| 1 | /** |
| 2 | * Jexer - Java Text User Interface |
| 3 | * |
| 4 | * License: LGPLv3 or later |
| 5 | * |
| 6 | * This module is licensed under the GNU Lesser General Public License |
| 7 | * Version 3. Please see the file "COPYING" in this directory for more |
| 8 | * information about the GNU Lesser General Public License Version 3. |
| 9 | * |
| 10 | * Copyright (C) 2015 Kevin Lamonte |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or |
| 13 | * modify it under the terms of the GNU Lesser General Public License |
| 14 | * as published by the Free Software Foundation; either version 3 of |
| 15 | * the License, or (at your option) any later version. |
| 16 | * |
| 17 | * This program is distributed in the hope that it will be useful, but |
| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 20 | * General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU Lesser General Public |
| 23 | * License along with this program; if not, see |
| 24 | * http://www.gnu.org/licenses/, or write to the Free Software |
| 25 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA |
| 26 | * 02110-1301 USA |
| 27 | * |
| 28 | * @author Kevin Lamonte [kevin.lamonte@gmail.com] |
| 29 | * @version 1 |
| 30 | */ |
| 31 | package jexer; |
| 32 | |
| 33 | import static jexer.TKeypress.kbDown; |
| 34 | import static jexer.TKeypress.kbEnd; |
| 35 | import static jexer.TKeypress.kbHome; |
| 36 | import static jexer.TKeypress.kbLeft; |
| 37 | import static jexer.TKeypress.kbPgDn; |
| 38 | import static jexer.TKeypress.kbPgUp; |
| 39 | import static jexer.TKeypress.kbRight; |
| 40 | import static jexer.TKeypress.kbUp; |
| 41 | |
| 42 | import java.util.LinkedList; |
| 43 | import java.util.List; |
| 44 | |
| 45 | import jexer.bits.CellAttributes; |
| 46 | import jexer.event.TKeypressEvent; |
| 47 | import jexer.event.TMouseEvent; |
| 48 | |
| 49 | /** |
| 50 | * TText implements a simple scrollable text area. It reflows automatically on |
| 51 | * resize. |
| 52 | */ |
| 53 | public final class TText extends TWidget { |
| 54 | |
| 55 | /** |
| 56 | * Text to display. |
| 57 | */ |
| 58 | private String text; |
| 59 | |
| 60 | /** |
| 61 | * Text converted to lines. |
| 62 | */ |
| 63 | private List<String> lines; |
| 64 | |
| 65 | /** |
| 66 | * Text color. |
| 67 | */ |
| 68 | private String colorKey; |
| 69 | |
| 70 | /** |
| 71 | * Vertical scrollbar. |
| 72 | */ |
| 73 | private TVScroller vScroller; |
| 74 | |
| 75 | /** |
| 76 | * Horizontal scrollbar. |
| 77 | */ |
| 78 | private THScroller hScroller; |
| 79 | |
| 80 | /** |
| 81 | * Maximum width of a single line. |
| 82 | */ |
| 83 | private int maxLineWidth; |
| 84 | |
| 85 | /** |
| 86 | * Number of lines between each paragraph. |
| 87 | */ |
| 88 | private int lineSpacing = 1; |
| 89 | |
| 90 | /** |
| 91 | * Convenience method used by TWindowLoggerOutput. |
| 92 | * |
| 93 | * @param line |
| 94 | * new line to add |
| 95 | */ |
| 96 | public void addLine(final String line) { |
| 97 | if (text.length() == 0) { |
| 98 | text = line; |
| 99 | } else { |
| 100 | text += "\n\n"; |
| 101 | text += line; |
| 102 | } |
| 103 | reflow(); |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * Recompute the bounds for the scrollbars. |
| 108 | */ |
| 109 | private void computeBounds() { |
| 110 | maxLineWidth = 0; |
| 111 | for (String line : lines) { |
| 112 | if (line.length() > maxLineWidth) { |
| 113 | maxLineWidth = line.length(); |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | vScroller.setBottomValue((lines.size() - getHeight()) + 1); |
| 118 | if (vScroller.getBottomValue() < 0) { |
| 119 | vScroller.setBottomValue(0); |
| 120 | } |
