src/list_window.c

   1 /* ncmpc (Ncurses MPD Client)
   2  * (c) 2004-2009 The Music Player Daemon Project
   3  * Project homepage: http://musicpd.org
   4
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "list_window.h"
  21 #include "config.h"
  22 #include "options.h"
  23 #include "charset.h"
  24 #include "match.h"
  25 #include "command.h"
  26 #include "colors.h"
  27
  28 #include <assert.h>
  29 #include <stdlib.h>
  30 #include <unistd.h>
  31 #include <string.h>
  32
  33 extern void screen_bell(void);
  34
  35 struct list_window *
  36 list_window_init(WINDOW *w, unsigned width, unsigned height)
  37 {
  38         struct list_window *lw;
  39
  40         lw = g_malloc0(sizeof(list_window_t));
  41         lw->w = w;
  42         lw->cols = width;
  43         lw->rows = height;
  44         return lw;
  45 }
  46
  47 void
  48 list_window_free(struct list_window *lw)
  49 {
  50         if (lw) {
  51                 memset(lw, 0, sizeof(list_window_t));
  52                 g_free(lw);
  53         }
  54 }
  55
  56 void
  57 list_window_reset(struct list_window *lw)
  58 {
  59         lw->selected = 0;
  60         lw->xoffset = 0;
  61         lw->start = 0;
  62 }
  63
  64 void
  65 list_window_check_selected(struct list_window *lw, unsigned length)
  66 {
  67         if (lw->start + lw->rows > length) {
  68                 if (length > lw->rows)
  69                         lw->start = length - lw->rows;
  70                 else
  71                         lw->start = 0;
  72         }
  73
  74         if (lw->selected < lw->start)
  75                 lw->selected = lw->start;
  76
  77         if (length == 0)
  78                 lw->selected = 0;
  79         else if (lw->selected >= length)
  80                 lw->selected = length - 1;
  81 }
  82
  83 void
  84 list_window_center(struct list_window *lw, unsigned rows, unsigned n)
  85 {
  86         if (n > lw->rows / 2)
  87                 lw->start = n - lw->rows / 2;
  88         else
  89                 lw->start = 0;
  90
  91         if (lw->start + lw->rows > rows) {
  92                 if (lw->rows < rows)
  93                         lw->start = rows - lw->rows;
  94                 else
  95                         lw->start = 0;
  96         }
  97 }
  98
  99 void
 100 list_window_set_selected(struct list_window *lw, unsigned n)
 101 {
 102         lw->selected = n;
 103 }
 104
 105 static void
 106 list_window_next(struct list_window *lw, unsigned length)
 107 {
 108         if (lw->selected + 1 < length)
 109                 lw->selected++;
 110         else if (options.list_wrap)
 111                 lw->selected = 0;
 112 }
 113
 114 static void
 115 list_window_previous(struct list_window *lw, unsigned length)
 116 {
 117         if (lw->selected > 0)
 118                 lw->selected--;
 119         else if (options.list_wrap)
 120                 lw->selected = length - 1;
 121 }
 122
 123 static void
 124 list_window_first(struct list_window *lw)
 125 {
 126         lw->xoffset = 0;
 127         lw->selected = 0;
 128 }
 129
 130 static void
 131 list_window_last(struct list_window *lw, unsigned length)
 132 {
 133         lw->xoffset = 0;
 134         if (length > 0)
 135                 lw->selected = length - 1;
 136         else
 137                 lw->selected = 0;
 138 }
 139
 140 static void
 141 list_window_next_page(struct list_window *lw, unsigned length)
 142 {
 143         if (lw->rows < 2)
 144                 return;
 145         if (lw->selected + lw->rows < length)
 146                 lw->selected += lw->rows - 1;
 147         else
 148                 list_window_last(lw, length);
 149 }
 150
 151 static void
 152 list_window_previous_page(struct list_window *lw)
 153 {
 154         if (lw->rows < 2)
 155                 return;
 156         if (lw->selected > lw->rows - 1)
 157                 lw->selected -= lw->rows - 1;
 158         else
 159                 list_window_first(lw);
 160 }
 161
 162
 163 void
 164 list_window_paint(struct list_window *lw,
 165                   list_window_callback_fn_t callback,
 166                   void *callback_data)
 167 {
 168         unsigned i;
 169         bool fill = options.wide_cursor;
 170         bool show_cursor = !lw->hide_cursor;
 171
 172         if (show_cursor) {
 173                 if (lw->selected < lw->start)
 174                         lw->start = lw->selected;
 175
 176                 if (lw->selected >= lw->start + lw->rows)
 177                         lw->start = lw->selected - lw->rows + 1;
 178         }
 179
 180         for (i = 0; i < lw->rows; i++) {
 181                 bool highlight = false;
 182                 const char *label;
 183
 184                 label = callback(lw->start + i, &highlight, callback_data);
 185                 wmove(lw->w, i, 0);
 186
 187                 if (label) {
 188                         bool selected = lw->start + i == lw->selected;
 189                         unsigned len = utf8_width(label);
 190
 191                         if (highlight)
 192                                 colors_use(lw->w, COLOR_LIST_BOLD);
 193                         else
 194                                 colors_use(lw->w, COLOR_LIST);
 195
 196                         if (show_cursor && selected)
 197                                 wattron(lw->w, A_REVERSE);
 198
 199                         //waddnstr(lw->w, label, lw->cols);
 200                         waddstr(lw->w, label);
 201                         if (fill && len < lw->cols)
 202                                 whline(lw->w,  ' ', lw->cols-len);
 203
 204                         if (selected)
 205                                 wattroff(lw->w, A_REVERSE);
 206
 207                         if (!fill && len < lw->cols)
 208                                 wclrtoeol(lw->w);
