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rockbox/apps/gui/bitmap/list.c
Thomas Martitz b39a4933cb Fix several inaccuracies in list handling on touchscreen. 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28221 a1c6a512-1295-4272-9138-f99709370657
2010-10-09 11:22:52 +00:00

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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2007 by Jonathan Gordon
*
* 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.
*
****************************************************************************/
/* This file contains the code to draw the list widget on BITMAP LCDs. */
#include "config.h"
#include "lcd.h"
#include "font.h"
#include "button.h"
#include "string.h"
#include "settings.h"
#include "kernel.h"
#include "system.h"
#include "file.h"
#include "action.h"
#include "screen_access.h"
#include "list.h"
#include "scrollbar.h"
#include "lang.h"
#include "sound.h"
#include "misc.h"
#include "viewport.h"
#include "statusbar-skinned.h"
#include "debug.h"
#define ICON_PADDING 1
/* these are static to make scrolling work */
static struct viewport list_text[NB_SCREENS], title_text[NB_SCREENS];
#ifdef HAVE_TOUCHSCREEN
/* difference in pixels between draws, above it means enough to start scrolling */
#define SCROLL_BEGIN_THRESHOLD 3
static enum {
SCROLL_NONE, /* no scrolling */
SCROLL_BAR, /* scroll by using the scrollbar */
SCROLL_SWIPE, /* scroll by wiping over the screen */
} scroll_mode;
static int y_offset;
#endif
int gui_list_get_item_offset(struct gui_synclist * gui_list, int item_width,
int text_pos, struct screen * display,
struct viewport *vp);
bool list_display_title(struct gui_synclist *list, enum screen_type screen);
void gui_synclist_scroll_stop(struct gui_synclist *lists)
{
int i;
FOR_NB_SCREENS(i)
{
screens[i].scroll_stop(&list_text[i]);
screens[i].scroll_stop(&title_text[i]);
screens[i].scroll_stop(lists->parent[i]);
}
}
/* Draw the list...
internal screen layout:
-----------------
|TI| title | TI is title icon
-----------------
| | | |
|S|I| | S - scrollbar
| | | items | I - icons
| | | |
------------------
Note: This image is flipped horizontally when the language is a
right-to-left one (Hebrew, Arabic)
*/
static bool draw_title(struct screen *display, struct gui_synclist *list)
{
const int screen = display->screen_type;
int style = STYLE_DEFAULT;
struct viewport *title_text_vp = &title_text[screen];
if (sb_set_title_text(list->title, list->title_icon, screen))
return false; /* the sbs is handling the title */
display->scroll_stop(title_text_vp);
if (!list_display_title(list, screen))
return false;
*title_text_vp = *(list->parent[screen]);
title_text_vp->height = font_get(title_text_vp->font)->height;
if (list->title_icon != Icon_NOICON && global_settings.show_icons)
{
struct viewport title_icon = *title_text_vp;
title_icon.width = get_icon_width(screen) + ICON_PADDING * 2;
if (VP_IS_RTL(&title_icon))
{
title_icon.x += title_text_vp->width - title_icon.width;
}
else
{
title_text_vp->x += title_icon.width;
}
title_text_vp->width -= title_icon.width;
display->set_viewport(&title_icon);
screen_put_icon(display, 0, 0, list->title_icon);
}
#ifdef HAVE_LCD_COLOR
if (list->title_color >= 0)
{
style |= (STYLE_COLORED|list->title_color);
}
#endif
display->set_viewport(title_text_vp);
display->puts_scroll_style(0, 0, list->title, style);
return true;
}
void list_draw(struct screen *display, struct gui_synclist *list)
{
struct viewport list_icons;
int start, end, line_height, style, i;
const int screen = display->screen_type;
const int list_start_item = list->start_item[screen];
const int icon_width = get_icon_width(screen) + ICON_PADDING;
const bool scrollbar_in_left = (global_settings.scrollbar == SCROLLBAR_LEFT);
const bool show_cursor = !global_settings.cursor_style &&
list->show_selection_marker;
struct viewport *parent = (list->parent[screen]);
#ifdef HAVE_LCD_COLOR
unsigned char cur_line = 0;
#endif
int item_offset;
bool show_title;
struct viewport *list_text_vp = &list_text[screen];
