net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/wizards/dialogfields/ListDialogField.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2003 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 package net.sourceforge.phpdt.internal.ui.wizards.dialogfields;
  12
  13
  14 import java.util.ArrayList;
  15 import java.util.Iterator;
  16 import java.util.List;
  17
  18 import net.sourceforge.phpdt.internal.ui.util.PixelConverter;
  19 import net.sourceforge.phpdt.internal.ui.util.SWTUtil;
  20 import net.sourceforge.phpdt.internal.ui.util.TableLayoutComposite;
  21
  22 import org.eclipse.jface.util.Assert;
  23 import org.eclipse.jface.viewers.ColumnLayoutData;
  24 import org.eclipse.jface.viewers.ColumnWeightData;
  25 import org.eclipse.jface.viewers.DoubleClickEvent;
  26 import org.eclipse.jface.viewers.IDoubleClickListener;
  27 import org.eclipse.jface.viewers.ILabelProvider;
  28 import org.eclipse.jface.viewers.ISelection;
  29 import org.eclipse.jface.viewers.ISelectionChangedListener;
  30 import org.eclipse.jface.viewers.IStructuredContentProvider;
  31 import org.eclipse.jface.viewers.IStructuredSelection;
  32 import org.eclipse.jface.viewers.SelectionChangedEvent;
  33 import org.eclipse.jface.viewers.StructuredSelection;
  34 import org.eclipse.jface.viewers.TableLayout;
  35 import org.eclipse.jface.viewers.TableViewer;
  36 import org.eclipse.jface.viewers.Viewer;
  37 import org.eclipse.jface.viewers.ViewerSorter;
  38 import org.eclipse.swt.SWT;
  39 import org.eclipse.swt.events.KeyAdapter;
  40 import org.eclipse.swt.events.KeyEvent;
  41 import org.eclipse.swt.events.SelectionEvent;
  42 import org.eclipse.swt.events.SelectionListener;
  43 import org.eclipse.swt.layout.GridData;
  44 import org.eclipse.swt.layout.GridLayout;
  45 import org.eclipse.swt.widgets.Button;
  46 import org.eclipse.swt.widgets.Composite;
  47 import org.eclipse.swt.widgets.Control;
  48 import org.eclipse.swt.widgets.Display;
  49 import org.eclipse.swt.widgets.Label;
  50 import org.eclipse.swt.widgets.Table;
  51 import org.eclipse.swt.widgets.TableColumn;
  52
  53 /**
  54  * A list with a button bar.
  55  * Typical buttons are 'Add', 'Remove', 'Up' and 'Down'.
  56  * List model is independend of widget creation.
  57  * DialogFields controls are: Label, List and Composite containing buttons.
  58  */
  59 public class ListDialogField extends DialogField {
  60
  61         public static class ColumnsDescription {
  62                 private ColumnLayoutData[] columns;
  63                 private String[] headers;
  64                 private boolean drawLines;
  65
  66                 public ColumnsDescription(ColumnLayoutData[] columns, String[] headers, boolean drawLines) {
  67                         this.columns= columns;
  68                         this.headers= headers;
  69                         this.drawLines= drawLines;
  70                 }
  71
  72                 public ColumnsDescription(String[] headers, boolean drawLines) {
  73                         this(createColumnWeightData(headers.length), headers, drawLines);
  74                 }
  75
  76                 public ColumnsDescription(int nColumns, boolean drawLines) {
  77                         this(createColumnWeightData(nColumns), null, drawLines);
  78                 }
  79
  80                 private static ColumnLayoutData[] createColumnWeightData(int nColumns) {
  81                         ColumnLayoutData[] data= new ColumnLayoutData[nColumns];
  82                         for (int i= 0; i < nColumns; i++) {
  83                                 data[i]= new ColumnWeightData(1);
  84                         }
  85                         return data;
  86                 }
  87         }
  88
  89         protected TableViewer fTable;
  90         protected ILabelProvider fLabelProvider;
  91         protected ListViewerAdapter fListViewerAdapter;
  92         protected List fElements;
  93         protected ViewerSorter fViewerSorter;
  94
  95         protected String[] fButtonLabels;
  96         private Button[] fButtonControls;
  97
  98         private boolean[] fButtonsEnabled;
  99
 100         private int fRemoveButtonIndex;
 101         private int fUpButtonIndex;
 102         private int fDownButtonIndex;
 103
 104         private Label fLastSeparator;
 105
 106         private Control fTableControl;
 107         private Composite fButtonsControl;
 108         private ISelection fSelectionWhenEnabled;
 109
 110         private IListAdapter fListAdapter;
 111
 112         private Object fParentElement;
 113
 114         private ColumnsDescription fTableColumns;
 115
 116
 117         /**
 118          * Creates the <code>ListDialogField</code>.
