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 "screen_message.h"
  28 #include "i18n.h"
  29
  30 #include <assert.h>
  31 #include <stdlib.h>
  32 #include <unistd.h>
  33 #include <string.h>
  34
  35 extern void screen_bell(void);
  36
  37 struct list_window *
  38 list_window_init(WINDOW *w, unsigned width, unsigned height)
  39 {
  40         struct list_window *lw;
  41
  42         lw = g_malloc0(sizeof(*lw));
  43         lw->w = w;
  44         lw->cols = width;
  45         lw->rows = height;
  46         lw->range_selection = false;
  47         return lw;
  48 }
  49
  50 void
  51 list_window_free(struct list_window *lw)
  52 {
  53         assert(lw != NULL);
  54
  55         g_free(lw);
  56 }
  57
  58 void
  59 list_window_reset(struct list_window *lw)
  60 {
  61         lw->selected = 0;
  62         lw->selected_start = 0;
  63         lw->selected_end = 0;
  64         lw->range_selection = false;
  65         lw->range_base = 0;
  66         lw->start = 0;
  67 }
  68
  69 static void
  70 list_window_check_selected(struct list_window *lw)
  71 {
  72         if (lw->start + lw->rows > lw->length) {
  73                 if (lw->length > lw->rows)
  74                         lw->start = lw->length - lw->rows;
  75                 else
  76                         lw->start = 0;
  77         }
  78
  79         if (lw->selected < lw->start)
  80                 lw->selected = lw->start;
  81
  82         if (lw->length == 0)
  83                 lw->selected = 0;
  84         else if (lw->selected >= lw->length)
  85                 lw->selected = lw->length - 1;
  86
  87         if(lw->range_selection)
  88         {
  89                 if (lw->length == 0) {
  90                         lw->selected_start = 0;
  91                         lw->selected_end = 0;
  92                         lw->range_base = 0;
  93                 } else {
  94                         if (lw->selected_start >= lw->length)
  95                                 lw->selected_start = lw->length - 1;
  96                         if (lw->selected_end >= lw->length)
  97                                 lw->selected_end = lw->length - 1;
  98                         if (lw->range_base >= lw->length)
  99                                 lw->range_base = lw->length - 1;
 100                 }
 101
 102                 if(lw->range_base > lw->selected_end)
 103                           lw->selected_end = lw->selected;
 104                 if(lw->range_base < lw->selected_start)
 105                           lw->selected_start = lw->selected;
 106         }
 107         else
 108         {
 109                 lw->selected_start = lw->selected;
 110                 lw->selected_end = lw->selected;
 111         }
 112 }
 113
 114 /**
 115  * Scroll after the cursor was moved, the list was changed or the
 116  * window was resized.
 117  */
 118 static void
 119 list_window_check_origin(struct list_window *lw)
 120 {
 121         int start = lw->start;
 122
 123         if ((unsigned) options.scroll_offset * 2 >= lw->rows)
 124                 // Center if the offset is more than half the screen
 125                 start = lw->selected - lw->rows / 2;
 126         else
 127                 {
 128                         if (lw->selected < lw->start + options.scroll_offset)
 129                                 start = lw->selected - options.scroll_offset;
 130
 131                         if (lw->selected >= lw->start + lw->rows - options.scroll_offset)
 132                                 {
 133                                         start = lw->selected - lw->rows + 1 + options.scroll_offset;
 134                                 }
 135                 }
 136
 137         if (start + lw->rows > lw->length)
 138                 start = lw->length - lw->rows;
 139
 140         if (start < 0 || lw->length == 0)
 141                 start = 0;
 142
 143         lw->start = start;
 144 }
 145
 146 void
 147 list_window_resize(struct list_window *lw, unsigned width, unsigned height)
 148 {
 149         lw->cols = width;
 150         lw->rows = height;
 151
 152         list_window_check_origin(lw);
 153 }
 154
 155 void
 156 list_window_set_length(struct list_window *lw, unsigned length)
 157 {
 158         lw->length = length;
 159
 160         list_window_check_selected(lw);
 161         list_window_check_origin(lw);
 162 }
 163
 164 void
 165 list_window_center(struct list_window *lw, unsigned n)
 166 {
 167         if (n > lw->rows / 2)
 168                 lw->start = n - lw->rows / 2;
 169         else
 170                 lw->start = 0;
 171
 172         if (lw->start + lw->rows > lw->length) {
 173                 if (lw->rows < lw->length)
 174                         lw->start = lw->length - lw->rows;
 175                 else
 176                         lw->start = 0;
 177         }
 178 }
 179
 180 void
 181 list_window_set_cursor(struct list_window *lw, unsigned i)
