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 <stdlib.h>
  29 #include <unistd.h>
  30 #include <string.h>
  31
  32 extern void screen_bell(void);
  33
  34 struct list_window *
  35 list_window_init(WINDOW *w, unsigned width, unsigned height)
  36 {
  37         struct list_window *lw;
  38
  39         lw = g_malloc0(sizeof(list_window_t));
  40         lw->w = w;
  41         lw->cols = width;
  42         lw->rows = height;
  43         lw->clear = 1;
  44         return lw;
  45 }
  46
  47 struct list_window *
  48 list_window_free(struct list_window *lw)
  49 {
  50         if (lw) {
  51                 memset(lw, 0, sizeof(list_window_t));
  52                 g_free(lw);
  53         }
  54
  55         return NULL;
  56 }
  57
  58 void
  59 list_window_reset(struct list_window *lw)
  60 {
  61         lw->selected = 0;
  62         lw->xoffset = 0;
  63         lw->start = 0;
  64         lw->clear = 1;
  65 }
  66
  67 void
  68 list_window_check_selected(struct list_window *lw, unsigned length)
  69 {
  70         if (lw->start + lw->rows > length) {
  71                 if (length > lw->rows)
  72                         lw->start = length - lw->rows;
  73                 else
  74                         lw->start = 0;
  75         }
  76
  77         if (lw->selected < lw->start)
  78                 lw->selected = lw->start;
  79
  80         if (length > 0 && lw->selected >= length)
  81                 lw->selected = length - 1;
  82 }
  83
  84 void
  85 list_window_center(struct list_window *lw, unsigned rows, unsigned n)
  86 {
  87         if (n > lw->rows / 2)
  88                 lw->start = n - lw->rows / 2;
  89         else
  90                 lw->start = 0;
  91
  92         if (lw->start + lw->rows > rows) {
  93                 if (lw->rows < rows)
  94                         lw->start = rows - lw->rows;
  95                 else
  96                         lw->start = 0;
  97         }
  98
  99         lw->repaint = lw->clear = 1;
 100 }
 101
 102 void
 103 list_window_set_selected(struct list_window *lw, unsigned n)
 104 {
 105         lw->selected = n;
 106 }
 107
 108 void
 109 list_window_next(struct list_window *lw, unsigned length)
 110 {
 111         if (lw->selected + 1 < length)
 112                 lw->selected++;
 113         else if (options.list_wrap)
 114                 lw->selected = 0;
 115 }
 116
 117 void
 118 list_window_previous(struct list_window *lw, unsigned length)
 119 {
 120         if (lw->selected > 0)
 121                 lw->selected--;
 122         else if (options.list_wrap)
 123                 lw->selected = length - 1;
 124 }
 125
 126 void
 127 list_window_first(struct list_window *lw)
 128 {
 129         lw->xoffset = 0;
 130         lw->selected = 0;
 131 }
 132
 133 void
 134 list_window_last(struct list_window *lw, unsigned length)
 135 {
 136         lw->xoffset = 0;
 137         if (length > 0)
 138                 lw->selected = length - 1;
 139         else
 140                 lw->selected = 0;
 141 }
 142
 143 void
 144 list_window_next_page(struct list_window *lw, unsigned length)
 145 {
 146         if (lw->rows < 2)
 147                 return;
 148         if (lw->selected + lw->rows < length)
 149                 lw->selected += lw->rows - 1;
 150         else
 151                 return list_window_last(lw, length);
 152 }
 153
 154 void
 155 list_window_previous_page(struct list_window *lw)
 156 {
 157         if (lw->rows < 2)
 158                 return;
 159         if (lw->selected > lw->rows - 1)
 160                 lw->selected -= lw->rows - 1;
 161         else
 162                 list_window_first(lw);
 163 }
 164
 165
 166 void
 167 list_window_paint(struct list_window *lw,
 168                   list_window_callback_fn_t callback,
 169                   void *callback_data)
 170 {
 171         unsigned i;
 172         int fill = options.wide_cursor;
 173         int show_cursor = !(lw->flags & LW_HIDE_CURSOR);
 174
 175         if (show_cursor) {
 176                 if (lw->selected < lw->start) {
 177                         lw->start = lw->selected;
