apps/plugins/text_viewer/tv_preferences.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2002 Gilles Roux
  11  *               2003 Garrett Derner
  12  *               2010 Yoshihisa Uchida
  13  *
  14  * This program is free software; you can redistribute it and/or
  15  * modify it under the terms of the GNU General Public License
  16  * as published by the Free Software Foundation; either version 2
  17  * of the License, or (at your option) any later version.
  18  *
  19  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  20  * KIND, either express or implied.
  21  *
  22  ****************************************************************************/
  23 #include "plugin.h"
  24 #include "tv_preferences.h"
  25
  26
  27 static struct tv_preferences prefs;
  28 /* read-only preferences pointer, for access by other files */
  29 const struct tv_preferences * const preferences = &prefs;
  30
  31 bool preferences_changed = false;
  32
  33 static int listner_count = 0;
  34
  35 #define TV_MAX_LISTNERS 5
  36 static int (*listners[TV_MAX_LISTNERS])(const struct tv_preferences *oldp);
  37
  38 static bool tv_notify_change_preferences(const struct tv_preferences *oldp)
  39 {
  40     int i;
  41     int res = TV_CALLBACK_OK;
  42
  43     /*
  44      * the following items do not check.
  45      *   - alignment
  46      *   - horizontal_scroll_mode
  47      *   - vertical_scroll_mode
  48      *   - overlap_page_mode
  49      *   - font
  50      *   - autoscroll_speed
  51      *   - narrow_mode
  52      */
  53     if ((oldp == NULL)                                                    ||
  54         (oldp->word_mode            != preferences->word_mode)            ||
  55         (oldp->line_mode            != preferences->line_mode)            ||
  56         (oldp->windows              != preferences->windows)              ||
  57         (oldp->horizontal_scrollbar != preferences->horizontal_scrollbar) ||
  58         (oldp->vertical_scrollbar   != preferences->vertical_scrollbar)   ||
  59         (oldp->encoding             != preferences->encoding)             ||
  60         (oldp->indent_spaces        != preferences->indent_spaces)        ||
  61 #ifdef HAVE_LCD_BITMAP
  62         (oldp->header_mode          != preferences->header_mode)          ||
  63         (oldp->footer_mode          != preferences->footer_mode)          ||
  64         (oldp->statusbar            != preferences->statusbar)            ||
  65         (rb->strcmp(oldp->font_name, preferences->font_name))             ||
  66 #endif
  67         (rb->strcmp(oldp->file_name, preferences->file_name)))
  68     {
  69         /* callback functions are called as FILO */
  70         for (i = listner_count - 1; i >= 0; i--)
  71             if ((res = listners[i](oldp)) != TV_CALLBACK_OK)
  72                 break;
  73     }
  74     return (res != TV_CALLBACK_ERROR);
  75 }
  76
  77 bool tv_set_preferences(const struct tv_preferences *new_prefs)
  78 {
  79     static struct tv_preferences old_prefs;
  80     struct tv_preferences *oldp = NULL;
  81     static bool is_initialized = false;
  82
  83     if (is_initialized)
  84         tv_copy_preferences((oldp = &old_prefs));
  85     is_initialized = true;
  86
  87     rb->memcpy(&prefs, new_prefs, sizeof(struct tv_preferences));
  88     return tv_notify_change_preferences(oldp);
  89 }
  90
  91 void tv_copy_preferences(struct tv_preferences *copy_prefs)
  92 {
  93     rb->memcpy(copy_prefs, preferences, sizeof(struct tv_preferences));
  94 }
  95
  96 bool tv_compare_preferences(struct tv_preferences *copy_prefs)
  97 {
  98     return rb->memcmp(copy_prefs, preferences, sizeof(struct tv_preferences)) != 0;
  99 }
 100
 101 void tv_set_default_preferences(struct tv_preferences *p)
 102 {
 103     p->word_mode = WM_WRAP;
 104     p->line_mode = LM_NORMAL;
 105     p->windows = 1;
 106     p->alignment = AL_LEFT;
 107     p->horizontal_scroll_mode = HS_SCREEN;
 108     p->vertical_scroll_mode = VS_PAGE;
 109     p->overlap_page_mode = false;
 110     p->horizontal_scrollbar = false;
 111     p->vertical_scrollbar = false;
 112 #ifdef HAVE_LCD_BITMAP
 113     p->header_mode = true;
 114     p->footer_mode = true;
 115     p->statusbar   = true;
 116     rb->strlcpy(p->font_name, rb->global_settings->font_file, MAX_PATH);
 117     p->font = rb->font_get(FONT_UI);
 118 #else
 119     p->header_mode = false;
 120     p->footer_mode = false;
 121     p->statusbar   = false;
 122 #endif
 123     p->autoscroll_speed = 1;
 124     p->narrow_mode = NM_PAGE;
 125     p->indent_spaces = 2;
 126     /* Set codepage to system default */
 127     p->encoding = rb->global_settings->default_codepage;
 128     p->file_name[0] = '\0';
 129 }
 130
 131 void tv_add_preferences_change_listner(int (*listner)(const struct tv_preferences *oldp))
 132 {
 133     if (listner_count < TV_MAX_LISTNERS)
 134         listners[listner_count++] = listner;
 135 }