 182 {
 183         lw->range_selection = false;
 184         lw->selected = i;
 185         lw->selected_start = i;
 186         lw->selected_end = i;
 187
 188         list_window_check_selected(lw);
 189         list_window_check_origin(lw);
 190 }
 191
 192 void
 193 list_window_move_cursor(struct list_window *lw, unsigned n)
 194 {
 195         lw->selected = n;
 196         if(lw->range_selection)
 197         {
 198                 if(n >= lw->range_base)
 199                 {
 200                         lw->selected_end = n;
 201                         lw->selected_start = lw->range_base;
 202                 }
 203                 if(n <= lw->range_base)
 204                 {
 205                         lw->selected_start = n;
 206                         lw->selected_end = lw->range_base;
 207                 }
 208         }
 209         else
 210         {
 211                 lw->selected_start = n;
 212                 lw->selected_end = n;
 213         }
 214
 215         list_window_check_selected(lw);
 216         list_window_check_origin(lw);
 217 }
 218
 219 void
 220 list_window_fetch_cursor(struct list_window *lw)
 221 {
 222         if (lw->selected < lw->start + options.scroll_offset) {
 223                 if (lw->start > 0)
 224                         lw->selected = lw->start + options.scroll_offset;
 225                 if (lw->range_selection) {
 226                         if (lw->selected > lw->range_base) {
 227                                 lw->selected_end = lw->selected;
 228                                 lw->selected_start = lw->range_base;
 229                         } else {
 230                                 lw->selected_start = lw->selected;
 231                         }
 232                 } else {
 233                         lw->selected_start = lw->selected;
 234                         lw->selected_end = lw->selected;
 235                 }
 236         } else if (lw->selected > lw->start + lw->rows - 1 - options.scroll_offset) {
 237                 if (lw->start + lw->rows < lw->length)
 238                         lw->selected = lw->start + lw->rows - 1 - options.scroll_offset;
 239                 if (lw->range_selection) {
 240                         if (lw->selected < lw->range_base) {
 241                                 lw->selected_start = lw->selected;
 242                                 lw->selected_end = lw->range_base;
 243                         } else {
 244                                 lw->selected_end = lw->selected;
 245                         }
 246                 } else {
 247                         lw->selected_start = lw->selected;
 248                         lw->selected_end = lw->selected;
 249                 }
 250         }
 251 }
 252
 253 static void
 254 list_window_next(struct list_window *lw)
 255 {
 256         if (lw->selected + 1 < lw->length)
 257                 list_window_move_cursor(lw, lw->selected + 1);
 258         else if (options.list_wrap)
 259                 list_window_move_cursor(lw, 0);
 260 }
 261
 262 static void
 263 list_window_previous(struct list_window *lw)
 264 {
 265         if (lw->selected > 0)
 266                 list_window_move_cursor(lw, lw->selected - 1);
 267         else if (options.list_wrap)
 268                 list_window_move_cursor(lw, lw->length - 1);
 269 }
 270
 271 static void
 272 list_window_top(struct list_window *lw)
 273 {
 274         if (lw->start == 0)
 275                 list_window_move_cursor(lw, lw->start);
 276         else
 277                 if ((unsigned) options.scroll_offset * 2 >= lw->rows)
 278                         list_window_move_cursor(lw, lw->start + lw->rows / 2);
 279                 else
 280                         list_window_move_cursor(lw, lw->start + options.scroll_offset);
 281 }
 282
 283 static void
 284 list_window_middle(struct list_window *lw)
 285 {
 286         if (lw->length >= lw->rows)
 287                 list_window_move_cursor(lw, lw->start + lw->rows / 2);
 288         else
 289                 list_window_move_cursor(lw, lw->length / 2);
 290 }
 291
 292 static void
 293 list_window_bottom(struct list_window *lw)
 294 {
 295         if (lw->length >= lw->rows)
 296                 if ((unsigned) options.scroll_offset * 2 >= lw->rows)
 297                         list_window_move_cursor(lw, lw->start + lw->rows / 2);
 298                 else
 299                         if (lw->start + lw->rows == lw->length)
 300                                 list_window_move_cursor(lw, lw->length - 1);
 301                         else
 302                                 list_window_move_cursor(lw, lw->start + lw->rows - 1 - options.scroll_offset);
 303         else
 304                 list_window_move_cursor(lw, lw->length - 1);
 305 }
 306
 307 static void
 308 list_window_first(struct list_window *lw)
 309 {
 310         list_window_move_cursor(lw, 0);
 311 }
 312
 313 static void