| 121 | if (vScroller.getValue() > vScroller.getBottomValue()) { |
| 122 | vScroller.setValue(vScroller.getBottomValue()); |
| 123 | } |
| 124 | |
| 125 | hScroller.setRightValue((maxLineWidth - getWidth()) + 1); |
| 126 | if (hScroller.getRightValue() < 0) { |
| 127 | hScroller.setRightValue(0); |
| 128 | } |
| 129 | if (hScroller.getValue() > hScroller.getRightValue()) { |
| 130 | hScroller.setValue(hScroller.getRightValue()); |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | /** |
| 135 | * Insert newlines into a string to wrap it to a maximum column. Terminate |
| 136 | * the final string with a newline. Note that interior newlines are |
| 137 | * converted to spaces. |
| 138 | * |
| 139 | * @param str |
| 140 | * the string |
| 141 | * @param n |
| 142 | * the maximum number of characters in a line |
| 143 | * @return the wrapped string |
| 144 | */ |
| 145 | private String wrap(final String str, final int n) { |
| 146 | assert (n > 0); |
| 147 | |
| 148 | StringBuilder sb = new StringBuilder(); |
| 149 | StringBuilder word = new StringBuilder(); |
| 150 | int col = 0; |
| 151 | for (int i = 0; i < str.length(); i++) { |
| 152 | char ch = str.charAt(i); |
| 153 | if (ch == '\n') { |
| 154 | ch = ' '; |
| 155 | } |
| 156 | if (ch == ' ') { |
| 157 | sb.append(word.toString()); |
| 158 | sb.append(ch); |
| 159 | if (word.length() >= (n - 1)) { |
| 160 | sb.append('\n'); |
| 161 | col = 0; |
| 162 | } |
| 163 | word = new StringBuilder(); |
| 164 | } else { |
| 165 | word.append(ch); |
| 166 | } |
| 167 | |
| 168 | col++; |
| 169 | if (col >= (n - 1)) { |
| 170 | sb.append('\n'); |
| 171 | col = 0; |
| 172 | } |
| 173 | } |
| 174 | sb.append(word.toString()); |
| 175 | sb.append('\n'); |
| 176 | return sb.toString(); |
| 177 | } |
| 178 | |
| 179 | /** |
| 180 | * Resize text and scrollbars for a new width/height. |
| 181 | */ |
| 182 | public void reflow() { |
| 183 | // Reset the lines |
| 184 | lines.clear(); |
| 185 | |
| 186 | // Break up text into paragraphs |
| 187 | String[] paragraphs = text.split("\n\n"); |
| 188 | for (String p : paragraphs) { |
| 189 | String paragraph = wrap(p, getWidth() - 1); |
| 190 | for (String line : paragraph.split("\n")) { |
| 191 | lines.add(line); |
| 192 | } |
| 193 | for (int i = 0; i < lineSpacing; i++) { |
| 194 | lines.add(""); |
| 195 | } |
| 196 | } |
| 197 | |
| 198 | // Start at the top |
| 199 | if (vScroller == null) { |
| 200 | vScroller = new TVScroller(this, getWidth() - 1, 0, getHeight() - 1); |
| 201 | vScroller.setTopValue(0); |
| 202 | vScroller.setValue(0); |
| 203 | } else { |
| 204 | vScroller.setX(getWidth() - 1); |
| 205 | vScroller.setHeight(getHeight() - 1); |
| 206 | } |
| 207 | vScroller.setBigChange(getHeight() - 1); |
| 208 | |
| 209 | // Start at the left |
| 210 | if (hScroller == null) { |
| 211 | hScroller = new THScroller(this, 0, getHeight() - 1, getWidth() - 1); |
| 212 | hScroller.setLeftValue(0); |
| 213 | hScroller.setValue(0); |
| 214 | } else { |
| 215 | hScroller.setY(getHeight() - 1); |
| 216 | hScroller.setWidth(getWidth() - 1); |
| 217 | } |
| 218 | hScroller.setBigChange(getWidth() - 1); |
| 219 | |
| 220 | computeBounds(); |
| 221 | } |
| 222 | |
| 223 | /** |
| 224 | * Public constructor. |
| 225 | * |
| 226 | * @param parent |
| 227 | * parent widget |
| 228 | * @param text |
| 229 | * text on the screen |
| 230 | * @param x |
| 231 | * column relative to parent |
| 232 | * @param y |
| 233 | * row relative to parent |
| 234 | * @param width |
| 235 | * width of text area |
| 236 | * @param height |
| 237 | * height of text area |
| 238 | */ |
| 239 | public TText(final TWidget parent, final String text, final int x, |
