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 <stdlib.h>
  22 #include <unistd.h>
  23 #include <string.h>
  24 #include <glib.h>
  25 #include <ncurses.h>
  26
  27 #include "config.h"
  28 #include "options.h"
  29 #include "support.h"
  30 #include "command.h"
  31 #include "colors.h"
  32 #include "list_window.h"
  33
  34 extern void screen_bell(void);
  35
  36 list_window_t *
  37 list_window_init(WINDOW *w, int width, int height)
  38 {
  39         list_window_t *lw;
  40
  41         lw = g_malloc0(sizeof(list_window_t));
  42         lw->w = w;
  43         lw->cols = width;
  44         lw->rows = height;
  45         lw->clear = 1;
  46         return lw;
  47 }
  48
  49 list_window_t *
  50 list_window_free(list_window_t *lw)
  51 {
  52         if (lw) {
  53                 memset(lw, 0, sizeof(list_window_t));
  54                 g_free(lw);
  55         }
  56
  57         return NULL;
  58 }
  59
  60 void
  61 list_window_reset(list_window_t *lw)
  62 {
  63         lw->selected = 0;
  64         lw->xoffset = 0;
  65         lw->start = 0;
  66         lw->clear = 1;
  67 }
  68
  69 void
  70 list_window_check_selected(list_window_t *lw, int length)
  71 {
  72         while (lw->start && lw->start + lw->rows > length)
  73                 lw->start--;
  74
  75         if (lw->selected < 0)
  76                 lw->selected = 0;
  77
  78         while (lw->selected < lw->start)
  79                 lw->selected++;
  80
  81         while (lw->selected > 0 && length > 0 && lw->selected >= length)
  82                 lw->selected--;
  83 }
  84
  85 void
  86 list_window_set_selected(list_window_t *lw, int n)
  87 {
  88         lw->selected = n;
  89 }
  90
  91 void
  92 list_window_next(list_window_t *lw, int length)
  93 {
  94         if (lw->selected < length - 1)
  95                 lw->selected++;
  96         else if (options.list_wrap)
  97                 lw->selected = 0;
  98 }
  99
 100 void
 101 list_window_previous(list_window_t *lw, int length)
 102 {
 103         if (lw->selected > 0)
 104                 lw->selected--;
 105         else if (options.list_wrap)
 106                 lw->selected = length - 1;
 107 }
 108
 109 void
 110 list_window_first(list_window_t *lw)
 111 {
 112         lw->xoffset = 0;
 113         lw->selected = 0;
 114 }
 115
 116 void
 117 list_window_last(list_window_t *lw, int length)
 118 {
 119         lw->xoffset = 0;
 120         lw->selected = length - 1;
 121 }
 122
 123 void
 124 list_window_next_page(list_window_t *lw, int length)
 125 {
 126         int step = lw->rows - 1;
 127         if (step <= 0)
 128                 return;
 129         if (lw->selected + step < length - 1)
 130                 lw->selected += step;
 131         else
 132                 return list_window_last(lw, length);
 133 }
 134
 135 void
 136 list_window_previous_page(list_window_t *lw)
 137 {
 138         int step = lw->rows - 1;
 139         if (step <= 0)
 140                 return;
 141         if (lw->selected-step > 0)
 142                 lw->selected -= step;
 143         else
 144                 list_window_first(lw);
 145 }
 146
 147
 148 void
 149 list_window_paint(list_window_t *lw,
 150                   list_window_callback_fn_t callback,
 151                   void *callback_data)
 152 {
 153         int i;
 154         int fill = options.wide_cursor;
 155         int show_cursor = !(lw->flags & LW_HIDE_CURSOR);
 156
 157         if (show_cursor) {
 158                 while (lw->selected < lw->start) {
 159                         lw->start--;
 160                         lw->clear=1;
 161                 }
 162
 163                 while (lw->selected >= lw->start+lw->rows) {
 164                         lw->start++;
 165                         lw->clear=1;
 166                 }
 167         }
 168
 169         for (i = 0; i < lw->rows; i++) {
 170                 int highlight = 0;
 171                 char *label;
 172
 173                 label = callback(lw->start + i, &highlight, callback_data);
 174                 wmove(lw->w, i, 0);
 175                 if( lw->clear && (!fill || !label) )
 176                         wclrtoeol(lw->w);
 177
 178                 if (label) {
 179                         int selected = lw->start + i == lw->selected;
 180                         size_t len = my_strlen(label);
 181
 182                         if( highlight )
 183                                 colors_use(lw->w, COLOR_LIST_BOLD);
 184                         else
 185                                 colors_use(lw->w, COLOR_LIST);
 186
 187                         if( show_cursor && selected )
 188                                 wattron(lw->w, A_REVERSE);
 189
 190                         //waddnstr(lw->w, label, lw->cols);
 191                         waddstr(lw->w, label);
 192                         if( fill && len<lw->cols )
 193                                 whline(lw->w,  ' ', lw->cols-len);
 194
 195                         if( selected )
 196                                 wattroff(lw->w, A_REVERSE);