 314 list_window_last(struct list_window *lw)
 315 {
 316         if (lw->length > 0)
 317                 list_window_move_cursor(lw, lw->length - 1);
 318         else
 319                 list_window_move_cursor(lw, 0);
 320 }
 321
 322 static void
 323 list_window_next_page(struct list_window *lw)
 324 {
 325         if (lw->rows < 2)
 326                 return;
 327         if (lw->selected + lw->rows < lw->length)
 328                 list_window_move_cursor(lw, lw->selected + lw->rows - 1);
 329         else
 330                 list_window_last(lw);
 331 }
 332
 333 static void
 334 list_window_previous_page(struct list_window *lw)
 335 {
 336         if (lw->rows < 2)
 337                 return;
 338         if (lw->selected > lw->rows - 1)
 339                 list_window_move_cursor(lw, lw->selected - lw->rows + 1);
 340         else
 341                 list_window_first(lw);
 342 }
 343
 344 static void
 345 list_window_scroll_up(struct list_window *lw, unsigned n)
 346 {
 347         if (lw->start > 0) {
 348                 if (n > lw->start)
 349                         lw->start = 0;
 350                 else
 351                         lw->start -= n;
 352
 353                 list_window_fetch_cursor(lw);
 354         }
 355 }
 356
 357 static void
 358 list_window_scroll_down(struct list_window *lw, unsigned n)
 359 {
 360         if (lw->start + lw->rows < lw->length)
 361         {
 362                 if ( lw->start + lw->rows + n > lw->length - 1)
 363                         lw->start = lw->length - lw->rows;
 364                 else
 365                         lw->start += n;
 366
 367                 list_window_fetch_cursor(lw);
 368         }
 369 }
 370
 371 static void
 372 list_window_paint_row(WINDOW *w, unsigned y, unsigned width,
 373                       bool selected, bool highlight,
 374                       const char *text, const char *second_column)
 375 {
 376         unsigned text_width = utf8_width(text);
 377         unsigned second_column_width;
 378
 379 #ifdef NCMPC_MINI
 380         second_column = NULL;
 381 #endif /* NCMPC_MINI */
 382
 383         if (second_column != NULL) {
 384                 second_column_width = utf8_width(second_column) + 1;
 385                 if (second_column_width < width)
 386                         width -= second_column_width;
 387                 else
 388                         second_column_width = 0;
 389         } else
 390                 second_column_width = 0;
 391
 392         if (highlight)
 393                 colors_use(w, COLOR_LIST_BOLD);
 394         else
 395                 colors_use(w, COLOR_LIST);
 396
 397         if (selected)
 398                 wattron(w, A_REVERSE);
 399
 400         waddstr(w, text);
 401         if (options.wide_cursor && text_width < width)
 402                 whline(w, ' ', width - text_width);
 403
 404         if (second_column_width > 0) {
 405                 wmove(w, y, width);
 406                 waddch(w, ' ');
 407                 waddstr(w, second_column);
 408         }
 409
 410         if (selected)
 411                 wattroff(w, A_REVERSE);
 412
 413         if (!options.wide_cursor && text_width < width) {
 414                 if (second_column_width == 0)
 415                         /* the cursor is at the end of the text; clear
 416                            the rest of this row */
 417                         wclrtoeol(w);
 418                 else
 419                         /* there's a second column: clear the space
 420                            between the first and the second column */
 421                         mvwhline(w, y, text_width, ' ', width - text_width);
 422         }
 423 }
 424
 425 void
 426 list_window_paint(const struct list_window *lw,
 427                   list_window_callback_fn_t callback,
 428                   void *callback_data)
 429 {
 430         unsigned i;
 431         bool show_cursor = !lw->hide_cursor;
 432         bool highlight = false;
 433
 434         show_cursor = show_cursor &&
 435                 (!options.hardware_cursor || lw->range_selection);
 436
 437         for (i = 0; i < lw->rows; i++) {
 438                 const char *label;
 439                 char *second_column = NULL;
 440                 highlight = false;
 441
 442                 wmove(lw->w, i, 0);
 443
 444                 if (lw->start + i >= lw->length) {
 445                         wclrtobot(lw->w);
 446                         break;
 447                 }
 448
 449                 label = callback(lw->start + i, &highlight, &second_column, callback_data);
 450                 assert(label != NULL);
 451
 452                 list_window_paint_row(lw->w, i, lw->cols,
 453                                       show_cursor &&
 454                                       lw->start + i >= lw->selected_start &&
 455                                       lw->start + i <= lw->selected_end,
 456                                       highlight,
