Source Code Cross Referenced for DiffDisplay.java in  » Source-Control » gruntspud » allensoft » diff » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Source Control » gruntspud » allensoft.diff 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:           Copyright 2001 Nicholas Allen (nallen@freenet.co.uk)
003:           This file is part of JavaCVS.
004:           JavaCVS is free software; you can redistribute it and/or modify
005:           it under the terms of the GNU General Public License as published by
006:           the Free Software Foundation; either version 2 of the License, or
007:           (at your option) any later version.
008:           JavaCVS is distributed in the hope that it will be useful,
009:           but WITHOUT ANY WARRANTY; without even the implied warranty of
010:           MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
011:           GNU General Public License for more details.
012:           You should have received a copy of the GNU General Public License
013:           along with JavaCVS; if not, write to the Free Software
014:           Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
015:         */
016:        package allensoft.diff;
017:
018:        import gruntspud.GruntspudContext;
019:        import gruntspud.standalone.JDK13GruntspudHost;
020:        import gruntspud.style.TextStyle;
021:
022:        import java.awt.Color;
023:        import java.awt.Dimension;
024:        import java.awt.Font;
025:        import java.awt.FontMetrics;
026:        import java.awt.Graphics;
027:        import java.awt.Rectangle;
028:        import java.util.ArrayList;
029:
030:        import javax.swing.JComponent;
031:        import javax.swing.JPanel;
032:        import javax.swing.JViewport;
033:        import javax.swing.Scrollable;
034:        import javax.swing.SwingConstants;
035:
036:        /* A component that displays differences with colored text and background. */
037:        public class DiffDisplay extends JPanel implements  Scrollable {
038:            private java.util.List m_Lines = new ArrayList(50);
039:            private Font m_DisplayFont;
040:            private FontMetrics m_FontMetrics = null;
041:            private int m_nTabSize;
042:            private TextStyle m_NoStyle;
043:            private TextStyle m_InsertStyle;
044:            private TextStyle m_DeleteStyle;
045:            private TextStyle m_ChangeStyle;
046:            private TextStyle m_NonExistantStyle;
047:            private JComponent m_RowHeader = null;
048:            private char[] m_Chars = new char[1];
049:            private int m_nMarginWidth;
050:
051:            /* Creates a new DiffDisplay using the supplied font for the text and tab size for
052:               the tabs. Lines of text to be displayed should be added with the addLine method. */
053:            public DiffDisplay(Font font, int nTabSize, GruntspudContext context) {
054:                setPreferredSize(new Dimension(100, 100));
055:                m_DisplayFont = font;
056:                m_nTabSize = nTabSize;
057:
058:                setNonExistantStyle(context.getTextStyleModel().getStyle(
059:                        JDK13GruntspudHost.OPTIONS_STYLE_DIFF_NON_EXISTANT));
060:                setStyle(DiffType.NONE, context.getTextStyleModel().getStyle(
061:                        JDK13GruntspudHost.OPTIONS_STYLE_DIFF_IDENTICAL));
062:                setStyle(
063:                        DiffType.INSERTION,
064:                        context
065:                                .getTextStyleModel()
066:                                .getStyle(
067:                                        JDK13GruntspudHost.OPTIONS_STYLE_DIFF_INSERTION));
068:                setStyle(DiffType.DELETION, context.getTextStyleModel()
069:                        .getStyle(
070:                                JDK13GruntspudHost.OPTIONS_STYLE_DIFF_DELETION));
071:                setStyle(DiffType.CHANGE, context.getTextStyleModel().getStyle(
072:                        JDK13GruntspudHost.OPTIONS_STYLE_DIFF_CHANGE));
073:
074:            }
075:
076:            /* Creates a DiffDisplay using a monospaced font and tab size for
077:               the tabs. Lines of text to be displayed should be added with the addLine method. */
078:            public DiffDisplay(int nTabSize, GruntspudContext context) {
079:                this (new Font("Monospaced", Font.PLAIN, 12), nTabSize, context);
080:            }
081:
082:            /* Creates a DiffDisplay using a monospaced font and a tab size of 4 for
083:               the tabs. Lines of text to be displayed should be added with the addLine method. */
084:            public DiffDisplay(GruntspudContext context) {
085:                this (4, context);
086:            }
087:
088:            /**
089:             * DOCUMENT ME!
