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rockbox/apps/gui/list.c
Jens Arnold 237d3c4c4b Adaptive button repeat: adapts repeat rate depending on the ability of the application to cope. Avoids afterscroll and similar effects. * Yield while scrolling through lists. 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8738 a1c6a512-1295-4272-9138-f99709370657
2006-02-19 13:34:12 +00:00

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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2005 by Kevin Ferrare
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "config.h"
#include "lcd.h"
#include "font.h"
#include "button.h"
#include "sprintf.h"
#include "settings.h"
#include "kernel.h"
#include "screen_access.h"
#include "list.h"
#include "scrollbar.h"
#include "statusbar.h"
#include "textarea.h"
#ifdef HAVE_LCD_CHARCELLS
#define SCROLL_LIMIT 1
#else
#define SCROLL_LIMIT 2
#endif
#ifdef HAVE_LCD_BITMAP
static int offset_step = 16; /* pixels per screen scroll step */
/* should lines scroll out of the screen */
static bool offset_out_of_view = false;
#endif
void gui_list_init(struct gui_list * gui_list,
list_get_name callback_get_item_name,
void * data
)
{
gui_list->callback_get_item_icon = NULL;
gui_list->callback_get_item_name = callback_get_item_name;
gui_list->display = NULL;
gui_list_set_nb_items(gui_list, 0);
gui_list->selected_item = 0;
gui_list->start_item = 0;
gui_list->limit_scroll = false;
gui_list->data=data;
gui_list->cursor_flash_state=false;
#ifdef HAVE_LCD_BITMAP
gui_list->offset_position = 0;
#endif
}
void gui_list_set_display(struct gui_list * gui_list, struct screen * display)
{
if(gui_list->display != 0) /* we switched from a previous display */
gui_list->display->stop_scroll();
gui_list->display = display;
#ifdef HAVE_LCD_CHARCELLS
display->double_height(false);
#endif
gui_list_put_selection_in_screen(gui_list, false);
}
void gui_list_flash(struct gui_list * gui_list)
{
struct screen * display=gui_list->display;
gui_list->cursor_flash_state=!gui_list->cursor_flash_state;
int selected_line=gui_list->selected_item-gui_list->start_item;
#ifdef HAVE_LCD_BITMAP
int line_ypos=display->getymargin()+display->char_height*selected_line;
if (global_settings.invert_cursor)
{
int line_xpos=display->getxmargin();
display->set_drawmode(DRMODE_COMPLEMENT);
display->fillrect(line_xpos, line_ypos, display->width,
display->char_height);
display->set_drawmode(DRMODE_SOLID);
display->invertscroll(0, selected_line);
}
else
{
int cursor_xpos=(global_settings.scrollbar &&
display->nb_lines < gui_list->nb_items)?1:0;
screen_put_cursorxy(display, cursor_xpos, selected_line, gui_list->cursor_flash_state);
}
display->update_rect(0, line_ypos,display->width,
display->char_height);
#else
screen_put_cursorxy(display, 0, selected_line, gui_list->cursor_flash_state);
gui_textarea_update(display);
#endif
}
void gui_list_put_selection_in_screen(struct gui_list * gui_list,
bool put_from_end)
{
gui_textarea_update_nblines(gui_list->display);
int nb_lines=gui_list->display->nb_lines;
if(put_from_end)
{
int list_end = gui_list->selected_item + SCROLL_LIMIT;
if(list_end-1 == gui_list->nb_items)
list_end--;
if(list_end > gui_list->nb_items)
list_end = nb_lines;
gui_list->start_item = list_end - nb_lines;
}
else
{
int list_start = gui_list->selected_item - SCROLL_LIMIT + 1;