 119          * @param adapter A listener for button invocation, selection changes. Can
 120          * be <code>null</code>.
 121          * @param buttonLabels The labels of all buttons: <code>null</code> is a valid array entry and
 122          * marks a separator.
 123          * @param lprovider The label provider to render the table entries
 124          */
 125         public ListDialogField(IListAdapter adapter, String[] buttonLabels, ILabelProvider lprovider) {
 126                 super();
 127                 fListAdapter= adapter;
 128
 129                 fLabelProvider= lprovider;
 130                 fListViewerAdapter= new ListViewerAdapter();
 131                 fParentElement= this;
 132
 133                 fElements= new ArrayList(10);
 134
 135                 fButtonLabels= buttonLabels;
 136                 if (fButtonLabels != null) {
 137                         int nButtons= fButtonLabels.length;
 138                         fButtonsEnabled= new boolean[nButtons];
 139                         for (int i= 0; i < nButtons; i++) {
 140                                 fButtonsEnabled[i]= true;
 141                         }
 142                 }
 143
 144                 fTable= null;
 145                 fTableControl= null;
 146                 fButtonsControl= null;
 147                 fTableColumns= null;
 148
 149                 fRemoveButtonIndex= -1;
 150                 fUpButtonIndex= -1;
 151                 fDownButtonIndex= -1;
 152         }
 153
 154         /**
 155          * Sets the index of the 'remove' button in the button label array passed in the constructor.
 156          * The behaviour of the button marked as the 'remove' button will then be handled internally.
 157          * (enable state, button invocation behaviour)
 158          */
 159         public void setRemoveButtonIndex(int removeButtonIndex) {
 160                 Assert.isTrue(removeButtonIndex < fButtonLabels.length);
 161                 fRemoveButtonIndex= removeButtonIndex;
 162         }
 163
 164         /**
 165          * Sets the index of the 'up' button in the button label array passed in the constructor.
 166          * The behaviour of the button marked as the 'up' button will then be handled internally.
 167          * (enable state, button invocation behaviour)
 168          */
 169         public void setUpButtonIndex(int upButtonIndex) {
 170                 Assert.isTrue(upButtonIndex < fButtonLabels.length);
 171                 fUpButtonIndex= upButtonIndex;
 172         }
 173
 174         /**
 175          * Sets the index of the 'down' button in the button label array passed in the constructor.
 176          * The behaviour of the button marked as the 'down' button will then be handled internally.
 177          * (enable state, button invocation behaviour)
 178          */
 179         public void setDownButtonIndex(int downButtonIndex) {
 180                 Assert.isTrue(downButtonIndex < fButtonLabels.length);
 181                 fDownButtonIndex= downButtonIndex;
 182         }
 183
 184         /**
 185          * Sets the viewerSorter.
 186          * @param viewerSorter The viewerSorter to set
 187          */
 188         public void setViewerSorter(ViewerSorter viewerSorter) {
 189                 fViewerSorter= viewerSorter;
 190         }
 191
 192         public void setTableColumns(ColumnsDescription column) {
 193                 fTableColumns= column;
 194         }
 195
 196
 197
 198         // ------ adapter communication
 199
 200         private void buttonPressed(int index) {
 201                 if (!managedButtonPressed(index) && fListAdapter != null) {
 202                         fListAdapter.customButtonPressed(this, index);
 203                 }
 204         }
 205
 206         /**
 207          * Checks if the button pressed is handled internally
 208          * @return Returns true if button has been handled.
