Source Code Cross Referenced for JConsole.java in  » XML-UI » xmlgui » org » beryl » gui » swing » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML UI » xmlgui » org.beryl.gui.swing 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Beryl - A web platform based on XML, XSLT and Java
003:         * This file is part of the Beryl XML GUI
004:         *
005:         * Copyright (C) 2004 Wenzel Jakob <wazlaf@tigris.org>
006:         *
007:         * This program is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU Lesser General Public
009:         * License as published by the Free Software Foundation; either
010:         * version 2.1 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 GNU
015:         * Lesser General Public License for more details.
016:         *
017:         * You should have received a copy of the GNU Lesser General Public
018:         * License along with this program; if not, write to the Free Software
019:         * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-3107  USA
020:         */
021:
022:        package org.beryl.gui.swing;
023:
024:        import java.awt.AWTEvent;
025:        import java.awt.Color;
026:        import java.awt.Font;
027:        import java.awt.FontMetrics;
028:        import java.awt.Graphics;
029:        import java.awt.Image;
030:        import java.awt.Insets;
031:        import java.awt.event.AdjustmentEvent;
032:        import java.awt.event.AdjustmentListener;
033:        import java.awt.event.MouseAdapter;
034:        import java.awt.event.MouseEvent;
035:        import java.awt.event.MouseWheelEvent;
036:        import java.awt.event.MouseWheelListener;
037:
038:        import javax.swing.JPanel;
039:        import javax.swing.JScrollBar;
040:        import javax.swing.border.EmptyBorder;
041:
042:        /**
043:         * JConsole - Very simplistic console widget supporting attributes
044:         * @version 1.0
045:         * @author Wenzel Jakob
046:         */
047:
048:        public class JConsole extends JPanel {
049:            private JScrollBar scrollBar = null;
050:            private ConsoleBuffer buffer = null;
051:            private Image bufferImage = null;
052:            private FontMetrics fontMetrics = null;
053:            private boolean drawCursor = false;
054:            private int cursorRow = 0;
055:            private int cursorColumn = 0;
056:            private Color cursorColor = null;
057:
058:            Font plainFont = null;
059:            Font boldFont = null;
060:            int columnWidth = -1;
061:            int rowHeight = -1;
062:            int descent = -1;
063:            int offset = 0;
064:            int width = -1;
065:            int height = -1;
066:            boolean dirty = false;
067:
068:            protected class ScrollBarListener implements  AdjustmentListener {
069:                public void adjustmentValueChanged(AdjustmentEvent event) {
070:                    offset = event.getValue();
071:                    dirty = true;
072:                    refresh();
073:                }
074:            };
075:
076:            protected class WheelListener implements  MouseWheelListener {
077:                public void mouseWheelMoved(MouseWheelEvent event) {
078:                    int notches = event.getWheelRotation();
079:                    scrollBar.setValue(scrollBar.getValue() + notches * 5);
080:                }
081:            };
082:
083:            protected class ConsoleMouseListener extends MouseAdapter {
084:                public void mouseClicked(MouseEvent e) {
085:                    requestFocus();
086:                }
087:            };
088:
089:            /**
090:             * Create the console widget
091:             */
092:            public JConsole() {
093:                /* Add a scrollbar */
094:                scrollBar = new JScrollBar();
095:                scrollBar.addAdjustmentListener(new ScrollBarListener());
096:                addMouseWheelListener(new WheelListener());
097:                add(scrollBar);
098:
099:                /* Construct the buffer */
100:                buffer = new ConsoleBuffer(this );
101:
102:                /* Setup a fixed size font */
103:                setFont(new Font("Monospaced", Font.PLAIN, 12));
104:
105:                /* Disable double buffering */
106:                setDoubleBuffered(false);
107:
108:                /* Set background color to black */
109:                setBackground(Color.BLACK);
110:
111:                /* Enable key events */
112:                enableEvents(AWTEvent.KEY_EVENT_MASK);
113:
114:                /* Make the console focusable */
115:                setFocusable(true);
116:
117:                /* Add a mouse listener */
118:                addMouseListener(new ConsoleMouseListener());
119:
120:                /* Set a border */
121:                setBorder(new EmptyBorder(3, 5, 5, 0));
122:
123:                /* Set the cursor color */
124:                cursorColor = Color.LIGHT_GRAY;
125:            }
126:
127:            /**
128:             * Set the font
129:             */
130:            public void setFont(Font font) {
131:                plainFont = new Font(font.getFamily(), Font.PLAIN, font
132:                        .getSize());
133:                boldFont = new Font(font.getFamily(), Font.BOLD, font.getSize());
134:                fontMetrics = getFontMetrics(plainFont);
135:                columnWidth = fontMetrics.charWidth('A');
136:                rowHeight = fontMetrics.getHeight();
137:                descent = fontMetrics.getDescent();
138:            }
139:
140:            /**
141:             * Return the cursor column
