Source Code Cross Referenced for XmlTree.java in  » IDE » J » org » armedbear » j » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE » J » org.armedbear.j 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * XmlTree.java
003:         *
004:         * Copyright (C) 2000-2003 Peter Graves
005:         * $Id: XmlTree.java,v 1.9 2003/07/23 15:46:59 piso Exp $
006:         *
007:         * This program is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU General Public License
009:         * as published by the Free Software Foundation; either version 2
010:         * of the License, or (at your option) any later version.
011:         *
012:         * This program is distributed in the hope that it will be useful,
013:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
014:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
015:         * GNU General Public License for more details.
016:         *
017:         * You should have received a copy of the GNU General Public License
018:         * along with this program; if not, write to the Free Software
019:         * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
020:         */
021:
022:        package org.armedbear.j;
023:
024:        import java.awt.Color;
025:        import java.awt.Component;
026:        import java.awt.Graphics;
027:        import java.awt.Point;
028:        import java.awt.event.InputEvent;
029:        import java.awt.event.KeyEvent;
030:        import java.awt.event.KeyListener;
031:        import java.awt.event.MouseEvent;
032:        import java.awt.event.MouseListener;
033:        import java.awt.event.MouseMotionListener;
034:        import java.io.StringReader;
035:        import java.util.Enumeration;
036:        import javax.swing.JTree;
037:        import javax.swing.SwingUtilities;
038:        import javax.swing.event.TreeSelectionEvent;
039:        import javax.swing.event.TreeSelectionListener;
040:        import javax.swing.tree.DefaultMutableTreeNode;
041:        import javax.swing.tree.DefaultTreeCellRenderer;
042:        import javax.swing.tree.TreeModel;
043:        import javax.swing.tree.TreePath;
044:        import javax.swing.tree.TreeSelectionModel;
045:
046:        public final class XmlTree extends JTree implements  Constants,
047:                NavigationComponent, TreeSelectionListener, MouseListener,
048:                MouseMotionListener, KeyListener {
049:            private final Editor editor;
050:            private final Buffer buffer;
051:            private String parserClassName;
052:            private boolean aelfred;
053:            private boolean xp;
054:            private int modificationCount = -1;
055:            private boolean disabled;
056:
057:            public XmlTree(Editor editor, TreeModel model) {
058:                super (model);
059:                this .editor = editor;
060:                this .buffer = editor.getBuffer();
061:                getSelectionModel().setSelectionMode(
062:                        TreeSelectionModel.SINGLE_TREE_SELECTION);
063:                addTreeSelectionListener(this );
064:                addMouseListener(this );
065:                addMouseMotionListener(this );
066:                addKeyListener(this );
067:                setCellRenderer(new XmlTreeCellRenderer(this ));
068:            }
069:
070:            public final String getLabelText() {
071:                return buffer.getFile() != null ? buffer.getFile().getName()
072:                        : null;
073:            }
074:
075:            public void setParserClassName(String className) {
076:                parserClassName = className;
077:                aelfred = false;
078:                xp = false;
079:                if (parserClassName.equals("org.armedbear.j.aelfred.SAXDriver"))
080:                    aelfred = true;
081:                else if (parserClassName.equals("com.jclark.xml.sax.Driver"))
082:                    xp = true;
083:            }
084:
085:            public final Editor getEditor() {
086:                return editor;
087:            }
088:
089:            public synchronized void refresh() {
090:                if (!SwingUtilities.isEventDispatchThread())
091:                    Debug
092:                            .bug("XmlTree.refresh() called from background thread!");
093:                if (disabled)
094:                    return;
095:                if (modificationCount == buffer.getModCount())
096:                    return;
097:                final XmlParserImpl parser = new XmlParserImpl(buffer);
098:                if (!parser.initialize())
099:                    return;
100:                modificationCount = buffer.getModCount();
101:                try {
102:                    final String text = buffer.getText();
103:                    if (text.length() < 7) // "<a></a>"
104:                        return;
105:                    parser.setReader(new StringReader(text));
106:                } catch (OutOfMemoryError e) {
107:                    outOfMemory();
108:                    return;
109:                }
110:                Runnable parseBufferRunnable = new Runnable() {
111:                    public void run() {
112:                        try {
113:                            parser.run();
114:                        } catch (OutOfMemoryError e) {
115:                            outOfMemory();
116:                            return;
117:                        }
118:                        if (parser.getException() == null) {
119:                            final TreeModel treeModel = parser.getTreeModel();
120:                            if (treeModel != null) {
121:                                setParserClassName(parser.getParserClassName());
122:                                Runnable r = new Runnable() {
123:                                    public void run() {
124:                                        setModel(treeModel);
125:                                        if (editor.getBuffer() == buffer)
126:                                            XmlMode.ensureCurrentNodeIsVisible(
127:                                                    editor, XmlTree.this );
128:                                    }
129:                                };
130:                                SwingUtilities.invokeLater(r);
131:                            }
132:                        }
133:                    }
134:                };
135:                new Thread(parseBufferRunnable).start();
136:            }
137:
138:            // Update the selected node in the tree, based on the position of dot in
139:            // the edit buffer.
