net.sourceforge.phpeclipse.ui/src/net/sourceforge/phpdt/internal/ui/text/java/hover/AnnotationExpansionControl.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2006 IBM Corporation 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  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 package net.sourceforge.phpdt.internal.ui.text.java.hover;
  12
  13 import java.util.ArrayList;
  14 import java.util.Iterator;
  15 import java.util.List;
  16
  17 import org.eclipse.jface.text.AbstractInformationControlManager;
  18 import org.eclipse.jface.text.DefaultInformationControl;
  19 import org.eclipse.jface.text.IInformationControl;
  20 import org.eclipse.jface.text.IInformationControlCreator;
  21 import org.eclipse.jface.text.IInformationControlExtension;
  22 import org.eclipse.jface.text.IInformationControlExtension2;
  23 import org.eclipse.jface.text.IRegion;
  24 import org.eclipse.jface.text.IViewportListener;
  25 import org.eclipse.jface.text.Position;
  26 import org.eclipse.jface.text.Region;
  27 import org.eclipse.jface.text.TextViewer;
  28 import org.eclipse.jface.text.source.Annotation;
  29 import org.eclipse.jface.text.source.IAnnotationAccess;
  30 import org.eclipse.jface.text.source.IAnnotationAccessExtension;
  31 import org.eclipse.jface.text.source.IAnnotationModel;
  32 import org.eclipse.jface.text.source.ISourceViewer;
  33 import org.eclipse.jface.text.source.IVerticalRulerInfo;
  34 import org.eclipse.jface.text.source.IVerticalRulerListener;
  35 import org.eclipse.jface.text.source.VerticalRulerEvent;
  36 import org.eclipse.jface.viewers.IDoubleClickListener;
  37 import org.eclipse.swt.SWT;
  38 import org.eclipse.swt.custom.StyleRange;
  39 import org.eclipse.swt.custom.StyledText;
  40 import org.eclipse.swt.events.DisposeEvent;
  41 import org.eclipse.swt.events.DisposeListener;
  42 import org.eclipse.swt.events.FocusListener;
  43 import org.eclipse.swt.events.MenuEvent;
  44 import org.eclipse.swt.events.MenuListener;
  45 import org.eclipse.swt.events.MouseAdapter;
  46 import org.eclipse.swt.events.MouseEvent;
  47 import org.eclipse.swt.events.MouseTrackAdapter;
  48 import org.eclipse.swt.events.MouseTrackListener;
  49 import org.eclipse.swt.events.PaintEvent;
  50 import org.eclipse.swt.events.PaintListener;
  51 import org.eclipse.swt.graphics.Color;
  52 import org.eclipse.swt.graphics.Cursor;
  53 import org.eclipse.swt.graphics.Point;
  54 import org.eclipse.swt.graphics.Rectangle;
  55 import org.eclipse.swt.layout.GridData;
  56 import org.eclipse.swt.layout.GridLayout;
  57 import org.eclipse.swt.widgets.Canvas;
  58 import org.eclipse.swt.widgets.Composite;
  59 import org.eclipse.swt.widgets.Control;
  60 import org.eclipse.swt.widgets.Display;
  61 import org.eclipse.swt.widgets.Event;
  62 import org.eclipse.swt.widgets.Layout;
  63 import org.eclipse.swt.widgets.Listener;
  64 import org.eclipse.swt.widgets.Menu;
  65 import org.eclipse.swt.widgets.Shell;
  66 import org.eclipse.swt.widgets.Widget;
  67
  68 /**
  69  * A control that can display a number of annotations. The control can decide
  70  * how it layouts the annotations to present them to the user.
  71  * <p>
  72  * This class got moved here form Platform Text since it was not used there and
  73  * caused discouraged access warnings. It will be moved down again once
  74  * annotation roll-over support is provided by Platform Text.
  75  * </p>
  76  * <p>
  77  * Each annotation can have its custom context menu and hover.