 457                                       label, second_column);
 458
 459                 if (second_column != NULL)
 460                         g_free(second_column);
 461         }
 462
 463         if (options.hardware_cursor && lw->selected >= lw->start &&
 464             lw->selected < lw->start + lw->rows) {
 465                 curs_set(1);
 466                 wmove(lw->w, lw->selected - lw->start, 0);
 467         }
 468 }
 469
 470 bool
 471 list_window_find(struct list_window *lw,
 472                  list_window_callback_fn_t callback,
 473                  void *callback_data,
 474                  const char *str,
 475                  bool wrap,
 476                  bool bell_on_wrap)
 477 {
 478         bool h;
 479         unsigned i = lw->selected + 1;
 480         const char *label;
 481
 482         do {
 483                 while (i < lw->length) {
 484                         label = callback(i, &h, NULL, callback_data);
 485                         assert(label != NULL);
 486
 487                         if (str && label && match_line(label, str)) {
 488                                 list_window_move_cursor(lw, i);
 489                                 return true;
 490                         }
 491                         if (wrap && i == lw->selected)
 492                                 return false;
 493                         i++;
 494                 }
 495                 if (wrap) {
 496                         if (i == 0) /* empty list */
 497                                 return 1;
 498                         i=0; /* first item */
 499                         if (bell_on_wrap) {
 500                                 screen_bell();
 501                         }
 502                 }
 503         } while (wrap);
 504
 505         return false;
 506 }
 507
 508 bool
 509 list_window_rfind(struct list_window *lw,
 510                   list_window_callback_fn_t callback,
 511                   void *callback_data,
 512                   const char *str,
 513                   bool wrap,
 514                   bool bell_on_wrap)
 515 {
 516         bool h;
 517         int i = lw->selected - 1;
 518         const char *label;
 519
 520         if (lw->length == 0)
 521                 return false;
 522
 523         do {
 524                 while (i >= 0) {
 525                         label = callback(i, &h, NULL, callback_data);
 526                         assert(label != NULL);
 527
 528                         if( str && label && match_line(label, str) ) {
 529                                 list_window_move_cursor(lw, i);
 530                                 return true;
 531                         }
 532                         if (wrap && i == (int)lw->selected)
 533                                 return false;
 534                         i--;
 535                 }
 536                 if (wrap) {
 537                         i = lw->length - 1; /* last item */
 538                         if (bell_on_wrap) {
 539                                 screen_bell();
 540                         }
 541                 }
 542         } while (wrap);
 543
 544         return false;
 545 }
 546
 547 bool
 548 list_window_jump(struct list_window *lw,
 549                  list_window_callback_fn_t callback,
 550                  void *callback_data,
 551                  const char *str)
 552 {
 553         bool h;
 554         const char *label;
 555
 556         for (unsigned i = 0; i < lw->length; ++i) {
 557                 label = callback(i, &h, NULL, callback_data);
 558                 assert(label != NULL);
 559
 560                 if (label[0] == '[')
 561                         label++;
 562 #ifndef NCMPC_MINI
 563                 if (str && label &&
 564                                 ((options.jump_prefix_only && g_ascii_strncasecmp(label, str, strlen(str)) == 0) ||
 565                                  (!options.jump_prefix_only && match_line(label, str))) )
 566 #else
 567                 if (str && label && g_ascii_strncasecmp(label, str, strlen(str)) == 0)
 568 #endif
 569                 {
 570                         list_window_move_cursor(lw, i);
 571                         return true;
 572                 }
 573         }
 574         return false;
 575 }
 576
 577 /* perform basic list window commands (movement) */
 578 bool
 579 list_window_cmd(struct list_window *lw, command_t cmd)
 580 {
 581         switch (cmd) {
 582         case CMD_LIST_PREVIOUS:
 583                 list_window_previous(lw);
 584                 break;
 585         case CMD_LIST_NEXT:
 586                 list_window_next(lw);
 587                 break;
 588         case CMD_LIST_TOP:
 589                 list_window_top(lw);
 590                 break;
 591         case CMD_LIST_MIDDLE:
 592                 list_window_middle(lw);
 593                 break;
 594         case CMD_LIST_BOTTOM:
