| 1 | /** |
| 2 | * Jexer - Java Text User Interface - demonstration program |
| 3 | * |
| 4 | * Version: $Id$ |
| 5 | * |
| 6 | * Author: Kevin Lamonte, <a href="mailto:kevin.lamonte@gmail.com">kevin.lamonte@gmail.com</a> |
| 7 | * |
| 8 | * License: LGPLv3 or later |
| 9 | * |
| 10 | * Copyright: This module is licensed under the GNU Lesser General |
| 11 | * Public License Version 3. Please see the file "COPYING" in this |
| 12 | * directory for more information about the GNU Lesser General Public |
| 13 | * License Version 3. |
| 14 | * |
| 15 | * Copyright (C) 2015 Kevin Lamonte |
| 16 | * |
| 17 | * This program is free software; you can redistribute it and/or |
| 18 | * modify it under the terms of the GNU Lesser General Public License |
| 19 | * as published by the Free Software Foundation; either version 3 of |
| 20 | * the License, or (at your option) any later version. |
| 21 | * |
| 22 | * This program is distributed in the hope that it will be useful, but |
| 23 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 24 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 25 | * General Public License for more details. |
| 26 | * |
| 27 | * You should have received a copy of the GNU Lesser General Public |
| 28 | * License along with this program; if not, see |
| 29 | * http://www.gnu.org/licenses/, or write to the Free Software |
| 30 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA |
| 31 | * 02110-1301 USA |
| 32 | */ |
| 33 | package jexer; |
| 34 | |
| 35 | import java.io.InputStream; |
| 36 | import java.io.OutputStream; |
| 37 | import java.io.UnsupportedEncodingException; |
| 38 | import java.util.LinkedList; |
| 39 | import java.util.List; |
| 40 | |
| 41 | import jexer.bits.CellAttributes; |
| 42 | import jexer.bits.ColorTheme; |
| 43 | import jexer.bits.GraphicsChars; |
| 44 | import jexer.event.TCommandEvent; |
| 45 | import jexer.event.TInputEvent; |
| 46 | import jexer.event.TKeypressEvent; |
| 47 | import jexer.event.TMouseEvent; |
| 48 | import jexer.event.TResizeEvent; |
| 49 | import jexer.backend.Backend; |
| 50 | import jexer.backend.ECMA48Backend; |
| 51 | import static jexer.TCommand.*; |
| 52 | import static jexer.TKeypress.*; |
| 53 | |
| 54 | /** |
| 55 | * TApplication sets up a full Text User Interface application. |
| 56 | */ |
| 57 | public class TApplication { |
| 58 | |
| 59 | /** |
| 60 | * Access to the physical screen, keyboard, and mouse. |
| 61 | */ |
| 62 | public Backend backend; |
| 63 | |
| 64 | /** |
| 65 | * Actual mouse coordinate X |
| 66 | */ |
| 67 | private int mouseX; |
| 68 | |
| 69 | /** |
| 70 | * Actual mouse coordinate Y |
| 71 | */ |
| 72 | private int mouseY; |
| 73 | |
| 74 | /** |
| 75 | * Event queue that will be drained by either primary or secondary Fiber |
| 76 | */ |
| 77 | private List<TInputEvent> eventQueue; |
| 78 | |
| 79 | /** |
| 80 | * Windows and widgets pull colors from this ColorTheme. |
| 81 | */ |
| 82 | public ColorTheme theme; |
| 83 | |
| 84 | /** |
| 85 | * When true, exit the application. |
| 86 | */ |
| 87 | public boolean quit = false; |
| 88 | |
| 89 | /** |
| 90 | * When true, repaint the entire screen. |
| 91 | */ |
| 92 | public boolean repaint = true; |
| 93 | |
| 94 | /** |
| 95 | * When true, just flush updates from the screen. |
| 96 | */ |
| 97 | public boolean flush = false; |
| 98 | |
| 99 | /** |
| 100 | * Y coordinate of the top edge of the desktop. |
| 101 | */ |
| 102 | static public final int desktopTop = 1; |
| 103 | |
| 104 | /** |