 209          */
 210         protected boolean managedButtonPressed(int index) {
 211                 if (index == fRemoveButtonIndex) {
 212                         remove();
 213                 } else if (index == fUpButtonIndex) {
 214                         up();
 215                 } else if (index == fDownButtonIndex) {
 216                         down();
 217                 } else {
 218                         return false;
 219                 }
 220                 return true;
 221         }
 222
 223
 224         // ------ layout helpers
 225
 226         /*
 227          * @see DialogField#doFillIntoGrid
 228          */
 229         public Control[] doFillIntoGrid(Composite parent, int nColumns) {
 230                 PixelConverter converter= new PixelConverter(parent);
 231
 232                 assertEnoughColumns(nColumns);
 233
 234                 Label label= getLabelControl(parent);
 235                 GridData gd= gridDataForLabel(1);
 236                 gd.verticalAlignment= GridData.BEGINNING;
 237                 label.setLayoutData(gd);
 238
 239                 Control list= getListControl(parent);
 240                 gd= new GridData();
 241                 gd.horizontalAlignment= GridData.FILL;
 242                 gd.grabExcessHorizontalSpace= false;
 243                 gd.verticalAlignment= GridData.FILL;
 244                 gd.grabExcessVerticalSpace= true;
 245                 gd.horizontalSpan= nColumns - 2;
 246                 gd.widthHint= converter.convertWidthInCharsToPixels(50);
 247                 gd.heightHint= converter.convertHeightInCharsToPixels(6);
 248
 249                 list.setLayoutData(gd);
 250
 251                 Composite buttons= getButtonBox(parent);
 252                 gd= new GridData();
 253                 gd.horizontalAlignment= GridData.FILL;
 254                 gd.grabExcessHorizontalSpace= false;
 255                 gd.verticalAlignment= GridData.FILL;
 256                 gd.grabExcessVerticalSpace= true;
 257                 gd.horizontalSpan= 1;
 258                 buttons.setLayoutData(gd);
 259
 260                 return new Control[] { label, list, buttons };
 261         }
 262
 263         /*
 264          * @see DialogField#getNumberOfControls
 265          */
 266         public int getNumberOfControls() {
 267                 return 3;
 268         }
 269
 270         /**
 271          * Sets the minimal width of the buttons. Must be called after widget creation.
 272          */
 273         public void setButtonsMinWidth(int minWidth) {
 274                 if (fLastSeparator != null) {
 275                         ((GridData)fLastSeparator.getLayoutData()).widthHint= minWidth;
 276                 }
 277         }
 278
 279
 280         // ------ ui creation
 281
 282         /**
 283          * Returns the list control. When called the first time, the control will be created.
 284          * @param The parent composite when called the first time, or <code>null</code>
 285          * after.
 286          */
 287         public Control getListControl(Composite parent) {
 288                 if (fTableControl == null) {
 289                         assertCompositeNotNull(parent);
 290
 291                         if (fTableColumns == null) {
 292                                 fTable= createTableViewer(parent);
 293                                 Table tableControl= fTable.getTable();
 294
 295                                 fTableControl= tableControl;
 296                                 tableControl.setLayout(new TableLayout());
 297                         } else {
 298                                 TableLayoutComposite composite= new TableLayoutComposite(parent, SWT.NONE);
 299                                 fTableControl= composite;
 300
 301                                 fTable= createTableViewer(composite);
 302                                 Table tableControl= fTable.getTable();
 303
 304                                 tableControl.setHeaderVisible(fTableColumns.headers != null);
 305                                 tableControl.setLinesVisible(fTableColumns.drawLines);
 306                                 ColumnLayoutData[] columns= fTableColumns.columns;
 307                                 for (int i= 0; i < columns.length; i++) {
 308                                         composite.addColumnData(columns[i]);
 309                                         TableColumn column= new TableColumn(tableControl, SWT.NONE);
 310                                         //tableLayout.addColumnData(columns[i]);
 311                                         if (fTableColumns.headers != null) {
 312                                                 column.setText(fTableColumns.headers[i]);
 313                                         }
 314                                 }
 315                         }
 316
 317                         fTable.getTable().addKeyListener(new KeyAdapter() {
 318                                 public void keyPressed(KeyEvent e) {
 319                                         handleKeyPressed(e);
 320                                 }
 321                         });
 322
 323                         //fTableControl.setLayout(tableLayout);
 324
 325                         fTable.setContentProvider(fListViewerAdapter);
 326                         fTable.setLabelProvider(fLabelProvider);
 327                         fTable.addSelectionChangedListener(fListViewerAdapter);
 328                         fTable.addDoubleClickListener(fListViewerAdapter);
 329
 330                         fTable.setInput(fParentElement);
 331
 332                         if (fViewerSorter != null) {
 333                                 fTable.setSorter(fViewerSorter);
 334                         }
 335
 336                         fTableControl.setEnabled(isEnabled());
 337                         if (fSelectionWhenEnabled != null) {
 338                                 postSetSelection(fSelectionWhenEnabled);
 339                         }
 340                 }
 341                 return fTableControl;
 342         }
 343
 344         /**
 345          * Returns the internally used table viewer.