| 240 | final int y, final int width, final int height) { |
| 241 | |
| 242 | this(parent, text, x, y, width, height, "ttext"); |
| 243 | } |
| 244 | |
| 245 | /** |
| 246 | * Public constructor. |
| 247 | * |
| 248 | * @param parent |
| 249 | * parent widget |
| 250 | * @param text |
| 251 | * text on the screen |
| 252 | * @param x |
| 253 | * column relative to parent |
| 254 | * @param y |
| 255 | * row relative to parent |
| 256 | * @param width |
| 257 | * width of text area |
| 258 | * @param height |
| 259 | * height of text area |
| 260 | * @param colorKey |
| 261 | * ColorTheme key color to use for foreground text. Default is |
| 262 | * "ttext" |
| 263 | */ |
| 264 | public TText(final TWidget parent, final String text, final int x, |
| 265 | final int y, final int width, final int height, |
| 266 | final String colorKey) { |
| 267 | |
| 268 | // Set parent and window |
| 269 | super(parent, x, y, width, height); |
| 270 | |
| 271 | this.text = text; |
| 272 | this.colorKey = colorKey; |
| 273 | |
| 274 | lines = new LinkedList<String>(); |
| 275 | |
| 276 | reflow(); |
| 277 | } |
| 278 | |
| 279 | /** |
| 280 | * Draw the text box. |
| 281 | */ |
| 282 | @Override |
| 283 | public void draw() { |
| 284 | // Setup my color |
| 285 | CellAttributes color = getTheme().getColor(colorKey); |
| 286 | |
| 287 | int begin = vScroller.getValue(); |
| 288 | int topY = 0; |
| 289 | for (int i = begin; i < lines.size(); i++) { |
| 290 | String line = lines.get(i); |
| 291 | if (hScroller.getValue() < line.length()) { |
| 292 | line = line.substring(hScroller.getValue()); |
| 293 | } else { |
| 294 | line = ""; |
| 295 | } |
| 296 | String formatString = "%-" + Integer.toString(getWidth() - 1) + "s"; |
| 297 | getScreen().putStrXY(0, topY, String.format(formatString, line), |
| 298 | color); |
| 299 | topY++; |
| 300 | |
| 301 | if (topY >= (getHeight() - 1)) { |
| 302 | break; |
| 303 | } |
| 304 | } |
| 305 | |
| 306 | // Pad the rest with blank lines |
| 307 | for (int i = topY; i < (getHeight() - 1); i++) { |
| 308 | getScreen().hLineXY(0, i, getWidth() - 1, ' ', color); |
| 309 | } |
| 310 | |
| 311 | } |
| 312 | |
| 313 | /** |
| 314 | * Handle mouse press events. |
| 315 | * |
| 316 | * @param mouse |
| 317 | * mouse button press event |
| 318 | */ |
| 319 | @Override |
| 320 | public void onMouseDown(final TMouseEvent mouse) { |
| 321 | if (mouse.isMouseWheelUp()) { |
| 322 | vScroller.decrement(); |
| 323 | return; |
| 324 | } |
| 325 | if (mouse.isMouseWheelDown()) { |
| 326 | vScroller.increment(); |
| 327 | return; |
| 328 | } |
| 329 | |
| 330 | // Pass to children |
| 331 | super.onMouseDown(mouse); |
| 332 | } |
| 333 | |
| 334 | /** |
| 335 | * Handle keystrokes. |
| 336 | * |
| 337 | * @param keypress |
| 338 | * keystroke event |
| 339 | */ |
| 340 | @Override |
| 341 | public void onKeypress(final TKeypressEvent keypress) { |
| 342 | if (keypress.equals(kbLeft)) { |
| 343 | hScroller.decrement(); |
| 344 | } else if (keypress.equals(kbRight)) { |
| 345 | hScroller.increment(); |
| 346 | } else if (keypress.equals(kbUp)) { |
| 347 | vScroller.decrement(); |
| 348 | } else if (keypress.equals(kbDown)) { |
| 349 | vScroller.increment(); |
| 350 | } else if (keypress.equals(kbPgUp)) { |
| 351 | vScroller.bigDecrement(); |
| 352 | } else if (keypress.equals(kbPgDn)) { |
| 353 | vScroller.bigIncrement(); |
| 354 | } else if (keypress.equals(kbHome)) { |
| 355 | vScroller.toTop(); |
| 356 | } else if (keypress.equals(kbEnd)) { |
| 357 | vScroller.toBottom(); |
| 358 | } else { |
| 359 | // Pass other keys (tab etc.) on |
| 360 | super.onKeypress(keypress); |
| 361 | } |
| 362 | } |
| 363 | |
| 364 | } |