| 105 | * Y coordinate of the bottom edge of the desktop. |
| 106 | */ |
| 107 | public int desktopBottom; |
| 108 | |
| 109 | /** |
| 110 | * Public constructor. |
| 111 | * |
| 112 | * @param input an InputStream connected to the remote user, or null for |
| 113 | * System.in. If System.in is used, then on non-Windows systems it will |
| 114 | * be put in raw mode; shutdown() will (blindly!) put System.in in cooked |
| 115 | * mode. input is always converted to a Reader with UTF-8 encoding. |
| 116 | * @param output an OutputStream connected to the remote user, or null |
| 117 | * for System.out. output is always converted to a Writer with UTF-8 |
| 118 | * encoding. |
| 119 | */ |
| 120 | public TApplication(InputStream input, OutputStream output) throws UnsupportedEncodingException { |
| 121 | |
| 122 | backend = new ECMA48Backend(input, output); |
| 123 | theme = new ColorTheme(); |
| 124 | desktopBottom = backend.screen.getHeight() - 1; |
| 125 | eventQueue = new LinkedList<TInputEvent>(); |
| 126 | } |
| 127 | |
| 128 | /** |
| 129 | * Invert the cell at the mouse pointer position. |
| 130 | */ |
| 131 | private void drawMouse() { |
| 132 | CellAttributes attr = backend.screen.getAttrXY(mouseX, mouseY); |
| 133 | attr.foreColor = attr.foreColor.invert(); |
| 134 | attr.backColor = attr.backColor.invert(); |
| 135 | backend.screen.putAttrXY(mouseX, mouseY, attr, false); |
| 136 | flush = true; |
| 137 | |
| 138 | /* |
| 139 | if (windows.length == 0) { |
| 140 | repaint = true; |
| 141 | } |
| 142 | */ |
| 143 | // TODO: remove this repaint after the above if (windows.length == 0) |
| 144 | // can be used again. |
| 145 | repaint = true; |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * Draw everything. |
| 150 | */ |
| 151 | final public void drawAll() { |
| 152 | if ((flush) && (!repaint)) { |
| 153 | backend.flushScreen(); |
| 154 | flush = false; |
| 155 | return; |
| 156 | } |
| 157 | |
| 158 | if (!repaint) { |
| 159 | return; |
| 160 | } |
| 161 | |
| 162 | // If true, the cursor is not visible |
| 163 | boolean cursor = false; |
| 164 | |
| 165 | // Start with a clean screen |
| 166 | backend.screen.clear(); |
| 167 | |
| 168 | // Draw the background |
| 169 | CellAttributes background = theme.getColor("tapplication.background"); |
| 170 | backend.screen.putAll(GraphicsChars.HATCH, background); |
| 171 | |
| 172 | /* |
| 173 | // Draw each window in reverse Z order |
| 174 | TWindow [] sorted = windows.dup; |
| 175 | sorted.sort.reverse; |
| 176 | foreach (w; sorted) { |
| 177 | w.drawChildren(); |
| 178 | } |
| 179 | |
| 180 | // Draw the blank menubar line - reset the screen clipping first so |
| 181 | // it won't trim it out. |
| 182 | backend.screen.resetClipping(); |
| 183 | backend.screen.hLineXY(0, 0, backend.screen.getWidth(), ' ', |
| 184 | theme.getColor("tmenu")); |
| 185 | // Now draw the menus. |
| 186 | int x = 1; |
| 187 | foreach (m; menus) { |
| 188 | CellAttributes menuColor; |
| 189 | CellAttributes menuMnemonicColor; |
| 190 | if (m.active) { |
| 191 | menuColor = theme.getColor("tmenu.highlighted"); |
| 192 | menuMnemonicColor = theme.getColor("tmenu.mnemonic.highlighted"); |
| 193 | } else { |
| 194 | menuColor = theme.getColor("tmenu"); |
| 195 | menuMnemonicColor = theme.getColor("tmenu.mnemonic"); |
| 196 | } |
| 197 | // Draw the menu title |
| 198 | backend.screen.hLineXY(x, 0, cast(int)m.title.length + 2, ' ', |
| 199 | menuColor); |
| 200 | backend.screen.putStrXY(x + 1, 0, m.title, menuColor); |
| 201 | // Draw the highlight character |
