Source Code Cross Referenced for TextConsoleViewer.java in  » IDE-Eclipse » ui » org » eclipse » ui » console » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE Eclipse » ui » org.eclipse.ui.console 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*******************************************************************************
002:         * Copyright (c) 2000, 2007 IBM Corporation and others.
003:         * All rights reserved. This program and the accompanying materials
004:         * are made available under the terms of the Eclipse Public License v1.0
005:         * which accompanies this distribution, and is available at
006:         * http://www.eclipse.org/legal/epl-v10.html
007:         *
008:         * Contributors:
009:         *     IBM Corporation - initial API and implementation
010:         *******************************************************************************/package org.eclipse.ui.console;
011:
012:        import java.util.ArrayList;
013:        import java.util.List;
014:
015:        import org.eclipse.core.runtime.IProgressMonitor;
016:        import org.eclipse.core.runtime.IStatus;
017:        import org.eclipse.core.runtime.Status;
018:        import org.eclipse.jface.preference.JFacePreferences;
019:        import org.eclipse.jface.resource.ColorRegistry;
020:        import org.eclipse.jface.resource.JFaceColors;
021:        import org.eclipse.jface.resource.JFaceResources;
022:        import org.eclipse.jface.text.BadPositionCategoryException;
023:        import org.eclipse.jface.text.DocumentEvent;
024:        import org.eclipse.jface.text.IDocument;
025:        import org.eclipse.jface.text.IDocumentAdapter;
026:        import org.eclipse.jface.text.IDocumentListener;
027:        import org.eclipse.jface.text.IPositionUpdater;
028:        import org.eclipse.jface.text.IRegion;
029:        import org.eclipse.jface.text.Position;
030:        import org.eclipse.jface.text.source.SourceViewer;
031:        import org.eclipse.jface.util.IPropertyChangeListener;
032:        import org.eclipse.jface.util.PropertyChangeEvent;
033:        import org.eclipse.swt.SWT;
034:        import org.eclipse.swt.custom.LineBackgroundEvent;
035:        import org.eclipse.swt.custom.LineBackgroundListener;
036:        import org.eclipse.swt.custom.LineStyleEvent;
037:        import org.eclipse.swt.custom.LineStyleListener;
038:        import org.eclipse.swt.custom.StyleRange;
039:        import org.eclipse.swt.custom.StyledText;
040:        import org.eclipse.swt.events.MouseEvent;
041:        import org.eclipse.swt.events.MouseListener;
042:        import org.eclipse.swt.events.MouseMoveListener;
043:        import org.eclipse.swt.events.MouseTrackListener;
044:        import org.eclipse.swt.graphics.Color;
045:        import org.eclipse.swt.graphics.Cursor;
046:        import org.eclipse.swt.graphics.Font;
047:        import org.eclipse.swt.graphics.Point;
048:        import org.eclipse.swt.widgets.Composite;
049:        import org.eclipse.swt.widgets.Control;
050:        import org.eclipse.swt.widgets.Display;
051:        import org.eclipse.swt.widgets.Event;
052:        import org.eclipse.swt.widgets.Listener;
053:        import org.eclipse.ui.internal.console.ConsoleDocumentAdapter;
054:        import org.eclipse.ui.internal.console.ConsoleHyperlinkPosition;
055:        import org.eclipse.ui.progress.WorkbenchJob;
056:
057:        /**
058:         * Default viewer used to display a <code>TextConsole</code>.
059:         * <p>
060:         * Clients may subclass this class.
061:         * </p>
062:         * 
063:         * @since 3.1
064:         */
065:        public class TextConsoleViewer extends SourceViewer implements 
066:                LineStyleListener, LineBackgroundListener, MouseTrackListener,
067:                MouseMoveListener, MouseListener {
068:            /**
069:             * Adapts document to the text widget.