140:            public void updatePosition() {
141:                if (disabled)
142:                    return;
143:                Position dot = editor.getDot();
144:                if (dot == null)
145:                    return;
146:                final Line dotLine = dot.getLine();
147:                final int dotOffset = dot.getOffset();
148:
149:                // Our line numbers are zero-based.
150:                final int dotLineNumber = editor.getDotLineNumber();
151:
152:                int rowToBeSelected = -1;
153:                final int limit = getRowCount();
154:                for (int row = 0; row < limit; row++) {
155:                    TreePath path = getPathForRow(row);
156:                    if (path != null) {
157:                        DefaultMutableTreeNode node = (DefaultMutableTreeNode) path
158:                                .getLastPathComponent();
159:                        if (node != null) {
160:                            XmlTreeElement treeElement = (XmlTreeElement) node
161:                                    .getUserObject();
162:                            // Tree element line numbers are one-based, so subtract 1.
163:                            final int lineNumber = treeElement.getLineNumber() - 1;
164:                            if (lineNumber == dotLineNumber) {
165:                                // Tree element column numbers are one-based, so
166:                                // subtract 1.
167:                                int columnNumber = treeElement
168:                                        .getColumnNumber();
169:                                if (columnNumber > 0) {
170:                                    // Tree element column numbers are one-based, so
171:                                    // subtract 1.
172:                                    --columnNumber;
173:                                }
174:                                int index;
175:                                if (columnNumber < 0) {
176:                                    // Crimson always reports -1 ("maintaining column
177:                                    // numbers hurts performance").
178:                                    index = findStartTag(treeElement.getName(),
179:                                            dotLine, 0);
180:                                } else if (xp) {
181:                                    // Position reported by XP is '<' of start tag.
182:                                    index = columnNumber;
183:                                } else {
184:                                    // Position reported by parser is next char after
185:                                    // '>' of start tag. Start reverse search 1 back
186:                                    // from there.
187:                                    index = reverseFindStartTag(treeElement
188:                                            .getName(), dotLine, columnNumber);
189:                                }
190:                                if (aelfred && index < 0) {
191:                                    // Aelfred's locator is very sloppy. Try forward
192:                                    // search.
193:                                    index = findStartTag(treeElement.getName(),
194:                                            dotLine, columnNumber);
195:                                }
196:                                // Make sure index is sane (the tree may need refreshing).
197:                                if (index < 0)
198:                                    index = 0;
199:                                else if (index > dotLine.length())
200:                                    index = dotLine.length();
201:                                if (dotOffset == index) {
202:                                    rowToBeSelected = row;
203:                                    break;
204:                                } else if (dotOffset < index) {
205:                                    // If dot is in whitespace at the beginning of the
206:                                    // line, immediately to the left of the current
207:                                    // node's start tag, we want the current node.