090:             *
091:             * @return DOCUMENT ME!
092:             */
093:            public Dimension getPreferredScrollableViewportSize() {
094:                return getPreferredSize();
095:            }
096:
097:            /**
098:             * DOCUMENT ME!
099:             *
100:             * @param visibleRect DOCUMENT ME!
101:             * @param orientation DOCUMENT ME!
102:             * @param direction DOCUMENT ME!
103:             *
104:             * @return DOCUMENT ME!
105:             */
106:            public int getScrollableUnitIncrement(Rectangle visibleRect,
107:                    int orientation, int direction) {
108:                if (m_FontMetrics != null) {
109:                    if (orientation == SwingConstants.VERTICAL)
110:                        return m_FontMetrics.getHeight();
111:
112:                    return m_FontMetrics.charWidth(' ');
113:                }
114:
115:                return 10;
116:            }
117:
118:            /**
119:             * DOCUMENT ME!
120:             *
121:             * @param visibleRect DOCUMENT ME!
122:             * @param orientation DOCUMENT ME!
123:             * @param direction DOCUMENT ME!
124:             *
125:             * @return DOCUMENT ME!
126:             */
127:            public int getScrollableBlockIncrement(Rectangle visibleRect,
128:                    int orientation, int direction) {
129:                if (orientation == SwingConstants.VERTICAL)
130:                    return visibleRect.height;
131:
132:                return visibleRect.width;
133:            }
134:
135:            /**
136:             * DOCUMENT ME!
137:             *
138:             * @return DOCUMENT ME!
139:             */
140:            public boolean getScrollableTracksViewportWidth() {
141:                return false;
142:            }
143:
144:            /**
145:             * DOCUMENT ME!
146:             *
147:             * @return DOCUMENT ME!
148:             */
149:            public boolean getScrollableTracksViewportHeight() {
150:                return false;
151:            }
152:
153:            /** Adds a line to be displayed. This method should only be called
154:               before displaying this component. It should not be called after the
155:               component has been displayed. */
156:            public void addLine(int nLineNum, DiffType type, String sLine) {
157:                m_Lines.add(new Line(nLineNum, type, sLine));
158:            }
159:
160:            /**
161:             * DOCUMENT ME!
162:             */
163:            public void addNonExistantLine() {
164:                m_Lines.add(new Line(-1, DiffType.NONE, ""));
165:            }
166:
167:            /** Gets the font used to display the text. */
168:            public Font getDisplayFont() {
169:                return m_DisplayFont;
170:            }
171:
172:            /** Sets the font used to display the text. */
173:            public synchronized void setDisplayFont(Font font) {
174:                m_DisplayFont = font;
175:                m_FontMetrics = null;
176:                calculatePreferredSize();
177:            }
178:
179:            /**
180:             * DOCUMENT ME!
181:             *
182:             * @return DOCUMENT ME!
183:             */
184:            public int getTabSize() {
185:                return m_nTabSize;
186:            }
187:
188:            /**
189:             * DOCUMENT ME!
190:             *
191:             * @param nTabSize DOCUMENT ME!
192:             */
193:            public void setTabSize(int nTabSize) {
194:                m_nTabSize = nTabSize;
195:                calculatePreferredSize();
196:            }
197:
198:            /**
199:             * DOCUMENT ME!
200:             *
201:             * @param type DOCUMENT ME!
202:             *
203:             * @return DOCUMENT ME!
204:             */
205:            public TextStyle getStyle(DiffType type) {
206:                TextStyle style = m_NoStyle;
207:
208:                if (type == DiffType.NONE)
209:                    ;
210:
211:                else if (type == DiffType.INSERTION)
212:                    style = m_InsertStyle;
213:
214:                else if (type == DiffType.DELETION)
215:                    style = m_DeleteStyle;
216:
217:                else
218:                    style = m_ChangeStyle;
219:
220:                return style;
221:            }
222:
223:            /**
224:             * DOCUMENT ME!
