| 1 | /* |
| 2 | * Jexer - Java Text User Interface |
| 3 | * |
| 4 | * The MIT License (MIT) |
| 5 | * |
| 6 | * Copyright (C) 2016 Kevin Lamonte |
| 7 | * |
| 8 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 9 | * copy of this software and associated documentation files (the "Software"), |
| 10 | * to deal in the Software without restriction, including without limitation |
| 11 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 12 | * and/or sell copies of the Software, and to permit persons to whom the |
| 13 | * Software is furnished to do so, subject to the following conditions: |
| 14 | * |
| 15 | * The above copyright notice and this permission notice shall be included in |
| 16 | * all copies or substantial portions of the Software. |
| 17 | * |
| 18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 20 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 21 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 22 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| 23 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
| 24 | * DEALINGS IN THE SOFTWARE. |
| 25 | * |
| 26 | * @author Kevin Lamonte [kevin.lamonte@gmail.com] |
| 27 | * @version 1 |
| 28 | */ |
| 29 | package jexer; |
| 30 | |
| 31 | import static jexer.TKeypress.kbDown; |
| 32 | import static jexer.TKeypress.kbEnd; |
| 33 | import static jexer.TKeypress.kbHome; |
| 34 | import static jexer.TKeypress.kbLeft; |
| 35 | import static jexer.TKeypress.kbPgDn; |
| 36 | import static jexer.TKeypress.kbPgUp; |
| 37 | import static jexer.TKeypress.kbRight; |
| 38 | import static jexer.TKeypress.kbUp; |
| 39 | |
| 40 | import java.util.LinkedList; |
| 41 | import java.util.List; |
| 42 | |
| 43 | import jexer.bits.CellAttributes; |
| 44 | import jexer.event.TKeypressEvent; |
| 45 | import jexer.event.TMouseEvent; |
| 46 | |
| 47 | /** |
| 48 | * TText implements a simple scrollable text area. It reflows automatically on |
| 49 | * resize. |
| 50 | */ |
| 51 | public final class TText extends TWidget { |
| 52 | |
| 53 | /** |
| 54 | * Text to display. |
| 55 | */ |
| 56 | private String text; |
| 57 | |
| 58 | /** |
| 59 | * Text converted to lines. |
| 60 | */ |
| 61 | private List<String> lines; |
| 62 | |
| 63 | /** |
| 64 | * Text color. |
| 65 | */ |
| 66 | private String colorKey; |
| 67 | |
| 68 | /** |
| 69 | * Vertical scrollbar. |
| 70 | */ |
| 71 | private TVScroller vScroller; |
| 72 | |
| 73 | /** |
| 74 | * Horizontal scrollbar. |
| 75 | */ |
| 76 | private THScroller hScroller; |
| 77 | |
| 78 | /** |
| 79 | * Maximum width of a single line. |
| 80 | */ |
| 81 | private int maxLineWidth; |
| 82 | |
| 83 | /** |
| 84 | * Number of lines between each paragraph. |
| 85 | */ |
| 86 | private int lineSpacing = 1; |
| 87 | |
| 88 | /** |
| 89 | * Convenience method used by TWindowLoggerOutput. |
| 90 | * |
| 91 | * @param line |
| 92 | * new line to add |
| 93 | */ |
| 94 | public void addLine(final String line) { |
| 95 | if (text.length() == 0) { |
| 96 | text = line; |
| 97 | } else { |
| 98 | text += "\n\n"; |
| 99 | text += line; |
| 100 | } |
| 101 | reflow(); |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * Recompute the bounds for the scrollbars. |
| 106 | */ |
| 107 | private void computeBounds() { |
| 108 | maxLineWidth = 0; |
| 109 | for (String line : lines) { |
| 110 | if (line.length() > maxLineWidth) { |
| 111 | maxLineWidth = line.length(); |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | vScroller.setBottomValue((lines.size() - getHeight()) + 1); |
| 116 | if (vScroller.getBottomValue() < 0) { |
| 117 | vScroller.setBottomValue(0); |
| 118 | } |
| 119 | if (vScroller.getValue() > vScroller.getBottomValue()) { |