208:                                    if (Utilities.isWhitespace(dotLine
209:                                            .substring(0, index)))
210:                                        rowToBeSelected = row;
211:                                    break;
212:                                }
213:                            } else if (lineNumber > dotLineNumber)
214:                                break;
215:                            rowToBeSelected = row;
216:                        }
217:                    }
218:                }
219:
220:                if (rowToBeSelected >= 0) {
221:                    setSelectionRow(rowToBeSelected);
222:                    scrollRowToVisible(rowToBeSelected);
223:                } else
224:                    clearSelection();
225:
226:                repaint();
227:            }
228:
229:            private void outOfMemory() {
230:                disabled = true;
231:                treeModel = null;
232:                MessageDialog.showMessageDialog(
233:                        "Not enough memory to display tree", "XML Mode");
234:            }
235:
236:            public void valueChanged(TreeSelectionEvent e) {
237:                if (editor.getFocusedComponent() != this )
238:                    return;
239:                if (editor.getStatusBar() == null)
240:                    return;
241:                String statusText = "";
242:                DefaultMutableTreeNode node = (DefaultMutableTreeNode) getLastSelectedPathComponent();
243:                if (node != null) {
244:                    XmlTreeElement treeElement = (XmlTreeElement) node
245:                            .getUserObject();
246:                    statusText = treeElement.getStatusText();
247:                }
248:                editor.status(statusText);
249:            }
250:
251:            public void keyPressed(KeyEvent e) {
252:                final int keyCode = e.getKeyCode();
253:                final int modifiers = e.getModifiers();
254:                switch (keyCode) {
255:                // Ignore modifier keystrokes.
256:                case KeyEvent.VK_SHIFT:
257:                case KeyEvent.VK_CONTROL:
258:                case KeyEvent.VK_ALT:
259:                case KeyEvent.VK_META:
260:                    return;
261:                case KeyEvent.VK_ENTER: {
262:                    e.consume();
263:                    TreePath path = getSelectionPath();
264:                    if (path != null) {
265:                        DefaultMutableTreeNode node = (DefaultMutableTreeNode) path
266:                                .getLastPathComponent();
267:                        if (node != null)
268:                            moveDotToNode(node);
269:                    }
270:                    editor.setFocusToDisplay();
271:                    if (modifiers == KeyEvent.ALT_MASK)
272:                        editor.toggleSidebar();
273:                    return;
274:                }
275:                case KeyEvent.VK_TAB:
276:                    e.consume();
277:                    if (modifiers == 0) {
278:                        if (editor.getSidebar().getBufferList() != null)
279:                            editor
280:                                    .setFocus(editor.getSidebar()
281:                                            .getBufferList());
282:                    }
283:                    return;
284:                case KeyEvent.VK_ESCAPE:
285:                    e.consume();
286:                    editor.getSidebar().setBuffer();
287:                    editor.getSidebar().updatePosition();
288:                    editor.setFocusToDisplay();
289:                    return;
290:                }
291:                editor.getDispatcher().setEnabled(false);
292:            }
293:
294:            public void keyReleased(KeyEvent e) {
295:                e.consume();
296:                editor.getDispatcher().setEnabled(true);
297:            }
298:
299:            public void keyTyped(KeyEvent e) {
300:                e.consume();
301:            }
302:
303:            public void mousePressed(MouseEvent e) {
304:                LocationBar.cancelInput();
305:                editor.ensureActive();
306:                final int modifiers = e.getModifiers();
307:                if (modifiers == InputEvent.BUTTON1_MASK
308:                        || modifiers == InputEvent.BUTTON2_MASK) {
309:                    editor.setFocus(this );
310:                    if (modifiers == InputEvent.BUTTON2_MASK) {
311:                        int row = getRowForLocation(e.getX(), e.getY());
312:                        if (row >= 0)
313:                            setSelectionRow(row);
314:                    }
315:                } else
316:                    editor.setFocusToDisplay();
317:            }
318:
319:            public void mouseReleased(MouseEvent e) {
320:            }
321:
322:            public void mouseClicked(MouseEvent e) {
323:                final int modifiers = e.getModifiers();
324:                if (modifiers == InputEvent.BUTTON1_MASK
325:                        || modifiers == InputEvent.BUTTON2_MASK) {