225:             *
226:             * @param type DOCUMENT ME!
227:             * @param style DOCUMENT ME!
228:             */
229:            public synchronized void setStyle(DiffType type, TextStyle style) {
230:                if (type == DiffType.NONE) {
231:                    m_NoStyle = style;
232:                    setBackground(style.getBackground());
233:                } else if (type == DiffType.INSERTION)
234:                    m_InsertStyle = style;
235:
236:                else if (type == DiffType.DELETION)
237:                    m_DeleteStyle = style;
238:
239:                else
240:                    m_ChangeStyle = style;
241:
242:                repaint();
243:            }
244:
245:            /**
246:             * DOCUMENT ME!
247:             *
248:             * @return DOCUMENT ME!
249:             */
250:            public TextStyle getNonExistantStyle() {
251:                return m_NonExistantStyle;
252:            }
253:
254:            /**
255:             * DOCUMENT ME!
256:             *
257:             * @param style DOCUMENT ME!
258:             */
259:            public synchronized void setNonExistantStyle(TextStyle style) {
260:                m_NonExistantStyle = style;
261:            }
262:
263:            protected synchronized void paintComponent(Graphics g) {
264:                super .paintComponent(g);
265:
266:                // We can only calculate the size of this component from a FontMetrics which
267:                // can only be obtained from a Graphics object so we need to compute our preferred
268:                // size in this method.
269:                if (m_FontMetrics == null) {
270:                    m_FontMetrics = g.getFontMetrics(m_DisplayFont);
271:                    calculatePreferredSize();
272:
273:                    return;
274:                }
275:
276:                g.setFont(m_FontMetrics.getFont());
277:
278:                // Paint lines that need painting
279:                Rectangle clipBounds = g.getClipBounds();
280:                paintLines(g, clipBounds.y / m_FontMetrics.getHeight(),
281:                        (clipBounds.y + clipBounds.height)
282:                                / m_FontMetrics.getHeight());
283:
284:                // Draw left margin line
285:                g.setColor(Color.gray);
286:                g.drawLine(m_nMarginWidth, clipBounds.y, m_nMarginWidth,
287:                        clipBounds.y + clipBounds.height);
288:
289:                // Draw right margin line
290:                int x = getPreferredSize().width - 1;
291:                g
292:                        .drawLine(x, clipBounds.y, x, clipBounds.y
293:                                + clipBounds.height);
294:
295:                // Draw line showing end of file
296:                int y = (m_Lines.size() * m_FontMetrics.getHeight()) - 1;
297:                g.drawLine(0, y, getSize().width, y);
298:
299:                // Paint to the end of the viewport
300:                if (getParent() instanceof  JViewport) {
301:                    Dimension s = ((JViewport) getParent()).getSize();
302:                    y++;
303:                    //g.setColor(getBackground());
304:                    g.setColor(Color.red);
305:                    g.fillRect(0, y, s.width, s.height - y);
306:                }
307:            }
308:
309:            private void calculatePreferredSize() {
310:                int nWidth = 100;
311:
312:                if (m_FontMetrics == null)
313:                    return;
314:
315:                m_nMarginWidth = (String.valueOf(m_Lines.size()).length() + 1)
316:                        * m_FontMetrics.charWidth('9');
317:
318:                for (int i = 0; i < m_Lines.size(); i++) {
319:                    Line line = (Line) m_Lines.get(i);
320:
321:                    // Calculate width of line
322:                    String sLine = line.m_sLine;
323:                    int length = sLine.length();
324:                    int x = 0;
325:                    int nSpaceWidth = m_FontMetrics.charWidth(' ');
326:
327:                    for (int nChar = 0, nActual = 0; nChar < length; nChar++) {
328:                        char c = sLine.charAt(nChar);
329:
330:                        if (c == '\t') {
331:                            int nNumSpaces = (((nActual / m_nTabSize) + 1) * m_nTabSize)
332:                                    - nActual;