line_height = font_get(parent->font)->height;
display->set_viewport(parent);
display->clear_viewport();
display->scroll_stop(list_text_vp);
*list_text_vp = *parent;
if ((show_title = draw_title(display, list)))
{
list_text_vp->y += line_height;
list_text_vp->height -= line_height;
}
start = list_start_item;
end = start + viewport_get_nb_lines(list_text_vp);
#ifdef HAVE_TOUCHSCREEN
if (list->selected_item == 0)
y_offset = 0; /* reset in case it's a new list */
int draw_offset = y_offset;
/* draw some extra items to not have empty lines at the top and bottom */
if (y_offset > 0)
{
/* make it negative for more consistent apparence when switching
* directions */
draw_offset -= line_height;
if (start > 0)
start--;
}
else if (y_offset < 0)
end++;
#else
#define draw_offset 0
#endif
/* draw the scrollbar if its needed */
if (global_settings.scrollbar &&
viewport_get_nb_lines(list_text_vp) < list->nb_items)
{
struct viewport vp = *list_text_vp;
vp.width = SCROLLBAR_WIDTH;
vp.height = line_height * viewport_get_nb_lines(list_text_vp);
vp.x = parent->x;
list_text_vp->width -= SCROLLBAR_WIDTH;
if (scrollbar_in_left)
list_text_vp->x += SCROLLBAR_WIDTH;
else
vp.x += list_text_vp->width;
display->set_viewport(&vp);
gui_scrollbar_draw(display,
(scrollbar_in_left? 0: 1), 0, SCROLLBAR_WIDTH-1, vp.height,
list->nb_items, list_start_item, list_start_item + end-start,
VERTICAL);
}
else if (show_title)
{
/* shift everything a bit in relation to the title... */
if (!VP_IS_RTL(list_text_vp) && scrollbar_in_left)
{
list_text_vp->width -= SCROLLBAR_WIDTH;
list_text_vp->x += SCROLLBAR_WIDTH;
}
else if (VP_IS_RTL(list_text_vp) && !scrollbar_in_left)
{
list_text_vp->width -= SCROLLBAR_WIDTH;
}
}
/* setup icon placement */
list_icons = *list_text_vp;
int icon_count = (list->callback_get_item_icon != NULL) ? 1 : 0;
if (show_cursor)
icon_count++;
if (icon_count)
{
list_icons.width = icon_width * icon_count;
list_text_vp->width -= list_icons.width + ICON_PADDING;
if (VP_IS_RTL(&list_icons))
list_icons.x += list_text_vp->width + ICON_PADDING;
else
list_text_vp->x += list_icons.width + ICON_PADDING;
}
for (i=start; i<end && i<list->nb_items; i++)
{
/* do the text */
unsigned const char *s;
char entry_buffer[MAX_PATH];
unsigned char *entry_name;
int text_pos = 0;
int line = i - start;
s = list->callback_get_item_name(i, list->data, entry_buffer,
sizeof(entry_buffer));
entry_name = P2STR(s);
display->set_viewport(list_text_vp);
style = STYLE_DEFAULT;
/* position the string at the correct offset place */
int item_width,h;
display->getstringsize(entry_name, &item_width, &h);
item_offset = gui_list_get_item_offset(list, item_width, text_pos,
display, list_text_vp);
#ifdef HAVE_LCD_COLOR
/* if the list has a color callback */
if (list->callback_get_item_color)
{
int color = list->callback_get_item_color(i, list->data);
/* if color selected */
if (color >= 0)
{
style |= STYLE_COLORED|color;
}
}
#endif
/* draw the selected line */
if(
#ifdef HAVE_TOUCHSCREEN
/* don't draw it during scrolling */
scroll_mode == SCROLL_NONE &&
#endif
i >= list->selected_item
&& i < list->selected_item + list->selected_size
&& list->show_selection_marker)
{/* The selected item must be displayed scrolling */
if (global_settings.cursor_style == 1
#ifdef HAVE_REMOTE_LCD
/* the global_settings.cursor_style check is here to make
* sure if they want the cursor instead of bar it will work
*/
|| (display->depth < 16 && global_settings.cursor_style)
#endif
)
{
/* Display inverted-line-style */
style = STYLE_INVERT;
}
#ifdef HAVE_LCD_COLOR
else if (global_settings.cursor_style == 2)
{
/* Display colour line selector */
style = STYLE_COLORBAR;
}
else if (global_settings.cursor_style == 3)
{
/* Display gradient line selector */
style = STYLE_GRADIENT;
/* Make the lcd driver know how many lines the gradient should
cover and current line number */
/* number of selected lines */
style |= NUMLN_PACK(list->selected_size);
/* current line number, zero based */
style |= CURLN_PACK(cur_line);
cur_line++;
}
#endif
/* if the text is smaller than the viewport size */