 346          */
 347         public TableViewer getTableViewer() {
 348                 return fTable;
 349         }
 350
 351         /*
 352          * Subclasses may override to specify a different style.
 353          */
 354         protected int getListStyle(){
 355                 int style=  SWT.BORDER | SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL ;
 356                 if (fTableColumns != null) {
 357                         style |= SWT.FULL_SELECTION;
 358                 }
 359                 return style;
 360         }
 361
 362         protected TableViewer createTableViewer(Composite parent) {
 363                 Table table= new Table(parent, getListStyle());
 364                 return new TableViewer(table);
 365         }
 366
 367         protected Button createButton(Composite parent, String label, SelectionListener listener) {
 368                 Button button= new Button(parent, SWT.PUSH);
 369                 button.setText(label);
 370                 button.addSelectionListener(listener);
 371                 GridData gd= new GridData();
 372                 gd.horizontalAlignment= GridData.FILL;
 373                 gd.grabExcessHorizontalSpace= true;
 374                 gd.verticalAlignment= GridData.BEGINNING;
 375                 gd.heightHint = SWTUtil.getButtonHeigthHint(button);
 376                 gd.widthHint = SWTUtil.getButtonWidthHint(button);
 377
 378                 button.setLayoutData(gd);
 379                 return button;
 380         }
 381
 382         private Label createSeparator(Composite parent) {
 383                 Label separator= new Label(parent, SWT.NONE);
 384                 separator.setVisible(false);
 385                 GridData gd= new GridData();
 386                 gd.horizontalAlignment= GridData.FILL;
 387                 gd.verticalAlignment= GridData.BEGINNING;
 388                 gd.heightHint= 4;
 389                 separator.setLayoutData(gd);
 390                 return separator;
 391         }
 392
 393         /**
 394          * Returns the composite containing the buttons. When called the first time, the control
 395          * will be created.
 396          * @param The parent composite when called the first time, or <code>null</code>
 397          * after.
 398          */
 399         public Composite getButtonBox(Composite parent) {
 400                 if (fButtonsControl == null) {
 401                         assertCompositeNotNull(parent);
 402
 403                         SelectionListener listener= new SelectionListener() {
 404                                 public void widgetDefaultSelected(SelectionEvent e) {
 405                                         doButtonSelected(e);
 406                                 }
 407                                 public void widgetSelected(SelectionEvent e) {
 408                                         doButtonSelected(e);
 409                                 }
 410                         };
 411
 412                         Composite contents= new Composite(parent, SWT.NULL);
 413                         GridLayout layout= new GridLayout();
 414                         layout.marginWidth= 0;
 415                         layout.marginHeight= 0;
 416                         contents.setLayout(layout);
 417
 418                         if (fButtonLabels != null) {
 419                                 fButtonControls= new Button[fButtonLabels.length];
 420                                 for (int i= 0; i < fButtonLabels.length; i++) {
 421                                         String currLabel= fButtonLabels[i];
 422                                         if (currLabel != null) {
 423                                                 fButtonControls[i]= createButton(contents, currLabel, listener);
 424                                                 fButtonControls[i].setEnabled(isEnabled() && fButtonsEnabled[i]);
 425                                         } else {
 426                                                 fButtonControls[i]= null;
 427                                                 createSeparator(contents);
 428                                         }
 429                                 }
 430                         }
 431
 432                         fLastSeparator= createSeparator(contents);
 433
 434                         updateButtonState();
 435                         fButtonsControl= contents;
 436                 }
 437
 438                 return fButtonsControl;
 439         }
 440
 441         private void doButtonSelected(SelectionEvent e) {
 442                 if (fButtonControls != null) {
 443                         for (int i= 0; i < fButtonControls.length; i++) {
 444                                 if (e.widget == fButtonControls[i]) {
 445                                         buttonPressed(i);
 446                                         return;
 447                                 }
 448                         }
 449                 }
 450         }
 451
 452         /**
 453          * Handles key events in the table viewer. Specifically
 454          * when the delete key is pressed.
