TIN: src/global.c

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Member "tin-2.6.1/src/global.c" (22 Dec 2021, 9216 Bytes) of package /linux/misc/tin-2.6.1.tar.xz:

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1 /* 2 * Project : tin - a Usenet reader 3 * Module : global.c 4 * Author : Jason Faultless <jason@altarstone.com> 5 * Created : 1999-12-12 6 * Updated : 2021-02-23 7 * Notes : Generic navigation and key handling routines 8 * 9 * Copyright (c) 1999-2022 Jason Faultless <jason@altarstone.com> 10 * All rights reserved. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 16 * 1. Redistributions of source code must retain the above copyright notice, 17 * this list of conditions and the following disclaimer. 18 * 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 23 * 3. Neither the name of the copyright holder nor the names of its 24 * contributors may be used to endorse or promote products derived from 25 * this software without specific prior written permission. 26 * 27 * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 28 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 31 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 41 #ifndef TIN_H 42 # include "tin.h" 43 #endif /* !TIN_H */ 44 #ifndef TCURSES_H 45 # include "tcurses.h" 46 #endif /* !TCURSES_H */ 47 48 /* 49 * Local prototypes 50 */ 51 #ifdef USE_CURSES 52 static void do_scroll(int jump); 53 #endif /* USE_CURSES */ 54 55 56 /* 57 * Calculate the first and last objects that will appear on the current screen 58 * based on the current position and the max available 59 */ 60 void 61 set_first_screen_item( 62 void) 63 { 64 if (currmenu->max == 0) { 65 currmenu->first = 0; 66 currmenu->curr = -1; 67 return; 68 } 69 70 if (currmenu->curr >= currmenu->max) 71 currmenu->curr = currmenu->max - 1; 72 else if (currmenu->curr < -1) 73 currmenu->curr = -1; 74 75 if (currmenu->curr < currmenu->first || currmenu->curr > currmenu->first + NOTESLINES - 1) /* current selection is out of screen */ 76 currmenu->first = (currmenu->curr / NOTESLINES) * NOTESLINES; 77 } 78 79 80 void 81 move_up( 82 void) 83 { 84 if (!currmenu->max) 85 return; 86 87 if (currmenu->curr - 1 < currmenu->first && currmenu->curr != 0) { 88 currmenu->first--; 89 #ifdef USE_CURSES 90 do_scroll(-1); 91 currmenu->draw_item(currmenu->curr - 1); 92 #else 93 currmenu->redraw(); 94 #endif /* USE_CURSES */ 95 } 96 if (currmenu->curr == 0) { 97 currmenu->first = MAX(0, currmenu->max - NOTESLINES); 98 99 if (currmenu->max - 1 >= NOTESLINES) { 100 currmenu->curr = currmenu->max - 1; 101 currmenu->redraw(); 102 } else 103 move_to_item(currmenu->max - 1); 104 } else 105 move_to_item(currmenu->curr - 1); 106 } 107 108 109 void 110 move_down( 111 void) 112 { 113 if (!currmenu->max) 114 return; 115 116 if (currmenu->curr + 1 > currmenu->first + NOTESLINES - 1 && currmenu->curr + 1 < currmenu->max) { 117 currmenu->first++; 118 #ifdef USE_CURSES 119 do_scroll(1); 120 currmenu->draw_item(currmenu->curr + 1); 121 #else 122 currmenu->redraw(); 123 #endif /* USE_CURSES */ 124 } 125 move_to_item((currmenu->curr + 1 >= currmenu->max) ? 