src/list_window.c

   1 /*
   2  * (c) 2004 by Kalle Wallin <kaw@linux.se>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software
  15  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  16  *
  17  */
  18
  19 #include "list_window.h"
  20 #include "config.h"
  21 #include "options.h"
  22 #include "charset.h"
  23 #include "support.h"
  24 #include "command.h"
  25 #include "colors.h"
  26
  27 #include <assert.h>
  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         return lw;
  44 }
  45
  46 void
  47 list_window_free(struct list_window *lw)
  48 {
  49         if (lw) {
  50                 memset(lw, 0, sizeof(list_window_t));
  51                 g_free(lw);
  52         }
  53 }
  54
  55 void
  56 list_window_reset(struct list_window *lw)
  57 {
  58         lw->selected = 0;
  59         lw->xoffset = 0;
  60         lw->start = 0;
  61 }
  62
  63 void
  64 list_window_check_selected(struct list_window *lw, unsigned length)
  65 {
  66         if (lw->start + lw->rows > length) {
  67                 if (length > lw->rows)
  68                         lw->start = length - lw->rows;
  69                 else
  70                         lw->start = 0;
  71         }
  72
  73         if (lw->selected < lw->start)
  74                 lw->selected = lw->start;
  75
  76         if (length > 0 && lw->selected >= length)
  77                 lw->selected = length - 1;
  78 }
  79
  80 void
  81 list_window_center(struct list_window *lw, unsigned rows, unsigned n)
  82 {
  83         if (n > lw->rows / 2)
  84                 lw->start = n - lw->rows / 2;
  85         else
  86                 lw->start = 0;
  87
  88         if (lw->start + lw->rows > rows) {
  89                 if (lw->rows < rows)
  90                         lw->start = rows - lw->rows;
  91                 else
  92                         lw->start = 0;
  93         }
  94 }
  95
  96 void
  97 list_window_set_selected(struct list_window *lw, unsigned n)
  98 {
  99         lw->selected = n;
 100 }
 101
 102 static void
 103 list_window_next(struct list_window *lw, unsigned length)
 104 {
 105         if (lw->selected + 1 < length)
 106                 lw->selected++;
 107         else if (options.list_wrap)
 108                 lw->selected = 0;
 109 }
 110
 111 static void
 112 list_window_previous(struct list_window *lw, unsigned length)
 113 {
 114         if (lw->selected > 0)
 115                 lw->selected--;
 116         else if (options.list_wrap)
 117                 lw->selected = length - 1;
 118 }
 119
 120 static void
 121 list_window_first(struct list_window *lw)
 122 {
 123         lw->xoffset = 0;
 124         lw->selected = 0;
 125 }
 126
 127 static void
 128 list_window_last(struct list_window *lw, unsigned length)
 129 {
 130         lw->xoffset = 0;
 131         if (length > 0)
 132                 lw->selected = length - 1;
 133         else
 134                 lw->selected = 0;
 135 }
 136
 137 static void
 138 list_window_next_page(struct list_window *lw, unsigned length)
 139 {
 140         if (lw->rows < 2)
 141                 return;
 142         if (lw->selected + lw->rows < length)
 143                 lw->selected += lw->rows - 1;
 144         else
 145                 list_window_last(lw, length);
 146 }
 147
 148 static void
 149 list_window_previous_page(struct list_window *lw)
 150 {
 151         if (lw->rows < 2)
 152                 return;
 153         if (lw->selected > lw->rows - 1)
 154                 lw->selected -= lw->rows - 1;
 155         else
 156                 list_window_first(lw);
 157 }
 158
 159
 160 void
 161 list_window_paint(struct list_window *lw,
 162                   list_window_callback_fn_t callback,
 163                   void *callback_data)
 164 {
 165         unsigned i;
 166         int fill = options.wide_cursor;
 167         int show_cursor = !(lw->flags & LW_HIDE_CURSOR);
 168
 169         if (show_cursor) {
 170                 if (lw->selected < lw->start)
 171                         lw->start = lw->selected;
 172
 173                 if (lw->selected >= lw->start + lw->rows)
 174                         lw->start = lw->selected - lw->rows + 1;
 175         }
 176
 177         for (i = 0; i < lw->rows; i++) {
 178                 int highlight = 0;
 179                 const char *label;
 180
 181                 label = callback(lw->start + i, &highlight, callback_data);
 182                 wmove(lw->w, i, 0);
 183
 184                 if (label) {
 185                         int selected = lw->start + i == lw->selected;
 186                         unsigned len = utf8_width(label);
 187
 188                         if (highlight)
 189                                 colors_use(lw->w, COLOR_LIST_BOLD);
 190                         else
 191                                 colors_use(lw->w, COLOR_LIST);
 192
 193                         if (show_cursor && selected)
 194                                 wattron(lw->w, A_REVERSE);
 195
 196                         //waddnstr(lw->w, label, lw->cols);
 197                         waddstr(lw->w, label);
 198                         if (fill && len < lw->cols)
 199                                 whline(lw->w,  ' ', lw->cols-len);
 200
 201                         if (selected)
 202                                 wattroff(lw->w, A_REVERSE);
 203
 204                         if (!fill && len < lw->cols)
 205                                 wclrtoeol(lw->w);
 206                 } else
 207                         wclrtoeol(lw->w);
 208         }
 209 }
 210
 211 int
 212 list_window_find(struct list_window *lw,
