src/list_window.c

   1 /*
   2  * $Id$
   3  *
   4  * (c) 2004 by Kalle Wallin <kaw@linux.se>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  *
  19  */
  20
  21 #include "list_window.h"
  22 #include "config.h"
  23 #include "options.h"
  24 #include "support.h"
  25 #include "command.h"
  26 #include "colors.h"
  27
  28 #include <assert.h>
  29 #include <stdlib.h>
  30 #include <unistd.h>
  31 #include <string.h>
  32
  33 extern void screen_bell(void);
  34
  35 struct list_window *
  36 list_window_init(WINDOW *w, unsigned width, unsigned height)
  37 {
  38         struct list_window *lw;
  39
  40         lw = g_malloc0(sizeof(list_window_t));
  41         lw->w = w;
  42         lw->cols = width;
  43         lw->rows = height;
  44         lw->clear = 1;
  45         return lw;
  46 }
  47
  48 void
  49 list_window_free(struct list_window *lw)
  50 {
  51         if (lw) {
  52                 memset(lw, 0, sizeof(list_window_t));
  53                 g_free(lw);
  54         }
  55 }
  56
  57 void
  58 list_window_reset(struct list_window *lw)
  59 {
  60         lw->selected = 0;
  61         lw->xoffset = 0;
  62         lw->start = 0;
  63         lw->clear = 1;
  64 }
  65
  66 void
  67 list_window_check_selected(struct list_window *lw, unsigned length)
  68 {
  69         if (lw->start + lw->rows > length) {
  70                 if (length > lw->rows)
  71                         lw->start = length - lw->rows;
  72                 else
  73                         lw->start = 0;
  74         }
  75
  76         if (lw->selected < lw->start)
  77                 lw->selected = lw->start;
  78
  79         if (length > 0 && lw->selected >= length)
  80                 lw->selected = length - 1;
  81 }
  82
  83 void
  84 list_window_center(struct list_window *lw, unsigned rows, unsigned n)
  85 {
  86         if (n > lw->rows / 2)
  87                 lw->start = n - lw->rows / 2;
  88         else
  89                 lw->start = 0;
  90
  91         if (lw->start + lw->rows > rows) {
  92                 if (lw->rows < rows)
  93                         lw->start = rows - lw->rows;
  94                 else
  95                         lw->start = 0;
  96         }
  97
  98         lw->repaint = lw->clear = 1;
  99 }
 100
 101 void
 102 list_window_set_selected(struct list_window *lw, unsigned n)
 103 {
 104         lw->selected = n;
 105 }
 106
 107 static void
 108 list_window_next(struct list_window *lw, unsigned length)
 109 {
 110         if (lw->selected + 1 < length)
 111                 lw->selected++;
 112         else if (options.list_wrap)
 113                 lw->selected = 0;
 114 }
 115
 116 static void
 117 list_window_previous(struct list_window *lw, unsigned length)
 118 {
 119         if (lw->selected > 0)
 120                 lw->selected--;
 121         else if (options.list_wrap)
 122                 lw->selected = length - 1;
 123 }
 124
 125 static void
 126 list_window_first(struct list_window *lw)
 127 {
 128         lw->xoffset = 0;
 129         lw->selected = 0;
 130 }
 131
 132 static void
 133 list_window_last(struct list_window *lw, unsigned length)
 134 {
 135         lw->xoffset = 0;
 136         if (length > 0)
 137                 lw->selected = length - 1;
 138         else
 139                 lw->selected = 0;
 140 }
 141
 142 static void
 143 list_window_next_page(struct list_window *lw, unsigned length)
 144 {
 145         if (lw->rows < 2)
 146                 return;
 147         if (lw->selected + lw->rows < length)
 148                 lw->selected += lw->rows - 1;
 149         else
 150                 list_window_last(lw, length);
 151 }
 152
 153 static void
 154 list_window_previous_page(struct list_window *lw)
 155 {
 156         if (lw->rows < 2)
 157                 return;
 158         if (lw->selected > lw->rows - 1)
 159                 lw->selected -= lw->rows - 1;
 160         else
 161                 list_window_first(lw);
 162 }
 163
 164
 165 void
 166 list_window_paint(struct list_window *lw,
 167                   list_window_callback_fn_t callback,
 168                   void *callback_data)
 169 {
 170         unsigned i;
 171         int fill = options.wide_cursor;
 172         int show_cursor = !(lw->flags & LW_HIDE_CURSOR);
 173
 174         if (show_cursor) {
 175                 if (lw->selected < lw->start) {
 176                         lw->start = lw->selected;
 177                         lw->clear=1;
 178                 }
 179
 180                 if (lw->selected >= lw->start + lw->rows) {