| 202 | backend.screen.putCharXY(x + 1 + m.mnemonic.shortcutIdx, 0, |
| 203 | m.mnemonic.shortcut, menuMnemonicColor); |
| 204 | |
| 205 | if (m.active) { |
| 206 | m.drawChildren(); |
| 207 | // Reset the screen clipping so we can draw the next title. |
| 208 | backend.screen.resetClipping(); |
| 209 | } |
| 210 | x += m.title.length + 2; |
| 211 | } |
| 212 | |
| 213 | foreach (m; subMenus) { |
| 214 | // Reset the screen clipping so we can draw the next sub-menu. |
| 215 | backend.screen.resetClipping(); |
| 216 | m.drawChildren(); |
| 217 | } |
| 218 | */ |
| 219 | |
| 220 | // Draw the mouse pointer |
| 221 | drawMouse(); |
| 222 | |
| 223 | /* |
| 224 | // Place the cursor if it is visible |
| 225 | TWidget activeWidget = null; |
| 226 | if (sorted.length > 0) { |
| 227 | activeWidget = sorted[$ - 1].getActiveChild(); |
| 228 | if (activeWidget.hasCursor) { |
| 229 | backend.screen.putCursor(true, activeWidget.getCursorAbsoluteX(), |
| 230 | activeWidget.getCursorAbsoluteY()); |
| 231 | cursor = true; |
| 232 | } |
| 233 | } |
| 234 | |
| 235 | // Kill the cursor |
| 236 | if (cursor == false) { |
| 237 | backend.screen.hideCursor(); |
| 238 | } |
| 239 | */ |
| 240 | |
| 241 | // Flush the screen contents |
| 242 | backend.flushScreen(); |
| 243 | |
| 244 | repaint = false; |
| 245 | flush = false; |
| 246 | } |
| 247 | |
| 248 | /** |
| 249 | * Run this application until it exits, using stdin and stdout |
| 250 | */ |
| 251 | public final void run() { |
| 252 | |
| 253 | while (quit == false) { |
| 254 | // Timeout is in milliseconds, so default timeout after 1 second |
| 255 | // of inactivity. |
| 256 | int timeout = getSleepTime(1000); |
| 257 | // std.stdio.stderr.writefln("poll() timeout: %d", timeout); |
| 258 | |
| 259 | if (eventQueue.size() > 0) { |
| 260 | // Do not wait if there are definitely events waiting to be |
| 261 | // processed or a screen redraw to do. |
| 262 | timeout = 0; |
| 263 | } |
| 264 | |
| 265 | // Pull any pending input events |
| 266 | List<TInputEvent> events = backend.getEvents(timeout); |
| 267 | metaHandleEvents(events); |
| 268 | |
| 269 | // Process timers and call doIdle()'s |
| 270 | doIdle(); |
| 271 | |
| 272 | // Update the screen |
| 273 | drawAll(); |
| 274 | } |
| 275 | |
| 276 | /* |
| 277 | |
| 278 | // Shutdown the fibers |
| 279 | eventQueue.length = 0; |
| 280 | if (secondaryEventFiber !is null) { |
| 281 | assert(secondaryEventReceiver !is null); |
| 282 | secondaryEventReceiver = null; |
| 283 | if (secondaryEventFiber.state == Fiber.State.HOLD) { |
| 284 | // Wake up the secondary handler so that it can exit. |
| 285 | secondaryEventFiber.call(); |
| 286 | } |
| 287 | } |
| 288 | |
| 289 | if (primaryEventFiber.state == Fiber.State.HOLD) { |
| 290 | // Wake up the primary handler so that it can exit. |
| 291 | primaryEventFiber.call(); |
| 292 | } |
| 293 | */ |
| 294 | |
| 295 | backend.shutdown(); |
| 296 | } |
| 297 | |
| 298 | /** |
| 299 | * Peek at certain application-level events, add to eventQueue, and wake |
| 300 | * up the consuming Fiber. |
| 301 | * |
| 302 | * @param events the input events to consume |
| 303 | */ |
| 304 | private void metaHandleEvents(List<TInputEvent> events) { |
| 305 | |
| 306 | for (TInputEvent event: events) { |
| 307 | |
| 308 | /* |
| 309 | System.err.printf(String.format("metaHandleEvents event: %s\n", |
| 310 | event)); System.err.flush(); |
| 311 | */ |
| 312 | |
| 313 | if (quit == true) { |
| 314 | // Do no more processing if the application is already trying |
