src/list_window.c

   1 /* ncmpc (Ncurses MPD Client)
   2  * (c) 2004-2009 The Music Player Daemon Project
   3  * Project homepage: http://musicpd.org
   4
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "list_window.h"
  21 #include "config.h"
  22 #include "options.h"
  23 #include "charset.h"
  24 #include "match.h"
  25 #include "command.h"
  26 #include "colors.h"
  27 #include "paint.h"
  28 #include "screen_message.h"
  29 #include "i18n.h"
  30
  31 #include <assert.h>
  32 #include <stdlib.h>
  33 #include <unistd.h>
  34 #include <string.h>
  35
  36 extern void screen_bell(void);
  37
  38 struct list_window *
  39 list_window_init(WINDOW *w, unsigned width, unsigned height)
  40 {
  41         struct list_window *lw;
  42
  43         lw = g_malloc0(sizeof(*lw));
  44         lw->w = w;
  45         lw->cols = width;
  46         lw->rows = height;
  47         lw->range_selection = false;
  48         return lw;
  49 }
  50
  51 void
  52 list_window_free(struct list_window *lw)
  53 {
  54         assert(lw != NULL);
  55
  56         g_free(lw);
  57 }
  58
  59 void
  60 list_window_reset(struct list_window *lw)
  61 {
  62         lw->selected = 0;
  63         lw->range_selection = false;
  64         lw->range_base = 0;
  65         lw->start = 0;
  66 }
  67
  68 static unsigned
  69 list_window_validate_index(const struct list_window *lw, unsigned i)
  70 {
  71         if (lw->length == 0)
  72                 return 0;
  73         else if (i >= lw->length)
  74                 return lw->length - 1;
  75         else
  76                 return i;
  77 }
  78
  79 static void
  80 list_window_check_selected(struct list_window *lw)
  81 {
  82         lw->selected = list_window_validate_index(lw, lw->selected);
  83
  84         if(lw->range_selection)
  85                 lw->range_base =
  86                         list_window_validate_index(lw, lw->range_base);
  87 }
  88
  89 /**
  90  * Scroll after the cursor was moved, the list was changed or the
  91  * window was resized.
  92  */
  93 static void
  94 list_window_check_origin(struct list_window *lw)
  95 {
  96         int start = lw->start;
  97
  98         if ((unsigned) options.scroll_offset * 2 >= lw->rows)
  99                 // Center if the offset is more than half the screen
 100                 start = lw->selected - lw->rows / 2;
 101         else {
 102                 if (lw->selected < lw->start + options.scroll_offset)
 103                         start = lw->selected - options.scroll_offset;
 104
 105                 if (lw->selected >= lw->start + lw->rows - options.scroll_offset)
 106                         start = lw->selected - lw->rows + 1 + options.scroll_offset;
 107         }
 108
 109         if (start + lw->rows > lw->length)
 110                 start = lw->length - lw->rows;
 111
 112         if (start < 0 || lw->length == 0)
 113                 start = 0;
 114
 115         lw->start = start;
 116 }
 117
 118 void
 119 list_window_resize(struct list_window *lw, unsigned width, unsigned height)
 120 {
 121         lw->cols = width;
 122         lw->rows = height;
 123
 124         list_window_check_origin(lw);
 125 }
 126
 127 void
 128 list_window_set_length(struct list_window *lw, unsigned length)
 129 {
 130         lw->length = length;
 131
 132         list_window_check_selected(lw);
 133         list_window_check_origin(lw);
 134 }
 135
 136 void
 137 list_window_center(struct list_window *lw, unsigned n)
 138 {
 139         if (n > lw->rows / 2)
 140                 lw->start = n - lw->rows / 2;
 141         else
 142                 lw->start = 0;
 143
 144         if (lw->start + lw->rows > lw->length) {
 145                 if (lw->rows < lw->length)
 146                         lw->start = lw->length - lw->rows;
 147                 else
 148                         lw->start = 0;
 149         }
 150 }
 151
 152 void
 153 list_window_set_cursor(struct list_window *lw, unsigned i)
 154 {
 155         lw->range_selection = false;
 156         lw->selected = i;
 157
 158         list_window_check_selected(lw);
 159         list_window_check_origin(lw);
 160 }
 161
 162 void
 163 list_window_move_cursor(struct list_window *lw, unsigned n)
 164 {
 165         lw->selected = n;
 166
 167         list_window_check_selected(lw);
 168         list_window_check_origin(lw);
 169 }
 170
 171 void
 172 list_window_fetch_cursor(struct list_window *lw)
 173 {
 174         if (lw->start > 0 &&