 455          */
 456         protected void handleKeyPressed(KeyEvent event) {
 457                 if (event.character == SWT.DEL && event.stateMask == 0) {
 458                         if (fRemoveButtonIndex != -1 && isButtonEnabled(fTable.getSelection(), fRemoveButtonIndex)) {
 459                                 managedButtonPressed(fRemoveButtonIndex);
 460                         }
 461                 }
 462         }
 463
 464         // ------ enable / disable management
 465
 466         /*
 467          * @see DialogField#dialogFieldChanged
 468          */
 469         public void dialogFieldChanged() {
 470                 super.dialogFieldChanged();
 471                 updateButtonState();
 472         }
 473
 474         /*
 475          * Updates the enable state of the all buttons
 476          */
 477         protected void updateButtonState() {
 478                 if (fButtonControls != null) {
 479                         ISelection sel= fTable.getSelection();
 480                         for (int i= 0; i < fButtonControls.length; i++) {
 481                                 Button button= fButtonControls[i];
 482                                 if (isOkToUse(button)) {
 483                                         button.setEnabled(isButtonEnabled(sel, i));
 484                                 }
 485                         }
 486                 }
 487         }
 488
 489         protected boolean getManagedButtonState(ISelection sel, int index) {
 490                 if (index == fRemoveButtonIndex) {
 491                         return !sel.isEmpty();
 492                 } else if (index == fUpButtonIndex) {
 493                         return !sel.isEmpty() && canMoveUp();
 494                 } else if (index == fDownButtonIndex) {
 495                         return !sel.isEmpty() && canMoveDown();
 496                 }
 497                 return true;
 498         }
 499
 500         /*
 501          * @see DialogField#updateEnableState
 502          */
 503         protected void updateEnableState() {
 504                 super.updateEnableState();
 505
 506                 boolean enabled= isEnabled();
 507                 if (isOkToUse(fTableControl)) {
 508                         if (!enabled) {
 509                                 fSelectionWhenEnabled= fTable.getSelection();
 510                                 selectElements(null);
 511                         } else {
 512                                 selectElements(fSelectionWhenEnabled);
 513                                 fSelectionWhenEnabled= null;
 514                         }
 515                         fTableControl.setEnabled(enabled);
 516                 }
 517                 updateButtonState();
 518         }
 519
 520         /**
 521          * Sets a button enabled or disabled.
 522          */
 523         public void enableButton(int index, boolean enable) {
 524                 if (fButtonsEnabled != null && index < fButtonsEnabled.length) {
 525                         fButtonsEnabled[index]= enable;
 526                         updateButtonState();
 527                 }
 528         }
 529
 530         private boolean isButtonEnabled(ISelection sel, int index) {
 531                 boolean extraState= getManagedButtonState(sel, index);
 532                 return isEnabled() && extraState && fButtonsEnabled[index];
 533         }
 534
 535
 536         // ------ model access
 537
 538         /**
 539          * Sets the elements shown in the list.
 540          */
 541         public void setElements(List elements) {
 542                 fElements= new ArrayList(elements);
 543                 if (fTable != null) {
 544                         fTable.refresh();
 545                 }
 546                 dialogFieldChanged();
 547         }
 548
 549         /**
 550          * Gets the elements shown in the list.
 551          * The list returned is a copy, so it can be modified by the user.
 552          */
 553         public List getElements() {
 554                 return new ArrayList(fElements);
 555         }
 556
 557         /**
 558          * Gets the elements shown at the given index.
 559          */
 560         public Object getElement(int index) {
 561                 return fElements.get(index);
 562         }
 563
 564         /**
 565         * Gets the index of an element in the list or -1 if element is not in list.
 566         */
 567         public int getIndexOfElement(Object elem) {
 568                 return fElements.indexOf(elem);
 569         }
 570
 571         /**
 572          * Replace an element.
 573          */
 574         public void replaceElement(Object oldElement, Object newElement) throws IllegalArgumentException {
 575                 int idx= fElements.indexOf(oldElement);
 576                 if (idx != -1) {
 577                         fElements.set(idx, newElement);
 578                         if (fTable != null) {
 579                                 List selected= getSelectedElements();
 580                                 if (selected.remove(oldElement)) {
 581                                         selected.add(newElement);
 582                                 }
 583                                 fTable.refresh();
 584                                 selectElements(new StructuredSelection(selected));
 585                         }
 586                         dialogFieldChanged();
 587                 } else {
 588                         throw new IllegalArgumentException();
 589                 }
 590         }
 591
 592         /**
 593          * Adds an element at the end of the list.