 197                 }
 198         }
 199
 200         lw->clear=0;
 201 }
 202
 203 int
 204 list_window_find(list_window_t *lw,
 205                  list_window_callback_fn_t callback,
 206                  void *callback_data,
 207                  char *str,
 208                  int wrap)
 209 {
 210         int h;
 211         int i = lw->selected + 1;
 212         char *label;
 213
 214         while (wrap || i == lw->selected + 1) {
 215                 while ((label = callback(i,&h,callback_data))) {
 216                         if (str && label && strcasestr(label, str)) {
 217                                 lw->selected = i;
 218                                 return 0;
 219                         }
 220                         if (wrap && i == lw->selected)
 221                                 return 1;
 222                         i++;
 223                 }
 224                 if (wrap) {
 225                         if (i == 0) /* empty list */
 226                                 return 1;
 227                         i=0; /* first item */
 228                         screen_bell();
 229                 }
 230         }
 231
 232         return 1;
 233 }
 234
 235 int
 236 list_window_rfind(list_window_t *lw,
 237                   list_window_callback_fn_t callback,
 238                   void *callback_data,
 239                   char *str,
 240                   int wrap,
 241                   int rows)
 242 {
 243         int h;
 244         int i = lw->selected-1;
 245         char *label;
 246
 247         if (rows == 0)
 248                 return 1;
 249
 250         while (wrap || i == lw->selected - 1) {
 251                 while (i >= 0 && (label = callback(i,&h,callback_data))) {
 252                         if( str && label && strcasestr(label, str) ) {
 253                                 lw->selected = i;
 254                                 return 0;
 255                         }
 256                         if (wrap && i == lw->selected)
 257                                 return 1;
 258                         i--;
 259                 }
 260                 if (wrap) {
 261                         i = rows - 1; /* last item */
 262                         screen_bell();
 263                 }
 264         }
 265         return 1;
 266 }
 267
 268 /* perform basic list window commands (movement) */
 269 int
 270 list_window_cmd(list_window_t *lw, int rows, command_t cmd)
 271 {
 272         switch (cmd) {
 273         case CMD_LIST_PREVIOUS:
 274                 list_window_previous(lw, rows);
 275                 lw->repaint=1;
 276                 break;
 277         case CMD_LIST_NEXT:
 278                 list_window_next(lw, rows);
 279                 lw->repaint=1;
 280                 break;
 281         case CMD_LIST_FIRST:
 282                 list_window_first(lw);
 283                 lw->repaint  = 1;
 284                 break;
 285         case CMD_LIST_LAST:
 286                 list_window_last(lw, rows);
 287                 lw->repaint = 1;
 288                 break;
 289         case CMD_LIST_NEXT_PAGE:
 290                 list_window_next_page(lw, rows);
 291                 lw->repaint  = 1;
 292                 break;
 293         case CMD_LIST_PREVIOUS_PAGE:
 294                 list_window_previous_page(lw);
 295                 lw->repaint  = 1;
 296                 break;
 297         default:
 298                 return 0;
 299         }
 300
 301         return 1;
 302 }
 303
 304 list_window_state_t *
 305 list_window_init_state(void)
 306 {
 307         return g_malloc0(sizeof(list_window_state_t));
 308 }
 309
 310 list_window_state_t *
 311 list_window_free_state(list_window_state_t *state)
 312 {
 313   if( state )
 314     {
 315       if( state->list )
 316         {
 317           GList *list = state->list;
 318           while( list )
 319             {
 320               g_free(list->data);
 321               list->data = NULL;
 322               list = list->next;
 323             }
 324           g_list_free(state->list);
 325           state->list = NULL;
 326         }
 327       g_free(state);
 328     }
 329   return NULL;
 330 }
 331
 332 void
 333 list_window_push_state(list_window_state_t *state, list_window_t *lw)
 334 {
 335   if( state )
 336     {
 337       list_window_t *tmp = g_malloc(sizeof(list_window_t));
 338       memcpy(tmp, lw, sizeof(list_window_t));
 339       state->list = g_list_prepend(state->list, (gpointer) tmp);
 340       list_window_reset(lw);
 341     }
 342 }
 343
 344 bool
 345 list_window_pop_state(list_window_state_t *state, list_window_t *lw)
 346 {
 347   if( state && state->list )
 348     {
 349       list_window_t *tmp = state->list->data;
 350
 351       memcpy(lw, tmp, sizeof(list_window_t));
 352       g_free(tmp);
 353       state->list->data = NULL;
 354       state->list = g_list_delete_link(state->list, state->list);
 355     }
 356
 357   // return TRUE if there are still states in the list
 358   return (state && state->list) ? TRUE : FALSE;
 359 }