  78  * </p>
  79  *
  80  * @since 3.2
  81  */
  82 public class AnnotationExpansionControl implements IInformationControl,
  83                 IInformationControlExtension, IInformationControlExtension2 {
  84
  85         public interface ICallback {
  86                 void run(IInformationControlExtension2 control);
  87         }
  88
  89         /**
  90          * Input used by the control to display the annotations. TODO move to
  91          * top-level class TODO encapsulate fields
  92          *
  93          * @since 3.0
  94          */
  95         public static class AnnotationHoverInput {
  96                 public Annotation[] fAnnotations;
  97
  98                 public ISourceViewer fViewer;
  99
 100                 public IVerticalRulerInfo fRulerInfo;
 101
 102                 public IVerticalRulerListener fAnnotationListener;
 103
 104                 public IDoubleClickListener fDoubleClickListener;
 105
 106                 public ICallback redoAction;
 107
 108                 public IAnnotationModel model;
 109         }
 110
 111         private final class Item {
 112                 Annotation fAnnotation;
 113
 114                 Canvas canvas;
 115
 116                 StyleRange[] oldStyles;
 117
 118                 public void selected() {
 119                         Display disp = fShell.getDisplay();
 120                         canvas.setCursor(fHandCursor);
 121                         // TODO: shade - for now: set grey background
 122                         canvas.setBackground(getSelectionColor(disp));
 123
 124                         // highlight the viewer background at its position
 125                         oldStyles = setViewerBackground(fAnnotation);
 126
 127                         // set the selection
 128                         fSelection = this;
 129
 130                         if (fHoverManager != null)
 131                                 fHoverManager.showInformation();
 132
 133                         if (fInput.fAnnotationListener != null) {
 134                                 VerticalRulerEvent event = new VerticalRulerEvent(fAnnotation);
 135                                 fInput.fAnnotationListener.annotationSelected(event);
 136                         }
 137
 138                 }
 139
 140                 public void defaultSelected() {
 141                         if (fInput.fAnnotationListener != null) {
 142                                 VerticalRulerEvent event = new VerticalRulerEvent(fAnnotation);
 143                                 fInput.fAnnotationListener.annotationDefaultSelected(event);
 144                         }
 145
 146                         dispose();
 147                 }
 148
 149                 public void showContextMenu(Menu menu) {
 150                         if (fInput.fAnnotationListener != null) {
 151                                 VerticalRulerEvent event = new VerticalRulerEvent(fAnnotation);
 152                                 fInput.fAnnotationListener.annotationContextMenuAboutToShow(
 153                                                 event, menu);
 154                         }
 155                 }
 156
 157                 public void deselect() {
 158                         // hide the popup
 159                         // fHoverManager.disposeInformationControl();
 160
 161                         // deselect
 162                         fSelection = null;
 163
 164                         resetViewerBackground(oldStyles);
 165                         oldStyles = null;
 166
 167                         Display disp = fShell.getDisplay();
 168                         canvas.setCursor(null);
 169                         // TODO: remove shading - for now: set standard background
 170                         canvas
 171                                         .setBackground(disp
 172                                                         .getSystemColor(SWT.COLOR_INFO_BACKGROUND));
 173
 174                 }
 175
 176         }
 177
 178         /**
 179          * Disposes of an item
 180          */
 181         private final static class MyDisposeListener implements DisposeListener {
 182                 /*
 183                  * @see org.eclipse.swt.events.DisposeListener#widgetDisposed(org.eclipse.swt.events.DisposeEvent)
 184                  */
 185                 public void widgetDisposed(DisposeEvent e) {
 186                         Item item = (Item) ((Widget) e.getSource()).getData();
 187                         item.deselect();
 188                         item.canvas = null;
 189                         item.fAnnotation = null;
 190                         item.oldStyles = null;
 191
 192                         ((Widget) e.getSource()).setData(null);
 193                 }
 194         }
 195
 196         /**
 197          * Listener on context menu invocation on the items
 198          */
 199         private final class MyMenuDetectListener implements Listener {
 200                 /*
 201                  * @see org.eclipse.swt.widgets.Listener#handleEvent(org.eclipse.swt.widgets.Event)
 202                  */
 203                 public void handleEvent(Event event) {
 204                         if (event.type == SWT.MenuDetect) {
 205                                 // TODO: show per-item menu
 206                                 // for now: show ruler context menu
 207                                 if (fInput != null) {
 208                                         Control ruler = fInput.fRulerInfo.getControl();
 209                                         if (ruler != null && !ruler.isDisposed()) {
 210                                                 Menu menu = ruler.getMenu();
 211                                                 if (menu != null && !menu.isDisposed()) {
 212                                                         menu.setLocation(event.x, event.y);
 213                                                         menu.addMenuListener(new MenuListener() {
 214
 215                                                                 public void menuHidden(MenuEvent e) {
 216                                                                         dispose();
 217                                                                 }
 218
 219                                                                 public void menuShown(MenuEvent e) {
 220                                                                 }
 221
 222                                                         });
 223                                                         menu.setVisible(true);
 224                                                 }
 225                                         }
 226                                 }
 227                         }
 228                 }
 229         }
 230
 231         /**
 232          * Listener on mouse events on the items.
