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Pixel-accurate (vertical) list scrolling for touchscreen targets.

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Looks much smoother now as you don't scroll by whole lines anymore.
Add some functions lcd driver to enable the line based scrolling engine to draw the lines with a pixel-based y-offset.
This should also allow for a sensible kinetic scrolling mechanism (still a todo).

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28214 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Thomas Martitz 2010-10-06 12:46:42 +00:00
parent 53a936ab83
commit d9d0b4dd20
6 changed files with 139 additions and 44 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

125
apps/gui/bitmap/list.c
View file

@ -48,11 +48,16 @@
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,
@ -157,9 +162,30 @@ void list_draw(struct screen *display, struct gui_synclist *list)
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)
@ -216,6 +242,7 @@ void list_draw(struct screen *display, struct gui_synclist *list)
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);
@ -285,36 +312,36 @@ void list_draw(struct screen *display, struct gui_synclist *list)
if (item_offset> item_width - (list_text_vp->width - text_pos))
{
/* don't scroll */
display->puts_style_offset(0, i-start, entry_name,
style, item_offset);
display->puts_style_xyoffset(0, line, entry_name,
style, item_offset, draw_offset);
}
else
{
display->puts_scroll_style_offset(0, i-start, entry_name,
style, item_offset);
display->puts_scroll_style_xyoffset(0, line, entry_name,
style, item_offset, draw_offset);
}
}
else
{
if (list->scroll_all)
display->puts_scroll_style_offset(0, i-start, entry_name,
style, item_offset);
display->puts_scroll_style_xyoffset(0, line, entry_name,
style, item_offset, draw_offset);
else
display->puts_style_offset(0, i-start, entry_name,
style, item_offset);
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,
(i-start),show_cursor?ICON_PADDING:0,0,
(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(display, 0, i-start, Icon_Cursor);
screen_put_icon_with_offset(display, 0, line, 0, draw_offset, Icon_Cursor);
}
}
display->set_viewport(parent);
@ -343,6 +370,8 @@ static int gui_synclist_touchscreen_scrollbar(struct gui_synclist * gui_list,
if (nb_lines < gui_list->nb_items)
{
scroll_mode = SCROLL_BAR;
/* 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;
@ -365,17 +394,49 @@ static int gui_synclist_touchscreen_scrollbar(struct gui_synclist * gui_list,
}
/*
* returns the number of scrolled items since the last call
* returns the number of pixel scrolled since the last call
**/
static int gui_synclist_touchscreen_scrolling(struct gui_synclist * gui_list, int position)
static int gui_synclist_touchscreen_scrolling(struct gui_synclist * gui_list, int line_height, int position)
{
const int screen = screens[SCREEN_MAIN].screen_type;
const int difference = position - last_position;
/* fixme */
const enum screen_type screen = screens[SCREEN_MAIN].screen_type;
const int nb_lines = viewport_get_nb_lines(&list_text[screen]);
if(nb_lines < gui_list->nb_items && difference != 0) /* only scroll if needed */
/* 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))
{
int new_start_item;
new_start_item = gui_list->start_item[screen] - difference;
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;
@ -384,22 +445,23 @@ static int gui_synclist_touchscreen_scrolling(struct gui_synclist * gui_list, in
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 int button = action_get_touchscreen_press(&x, &y);
const int screen = SCREEN_MAIN;
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 struct viewport *list_text_vp = &list_text[screen];
const bool old_released = released;
int line, list_width = list_text_vp->width;
/* make sure it is inside the UI viewport */
if (!viewport_point_within_vp(sb_skin_get_info_vp(screen), x, y))
return BUTTON_NONE;
if (button == ACTION_NONE || button == ACTION_UNKNOWN)
return ACTION_NONE;
released = (button&BUTTON_REL) != 0;
@ -473,15 +535,18 @@ unsigned gui_synclist_do_touchscreen(struct gui_synclist * gui_list)
int actual_y;
actual_y = y - list_text_vp->y;
line = actual_y / line_height;
/* selection needs to be corrected if an items are only
* partly 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;
/* Pressed a border */
if(UNLIKELY(actual_y % line_height == 0))
return ACTION_NONE;
}
if (released)
{
@ -524,9 +589,9 @@ unsigned gui_synclist_do_touchscreen(struct gui_synclist * gui_list)
/* select current item */
gui_synclist_select_item(gui_list, list_start_item+line);
if (last_position == 0)
last_position = line;
last_position = actual_y;
else
result = gui_synclist_touchscreen_scrolling(gui_list, line);
result = gui_synclist_touchscreen_scrolling(gui_list, line_height, actual_y);
/* Start scrolling once the pen is moved without
* releasing it inbetween */
@ -536,7 +601,7 @@ unsigned gui_synclist_do_touchscreen(struct gui_synclist * gui_list)
scroll_mode = SCROLL_SWIPE;
}
last_position = line;
last_position = actual_y;
return redraw ? ACTION_REDRAW:ACTION_NONE;
}