 178                         lw->clear=1;
 179                 }
 180
 181                 if (lw->selected >= lw->start + lw->rows) {
 182                         lw->start = lw->selected - lw->rows + 1;
 183                         lw->clear=1;
 184                 }
 185         }
 186
 187         for (i = 0; i < lw->rows; i++) {
 188                 int highlight = 0;
 189                 const char *label;
 190
 191                 label = callback(lw->start + i, &highlight, callback_data);
 192                 wmove(lw->w, i, 0);
 193                 if( lw->clear && (!fill || !label) )
 194                         wclrtoeol(lw->w);
 195
 196                 if (label) {
 197                         int selected = lw->start + i == lw->selected;
 198                         size_t len = my_strlen(label);
 199
 200                         if( highlight )
 201                                 colors_use(lw->w, COLOR_LIST_BOLD);
 202                         else
 203                                 colors_use(lw->w, COLOR_LIST);
 204
 205                         if( show_cursor && selected )
 206                                 wattron(lw->w, A_REVERSE);
 207
 208                         //waddnstr(lw->w, label, lw->cols);
 209                         waddstr(lw->w, label);
 210                         if( fill && len<lw->cols )
 211                                 whline(lw->w,  ' ', lw->cols-len);
 212
 213                         if( selected )
 214                                 wattroff(lw->w, A_REVERSE);
 215                 }
 216         }
 217
 218         lw->clear=0;
 219 }
 220
 221 int
 222 list_window_find(struct list_window *lw,
 223                  list_window_callback_fn_t callback,
 224                  void *callback_data,
 225                  const char *str,
 226                  int wrap)
 227 {
 228         int h;
 229         unsigned i = lw->selected + 1;
 230         const char *label;
 231
 232         while (wrap || i == lw->selected + 1) {
 233                 while ((label = callback(i,&h,callback_data))) {
 234                         if (str && label && strcasestr(label, str)) {
 235                                 lw->selected = i;
 236                                 return 0;
 237                         }
 238                         if (wrap && i == lw->selected)
 239                                 return 1;
 240                         i++;
 241                 }
 242                 if (wrap) {
 243                         if (i == 0) /* empty list */
 244                                 return 1;
 245                         i=0; /* first item */
 246                         screen_bell();
 247                 }
 248         }
 249
 250         return 1;
 251 }
 252
 253 int
 254 list_window_rfind(struct list_window *lw,
 255                   list_window_callback_fn_t callback,
 256                   void *callback_data,
 257                   const char *str,
 258                   int wrap,
 259                   unsigned rows)
 260 {
 261         int h;
 262         int i = lw->selected - 1;
 263         const char *label;
 264
 265         if (rows == 0)
 266                 return 1;
 267
 268         while (wrap || i == (int)lw->selected - 1) {
 269                 while (i >= 0 && (label = callback(i,&h,callback_data))) {
 270                         if( str && label && strcasestr(label, str) ) {
 271                                 lw->selected = i;
 272                                 return 0;
 273                         }
 274                         if (wrap && i == (int)lw->selected)
 275                                 return 1;
 276                         i--;
 277                 }
 278                 if (wrap) {
 279                         i = rows - 1; /* last item */
 280                         screen_bell();
 281                 }
 282         }
 283         return 1;
 284 }
 285
 286 /* perform basic list window commands (movement) */
 287 int
 288 list_window_cmd(struct list_window *lw, unsigned rows, command_t cmd)
 289 {
 290         switch (cmd) {
 291         case CMD_LIST_PREVIOUS:
 292                 list_window_previous(lw, rows);