 181                         lw->start = lw->selected - lw->rows + 1;
 182                         lw->clear=1;
 183                 }
 184         }
 185
 186         for (i = 0; i < lw->rows; i++) {
 187                 int highlight = 0;
 188                 const char *label;
 189
 190                 label = callback(lw->start + i, &highlight, callback_data);
 191                 wmove(lw->w, i, 0);
 192                 if( lw->clear && (!fill || !label) )
 193                         wclrtoeol(lw->w);
 194
 195                 if (label) {
 196                         int selected = lw->start + i == lw->selected;
 197                         size_t len = my_strlen(label);
 198
 199                         if( highlight )
 200                                 colors_use(lw->w, COLOR_LIST_BOLD);
 201                         else
 202                                 colors_use(lw->w, COLOR_LIST);
 203
 204                         if( show_cursor && selected )
 205                                 wattron(lw->w, A_REVERSE);
 206
 207                         //waddnstr(lw->w, label, lw->cols);
 208                         waddstr(lw->w, label);
 209                         if( fill && len<lw->cols )
 210                                 whline(lw->w,  ' ', lw->cols-len);
 211
 212                         if( selected )
 213                                 wattroff(lw->w, A_REVERSE);
 214                 }
 215         }
 216
 217         lw->clear=0;
 218 }
 219
 220 int
 221 list_window_find(struct list_window *lw,
 222                  list_window_callback_fn_t callback,
 223                  void *callback_data,
 224                  const char *str,
 225                  int wrap)
 226 {
 227         int h;
 228         unsigned i = lw->selected + 1;
 229         const char *label;
 230
 231         while (wrap || i == lw->selected + 1) {
 232                 while ((label = callback(i,&h,callback_data))) {
 233                         if (str && label && strcasestr(label, str)) {
 234                                 lw->selected = i;
 235                                 return 0;
 236                         }
 237                         if (wrap && i == lw->selected)
 238                                 return 1;
 239                         i++;
 240                 }
 241                 if (wrap) {
 242                         if (i == 0) /* empty list */
 243                                 return 1;
 244                         i=0; /* first item */
 245                         screen_bell();
 246                 }
 247         }
 248
 249         return 1;
 250 }
 251
 252 int
 253 list_window_rfind(struct list_window *lw,
 254                   list_window_callback_fn_t callback,
 255                   void *callback_data,
 256                   const char *str,
 257                   int wrap,
 258                   unsigned rows)
 259 {
 260         int h;
 261         int i = lw->selected - 1;
 262         const char *label;
 263
 264         if (rows == 0)
 265                 return 1;
 266
 267         while (wrap || i == (int)lw->selected - 1) {
 268                 while (i >= 0 && (label = callback(i,&h,callback_data))) {
 269                         if( str && label && strcasestr(label, str) ) {
 270                                 lw->selected = i;
 271                                 return 0;
 272                         }
 273                         if (wrap && i == (int)lw->selected)
 274                                 return 1;
 275                         i--;
 276                 }
 277                 if (wrap) {
 278                         i = rows - 1; /* last item */
 279                         screen_bell();
 280                 }
 281         }
 282         return 1;
 283 }
 284
 285 /* perform basic list window commands (movement) */
 286 int
 287 list_window_cmd(struct list_window *lw, unsigned rows, command_t cmd)
 288 {
 289         switch (cmd) {
 290         case CMD_LIST_PREVIOUS:
 291                 list_window_previous(lw, rows);
 292                 break;
 293         case CMD_LIST_NEXT:
 294                 list_window_next(lw, rows);
 295                 break;
 296         case CMD_LIST_FIRST:
 297                 list_window_first(lw);
 298                 break;
 299         case CMD_LIST_LAST:
 300                 list_window_last(lw, rows);
 301                 break;
 302         case CMD_LIST_NEXT_PAGE:
 303                 list_window_next_page(lw, rows);
 304                 break;