4
apps/screen_access.c
View file

@ -168,8 +168,10 @@ struct screen screens[NB_SCREENS] =
.hline=&lcd_hline,
.scroll_step=&lcd_scroll_step,
.puts_style_offset=&lcd_puts_style_offset,
.puts_style_xyoffset=&lcd_puts_style_xyoffset,
.puts_scroll_style=&lcd_puts_scroll_style,
.puts_scroll_style_offset=&lcd_puts_scroll_style_offset,
.puts_scroll_style_xyoffset=&lcd_puts_scroll_style_xyoffset,
#endif /* HAVE_LCD_BITMAP */
#ifdef HAVE_LCD_CHARCELLS
@ -257,8 +259,10 @@ struct screen screens[NB_SCREENS] =
.hline=&lcd_remote_hline,
.scroll_step=&lcd_remote_scroll_step,
.puts_style_offset=&lcd_remote_puts_style_offset,
.puts_style_xyoffset=&lcd_remote_puts_style_xyoffset,
.puts_scroll_style=&lcd_remote_puts_scroll_style,
.puts_scroll_style_offset=&lcd_remote_puts_scroll_style_offset,
.puts_scroll_style_xyoffset=&lcd_remote_puts_scroll_style_xyoffset,
#endif /* 1 */
#if 0 /* no charcell remote LCDs so far */

12
apps/screen_access.h
View file

@ -77,11 +77,15 @@ struct screen
void (*scroll_step)(int pixels);
void (*puts_style_offset)(int x, int y, const unsigned char *str,
int style, int offset);
int style, int x_offset);
void (*puts_style_xyoffset)(int x, int y, const unsigned char *str,
int style, int x_offset, int y_offset);
void (*puts_scroll_style)(int x, int y, const unsigned char *string,
int style);
void (*puts_scroll_style_offset)(int x, int y, const unsigned char *string,
int style, int offset);
int style, int x_offset);
void (*puts_scroll_style_xyoffset)(int x, int y, const unsigned char *string,
int style, int x_offset, int y_offset);
void (*mono_bitmap)(const unsigned char *src,
int x, int y, int width, int height);
void (*mono_bitmap_part)(const unsigned char *src, int src_x, int src_y,
@ -134,7 +138,9 @@ struct screen
void (*puts_offset)(int x, int y, const unsigned char *str, int offset);
void (*puts_scroll)(int x, int y, const unsigned char *string);
void (*puts_scroll_offset)(int x, int y, const unsigned char *string,
int offset);
int x_offset);
void (*puts_scroll_xyoffset)(int x, int y, const unsigned char *string,
int x_offset, int y_offset);
void (*scroll_speed)(int speed);
void (*scroll_delay)(int ms);
void (*stop_scroll)(void);