 233          */
 234         private final class MyMouseListener extends MouseAdapter {
 235                 /*
 236                  * @see org.eclipse.swt.events.MouseListener#mouseDoubleClick(org.eclipse.swt.events.MouseEvent)
 237                  */
 238                 public void mouseDoubleClick(MouseEvent e) {
 239                         Item item = (Item) ((Widget) e.getSource()).getData();
 240                         if (e.button == 1 && item.fAnnotation == fInput.fAnnotations[0]
 241                                         && fInput.fDoubleClickListener != null) {
 242                                 fInput.fDoubleClickListener.doubleClick(null);
 243                                 // special code for JDT to renew the annotation set.
 244                                 if (fInput.redoAction != null)
 245                                         fInput.redoAction.run(AnnotationExpansionControl.this);
 246                         }
 247                         // dispose();
 248                         // TODO special action to invoke double-click action on the vertical
 249                         // ruler
 250                         // how about
 251                         // Canvas can= (Canvas) e.getSource();
 252                         // Annotation a= (Annotation) can.getData();
 253                         // if (a != null) {
 254                         // a.getDoubleClickAction().run();
 255                         // }
 256                 }
 257
 258                 /*
 259                  * @see org.eclipse.swt.events.MouseListener#mouseUp(org.eclipse.swt.events.MouseEvent)
 260                  */
 261                 public void mouseUp(MouseEvent e) {
 262                         Item item = (Item) ((Widget) e.getSource()).getData();
 263                         // TODO for now, to make double click work: disable single click on
 264                         // the first item
 265                         // disable later when the annotationlistener selectively handles
 266                         // input
 267                         if (item != null && e.button == 1) // && item.fAnnotation !=
 268                                                                                                 // fInput.fAnnotations[0])
 269                                 item.defaultSelected();
 270                 }
 271
 272                 /*
 273                  * @see org.eclipse.swt.events.MouseAdapter#mouseDown(org.eclipse.swt.events.MouseEvent)
 274                  */
 275                 public void mouseDown(MouseEvent e) {
 276                         super.mouseDown(e);
 277                 }
 278         }
 279
 280         /**
 281          * Listener on mouse track events on the items.