326:                    Point point = e.getPoint();
327:                    moveDotToNodeAtPoint(point);
328:                }
329:                editor.setFocusToDisplay();
330:            }
331:
332:            public void mouseMoved(MouseEvent e) {
333:                if (editor.getStatusBar() == null)
334:                    return;
335:                String statusText = "";
336:                Point point = e.getPoint();
337:                TreePath path = getPathForLocation(point.x, point.y);
338:                if (path != null) {
339:                    DefaultMutableTreeNode node = (DefaultMutableTreeNode) path
340:                            .getLastPathComponent();
341:                    if (node != null) {
342:                        XmlTreeElement treeElement = (XmlTreeElement) node
343:                                .getUserObject();
344:                        statusText = treeElement.getStatusText();
345:                    }
346:                    editor.status(statusText);
347:                }
348:            }
349:
350:            public void mouseEntered(MouseEvent e) {
351:            }
352:
353:            public void mouseExited(MouseEvent e) {
354:                editor.setFocusToDisplay();
355:                if (editor.getStatusBar() != null) {
356:                    editor.getStatusBar().setText(null);
357:                    editor.getStatusBar().repaintNow();
358:                }
359:            }
360:
361:            public void mouseDragged(MouseEvent e) {
362:            }
363:
364:            private void moveDotToNode(DefaultMutableTreeNode node) {
365:                if (node == null)
366:                    return;
367:                XmlTreeElement treeElement = (XmlTreeElement) node
368:                        .getUserObject();
369:                String name = treeElement.getName();
370:
371:                // Subtract 1 since our line numbers are zero-based.
372:                int lineNumber = treeElement.getLineNumber() - 1;
373:
374:                Editor editor = Editor.currentEditor();
375:                Line line = editor.getBuffer().getLine(lineNumber);
376:                if (line != null) {
377:                    int offset;
378:                    if (treeElement.getColumnNumber() < 0) {
379:                        // Crimson always reports -1.
380:                        offset = findStartTag(name, line, 0);
381:                    } else if (xp) {
382:                        // Position reported by XP is '<' of start tag.
383:                        offset = treeElement.getColumnNumber() - 1;
384:                    } else {
385:                        offset = 0;
386:
387:                        // The line and column numbers stored in the tree element
388:                        // refer (in theory) to the position just past the end of the
389:                        // start tag. Subtract 1 since our offsets are zero-based.
390:                        int endOfStartTag = treeElement.getColumnNumber() - 1;
391:
392:                        if (endOfStartTag >= 0) {
393:                            if (aelfred) {
394:                                // Aelfred.
395:                                // Look for start of start tag.
396:                                int startOfStartTag = reverseFindStartTag(name,
397:                                        line, endOfStartTag - 1);
398:                                if (startOfStartTag < 0)
399:                                    startOfStartTag = findStartTag(name, line,
400:                                            endOfStartTag);
401:                                if (startOfStartTag >= 0)
402:                                    offset = startOfStartTag;
403:                            } else {
404:                                // Not Aelfred.
405:                                // Look for start of start tag.
406:                                int startOfStartTag = reverseFindStartTag(name,
407:                                        line, endOfStartTag - 1);
408:                                while (startOfStartTag < 0) {
409:                                    // Not found on current line. Look at previous line.
410:                                    if (line.previous() == null)
411:                                        break;
412:                                    line = line.previous();
413:                                    startOfStartTag = reverseFindStartTag(name,
414:                                            line, line.length());
415:                                }
416:                                if (startOfStartTag >= 0)
417:                                    offset = startOfStartTag;
418:                            }
419:                        }
420:                    }
421:                    editor.addUndo(SimpleEdit.MOVE);
422:                    if (editor.getMark() != null) {
423:                        editor.setMark(null);
424:                        editor.setUpdateFlag(REPAINT);
425:                    }
426:                    editor.update(editor.getDotLine());
427:                    // Make sure offset is sane.