if(list_start + nb_lines > gui_list->nb_items)
list_start = gui_list->nb_items - nb_lines;
gui_list->start_item = list_start;
}
if(gui_list->start_item < 0)
gui_list->start_item = 0;
}
void gui_list_draw(struct gui_list * gui_list)
{
struct screen * display=gui_list->display;
int cursor_pos = 0;
int icon_pos = 1;
int text_pos;
bool draw_icons = (gui_list->callback_get_item_icon != NULL ) ;
bool draw_cursor;
int i;
/* Adjust the position of icon, cursor, text */
#ifdef HAVE_LCD_BITMAP
display->setfont(FONT_UI);
gui_textarea_update_nblines(display);
bool draw_scrollbar = (global_settings.scrollbar &&
display->nb_lines < gui_list->nb_items);
draw_cursor = !global_settings.invert_cursor;
text_pos = 0; /* here it's in pixels */
if(draw_scrollbar)
{
cursor_pos++;
icon_pos++;
text_pos += SCROLLBAR_WIDTH;
}
if(!draw_cursor)
icon_pos--;
else
text_pos += CURSOR_WIDTH;
if(draw_icons)
text_pos += 8;
#else
draw_cursor = true;
if(draw_icons)
text_pos = 2; /* here it's in chars */
else
text_pos = 1;
#endif
gui_textarea_clear(display);
#ifdef HAVE_LCD_BITMAP
screen_set_xmargin(display, text_pos);
#endif
for(i = 0;i < display->nb_lines;i++)
{
char entry_buffer[MAX_PATH];
unsigned char *entry_name;
int current_item = gui_list->start_item + i;
/* When there are less items to display than the
* current available space on the screen, we stop*/
if(current_item >= gui_list->nb_items)
break;
entry_name = gui_list->callback_get_item_name(current_item,
gui_list->data,
entry_buffer);
#ifdef HAVE_LCD_BITMAP
/* position the string at the correct offset place */
int item_offset;
int item_width,h;
display->getstringsize(entry_name, &item_width, &h);
if (offset_out_of_view)
item_offset = gui_list->offset_position;
else
/* if text is smaller then view */
if (item_width <= display->width - text_pos)
item_offset = 0;
else
/* if text got out of view */
if (gui_list->offset_position >
item_width - (display->width - text_pos))
item_offset = item_width - (display->width - text_pos);
else
item_offset = gui_list->offset_position;
#endif
if(current_item == gui_list->selected_item) {
/* The selected item must be displayed scrolling */
#ifdef HAVE_LCD_BITMAP
if (global_settings.invert_cursor)/* Display inverted-line-style*/
/* if text got out of view */
if (item_offset > item_width - (display->width - text_pos))
/* don't scroll */
display->puts_style_offset(0, i, entry_name, STYLE_INVERT,item_offset);
else
display->puts_scroll_style_offset(0, i, entry_name, STYLE_INVERT,item_offset);
else /* if (!global_settings.invert_cursor) */
if (item_offset > item_width - (display->width - text_pos))
display->puts_offset(0, i, entry_name,item_offset);
else
display->puts_scroll_offset(0, i, entry_name,item_offset);
#else
display->puts_scroll(text_pos, i, entry_name);
#endif
if(draw_cursor)
screen_put_cursorxy(display, cursor_pos, i, true);
}
else
{/* normal item */
#ifdef HAVE_LCD_BITMAP
display->puts_offset(0, i, entry_name,item_offset);
#else
display->puts(text_pos, i, entry_name);
#endif
}
/* Icons display */
if(draw_icons)
{
ICON icon;
gui_list->callback_get_item_icon(current_item,
gui_list->data,
&icon);
if(icon)
screen_put_iconxy(display, icon_pos, i, icon);
}
}
#ifdef HAVE_LCD_BITMAP
/* Draw the scrollbar if needed*/
if(draw_scrollbar)
{
int y_start = gui_textarea_get_ystart(display);