142:             */
143:            public int getCursorColumn() {
144:                return cursorColumn;
145:            }
146:
147:            /**
148:             * Return the table row
149:             */
150:            public int getCursorRow() {
151:                return cursorRow;
152:            }
153:
154:            /**
155:             * Return whether to draw the cursor
156:             */
157:            public boolean getDrawCursor() {
158:                return drawCursor;
159:            }
160:
161:            /**
162:             * Define whether to draw the cursor
163:             */
164:            public void setDrawCursor(boolean b) {
165:                drawCursor = b;
166:            }
167:
168:            /**
169:             * Return the cursor color
170:             */
171:            public Color getCursorColor() {
172:                return cursorColor;
173:            }
174:
175:            /**
176:             * Set the cursor color
177:             */
178:            public void setCursorColor(Color color) {
179:                cursorColor = color;
180:            }
181:
182:            /**
183:             * Setup the layout
184:             */
185:            public void doLayout() {
186:                super .doLayout();
187:
188:                width = getWidth();
189:                height = getHeight();
190:                int scrollBarWidth = scrollBar.getPreferredSize().width;
191:
192:                if (width < 0 || height < 0 || scrollBarWidth < 0)
193:                    return;
194:
195:                bufferImage = createImage(width, height);
196:
197:                scrollBar.setSize(scrollBarWidth, height);
198:                scrollBar.setLocation(width - scrollBarWidth, 0);
199:                scrollBar.setUnitIncrement(1);
200:                scrollBar.setBlockIncrement(height / rowHeight);
201:
202:                dirty = true;
203:                updateScrollbar();
204:                refresh();
205:            }
206:
207:            /**
208:             * Update the scroll bar values
209:             */
210:            void updateScrollbar() {
211:                Insets insets = getInsets();
212:                int visibleRows = (height - insets.top - insets.bottom)
213:                        / rowHeight;
214:                int rowCount = buffer.getRowCount();
215:
216:                if (visibleRows > rowCount)
217:                    visibleRows = rowCount;
218:
219:                scrollBar.setMinimum(0);
220:                scrollBar.setMaximum(rowCount);
221:                scrollBar.setVisibleAmount(visibleRows);
222:                if (offset + visibleRows > rowCount)
223:                    offset = rowCount - visibleRows;
224:                scrollBar.setValue(offset);
225:            }
226:
227:            /**
228:             * Scroll to a row
229:             */
230:            public void scrollToRow(int row) {
231:                scrollBar.setValue(row);
232:            }
233:
234:            /**
235:             * Scroll to the bottom
236:             */
237:            public void scrollToBottom() {
238:                scrollBar.setValue(scrollBar.getMaximum()
239:                        - scrollBar.getVisibleAmount());
240:            }
241:
242:            /**
243:             * Return the console buffer
244:             */
245:            public ConsoleBuffer getBuffer() {
246:                return buffer;
247:            }
248:
249:            /**
250:             * Set the cursor position
251:             */
252:            public void setCursorPosition(int row, int column) {
253:                if (getBuffer().getRowCount() > cursorRow)
254:                    getBuffer().getRow(cursorRow).markDirty();
255:                getBuffer().getRow(row).markDirty();
256:                cursorRow = row;
257:                cursorColumn = column;
258:            }
259:
260:            /**
261:             * Always call this function after you have changed the console
262:             * buffer. This causes a repaint of the modified rows
263:             */
264:            public void refresh() {
265:                if (bufferImage != null) {
266:                    Graphics g = bufferImage.getGraphics();
267:
268:                    g.setColor(getBackground());
269:                    if (dirty)
270:                        g.fillRect(0, 0, width, height);
271:
272:                    buffer.paintBuffer(g);
273:
274:                    dirty = false;
275:                    repaint();
276:                }
277:            }
278:
279:            /**
280:             * Transfer the buffer image to the screen
281:             */
282:            protected void paintComponent(Graphics g) {
283:                Insets insets = getInsets();
284:                int row = cursorRow - offset;
285:                int visibleRows = (height - insets.top - insets.bottom)
286:                        / rowHeight;
287:                boolean doDrawCursor = drawCursor && row >= 0
288:                        && row < visibleRows;
289:
290:                g.drawImage(bufferImage, 0, 0, width, height, 0, 0, width,
291:                        height, this);
292:
293:                if (doDrawCursor) {
294:                    g.setXORMode(getBackground());
295:                    g.setColor(cursorColor);
296:                    g.fillRect(insets.left + cursorColumn * columnWidth,
297:                            insets.top + row * rowHeight, columnWidth,
298:                            rowHeight);
299:                    g.setPaintMode();
300:                }
301:            }
302:        }
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