 175             lw->selected < lw->start + options.scroll_offset)
 176                 list_window_move_cursor(lw, lw->start + options.scroll_offset);
 177         else if (lw->start + lw->rows < lw->length &&
 178                  lw->selected > lw->start + lw->rows - 1 - options.scroll_offset)
 179                 list_window_move_cursor(lw, lw->start + lw->rows - 1 - options.scroll_offset);
 180 }
 181
 182 void
 183 list_window_get_range(const struct list_window *lw,
 184                       struct list_window_range *range)
 185 {
 186         if (lw->length == 0) {
 187                 /* empty list - no selection */
 188                 range->start = 0;
 189                 range->end = 0;
 190         } else if (lw->range_selection) {
 191                 /* a range selection */
 192                 if (lw->range_base < lw->selected) {
 193                         range->start = lw->range_base;
 194                         range->end = lw->selected + 1;
 195                 } else {
 196                         range->start = lw->selected;
 197                         range->end = lw->range_base + 1;
 198                 }
 199         } else {
 200                 /* no range, just the cursor */
 201                 range->start = lw->selected;
 202                 range->end = lw->selected + 1;
 203         }
 204 }
 205
 206 static void
 207 list_window_next(struct list_window *lw)
 208 {
 209         if (lw->selected + 1 < lw->length)
 210                 list_window_move_cursor(lw, lw->selected + 1);
 211         else if (options.list_wrap)
 212                 list_window_move_cursor(lw, 0);
 213 }
 214
 215 static void
 216 list_window_previous(struct list_window *lw)
 217 {
 218         if (lw->selected > 0)
 219                 list_window_move_cursor(lw, lw->selected - 1);
 220         else if (options.list_wrap)
 221                 list_window_move_cursor(lw, lw->length - 1);
 222 }
 223
 224 static void
 225 list_window_top(struct list_window *lw)
 226 {
 227         if (lw->start == 0)
 228                 list_window_move_cursor(lw, lw->start);
 229         else
 230                 if ((unsigned) options.scroll_offset * 2 >= lw->rows)
 231                         list_window_move_cursor(lw, lw->start + lw->rows / 2);
 232                 else
 233                         list_window_move_cursor(lw, lw->start + options.scroll_offset);
 234 }
 235
 236 static void
 237 list_window_middle(struct list_window *lw)
 238 {
 239         if (lw->length >= lw->rows)
 240                 list_window_move_cursor(lw, lw->start + lw->rows / 2);
 241         else
 242                 list_window_move_cursor(lw, lw->length / 2);
 243 }
 244
 245 static void
 246 list_window_bottom(struct list_window *lw)
 247 {
 248         if (lw->length >= lw->rows)
 249                 if ((unsigned) options.scroll_offset * 2 >= lw->rows)
 250                         list_window_move_cursor(lw, lw->start + lw->rows / 2);
 251                 else
 252                         if (lw->start + lw->rows == lw->length)
 253                                 list_window_move_cursor(lw, lw->length - 1);
 254                         else
 255                                 list_window_move_cursor(lw, lw->start + lw->rows - 1 - options.scroll_offset);
 256         else
 257                 list_window_move_cursor(lw, lw->length - 1);
 258 }
 259
 260 static void
 261 list_window_first(struct list_window *lw)
 262 {
 263         list_window_move_cursor(lw, 0);
 264 }
 265
 266 static void
 267 list_window_last(struct list_window *lw)
 268 {
 269         if (lw->length > 0)
 270                 list_window_move_cursor(lw, lw->length - 1);
 271         else
 272                 list_window_move_cursor(lw, 0);
 273 }
 274
 275 static void
 276 list_window_next_page(struct list_window *lw)
 277 {
 278         if (lw->rows < 2)
 279                 return;
 280         if (lw->selected + lw->rows < lw->length)
 281                 list_window_move_cursor(lw, lw->selected + lw->rows - 1);
 282         else
 283                 list_window_last(lw);
 284 }
 285
 286 static void
 287 list_window_previous_page(struct list_window *lw)
 288 {
 289         if (lw->rows < 2)
 290                 return;
 291         if (lw->selected > lw->rows - 1)
 292                 list_window_move_cursor(lw, lw->selected - lw->rows + 1);
 293         else
 294                 list_window_first(lw);
 295 }
 296
 297 static void
 298 list_window_scroll_up(struct list_window *lw, unsigned n)
 299 {
