apps/plugins/text_viewer/tv_window.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_bookmark.h"
  25 #include "tv_display.h"
  26 #include "tv_preferences.h"
  27 #include "tv_screen_pos.h"
  28 #include "tv_text_reader.h"
  29 #include "tv_window.h"
  30
  31 static int window_width;
  32 static int window_columns;
  33 static int display_lines;
  34 static int col_width;
  35
  36 static int cur_window;
  37 static int cur_column;
  38
  39 #ifdef HAVE_LCD_BITMAP
  40 static bool tv_set_font(const unsigned char *font)
  41 {
  42     unsigned char path[MAX_PATH];
  43
  44     if (font != NULL && *font != '\0')
  45     {
  46         rb->snprintf(path, MAX_PATH, "%s/%s.fnt", FONT_DIR, font);
  47         if (rb->font_load(NULL, path) < 0)
  48         {
  49             rb->splash(HZ/2, "font load failed");
  50             return false;
  51         }
  52     }
  53     return true;
  54 }
  55 #endif
  56
  57 static void tv_draw_bookmarks(const struct tv_screen_pos *top_pos)
  58 {
  59     struct tv_screen_pos bookmarks[TV_MAX_BOOKMARKS];
  60     int disp_bookmarks[TV_MAX_BOOKMARKS];
  61     int count = tv_get_bookmark_positions(bookmarks);
  62     int disp_count = 0;
  63     int line;
  64
  65     while (count--)
  66     {
  67         line = (bookmarks[count].page - top_pos->page) * display_lines
  68                                       + (bookmarks[count].line - top_pos->line);
  69         if (line >= 0 && line < display_lines)
  70             disp_bookmarks[disp_count++] = line;
  71     }
  72
  73     tv_show_bookmarks(disp_bookmarks, disp_count);
  74 }
  75
  76 void tv_draw_window(void)
  77 {
  78     struct tv_screen_pos pos;
  79     const unsigned char *text_buf;
  80     int line;
  81     int size = 0;
  82
  83     tv_copy_screen_pos(&pos);
  84
  85     tv_start_display();
  86
  87     tv_read_start(cur_window, (cur_column > 0));
  88
  89     for (line = 0; line < display_lines; line++)
  90     {
  91         if (!tv_get_next_line(&text_buf))
  92             break;
  93
  94         tv_draw_text(line, text_buf, cur_column);
  95     }
  96
  97     size = tv_read_end();
  98
  99 #ifdef HAVE_LCD_BITMAP
 100     tv_show_scrollbar(cur_window, cur_column, pos.file_pos, size);
 101     tv_show_header();
 102     tv_show_footer(&pos);
 103 #endif
 104     tv_draw_bookmarks(&pos);
 105
 106     tv_update_display();
 107     tv_end_display();
 108 }
 109
 110 bool tv_traverse_lines(void)
 111 {
 112     int i;
 113     bool res = true;
 114
 115     tv_read_start(0, false);
 116     for (i = 0; i < display_lines; i++)
 117     {
 118         if (!tv_get_next_line(NULL))
 119         {
 120             res = false;
 121             break;
 122         }
 123     }
 124     tv_read_end();
 125     return res;
 126 }
 127
 128 static void tv_change_preferences(const struct tv_preferences *oldp)
 129 {
 130 #ifndef HAVE_LCD_BITMAP
 131     (void)oldp;
 132 #else
 133     static bool font_changing = false;
 134     const unsigned char *font_str;
 135     bool need_vertical_scrollbar;
 136     struct tv_preferences new_prefs;
 137     tv_copy_preferences(&new_prefs);
 138
 139     font_str = (oldp && !font_changing)? oldp->font_name : rb->global_settings->font_file;
 140
 141     /* change font */
 142     if (font_changing || rb->strcmp(font_str, preferences->font_name))
 143     {
 144         font_changing = true;
 145         if (!tv_set_font(preferences->font_name))
 146         {
 147             rb->strlcpy(new_prefs.font_name, font_str, MAX_PATH);
 148             tv_set_preferences(&new_prefs);
 149             return;
 150         }
 151     }
 152
 153     font_changing = false;
 154 #endif
 155
 156 #ifdef HAVE_LCD_BITMAP
 157     col_width = 2 * rb->font_get_width(preferences->font, ' ');
 158 #else
 159     col_width = 1;
 160 #endif
 161
 162     if (cur_window >= preferences->windows)
 163         cur_window = 0;
 164
 165     /* change viewport */
 166     tv_change_viewport();
 167
 168 #ifdef HAVE_LCD_BITMAP
 169     need_vertical_scrollbar = false;
 170     tv_set_layout(col_width, need_vertical_scrollbar);
 171     tv_get_drawarea_info(&window_width, &window_columns, &display_lines);
 172     tv_seek_top();
 173     tv_set_read_conditions(preferences->windows, window_width);
 174     if (tv_traverse_lines() && preferences->vertical_scrollbar)
 175     {
 176         need_vertical_scrollbar = true;
 177         tv_set_layout(col_width, need_vertical_scrollbar);
 178         tv_get_drawarea_info(&window_width, &window_columns, &display_lines);
 179     }
 180     tv_seek_top();
 181 #else
 182     tv_set_layout(col_width);
 183     tv_get_drawarea_info(&window_width, &window_columns, &display_lines);
 184 #endif
 185
 186     window_columns = window_width / col_width;
 187     cur_column = 0;
 188
 189     tv_set_read_conditions(preferences->windows, window_width);
 190
 191     tv_init_display();
 192 #ifdef HAVE_LCD_BITMAP
 193     tv_init_scrollbar(tv_get_total_text_size(), need_vertical_scrollbar);
 194 #endif
 195 }
 196
 197 bool tv_init_window(unsigned char **buf, size_t *size)
 198 {
 199     tv_add_preferences_change_listner(tv_change_preferences);
 200     return tv_init_text_reader(buf, size);
 201 }
 202
 203 void tv_finalize_window(void)
 204 {
 205     tv_finalize_text_reader();
 206
 207 #ifdef HAVE_LCD_BITMAP
 208     /* restore font */
 209     if (rb->strcmp(rb->global_settings->font_file, preferences->font_name))
 210     {
 211         tv_set_font(rb->global_settings->font_file);
 212     }
 213
 214     /* undo viewport */
 215     tv_undo_viewport();
 216 #endif
 217 }
 218
 219 void tv_move_window(int window_delta, int column_delta)
 220 {
 221     cur_window += window_delta;
 222     cur_column += column_delta;
 223
 224     if (cur_window < 0)
 225     {
 226         cur_window = 0;
 227         cur_column = 0;
 228     }
 229     else if (cur_window >= preferences->windows)
 230     {
 231         cur_window = preferences->windows - 1;
 232         cur_column = 0;
 233     }
 234
 235     if (cur_column < 0)
 236     {
 237         if (cur_window == 0)
 238             cur_column = 0;
 239         else
 240         {
 241             cur_window--;
 242             cur_column = window_columns - 1;
 243         }
 244     }
 245     else
 246     {
 247         if (cur_window == preferences->windows - 1)
 248             cur_column = 0;
 249         else if (cur_column >= window_columns)
 250         {
 251             cur_window++;
 252             cur_column = 0;
 253         }
 254     }
 255 }