| 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 java.util.ArrayList; |
| 34 | import java.util.List; |
| 35 | |
| 36 | import jexer.bits.CellAttributes; |
| 37 | import jexer.event.TKeypressEvent; |
| 38 | import jexer.event.TMouseEvent; |
| 39 | import static jexer.TKeypress.*; |
| 40 | |
| 41 | /** |
| 42 | * TList shows a list of strings, and lets the user select one. |
| 43 | */ |
| 44 | public class TList extends TWidget { |
| 45 | |
| 46 | /** |
| 47 | * The list of strings to display. |
| 48 | */ |
| 49 | private List<String> strings; |
| 50 | |
| 51 | /** |
| 52 | * Selected string. |
| 53 | */ |
| 54 | private int selectedString = -1; |
| 55 | |
| 56 | /** |
| 57 | * Get the selection index. |
| 58 | * |
| 59 | * @return -1 if nothing is selected, otherwise the index into the list |
| 60 | */ |
| 61 | public final int getSelectedIndex() { |
| 62 | return selectedString; |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * Set the selected string index. |
| 67 | * |
| 68 | * @param index -1 to unselect, otherwise the index into the list |
| 69 | */ |
| 70 | public final void setSelectedIndex(final int index) { |
| 71 | selectedString = index; |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * Get the selected string. |
| 76 | * |
| 77 | * @return the selected string, or null of nothing is selected yet |
| 78 | */ |
| 79 | public final String getSelected() { |
| 80 | if ((selectedString >= 0) && (selectedString <= strings.size() - 1)) { |
| 81 | return strings.get(selectedString); |
| 82 | } |
| 83 | return null; |
| 84 | } |
| 85 | |
| 86 | /** |
| 87 | * Set the new list of strings to display. |
| 88 | * |
| 89 | * @param list new list of strings |
| 90 | */ |
| 91 | public final void setList(final List<String> list) { |
| 92 | strings.clear(); |
| 93 | strings.addAll(list); |
| 94 | reflow(); |
| 95 | } |
| 96 | |
| 97 | /** |
| 98 | * Vertical scrollbar. |
| 99 | */ |
| 100 | private TVScroller vScroller; |
| 101 | |
| 102 | /** |
| 103 | * Get the vertical scrollbar. This is used by subclasses. |
| 104 | * |
| 105 | * @return the vertical scrollbar |
| 106 | */ |
| 107 | public final TVScroller getVScroller() { |
| 108 | return vScroller; |
| 109 | } |
| 110 | |
| 111 | /** |
| 112 | * Horizontal scrollbar. |
| 113 | */ |
| 114 | private THScroller hScroller; |
| 115 | |
| 116 | /** |
| 117 | * Get the horizontal scrollbar. This is used by subclasses. |
| 118 | * |
| 119 | * @return the horizontal scrollbar |
| 120 | */ |
| 121 | public final THScroller getHScroller() { |
| 122 | return hScroller; |
| 123 | } |
| 124 | |
| 125 | /** |
| 126 | * Maximum width of a single line. |
| 127 | */ |
| 128 | private int maxLineWidth; |
| 129 | |
| 130 | /** |
| 131 | * The action to perform when the user selects an item (clicks or enter). |
| 132 | */ |
| 133 | private TAction enterAction = null; |
| 134 | |
| 135 | /** |
| 136 | * The action to perform when the user navigates with keyboard. |
| 137 | */ |
| 138 | private TAction moveAction = null; |
| 139 | |
| 140 | /** |
| 141 | * Perform user selection action. |
| 142 | */ |
| 143 | public void dispatchEnter() { |
| 144 | assert (selectedString >= 0); |
| 145 | assert (selectedString < strings.size()); |
| 146 | if (enterAction != null) { |