31
firmware/drivers/lcd-bitmap-common.c
View file

@ -284,8 +284,8 @@ static void LCDFN(putsxyofs_style)(int xpos, int ypos,
/*** Line oriented text output ***/
/* put a string at a given char position */
void LCDFN(puts_style_offset)(int x, int y, const unsigned char *str,
int style, int offset)
void LCDFN(puts_style_xyoffset)(int x, int y, const unsigned char *str,
int style, int x_offset, int y_offset)
{
int xpos, ypos, w, h;
LCDFN(scroll_stop_line)(current_vp, y);
@ -294,8 +294,14 @@ void LCDFN(puts_style_offset)(int x, int y, const unsigned char *str,
LCDFN(getstringsize)(str, &w, &h);
xpos = x * LCDFN(getstringsize)(" ", NULL, NULL);
ypos = y * h;
LCDFN(putsxyofs_style)(xpos, ypos, str, style, w, h, offset);
ypos = y * h + y_offset;
LCDFN(putsxyofs_style)(xpos, ypos, str, style, w, h, x_offset);
}
void LCDFN(puts_style_offset)(int x, int y, const unsigned char *str,
int style, int x_offset)
{
LCDFN(puts_style_xyoffset)(x, y, str, style, x_offset, 0);
}
void LCDFN(puts)(int x, int y, const unsigned char *str)
@ -326,8 +332,8 @@ void LCDFN(puts_offset)(int x, int y, const unsigned char *str, int offset)
/*** scrolling ***/
void LCDFN(puts_scroll_style_offset)(int x, int y, const unsigned char *string,
int style, int offset)
void LCDFN(puts_scroll_style_xyoffset)(int x, int y, const unsigned char *string,
int style, int x_offset, int y_offset)
{
struct scrollinfo* s;
char *end;
@ -343,7 +349,7 @@ void LCDFN(puts_scroll_style_offset)(int x, int y, const unsigned char *string,
if (LCDFN(scroll_info).lines >= LCDM(SCROLLABLE_LINES)) return;
if (!string)
return;
LCDFN(puts_style_offset)(x, y, string, style, offset);
LCDFN(puts_style_xyoffset)(x, y, string, style, x_offset, y_offset);
LCDFN(getstringsize)(string, &w, &h);
@ -381,8 +387,9 @@ void LCDFN(puts_scroll_style_offset)(int x, int y, const unsigned char *string,
s->vp = current_vp;
s->y = y;
s->offset = offset;
s->offset = x_offset;
s->startx = x * LCDFN(getstringsize)(" ", NULL, NULL);
s->y_offset = y_offset;
s->backward = false;
LCDFN(scroll_info).lines++;
@ -429,7 +436,7 @@ void LCDFN(scroll_fn)(void)
pf = font_get(current_vp->font);
xpos = s->startx;
ypos = s->y * pf->height;
ypos = s->y * pf->height + s->y_offset;
if (s->bidir) { /* scroll bidirectional */
if (s->offset <= 0) {
@ -457,3 +464,9 @@ void LCDFN(scroll_fn)(void)
}
LCDFN(set_viewport)(old_vp);
}
void LCDFN(puts_scroll_style_offset)(int x, int y, const unsigned char *string,
int style, int x_offset)
{
LCDFN(puts_scroll_style_xyoffset)(x, y, string, style, x_offset, 0);
}

10
firmware/export/lcd.h
View file

@ -192,6 +192,8 @@ extern void lcd_clear_viewport(void);
extern void lcd_clear_display(void);
extern void lcd_putsxy(int x, int y, const unsigned char *string);
extern void lcd_putsxyf(int x, int y, const unsigned char *fmt, ...);
extern void lcd_putsxy_style_offset(int x, int y, const unsigned char *str,
int style, int offset);
extern void lcd_puts(int x, int y, const unsigned char *string);
extern void lcd_putsf(int x, int y, const unsigned char *fmt, ...);
extern void lcd_puts_style(int x, int y, const unsigned char *string, int style);
@ -480,9 +482,13 @@ extern void lcd_setfont(int font);
extern int lcd_getfont(void);
extern void lcd_puts_style_offset(int x, int y, const unsigned char *str,
int style, int offset);
int style, int x_offset);
extern void lcd_puts_style_xyoffset(int x, int y, const unsigned char *str,
int style, int x_offset, int y_offset);
extern void lcd_puts_scroll_style_offset(int x, int y, const unsigned char *string,
int style, int offset);
int style, int x_offset);
extern void lcd_puts_scroll_style_xyoffset(int x, int y, const unsigned char *string,
int style, int x_offset, int y_offset);
/* low level drawing function pointer arrays */
#if LCD_DEPTH >= 8

1
firmware/export/scroll_engine.h
View file

@ -56,6 +56,7 @@ struct scrollinfo
int y; /* Position of the line on the screen (char co-ordinates) */
int offset;
int startx;
int y_offset; /* y offset of the line, used for pixel-accurate list scrolling */
#ifdef HAVE_LCD_BITMAP
int width; /* length of line in pixels */
int style; /* line style */