 209                 } else
 210                         wclrtoeol(lw->w);
 211         }
 212 }
 213
 214 bool
 215 list_window_find(struct list_window *lw,
 216                  list_window_callback_fn_t callback,
 217                  void *callback_data,
 218                  const char *str,
 219                  bool wrap)
 220 {
 221         bool h;
 222         unsigned i = lw->selected + 1;
 223         const char *label;
 224
 225         do {
 226                 while ((label = callback(i,&h,callback_data))) {
 227                         if (str && label && match_line(label, str)) {
 228                                 lw->selected = i;
 229                                 return true;
 230                         }
 231                         if (wrap && i == lw->selected)
 232                                 return false;
 233                         i++;
 234                 }
 235                 if (wrap) {
 236                         if (i == 0) /* empty list */
 237                                 return 1;
 238                         i=0; /* first item */
 239                         screen_bell();
 240                 }
 241         } while (wrap);
 242
 243         return false;
 244 }
 245
 246 bool
 247 list_window_rfind(struct list_window *lw,
 248                   list_window_callback_fn_t callback,
 249                   void *callback_data,
 250                   const char *str,
 251                   bool wrap,
 252                   unsigned rows)
 253 {
 254         bool h;
 255         int i = lw->selected - 1;
 256         const char *label;
 257
 258         if (rows == 0)
 259                 return false;
 260
 261         do {
 262                 while (i >= 0 && (label = callback(i,&h,callback_data))) {
 263                         if( str && label && match_line(label, str) ) {
 264                                 lw->selected = i;
 265                                 return true;
 266                         }
 267                         if (wrap && i == (int)lw->selected)
 268                                 return false;
 269                         i--;
 270                 }
 271                 if (wrap) {
 272                         i = rows - 1; /* last item */
 273                         screen_bell();
 274                 }
 275         } while (wrap);
 276
 277         return false;
 278 }
 279
 280 /* perform basic list window commands (movement) */
 281 bool
 282 list_window_cmd(struct list_window *lw, unsigned rows, command_t cmd)
 283 {
 284         switch (cmd) {
 285         case CMD_LIST_PREVIOUS:
 286                 list_window_previous(lw, rows);
 287                 break;
 288         case CMD_LIST_NEXT:
 289                 list_window_next(lw, rows);
 290                 break;
 291         case CMD_LIST_FIRST:
 292                 list_window_first(lw);
 293                 break;
 294         case CMD_LIST_LAST:
 295                 list_window_last(lw, rows);
 296                 break;
 297         case CMD_LIST_NEXT_PAGE:
 298                 list_window_next_page(lw, rows);
 299                 break;
 300         case CMD_LIST_PREVIOUS_PAGE:
 301                 list_window_previous_page(lw);
 302                 break;
 303         default:
 304                 return false;
 305         }
 306
 307         return true;
 308 }
 309
 310 bool
 311 list_window_scroll_cmd(struct list_window *lw, unsigned rows, command_t cmd)
 312 {
 313         switch (cmd) {
 314         case CMD_LIST_PREVIOUS:
 315                 if (lw->start > 0)
 316                         lw->start--;
 317                 break;
 318
 319         case CMD_LIST_NEXT:
 320                 if (lw->start + lw->rows < rows)
 321                         lw->start++;
 322                 break;
 323
 324         case CMD_LIST_FIRST:
 325                 lw->start = 0;
 326                 break;
 327
 328         case CMD_LIST_LAST:
 329                 if (rows > lw->rows)
 330                         lw->start = rows - lw->rows;
 331                 else
 332                         lw->start = 0;
 333                 break;
 334
 335         case CMD_LIST_NEXT_PAGE:
 336                 lw->start += lw->rows - 1;
 337                 if (lw->start + lw->rows > rows) {
 338                         if (rows > lw->rows)
 339                                 lw->start = rows - lw->rows;
 340                         else
 341                                 lw->start = 0;
 342                 }
 343                 break;
 344
 345         case CMD_LIST_PREVIOUS_PAGE:
 346                 if (lw->start > lw->rows)
 347                         lw->start -= lw->rows;
 348                 else
 349                         lw->start = 0;
 350                 break;
 351
 352         default:
 353                 return false;
 354         }
 355
 356         return true;
 357 }
 358
 359 #ifdef HAVE_GETMOUSE
 360 bool
 361 list_window_mouse(struct list_window *lw, unsigned rows,
 362                   unsigned long bstate, int y)
 363 {
 364         assert(lw != NULL);
 365
 366         /* if the even occured above the list window move up */
 367         if (y < 0) {
 368                 if (bstate & BUTTON3_CLICKED)
 369                         list_window_first(lw);
 370                 else
 371                         list_window_previous_page(lw);
 372                 return true;
 373         }
 374
 375         /* if the even occured below the list window move down */
 376         if ((unsigned)y >= rows) {
 377                 if (bstate & BUTTON3_CLICKED)
 378                         list_window_last(lw, rows);
 379                 else
 380                         list_window_next_page(lw, rows);
 381                 return true;
 382         }
 383
 384         return false;
 385 }
 386 #endif