(foreground);
 544                 }
 545             }
 546         });
 547         viewer.getTree().addKeyListener(new KeyAdapter() {
 548             @Override
 549             public void keyPressed(KeyEvent event) {
 550                 if (event.keyCode == SWT.F2) {
 551                     // FIXME: Eclipse currently eats F2 presses. This should be
 552                     // implemented as a command handler or find some way to
 553                     // force these listeners to have priority...
 554                     System.out.println("startediting"); //$NON-NLS-1$
 555
 556                     TreeItem[] items = viewer.getTree().getSelection();
 557                     if(items.length != 1)
 558                         return;
 559
 560                     TreeItem item = items[0];
 561
 562                     ILayer layer = ISelectionUtils.filterSingleSelection(viewer.getSelection(), ILayer.class);
 563                     if (layer == null)
 564                         return;
 565
 566                     startEditing(layer, item);
 567                 }
 568             }
 569         });
 570         viewer.getTree().addListener(SWT.MouseDown, new Listener() {
 571             public void handleEvent(Event event) {
 572                 if (viewer.getControl().isDisposed())
 573                     return;
 574
 575                 Point pt = new Point(event.x, event.y);
 576                 TreeItem item = viewer.getTree().getItem(pt);
 577                 if (item == null)
 578                     return;
 579
 580                 int index = viewer.getTree().indexOf(item);
 581                 ILayer[] lz = layers.getLayers().toArray(new ILayer[0]);
 582                 ILayer layer = lz[index];
 583
 584                 Rectangle rect = item.getBounds(0);
 585                 if (event.count == 2 && rect.contains(pt)) {
 586                     startEditing(layer, item);
 587                     return;
 588                 }
 589
 590                 // Cannot adjust visibility/focusability if no elements are selected.
 591                 if (elements.isEmpty())
 592                     return;
 593
 594                 rect = item.getBounds(1);
 595                 if (rect.contains(pt)) {
 596                     Tristate state = getJointAttribute(elements, layer, Attribute.Visible);
 597                     if (setAttribute(elements, layer, Attribute.Visible, state.toggle().toBoolean()) > 0) {
 598                         refresh();
 599                     }
 600                     return;
 601                 }
 602
 603                 Rectangle rect2 = item.getBounds(2);
 604                 if (rect2.contains(pt)) {
 605                     Tristate state = getJointAttribute(elements, layer, Attribute.Focusable);
 606                     if (setAttribute(elements, layer, Attribute.Focusable, state.toggle().toBoolean()) > 0) {
 607                         refresh();
 608                     }
 609                     return;
 610                 }
 611             }
 612
 613             private void refresh() {
 614                 viewer.getControl().redraw();
 615                 context.getThreadAccess().asyncExec(new Runnable() {
 616                     @Override
 617                     public void run() {
 618                         if (context.isDisposed())
 619                             return;
 620                         context.getContentContext().setDirty();
 621                     }
 622                 });
 623             }
 624         });
 625
 626         viewer.addCheckStateListener(new ICheckStateListener(){
 627             @Override
 628             public void checkStateChanged(CheckStateChangedEvent event) {
 629                 ILayer layer = (ILayer)event.getElement();
 630                 if(event.getChecked()) layers.activate(layer);
 631                 else layers.deactivate(layer);
 632                 viewer.setSubtreeChecked(event.getElement(), event.getChecked());
 633                 context.getThreadAccess().asyncExec(new Runnable() {
 634
 635                     @Override
 636                     public void run() {
 637                         if(context.isDisposed()) return;
 638                         context.getContentContext().setDirty();
 639                     }
 640
 641                 });
 642             }
 643         });
 644
 645         viewer.addSelectionChangedListener(new ISelectionChangedListener() {
 646             @Override
 647             public void selectionChanged(SelectionChangedEvent event) {
 648                 ISelection s = event.getSelection();
 649                 if (s.isEmpty()) {
 650                     removeButton.setEnabled(false);
 651                 } else {
 652                     removeButton.setEnabled(true);
 653                 }
 654             }
 655         });
 656
 657         viewer.setContentProvider(new ITreeContentProvider(){
 658             @Override
 659             public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
 660             }
 661             @Override
 662             public void dispose() {
 663             }
 664             @Override
 665             public Object[] getElements(Object inputElement) {
 666                 return layers.getLayers().toArray();
 667             }
 668             @Override
 669             public boolean hasChildren(Object element) {
 670                 return false;
 671             }
 672             @Override
 673             public Object getParent(Object element) {
 674                 return null;
 675             }
 676             @Override
 677             public Object[] getChildren(Object parentElement) {
 678                 return new Object[0];
 679             }
 680         });
 681         viewer.setLabelProvider(new CellLabelProvider() {
 682             @Override
 683             public void update(ViewerCell cell) {
 684                 if(cell.getColumnIndex() == 0) {
 685                     ILayer layer  = (ILayer)cell.getElement();
 686                     cell.setText(layer.getName());
 687                 } else {
 688                     cell.setText(""); //$NON-NLS-1$
 689                 }
 690             }
 691         });
 692         viewer.setCheckStateProvider(new ICheckStateProvider() {
 693             @Override
 694             public boolean isChecked(Object element) {
 695                 ILayer layer  = (ILayer)element;
 696                 final boolean isActive = layers.isActive(layer);
 697                 return isActive;
 698             }
 699             @Override
 700             public boolean isGrayed(Object element) {
 701                 return false;
 702             }
 703         });
 704
 705         viewer.setInput(this);
 706
 707         for(ILayer layer : layers.getVisibleLayers()) {
 708             viewer.setSubtreeChecked(layer, true);
 709         }
 710     }
 711
 712     @Override
 713     public Control getControl() {
 714         return composite;
 715     }
 716
 717     @Override
 718     public void setFocus() {
 719     }
 720
 721     @Override
 722     public void addSelectionChangedListener(ISelectionChangedListener listener) {
 723     }
