rockbox/apps/plugins/text_viewer/tv_action.c
Thomas Martitz abdc5935be Introduce plugin_crt0.c that every plugin links.
It handles exit() properly, calling the handler also when the plugin returns
normally (also it makes exit() more standard compliant while at it).
It also holds PLUGIN_HEADER, so that it doesn't need to be in each plugin anymore.

To work better together with callbacks passed to rb->default_event_handler_ex introduce exit_on_usb() which will call the exit handler before showing the usb screen and exit() after it.
In most cases it was passed a callback which was manually called at all other return points. This can now be done via atexit().

In future plugin_crt0.c could also handle clearing bss, initializing iram and more.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@27862 a1c6a512-1295-4272-9138-f99709370657
2010-08-23 16:56:49 +00:00

191 lines
4.8 KiB
C

/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 Gilles Roux
* 2003 Garrett Derner
* 2010 Yoshihisa Uchida
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "plugin.h"
#include "tv_action.h"
#include "tv_bookmark.h"
#include "tv_pager.h"
#include "tv_screen_pos.h"
#include "tv_settings.h"
#include "tv_window.h"
bool tv_init_action(unsigned char **buf, size_t *size)
{
/* initialize bookmarks and window modules */
return tv_init_bookmark(buf, size) && tv_init_window(buf, size);
}
static void tv_finalize_action(void)
{
/* save preference and bookmarks */
if (!tv_save_settings())
rb->splash(HZ, "Can't save preferences and bookmarks");
/* finalize bookmark modules */
tv_finalize_bookmark();
/* finalize window modules */
tv_finalize_window();
}
void tv_exit(void)
{
/* save preference and bookmarks */
if (!tv_save_settings())
rb->splash(HZ, "Can't save preferences and bookmarks");
/* finalize modules */
tv_finalize_action();
}
bool tv_load_file(const unsigned char *file)
{
/* load the preferences and bookmark */
if (!tv_load_settings(file))
return false;
/* select to read the page */
tv_select_bookmark();
return true;
}
void tv_draw(void)
{
struct tv_screen_pos pos;
tv_copy_screen_pos(&pos);
tv_draw_window();
if (pos.line == 0)
tv_new_page();
tv_move_screen(pos.page, pos.line, SEEK_SET);
}
void tv_scroll_up(unsigned mode)
{
int offset_page = 0;
int offset_line = -1;
if ((mode == TV_VERTICAL_SCROLL_PAGE) ||
(mode == TV_VERTICAL_SCROLL_PREFS && preferences->vertical_scroll_mode == VS_PAGE))
{
offset_page--;
#ifdef HAVE_LCD_BITMAP
offset_line = (preferences->overlap_page_mode)? 1:0;
#endif
}
tv_move_screen(offset_page, offset_line, SEEK_CUR);
}
void tv_scroll_down(unsigned mode)
{
int offset_page = 0;
int offset_line = 1;
if ((mode == TV_VERTICAL_SCROLL_PAGE) ||
(mode == TV_VERTICAL_SCROLL_PREFS && preferences->vertical_scroll_mode == VS_PAGE))
{
offset_page++;
#ifdef HAVE_LCD_BITMAP
offset_line = (preferences->overlap_page_mode)? -1:0;
#endif
}
tv_move_screen(offset_page, offset_line, SEEK_CUR);
}
void tv_scroll_left(unsigned mode)
{
int offset_window = 0;
int offset_column = 0;
if ((mode == TV_HORIZONTAL_SCROLL_COLUMN) ||
(mode == TV_HORIZONTAL_SCROLL_PREFS && preferences->horizontal_scroll_mode == HS_COLUMN))
{
/* Scroll left one column */
offset_column--;
}
else
{
/* Scroll left one window */
offset_window--;
}
tv_move_window(offset_window, offset_column);
}
void tv_scroll_right(unsigned mode)
{
int offset_window = 0;
int offset_column = 0;
if ((mode == TV_HORIZONTAL_SCROLL_COLUMN) ||
(mode == TV_HORIZONTAL_SCROLL_PREFS && preferences->horizontal_scroll_mode == HS_COLUMN))
{
/* Scroll right one column */
offset_column++;
}
else
{
/* Scroll right one window */
offset_window++;
}
tv_move_window(offset_window, offset_column);
}
void tv_top(void)
{
tv_move_screen(0, 0, SEEK_SET);
}
void tv_bottom(void)
{
tv_move_screen(0, 0, SEEK_END);
if (preferences->vertical_scroll_mode == VS_PAGE)
tv_move_screen(0, -tv_get_screen_pos()->line, SEEK_CUR);
}
unsigned tv_menu(void)
{
unsigned res;
struct tv_screen_pos cur_pos;
off_t cur_file_pos = tv_get_screen_pos()->file_pos;
res = tv_display_menu();
if (res == TV_MENU_RESULT_EXIT_MENU)
{
tv_convert_fpos(cur_file_pos, &cur_pos);
if (preferences->vertical_scroll_mode == VS_PAGE)
cur_pos.line = 0;
tv_move_screen(cur_pos.page, cur_pos.line, SEEK_SET);
}
else if (res == TV_MENU_RESULT_MOVE_PAGE)
res = TV_MENU_RESULT_EXIT_MENU;
return res;
}
void tv_add_or_remove_bookmark(void)
{
tv_toggle_bookmark();
}