apps/gui/list.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2005 by Kevin Ferrare
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21
  22 #include "config.h"
  23 #include "lcd.h"
  24 #include "font.h"
  25 #include "button.h"
  26 #include "sprintf.h"
  27 #include "string.h"
  28 #include "settings.h"
  29 #include "kernel.h"
  30 #include "system.h"
  31
  32 #include "action.h"
  33 #include "screen_access.h"
  34 #include "list.h"
  35 #include "scrollbar.h"
  36 #include "lang.h"
  37 #include "sound.h"
  38 #include "misc.h"
  39 #include "talk.h"
  40 #include "viewport.h"
  41 #include "appevents.h"
  42 #include "statusbar-skinned.h"
  43
  44 /* The minimum number of pending button events in queue before starting
  45  * to limit list drawing interval.
  46  */
  47 #define FRAMEDROP_TRIGGER 6
  48
  49 #ifdef HAVE_LCD_BITMAP
  50 static int offset_step = 16; /* pixels per screen scroll step */
  51 /* should lines scroll out of the screen */
  52 static bool offset_out_of_view = false;
  53 #endif
  54
  55 static void gui_list_select_at_offset(struct gui_synclist * gui_list,
  56                                       int offset);
  57 void list_draw(struct screen *display, struct gui_synclist *list);
  58
  59 #ifdef HAVE_LCD_BITMAP
  60 static int list_need_reinit = false;
  61 static struct viewport parent[NB_SCREENS];
  62
  63 static void list_force_reinit(void *param)
  64 {
  65     (void)param;
  66     list_need_reinit = true;
  67 }
  68
  69 void list_init(void)
  70 {
  71     add_event(GUI_EVENT_THEME_CHANGED, false, list_force_reinit);
  72 }
  73
  74 static void list_init_viewports(struct gui_synclist *list)
  75 {
  76     int i, parent_used;
  77
  78     if (!list)
  79         return;
  80
  81     parent_used = (*list->parent != &parent[SCREEN_MAIN]);
  82
  83     if (!parent_used)
  84     {
  85         FOR_NB_SCREENS(i)
  86         {
  87             list->parent[i] = &parent[i];
  88             viewport_set_defaults(&parent[i], i);
  89 #ifdef HAVE_BUTTONBAR
  90             if (screens[i].has_buttonbar)
  91                 list->parent[i]->height -= BUTTONBAR_HEIGHT;
  92 #endif
  93         }
  94     }
  95     list_need_reinit = false;
  96 }
  97 #else
  98 static struct viewport parent[NB_SCREENS] =
  99 {
 100     [SCREEN_MAIN] =
 101     {
 102         .x        = 0,
 103         .y        = 0,
 104         .width    = LCD_WIDTH,
 105         .height   = LCD_HEIGHT
 106     },
 107 };
 108
 109 #define list_init_viewports(a)
 110 #endif
 111
 112 #ifdef HAVE_LCD_BITMAP
 113 bool list_display_title(struct gui_synclist *list, enum screen_type screen)
 114 {
 115     return list->title != NULL &&
 116         !sb_set_title_text(list->title, list->title_icon, screen) &&
 117         viewport_get_nb_lines(list->parent[screen]) > 2;
 118 }
 119
 120 static int list_get_nb_lines(struct gui_synclist *list, enum screen_type screen)
 121 {
 122     struct viewport vp = *list->parent[screen];
 123     if (list_display_title(list, screen))
 124         vp.height -= font_get(list->parent[screen]->font)->height;
 125     return viewport_get_nb_lines(&vp);
 126 }
 127 #else
 128 #define list_display_title(l, i) false
 129 #define list_get_nb_lines(list, screen) \
 130             viewport_get_nb_lines((list)->parent[(screen)]);
 131 #endif
 132
 133 /*
 134  * Initializes a scrolling list
 135  *  - gui_list : the list structure to initialize
 136  *  - callback_get_item_name : pointer to a function that associates a label
 137  *    to a given item number
 138  *  - data : extra data passed to the list callback
 139  *  - scroll_all :
 140  *  - selected_size :
 141  *  - parent : the parent viewports to use. NULL means the full screen minus
 142  *             statusbar if enabled. NOTE: new screens should NOT set this to NULL.