 282          */
 283         private final class MyMouseTrackListener implements MouseTrackListener {
 284                 /*
 285                  * @see org.eclipse.swt.events.MouseTrackListener#mouseEnter(org.eclipse.swt.events.MouseEvent)
 286                  */
 287                 public void mouseEnter(MouseEvent e) {
 288                         Item item = (Item) ((Widget) e.getSource()).getData();
 289                         if (item != null)
 290                                 item.selected();
 291                 }
 292
 293                 /*
 294                  * @see org.eclipse.swt.events.MouseTrackListener#mouseExit(org.eclipse.swt.events.MouseEvent)
 295                  */
 296                 public void mouseExit(MouseEvent e) {
 297
 298                         Item item = (Item) ((Widget) e.getSource()).getData();
 299                         if (item != null)
 300                                 item.deselect();
 301
 302                         // if the event lies outside the entire popup, dispose
 303                         org.eclipse.swt.graphics.Region region = fShell.getRegion();
 304                         Canvas can = (Canvas) e.getSource();
 305                         Point p = can.toDisplay(e.x, e.y);
 306                         if (region == null) {
 307                                 Rectangle bounds = fShell.getBounds();
 308                                 // p= fShell.toControl(p);
 309                                 if (!bounds.contains(p))
 310                                         dispose();
 311                         } else {
 312                                 p = fShell.toControl(p);
 313                                 if (!region.contains(p))
 314                                         dispose();
 315                         }
 316
 317                 }
 318
 319                 /*
 320                  * @see org.eclipse.swt.events.MouseTrackListener#mouseHover(org.eclipse.swt.events.MouseEvent)
 321                  */
 322                 public void mouseHover(MouseEvent e) {
 323                         if (fHoverManager == null) {
 324                                 fHoverManager = new HoverManager();
 325                                 fHoverManager.takesFocusWhenVisible(false);
 326                                 fHoverManager.install(fComposite);
 327                                 fHoverManager.showInformation();
 328                         }
 329                 }
 330         }
 331
 332         /**
 333          *
 334          *
 335          * @since 3.0
 336          */
 337         public class LinearLayouter {
 338
 339                 private static final int ANNOTATION_SIZE = 14;
 340
 341                 private static final int BORDER_WIDTH = 2;
 342
 343                 public Layout getLayout(int itemCount) {
 344                         // simple layout: a row of items
 345                         GridLayout layout = new GridLayout(itemCount, true);
 346                         layout.horizontalSpacing = 1;
 347                         layout.verticalSpacing = 0;
 348                         layout.marginHeight = 1;
 349                         layout.marginWidth = 1;
 350                         return layout;
 351                 }
 352
 353                 public Object getLayoutData() {
 354                         GridData gridData = new GridData(
 355                                         ANNOTATION_SIZE + 2 * BORDER_WIDTH, ANNOTATION_SIZE + 2
 356                                                         * BORDER_WIDTH);
 357                         gridData.horizontalAlignment = GridData.CENTER;
 358                         gridData.verticalAlignment = GridData.CENTER;
 359                         return gridData;
 360                 }
 361
 362                 public int getAnnotationSize() {
 363                         return ANNOTATION_SIZE;
 364                 }
 365
 366                 public int getBorderWidth() {
 367                         return BORDER_WIDTH;
 368                 }
 369
 370                 public org.eclipse.swt.graphics.Region getShellRegion(int itemCount) {
 371                         // no special region - set to null for default shell size
 372                         return null;
 373                 }
 374
 375         }
 376
 377         /**
 378          * Listener on paint events on the items. Paints the annotation image on the
 379          * given <code>GC</code>.
 380          */
 381         private final class MyPaintListener implements PaintListener {
 382                 /*
 383                  * @see org.eclipse.swt.events.PaintListener#paintControl(org.eclipse.swt.events.PaintEvent)
 384                  */
 385                 public void paintControl(PaintEvent e) {
 386                         Canvas can = (Canvas) e.getSource();
 387                         Annotation a = ((Item) can.getData()).fAnnotation;
 388                         if (a != null) {
 389                                 Rectangle rect = new Rectangle(fLayouter.getBorderWidth(),
 390                                                 fLayouter.getBorderWidth(), fLayouter
 391                                                                 .getAnnotationSize(), fLayouter
 392                                                                 .getAnnotationSize());
 393                                 if (fAnnotationAccessExtension != null)
 394                                         fAnnotationAccessExtension.paint(a, e.gc, can, rect);
 395                         }
 396                 }
 397         }
 398
 399         /**
 400          * Our own private hover manager used to shop per-item pop-ups.