070:             */
071:            private ConsoleDocumentAdapter documentAdapter;
072:
073:            private IHyperlink hyperlink;
074:
075:            private Cursor handCursor;
076:
077:            private Cursor textCursor;
078:
079:            private int consoleWidth = -1;
080:
081:            private TextConsole console;
082:
083:            private IPropertyChangeListener propertyChangeListener;
084:
085:            private IDocumentListener documentListener = new IDocumentListener() {
086:                public void documentAboutToBeChanged(DocumentEvent event) {
087:                }
088:
089:                public void documentChanged(DocumentEvent event) {
090:                    updateLinks(event.fOffset);
091:                }
092:            };
093:            // event listener used to send event to hyperlink for IHyperlink2
094:            private Listener mouseUpListener = new Listener() {
095:                public void handleEvent(Event event) {
096:                    if (hyperlink != null) {
097:                        String selection = getTextWidget().getSelectionText();
098:                        if (selection.length() <= 0) {
099:                            if (event.button == 1) {
100:                                if (hyperlink instanceof  IHyperlink2) {
101:                                    ((IHyperlink2) hyperlink)
102:                                            .linkActivated(event);
103:                                } else {
104:                                    hyperlink.linkActivated();
105:                                }
106:                            }
107:                        }
108:                    }
109:                }
110:            };
111:
112:            WorkbenchJob revealJob = new WorkbenchJob("Reveal End of Document") {//$NON-NLS-1$
113:                public IStatus runInUIThread(IProgressMonitor monitor) {
114:                    StyledText textWidget = getTextWidget();
115:                    if (textWidget != null && !textWidget.isDisposed()) {
116:                        int lineCount = textWidget.getLineCount();
117:                        textWidget.setTopIndex(lineCount - 1);
118:                    }
119:                    return Status.OK_STATUS;
120:                }
121:            };
122:
123:            private IPositionUpdater positionUpdater = new IPositionUpdater() {
124:                public void update(DocumentEvent event) {
125:                    try {
126:                        IDocument document = getDocument();
127:                        if (document != null) {
128:                            Position[] positions = document
129:                                    .getPositions(ConsoleHyperlinkPosition.HYPER_LINK_CATEGORY);
130:                            for (int i = 0; i < positions.length; i++) {
131:                                Position position = positions[i];
132:                                if (position.offset == event.fOffset
133:                                        && position.length <= event.fLength) {
134:                                    position.delete();
135:                                }
136:                                if (position.isDeleted) {
137:                                    document
138:                                            .removePosition(
139:                                                    ConsoleHyperlinkPosition.HYPER_LINK_CATEGORY,
140:                                                    position);
141:                                }
142:                            }
143:                        }
144:                    } catch (BadPositionCategoryException e) {
145:                    }
146:                }
147:            };
148:
149:            /**
150:             * Constructs a new viewer in the given parent for the specified console.
151:             * 
152:             * @param parent
153:             *            containing widget
154:             * @param console
155:             *            text console
156:             */
157:            public TextConsoleViewer(Composite parent, TextConsole console) {
158:                super (parent, null, SWT.V_SCROLL | SWT.H_SCROLL);
159:                this .console = console;
160:
161:                IDocument document = console.getDocument();
162:                setDocument(document);
163:
164:                StyledText styledText = getTextWidget();
165:                styledText.setDoubleClickEnabled(true);
166:                styledText.addLineStyleListener(this );
167:                styledText.addLineBackgroundListener(this );
168:                styledText.setEditable(true);
169:                setFont(console.getFont());
170:                styledText.addMouseTrackListener(this );
171:                styledText.addListener(SWT.MouseUp, mouseUpListener);
172:
173:                ColorRegistry colorRegistry = JFaceResources.getColorRegistry();
174:                propertyChangeListener = new HyperlinkColorChangeListener();
175:                colorRegistry.addListener(propertyChangeListener);
176:
177:                revealJob.setSystem(true);
178:                document.addDocumentListener(documentListener);
179:                document.addPositionUpdater(positionUpdater);
180:            }
181:
182:            /**
183:             * Sets the tab width used by this viewer.
184:             * 
185:             * @param tabWidth
186:             *            the tab width used by this viewer
187:             */
188:            public void setTabWidth(int tabWidth) {
189:                StyledText styledText = getTextWidget();
190:                int oldWidth = styledText.getTabs();
191:                if (tabWidth != oldWidth) {
192:                    styledText.setTabs(tabWidth);
193:                }
194:            }
195:
196:            /**
197:             * Sets the font used by this viewer.
198:             * 
199:             * @param font
200:             *            the font used by this viewer
201:             */
202:            public void setFont(Font font) {
203:                StyledText styledText = getTextWidget();
204:                Font oldFont = styledText.getFont();
205:                if (oldFont == font) {
206:                    return;
207:                }
208:                if (font == null || !(font.equals(oldFont))) {
209:                    styledText.setFont(font);
210:                }
211:            }
212:
213:            /**
214:             * Positions the cursor at the end of the document.