 143  */
 144 void gui_synclist_init(struct gui_synclist * gui_list,
 145     list_get_name callback_get_item_name,
 146     void * data,
 147     bool scroll_all,
 148     int selected_size, struct viewport list_parent[NB_SCREENS]
 149     )
 150 {
 151     int i;
 152     gui_list->callback_get_item_icon = NULL;
 153     gui_list->callback_get_item_name = callback_get_item_name;
 154     gui_list->callback_speak_item = NULL;
 155     gui_list->nb_items = 0;
 156     gui_list->selected_item = 0;
 157     FOR_NB_SCREENS(i)
 158     {
 159         gui_list->start_item[i] = 0;
 160 #ifdef HAVE_LCD_BITMAP
 161         gui_list->offset_position[i] = 0;
 162 #endif
 163         if (list_parent)
 164             gui_list->parent[i] = &list_parent[i];
 165         else
 166             gui_list->parent[i] = &parent[i];
 167     }
 168     list_init_viewports(gui_list);
 169     gui_list->limit_scroll = false;
 170     gui_list->data = data;
 171     gui_list->scroll_all = scroll_all;
 172     gui_list->selected_size = selected_size;
 173     gui_list->title = NULL;
 174     gui_list->title_icon = Icon_NOICON;
 175
 176     gui_list->scheduled_talk_tick = gui_list->last_talked_tick = 0;
 177     gui_list->show_selection_marker = true;
 178
 179 #ifdef HAVE_LCD_COLOR
 180     gui_list->title_color = -1;
 181     gui_list->callback_get_item_color = NULL;
 182 #endif
 183 }
 184
 185 /* this toggles the selection bar or cursor */
 186 void gui_synclist_hide_selection_marker(struct gui_synclist * lists, bool hide)
 187 {
 188     lists->show_selection_marker = !hide;
 189 }
 190
 191
 192 #ifdef HAVE_LCD_BITMAP
 193 int gui_list_get_item_offset(struct gui_synclist * gui_list,
 194                             int item_width,
 195                             int text_pos,
 196                             struct screen * display,
 197                             struct viewport *vp)
 198 {
 199     int item_offset;
 200
 201     if (offset_out_of_view)
 202     {
 203         item_offset = gui_list->offset_position[display->screen_type];
 204     }
 205     else
 206     {
 207         /* if text is smaller than view */
 208         if (item_width <= vp->width - text_pos)
 209         {
 210             item_offset = 0;
 211         }
 212         /* if text got out of view  */
 213         else if (gui_list->offset_position[display->screen_type] >
 214                     item_width - (vp->width - text_pos))
 215         {
 216             item_offset = item_width - (vp->width - text_pos);
 217         }
 218         else
 219             item_offset = gui_list->offset_position[display->screen_type];
 220     }
 221
 222     return item_offset;
 223 }
 224 #endif
 225
 226 /*
 227  * Force a full screen update.
 228  */
 229 void gui_synclist_draw(struct gui_synclist *gui_list)
 230 {
 231     int i;
 232 #ifdef HAVE_LCD_BITMAP
 233     if (list_need_reinit)
 234     {
 235         list_init_viewports(gui_list);
 236         gui_synclist_select_item(gui_list, gui_list->selected_item);
 237     }
 238 #endif
 239     FOR_NB_SCREENS(i)
 240     {
 241         list_draw(&screens[i], gui_list);
 242     }
 243 }
 244
 245 /* sets up the list so the selection is shown correctly on the screen */
 246 static void gui_list_put_selection_on_screen(struct gui_synclist * gui_list,
 247                                              enum screen_type screen)
 248 {
 249     int nb_lines = list_get_nb_lines(gui_list, screen);
 250     int bottom = MAX(0, gui_list->nb_items - nb_lines);
 251     int new_start_item = gui_list->start_item[screen];
 252     int difference = gui_list->selected_item - gui_list->start_item[screen];
 253 #ifdef HAVE_LCD_CHARCELLS
 254     const int scroll_limit_up   = 0;
 255     const int scroll_limit_down = 1;
 256 #else
 257     const int scroll_limit_up   = (nb_lines < gui_list->selected_size+2 ? 0:1);
 258     const int scroll_limit_down = (scroll_limit_up+gui_list->selected_size);
 259 #endif
 260
 261     if (gui_list->show_selection_marker == false)
 262     {
 263         new_start_item = gui_list->selected_item;
 264     }
 265     else if (gui_list->selected_size >= nb_lines)
 266     {
 267         new_start_item = gui_list->selected_item;
 268     }
 269     else if (global_settings.scroll_paginated)
 270     {
 271         nb_lines -= nb_lines%gui_list->selected_size;
 272         if (difference < 0 || difference >= nb_lines)
 273         {