| 120 | vScroller.setValue(vScroller.getBottomValue()); |
| 121 | } |
| 122 | |
| 123 | hScroller.setRightValue((maxLineWidth - getWidth()) + 1); |
| 124 | if (hScroller.getRightValue() < 0) { |
| 125 | hScroller.setRightValue(0); |
| 126 | } |
| 127 | if (hScroller.getValue() > hScroller.getRightValue()) { |
| 128 | hScroller.setValue(hScroller.getRightValue()); |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | /** |
| 133 | * Insert newlines into a string to wrap it to a maximum column. Terminate |
| 134 | * the final string with a newline. Note that interior newlines are |
| 135 | * converted to spaces. |
| 136 | * |
| 137 | * @param str |
| 138 | * the string |
| 139 | * @param n |
| 140 | * the maximum number of characters in a line |
| 141 | * @return the wrapped string |
| 142 | */ |
| 143 | private String wrap(final String str, final int n) { |
| 144 | assert (n > 0); |
| 145 | |
| 146 | StringBuilder sb = new StringBuilder(); |
| 147 | StringBuilder word = new StringBuilder(); |
| 148 | int col = 0; |
| 149 | for (int i = 0; i < str.length(); i++) { |
| 150 | char ch = str.charAt(i); |
| 151 | if (ch == '\n') { |
| 152 | ch = ' '; |
| 153 | } |
| 154 | if (ch == ' ') { |
| 155 | sb.append(word.toString()); |
| 156 | sb.append(ch); |
| 157 | if (word.length() >= (n - 1)) { |
| 158 | sb.append('\n'); |
| 159 | col = 0; |
| 160 | } |
| 161 | word = new StringBuilder(); |
| 162 | } else { |
| 163 | word.append(ch); |
| 164 | } |
| 165 | |
| 166 | col++; |
| 167 | if (col >= (n - 1)) { |
| 168 | sb.append('\n'); |
| 169 | col = 0; |
| 170 | } |
| 171 | } |
| 172 | sb.append(word.toString()); |
| 173 | sb.append('\n'); |
| 174 | return sb.toString(); |
| 175 | } |
| 176 | |
| 177 | /** |
| 178 | * Resize text and scrollbars for a new width/height. |
| 179 | */ |
| 180 | public void reflow() { |
| 181 | // Reset the lines |
| 182 | lines.clear(); |
| 183 | |
| 184 | // Break up text into paragraphs |
| 185 | String[] paragraphs = text.split("\n\n"); |
| 186 | for (String p : paragraphs) { |
| 187 | String paragraph = wrap(p, getWidth() - 1); |
| 188 | for (String line : paragraph.split("\n")) { |
| 189 | lines.add(line); |
| 190 | } |
| 191 | for (int i = 0; i < lineSpacing; i++) { |
| 192 | lines.add(""); |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | // Start at the top |
| 197 | if (vScroller == null) { |
| 198 | vScroller = new TVScroller(this, getWidth() - 1, 0, getHeight() - 1); |
| 199 | vScroller.setTopValue(0); |
| 200 | vScroller.setValue(0); |
| 201 | } else { |
| 202 | vScroller.setX(getWidth() - 1); |
| 203 | vScroller.setHeight(getHeight() - 1); |
| 204 | } |
| 205 | vScroller.setBigChange(getHeight() - 1); |
| 206 | |
| 207 | // Start at the left |
| 208 | if (hScroller == null) { |
| 209 | hScroller = new THScroller(this, 0, getHeight() - 1, getWidth() - 1); |
| 210 | hScroller.setLeftValue(0); |
| 211 | hScroller.setValue(0); |
| 212 | } else { |
| 213 | hScroller.setY(getHeight() - 1); |
| 214 | hScroller.setWidth(getWidth() - 1); |
| 215 | } |
| 216 | hScroller.setBigChange(getWidth() - 1); |
| 217 | |
| 218 | computeBounds(); |
| 219 | } |
| 220 | |
| 221 | /** |
| 222 | * Public constructor. |
| 223 | * |
| 224 | * @param parent |
| 225 | * parent widget |
| 226 | * @param text |
| 227 | * text on the screen |
| 228 | * @param x |
| 229 | * column relative to parent |
| 230 | * @param y |
| 231 | * row relative to parent |
| 232 | * @param width |
| 233 | * width of text area |
| 234 | * @param height |
| 235 | * height of text area |
| 236 | */ |
| 237 | public TText(final TWidget parent, final String text, final int x, |