int scrollbar_y_end = display->char_height *
display->nb_lines + y_start;
gui_scrollbar_draw(display, 0, y_start, SCROLLBAR_WIDTH-1,
scrollbar_y_end - y_start, gui_list->nb_items,
gui_list->start_item,
gui_list->start_item + display->nb_lines, VERTICAL);
}
#endif
gui_textarea_update(display);
}
void gui_list_select_item(struct gui_list * gui_list, int item_number)
{
if( item_number > gui_list->nb_items-1 || item_number < 0 )
return;
gui_list->selected_item = item_number;
gui_list_put_selection_in_screen(gui_list, false);
}
void gui_list_select_next(struct gui_list * gui_list)
{
int item_pos;
int end_item;
if( gui_list->selected_item == gui_list->nb_items-1 )
{
if(gui_list->limit_scroll)
return;
gui_list->selected_item++;
/* we have already reached the bottom of the list */
gui_list->selected_item = 0;
gui_list->start_item = 0;
}
else
{
int nb_lines = gui_list->display->nb_lines;
gui_list->selected_item++;
item_pos = gui_list->selected_item - gui_list->start_item;
end_item = gui_list->start_item + nb_lines;
if (global_settings.scroll_paginated)
{
/* When we reach the bottom of the list
* we jump to a new page if there are more items*/
if( item_pos > nb_lines-1 && end_item < gui_list->nb_items )
{
gui_list->start_item = gui_list->selected_item;
if ( gui_list->start_item > gui_list->nb_items-nb_lines )
gui_list->start_item = gui_list->nb_items-nb_lines;
}
}
else
{
/* we start scrolling vertically when reaching the line
* (nb_lines-SCROLL_LIMIT)
* and when we are not in the last part of the list*/
if( item_pos > nb_lines-SCROLL_LIMIT && end_item < gui_list->nb_items )
gui_list->start_item++;
}
}
}
void gui_list_select_previous(struct gui_list * gui_list)
{
if( gui_list->selected_item == 0 )
{
int nb_lines = gui_list->display->nb_lines;
if(gui_list->limit_scroll)
return;
gui_list->selected_item--;
/* we have aleady reached the top of the list */
int start;
gui_list->selected_item = gui_list->nb_items-1;
start = gui_list->nb_items-nb_lines;
if( start < 0 )
gui_list->start_item = 0;
else
gui_list->start_item = start;
}
else
{
int item_pos;
int nb_lines = gui_list->display->nb_lines;
gui_list->selected_item--;
item_pos = gui_list->selected_item - gui_list->start_item;
if (global_settings.scroll_paginated)
{
/* When we reach the top of the list
* we jump to a new page if there are more items*/
if( item_pos < 0 && gui_list->start_item > 0 )
gui_list->start_item = gui_list->selected_item-nb_lines+1;
if( gui_list->start_item < 0 )
gui_list->start_item = 0;
}
else
{
/* we start scrolling vertically when reaching the line
* (nb_lines-SCROLL_LIMIT)
* and when we are not in the last part of the list*/
if( item_pos < SCROLL_LIMIT-1 && gui_list->start_item > 0 )
gui_list->start_item--;
}
}
}
void gui_list_select_next_page(struct gui_list * gui_list, int nb_lines)
{
if(gui_list->selected_item == gui_list->nb_items-1)
{
if(gui_list->limit_scroll)
return;
gui_list->selected_item = 0;
}
else
{
gui_list->selected_item += nb_lines;
if(gui_list->selected_item > gui_list->nb_items-1)
gui_list->selected_item = gui_list->nb_items-1;
}
gui_list_put_selection_in_screen(gui_list, true);
}
void gui_list_select_previous_page(struct gui_list * gui_list, int nb_lines)
{
if(gui_list->selected_item == 0)
{
if(gui_list->limit_scroll)
return;
gui_list->selected_item = gui_list->nb_items - 1;