 274             new_start_item = gui_list->selected_item -
 275                                 (gui_list->selected_item%nb_lines);
 276         }
 277     }
 278     else if (difference <= scroll_limit_up) /* list moved up */
 279     {
 280         new_start_item = gui_list->selected_item - scroll_limit_up;
 281     }
 282     else if (difference > nb_lines - scroll_limit_down) /* list moved down */
 283     {
 284         new_start_item = gui_list->selected_item + scroll_limit_down - nb_lines;
 285     }
 286     if (new_start_item < 0)
 287         gui_list->start_item[screen] = 0;
 288     else if (new_start_item > bottom)
 289         gui_list->start_item[screen] = bottom;
 290     else
 291         gui_list->start_item[screen] = new_start_item;
 292 }
 293
 294 /*
 295  * Selects an item in the list
 296  *  - gui_list : the list structure
 297  *  - item_number : the number of the item which will be selected
 298  */
 299 void gui_synclist_select_item(struct gui_synclist * gui_list, int item_number)
 300 {
 301     int i;
 302     if (item_number >= gui_list->nb_items || item_number < 0)
 303         return;
 304     gui_list->selected_item = item_number;
 305     FOR_NB_SCREENS(i)
 306         gui_list_put_selection_on_screen(gui_list, i);
 307 }
 308
 309 static void gui_list_select_at_offset(struct gui_synclist * gui_list,
 310                                       int offset)
 311 {
 312     int new_selection;
 313     if (gui_list->selected_size > 1)
 314     {
 315         offset *= gui_list->selected_size;
 316     }
 317
 318     new_selection = gui_list->selected_item + offset;
 319
 320     if (new_selection >= gui_list->nb_items)
 321     {
 322         gui_list->selected_item = gui_list->limit_scroll ?
 323             gui_list->nb_items - gui_list->selected_size : 0;
 324     }
 325     else if (new_selection < 0)
 326     {
 327         gui_list->selected_item = gui_list->limit_scroll ?
 328             0 : gui_list->nb_items - gui_list->selected_size;
 329     }
 330     else if (gui_list->show_selection_marker == false)
 331     {
 332         int i, nb_lines, screen_top;
 333         FOR_NB_SCREENS(i)
 334         {
 335             nb_lines = list_get_nb_lines(gui_list, i);
 336             if (offset > 0)
 337             {
 338                 screen_top = MAX(0, gui_list->nb_items - nb_lines);
 339                 gui_list->start_item[i] = MIN(screen_top, gui_list->start_item[i] +
 340                                                 gui_list->selected_size);
 341                 gui_list->selected_item = gui_list->start_item[i];
 342             }
 343             else
 344             {
 345                 gui_list->start_item[i] = MAX(0, gui_list->start_item[i] -
 346                                                     gui_list->selected_size);
 347                 gui_list->selected_item = gui_list->start_item[i] + nb_lines;
 348             }
 349         }
 350         return;
 351     }
 352     else gui_list->selected_item += offset;
 353     gui_synclist_select_item(gui_list, gui_list->selected_item);
 354 }
 355
 356 /*
 357  * Adds an item to the list (the callback will be asked for one more item)
 358  * - gui_list : the list structure
 359  */
 360 void gui_synclist_add_item(struct gui_synclist * gui_list)
 361 {
 362     gui_list->nb_items++;
 363     /* if only one item in the list, select it */
 364     if (gui_list->nb_items == 1)
 365         gui_list->selected_item = 0;
 366 }
 367
 368 /*
 369  * Removes an item to the list (the callback will be asked for one less item)
 370  * - gui_list : the list structure
 371  */
 372 void gui_synclist_del_item(struct gui_synclist * gui_list)
 373 {
 374     if (gui_list->nb_items > 0)
 375     {
 376         if (gui_list->selected_item == gui_list->nb_items-1)
 377             gui_list->selected_item--;
 378         gui_list->nb_items--;
 379         gui_synclist_select_item(gui_list, gui_list->selected_item);
 380     }
 381 }
 382
 383 #ifdef HAVE_LCD_BITMAP
 384 void gui_list_screen_scroll_step(int ofs)
 385 {
 386     offset_step = ofs;
 387 }
 388
 389 void gui_list_screen_scroll_out_of_view(bool enable)
 390 {
 391     offset_out_of_view = enable;
 392 }
 393 #endif /* HAVE_LCD_BITMAP */
 394
 395 /*
 396  * Set the title and title icon of the list. Setting title to NULL disables
 397  * both the title and icon. Use NOICON if there is no icon.