 401          */
 402         private final class HoverManager extends AbstractInformationControlManager {
 403
 404                 /**
 405                  *
 406                  */
 407                 public HoverManager() {
 408                         super(new IInformationControlCreator() {
 409                                 public IInformationControl createInformationControl(Shell parent) {
 410                                         return new DefaultInformationControl(parent);
 411                                 }
 412                         });
 413
 414                         setMargins(5, 10);
 415                         setAnchor(ANCHOR_BOTTOM);
 416                         setFallbackAnchors(new Anchor[] { ANCHOR_BOTTOM, ANCHOR_LEFT,
 417                                         ANCHOR_RIGHT });
 418                 }
 419
 420                 /*
 421                  * @see org.eclipse.jface.text.AbstractInformationControlManager#computeInformation()
 422                  */
 423                 protected void computeInformation() {
 424                         if (fSelection != null) {
 425                                 Rectangle subjectArea = fSelection.canvas.getBounds();
 426                                 Annotation annotation = fSelection.fAnnotation;
 427                                 String msg;
 428                                 if (annotation != null)
 429                                         msg = annotation.getText();
 430                                 else
 431                                         msg = null;
 432
 433                                 setInformation(msg, subjectArea);
 434                         }
 435                 }
 436
 437         }
 438
 439         /** Model data. */
 440         protected AnnotationHoverInput fInput;
 441
 442         /** The control's shell */
 443         private Shell fShell;
 444
 445         /** The composite combining all the items. */
 446         protected Composite fComposite;
 447
 448         /** The hand cursor. */
 449         private Cursor fHandCursor;
 450
 451         /** The currently selected item, or <code>null</code> if none is selected. */
 452         private Item fSelection;
 453
 454         /** The hover manager for the per-item hovers. */
 455         private HoverManager fHoverManager;
 456
 457         /** The annotation access extension. */
 458         private IAnnotationAccessExtension fAnnotationAccessExtension;
 459
 460         /* listener legion */
 461         private final MyPaintListener fPaintListener;
 462
 463         private final MyMouseTrackListener fMouseTrackListener;
 464
 465         private final MyMouseListener fMouseListener;
 466
 467         private final MyMenuDetectListener fMenuDetectListener;
 468
 469         private final DisposeListener fDisposeListener;
 470
 471         private final IViewportListener fViewportListener;
 472
 473         private LinearLayouter fLayouter;
 474
 475         /**
 476          * Creates a new control.
 477          *
 478          * @param parent
 479          * @param shellStyle
 480          * @param access
 481          */
 482         public AnnotationExpansionControl(Shell parent, int shellStyle,
 483                         IAnnotationAccess access) {
 484                 fPaintListener = new MyPaintListener();
 485                 fMouseTrackListener = new MyMouseTrackListener();
 486                 fMouseListener = new MyMouseListener();
 487                 fMenuDetectListener = new MyMenuDetectListener();
 488                 fDisposeListener = new MyDisposeListener();
 489                 fViewportListener = new IViewportListener() {
 490
 491                         public void viewportChanged(int verticalOffset) {
 492                                 dispose();
 493                         }
 494
 495                 };
 496                 fLayouter = new LinearLayouter();
 497
 498                 if (access instanceof IAnnotationAccessExtension)
 499                         fAnnotationAccessExtension = (IAnnotationAccessExtension) access;
 500
 501                 fShell = new Shell(parent, shellStyle | SWT.NO_FOCUS | SWT.ON_TOP);
 502                 Display display = fShell.getDisplay();
 503                 fShell.setBackground(display.getSystemColor(SWT.COLOR_BLACK));
 504                 fComposite = new Composite(fShell, SWT.NO_FOCUS | SWT.NO_REDRAW_RESIZE
 505                                 | SWT.NO_TRIM);
 506                 // fComposite= new Composite(fShell, SWT.NO_FOCUS | SWT.NO_REDRAW_RESIZE
 507                 // | SWT.NO_TRIM | SWT.V_SCROLL);
 508
 509                 GridLayout layout = new GridLayout(1, true);
 510                 layout.marginHeight = 0;
 511                 layout.marginWidth = 0;
 512                 fShell.setLayout(layout);
 513
 514                 GridData data = new GridData(GridData.FILL_BOTH);
 515                 data.heightHint = fLayouter.getAnnotationSize() + 2
 516                                 * fLayouter.getBorderWidth() + 4;
 517                 fComposite.setLayoutData(data);
 518                 fComposite.addMouseTrackListener(new MouseTrackAdapter() {