215:             */
216:            protected void revealEndOfDocument() {
217:                revealJob.schedule(50);
218:            }
219:
220:            /*
221:             * (non-Javadoc)
222:             * 
223:             * @see org.eclipse.swt.custom.LineStyleListener#lineGetStyle(org.eclipse.swt.custom.LineStyleEvent)
224:             */
225:            public void lineGetStyle(LineStyleEvent event) {
226:                IDocument document = getDocument();
227:                if (document != null && document.getLength() > 0) {
228:                    ArrayList ranges = new ArrayList();
229:                    int offset = event.lineOffset;
230:                    int length = event.lineText.length();
231:
232:                    StyleRange[] partitionerStyles = ((IConsoleDocumentPartitioner) document
233:                            .getDocumentPartitioner()).getStyleRanges(
234:                            event.lineOffset, event.lineText.length());
235:                    if (partitionerStyles != null) {
236:                        for (int i = 0; i < partitionerStyles.length; i++) {
237:                            ranges.add(partitionerStyles[i]);
238:                        }
239:                    } else {
240:                        ranges.add(new StyleRange(offset, length, null, null));
241:                    }
242:
243:                    try {
244:                        Position[] positions = getDocument().getPositions(
245:                                ConsoleHyperlinkPosition.HYPER_LINK_CATEGORY);
246:                        Position[] overlap = findPosition(offset, length,
247:                                positions);
248:                        Color color = JFaceColors.getHyperlinkText(Display
249:                                .getCurrent());
250:                        if (overlap != null) {
251:                            for (int i = 0; i < overlap.length; i++) {
252:                                Position position = overlap[i];
253:                                StyleRange linkRange = new StyleRange(
254:                                        position.offset, position.length,
255:                                        color, null);
256:                                linkRange.underline = true;
257:                                override(ranges, linkRange);
258:                            }
259:                        }
260:                    } catch (BadPositionCategoryException e) {
261:                    }
262:
263:                    if (ranges.size() > 0) {
264:                        event.styles = (StyleRange[]) ranges
265:                                .toArray(new StyleRange[ranges.size()]);
266:                    }
267:                }
268:            }
269:
270:            private void override(List ranges, StyleRange newRange) {
271:                if (ranges.isEmpty()) {
272:                    ranges.add(newRange);
273:                    return;
274:                }
275:
276:                int start = newRange.start;
277:                int end = start + newRange.length;
278:                for (int i = 0; i < ranges.size(); i++) {
279:                    StyleRange existingRange = (StyleRange) ranges.get(i);
280:                    int rEnd = existingRange.start + existingRange.length;
281:                    if (end <= existingRange.start || start >= rEnd) {
282:                        continue;
283:                    }
284:
285:                    if (start < existingRange.start
286:                            && end > existingRange.start) {
287:                        start = existingRange.start;
288:                    }
289:
290:                    if (start >= existingRange.start && end <= rEnd) {
291:                        existingRange.length = start - existingRange.start;
292:                        ranges.add(++i, newRange);
293:                        if (end != rEnd) {
294:                            ranges.add(++i, new StyleRange(end, rEnd - end - 1,
295:                                    existingRange.foreground,
296:                                    existingRange.background));
297:                        }
298:                        return;
299:                    } else if (start >= existingRange.start && start < rEnd) {
300:                        existingRange.length = start - existingRange.start;
301:                        ranges.add(++i, newRange);
302:                    } else if (end >= rEnd) {
303:                        ranges.remove(i);
304:                    } else {
305:                        ranges.add(++i, new StyleRange(end + 1, rEnd - end + 1,
306:                                existingRange.foreground,
307:                                existingRange.background));
308:                    }
309:                }
310:            }
311:
312:            /**
313:             * Binary search for the positions overlapping the given range
314:             * 
315:             * @param offset
316:             *            the offset of the range
317:             * @param length
318:             *            the length of the range
319:             * @param positions
320:             *            the positions to search
321:             * @return the positions overlapping the given range, or <code>null</code>
322:             */
323:            private Position[] findPosition(int offset, int length,
324:                    Position[] positions) {
325:
326:                if (positions.length == 0)
327:                    return null;
328:
329:                int rangeEnd = offset + length;
330:                int left = 0;
331:                int right = positions.length - 1;
332:                int mid = 0;
333:                Position position = null;
334:
335:                while (left < right) {
336:
337:                    mid = (left + right) / 2;
338:
339:                    position = positions[mid];
340:                    if (rangeEnd < position.getOffset()) {
341:                        if (left == mid)
342:                            right = left;
343:                        else