 398  */
 399 void gui_synclist_set_title(struct gui_synclist * gui_list,
 400                             char * title, enum themable_icons icon)
 401 {
 402     gui_list->title = title;
 403     gui_list->title_icon = icon;
 404 #ifdef HAVE_LCD_BITMAP
 405     int i;
 406     FOR_NB_SCREENS(i)
 407         sb_set_title_text(title, icon, i);
 408 #endif
 409     send_event(GUI_EVENT_ACTIONUPDATE, (void*)1);
 410 }
 411
 412 void gui_synclist_set_nb_items(struct gui_synclist * lists, int nb_items)
 413 {
 414 #ifdef HAVE_LCD_BITMAP
 415     int i;
 416 #endif
 417     lists->nb_items = nb_items;
 418 #ifdef HAVE_LCD_BITMAP
 419     FOR_NB_SCREENS(i)
 420     {
 421         lists->offset_position[i] = 0;
 422     }
 423 #endif
 424 }
 425 int gui_synclist_get_nb_items(struct gui_synclist * lists)
 426 {
 427     return lists->nb_items;
 428 }
 429 int  gui_synclist_get_sel_pos(struct gui_synclist * lists)
 430 {
 431     return lists->selected_item;
 432 }
 433 void gui_synclist_set_icon_callback(struct gui_synclist * lists,
 434                                     list_get_icon icon_callback)
 435 {
 436     lists->callback_get_item_icon = icon_callback;
 437 }
 438
 439 void gui_synclist_set_voice_callback(struct gui_synclist * lists,
 440                                      list_speak_item voice_callback)
 441 {
 442     lists->callback_speak_item = voice_callback;
 443 }
 444
 445 #ifdef HAVE_LCD_COLOR
 446 void gui_synclist_set_color_callback(struct gui_synclist * lists,
 447                                      list_get_color color_callback)
 448 {
 449     lists->callback_get_item_color = color_callback;
 450 }
 451 #endif
 452
 453 static void gui_synclist_select_next_page(struct gui_synclist * lists,
 454                                           enum screen_type screen)
 455 {
 456     int nb_lines = list_get_nb_lines(lists, screen);
 457     if (lists->selected_size > 1)
 458         nb_lines = MAX(1, nb_lines/lists->selected_size);
 459     gui_list_select_at_offset(lists, nb_lines);
 460 }
 461
 462 static void gui_synclist_select_previous_page(struct gui_synclist * lists,
 463                                               enum screen_type screen)
 464 {
 465     int nb_lines = list_get_nb_lines(lists, screen);
 466     if (lists->selected_size > 1)
 467         nb_lines = MAX(1, nb_lines/lists->selected_size);
 468     gui_list_select_at_offset(lists, -nb_lines);
 469 }
 470
 471 void gui_synclist_limit_scroll(struct gui_synclist * lists, bool scroll)
 472 {
 473     lists->limit_scroll = scroll;
 474 }
 475
 476 #ifdef HAVE_LCD_BITMAP
 477 /*
 478  * Makes all the item in the list scroll by one step to the right.
 479  * Should stop increasing the value when reaching the widest item value
 480  * in the list.
