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 "match.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)
  77                 lw->selected = 0;
  78         else if (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         bool fill = options.wide_cursor;
 169         bool show_cursor = !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                 bool highlight = false;
 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                         bool 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 bool
 214 list_window_find(struct list_window *lw,
 215                  list_window_callback_fn_t callback,
 216                  void *callback_data,
 217                  const char *str,
 218                  bool wrap)
 219 {
 220         bool h;
 221         unsigned i = lw->selected + 1;
 222         const char *label;
 223
 224         do {
 225                 while ((label = callback(i,&h,callback_data))) {
 226                         if (str && label && match_line(label, str)) {
 227                                 lw->selected = i;
 228                                 return true;
 229                         }
 230                         if (wrap && i == lw->selected)
 231                                 return false;
 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         } while (wrap);
 241
 242         return false;
 243 }
 244
 245 bool
 246 list_window_rfind(struct list_window *lw,
 247                   list_window_callback_fn_t callback,
 248                   void *callback_data,
 249                   const char *str,
 250                   bool wrap,
 251                   unsigned rows)
 252 {
 253         bool h;
 254         int i = lw->selected - 1;
 255         const char *label;
 256
 257         if (rows == 0)
 258                 return false;
 259
 260         do {
 261                 while (i >= 0 && (label = callback(i,&h,callback_data))) {
 262                         if( str && label && match_line(label, str) ) {
 263                                 lw->selected = i;
 264                                 return true;
 265                         }
 266                         if (wrap && i == (int)lw->selected)
 267                                 return false;
 268                         i--;
 269                 }
 270                 if (wrap) {
 271                         i = rows - 1; /* last item */
 272                         screen_bell();
 273                 }
 274         } while (wrap);
 275
 276         return false;
 277 }
 278
 279 /* perform basic list window commands (movement) */
 280 bool
 281 list_window_cmd(struct list_window *lw, unsigned rows, command_t cmd)
 282 {
 283         switch (cmd) {
 284         case CMD_LIST_PREVIOUS:
 285                 list_window_previous(lw, rows);
 286                 break;
 287         case CMD_LIST_NEXT:
 288                 list_window_next(lw, rows);
 289                 break;
 290         case CMD_LIST_FIRST:
 291                 list_window_first(lw);
 292                 break;
 293         case CMD_LIST_LAST:
 294                 list_window_last(lw, rows);
 295                 break;
 296         case CMD_LIST_NEXT_PAGE:
 297                 list_window_next_page(lw, rows);
 298                 break;
 299         case CMD_LIST_PREVIOUS_PAGE:
 300                 list_window_previous_page(lw);
 301                 break;
 302         default:
 303                 return false;
 304         }
 305
 306         return true;
 307 }
 308
 309 bool
 310 list_window_scroll_cmd(struct list_window *lw, unsigned rows, command_t cmd)
 311 {
 312         switch (cmd) {
 313         case CMD_LIST_PREVIOUS:
 314                 if (lw->start > 0)
 315                         lw->start--;
 316                 break;
 317
 318         case CMD_LIST_NEXT:
 319                 if (lw->start + lw->rows < rows)
 320                         lw->start++;
 321                 break;
 322
 323         case CMD_LIST_FIRST:
 324                 lw->start = 0;
 325                 break;
 326
 327         case CMD_LIST_LAST:
 328                 if (rows > lw->rows)
 329                         lw->start = rows - lw->rows;
 330                 else
 331                         lw->start = 0;
 332                 break;
 333
 334         case CMD_LIST_NEXT_PAGE:
 335                 lw->start += lw->rows - 1;
 336                 if (lw->start + lw->rows > rows) {
 337                         if (rows > lw->rows)
 338                                 lw->start = rows - lw->rows;
 339                         else
 340                                 lw->start = 0;
 341                 }
 342                 break;
 343
 344         case CMD_LIST_PREVIOUS_PAGE:
 345                 if (lw->start > lw->rows)
 346                         lw->start -= lw->rows;
 347                 else
 348                         lw->start = 0;
 349                 break;
 350
 351         default:
 352                 return false;
 353         }
 354
 355         return true;
 356 }
 357
 358 #ifdef HAVE_GETMOUSE
 359 bool
 360 list_window_mouse(struct list_window *lw, unsigned rows,
 361                   unsigned long bstate, int y)
 362 {
 363         assert(lw != NULL);
 364
 365         /* if the even occured above the list window move up */
 366         if (y < 0) {
 367                 if (bstate & BUTTON3_CLICKED)
 368                         list_window_first(lw);
 369                 else
 370                         list_window_previous_page(lw);
 371                 return true;
 372         }
 373
 374         /* if the even occured below the list window move down */
 375         if ((unsigned)y >= rows) {
 376                 if (bstate & BUTTON3_CLICKED)
 377                         list_window_last(lw, rows);
 378                 else
 379                         list_window_next_page(lw, rows);
 380                 return true;
 381         }
 382
 383         return false;
 384 }
 385 #endif