 519
 520                         public void mouseExit(MouseEvent e) {
 521                                 if (fComposite == null)
 522                                         return;
 523                                 Control[] children = fComposite.getChildren();
 524                                 Rectangle bounds = null;
 525                                 for (int i = 0; i < children.length; i++) {
 526                                         if (bounds == null)
 527                                                 bounds = children[i].getBounds();
 528                                         else
 529                                                 bounds.add(children[i].getBounds());
 530                                         if (bounds.contains(e.x, e.y))
 531                                                 return;
 532                                 }
 533
 534                                 // if none of the children contains the event, we leave the
 535                                 // popup
 536                                 dispose();
 537                         }
 538
 539                 });
 540
 541                 // fComposite.getVerticalBar().addListener(SWT.Selection, new Listener()
 542                 // {
 543                 //
 544                 // public void handleEvent(Event event) {
 545                 // Rectangle bounds= fShell.getBounds();
 546                 // int x= bounds.x - fLayouter.getAnnotationSize() -
 547                 // fLayouter.getBorderWidth();
 548                 // int y= bounds.y;
 549                 // fShell.setBounds(x, y, bounds.width, bounds.height);
 550                 // }
 551                 //
 552                 // });
 553
 554                 fHandCursor = new Cursor(display, SWT.CURSOR_HAND);
 555                 fShell.setCursor(fHandCursor);
 556                 fComposite.setCursor(fHandCursor);
 557
 558                 setInfoSystemColor();
 559         }
 560
 561         private void setInfoSystemColor() {
 562                 Display display = fShell.getDisplay();
 563                 setForegroundColor(display.getSystemColor(SWT.COLOR_INFO_FOREGROUND));
 564                 setBackgroundColor(display.getSystemColor(SWT.COLOR_INFO_BACKGROUND));
 565         }
 566
 567         /*
 568          * @see org.eclipse.jface.text.IInformationControl#setInformation(java.lang.String)
 569          */
 570         public void setInformation(String information) {
 571                 setInput(null);
 572         }
 573
 574         /*
 575          * @see org.eclipse.jface.text.IInformationControlExtension2#setInput(java.lang.Object)
 576          */
 577         public void setInput(Object input) {
 578                 if (fInput != null && fInput.fViewer != null)
 579                         fInput.fViewer.removeViewportListener(fViewportListener);
 580
 581                 if (input instanceof AnnotationHoverInput)
 582                         fInput = (AnnotationHoverInput) input;
 583                 else
 584                         fInput = null;
 585
 586                 inputChanged(fInput, null);
 587         }
 588
 589         protected void inputChanged(Object newInput, Object newSelection) {
 590                 refresh();
 591         }
 592
 593         protected void refresh() {
 594                 adjustItemNumber();
 595
 596                 if (fInput == null)
 597                         return;
 598
 599                 if (fInput.fAnnotations == null)
 600                         return;
 601
 602                 if (fInput.fViewer != null)
 603                         fInput.fViewer.addViewportListener(fViewportListener);
 604
 605                 fShell.setRegion(fLayouter.getShellRegion(fInput.fAnnotations.length));
 606
 607                 Layout layout = fLayouter.getLayout(fInput.fAnnotations.length);
 608                 fComposite.setLayout(layout);
 609
 610                 Control[] children = fComposite.getChildren();
 611                 for (int i = 0; i < fInput.fAnnotations.length; i++) {
 612                         Canvas canvas = (Canvas) children[i];
 613                         Item item = new Item();
 614                         item.canvas = canvas;
 615                         item.fAnnotation = fInput.fAnnotations[i];
 616                         canvas.setData(item);
 617                         canvas.redraw();
 618                 }
 619
 620         }
 621
 622         protected void adjustItemNumber() {
 623                 if (fComposite == null)
 624                         return;
 625
 626                 Control[] children = fComposite.getChildren();
 627                 int oldSize = children.length;
 628                 int newSize = fInput == null ? 0 : fInput.fAnnotations.length;
 629
 630                 Display display = fShell.getDisplay();
 631
 632                 // add missing items
 633                 for (int i = oldSize; i < newSize; i++) {
 634                         Canvas canvas = new Canvas(fComposite, SWT.NONE);
 635                         Object gridData = fLayouter.getLayoutData();
 636                         canvas.setLayoutData(gridData);