| 147 | enterAction.DO(); |
| 148 | } |
| 149 | } |
| 150 | |
| 151 | /** |
| 152 | * Perform list movement action. |
| 153 | */ |
| 154 | public void dispatchMove() { |
| 155 | assert (selectedString >= 0); |
| 156 | assert (selectedString < strings.size()); |
| 157 | if (moveAction != null) { |
| 158 | moveAction.DO(); |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | /** |
| 163 | * Resize for a new width/height. |
| 164 | */ |
| 165 | public void reflow() { |
| 166 | |
| 167 | // Reset the lines |
| 168 | selectedString = -1; |
| 169 | maxLineWidth = 0; |
| 170 | |
| 171 | for (int i = 0; i < strings.size(); i++) { |
| 172 | String line = strings.get(i); |
| 173 | if (line.length() > maxLineWidth) { |
| 174 | maxLineWidth = line.length(); |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | // Start at the top |
| 179 | if (vScroller == null) { |
| 180 | vScroller = new TVScroller(this, getWidth() - 1, 0, |
| 181 | getHeight() - 1); |
| 182 | } else { |
| 183 | vScroller.setX(getWidth() - 1); |
| 184 | vScroller.setHeight(getHeight() - 1); |
| 185 | } |
| 186 | vScroller.setBottomValue(strings.size() - getHeight() + 1); |
| 187 | vScroller.setTopValue(0); |
| 188 | vScroller.setValue(0); |
| 189 | if (vScroller.getBottomValue() < 0) { |
| 190 | vScroller.setBottomValue(0); |
| 191 | } |
| 192 | vScroller.setBigChange(getHeight() - 1); |
| 193 | |
| 194 | // Start at the left |
| 195 | if (hScroller == null) { |
| 196 | hScroller = new THScroller(this, 0, getHeight() - 1, |
| 197 | getWidth() - 1); |
| 198 | } else { |
| 199 | hScroller.setY(getHeight() - 1); |
| 200 | hScroller.setWidth(getWidth() - 1); |
| 201 | } |
| 202 | hScroller.setRightValue(maxLineWidth - getWidth() + 1); |
| 203 | hScroller.setLeftValue(0); |
| 204 | hScroller.setValue(0); |
| 205 | if (hScroller.getRightValue() < 0) { |
| 206 | hScroller.setRightValue(0); |
| 207 | } |
| 208 | hScroller.setBigChange(getWidth() - 1); |
| 209 | } |
| 210 | |
| 211 | /** |
| 212 | * Public constructor. |
| 213 | * |
| 214 | * @param parent parent widget |
| 215 | * @param strings list of strings to show |
| 216 | * @param x column relative to parent |
| 217 | * @param y row relative to parent |
| 218 | * @param width width of text area |
| 219 | * @param height height of text area |
| 220 | */ |
| 221 | public TList(final TWidget parent, final List<String> strings, final int x, |
| 222 | final int y, final int width, final int height) { |
| 223 | |
| 224 | this(parent, strings, x, y, width, height, null); |
| 225 | } |
| 226 | |
| 227 | /** |
| 228 | * Public constructor. |
| 229 | * |
| 230 | * @param parent parent widget |
| 231 | * @param strings list of strings to show. This is allowed to be null |
| 232 | * and set later with setList() or by subclasses. |
| 233 | * @param x column relative to parent |
| 234 | * @param y row relative to parent |
| 235 | * @param width width of text area |
| 236 | * @param height height of text area |
| 237 | * @param enterAction action to perform when an item is selected |
| 238 | */ |
| 239 | public TList(final TWidget parent, final List<String> strings, final int x, |
| 240 | final int y, final int width, final int height, |
| 241 | final TAction enterAction) { |
| 242 | |
| 243 | super(parent, x, y, width, height); |