344:                            right = mid - 1;
345:                    } else if (offset > (position.getOffset()
346:                            + position.getLength() - 1)) {
347:                        if (right == mid)
348:                            left = right;
349:                        else
350:                            left = mid + 1;
351:                    } else {
352:                        left = right = mid;
353:                    }
354:                }
355:
356:                List list = new ArrayList();
357:                int index = left - 1;
358:                if (index >= 0) {
359:                    position = positions[index];
360:                    while (index >= 0
361:                            && (position.getOffset() + position.getLength()) > offset) {
362:                        index--;
363:                        if (index > 0) {
364:                            position = positions[index];
365:                        }
366:                    }
367:                }
368:                index++;
369:                position = positions[index];
370:                while (index < positions.length
371:                        && (position.getOffset() < rangeEnd)) {
372:                    list.add(position);
373:                    index++;
374:                    if (index < positions.length) {
375:                        position = positions[index];
376:                    }
377:                }
378:
379:                if (list.isEmpty()) {
380:                    return null;
381:                }
382:                return (Position[]) list.toArray(new Position[list.size()]);
383:            }
384:
385:            /*
386:             * (non-Javadoc)
387:             * 
388:             * @see org.eclipse.swt.custom.LineBackgroundListener#lineGetBackground(org.eclipse.swt.custom.LineBackgroundEvent)
389:             */
390:            public void lineGetBackground(LineBackgroundEvent event) {
391:                event.lineBackground = null;
392:            }
393:
394:            /**
395:             * Returns the hand cursor.
396:             * 
397:             * @return the hand cursor
398:             */
399:            protected Cursor getHandCursor() {
400:                if (handCursor == null) {
401:                    handCursor = new Cursor(ConsolePlugin.getStandardDisplay(),
402:                            SWT.CURSOR_HAND);
403:                }
404:                return handCursor;
405:            }
406:
407:            /**
408:             * Returns the text cursor.
409:             * 
410:             * @return the text cursor
411:             */
412:            protected Cursor getTextCursor() {
413:                if (textCursor == null) {
414:                    textCursor = new Cursor(ConsolePlugin.getStandardDisplay(),
415:                            SWT.CURSOR_IBEAM);
416:                }
417:                return textCursor;
418:            }
419:
420:            /**
421:             * Notification a hyperlink has been entered.
422:             * 
423:             * @param link
424:             *            the link that was entered
425:             */
426:            protected void linkEntered(IHyperlink link) {
427:                Control control = getTextWidget();
428:                if (hyperlink != null) {
429:                    linkExited(hyperlink);
430:                }
431:                hyperlink = link;
432:                hyperlink.linkEntered();
433:                control.setCursor(getHandCursor());
434:                control.redraw();
435:                control.addMouseListener(this );
436:            }
437:
438:            /**
439:             * Notification a link was exited.
440:             * 
441:             * @param link
442:             *            the link that was exited
443:             */
444:            protected void linkExited(IHyperlink link) {
445:                link.linkExited();
446:                hyperlink = null;
447:                Control control = getTextWidget();
448:                control.setCursor(getTextCursor());
449:                control.redraw();
450:                control.removeMouseListener(this );
451:            }
452:
453:            /*
454:             * (non-Javadoc)
455:             * 
456:             * @see org.eclipse.swt.events.MouseTrackListener#mouseEnter(org.eclipse.swt.events.MouseEvent)
457:             */
458:            public void mouseEnter(MouseEvent e) {
459:                getTextWidget().addMouseMoveListener(this );
460:            }
461:
462:            /*
463:             * (non-Javadoc)
464:             * 
465:             * @see org.eclipse.swt.events.MouseTrackListener#mouseExit(org.eclipse.swt.events.MouseEvent)
466:             */
467:            public void mouseExit(MouseEvent e) {
468:                getTextWidget().removeMouseMoveListener(this );
469:                if (hyperlink != null) {
470:                    linkExited(hyperlink);
471:                }
472:            }
473:
474:            /*
475:             * (non-Javadoc)
476:             * 
477:             * @see org.eclipse.swt.events.MouseTrackListener#mouseHover(org.eclipse.swt.events.MouseEvent)
478:             */
479:            public void mouseHover(MouseEvent e) {
480:            }
481:
482:            /*
483:             * (non-Javadoc)
484:             * 
485:             * @see org.eclipse.swt.events.MouseMoveListener#mouseMove(org.eclipse.swt.events.MouseEvent)
486:             */
487:            public void mouseMove(MouseEvent e) {
488:                int offset = -1;
489:                try {
490:                    Point p = new Point(e.x, e.y);
491:                    offset = getTextWidget().getOffsetAtLocation(p);
492:                } catch (IllegalArgumentException ex) {
493:                    // out of the document range
494:                }
495:                updateLinks(offset);
496:            }
497:
498:            /**
499:             * The cursor has just be moved to the given offset, the mouse has hovered
500:             * over the given offset. Update link rendering.
