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