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 list_window_t *
  35 list_window_init(WINDOW *w, unsigned width, unsigned height)
  36 {
  37         list_window_t *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 list_window_t *
  48 list_window_free(list_window_t *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(list_window_t *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(list_window_t *lw, unsigned length)
  69 {
  70         while (lw->start > 0 && lw->start + lw->rows > length)
  71                 lw->start--;
  72
  73         while (lw->selected < lw->start)
  74                 lw->selected++;
  75
  76         while (lw->selected > 0 && length > 0 && lw->selected >= length)
  77                 lw->selected--;
  78 }
  79
  80 void
  81 list_window_set_selected(list_window_t *lw, unsigned n)
  82 {
  83         lw->selected = n;
  84 }
  85
  86 void
  87 list_window_next(list_window_t *lw, unsigned length)
  88 {
  89         if (lw->selected + 1 < length)
  90                 lw->selected++;
  91         else if (options.list_wrap)
  92                 lw->selected = 0;
  93 }
  94
  95 void
  96 list_window_previous(list_window_t *lw, unsigned length)
  97 {
  98         if (lw->selected > 0)
  99                 lw->selected--;
 100         else if (options.list_wrap)
 101                 lw->selected = length - 1;
 102 }
 103
 104 void
 105 list_window_first(list_window_t *lw)
 106 {
 107         lw->xoffset = 0;
 108         lw->selected = 0;
 109 }
 110
 111 void
 112 list_window_last(list_window_t *lw, unsigned length)
 113 {
 114         lw->xoffset = 0;
 115         if (length > 0)
 116                 lw->selected = length - 1;
 117         else
 118                 lw->selected = 0;
 119 }
 120
 121 void
 122 list_window_next_page(list_window_t *lw, unsigned length)
 123 {
 124         if (lw->rows < 2)
 125                 return;
 126         if (lw->selected + lw->rows < length)
 127                 lw->selected += lw->rows - 1;
 128         else
 129                 return list_window_last(lw, length);
 130 }
 131
 132 void
 133 list_window_previous_page(list_window_t *lw)
 134 {
 135         if (lw->rows < 2)
 136                 return;
 137         if (lw->selected > lw->rows - 1)
 138                 lw->selected -= lw->rows - 1;
 139         else
 140                 list_window_first(lw);
 141 }
 142
 143
 144 void
 145 list_window_paint(list_window_t *lw,
 146                   list_window_callback_fn_t callback,
 147                   void *callback_data)
 148 {
 149         unsigned i;
 150         int fill = options.wide_cursor;
 151         int show_cursor = !(lw->flags & LW_HIDE_CURSOR);
 152
 153         if (show_cursor) {
 154                 while (lw->selected < lw->start) {
 155                         lw->start--;
 156                         lw->clear=1;
 157                 }
 158
 159                 while (lw->selected >= lw->start+lw->rows) {
 160                         lw->start++;
 161                         lw->clear=1;
 162                 }
 163         }
 164
 165         for (i = 0; i < lw->rows; i++) {
 166                 int highlight = 0;
 167                 const char *label;
 168
 169                 label = callback(lw->start + i, &highlight, callback_data);
 170                 wmove(lw->w, i, 0);
 171                 if( lw->clear && (!fill || !label) )
 172                         wclrtoeol(lw->w);
 173
 174                 if (label) {
 175                         int selected = lw->start + i == lw->selected;
 176                         size_t len = my_strlen(label);
 177
 178                         if( highlight )
 179                                 colors_use(lw->w, COLOR_LIST_BOLD);
 180                         else
 181                                 colors_use(lw->w, COLOR_LIST);
 182
 183                         if( show_cursor && selected )
 184                                 wattron(lw->w, A_REVERSE);
 185
 186                         //waddnstr(lw->w, label, lw->cols);
 187                         waddstr(lw->w, label);
 188                         if( fill && len<lw->cols )
 189                                 whline(lw->w,  ' ', lw->cols-len);
 190
 191                         if( selected )
 192                                 wattroff(lw->w, A_REVERSE);
 193                 }
 194         }
 195
 196         lw->clear=0;
 197 }
 198
 199 int
 200 list_window_find(list_window_t *lw,
 201                  list_window_callback_fn_t callback,
 202                  void *callback_data,
 203                  const char *str,
 204                  int wrap)
 205 {
 206         int h;
 207         unsigned i = lw->selected + 1;
 208         const char *label;