 300         if (lw->start > 0) {
 301                 if (n > lw->start)
 302                         lw->start = 0;
 303                 else
 304                         lw->start -= n;
 305
 306                 list_window_fetch_cursor(lw);
 307         }
 308 }
 309
 310 static void
 311 list_window_scroll_down(struct list_window *lw, unsigned n)
 312 {
 313         if (lw->start + lw->rows < lw->length)
 314         {
 315                 if ( lw->start + lw->rows + n > lw->length - 1)
 316                         lw->start = lw->length - lw->rows;
 317                 else
 318                         lw->start += n;
 319
 320                 list_window_fetch_cursor(lw);
 321         }
 322 }
 323
 324 static void
 325 list_window_paint_row(WINDOW *w, unsigned y, unsigned width,
 326                       bool selected, bool highlight,
 327                       const char *text, const char *second_column)
 328 {
 329         unsigned second_column_width;
 330
 331 #ifdef NCMPC_MINI
 332         second_column = NULL;
 333         highlight = false;
 334 #endif /* NCMPC_MINI */
 335
 336         if (second_column != NULL) {
 337                 second_column_width = utf8_width(second_column) + 1;
 338                 if (second_column_width < width)
 339                         width -= second_column_width;
 340                 else
 341                         second_column_width = 0;
 342         } else
 343                 second_column_width = 0;
 344
 345         row_color(w, highlight ? COLOR_LIST_BOLD : COLOR_LIST, selected);
 346
 347         waddstr(w, text);
 348
 349         /* erase the unused space after the text */
 350         row_clear_to_eol(w, width, selected);
 351
 352         if (second_column_width > 0) {
 353                 wmove(w, y, width);
 354                 waddch(w, ' ');
 355                 waddstr(w, second_column);
 356         }
 357 }
 358
 359 void
 360 list_window_paint(const struct list_window *lw,
 361                   list_window_callback_fn_t callback,
 362                   void *callback_data)
 363 {
 364         bool show_cursor = !lw->hide_cursor &&
 365                 (!options.hardware_cursor || lw->range_selection);
 366         struct list_window_range range;
 367
 368         if (show_cursor)
 369                 list_window_get_range(lw, &range);
 370
 371         for (unsigned i = 0; i < lw->rows; i++) {
 372                 const char *label;
 373                 bool highlight = false;
 374                 char *second_column = NULL;
 375
 376                 wmove(lw->w, i, 0);
 377
 378                 if (lw->start + i >= lw->length) {
 379                         wclrtobot(lw->w);
 380                         break;
 381                 }
 382
 383                 label = callback(lw->start + i, &highlight, &second_column, callback_data);
 384                 assert(label != NULL);
 385
 386 #ifdef NCMPC_MINI
 387                 highlight = false;
 388                 second_column = NULL;
 389 #endif /* NCMPC_MINI */
 390
 391                 list_window_paint_row(lw->w, i, lw->cols,
 392                                       show_cursor &&
 393                                       lw->start + i >= range.start &&
 394                                       lw->start + i < range.end,
 395                                       highlight,
 396                                       label, second_column);
 397
 398                 if (second_column != NULL)
 399                         g_free(second_column);
 400         }
 401
 402         row_color_end(lw->w);
 403
 404         if (options.hardware_cursor && lw->selected >= lw->start &&
 405             lw->selected < lw->start + lw->rows) {
 406                 curs_set(1);
 407                 wmove(lw->w, lw->selected - lw->start, 0);
 408         }
 409 }
 410
 411 bool
 412 list_window_find(struct list_window *lw,
 413                  list_window_callback_fn_t callback,
 414                  void *callback_data,
 415                  const char *str,
 416                  bool wrap,
 417                  bool bell_on_wrap)
 418 {
 419         bool h;
 420         unsigned i = lw->selected + 1;
 421         const char *label;
 422
 423         assert(str != NULL);
 424
 425         do {
 426                 while (i < lw->length) {
 427                         label = callback(i, &h, NULL, callback_data);
 428                         assert(label != NULL);
 429
 430                         if (match_line(label, str)) {