 481  */
 482 static void gui_synclist_scroll_right(struct gui_synclist * lists)
 483 {
 484     int i;
 485     FOR_NB_SCREENS(i)
 486     {
 487         /* FIXME: This is a fake right boundry limiter. there should be some
 488         * callback function to find the longest item on the list in pixels,
 489         * to stop the list from scrolling past that point */
 490         lists->offset_position[i] += offset_step;
 491         if (lists->offset_position[i] > 1000)
 492             lists->offset_position[i] = 1000;
 493     }
 494 }
 495
 496 /*
 497  * Makes all the item in the list scroll by one step to the left.
 498  * stops at starting position.
 499  */
 500 static void gui_synclist_scroll_left(struct gui_synclist * lists)
 501 {
 502     int i;
 503     FOR_NB_SCREENS(i)
 504     {
 505         lists->offset_position[i] -= offset_step;
 506         if (lists->offset_position[i] < 0)
 507             lists->offset_position[i] = 0;
 508     }
 509 }
 510 #endif /* HAVE_LCD_BITMAP */
 511
 512 static void _gui_synclist_speak_item(struct gui_synclist *lists, bool repeating)
 513 {
 514     list_speak_item *cb = lists->callback_speak_item;
 515     if(cb && gui_synclist_get_nb_items(lists) != 0)
 516     {
 517         int sel = gui_synclist_get_sel_pos(lists);
 518         talk_shutup();
 519         /* If we got a repeating key action, or we have just very
 520            recently started talking, then we want to stay silent for a
 521            while until things settle. Likewise if we already had a
 522            pending scheduled announcement not yet due: we need to
 523            reschedule it. */
 524         if(repeating
 525            || (lists->scheduled_talk_tick
 526                && TIME_BEFORE(current_tick, lists->scheduled_talk_tick))
 527            || (lists->last_talked_tick
 528                && TIME_BEFORE(current_tick, lists->last_talked_tick +HZ/4)))
 529         {
 530             lists->scheduled_talk_tick = current_tick +HZ/4;
 531             return;
 532         } else {
 533             lists->scheduled_talk_tick = 0; /* work done */
 534             cb(sel, lists->data);
 535             lists->last_talked_tick = current_tick;
 536         }
 537     }
 538 }
 539 void gui_synclist_speak_item(struct gui_synclist * lists)
 540 /* The list user should call this to speak the first item on entering
 541    the list, and whenever the list is updated. */
 542 {
 543     if(gui_synclist_get_nb_items(lists) == 0 && global_settings.talk_menu)
 544         talk_id(VOICE_EMPTY_LIST, true);
 545     else _gui_synclist_speak_item(lists, false);
 546 }
 547
 548 bool gui_synclist_do_button(struct gui_synclist * lists,
 549                             int *actionptr, enum list_wrap wrap)
 550 {
 551     int action = *actionptr;
 552 #ifdef HAVE_LCD_BITMAP
 553     static bool scrolling_left = false;
 554 #endif
 555
 556 #ifdef HAVE_WHEEL_ACCELERATION
 557     int next_item_modifier = button_apply_acceleration(get_action_data());
 558 #else
 559     static int next_item_modifier = 1;
 560     static int last_accel_tick = 0;
 561     if (global_settings.list_accel_start_delay)
 562     {
 563         int start_delay = global_settings.list_accel_start_delay * (HZ/2);
 564         int accel_wait = global_settings.list_accel_wait * HZ/2;
 565
 566         if (get_action_statuscode(NULL)&ACTION_REPEAT)
 567         {
 568             if (!last_accel_tick)
 569                 last_accel_tick = current_tick + start_delay;
 570             else if (TIME_AFTER(current_tick, last_accel_tick + accel_wait))
 571             {
 572                 last_accel_tick = current_tick;
 573                 next_item_modifier++;
 574             }
 575         }
 576         else if (last_accel_tick)
 577         {
 578             next_item_modifier = 1;
 579             last_accel_tick = 0;
 580         }
 581     }
 582 #endif
 583
 584 #if defined(HAVE_TOUCHSCREEN)
 585     if (action == ACTION_TOUCHSCREEN)
 586         action = *actionptr = gui_synclist_do_touchscreen(lists);
 587 #endif
 588
 589     switch (wrap)
 590     {