 213                  list_window_callback_fn_t callback,
 214                  void *callback_data,
 215                  const char *str,
 216                  int wrap)
 217 {
 218         int h;
 219         unsigned i = lw->selected + 1;
 220         const char *label;
 221
 222         while (wrap || i == lw->selected + 1) {
 223                 while ((label = callback(i,&h,callback_data))) {
 224                         if (str && label && strcasestr(label, str)) {
 225                                 lw->selected = i;
 226                                 return 0;
 227                         }
 228                         if (wrap && i == lw->selected)
 229                                 return 1;
 230                         i++;
 231                 }
 232                 if (wrap) {
 233                         if (i == 0) /* empty list */
 234                                 return 1;
 235                         i=0; /* first item */
 236                         screen_bell();
 237                 }
 238         }
 239
 240         return 1;
 241 }
 242
 243 int
 244 list_window_rfind(struct list_window *lw,
 245                   list_window_callback_fn_t callback,
 246                   void *callback_data,
 247                   const char *str,
 248                   int wrap,
 249                   unsigned rows)
 250 {
 251         int h;
 252         int i = lw->selected - 1;
 253         const char *label;
 254
 255         if (rows == 0)
 256                 return 1;
 257
 258         while (wrap || i == (int)lw->selected - 1) {
 259                 while (i >= 0 && (label = callback(i,&h,callback_data))) {
 260                         if( str && label && strcasestr(label, str) ) {
 261                                 lw->selected = i;
 262                                 return 0;
 263                         }
 264                         if (wrap && i == (int)lw->selected)
 265                                 return 1;
 266                         i--;
 267                 }
 268                 if (wrap) {
 269                         i = rows - 1; /* last item */
 270                         screen_bell();
 271                 }
 272         }
 273         return 1;
 274 }
 275
 276 /* perform basic list window commands (movement) */
 277 int
 278 list_window_cmd(struct list_window *lw, unsigned rows, command_t cmd)
 279 {
 280         switch (cmd) {
 281         case CMD_LIST_PREVIOUS:
 282                 list_window_previous(lw, rows);
 283                 break;
 284         case CMD_LIST_NEXT:
 285                 list_window_next(lw, rows);
 286                 break;
 287         case CMD_LIST_FIRST:
 288                 list_window_first(lw);
 289                 break;
 290         case CMD_LIST_LAST:
 291                 list_window_last(lw, rows);
 292                 break;
 293         case CMD_LIST_NEXT_PAGE:
 294                 list_window_next_page(lw, rows);
 295                 break;
 296         case CMD_LIST_PREVIOUS_PAGE:
 297                 list_window_previous_page(lw);
 298                 break;
 299         default:
 300                 return 0;
 301         }
 302
 303         return 1;
 304 }
 305
 306 int
 307 list_window_scroll_cmd(struct list_window *lw, unsigned rows, command_t cmd)
 308 {
 309         switch (cmd) {
 310         case CMD_LIST_PREVIOUS:
 311                 if (lw->start > 0)
 312                         lw->start--;
 313                 break;
 314
 315         case CMD_LIST_NEXT:
 316                 if (lw->start + lw->rows < rows)
 317                         lw->start++;
 318                 break;
 319
 320         case CMD_LIST_FIRST:
 321                 lw->start = 0;
 322                 break;
 323
 324         case CMD_LIST_LAST:
 325                 if (rows > lw->rows)
 326                         lw->start = rows - lw->rows;
 327                 else
 328                         lw->start = 0;
 329                 break;
 330
 331         case CMD_LIST_NEXT_PAGE:
 332                 lw->start += lw->rows - 1;
 333                 if (lw->start + lw->rows > rows) {
 334                         if (rows > lw->rows)
 335                                 lw->start = rows - lw->rows;
 336                         else
 337                                 lw->start = 0;
 338                 }
 339                 break;
 340
 341         case CMD_LIST_PREVIOUS_PAGE:
 342                 if (lw->start > lw->rows)
 343                         lw->start -= lw->rows;
 344                 else
 345                         lw->start = 0;
 346                 break;
 347
 348         default:
 349                 return 0;
 350         }
 351
 352         return 1;
 353 }
 354
 355 #ifdef HAVE_GETMOUSE
 356 int
 357 list_window_mouse(struct list_window *lw, unsigned rows,
 358                   unsigned long bstate, int y)
 359 {
 360         assert(lw != NULL);
 361
 362         /* if the even occured above the list window move up */
 363         if (y < 0) {
 364                 if (bstate & BUTTON3_CLICKED)
 365                         list_window_first(lw);
 366                 else
 367                         list_window_previous_page(lw);
 368                 return 1;
 369         }
 370
 371         /* if the even occured below the list window move down */
 372         if ((unsigned)y >= rows) {
 373                 if (bstate & BUTTON3_CLICKED)
 374                         list_window_last(lw, rows);
 375                 else
 376                         list_window_next_page(lw, rows);
 377                 return 1;
 378         }
 379
 380         return 0;
 381 }
 382 #endif