 209
 210         while (wrap || i == lw->selected + 1) {
 211                 while ((label = callback(i,&h,callback_data))) {
 212                         if (str && label && strcasestr(label, str)) {
 213                                 lw->selected = i;
 214                                 return 0;
 215                         }
 216                         if (wrap && i == lw->selected)
 217                                 return 1;
 218                         i++;
 219                 }
 220                 if (wrap) {
 221                         if (i == 0) /* empty list */
 222                                 return 1;
 223                         i=0; /* first item */
 224                         screen_bell();
 225                 }
 226         }
 227
 228         return 1;
 229 }
 230
 231 int
 232 list_window_rfind(list_window_t *lw,
 233                   list_window_callback_fn_t callback,
 234                   void *callback_data,
 235                   const char *str,
 236                   int wrap,
 237                   unsigned rows)
 238 {
 239         int h;
 240         int i = lw->selected - 1;
 241         const char *label;
 242
 243         if (rows == 0)
 244                 return 1;
 245
 246         while (wrap || i == (int)lw->selected - 1) {
 247                 while (i >= 0 && (label = callback(i,&h,callback_data))) {
 248                         if( str && label && strcasestr(label, str) ) {
 249                                 lw->selected = i;
 250                                 return 0;
 251                         }
 252                         if (wrap && i == (int)lw->selected)
 253                                 return 1;
 254                         i--;
 255                 }
 256                 if (wrap) {
 257                         i = rows - 1; /* last item */
 258                         screen_bell();
 259                 }
 260         }
 261         return 1;
 262 }
 263
 264 /* perform basic list window commands (movement) */
 265 int
 266 list_window_cmd(list_window_t *lw, unsigned rows, command_t cmd)
 267 {
 268         switch (cmd) {
 269         case CMD_LIST_PREVIOUS:
 270                 list_window_previous(lw, rows);
 271                 lw->repaint=1;
 272                 break;
 273         case CMD_LIST_NEXT:
 274                 list_window_next(lw, rows);
 275                 lw->repaint=1;
 276                 break;
 277         case CMD_LIST_FIRST:
 278                 list_window_first(lw);
 279                 lw->repaint  = 1;
 280                 break;
 281         case CMD_LIST_LAST:
 282                 list_window_last(lw, rows);
 283                 lw->repaint = 1;
 284                 break;
 285         case CMD_LIST_NEXT_PAGE:
 286                 list_window_next_page(lw, rows);
 287                 lw->repaint  = 1;
 288                 break;
 289         case CMD_LIST_PREVIOUS_PAGE:
 290                 list_window_previous_page(lw);
 291                 lw->repaint  = 1;
 292                 break;
 293         default:
 294                 return 0;
 295         }
 296
 297         return 1;
 298 }
 299
 300 list_window_state_t *
 301 list_window_init_state(void)
 302 {
 303         return g_malloc0(sizeof(list_window_state_t));
 304 }
 305
 306 list_window_state_t *
 307 list_window_free_state(list_window_state_t *state)
 308 {
 309   if( state )
 310     {
 311       if( state->list )
 312         {
 313           GList *list = state->list;
 314           while( list )
 315             {
 316               g_free(list->data);
 317               list->data = NULL;
 318               list = list->next;
 319             }
 320           g_list_free(state->list);
 321           state->list = NULL;
 322         }
 323       g_free(state);
 324     }
 325   return NULL;
 326 }
 327
 328 void
 329 list_window_push_state(list_window_state_t *state, list_window_t *lw)
 330 {
 331   if( state )
 332     {
 333       list_window_t *tmp = g_malloc(sizeof(list_window_t));
 334       memcpy(tmp, lw, sizeof(list_window_t));
 335       state->list = g_list_prepend(state->list, (gpointer) tmp);
 336       list_window_reset(lw);
 337     }
 338 }
 339
 340 bool
 341 list_window_pop_state(list_window_state_t *state, list_window_t *lw)
 342 {
 343   if( state && state->list )
 344     {
 345       list_window_t *tmp = state->list->data;
 346
 347       memcpy(lw, tmp, sizeof(list_window_t));
 348       g_free(tmp);
 349       state->list->data = NULL;
 350       state->list = g_list_delete_link(state->list, state->list);
 351     }
 352
 353   // return TRUE if there are still states in the list
 354   return (state && state->list) ? TRUE : FALSE;
 355 }