 591         case LIST_WRAP_ON:
 592             gui_synclist_limit_scroll(lists, false);
 593         break;
 594         case LIST_WRAP_OFF:
 595             gui_synclist_limit_scroll(lists, true);
 596         break;
 597         case LIST_WRAP_UNLESS_HELD:
 598             if (action == ACTION_STD_PREVREPEAT ||
 599                 action == ACTION_STD_NEXTREPEAT ||
 600                 action == ACTION_LISTTREE_PGUP  ||
 601                 action == ACTION_LISTTREE_PGDOWN)
 602                 gui_synclist_limit_scroll(lists, true);
 603             else gui_synclist_limit_scroll(lists, false);
 604         break;
 605     };
 606
 607     switch (action)
 608     {
 609         case ACTION_REDRAW:
 610             gui_synclist_draw(lists);
 611             return true;
 612
 613 #ifdef HAVE_VOLUME_IN_LIST
 614         case ACTION_LIST_VOLUP:
 615             global_settings.volume += 2;
 616             /* up two because the falthrough brings it down one */
 617         case ACTION_LIST_VOLDOWN:
 618             global_settings.volume--;
 619             setvol();
 620             return true;
 621 #endif
 622         case ACTION_STD_PREV:
 623         case ACTION_STD_PREVREPEAT:
 624             gui_list_select_at_offset(lists, -next_item_modifier);
 625 #ifndef HAVE_WHEEL_ACCELERATION
 626             if (button_queue_count() < FRAMEDROP_TRIGGER)
 627 #endif
 628                 gui_synclist_draw(lists);
 629             _gui_synclist_speak_item(lists,
 630                                      action == ACTION_STD_PREVREPEAT
 631                                      || next_item_modifier > 1);
 632             yield();
 633             *actionptr = ACTION_STD_PREV;
 634             return true;
 635
 636         case ACTION_STD_NEXT:
 637         case ACTION_STD_NEXTREPEAT:
 638             gui_list_select_at_offset(lists, next_item_modifier);
 639 #ifndef HAVE_WHEEL_ACCELERATION
 640             if (button_queue_count() < FRAMEDROP_TRIGGER)
 641 #endif
 642                 gui_synclist_draw(lists);
 643             _gui_synclist_speak_item(lists,
 644                                      action == ACTION_STD_NEXTREPEAT
 645                                      || next_item_modifier >1);
 646             yield();
 647             *actionptr = ACTION_STD_NEXT;
 648             return true;
 649
 650 #ifdef HAVE_LCD_BITMAP
 651         case ACTION_TREE_PGRIGHT:
 652             gui_synclist_scroll_right(lists);
 653             gui_synclist_draw(lists);
 654             return true;
 655         case ACTION_TREE_ROOT_INIT:
 656          /* After this button press ACTION_TREE_PGLEFT is allowed
 657             to skip to root. ACTION_TREE_ROOT_INIT must be defined in the
 658             keymaps as a repeated button press (the same as the repeated
 659             ACTION_TREE_PGLEFT) with the pre condition being the non-repeated
 660             button press */
 661             if (lists->offset_position[0] == 0)
 662             {
 663                 scrolling_left = false;
 664                 *actionptr = ACTION_STD_CANCEL;
 665                 return true;
 666             }
 667             *actionptr = ACTION_TREE_PGLEFT;
 668         case ACTION_TREE_PGLEFT:
 669             if(!scrolling_left && (lists->offset_position[0] == 0))
 670             {
 671                 *actionptr = ACTION_STD_CANCEL;
 672                 return false;
 673             }
 674             gui_synclist_scroll_left(lists);
 675             gui_synclist_draw(lists);
 676             scrolling_left = true; /* stop ACTION_TREE_PAGE_LEFT
 677                                       skipping to root */
 678             return true;
 679 #endif
 680 /* for pgup / pgdown, we are obliged to have a different behaviour depending
 681  * on the screen for which the user pressed the key since for example, remote
 682  * and main screen doesn't have the same number of lines */
 683         case ACTION_LISTTREE_PGUP:
 684         {
 685             int screen =
 686 #ifdef HAVE_REMOTE_LCD
 687                 get_action_statuscode(NULL)&ACTION_REMOTE ?