 594          */
 595         public void addElement(Object element) {
 596                 if (fElements.contains(element)) {
 597                         return;
 598                 }
 599                 fElements.add(element);
 600                 if (fTable != null) {
 601                         fTable.add(element);
 602                 }
 603                 dialogFieldChanged();
 604         }
 605
 606         /**
 607          * Adds elements at the end of the list.
 608          */
 609         public void addElements(List elements) {
 610                 int nElements= elements.size();
 611
 612                 if (nElements > 0) {
 613                         // filter duplicated
 614                         ArrayList elementsToAdd= new ArrayList(nElements);
 615
 616                         for (int i= 0; i < nElements; i++) {
 617                                 Object elem= elements.get(i);
 618                                 if (!fElements.contains(elem)) {
 619                                         elementsToAdd.add(elem);
 620                                 }
 621                         }
 622                         fElements.addAll(elementsToAdd);
 623                         if (fTable != null) {
 624                                 fTable.add(elementsToAdd.toArray());
 625                         }
 626                         dialogFieldChanged();
 627                 }
 628         }
 629
 630         /**
 631          * Adds an element at a position.
 632          */
 633         public void insertElementAt(Object element, int index) {
 634                 if (fElements.contains(element)) {
 635                         return;
 636                 }
 637                 fElements.add(index, element);
 638                 if (fTable != null) {
 639                         fTable.add(element);
 640                 }
 641
 642                 dialogFieldChanged();
 643         }
 644
 645
 646         /**
 647          * Adds an element at a position.
 648          */
 649         public void removeAllElements() {
 650                 if (fElements.size() > 0) {
 651                         fElements.clear();
 652                         if (fTable != null) {
 653                                 fTable.refresh();
 654                         }
 655                         dialogFieldChanged();
 656                 }
 657         }
 658
 659         /**
 660          * Removes an element from the list.
 661          */
 662         public void removeElement(Object element) throws IllegalArgumentException {
 663                 if (fElements.remove(element)) {
 664                         if (fTable != null) {
 665                                 fTable.remove(element);
 666                         }
 667                         dialogFieldChanged();
 668                 } else {
 669                         throw new IllegalArgumentException();
 670                 }
 671         }
 672
 673         /**
 674          * Removes elements from the list.
 675          */
 676         public void removeElements(List elements) {
 677                 if (elements.size() > 0) {
 678                         fElements.removeAll(elements);
 679                         if (fTable != null) {
 680                                 fTable.remove(elements.toArray());
 681                         }
 682                         dialogFieldChanged();
 683                 }
 684         }
 685
 686         /**
 687          * Gets the number of elements
 688          */
 689         public int getSize() {
 690                 return fElements.size();
 691         }
 692
 693
 694         public void selectElements(ISelection selection) {
 695                 fSelectionWhenEnabled= selection;
 696                 if (fTable != null) {
 697                         fTable.setSelection(selection, true);
 698                 }
 699         }
 700
 701         public void selectFirstElement() {
 702                 Object element= null;
 703                 if (fViewerSorter != null) {
 704                         Object[] arr= fElements.toArray();
 705                         fViewerSorter.sort(fTable, arr);
 706                         if (arr.length > 0) {
 707                                 element= arr[0];
 708                         }
 709                 } else {
 710                         if (fElements.size() > 0) {
 711                                 element= fElements.get(0);
 712                         }
 713                 }
 714                 if (element != null) {
 715                         selectElements(new StructuredSelection(element));
 716                 }
 717         }
 718
 719
 720         public void postSetSelection(final ISelection selection) {
 721                 if (isOkToUse(fTableControl)) {
 722                         Display d= fTableControl.getDisplay();
 723                         d.asyncExec(new Runnable() {
 724                                 public void run() {
 725                                         if (isOkToUse(fTableControl)) {
 726                                                 selectElements(selection);
 727                                         }
 728                                 }
 729                         });
 730                 }
 731         }
 732
 733         /**
 734          * Refreshes the table.