}
else
{
gui_list->selected_item -= nb_lines;
if(gui_list->selected_item < 0)
gui_list->selected_item = 0;
}
gui_list_put_selection_in_screen(gui_list, false);
}
void gui_list_add_item(struct gui_list * gui_list)
{
gui_list->nb_items++;
/* if only one item in the list, select it */
if(gui_list->nb_items == 1)
gui_list->selected_item = 0;
}
void gui_list_del_item(struct gui_list * gui_list)
{
if(gui_list->nb_items > 0)
{
gui_textarea_update_nblines(gui_list->display);
int nb_lines = gui_list->display->nb_lines;
int dist_selected_from_end = gui_list->nb_items
- gui_list->selected_item - 1;
int dist_start_from_end = gui_list->nb_items
- gui_list->start_item - 1;
if(dist_selected_from_end == 0)
{
/* Oops we are removing the selected item,
select the previous one */
gui_list->selected_item--;
}
gui_list->nb_items--;
/* scroll the list if needed */
if( (dist_start_from_end < nb_lines) && (gui_list->start_item != 0) )
gui_list->start_item--;
}
}
#ifdef HAVE_LCD_BITMAP
void gui_list_scroll_right(struct gui_list * gui_list)
{
/* FIXME: This is a fake right boundry limiter. there should be some
* callback function to find the longest item on the list in pixels,
* to stop the list from scrolling past that point */
gui_list->offset_position+=offset_step;
if (gui_list->offset_position > 1000)
gui_list->offset_position = 1000;
}
void gui_list_scroll_left(struct gui_list * gui_list)
{
gui_list->offset_position-=offset_step;
if (gui_list->offset_position < 0)
gui_list->offset_position = 0;
}
void gui_list_screen_scroll_step(int ofs)
{
offset_step = ofs;
}
void gui_list_screen_scroll_out_of_view(bool enable)
{
if (enable)
offset_out_of_view = true;
else
offset_out_of_view = false;
}
#endif /* HAVE_LCD_BITMAP */
/*
* Synchronized lists stuffs
*/
void gui_synclist_init(
struct gui_synclist * lists,
list_get_name callback_get_item_name,
void * data
)
{
int i;
FOR_NB_SCREENS(i)
{
gui_list_init(&(lists->gui_list[i]),
callback_get_item_name,
data);
gui_list_set_display(&(lists->gui_list[i]), &(screens[i]));
}
}
void gui_synclist_set_nb_items(struct gui_synclist * lists, int nb_items)
{
int i;
FOR_NB_SCREENS(i)
{
gui_list_set_nb_items(&(lists->gui_list[i]), nb_items);
#ifdef HAVE_LCD_BITMAP
lists->gui_list[i].offset_position = 0;
#endif
}
}
void gui_synclist_set_icon_callback(struct gui_synclist * lists, list_get_icon icon_callback)
{
int i;
FOR_NB_SCREENS(i)
{
gui_list_set_icon_callback(&(lists->gui_list[i]), icon_callback);
}
}
void gui_synclist_draw(struct gui_synclist * lists)
{
int i;
FOR_NB_SCREENS(i)
gui_list_draw(&(lists->gui_list[i]));
}
void gui_synclist_select_item(struct gui_synclist * lists, int item_number)
{
int i;
FOR_NB_SCREENS(i)
gui_list_select_item(&(lists->gui_list[i]), item_number);
}
void gui_synclist_select_next(struct gui_synclist * lists)
{
int i;
FOR_NB_SCREENS(i)
gui_list_select_next(&(lists->gui_list[i]));
}
void gui_synclist_select_previous(struct gui_synclist * lists)
{
int i;
FOR_NB_SCREENS(i)
gui_list_select_previous(&(lists->gui_list[i]));
}
void gui_synclist_select_next_page(struct gui_synclist * lists,
enum screen_type screen)
{
int i;
FOR_NB_SCREENS(i)
gui_list_select_next_page(&(lists->gui_list[i]),
screens[screen].nb_lines);
}
void gui_synclist_select_previous_page(struct gui_synclist * lists,