 637                         canvas.setBackground(display
 638                                         .getSystemColor(SWT.COLOR_INFO_BACKGROUND));
 639
 640                         canvas.addPaintListener(fPaintListener);
 641
 642                         canvas.addMouseTrackListener(fMouseTrackListener);
 643
 644                         canvas.addMouseListener(fMouseListener);
 645
 646                         canvas.addListener(SWT.MenuDetect, fMenuDetectListener);
 647
 648                         canvas.addDisposeListener(fDisposeListener);
 649                 }
 650
 651                 // dispose of exceeding resources
 652                 for (int i = oldSize; i > newSize; i--) {
 653                         Item item = (Item) children[i - 1].getData();
 654                         item.deselect();
 655                         children[i - 1].dispose();
 656                 }
 657
 658         }
 659
 660         /*
 661          * @see IInformationControl#setVisible(boolean)
 662          */
 663         public void setVisible(boolean visible) {
 664                 fShell.setVisible(visible);
 665         }
 666
 667         /*
 668          * @see IInformationControl#dispose()
 669          */
 670         public void dispose() {
 671                 if (fShell != null) {
 672                         if (!fShell.isDisposed())
 673                                 fShell.dispose();
 674                         fShell = null;
 675                         fComposite = null;
 676                         if (fHandCursor != null)
 677                                 fHandCursor.dispose();
 678                         fHandCursor = null;
 679                         if (fHoverManager != null)
 680                                 fHoverManager.dispose();
 681                         fHoverManager = null;
 682                         fSelection = null;
 683                 }
 684         }
 685
 686         /*
 687          * @see org.eclipse.jface.text.IInformationControlExtension#hasContents()
 688          */
 689         public boolean hasContents() {
 690                 return fInput.fAnnotations != null && fInput.fAnnotations.length > 0;
 691         }
 692
 693         /*
 694          * @see org.eclipse.jface.text.IInformationControl#setSizeConstraints(int,
 695          *      int)
 696          */
 697         public void setSizeConstraints(int maxWidth, int maxHeight) {
 698                 // fMaxWidth= maxWidth;
 699                 // fMaxHeight= maxHeight;
 700         }
 701
 702         /*
 703          * @see org.eclipse.jface.text.IInformationControl#computeSizeHint()
 704          */
 705         public Point computeSizeHint() {
 706                 return fShell.computeSize(SWT.DEFAULT, SWT.DEFAULT);
 707         }
 708
 709         /*
 710          * @see IInformationControl#setLocation(Point)
 711          */
 712         public void setLocation(Point location) {
 713                 fShell.setLocation(location);
 714         }
 715
 716         /*
 717          * @see IInformationControl#setSize(int, int)
 718          */
 719         public void setSize(int width, int height) {
 720                 fShell.setSize(width, height);
 721         }
 722
 723         /*
 724          * @see IInformationControl#addDisposeListener(DisposeListener)
 725          */
 726         public void addDisposeListener(DisposeListener listener) {
 727                 fShell.addDisposeListener(listener);
 728         }
 729
 730         /*
 731          * @see IInformationControl#removeDisposeListener(DisposeListener)
 732          */
 733         public void removeDisposeListener(DisposeListener listener) {
 734                 fShell.removeDisposeListener(listener);
 735         }
 736
 737         /*
 738          * @see IInformationControl#setForegroundColor(Color)
 739          */
 740         public void setForegroundColor(Color foreground) {
 741                 fComposite.setForeground(foreground);
 742         }
 743
 744         /*
 745          * @see IInformationControl#setBackgroundColor(Color)
 746          */
 747         public void setBackgroundColor(Color background) {
 748                 fComposite.setBackground(background);
 749         }
 750
 751         /*
 752          * @see IInformationControl#isFocusControl()
 753          */
 754         public boolean isFocusControl() {
 755                 if (fComposite.isFocusControl())
 756                         return true;
 757
 758                 Control[] children = fComposite.getChildren();
 759                 for (int i = 0; i < children.length; i++) {
 760                         if (children[i].isFocusControl())
 761                                 return true;
 762                 }
 763                 return false;
 764         }
 765
 766         /*
 767          * @see IInformationControl#setFocus()
 768          */
 769         public void setFocus() {
 770                 fShell.forceFocus();
 771         }
 772
 773         /*
 774          * @see IInformationControl#addFocusListener(FocusListener)
 775          */
 776         public void addFocusListener(FocusListener listener) {
