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 "charset.h"
  25 #include "support.h"
  26 #include "command.h"
  27 #include "colors.h"
  28
  29 #include <assert.h>
  30 #include <stdlib.h>
  31 #include <unistd.h>
  32 #include <string.h>
  33
  34 extern void screen_bell(void);
  35
  36 struct list_window *
  37 list_window_init(WINDOW *w, unsigned width, unsigned height)
  38 {
  39         struct list_window *lw;
  40
  41         lw = g_malloc0(sizeof(list_window_t));
  42         lw->w = w;
  43         lw->cols = width;
  44         lw->rows = height;
  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 }
  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
  98 void
  99 list_window_set_selected(struct list_window *lw, unsigned n)
 100 {
 101         lw->selected = n;
 102 }
 103
 104 static void
 105 list_window_next(struct list_window *lw, unsigned length)
 106 {
 107         if (lw->selected + 1 < length)
 108                 lw->selected++;
 109         else if (options.list_wrap)
 110                 lw->selected = 0;
 111 }
 112
 113 static void
 114 list_window_previous(struct list_window *lw, unsigned length)
 115 {
 116         if (lw->selected > 0)
 117                 lw->selected--;
 118         else if (options.list_wrap)
 119                 lw->selected = length - 1;
 120 }
 121
 122 static void
 123 list_window_first(struct list_window *lw)
 124 {
 125         lw->xoffset = 0;
 126         lw->selected = 0;
 127 }
 128
 129 static void
 130 list_window_last(struct list_window *lw, unsigned length)
 131 {
 132         lw->xoffset = 0;
 133         if (length > 0)
 134                 lw->selected = length - 1;
 135         else
 136                 lw->selected = 0;
 137 }
 138
 139 static void
 140 list_window_next_page(struct list_window *lw, unsigned length)
 141 {
 142         if (lw->rows < 2)
 143                 return;
 144         if (lw->selected + lw->rows < length)
 145                 lw->selected += lw->rows - 1;
 146         else
 147                 list_window_last(lw, length);
 148 }
 149
 150 static void
 151 list_window_previous_page(struct list_window *lw)
 152 {
 153         if (lw->rows < 2)
 154                 return;
 155         if (lw->selected > lw->rows - 1)
 156                 lw->selected -= lw->rows - 1;
 157         else
 158                 list_window_first(lw);
 159 }
 160
 161
 162 void
 163 list_window_paint(struct list_window *lw,
 164                   list_window_callback_fn_t callback,
 165                   void *callback_data)
 166 {
 167         unsigned i;
 168         int fill = options.wide_cursor;
 169         int show_cursor = !(lw->flags & LW_HIDE_CURSOR);
 170
 171         if (show_cursor) {
 172                 if (lw->selected < lw->start)
 173                         lw->start = lw->selected;
 174
 175                 if (lw->selected >= lw->start + lw->rows)
 176                         lw->start = lw->selected - lw->rows + 1;
 177         }
 178
 179         for (i = 0; i < lw->rows; i++) {
 180                 int highlight = 0;
 181                 const char *label;
 182
 183                 label = callback(lw->start + i, &highlight, callback_data);
 184                 wmove(lw->w, i, 0);
 185
 186                 if (label) {
 187                         int selected = lw->start + i == lw->selected;
 188                         unsigned len = utf8_width(label);
 189
 190                         if (highlight)
 191                                 colors_use(lw->w, COLOR_LIST_BOLD);
 192                         else
 193                                 colors_use(lw->w, COLOR_LIST);
 194
 195                         if (show_cursor && selected)
 196                                 wattron(lw->w, A_REVERSE);
 197
 198                         //waddnstr(lw->w, label, lw->cols);
 199                         waddstr(lw->w, label);
 200                         if (fill && len < lw->cols)
 201                                 whline(lw->w,  ' ', lw->cols-len);
 202
 203                         if (selected)
 204                                 wattroff(lw->w, A_REVERSE);
 205
 206                         if (!fill && len < lw->cols)
 207                                 wclrtoeol(lw->w);
 208                 } else
 209                         wclrtoeol(lw->w);
 210         }
 211 }
 212
 213 int
 214 list_window_find(struct list_window *lw,
 215                  list_window_callback_fn_t callback,
 216                  void *callback_data,
 217                  const char *str,
 218                  int wrap)
 219 {
 220         int h;
 221         unsigned i = lw->selected + 1;
 222         const char *label;
 223
 224         while (wrap || i == lw->selected + 1) {
 225                 while ((label = callback(i,&h,callback_data))) {
 226                         if (str && label && strcasestr(label, str)) {
 227                                 lw->selected = i;
 228                                 return 0;
 229                         }
 230                         if (wrap && i == lw->selected)
 231                                 return 1;
 232                         i++;
 233                 }
 234                 if (wrap) {
 235                         if (i == 0) /* empty list */
 236                                 return 1;
 237                         i=0; /* first item */
 238                         screen_bell();
 239                 }
 240         }
 241
 242         return 1;
 243 }
 244
 245 int
 246 list_window_rfind(struct list_window *lw,
 247                   list_window_callback_fn_t callback,
 248                   void *callback_data,
 249                   const char *str,
 250                   int wrap,
 251                   unsigned rows)
 252 {
 253         int h;
 254         int i = lw->selected - 1;
 255         const char *label;
 256
 257         if (rows == 0)
 258                 return 1;
 259