501:             * 
502:             * @param offset
503:             */
504:            protected void updateLinks(int offset) {
505:                if (offset >= 0) {
506:                    IHyperlink link = getHyperlink(offset);
507:                    if (link != null) {
508:                        if (link.equals(hyperlink)) {
509:                            return;
510:                        }
511:                        linkEntered(link);
512:                        return;
513:                    }
514:                }
515:                if (hyperlink != null) {
516:                    linkExited(hyperlink);
517:                }
518:            }
519:
520:            /**
521:             * Returns the currently active hyperlink or <code>null</code> if none.
522:             * 
523:             * @return the currently active hyperlink or <code>null</code> if none
524:             */
525:            public IHyperlink getHyperlink() {
526:                return hyperlink;
527:            }
528:
529:            /**
530:             * Returns the hyperlink at the specified offset, or <code>null</code> if
531:             * none.
532:             * 
533:             * @param offset
534:             *            offset at which a hyperlink has been requested
535:             * @return hyperlink at the specified offset, or <code>null</code> if none
536:             */
537:            public IHyperlink getHyperlink(int offset) {
538:                if (offset >= 0 && console != null) {
539:                    return console.getHyperlink(offset);
540:                }
541:                return null;
542:            }
543:
544:            /*
545:             * (non-Javadoc)
546:             * 
547:             * @see org.eclipse.swt.events.MouseListener#mouseDoubleClick(org.eclipse.swt.events.MouseEvent)
548:             */
549:            public void mouseDoubleClick(MouseEvent e) {
550:            }
551:
552:            /*
553:             * (non-Javadoc)
554:             * 
555:             * @see org.eclipse.swt.events.MouseListener#mouseDown(org.eclipse.swt.events.MouseEvent)
556:             */
557:            public void mouseDown(MouseEvent e) {
558:            }
559:
560:            /*
561:             * (non-Javadoc)
562:             * 
563:             * @see org.eclipse.swt.events.MouseListener#mouseUp(org.eclipse.swt.events.MouseEvent)
564:             */
565:            public void mouseUp(MouseEvent e) {
566:            }
567:
568:            /*
569:             * (non-Javadoc)
570:             * 
571:             * @see org.eclipse.jface.text.TextViewer#createDocumentAdapter()
572:             */
573:            protected IDocumentAdapter createDocumentAdapter() {
574:                if (documentAdapter == null) {
575:                    documentAdapter = new ConsoleDocumentAdapter(
576:                            consoleWidth = -1);
577:                }
578:                return documentAdapter;
579:            }
580:
581:            /**
582:             * Sets the console to have a fixed character width. Use -1 to indicate that
583:             * a fixed width should not be used.