 777                 fShell.addFocusListener(listener);
 778         }
 779
 780         /*
 781          * @see IInformationControl#removeFocusListener(FocusListener)
 782          */
 783         public void removeFocusListener(FocusListener listener) {
 784                 fShell.removeFocusListener(listener);
 785         }
 786
 787         private StyleRange[] setViewerBackground(Annotation annotation) {
 788                 StyledText text = fInput.fViewer.getTextWidget();
 789                 if (text == null || text.isDisposed())
 790                         return null;
 791
 792                 Display disp = text.getDisplay();
 793
 794                 Position pos = fInput.model.getPosition(annotation);
 795                 if (pos == null)
 796                         return null;
 797
 798                 IRegion region = ((TextViewer) fInput.fViewer)
 799                                 .modelRange2WidgetRange(new Region(pos.offset, pos.length));
 800                 if (region == null)
 801                         return null;
 802
 803                 StyleRange[] ranges = text.getStyleRanges(region.getOffset(), region
 804                                 .getLength());
 805
 806                 List undoRanges = new ArrayList(ranges.length);
 807                 for (int i = 0; i < ranges.length; i++) {
 808                         undoRanges.add(ranges[i].clone());
 809                 }
 810
 811                 int offset = region.getOffset();
 812                 StyleRange current = undoRanges.size() > 0 ? (StyleRange) undoRanges
 813                                 .get(0) : null;
 814                 int curStart = current != null ? current.start : region.getOffset()
 815                                 + region.getLength();
 816                 int curEnd = current != null ? current.start + current.length : -1;
 817                 int index = 0;
 818
 819                 // fill no-style regions
 820                 while (curEnd < region.getOffset() + region.getLength()) {
 821                         // add empty range
 822                         if (curStart > offset) {
 823                                 StyleRange undoRange = new StyleRange(offset,
 824                                                 curStart - offset, null, null);
 825                                 undoRanges.add(index, undoRange);
 826                                 index++;
 827                         }
 828
 829                         // step
 830                         index++;
 831                         if (index < undoRanges.size()) {
 832                                 offset = curEnd;
 833                                 current = (StyleRange) undoRanges.get(index);
 834                                 curStart = current.start;
 835                                 curEnd = current.start + current.length;
 836                         } else if (index == undoRanges.size()) {
 837                                 // last one
 838                                 offset = curEnd;
 839                                 current = null;
 840                                 curStart = region.getOffset() + region.getLength();
 841                                 curEnd = -1;
 842                         } else
 843                                 curEnd = region.getOffset() + region.getLength();
 844                 }
 845
 846                 // create modified styles (with background)
 847                 List shadedRanges = new ArrayList(undoRanges.size());
 848                 for (Iterator it = undoRanges.iterator(); it.hasNext();) {
 849                         StyleRange range = (StyleRange) ((StyleRange) it.next()).clone();
 850                         shadedRanges.add(range);
 851                         range.background = getHighlightColor(disp);
 852                 }
 853
 854                 // set the ranges one by one
 855                 for (Iterator iter = shadedRanges.iterator(); iter.hasNext();) {
 856                         text.setStyleRange((StyleRange) iter.next());
 857
 858                 }
 859
 860                 return (StyleRange[]) undoRanges.toArray(undoRanges
 861                                 .toArray(new StyleRange[0]));
 862         }
 863
 864         private void resetViewerBackground(StyleRange[] oldRanges) {
 865
 866                 if (oldRanges == null)
 867                         return;
 868
 869                 if (fInput == null)
 870                         return;
 871
 872                 StyledText text = fInput.fViewer.getTextWidget();
 873                 if (text == null || text.isDisposed())
 874                         return;
 875
 876                 // set the ranges one by one
 877                 for (int i = 0; i < oldRanges.length; i++) {
 878                         text.setStyleRange(oldRanges[i]);
 879                 }
 880         }
 881
 882         private Color getHighlightColor(Display disp) {
 883                 return disp.getSystemColor(SWT.COLOR_GRAY);
 884         }
 885
 886         private Color getSelectionColor(Display disp) {
 887                 return disp.getSystemColor(SWT.COLOR_GRAY);
 888         }
 889
 890 }