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1 /*
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2 * Copyright 2000 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.ui;
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26
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27 import javax.swing.text.*;
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28
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29 /** This class implements a special type of document in which edits
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30 can only be performed at the end, from "mark" to the end of the
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31 document. Thanks to Scott Violet for suggesting to subclass a
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32 Document implementation for this purpose. (Can't do it with
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33 DocumentEvents or UndoableEditEvents; however, in 1.4, there will
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34 be a DocumentFilter which will allow this kind of functionality.) */
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35
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36 public class EditableAtEndDocument extends PlainDocument {
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37 private int mark;
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38
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39 public void insertString(int offset, String text, AttributeSet a)
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40 throws BadLocationException {
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41 int len = getLength();
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42 super.insertString(len, text, a);
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43 }
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44
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45 public void remove(int offs, int len) throws BadLocationException {
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46 int start = offs;
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47 int end = offs + len;
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48
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49 int markStart = mark;
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50 int markEnd = getLength();
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51
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52 if ((end < markStart) || (start > markEnd)) {
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53 // no overlap
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54 return;
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55 }
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56
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57 // Determine interval intersection
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58 int cutStart = Math.max(start, markStart);
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59 int cutEnd = Math.min(end, markEnd);
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60 super.remove(cutStart, cutEnd - cutStart);
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61 }
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62
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63 public void setMark() {
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64 mark = getLength();
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65 }
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66
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67 public String getMarkedText() throws BadLocationException {
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68 return getText(mark, getLength() - mark);
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69 }
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70
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71 /** Used to reset the contents of this document */
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72 public void clear() {
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73 try {
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74 super.remove(0, getLength());
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75 setMark();
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76 }
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77 catch (BadLocationException e) {
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78 }
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79 }
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80 }
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