584:             * 
585:             * @param width
586:             *            fixed character width of the console, or -1
587:             */
588:            public void setConsoleWidth(int width) {
589:                if (consoleWidth != width) {
590:                    consoleWidth = width;
591:                    ConsolePlugin.getStandardDisplay().asyncExec(
592:                            new Runnable() {
593:                                public void run() {
594:                                    if (documentAdapter != null) {
595:                                        documentAdapter.setWidth(consoleWidth);
596:                                    }
597:                                }
598:                            });
599:                }
600:            }
601:
602:            /*
603:             * (non-Javadoc)
604:             * 
605:             * @see org.eclipse.jface.text.TextViewer#handleDispose()
606:             */
607:            protected void handleDispose() {
608:                IDocument document = getDocument();
609:                if (document != null) {
610:                    document.removeDocumentListener(documentListener);
611:                    document.removePositionUpdater(positionUpdater);
612:                }
613:
614:                StyledText styledText = getTextWidget();
615:                styledText.removeLineStyleListener(this );
616:                styledText.removeLineBackgroundListener(this );
617:                styledText.removeMouseTrackListener(this );
618:
619:                handCursor = null;
620:                textCursor = null;
621:                hyperlink = null;
622:                console = null;
623:
624:                ColorRegistry colorRegistry = JFaceResources.getColorRegistry();
625:                colorRegistry.removeListener(propertyChangeListener);
626:
627:                super .handleDispose();
628:            }
629:
630:            class HyperlinkColorChangeListener implements 
631:                    IPropertyChangeListener {
632:                public void propertyChange(PropertyChangeEvent event) {
633:                    if (event.getProperty().equals(
634:                            JFacePreferences.ACTIVE_HYPERLINK_COLOR)
635:                            || event.getProperty().equals(
636:                                    JFacePreferences.HYPERLINK_COLOR)) {
637:                        getTextWidget().redraw();
638:                    }
639:                }
640:
641:            }
642:
643:            /*
644:             * work around to memory leak in TextViewer$WidgetCommand
645:             */
646:            protected void updateTextListeners(WidgetCommand cmd) {
647:                super .updateTextListeners(cmd);
648:                cmd.preservedText = null;
649:                cmd.event = null;
650:                cmd.text = null;
651:            }
652:
653:            protected void internalRevealRange(int start, int end) {
654:                StyledText textWidget = getTextWidget();
655:                int startLine = documentAdapter.getLineAtOffset(start);
656:                int endLine = documentAdapter.getLineAtOffset(end);
657:
658:                int top = textWidget.getTopIndex();
659:                if (top > -1) {
660:                    // scroll vertically
661:                    int lines = getVisibleLinesInViewport();
662:                    int bottom = top + lines;
663:
664:                    // two lines at the top and the bottom should always be left
665:                    // if window is smaller than 5 lines, always center position is
666:                    // chosen
667:                    int bufferZone = 2;
668:                    if (startLine >= top + bufferZone
669:                            && startLine <= bottom - bufferZone
670:                            && endLine >= top + bufferZone
671:                            && endLine <= bottom - bufferZone) {
672:
673:                        // do not scroll at all as it is already visible
674:                    } else {
675:                        int delta = Math.max(0, lines - (endLine - startLine));
676:                        textWidget.setTopIndex(startLine - delta / 3);
677:                        updateViewportListeners(INTERNAL);
678:                    }
679:
680:                    // scroll horizontally
681:                    if (endLine < startLine) {
682:                        endLine += startLine;
683:                        startLine = endLine - startLine;
684:                        endLine -= startLine;
685:                    }
686:
687:                    int startPixel = -1;
688:                    int endPixel = -1;
689:
690:                    if (endLine > startLine) {
691:                        // reveal the beginning of the range in the start line
692:                        IRegion extent = getExtent(start, start);
693:                        startPixel = extent.getOffset()
694:                                + textWidget.getHorizontalPixel();
695:                        endPixel = startPixel;
696:                    } else {
697:                        IRegion extent = getExtent(start, end);
698:                        startPixel = extent.getOffset()
699:                                + textWidget.getHorizontalPixel();
700:                        endPixel = startPixel + extent.getLength();
701:                    }
702:
703:                    int visibleStart = textWidget.getHorizontalPixel();
704:                    int visibleEnd = visibleStart
705:                            + textWidget.getClientArea().width;
706:
707:                    // scroll only if not yet visible
708:                    if (startPixel < visibleStart || visibleEnd < endPixel) {
709:                        // set buffer zone to 10 pixels
710:                        bufferZone = 10;
711:                        int newOffset = visibleStart;
712:                        int visibleWidth = visibleEnd - visibleStart;
713:                        int selectionPixelWidth = endPixel - startPixel;
714:
715:                        if (startPixel < visibleStart)
716:                            newOffset = startPixel;
717:                        else if (selectionPixelWidth + bufferZone < visibleWidth)
718:                            newOffset = endPixel + bufferZone - visibleWidth;
719:                        else
720:                            newOffset = startPixel;
721:
722:                        float index = ((float) newOffset)
723:                                / ((float) getAverageCharWidth());
724:
725:                        textWidget.setHorizontalIndex(Math.round(index));
726:                    }
727:
728:                }
729:            }
730:
731:        }
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