333:                            nActual += nNumSpaces;
334:                            x += (nSpaceWidth * nNumSpaces);
335:
336:                            continue;
337:                        } else if (c == ' ') {
338:                            nActual++;
339:                            x += nSpaceWidth;
340:
341:                            continue;
342:                        } else {
343:                            nActual++;
344:                            x += m_FontMetrics.charWidth(c);
345:                        }
346:                    }
347:
348:                    nWidth = Math.max(nWidth, x);
349:                }
350:
351:                setPreferredSize(new Dimension(m_nMarginWidth + nWidth,
352:                        m_FontMetrics.getHeight() * m_Lines.size()));
353:                revalidate();
354:                repaint();
355:            }
356:
357:            private void paintLines(Graphics g, int nStart, int nEnd) {
358:                for (int i = nStart; (i <= nEnd) && (i < m_Lines.size()); i++)
359:                    paintLine(g, i);
360:            }
361:
362:            public int lineYPos(int lineNo) {
363:                if (lineNo < 0) {
364:                    lineNo = 0;
365:                } else if (lineNo >= m_Lines.size()) {
366:                    lineNo = m_Lines.size() - 1;
367:                }
368:                return lineNo * m_FontMetrics.getHeight();
369:            }
370:
371:            private void paintLine(Graphics g, int nLine) {
372:                Line line = (Line) m_Lines.get(nLine);
373:                int nWidth = getSize().width;
374:                TextStyle style = (line.m_nLineNum == -1) ? m_NonExistantStyle
375:                        : getStyle(line.m_Type);
376:                int y = lineYPos(nLine);
377:
378:                g.setColor(style.getBackground());
379:                g.fillRect(0, y, nWidth, m_FontMetrics.getHeight());
380:
381:                y += m_FontMetrics.getAscent();
382:
383:                // Draw line number in margin
384:                if (line.m_nLineNum != -1) {
385:                    if (line.m_Type == DiffType.NONE)
386:                        g.setColor(Color.red);
387:
388:                    else
389:                        g.setColor(Color.black);
390:
391:                    g.drawString(String.valueOf(line.m_nLineNum), 0, y);
392:                }
393:
394:                // Draw characters
395:                g.setColor(style.getForeground());
396:
397:                String sLine = line.m_sLine;
398:                int length = sLine.length();
399:                int x = m_nMarginWidth;
400:                int nSpaceWidth = m_FontMetrics.charWidth(' ');
401:                Rectangle clipBounds = g.getClipBounds();
402:                int nStartClipX = clipBounds.x;
403:                int nEndClipX = clipBounds.x + clipBounds.width;
404:
405:                for (int nChar = 0, nActual = 0; nChar < length; nChar++) {
406:                    char c = sLine.charAt(nChar);
407:
408:                    if (c == '\t') {
409:                        int nNumSpaces = (((nActual / m_nTabSize) + 1) * m_nTabSize)
410:                                - nActual;
411:                        nActual += nNumSpaces;
412:                        x += (nSpaceWidth * nNumSpaces);
413:
414:                        continue;
415:                    } else if (c == ' ') {
416:                        nActual++;
417:                        x += nSpaceWidth;
418:
419:                        continue;
420:                    } else {
421:                        int nCharWidth = m_FontMetrics.charWidth(c);
422:                        int x2 = x + nCharWidth;
423:
424:                        // Only draw char if needed
425:                        if (!((x2 < nStartClipX) || (x > nEndClipX))) {
426:                            m_Chars[0] = c;
427:                            g.drawChars(m_Chars, 0, 1, x, y);
428:                        }
429:
430:                        if (x > nEndClipX)
431:                            break;
432:
433:                        nActual++;
434:                        x += nCharWidth;
435:                    }
436:                }
437:            }
438:
439:            java.util.List getLines() {
440:                return m_Lines;
441:            }
442:
443:        }
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