enum screen_type screen)
{
int i;
FOR_NB_SCREENS(i)
gui_list_select_previous_page(&(lists->gui_list[i]),
screens[screen].nb_lines);
}
void gui_synclist_add_item(struct gui_synclist * lists)
{
int i;
FOR_NB_SCREENS(i)
gui_list_add_item(&(lists->gui_list[i]));
}
void gui_synclist_del_item(struct gui_synclist * lists)
{
int i;
FOR_NB_SCREENS(i)
gui_list_del_item(&(lists->gui_list[i]));
}
void gui_synclist_limit_scroll(struct gui_synclist * lists, bool scroll)
{
int i;
FOR_NB_SCREENS(i)
gui_list_limit_scroll(&(lists->gui_list[i]), scroll);
}
void gui_synclist_flash(struct gui_synclist * lists)
{
int i;
FOR_NB_SCREENS(i)
gui_list_flash(&(lists->gui_list[i]));
}
#ifdef HAVE_LCD_BITMAP
void gui_synclist_scroll_right(struct gui_synclist * lists)
{
int i;
FOR_NB_SCREENS(i)
gui_list_scroll_right(&(lists->gui_list[i]));
}
void gui_synclist_scroll_left(struct gui_synclist * lists)
{
int i;
FOR_NB_SCREENS(i)
gui_list_scroll_left(&(lists->gui_list[i]));
}
#endif /* HAVE_LCD_BITMAP */
unsigned gui_synclist_do_button(struct gui_synclist * lists, unsigned button)
{
gui_synclist_limit_scroll(lists, true);
switch(button)
{
case LIST_PREV:
#ifdef LIST_RC_PREV
case LIST_RC_PREV:
#endif
gui_synclist_limit_scroll(lists, false);
case LIST_PREV | BUTTON_REPEAT:
#ifdef LIST_RC_PREV
case LIST_RC_PREV | BUTTON_REPEAT:
#endif
gui_synclist_select_previous(lists);
gui_synclist_draw(lists);
yield();
return LIST_PREV;
case LIST_NEXT:
#ifdef LIST_RC_NEXT
case LIST_RC_NEXT:
#endif
gui_synclist_limit_scroll(lists, false);
case LIST_NEXT | BUTTON_REPEAT:
#ifdef LIST_RC_NEXT
case LIST_RC_NEXT | BUTTON_REPEAT:
#endif
gui_synclist_select_next(lists);
gui_synclist_draw(lists);
yield();
return LIST_NEXT;
#ifdef LIST_PGRIGHT
case LIST_PGRIGHT:
case LIST_PGRIGHT | BUTTON_REPEAT:
#ifdef LIST_RC_PGRIGHT
case LIST_RC_PGRIGHT:
case LIST_RC_PGRIGHT | BUTTON_REPEAT:
#endif
gui_synclist_scroll_right(lists);
gui_synclist_draw(lists);
return true;
#endif
#ifdef LIST_PGLEFT
case LIST_PGLEFT:
case LIST_PGLEFT | BUTTON_REPEAT:
#ifdef LIST_RC_PGLEFT
case LIST_RC_PGLEFT:
case LIST_RC_PGLEFT | BUTTON_REPEAT:
#endif
gui_synclist_scroll_left(lists);
gui_synclist_draw(lists);
return true;
#endif
/* for pgup / pgdown, we are obliged to have a different behaviour depending on the screen
* for which the user pressed the key since for example, remote and main screen doesn't
* have the same number of lines*/
#ifdef LIST_PGUP
case LIST_PGUP:
gui_synclist_limit_scroll(lists, false);
case LIST_PGUP | BUTTON_REPEAT:
gui_synclist_select_previous_page(lists, SCREEN_MAIN);
gui_synclist_draw(lists);
return LIST_NEXT;
#endif
#ifdef LIST_RC_PGUP
case LIST_RC_PGUP:
gui_synclist_limit_scroll(lists, false);
case LIST_RC_PGUP | BUTTON_REPEAT:
gui_synclist_select_previous_page(lists, SCREEN_REMOTE);
gui_synclist_draw(lists);
return LIST_NEXT;
#endif
#ifdef LIST_PGDN
case LIST_PGDN:
gui_synclist_limit_scroll(lists, false);
case LIST_PGDN | BUTTON_REPEAT:
gui_synclist_select_next_page(lists, SCREEN_MAIN);
gui_synclist_draw(lists);
return LIST_PREV;
#endif
#ifdef LIST_RC_PGDN
case LIST_RC_PGDN:
gui_synclist_limit_scroll(lists, false);
case LIST_RC_PGDN | BUTTON_REPEAT:
gui_synclist_select_next_page(lists, SCREEN_REMOTE);
gui_synclist_draw(lists);
return LIST_PREV;
#endif
}
return 0;
}
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