 260         while (wrap || i == (int)lw->selected - 1) {
 261                 while (i >= 0 && (label = callback(i,&h,callback_data))) {
 262                         if( str && label && strcasestr(label, str) ) {
 263                                 lw->selected = i;
 264                                 return 0;
 265                         }
 266                         if (wrap && i == (int)lw->selected)
 267                                 return 1;
 268                         i--;
 269                 }
 270                 if (wrap) {
 271                         i = rows - 1; /* last item */
 272                         screen_bell();
 273                 }
 274         }
 275         return 1;
 276 }
 277
 278 /* perform basic list window commands (movement) */
 279 int
 280 list_window_cmd(struct list_window *lw, unsigned rows, command_t cmd)
 281 {
 282         switch (cmd) {
 283         case CMD_LIST_PREVIOUS:
 284                 list_window_previous(lw, rows);
 285                 break;
 286         case CMD_LIST_NEXT:
 287                 list_window_next(lw, rows);
 288                 break;
 289         case CMD_LIST_FIRST:
 290                 list_window_first(lw);
 291                 break;
 292         case CMD_LIST_LAST:
 293                 list_window_last(lw, rows);
 294                 break;
 295         case CMD_LIST_NEXT_PAGE:
 296                 list_window_next_page(lw, rows);
 297                 break;
 298         case CMD_LIST_PREVIOUS_PAGE:
 299                 list_window_previous_page(lw);
 300                 break;
 301         default:
 302                 return 0;
 303         }
 304
 305         return 1;
 306 }
 307
 308 int
 309 list_window_scroll_cmd(struct list_window *lw, unsigned rows, command_t cmd)
 310 {
 311         switch (cmd) {
 312         case CMD_LIST_PREVIOUS:
 313                 if (lw->start > 0)
 314                         lw->start--;
 315                 break;
 316
 317         case CMD_LIST_NEXT:
 318                 if (lw->start + lw->rows < rows)
 319                         lw->start++;
 320                 break;
 321
 322         case CMD_LIST_FIRST:
 323                 lw->start = 0;
 324                 break;
 325
 326         case CMD_LIST_LAST:
 327                 if (rows > lw->rows)
 328                         lw->start = rows - lw->rows;
 329                 else
 330                         lw->start = 0;
 331                 break;
 332
 333         case CMD_LIST_NEXT_PAGE:
 334                 lw->start += lw->rows - 1;
 335                 if (lw->start + lw->rows > rows) {
 336                         if (rows > lw->rows)
 337                                 lw->start = rows - lw->rows;
 338                         else
 339                                 lw->start = 0;
 340                 }
 341                 break;
 342
 343         case CMD_LIST_PREVIOUS_PAGE:
 344                 if (lw->start > lw->rows)
 345                         lw->start -= lw->rows;
 346                 else
 347                         lw->start = 0;
 348                 break;
 349
 350         default:
 351                 return 0;
 352         }
 353
 354         return 1;
 355 }
 356
 357 #ifdef HAVE_GETMOUSE
 358 int
 359 list_window_mouse(struct list_window *lw, unsigned rows,
 360                   unsigned long bstate, int y)
 361 {
 362         assert(lw != NULL);
 363
 364         /* if the even occured above the list window move up */
 365         if (y < 0) {
 366                 if (bstate & BUTTON3_CLICKED)
 367                         list_window_first(lw);
 368                 else
 369                         list_window_previous_page(lw);
 370                 return 1;
 371         }
 372
 373         /* if the even occured below the list window move down */
 374         if ((unsigned)y >= rows) {
 375                 if (bstate & BUTTON3_CLICKED)
 376                         list_window_last(lw, rows);
 377                 else
 378                         list_window_next_page(lw, rows);
 379                 return 1;
 380         }
 381
 382         return 0;
 383 }
 384 #endif
 385
 386 list_window_state_t *
 387 list_window_init_state(void)
 388 {
 389         return g_malloc0(sizeof(list_window_state_t));
 390 }
 391
 392 void
 393 list_window_free_state(list_window_state_t *state)
 394 {
 395         if (state) {
 396                 if (state->list) {
 397                         GList *list = state->list;
 398
 399                         while (list) {
 400                                 g_free(list->data);
 401                                 list->data = NULL;
 402                                 list = list->next;
 403                         }
 404
 405                         g_list_free(state->list);
 406                         state->list = NULL;
 407                 }
 408
 409                 g_free(state);
 410         }
 411 }
 412
 413 void
 414 list_window_push_state(list_window_state_t *state, struct list_window *lw)
 415 {
 416         if (state) {
 417                 struct list_window *tmp = g_malloc(sizeof(list_window_t));
 418                 memcpy(tmp, lw, sizeof(list_window_t));
 419                 state->list = g_list_prepend(state->list, (gpointer) tmp);
 420                 list_window_reset(lw);
 421         }
 422 }
 423
 424 bool
 425 list_window_pop_state(list_window_state_t *state, struct list_window *lw)
 426 {
 427         if (state && state->list) {
 428                 struct list_window *tmp = state->list->data;
 429
 430                 memcpy(lw, tmp, sizeof(list_window_t));
 431                 g_free(tmp);
 432                 state->list->data = NULL;
 433                 state->list = g_list_delete_link(state->list, state->list);
 434         }
 435
 436         // return TRUE if there are still states in the list
 437         return (state && state->list) ? TRUE : FALSE;
 438 }