428:                    if (offset < 0)
429:                        offset = 0;
430:                    else if (offset > line.length())
431:                        offset = line.length();
432:                    editor.setDot(line, offset);
433:                    editor.update(editor.getDotLine());
434:
435:                    // Make sure end tag is visible if possible.
436:                    Position end = findMatchingEndTagOnSameLine(name, editor
437:                            .getDot());
438:
439:                    if (end != null)
440:                        end.skip(name.length() + 3); // "</" + name + ">"
441:                    else
442:                        end = new Position(line, line.length() - 1);
443:                    int absCol = buffer.getCol(end);
444:                    editor.getDisplay().ensureColumnVisible(line, absCol);
445:                    editor.moveCaretToDotCol();
446:                    editor.updateDisplay();
447:                }
448:            }
449:
450:            private void moveDotToNodeAtPoint(Point point) {
451:                TreePath path = getPathForLocation(point.x, point.y);
452:                if (path != null) {
453:                    DefaultMutableTreeNode node = (DefaultMutableTreeNode) path
454:                            .getLastPathComponent();
455:                    moveDotToNode(node);
456:                }
457:            }
458:
459:            public DefaultMutableTreeNode getNodeAtPos(Position where) {
460:                if (treeModel == null)
461:                    return null;
462:                DefaultMutableTreeNode root = (DefaultMutableTreeNode) treeModel
463:                        .getRoot();
464:                if (root == null)
465:                    return null;
466:
467:                // Search backwards from starting point to find nearest '<' (start of
468:                // current node).
469:                Position pos = new Position(where);
470:                while (pos.getChar() != '<')
471:                    if (!pos.prev())
472:                        break;
473:
474:                // Skip past '<'.
475:                pos.next();
476:
477:                // One more for good measure. (Aelfred is sloppy!)
478:                pos.next();
479:
480:                // The starting location reported by the parser and stored in the tree
481:                // element refers (in theory) to the position just past the end of the
482:                // start tag. We want to find the node whose reported starting
483:                // location is after pos, but closest to it.
484:
485:                // Our line numbers and offsets are zero-based.
486:                int targetLineNumber = pos.lineNumber() + 1;
487:                int targetColumnNumber = pos.getOffset() + 1;
488:
489:                DefaultMutableTreeNode currentNode = null;
490:                int currentLineDelta = Integer.MAX_VALUE;
491:                int currentColumnDelta = Integer.MAX_VALUE;
492:                Enumeration nodes = root.depthFirstEnumeration();
493:                while (nodes.hasMoreElements()) {
494:                    DefaultMutableTreeNode node = (DefaultMutableTreeNode) nodes
495:                            .nextElement();
496:                    XmlTreeElement treeElement = (XmlTreeElement) node
497:                            .getUserObject();
498:                    int lineDelta = treeElement.getLineNumber()
499:                            - targetLineNumber;
500:
501:                    // We want the smallest lineDelta >= 0.
502:                    if (lineDelta >= 0 && lineDelta < currentLineDelta) {
503:                        currentNode = node;
504:                        currentLineDelta = lineDelta;
505:                    }
506:                    if (lineDelta == 0 && currentLineDelta == 0) {
507:                        int columnDelta = treeElement.getColumnNumber()
508:                                - targetColumnNumber;
509:
510:                        // We want the smallest columnDelta >= 0.
511:                        if (columnDelta >= 0
512:                                && columnDelta < currentColumnDelta) {
513:                            currentNode = node;
514:                            currentColumnDelta = columnDelta;
515:                        }
516:                    }
517:                }
518:                return currentNode;
519:            }
520:
521:            private int findStartTag(String name, Line line, int start) {
522:                final String lookFor = '<' + name;
523:                final int length = lookFor.length();
524:                while (start + length < line.length()) {
525:                    int index = line.getText().indexOf(lookFor, start);
526:                    if (index < 0)
527:                        return index; // Not found.
