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