 293                 break;
 294         case CMD_LIST_NEXT:
 295                 list_window_next(lw, rows);
 296                 break;
 297         case CMD_LIST_FIRST:
 298                 list_window_first(lw);
 299                 break;
 300         case CMD_LIST_LAST:
 301                 list_window_last(lw, rows);
 302                 break;
 303         case CMD_LIST_NEXT_PAGE:
 304                 list_window_next_page(lw, rows);
 305                 break;
 306         case CMD_LIST_PREVIOUS_PAGE:
 307                 list_window_previous_page(lw);
 308                 break;
 309         default:
 310                 return 0;
 311         }
 312
 313         lw->repaint  = 1;
 314         return 1;
 315 }
 316
 317 int
 318 list_window_scroll_cmd(struct list_window *lw, unsigned rows, command_t cmd)
 319 {
 320         switch (cmd) {
 321         case CMD_LIST_PREVIOUS:
 322                 if (lw->start > 0)
 323                         lw->start--;
 324                 break;
 325
 326         case CMD_LIST_NEXT:
 327                 if (lw->start + lw->rows < rows)
 328                         lw->start++;
 329                 break;
 330
 331         case CMD_LIST_FIRST:
 332                 lw->start = 0;
 333                 break;
 334
 335         case CMD_LIST_LAST:
 336                 if (rows > lw->rows)
 337                         lw->start = rows - lw->rows;
 338                 else
 339                         lw->start = 0;
 340                 break;
 341
 342         case CMD_LIST_NEXT_PAGE:
 343                 lw->start += lw->rows - 1;
 344                 if (lw->start + lw->rows > rows) {
 345                         if (rows > lw->rows)
 346                                 lw->start = rows - lw->rows;
 347                         else
 348                                 lw->start = 0;
 349                 }
 350                 break;
 351
 352         case CMD_LIST_PREVIOUS_PAGE:
 353                 if (lw->start > lw->rows)
 354                         lw->start -= lw->rows;
 355                 else
 356                         lw->start = 0;
 357                 break;
 358
 359         default:
 360                 return 0;
 361         }
 362
 363         lw->repaint = lw->clear = 1;
 364         return 1;
 365 }
 366
 367 list_window_state_t *
 368 list_window_init_state(void)
 369 {
 370         return g_malloc0(sizeof(list_window_state_t));
 371 }
 372
 373 list_window_state_t *
 374 list_window_free_state(list_window_state_t *state)
 375 {
 376         if (state) {
 377                 if (state->list) {
 378                         GList *list = state->list;
 379
 380                         while (list) {
 381                                 g_free(list->data);
 382                                 list->data = NULL;
 383                                 list = list->next;
 384                         }
 385
 386                         g_list_free(state->list);
 387                         state->list = NULL;
 388                 }
 389
 390                 g_free(state);
 391         }
 392
 393         return NULL;
 394 }
 395
 396 void
 397 list_window_push_state(list_window_state_t *state, struct list_window *lw)
 398 {
 399         if (state) {
 400                 struct list_window *tmp = g_malloc(sizeof(list_window_t));
 401                 memcpy(tmp, lw, sizeof(list_window_t));
 402                 state->list = g_list_prepend(state->list, (gpointer) tmp);
 403                 list_window_reset(lw);
 404         }
 405 }
 406
 407 bool
 408 list_window_pop_state(list_window_state_t *state, struct list_window *lw)
 409 {
 410         if (state && state->list) {
 411                 struct list_window *tmp = state->list->data;
 412
 413                 memcpy(lw, tmp, sizeof(list_window_t));
 414                 g_free(tmp);
 415                 state->list->data = NULL;
 416                 state->list = g_list_delete_link(state->list, state->list);
 417         }
 418
 419         // return TRUE if there are still states in the list
 420         return (state && state->list) ? TRUE : FALSE;
 421 }