| 244 | this.enterAction = enterAction; |
| 245 | this.strings = new ArrayList<String>(); |
| 246 | if (strings != null) { |
| 247 | this.strings.addAll(strings); |
| 248 | } |
| 249 | reflow(); |
| 250 | } |
| 251 | |
| 252 | /** |
| 253 | * Public constructor. |
| 254 | * |
| 255 | * @param parent parent widget |
| 256 | * @param strings list of strings to show. This is allowed to be null |
| 257 | * and set later with setList() or by subclasses. |
| 258 | * @param x column relative to parent |
| 259 | * @param y row relative to parent |
| 260 | * @param width width of text area |
| 261 | * @param height height of text area |
| 262 | * @param enterAction action to perform when an item is selected |
| 263 | * @param moveAction action to perform when the user navigates to a new |
| 264 | * item with arrow/page keys |
| 265 | */ |
| 266 | public TList(final TWidget parent, final List<String> strings, final int x, |
| 267 | final int y, final int width, final int height, |
| 268 | final TAction enterAction, final TAction moveAction) { |
| 269 | |
| 270 | super(parent, x, y, width, height); |
| 271 | this.enterAction = enterAction; |
| 272 | this.moveAction = moveAction; |
| 273 | this.strings = new ArrayList<String>(); |
| 274 | if (strings != null) { |
| 275 | this.strings.addAll(strings); |
| 276 | } |
| 277 | reflow(); |
| 278 | } |
| 279 | |
| 280 | /** |
| 281 | * Draw the files list. |
| 282 | */ |
| 283 | @Override |
| 284 | public void draw() { |
| 285 | CellAttributes color = null; |
| 286 | int begin = vScroller.getValue(); |
| 287 | int topY = 0; |
| 288 | for (int i = begin; i < strings.size(); i++) { |
| 289 | String line = strings.get(i); |
| 290 | if (hScroller.getValue() < line.length()) { |
| 291 | line = line.substring(hScroller.getValue()); |
| 292 | } else { |
| 293 | line = ""; |
| 294 | } |
| 295 | if (i == selectedString) { |
| 296 | color = getTheme().getColor("tlist.selected"); |
| 297 | } else if (isAbsoluteActive()) { |
| 298 | color = getTheme().getColor("tlist"); |
| 299 | } else { |
| 300 | color = getTheme().getColor("tlist.inactive"); |
| 301 | } |
| 302 | String formatString = "%-" + Integer.toString(getWidth() - 1) + "s"; |
| 303 | getScreen().putStringXY(0, topY, String.format(formatString, line), |
| 304 | color); |
| 305 | topY++; |
| 306 | if (topY >= getHeight() - 1) { |
| 307 | break; |
| 308 | } |
| 309 | } |
| 310 | |
| 311 | if (isAbsoluteActive()) { |
| 312 | color = getTheme().getColor("tlist"); |
| 313 | } else { |
| 314 | color = getTheme().getColor("tlist.inactive"); |
| 315 | } |
| 316 | |
| 317 | // Pad the rest with blank lines |
| 318 | for (int i = topY; i < getHeight() - 1; i++) { |
| 319 | getScreen().hLineXY(0, i, getWidth() - 1, ' ', color); |
| 320 | } |
| 321 | } |
| 322 | |
| 323 | /** |
| 324 | * Handle mouse press events. |
| 325 | * |
| 326 | * @param mouse mouse button press event |
| 327 | */ |
| 328 | @Override |
| 329 | public void onMouseDown(final TMouseEvent mouse) { |
| 330 | if (mouse.isMouseWheelUp()) { |
| 331 | vScroller.decrement(); |
| 332 | return; |
| 333 | } |
| 334 | if (mouse.isMouseWheelDown()) { |
| 335 | vScroller.increment(); |
| 336 | return; |
| 337 | } |
| 338 | |
| 339 | if ((mouse.getX() < getWidth() - 1) |
| 340 | && (mouse.getY() < getHeight() - 1)) { |