 431                                 list_window_move_cursor(lw, i);
 432                                 return true;
 433                         }
 434                         if (wrap && i == lw->selected)
 435                                 return false;
 436                         i++;
 437                 }
 438                 if (wrap) {
 439                         if (i == 0) /* empty list */
 440                                 return 1;
 441                         i=0; /* first item */
 442                         if (bell_on_wrap) {
 443                                 screen_bell();
 444                         }
 445                 }
 446         } while (wrap);
 447
 448         return false;
 449 }
 450
 451 bool
 452 list_window_rfind(struct list_window *lw,
 453                   list_window_callback_fn_t callback,
 454                   void *callback_data,
 455                   const char *str,
 456                   bool wrap,
 457                   bool bell_on_wrap)
 458 {
 459         bool h;
 460         int i = lw->selected - 1;
 461         const char *label;
 462
 463         assert(str != NULL);
 464
 465         if (lw->length == 0)
 466                 return false;
 467
 468         do {
 469                 while (i >= 0) {
 470                         label = callback(i, &h, NULL, callback_data);
 471                         assert(label != NULL);
 472
 473                         if (match_line(label, str)) {
 474                                 list_window_move_cursor(lw, i);
 475                                 return true;
 476                         }
 477                         if (wrap && i == (int)lw->selected)
 478                                 return false;
 479                         i--;
 480                 }
 481                 if (wrap) {
 482                         i = lw->length - 1; /* last item */
 483                         if (bell_on_wrap) {
 484                                 screen_bell();
 485                         }
 486                 }
 487         } while (wrap);
 488
 489         return false;
 490 }
 491
 492 static bool
 493 jump_match(const char *haystack, const char *needle)
 494 {
 495 #ifdef NCMPC_MINI
 496         bool jump_prefix_only = true;
 497 #else
 498         bool jump_prefix_only = options.jump_prefix_only;
 499 #endif
 500
 501         assert(haystack != NULL);
 502         assert(needle != NULL);
 503
 504         return jump_prefix_only
 505                 ? g_ascii_strncasecmp(haystack, needle, strlen(needle)) == 0
 506                 : match_line(haystack, needle);
 507 }
 508
 509 bool
 510 list_window_jump(struct list_window *lw,
 511                  list_window_callback_fn_t callback,
 512                  void *callback_data,
 513                  const char *str)
 514 {
 515         bool h;
 516         const char *label;
 517
 518         assert(str != NULL);
 519
 520         for (unsigned i = 0; i < lw->length; ++i) {
 521                 label = callback(i, &h, NULL, callback_data);
 522                 assert(label != NULL);
 523
 524                 if (label[0] == '[')
 525                         label++;
 526
 527                 if (jump_match(label, str)) {
 528                         list_window_move_cursor(lw, i);
 529                         return true;
 530                 }
 531         }
 532         return false;
 533 }
 534
 535 /* perform basic list window commands (movement) */
 536 bool
 537 list_window_cmd(struct list_window *lw, command_t cmd)
 538 {
 539         switch (cmd) {
 540         case CMD_LIST_PREVIOUS:
 541                 list_window_previous(lw);
 542                 break;
 543         case CMD_LIST_NEXT:
 544                 list_window_next(lw);
 545                 break;
 546         case CMD_LIST_TOP:
 547                 list_window_top(lw);
 548                 break;
 549         case CMD_LIST_MIDDLE:
 550                 list_window_middle(lw);
 551                 break;
 552         case CMD_LIST_BOTTOM:
 553                 list_window_bottom(lw);
 554                 break;
 555         case CMD_LIST_FIRST:
 556                 list_window_first(lw);
 557                 break;
 558         case CMD_LIST_LAST:
 559                 list_window_last(lw);
 560                 break;
 561         case CMD_LIST_NEXT_PAGE:
 562                 list_window_next_page(lw);
 563                 break;
 564         case CMD_LIST_PREVIOUS_PAGE:
 565                 list_window_previous_page(lw);