0 : (currmenu->curr + 1)); 126 } 127 128 129 void 130 page_up( 131 void) 132 { 133 int scroll_lines; 134 135 if (!currmenu->max) 136 return; 137 138 if (currmenu->curr == currmenu->first) { 139 scroll_lines = (tinrc.scroll_lines == -2) ? NOTESLINES / 2 : NOTESLINES; 140 if (currmenu->first == 0) { 141 /* wrap around */ 142 currmenu->first = MAX(0, currmenu->max - scroll_lines); 143 currmenu->curr = currmenu->max - 1; 144 } else { 145 currmenu->first = MAX(0, currmenu->first - scroll_lines); 146 currmenu->curr = currmenu->first; 147 } 148 currmenu->redraw(); 149 } else 150 move_to_item(currmenu->first); 151 } 152 153 154 void 155 page_down( 156 void) 157 { 158 int scroll_lines; 159 160 if (!currmenu->max) 161 return; 162 163 if (currmenu->curr == currmenu->max - 1) { 164 /* wrap around */ 165 currmenu->first = 0; 166 currmenu->curr = 0; 167 currmenu->redraw(); 168 } else { 169 scroll_lines = (tinrc.scroll_lines == -2) ? NOTESLINES / 2 : NOTESLINES; 170 if (currmenu->first + scroll_lines >= currmenu->max) 171 move_to_item(currmenu->max - 1); 172 else { 173 currmenu->first += scroll_lines; 174 currmenu->curr = currmenu->first; 175 currmenu->redraw(); 176 } 177 } 178 } 179 180 181 void 182 top_of_list( 183 void) 184 { 185 if (currmenu->max) 186 move_to_item(0); 187 } 188 189 190 void 191 end_of_list( 192 void) 193 { 194 if (currmenu->max) 195 move_to_item(currmenu->max - 1); 196 } 197 198 199 void 200 prompt_item_num( 201 int ch, 202 const char *prompt) 203 { 204 int num; 205 206 clear_message(); 207 208 if ((num = prompt_num(ch, prompt)) == -1) { 209 clear_message(); 210 return; 211 } 212 213 if (--num < 0) /* index from 0 (internal) vs. 1 (user) */ 214 num = 0; 215 216 if (num >= currmenu->max) 217 num = currmenu->max - 1; 218 219 move_to_item(num); 220 } 221 222 223 /* 224 * Move the on-screen pointer & internal pointer variable to a new position 225 */ 226 void 227 move_to_item( 228 int n) 229 { 230 if (currmenu->curr == n) 231 return; 232 233 HpGlitch(erase_arrow()); 234 erase_arrow(); 235 236 if ((currmenu->curr = n) < 0) 237 currmenu->curr = 0; 238 clear_message(); 239 240 if (n >= currmenu->first && n < currmenu->first + NOTESLINES) 241 currmenu->draw_arrow(); 242 else 243 currmenu->redraw(); 244 } 245 246 247 /* 248 * scroll the screen one line down 249 * the selected item is only moved if it is scrolled off the screen 250 */ 251 void 252 scroll_down( 253 void) 254 { 255 if (!currmenu->max || currmenu->first + NOTESLINES >= currmenu->max) 256 return; 257 258 currmenu->first++; 259 #ifdef USE_CURSES 260 do_scroll(1); 261 currmenu->draw_item(currmenu->first + NOTESLINES - 1); 262 stow_cursor(); 263 if (currmenu->curr < currmenu->first) 264 move_to_item(currmenu->curr + 1); 265 #else 266 if (currmenu->curr < currmenu->first) 267 currmenu->curr++; 268 currmenu->redraw(); 269 #endif /* USE_CURSES */ 270 } 271 272 273 /* 274 * scroll the screen one line up 275 * the selected item is only moved if it is scrolled off the screen 276 */ 277 void 278 scroll_up( 279 void) 280 { 281 if (!currmenu->max || currmenu->first == 0) 282 return; 283 284 currmenu->first--; 285 #ifdef USE_CURSES 286 do_scroll(-1); 287 currmenu->draw_item(currmenu->first); 288 stow_cursor(); 289 if (currmenu->curr >= currmenu->first + NOTESLINES) 290 move_to_item(currmenu->curr - 1); 291 #else 292 if (currmenu->curr >= currmenu->first + NOTESLINES) 293 currmenu->curr--; 294 currmenu->redraw(); 295 #endif /* USE_CURSES */ 296 } 297 298 299 #ifdef USE_CURSES 300 /* TODO: merge with options_menu.c:do_scroll() and move to tcurses.c */ 301 /* scroll the screen 'jump' lines down or up (if 'jump' < 0) */ 302 static void 303 do_scroll( 304 int jump) 305 { 306 scrollok(stdscr, TRUE); 307 MoveCursor(INDEX_TOP, 0); 308 SetScrollRegion(INDEX_TOP, INDEX_TOP + NOTESLINES - 1); 309 ScrollScreen(jump); 310 SetScrollRegion(0, LINES - 1); 311 scrollok(stdscr, FALSE); 312 } 313 #endif /* USE_CURSES */ 314 315 316 /* 317 * Handle mouse clicks. We simply map the event to a return 318 * keymap code that will drop through to call the correct function 319 */ 320 t_function 321 global_mouse_action( 322 t_function (*left_action) (void), 323 t_function (*right_action) (void)) 324 { 325 int INDEX_BOTTOM = INDEX_TOP + NOTESLINES; 326 327 switch (xmouse) { 328 case MOUSE_BUTTON_1: 329 case MOUSE_BUTTON_3: 330 if (xrow < INDEX_TOP || xrow >= INDEX_BOTTOM) 331 return GLOBAL_PAGE_DOWN; 332 333 erase_arrow(); 334 currmenu->curr = MIN(xrow - INDEX_TOP + currmenu->first, currmenu->max - INDEX_TOP + 1); 335 currmenu->draw_arrow(); 336 337 if (xmouse == MOUSE_BUTTON_1) 338 return right_action(); 339 break; 340 341 case MOUSE_BUTTON_2: 342 if (xrow < INDEX_TOP || xrow >= INDEX_BOTTOM) 343 return GLOBAL_PAGE_UP; 344 345 return left_action(); 346 347 default: 348 break; 349 } 350 return NOT_ASSIGNED; 351 } 352 353 354 t_function 355 handle_keypad( 356 t_function (*left_action) (void), 357 t_function (*right_action) (void), 358 t_function (*mouse_action) ( 359 t_function (*left_action) (void), 360 t_function (*right_action) (void)), 361 const struct keylist keys) 362 { 363 #if defined(MULTIBYTE_ABLE) && !defined(NO_LOCALE) 364 wint_t ch = ReadWch(); 365 #else 366 int ch = ReadCh(); 367 #endif /* MULTIBYTE_ABLE && !NO_LOCALE */ 368 t_function func = NOT_ASSIGNED; 369 370 switch (ch) { 371 case ESC: /* common arrow keys */ 372 #ifdef HAVE_KEY_PREFIX 373 case KEY_PREFIX: 374 #endif /* HAVE_KEY_PREFIX */ 375 switch (get_arrow_key((int) ch)) { 376 case KEYMAP_UP: 377 func = GLOBAL_LINE_UP; 378 break; 379 380 case KEYMAP_DOWN: 381 func = GLOBAL_LINE_DOWN; 382 break; 383 384 case KEYMAP_LEFT: 385 func = left_action(); 386 break; 387 388 case KEYMAP_RIGHT: 389 func = right_action(); 390 break; 391 392 case KEYMAP_PAGE_UP: 393 func = GLOBAL_PAGE_UP; 394 break; 395 396 case KEYMAP_PAGE_DOWN: 397 func = GLOBAL_PAGE_DOWN; 398 break; 399 400 case KEYMAP_HOME: 401 func = GLOBAL_FIRST_PAGE; 402 break; 403 404 case KEYMAP_END: 405 func = GLOBAL_LAST_PAGE; 406 break; 407 408 case KEYMAP_MOUSE: 409 if (mouse_action) 410 func = mouse_action(left_action, right_action); 411 break; 412 413 default: 414 break; 415 } 416 break; 417 418 default: 419 func = key_to_func((wchar_t) ch, keys); 420 break; 421 } 422 return func; 423 } 424 425 426 /* 427 * bug/gripe/comment mailed to author 428 */ 429 void 430 bug_report( 431 void) 432 { 433 mail_bug_report(); 434 ClearScreen(); 435 currmenu->redraw(); 436 }