| 341 | if (vScroller.getValue() + mouse.getY() < strings.size()) { |
| 342 | selectedString = vScroller.getValue() + mouse.getY(); |
| 343 | } |
| 344 | dispatchEnter(); |
| 345 | return; |
| 346 | } |
| 347 | |
| 348 | // Pass to children |
| 349 | super.onMouseDown(mouse); |
| 350 | } |
| 351 | |
| 352 | /** |
| 353 | * Handle keystrokes. |
| 354 | * |
| 355 | * @param keypress keystroke event |
| 356 | */ |
| 357 | @Override |
| 358 | public void onKeypress(final TKeypressEvent keypress) { |
| 359 | if (keypress.equals(kbLeft)) { |
| 360 | hScroller.decrement(); |
| 361 | } else if (keypress.equals(kbRight)) { |
| 362 | hScroller.increment(); |
| 363 | } else if (keypress.equals(kbUp)) { |
| 364 | if (strings.size() > 0) { |
| 365 | if (selectedString >= 0) { |
| 366 | if (selectedString > 0) { |
| 367 | if (selectedString - vScroller.getValue() == 0) { |
| 368 | vScroller.decrement(); |
| 369 | } |
| 370 | selectedString--; |
| 371 | } |
| 372 | } else { |
| 373 | selectedString = strings.size() - 1; |
| 374 | } |
| 375 | } |
| 376 | if (selectedString >= 0) { |
| 377 | dispatchMove(); |
| 378 | } |
| 379 | } else if (keypress.equals(kbDown)) { |
| 380 | if (strings.size() > 0) { |
| 381 | if (selectedString >= 0) { |
| 382 | if (selectedString < strings.size() - 1) { |
| 383 | selectedString++; |
| 384 | if (selectedString - vScroller.getValue() == getHeight() - 1) { |
| 385 | vScroller.increment(); |
| 386 | } |
| 387 | } |
| 388 | } else { |
| 389 | selectedString = 0; |
| 390 | } |
| 391 | } |
| 392 | if (selectedString >= 0) { |
| 393 | dispatchMove(); |
| 394 | } |
| 395 | } else if (keypress.equals(kbPgUp)) { |
| 396 | vScroller.bigDecrement(); |
| 397 | if (selectedString >= 0) { |
| 398 | selectedString -= getHeight() - 1; |
| 399 | if (selectedString < 0) { |
| 400 | selectedString = 0; |
| 401 | } |
| 402 | } |
| 403 | if (selectedString >= 0) { |
| 404 | dispatchMove(); |
| 405 | } |
| 406 | } else if (keypress.equals(kbPgDn)) { |
| 407 | vScroller.bigIncrement(); |
| 408 | if (selectedString >= 0) { |
| 409 | selectedString += getHeight() - 1; |
| 410 | if (selectedString > strings.size() - 1) { |
| 411 | selectedString = strings.size() - 1; |
| 412 | } |
| 413 | } |
| 414 | if (selectedString >= 0) { |
| 415 | dispatchMove(); |
| 416 | } |
| 417 | } else if (keypress.equals(kbHome)) { |
| 418 | vScroller.toTop(); |
| 419 | if (strings.size() > 0) { |
| 420 | selectedString = 0; |
| 421 | } |
| 422 | if (selectedString >= 0) { |
| 423 | dispatchMove(); |
| 424 | } |
| 425 | } else if (keypress.equals(kbEnd)) { |
| 426 | vScroller.toBottom(); |
| 427 | if (strings.size() > 0) { |
| 428 | selectedString = strings.size() - 1; |
| 429 | } |
| 430 | if (selectedString >= 0) { |
| 431 | dispatchMove(); |
| 432 | } |
| 433 | } else if (keypress.equals(kbTab)) { |
| 434 | getParent().switchWidget(true); |
| 435 | } else if (keypress.equals(kbShiftTab) || keypress.equals(kbBackTab)) { |
| 436 | getParent().switchWidget(false); |
| 437 | } else if (keypress.equals(kbEnter)) { |
| 438 | if (selectedString >= 0) { |
| 439 | dispatchEnter(); |
| 440 | } |
| 441 | } else { |
| 442 | // Pass other keys (tab etc.) on |
| 443 | super.onKeypress(keypress); |
| 444 | } |
| 445 | } |
| 446 | |
| 447 | } |