 566                 break;
 567         case CMD_LIST_RANGE_SELECT:
 568                 if(lw->range_selection)
 569                 {
 570                         screen_status_printf(_("Range selection disabled"));
 571                         list_window_set_cursor(lw, lw->selected);
 572                 }
 573                 else
 574                 {
 575                         screen_status_printf(_("Range selection enabled"));
 576                         lw->range_base = lw->selected;
 577                         lw->range_selection = true;
 578                 }
 579                 break;
 580         case CMD_LIST_SCROLL_UP_LINE:
 581                 list_window_scroll_up(lw, 1);
 582                 break;
 583         case CMD_LIST_SCROLL_DOWN_LINE:
 584                 list_window_scroll_down(lw, 1);
 585                 break;
 586         case CMD_LIST_SCROLL_UP_HALF:
 587                 list_window_scroll_up(lw, (lw->rows - 1) / 2);
 588                 break;
 589         case CMD_LIST_SCROLL_DOWN_HALF:
 590                 list_window_scroll_down(lw, (lw->rows - 1) / 2);
 591                 break;
 592         default:
 593                 return false;
 594         }
 595
 596         return true;
 597 }
 598
 599 bool
 600 list_window_scroll_cmd(struct list_window *lw, command_t cmd)
 601 {
 602         switch (cmd) {
 603         case CMD_LIST_SCROLL_UP_LINE:
 604         case CMD_LIST_PREVIOUS:
 605                 if (lw->start > 0)
 606                         lw->start--;
 607                 break;
 608
 609         case CMD_LIST_SCROLL_DOWN_LINE:
 610         case CMD_LIST_NEXT:
 611                 if (lw->start + lw->rows < lw->length)
 612                         lw->start++;
 613                 break;
 614
 615         case CMD_LIST_FIRST:
 616                 lw->start = 0;
 617                 break;
 618
 619         case CMD_LIST_LAST:
 620                 if (lw->length > lw->rows)
 621                         lw->start = lw->length - lw->rows;
 622                 else
 623                         lw->start = 0;
 624                 break;
 625
 626         case CMD_LIST_NEXT_PAGE:
 627                 lw->start += lw->rows - 1;
 628                 if (lw->start + lw->rows > lw->length) {
 629                         if (lw->length > lw->rows)
 630                                 lw->start = lw->length - lw->rows;
 631                         else
 632                                 lw->start = 0;
 633                 }
 634                 break;
 635
 636         case CMD_LIST_PREVIOUS_PAGE:
 637                 if (lw->start > lw->rows)
 638                         lw->start -= lw->rows;
 639                 else
 640                         lw->start = 0;
 641                 break;
 642
 643         case CMD_LIST_SCROLL_UP_HALF:
 644                 if (lw->start > (lw->rows - 1) / 2)
 645                         lw->start -= (lw->rows - 1) / 2;
 646                 else
 647                         lw->start = 0;
 648                 break;
 649
 650         case CMD_LIST_SCROLL_DOWN_HALF:
 651                 lw->start += (lw->rows - 1) / 2;
 652                 if (lw->start + lw->rows > lw->length) {
 653                         if (lw->length > lw->rows)
 654                                 lw->start = lw->length - lw->rows;
 655                         else
 656                                 lw->start = 0;
 657                 }
 658                 break;
 659
 660         default:
 661                 return false;
 662         }
 663
 664         return true;
 665 }
 666
 667 #ifdef HAVE_GETMOUSE
 668 bool
 669 list_window_mouse(struct list_window *lw, unsigned long bstate, int y)
 670 {
 671         assert(lw != NULL);
 672
 673         /* if the even occurred above the list window move up */
 674         if (y < 0) {
 675                 if (bstate & BUTTON3_CLICKED)
 676                         list_window_first(lw);
 677                 else
 678                         list_window_previous_page(lw);
 679                 return true;
 680         }
 681
 682         /* if the even occurred below the list window move down */
 683         if ((unsigned)y >= lw->length) {
 684                 if (bstate & BUTTON3_CLICKED)
 685                         list_window_last(lw);
 686                 else
 687                         list_window_next_page(lw);
 688                 return true;
 689         }
 690
 691         return false;
 692 }
 693 #endif