if (item_offset> item_width - (list_text_vp->width - text_pos))
{
/* don't scroll */
display->puts_style_xyoffset(0, line, entry_name,
style, item_offset, draw_offset);
}
else
{
display->puts_scroll_style_xyoffset(0, line, entry_name,
style, item_offset, draw_offset);
}
}
else
{
if (list->scroll_all)
display->puts_scroll_style_xyoffset(0, line, entry_name,
style, item_offset, draw_offset);
else
display->puts_style_xyoffset(0, line, entry_name,
style, item_offset, draw_offset);
}
/* do the icon */
display->set_viewport(&list_icons);
if (list->callback_get_item_icon && global_settings.show_icons)
{
screen_put_icon_with_offset(display, show_cursor?1:0,
(line),show_cursor?ICON_PADDING:0,draw_offset,
list->callback_get_item_icon(i, list->data));
}
if (show_cursor && i >= list->selected_item &&
i < list->selected_item + list->selected_size)
{
screen_put_icon_with_offset(display, 0, line, 0, draw_offset, Icon_Cursor);
}
}
display->set_viewport(parent);
display->update_viewport();
display->set_viewport(NULL);
}
#if defined(HAVE_TOUCHSCREEN)
/* This needs to be fixed if we ever get more than 1 touchscreen on a target. */
static bool released = false;
/* Used for kinetic scrolling as we need to know the last position to
* recognize the scroll direction.
* This gets reset to 0 at the end of scrolling
*/
static int last_position=0;
static int gui_synclist_touchscreen_scrollbar(struct gui_synclist * gui_list,
int y)
{
const int screen = screens[SCREEN_MAIN].screen_type;
const int nb_lines = viewport_get_nb_lines(&list_text[screen]);
if (nb_lines < gui_list->nb_items)
{
/* scrollbar scrolling is still line based */
y_offset = 0;
int scrollbar_size = nb_lines*
font_get(gui_list->parent[screen]->font)->height;
int actual_y = y - list_text[screen].y;
int new_selection = (actual_y * gui_list->nb_items)
/ scrollbar_size;
int start_item = new_selection - nb_lines/2;
if(start_item < 0)
start_item = 0;
else if(start_item > gui_list->nb_items - nb_lines)
start_item = gui_list->nb_items - nb_lines;
gui_list->start_item[screen] = start_item;
return ACTION_REDRAW;
}
return ACTION_NONE;
}
/*
* returns the number of pixel scrolled since the last call
**/
static int gui_synclist_touchscreen_scrolling(struct gui_synclist * gui_list, int line_height, int position)
{
/* fixme */
const enum screen_type screen = screens[SCREEN_MAIN].screen_type;
const int nb_lines = viewport_get_nb_lines(&list_text[screen]);
/* in pixels */
const int difference = position - last_position;
/* make selecting items easier */
if (abs(difference) < SCROLL_BEGIN_THRESHOLD && scroll_mode == SCROLL_NONE)
return 0;
/* does the list even scroll? if no, return but still show
* the caller that we would scroll */
if (nb_lines >= gui_list->nb_items)
return difference;
const int old_start = gui_list->start_item[screen];
int new_start_item = -1;
int line_diff = 0;
/* don't scroll at the edges of the list */
if ((old_start == 0 && difference > 0)
|| (old_start == (gui_list->nb_items - nb_lines) && difference < 0))
{
y_offset = 0;
return difference;
}
/* add up y_offset over time and translate to lines
* if scrolled enough */
y_offset += difference;
if (abs(y_offset) > line_height)
{
line_diff = y_offset/line_height;
y_offset -= line_diff * line_height;
}
if(line_diff != 0)
{
new_start_item = old_start - line_diff;
/* check if new_start_item is bigger than list item count */
if(new_start_item > gui_list->nb_items - nb_lines)
new_start_item = gui_list->nb_items - nb_lines;
/* set new_start_item to 0 if it's negative */
if(new_start_item < 0)
new_start_item = 0;
gui_list->start_item[screen] = new_start_item;
}
return difference;
}
unsigned gui_synclist_do_touchscreen(struct gui_synclist * gui_list)
{
short x, y;
const enum screen_type screen = SCREEN_MAIN;
struct viewport *info_vp = sb_skin_get_info_vp(screen);
const int button = action_get_touchscreen_press_in_vp(&x, &y, info_vp);
const int list_start_item = gui_list->start_item[screen];
const int line_height = font_get(gui_list->parent[screen]->font)->height;