 735          */
 736         public void refresh() {
 737                 if (fTable != null) {
 738                         fTable.refresh();
 739                 }
 740         }
 741
 742         // ------- list maintenance
 743
 744         private List moveUp(List elements, List move) {
 745                 int nElements= elements.size();
 746                 List res= new ArrayList(nElements);
 747                 Object floating= null;
 748                 for (int i= 0; i < nElements; i++) {
 749                         Object curr= elements.get(i);
 750                         if (move.contains(curr)) {
 751                                 res.add(curr);
 752                         } else {
 753                                 if (floating != null) {
 754                                         res.add(floating);
 755                                 }
 756                                 floating= curr;
 757                         }
 758                 }
 759                 if (floating != null) {
 760                         res.add(floating);
 761                 }
 762                 return res;
 763         }
 764
 765         private void moveUp(List toMoveUp) {
 766                 if (toMoveUp.size() > 0) {
 767                         setElements(moveUp(fElements, toMoveUp));
 768                         fTable.reveal(toMoveUp.get(0));
 769                 }
 770         }
 771
 772         private void moveDown(List toMoveDown) {
 773                 if (toMoveDown.size() > 0) {
 774                         setElements(reverse(moveUp(reverse(fElements), toMoveDown)));
 775                         fTable.reveal(toMoveDown.get(toMoveDown.size() - 1));
 776                 }
 777         }
 778
 779         private List reverse(List p) {
 780                 List reverse= new ArrayList(p.size());
 781                 for (int i= p.size()-1; i >= 0; i--) {
 782                         reverse.add(p.get(i));
 783                 }
 784                 return reverse;
 785         }
 786
 787
 788         private void remove() {
 789                 removeElements(getSelectedElements());
 790         }
 791
 792         private void up() {
 793                 moveUp(getSelectedElements());
 794         }
 795
 796         private void down() {
 797                 moveDown(getSelectedElements());
 798         }
 799
 800         private boolean canMoveUp() {
 801                 if (isOkToUse(fTableControl)) {
 802                         int[] indc= fTable.getTable().getSelectionIndices();
 803                         for (int i= 0; i < indc.length; i++) {
 804                                 if (indc[i] != i) {
 805                                         return true;
 806                                 }
 807                         }
 808                 }
 809                 return false;
 810         }
 811
 812         private boolean canMoveDown() {
 813                 if (isOkToUse(fTableControl)) {
 814                         int[] indc= fTable.getTable().getSelectionIndices();
 815                         int k= fElements.size() - 1;
 816                         for (int i= indc.length - 1; i >= 0 ; i--, k--) {
 817                                 if (indc[i] != k) {
 818                                         return true;
 819                                 }
 820                         }
 821                 }
 822                 return false;
 823         }
 824
 825         /**
 826          * Returns the selected elements.
 827          */
 828         public List getSelectedElements() {
 829                 List result= new ArrayList();
 830                 if (fTable != null) {
 831                         ISelection selection= fTable.getSelection();
 832                         if (selection instanceof IStructuredSelection) {
 833                                 Iterator iter= ((IStructuredSelection)selection).iterator();
 834                                 while (iter.hasNext()) {
 835                                         result.add(iter.next());
 836                                 }
 837                         }
 838                 }
 839                 return result;
 840         }
 841
 842         // ------- ListViewerAdapter
 843
 844         private class ListViewerAdapter implements IStructuredContentProvider, ISelectionChangedListener, IDoubleClickListener {
 845
 846                 // ------- ITableContentProvider Interface ------------
 847
 848                 public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
 849                         // will never happen
 850                 }
 851
 852                 public boolean isDeleted(Object element) {
 853                         return false;
 854                 }
 855
 856                 public void dispose() {
 857                 }
 858
 859                 public Object[] getElements(Object obj) {
 860                         return fElements.toArray();
 861                 }
 862
 863                 // ------- ISelectionChangedListener Interface ------------
 864
 865                 public void selectionChanged(SelectionChangedEvent event) {
 866                         doListSelected(event);
 867                 }
 868
 869                 /* (non-Javadoc)
 870                  * @see org.eclipse.jface.viewers.IDoubleClickListener#doubleClick(org.eclipse.jface.viewers.DoubleClickEvent)
 871                  */
 872                 public void doubleClick(DoubleClickEvent event) {
 873                         doDoubleClick(event);
 874                 }
 875
 876         }
 877
 878
 879         protected void doListSelected(SelectionChangedEvent event) {
 880                 updateButtonState();
 881                 if (fListAdapter != null) {
 882                         fListAdapter.selectionChanged(this);
 883                 }
 884         }
 885
 886         protected void doDoubleClick(DoubleClickEvent event) {
 887                 if (fListAdapter != null) {
 888                         fListAdapter.doubleClicked(this);
 889                 }
 890         }
 891
 892
 893
 894 }