 688                          SCREEN_REMOTE :
 689 #endif
 690                                           SCREEN_MAIN;
 691             gui_synclist_select_previous_page(lists, screen);
 692             gui_synclist_draw(lists);
 693             _gui_synclist_speak_item(lists, false);
 694             yield();
 695             *actionptr = ACTION_STD_NEXT;
 696         }
 697         return true;
 698
 699         case ACTION_LISTTREE_PGDOWN:
 700         {
 701             int screen =
 702 #ifdef HAVE_REMOTE_LCD
 703                 get_action_statuscode(NULL)&ACTION_REMOTE ?
 704                          SCREEN_REMOTE :
 705 #endif
 706                                           SCREEN_MAIN;
 707             gui_synclist_select_next_page(lists, screen);
 708             gui_synclist_draw(lists);
 709             _gui_synclist_speak_item(lists, false);
 710             yield();
 711             *actionptr = ACTION_STD_PREV;
 712         }
 713         return true;
 714     }
 715     if(lists->scheduled_talk_tick
 716        && TIME_AFTER(current_tick, lists->scheduled_talk_tick))
 717         /* scheduled postponed item announcement is due */
 718         _gui_synclist_speak_item(lists, false);
 719     return false;
 720 }
 721
 722 int list_do_action_timeout(struct gui_synclist *lists, int timeout)
 723 /* Returns the lowest of timeout or the delay until a postponed
 724    scheduled announcement is due (if any). */
 725 {
 726     if(lists->scheduled_talk_tick)
 727     {
 728         long delay = lists->scheduled_talk_tick -current_tick +1;
 729         /* +1 because the trigger condition uses TIME_AFTER(), which
 730            is implemented as strictly greater than. */
 731         if(delay < 0)
 732             delay = 0;
 733         if(timeout > delay || timeout == TIMEOUT_BLOCK)
 734             timeout = delay;
 735     }
 736     return timeout;
 737 }
 738
 739 bool list_do_action(int context, int timeout,
 740                     struct gui_synclist *lists, int *action,
 741                     enum list_wrap wrap)
 742 /* Combines the get_action() (with possibly overridden timeout) and
 743    gui_synclist_do_button() calls. Returns the list action from
 744    do_button, and places the action from get_action in *action. */
 745 {
 746     timeout = list_do_action_timeout(lists, timeout);
 747     *action = get_action(context, timeout);
 748     return gui_synclist_do_button(lists, action, wrap);
 749 }
 750
 751 bool gui_synclist_item_is_onscreen(struct gui_synclist *lists,
 752                                    enum screen_type screen, int item)
 753 {
 754     int nb_lines = list_get_nb_lines(lists, screen);
 755     return (unsigned)(item - lists->start_item[screen]) < (unsigned) nb_lines;
 756 }
 757
 758 /* Simple use list implementation */
 759 static int simplelist_line_count = 0;
 760 static char simplelist_text[SIMPLELIST_MAX_LINES][SIMPLELIST_MAX_LINELENGTH];
 761 /* set the amount of lines shown in the list */
 762 void simplelist_set_line_count(int lines)
 763 {
 764     if (lines < 0)
 765         simplelist_line_count = 0;
 766     else if (lines >= SIMPLELIST_MAX_LINES)
 767         simplelist_line_count = SIMPLELIST_MAX_LINES;
 768     else
 769         simplelist_line_count = lines;
 770 }
 771 /* get the current amount of lines shown */
 772 int simplelist_get_line_count(void)
 773 {
 774     return simplelist_line_count;
 775 }
 776 /* add/edit a line in the list.
 777    if line_number > number of lines shown it adds the line,
 778    else it edits the line */
 779 void simplelist_addline(int line_number, const char *fmt, ...)