528:                    int end = index + length;
529:                    if (end < line.length()) {
530:                        char c = line.charAt(end);
531:                        if (c == '/' || c == '>' || c <= ' ')
532:                            return index;
533:                    }
534:                    start = index + 1;
535:                }
536:                return -1; // Not found.
537:            }
538:
539:            private int reverseFindStartTag(String name, Line line, int start) {
540:                final String lookFor = '<' + name;
541:                final int length = lookFor.length();
542:                while (start >= 0) {
543:                    int index = line.getText().lastIndexOf(lookFor, start);
544:                    if (index < 0)
545:                        return index; // Not found.
546:                    int end = index + length;
547:                    if (end < line.length()) {
548:                        char c = line.charAt(end);
549:                        if (c == '/' || c == '>' || c <= ' ')
550:                            return index;
551:                    } else
552:                        return index;
553:                    start = index - lookFor.length();
554:                }
555:                return -1; // Not found.
556:            }
557:
558:            private static final String COMMENT_START = "<!--";
559:            private static final String COMMENT_END = "-->";
560:
561:            private Position findMatchingEndTagOnSameLine(String name,
562:                    Position start) {
563:                String toBeMatched = "<" + name;
564:                String match = "</" + name + ">";
565:                int count = 1;
566:                Position pos = new Position(start);
567:                pos.skip(toBeMatched.length());
568:                int limit = pos.getLineLength();
569:                while (pos.getOffset() < limit) {
570:                    if (pos.lookingAt(COMMENT_START)) {
571:                        pos.skip(COMMENT_START.length());
572:                        while (pos.getOffset() < limit) {
573:                            if (pos.lookingAt(COMMENT_END)) {
574:                                pos.skip(COMMENT_END.length());
575:                                break;
576:                            }
577:                            pos.skip(1);
578:                        }
579:                    } else if (pos.lookingAtIgnoreCase(toBeMatched)) {
580:                        pos.skip(toBeMatched.length());
581:                        char c = pos.getChar();
582:                        if (c <= ' ' || c == '>') {
583:                            ++count;
584:                            pos.skip(1);
585:                        }
586:                    } else if (pos.lookingAtIgnoreCase(match)) {
587:                        --count;
588:                        if (count == 0)
589:                            return pos;
590:                        pos.skip(match.length());
591:                    } else
592:                        pos.skip(1);
593:                }
594:                return null;
595:            }
596:
597:            private static class XmlTreeCellRenderer extends
598:                    DefaultTreeCellRenderer {
599:                private XmlTree tree;
600:                private Editor editor;
601:
602:                private static Color noFocusSelectionBackground = new Color(
603:                        208, 208, 208);
604:
605:                private Color oldBackgroundSelectionColor;
606:
607:                public XmlTreeCellRenderer(XmlTree tree) {
608:                    super ();
609:                    this .tree = tree;
610:                    editor = tree.getEditor();
611:                    oldBackgroundSelectionColor = getBackgroundSelectionColor();
612:                    setOpenIcon(Utilities.getIconFromFile("branch.png"));
613:                    setClosedIcon(Utilities.getIconFromFile("branch.png"));
614:                    setLeafIcon(Utilities.getIconFromFile("leaf.png"));
615:                }
616:
617:                public Component getTreeCellRendererComponent(JTree tree,
618:                        Object value, boolean selected, boolean expanded,
619:                        boolean leaf, int row, boolean hasFocus) {
620:                    super .getTreeCellRendererComponent(tree, value, selected,
621:                            expanded, leaf, row, hasFocus);
622:                    if (selected)
623:                        super .setForeground(getTextSelectionColor());
624:                    else
625:                        super .setForeground(getTextNonSelectionColor());
626:                    if (editor.getFocusedComponent() == tree)
627:                        setBackgroundSelectionColor(oldBackgroundSelectionColor);
628:                    else
629:                        setBackgroundSelectionColor(noFocusSelectionBackground);
630:                    return this ;
631:                }
632:
633:                public void paintComponent(Graphics g) {
634:                    Display.setRenderingHints(g);
635:                    super.paintComponent(g);
636:                }
637:            }
638:        }
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