 724
 725     @Override
 726     public ISelection getSelection() {
 727         return null;
 728     }
 729
 730     @Override
 731     public void removeSelectionChangedListener(ISelectionChangedListener listener) {
 732     }
 733
 734     @Override
 735     public void setSelection(ISelection selection) {
 736     }
 737
 738     private boolean startEditing(final ILayer layer, final TreeItem item/*, final int columnIndex*/) {
 739
 740         //        Column column = columns[columnIndex];
 741
 742         String initialText = layer.getName();
 743
 744         final Composite composite = new Composite(viewer.getTree(), SWT.NONE);
 745         final Text text = new Text(composite, SWT.BORDER);
 746         final int insetX = 0;
 747         final int insetY = 0;
 748         composite.addListener(SWT.Resize, new Listener() {
 749             public void handleEvent(Event e) {
 750                 Rectangle rect = composite.getClientArea();
 751                 text.setBounds(rect.x + insetX, rect.y + insetY, rect.width - insetX * 2, rect.height
 752                         - insetY * 2);
 753             }
 754         });
 755         Listener textListener = new Listener() {
 756             public void handleEvent(final Event e) {
 757                 //String error;
 758                 String newText;
 759                 switch (e.type) {
 760                     case SWT.FocusOut:
 761                         if(layer instanceof IEditableLayer) {
 762                             IEditableLayer l = (IEditableLayer)layer;
 763                             l.setName(text.getText());
 764                             System.out.println("renamed layer to " + text.getText()); //$NON-NLS-1$
 765                             viewer.refresh();
 766                         }
 767
 768                         //                                      // Item may be disposed if the tree gets reset after a previous editing.
 769                         //                                      if (!item.isDisposed()) {
 770                         //                                              item.setText(columnIndex, text.getText());
 771                         //                                              queueSelectionRefresh(context);
 772                         //                                      }
 773                         //                              } else {
 774                         //                                      //                                System.out.println("validation error: " + error);
 775                         //                              }
 776                         composite.dispose();
 777                         break;
 778                     case SWT.Modify:
 779                         //                              newText = text.getText();
 780                         //                              error = modifier.isValid(newText);
 781                         //                              if (error != null) {
 782                         //                                      text.setBackground(invalidModificationColor);
 783                         //                                      //                                System.out.println("validation error: " + error);
 784                         //                              } else {
 785                         //                                      text.setBackground(null);
 786                         //                              }
 787                         break;
 788                     case SWT.Verify:
 789                         newText = text.getText();
 790                         String leftText = newText.substring(0, e.start);
 791                         String rightText = newText.substring(e.end, newText.length());
 792                         GC gc = new GC(text);
 793                         Point size = gc.textExtent(leftText + e.text + rightText);
 794                         gc.dispose();
 795                         size = text.computeSize(size.x, SWT.DEFAULT);
 796                         editor.horizontalAlignment = SWT.LEFT;
 797                         Rectangle itemRect = item.getBounds(0),
 798                         rect = viewer.getTree().getClientArea();
 799                         editor.minimumWidth = Math.max(size.x, itemRect.width) + insetX * 2;
 800                         int left = itemRect.x,
 801                         right = rect.x + rect.width;
 802                         editor.minimumWidth = Math.min(editor.minimumWidth, right - left);
 803                         editor.minimumHeight = size.y + insetY * 2;
 804                         editor.layout();
 805                         break;
 806                     case SWT.Traverse:
 807                         switch (e.detail) {
 808                             case SWT.TRAVERSE_RETURN:
 809                                 if(layer instanceof IEditableLayer) {
 810                                     IEditableLayer l = (IEditableLayer)layer;
 811                                     l.setName(text.getText());
 812                                     //System.out.println("renamed layer to " + text.getText());
 813                                     viewer.refresh();
 814                                 }
 815                                 //                                      error = modifier.isValid(text.getText());
 816                                 //                                      if (error == null) {
 817                                 //                                              modifier.modify(text.getText());
 818                                 //                                              if (!item.isDisposed()) {
 819                                 //                                                      item.setText(columnIndex, text.getText());
 820                                 //                                                      queueSelectionRefresh(context);
 821                                 //                                              }
 822                                 //                                      }
 823                                 // FALL THROUGH
 824                             case SWT.TRAVERSE_ESCAPE:
 825                                 composite.dispose();
 826                                 e.doit = false;
 827                                 break;
 828                             default:
 829                                 //System.out.println("unhandled traversal: " + e.detail);
 830                                 break;
 831                         }
 832                         break;
 833                 }
 834             }
 835         };
 836         text.addListener(SWT.FocusOut, textListener);
 837         text.addListener(SWT.Traverse, textListener);
 838         text.addListener(SWT.Verify, textListener);
 839         text.addListener(SWT.Modify, textListener);
 840         editor.setEditor(composite, item, 0);
 841         text.setText(initialText);
 842         text.selectAll();
 843         text.setFocus();
 844         //        lastItem[0] = item;
 845         return true;
 846     }
 847
 848 }