const struct viewport *list_text_vp = &list_text[screen];
const bool old_released = released;
const bool show_title = list_display_title(gui_list, screen);
const bool show_cursor = !global_settings.cursor_style &&
gui_list->show_selection_marker;
const bool on_title_clicked = show_title && y < line_height;
int icon_width = 0;
int line, list_width = list_text_vp->width;
if (button == ACTION_NONE || button == ACTION_UNKNOWN)
return ACTION_NONE;
/* x and y are relative to info_vp */
if (global_settings.show_icons)
icon_width += get_icon_width(screen);
if (show_cursor)
icon_width += get_icon_width(screen);
released = (button&BUTTON_REL) != 0;
if (button == BUTTON_NONE)
return ACTION_NONE;
if (on_title_clicked)
{
if (x < icon_width)
{
/* Top left corner is GO_TO_ROOT */
if (button == BUTTON_REL)
return ACTION_STD_MENU;
else if (button == (BUTTON_REPEAT|BUTTON_REL))
return ACTION_STD_CONTEXT;
return ACTION_NONE;
}
else /* click on title text is cancel */
if (button == BUTTON_REL && scroll_mode == SCROLL_NONE)
return ACTION_STD_CANCEL;
}
else /* list area clicked */
{
const int actual_y = y - (show_title ? line_height : 0);
bool on_scrollbar_clicked;
switch (global_settings.scrollbar)
{
case SCROLLBAR_LEFT:
on_scrollbar_clicked = x <= SCROLLBAR_WIDTH; break;
case SCROLLBAR_RIGHT:
on_scrollbar_clicked = x > (icon_width + list_width); break;
default:
on_scrollbar_clicked = false; break;
}
/* conditions for scrollbar scrolling:
* * pen is on the scrollbar
* AND scrollbar is on the right (left case is handled above)
* OR * pen is in the somewhere else but we did scrollbar scrolling before
*
* scrollbar scrolling must end if the pen is released
* scrollbar scrolling must not happen if we're currently scrolling
* via swiping the screen
**/
if (!released && scroll_mode < SCROLL_SWIPE &&
(on_scrollbar_clicked || scroll_mode == SCROLL_BAR))
{
scroll_mode = SCROLL_BAR;
return gui_synclist_touchscreen_scrollbar(gui_list, y);
}
/* |--------------------------------------------------------|
* | Description of the touchscreen list interface: |
* |--------------------------------------------------------|
* | Pressing an item will select it and "enter" it. |
* | |
* | Pressing and holding your pen down will scroll through |
* | the list of items. |
* | |
* | Pressing and holding your pen down on a single item |
* | will bring up the context menu of it. |
* |--------------------------------------------------------|
*/
if (actual_y > 0 || button & BUTTON_REPEAT)
{
/* selection needs to be corrected if an items are only
* partially visible */
line = (actual_y - y_offset) / line_height;
/* Pressed below the list*/
if (list_start_item + line >= gui_list->nb_items)
{
/* don't collect last_position outside of the list area
* it'd break selecting after such a situation */
last_position = 0;
return ACTION_NONE;
}
if (released)
{
/* Pen was released anywhere on the screen */
last_position = 0;
if (scroll_mode == SCROLL_NONE)
{
gui_synclist_select_item(gui_list, list_start_item + line);
/* If BUTTON_REPEAT is set, then the pen was hold on
* the same line for some time
* -> context menu
* otherwise,
* -> select
**/
if (button & BUTTON_REPEAT)
return ACTION_STD_CONTEXT;
return ACTION_STD_OK;
}
else
{
/* we were scrolling
* -> reset scrolling but do nothing else */
scroll_mode = SCROLL_NONE;
return ACTION_NONE;
}
}
else
{ /* pen is on the screen */
int result = 0;
bool redraw = false;
/* beginning of list interaction denoted by release in
* the previous call */
if (old_released)
{
scroll_mode = SCROLL_NONE;
redraw = true;
}
/* select current item */
gui_synclist_select_item(gui_list, list_start_item+line);
if (last_position == 0)
last_position = actual_y;
else
result = gui_synclist_touchscreen_scrolling(gui_list, line_height, actual_y);
/* Start scrolling once the pen is moved without
* releasing it inbetween */
if (result)
{
redraw = true;
scroll_mode = SCROLL_SWIPE;
}
last_position = actual_y;
return redraw ? ACTION_REDRAW:ACTION_NONE;
}
}
}
return ACTION_NONE;
}
#endif
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