 780 {
 781     va_list ap;
 782
 783     if (line_number > simplelist_line_count)
 784     {
 785         if (simplelist_line_count < SIMPLELIST_MAX_LINES)
 786             line_number = simplelist_line_count++;
 787         else
 788             return;
 789     }
 790     va_start(ap, fmt);
 791     vsnprintf(simplelist_text[line_number], SIMPLELIST_MAX_LINELENGTH, fmt, ap);
 792     va_end(ap);
 793 }
 794
 795 static const char* simplelist_static_getname(int item,
 796                                              void * data,
 797                                              char *buffer,
 798                                              size_t buffer_len)
 799 {
 800     (void)data; (void)buffer; (void)buffer_len;
 801     return simplelist_text[item];
 802 }
 803
 804 bool simplelist_show_list(struct simplelist_info *info)
 805 {
 806     struct gui_synclist lists;
 807     int action, old_line_count = simplelist_line_count, i;
 808     const char* (*getname)(int item, void * data, char *buffer, size_t buffer_len);
 809     int wrap = LIST_WRAP_UNLESS_HELD;
 810     if (info->get_name)
 811         getname = info->get_name;
 812     else
 813         getname = simplelist_static_getname;
 814
 815     FOR_NB_SCREENS(i)
 816         viewportmanager_theme_enable(i, true, NULL);
 817
 818     gui_synclist_init(&lists, getname,  info->callback_data,
 819                       info->scroll_all, info->selection_size, NULL);
 820
 821     if (info->title)
 822         gui_synclist_set_title(&lists, info->title, NOICON);
 823     if (info->get_icon)
 824         gui_synclist_set_icon_callback(&lists, info->get_icon);
 825     if (info->get_talk)
 826         gui_synclist_set_voice_callback(&lists, info->get_talk);
 827
 828     if (info->hide_selection)
 829     {
 830         gui_synclist_hide_selection_marker(&lists, true);
 831         wrap = LIST_WRAP_OFF;
 832     }
 833
 834     if (info->action_callback)
 835         info->action_callback(ACTION_REDRAW, &lists);
 836
 837     if (info->get_name == NULL)
 838         gui_synclist_set_nb_items(&lists,
 839                 simplelist_line_count*info->selection_size);
 840     else
 841         gui_synclist_set_nb_items(&lists, info->count*info->selection_size);
 842
 843     gui_synclist_select_item(&lists, info->selection);
 844
 845     gui_synclist_draw(&lists);
 846     gui_synclist_speak_item(&lists);
 847
 848     while(1)
 849     {
 850         list_do_action(CONTEXT_STD, info->timeout,
 851                        &lists, &action, wrap);
 852
 853         /* We must yield in this case or no other thread can run */
 854         if (info->timeout == TIMEOUT_NOBLOCK)
 855             yield();
 856
 857         if (info->action_callback)
 858         {
 859             bool stdok = action==ACTION_STD_OK;
 860             action = info->action_callback(action, &lists);
 861             if (stdok && action == ACTION_STD_CANCEL)
 862             {
 863                 /* callback asked us to exit */
 864                 info->selection = gui_synclist_get_sel_pos(&lists);
 865                 break;
 866             }
 867
 868             if (info->get_name == NULL)
 869                 gui_synclist_set_nb_items(&lists,
 870                         simplelist_line_count*info->selection_size);
 871         }
 872         if (action == ACTION_STD_CANCEL)
 873         {
 874             info->selection = -1;
 875             break;
 876         }
 877         else if ((action == ACTION_REDRAW) ||
 878                  (old_line_count != simplelist_line_count))
 879         {
 880             if (info->get_name == NULL)
 881             {
 882                 gui_synclist_set_nb_items(&lists,
 883                         simplelist_line_count*info->selection_size);
 884             }
 885             gui_synclist_draw(&lists);
 886             old_line_count = simplelist_line_count;
 887         }
 888         else if(default_event_handler(action) == SYS_USB_CONNECTED)
 889             return true;
 890     }
 891     talk_shutup();
 892     FOR_NB_SCREENS(i)
 893         viewportmanager_theme_undo(i, false);
 894     return false;
 895 }
 896
 897 void simplelist_info_init(struct simplelist_info *info, char* title,
 898                           int count, void* data)
 899 {
 900     info->title = title;
 901     info->count = count;
 902     info->selection_size = 1;
 903     info->hide_selection = false;
 904     info->scroll_all = false;
 905     info->timeout = HZ/10;
 906     info->selection = 0;
 907     info->action_callback = NULL;
 908     info->get_icon = NULL;
 909     info->get_name = NULL;
 910     info->get_talk = NULL;
 911     info->callback_data = data;
 912     simplelist_line_count = 0;
 913 }