 595                 list_window_bottom(lw);
 596                 break;
 597         case CMD_LIST_FIRST:
 598                 list_window_first(lw);
 599                 break;
 600         case CMD_LIST_LAST:
 601                 list_window_last(lw);
 602                 break;
 603         case CMD_LIST_NEXT_PAGE:
 604                 list_window_next_page(lw);
 605                 break;
 606         case CMD_LIST_PREVIOUS_PAGE:
 607                 list_window_previous_page(lw);
 608                 break;
 609         case CMD_LIST_RANGE_SELECT:
 610                 if(lw->range_selection)
 611                 {
 612                         screen_status_printf(_("Range selection disabled"));
 613                         list_window_set_cursor(lw, lw->selected);
 614                 }
 615                 else
 616                 {
 617                         screen_status_printf(_("Range selection enabled"));
 618                         lw->range_base = lw->selected;
 619                         lw->range_selection = true;
 620                 }
 621                 break;
 622         case CMD_LIST_SCROLL_UP_LINE:
 623                 list_window_scroll_up(lw, 1);
 624                 break;
 625         case CMD_LIST_SCROLL_DOWN_LINE:
 626                 list_window_scroll_down(lw, 1);
 627                 break;
 628         case CMD_LIST_SCROLL_UP_HALF:
 629                 list_window_scroll_up(lw, (lw->rows - 1) / 2);
 630                 break;
 631         case CMD_LIST_SCROLL_DOWN_HALF:
 632                 list_window_scroll_down(lw, (lw->rows - 1) / 2);
 633                 break;
 634         default:
 635                 return false;
 636         }
 637
 638         return true;
 639 }
 640
 641 bool
 642 list_window_scroll_cmd(struct list_window *lw, command_t cmd)
 643 {
 644         switch (cmd) {
 645         case CMD_LIST_SCROLL_UP_LINE:
 646         case CMD_LIST_PREVIOUS:
 647                 if (lw->start > 0)
 648                         lw->start--;
 649                 break;
 650
 651         case CMD_LIST_SCROLL_DOWN_LINE:
 652         case CMD_LIST_NEXT:
 653                 if (lw->start + lw->rows < lw->length)
 654                         lw->start++;
 655                 break;
 656
 657         case CMD_LIST_FIRST:
 658                 lw->start = 0;
 659                 break;
 660
 661         case CMD_LIST_LAST:
 662                 if (lw->length > lw->rows)
 663                         lw->start = lw->length - lw->rows;
 664                 else
 665                         lw->start = 0;
 666                 break;
 667
 668         case CMD_LIST_NEXT_PAGE:
 669                 lw->start += lw->rows - 1;
 670                 if (lw->start + lw->rows > lw->length) {
 671                         if (lw->length > lw->rows)
 672                                 lw->start = lw->length - lw->rows;
 673                         else
 674                                 lw->start = 0;
 675                 }
 676                 break;
 677
 678         case CMD_LIST_PREVIOUS_PAGE:
 679                 if (lw->start > lw->rows)
 680                         lw->start -= lw->rows;
 681                 else
 682                         lw->start = 0;
 683                 break;
 684
 685         case CMD_LIST_SCROLL_UP_HALF:
 686                 if (lw->start > (lw->rows - 1) / 2)
 687                         lw->start -= (lw->rows - 1) / 2;
 688                 else
 689                         lw->start = 0;
 690                 break;
 691
 692         case CMD_LIST_SCROLL_DOWN_HALF:
 693                 lw->start += (lw->rows - 1) / 2;
 694                 if (lw->start + lw->rows > lw->length) {
 695                         if (lw->length > lw->rows)
 696                                 lw->start = lw->length - lw->rows;
 697                         else
 698                                 lw->start = 0;
 699                 }
 700                 break;
 701
 702         default:
 703                 return false;
 704         }
 705
 706         return true;
 707 }
 708
 709 #ifdef HAVE_GETMOUSE
 710 bool
 711 list_window_mouse(struct list_window *lw, unsigned long bstate, int y)
 712 {
 713         assert(lw != NULL);
 714
 715         /* if the even occurred above the list window move up */
 716         if (y < 0) {
 717                 if (bstate & BUTTON3_CLICKED)
 718                         list_window_first(lw);
 719                 else
 720                         list_window_previous_page(lw);
 721                 return true;
 722         }
 723
 724         /* if the even occurred below the list window move down */
 725         if ((unsigned)y >= lw->length) {
 726                 if (bstate & BUTTON3_CLICKED)
 727                         list_window_last(lw);
 728                 else
 729                         list_window_next_page(lw);
 730                 return true;
 731         }
 732
 733         return false;
 734 }
 735 #endif