| 315 | // to exit. |
| 316 | return; |
| 317 | } |
| 318 | |
| 319 | // DEBUG |
| 320 | if (event instanceof TKeypressEvent) { |
| 321 | TKeypressEvent keypress = (TKeypressEvent)event; |
| 322 | if (keypress.key.equals(kbAltX)) { |
| 323 | quit = true; |
| 324 | return; |
| 325 | } |
| 326 | } |
| 327 | // DEBUG |
| 328 | |
| 329 | // Special application-wide events ------------------------------- |
| 330 | |
| 331 | // Abort everything |
| 332 | if (event instanceof TCommandEvent) { |
| 333 | TCommandEvent command = (TCommandEvent)event; |
| 334 | if (command.cmd.equals(cmAbort)) { |
| 335 | quit = true; |
| 336 | return; |
| 337 | } |
| 338 | } |
| 339 | |
| 340 | // Screen resize |
| 341 | if (event instanceof TResizeEvent) { |
| 342 | TResizeEvent resize = (TResizeEvent)event; |
| 343 | backend.screen.setDimensions(resize.width, resize.height); |
| 344 | desktopBottom = backend.screen.getHeight() - 1; |
| 345 | repaint = true; |
| 346 | mouseX = 0; |
| 347 | mouseY = 0; |
| 348 | continue; |
| 349 | } |
| 350 | |
| 351 | // Peek at the mouse position |
| 352 | if (event instanceof TMouseEvent) { |
| 353 | TMouseEvent mouse = (TMouseEvent)event; |
| 354 | if ((mouseX != mouse.x) || (mouseY != mouse.y)) { |
| 355 | mouseX = mouse.x; |
| 356 | mouseY = mouse.y; |
| 357 | drawMouse(); |
| 358 | } |
| 359 | } |
| 360 | |
| 361 | /* |
| 362 | |
| 363 | // Put into the main queue |
| 364 | addEvent(event); |
| 365 | |
| 366 | // Have one of the two consumer Fibers peel the events off |
| 367 | // the queue. |
| 368 | if (secondaryEventFiber !is null) { |
| 369 | assert(secondaryEventFiber.state == Fiber.State.HOLD); |
| 370 | |
| 371 | // Wake up the secondary handler for these events |
| 372 | secondaryEventFiber.call(); |
| 373 | } else { |
| 374 | assert(primaryEventFiber.state == Fiber.State.HOLD); |
| 375 | |
| 376 | // Wake up the primary handler for these events |
| 377 | primaryEventFiber.call(); |
| 378 | } |
| 379 | */ |
| 380 | |
| 381 | } // for (TInputEvent event: events) |
| 382 | |
| 383 | } |
| 384 | |
| 385 | /** |
| 386 | * Do stuff when there is no user input. |
| 387 | */ |
| 388 | private void doIdle() { |
| 389 | /* |
| 390 | // Now run any timers that have timed out |
| 391 | auto now = Clock.currTime; |
| 392 | TTimer [] keepTimers; |
| 393 | foreach (t; timers) { |
| 394 | if (t.nextTick < now) { |
| 395 | t.tick(); |
| 396 | if (t.recurring == true) { |
| 397 | keepTimers ~= t; |
| 398 | } |
| 399 | } else { |
| 400 | keepTimers ~= t; |
| 401 | } |
| 402 | } |
| 403 | timers = keepTimers; |
| 404 | |
| 405 | // Call onIdle's |
| 406 | foreach (w; windows) { |
| 407 | w.onIdle(); |
| 408 | } |
| 409 | */ |
| 410 | } |
| 411 | |
| 412 | /** |
| 413 | * Get the amount of time I can sleep before missing a Timer tick. |
| 414 | * |
| 415 | * @param timeout = initial (maximum) timeout |
| 416 | * @return number of milliseconds between now and the next timer event |
| 417 | */ |
| 418 | protected int getSleepTime(int timeout) { |
| 419 | /* |
| 420 | auto now = Clock.currTime; |
| 421 | auto sleepTime = dur!("msecs")(timeout); |
| 422 | foreach (t; timers) { |
| 423 | if (t.nextTick < now) { |
| 424 | return 0; |
| 425 | } |
| 426 | if ((t.nextTick > now) && |
| 427 | ((t.nextTick - now) < sleepTime) |
| 428 | ) { |
| 429 | sleepTime = t.nextTick - now; |
| 430 | } |
| 431 | } |
| 432 | assert(sleepTime.total!("msecs")() >= 0); |
| 433 | return cast(uint)sleepTime.total!("msecs")(); |
| 434 | */ |
| 435 | return 0; |
| 436 | } |
| 437 | |
| 438 | } |