 305         case CMD_LIST_PREVIOUS_PAGE:
 306                 list_window_previous_page(lw);
 307                 break;
 308         default:
 309                 return 0;
 310         }
 311
 312         lw->repaint  = 1;
 313         return 1;
 314 }
 315
 316 int
 317 list_window_scroll_cmd(struct list_window *lw, unsigned rows, command_t cmd)
 318 {
 319         switch (cmd) {
 320         case CMD_LIST_PREVIOUS:
 321                 if (lw->start > 0)
 322                         lw->start--;
 323                 break;
 324
 325         case CMD_LIST_NEXT:
 326                 if (lw->start + lw->rows < rows)
 327                         lw->start++;
 328                 break;
 329
 330         case CMD_LIST_FIRST:
 331                 lw->start = 0;
 332                 break;
 333
 334         case CMD_LIST_LAST:
 335                 if (rows > lw->rows)
 336                         lw->start = rows - lw->rows;
 337                 else
 338                         lw->start = 0;
 339                 break;
 340
 341         case CMD_LIST_NEXT_PAGE:
 342                 lw->start += lw->rows - 1;
 343                 if (lw->start + lw->rows > rows) {
 344                         if (rows > lw->rows)
 345                                 lw->start = rows - lw->rows;
 346                         else
 347                                 lw->start = 0;
 348                 }
 349                 break;
 350
 351         case CMD_LIST_PREVIOUS_PAGE:
 352                 if (lw->start > lw->rows)
 353                         lw->start -= lw->rows;
 354                 else
 355                         lw->start = 0;
 356                 break;
 357
 358         default:
 359                 return 0;
 360         }
 361
 362         lw->repaint = lw->clear = 1;
 363         return 1;
 364 }
 365
 366 #ifdef HAVE_GETMOUSE
 367 int
 368 list_window_mouse(struct list_window *lw, unsigned rows,
 369                   unsigned long bstate, int y)
 370 {
 371         assert(lw != NULL);
 372
 373         /* if the even occured above the list window move up */
 374         if (y < 0) {
 375                 if (bstate & BUTTON3_CLICKED)
 376                         list_window_first(lw);
 377                 else
 378                         list_window_previous_page(lw);
 379                 return 1;
 380         }
 381
 382         /* if the even occured below the list window move down */
 383         if ((unsigned)y >= rows) {
 384                 if (bstate & BUTTON3_CLICKED)
 385                         list_window_last(lw, rows);
 386                 else
 387                         list_window_next_page(lw, rows);
 388                 return 1;
 389         }
 390
 391         return 0;
 392 }
 393 #endif
 394
 395 list_window_state_t *
 396 list_window_init_state(void)
 397 {
 398         return g_malloc0(sizeof(list_window_state_t));
 399 }
 400
 401 void
 402 list_window_free_state(list_window_state_t *state)
 403 {
 404         if (state) {
 405                 if (state->list) {
 406                         GList *list = state->list;
 407
 408                         while (list) {
 409                                 g_free(list->data);
 410                                 list->data = NULL;
 411                                 list = list->next;
 412                         }
 413
 414                         g_list_free(state->list);
 415                         state->list = NULL;
 416                 }
 417
 418                 g_free(state);
 419         }
 420 }
 421
 422 void
 423 list_window_push_state(list_window_state_t *state, struct list_window *lw)
 424 {
 425         if (state) {
 426                 struct list_window *tmp = g_malloc(sizeof(list_window_t));
 427                 memcpy(tmp, lw, sizeof(list_window_t));
 428                 state->list = g_list_prepend(state->list, (gpointer) tmp);
 429                 list_window_reset(lw);
 430         }
 431 }
 432
 433 bool
 434 list_window_pop_state(list_window_state_t *state, struct list_window *lw)
 435 {
 436         if (state && state->list) {
 437                 struct list_window *tmp = state->list->data;
 438
 439                 memcpy(lw, tmp, sizeof(list_window_t));
 440                 g_free(tmp);
 441                 state->list->data = NULL;
 442                 state->list = g_list_delete_link(state->list, state->list);
 443         }
 444
 445         // return TRUE if there are still states in the list
 446         return (state && state->list) ? TRUE : FALSE;
 447 }