| 238 | final int y, final int width, final int height) { |
| 239 | |
| 240 | this(parent, text, x, y, width, height, "ttext"); |
| 241 | } |
| 242 | |
| 243 | /** |
| 244 | * Public constructor. |
| 245 | * |
| 246 | * @param parent |
| 247 | * parent widget |
| 248 | * @param text |
| 249 | * text on the screen |
| 250 | * @param x |
| 251 | * column relative to parent |
| 252 | * @param y |
| 253 | * row relative to parent |
| 254 | * @param width |
| 255 | * width of text area |
| 256 | * @param height |
| 257 | * height of text area |
| 258 | * @param colorKey |
| 259 | * ColorTheme key color to use for foreground text. Default is |
| 260 | * "ttext" |
| 261 | */ |
| 262 | public TText(final TWidget parent, final String text, final int x, |
| 263 | final int y, final int width, final int height, |
| 264 | final String colorKey) { |
| 265 | |
| 266 | // Set parent and window |
| 267 | super(parent, x, y, width, height); |
| 268 | |
| 269 | this.text = text; |
| 270 | this.colorKey = colorKey; |
| 271 | |
| 272 | lines = new LinkedList<String>(); |
| 273 | |
| 274 | reflow(); |
| 275 | } |
| 276 | |
| 277 | /** |
| 278 | * Draw the text box. |
| 279 | */ |
| 280 | @Override |
| 281 | public void draw() { |
| 282 | // Setup my color |
| 283 | CellAttributes color = getTheme().getColor(colorKey); |
| 284 | |
| 285 | int begin = vScroller.getValue(); |
| 286 | int topY = 0; |
| 287 | for (int i = begin; i < lines.size(); i++) { |
| 288 | String line = lines.get(i); |
| 289 | if (hScroller.getValue() < line.length()) { |
| 290 | line = line.substring(hScroller.getValue()); |
| 291 | } else { |
| 292 | line = ""; |
| 293 | } |
| 294 | String formatString = "%-" + Integer.toString(getWidth() - 1) + "s"; |
| 295 | getScreen().putStringXY(0, topY, String.format(formatString, line), |
| 296 | color); |
| 297 | topY++; |
| 298 | |
| 299 | if (topY >= (getHeight() - 1)) { |
| 300 | break; |
| 301 | } |
| 302 | } |
| 303 | |
| 304 | // Pad the rest with blank lines |
| 305 | for (int i = topY; i < (getHeight() - 1); i++) { |
| 306 | getScreen().hLineXY(0, i, getWidth() - 1, ' ', color); |
| 307 | } |
| 308 | |
| 309 | } |
| 310 | |
| 311 | /** |
| 312 | * Handle mouse press events. |
| 313 | * |
| 314 | * @param mouse |
| 315 | * mouse button press event |
| 316 | */ |
| 317 | @Override |
| 318 | public void onMouseDown(final TMouseEvent mouse) { |
| 319 | if (mouse.isMouseWheelUp()) { |
| 320 | vScroller.decrement(); |
| 321 | return; |
| 322 | } |
| 323 | if (mouse.isMouseWheelDown()) { |
| 324 | vScroller.increment(); |
| 325 | return; |
| 326 | } |
| 327 | |
| 328 | // Pass to children |
| 329 | super.onMouseDown(mouse); |
| 330 | } |
| 331 | |
| 332 | /** |
| 333 | * Handle keystrokes. |
| 334 | * |
| 335 | * @param keypress |
| 336 | * keystroke event |
| 337 | */ |
| 338 | @Override |
| 339 | public void onKeypress(final TKeypressEvent keypress) { |
| 340 | if (keypress.equals(kbLeft)) { |
| 341 | hScroller.decrement(); |
| 342 | } else if (keypress.equals(kbRight)) { |
| 343 | hScroller.increment(); |
| 344 | } else if (keypress.equals(kbUp)) { |
| 345 | vScroller.decrement(); |
| 346 | } else if (keypress.equals(kbDown)) { |
| 347 | vScroller.increment(); |
| 348 | } else if (keypress.equals(kbPgUp)) { |
| 349 | vScroller.bigDecrement(); |
| 350 | } else if (keypress.equals(kbPgDn)) { |
| 351 | vScroller.bigIncrement(); |
| 352 | } else if (keypress.equals(kbHome)) { |
| 353 | vScroller.toTop(); |
| 354 | } else if (keypress.equals(kbEnd)) { |
| 355 | vScroller.toBottom(); |
| 356 | } else { |
| 357 | // Pass other keys (tab etc.) on |
| 358 | super.onKeypress(keypress); |
| 359 | } |
| 360 | } |
| 361 | |
| 362 | } |