Nyaaori/rockbox
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
rockbox/apps/gui/bitmap/list.c
Georg Gadinger 512be370c6 list: reset viewport to avoid corrupting the text in the first line 
While using Rockbox for a while on my 1st-gen iPod mini I noticed that
the first entry of a list sometimes displays a wrong character at the
18th column.  For example, the ':' character would display as 'z', the
'-' character as 'm', 0x00 would display '@' and so on.  Oddly enough
this only occurred when the scrollbar was enabled.

I figured that the call to `display->set_viewport(list_text_vp);` in the
for loop inside `list_draw(...)` causes this.  Digging deeper I noticed
that in the `lcd-bitmap-common.c` driver the `current_viewport` was
pointing to the start of the line's text.  From what I can tell the
cause of this was that the viewport was set to a struct with a shorter
scope than the entire function.

The actual fix for this is quite straightforward -- once the scrollbar
has been drawn the viewport is now changed back to the default one.

Change-Id: Id6a7bd8f74864641ea1670fedea9d12d764e78c0
2020-12-12 05:36:42 +00:00

851 lines
28 KiB
C
Raw Blame History

/***************************************************************************
* __________ __ ___.
* 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 "system.h"
#include "lcd.h"
#include "font.h"
#include "button.h"
#include "string.h"
#include "settings.h"
#include "kernel.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"
#include "line.h"
#define ICON_PADDING 1
#define ICON_PADDING_S "1"
/* these are static to make scrolling work */
static struct viewport list_text[NB_SCREENS], title_text[NB_SCREENS];
#ifdef HAVE_TOUCHSCREEN
static int y_offset;
static bool hide_selection;
#endif
/* list-private helpers from the generic list.c (move to header?) */
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);
int list_get_nb_lines(struct gui_synclist *list, enum screen_type screen);
void gui_synclist_scroll_stop(struct gui_synclist *lists)
{
FOR_NB_SCREENS(i)
{
screens[i].scroll_stop_viewport(&list_text[i]);
screens[i].scroll_stop_viewport(&title_text[i]);
screens[i].scroll_stop_viewport(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 int list_icon_width(enum screen_type screen)
{
return get_icon_width(screen) + ICON_PADDING * 2;
}
static bool draw_title(struct screen *display, struct gui_synclist *list)
{
const int screen = display->screen_type;
struct viewport *title_text_vp = &title_text[screen];
struct line_desc line = LINE_DESC_DEFINIT;
if (sb_set_title_text(list->title, list->title_icon, screen))
return false; /* the sbs is handling the title */
display->scroll_stop_viewport(title_text_vp);
if (!list_display_title(list, screen))
return false;
*title_text_vp = *(list->parent[screen]);
line.height = list->line_height[screen];
title_text_vp->height = line.height;
#if LCD_DEPTH > 1
/* XXX: Do we want to support the separator on remote displays? */
if (display->screen_type == SCREEN_MAIN && global_settings.list_separator_height != 0)
line.separator_height = abs(global_settings.list_separator_height)
+ (lcd_get_dpi() > 200 ? 2 : 1);
#endif
#ifdef HAVE_LCD_COLOR
if (list->title_color >= 0)
line.style |= (STYLE_COLORED|list->title_color);
#endif
line.scroll = true;
display->set_viewport(title_text_vp);
if (list->title_icon != Icon_NOICON && global_settings.show_icons)
put_line(display, 0, 0, &line, "$"ICON_PADDING_S"I$t",
list->title_icon, list->title);
else
put_line(display, 0, 0, &line, "$t", list->title);
return true;
}
void list_draw(struct screen *display, struct gui_synclist *list)
{
int start, end, item_offset, i;
const int screen = display->screen_type;
const int list_start_item = list->start_item[screen];
const bool scrollbar_in_left = (global_settings.scrollbar == SCROLLBAR_LEFT);
const bool scrollbar_in_right = (global_settings.scrollbar == SCROLLBAR_RIGHT);
const bool show_cursor = !global_settings.cursor_style &&
list->show_selection_marker;
const bool have_icons = global_settings.show_icons && list->callback_get_item_icon;
struct viewport *parent = (list->parent[screen]);
struct line_desc linedes = LINE_DESC_DEFINIT;
bool show_title;
struct viewport *list_text_vp = &list_text[screen];
int indent = 0;
struct viewport * last_vp = display->set_viewport(parent);
display->clear_viewport();
display->scroll_stop_viewport(list_text_vp);
*list_text_vp = *parent;
if ((show_title = draw_title(display, list)))
{
int title_height = title_text[screen].height;
list_text_vp->y += title_height;
list_text_vp->height -= title_height;
}
const int nb_lines = list_get_nb_lines(list, screen);
linedes.height = list->line_height[screen];
linedes.nlines = list->selected_size;
#if LCD_DEPTH > 1
/* XXX: Do we want to support the separator on remote displays? */
if (display->screen_type == SCREEN_MAIN)
linedes.separator_height = abs(global_settings.list_separator_height);
#endif
start = list_start_item;
end = start + nb_lines;
#ifdef HAVE_TOUCHSCREEN
if (list->selected_item == 0 || (list->nb_items < nb_lines))
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 -= linedes.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 != SCROLLBAR_OFF)
{
/* if the scrollbar is shown the text viewport needs to shrink */
if (nb_lines < list->nb_items)
{
struct viewport vp = *list_text_vp;
vp.width = SCROLLBAR_WIDTH;
vp.height = linedes.height * nb_lines;
list_text_vp->width -= SCROLLBAR_WIDTH;
if (scrollbar_in_right)
vp.x += list_text_vp->width;
else /* left */
list_text_vp->x += SCROLLBAR_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 + nb_lines,
VERTICAL);
}
/* shift everything a bit in relation to the title */
else if (!VP_IS_RTL(list_text_vp) && scrollbar_in_left)
indent += SCROLLBAR_WIDTH;
else if (VP_IS_RTL(list_text_vp) && scrollbar_in_right)
indent += SCROLLBAR_WIDTH;
}
display->set_viewport(list_text_vp);
for (i=start; i<end && i<list->nb_items; i++)
{
/* do the text */
enum themable_icons icon;
unsigned const char *s;
char entry_buffer[MAX_PATH];
unsigned char *entry_name;
int text_pos = 0;
int line = i - start;
int line_indent = 0;
int style = STYLE_DEFAULT;
bool is_selected = false;
s = list->callback_get_item_name(i, list->data, entry_buffer,
sizeof(entry_buffer));
entry_name = P2STR(s);
while (*entry_name == '\t')
{
line_indent++;
entry_name++;
}
if (line_indent)
{
if (global_settings.show_icons)
line_indent *= list_icon_width(screen);
else
line_indent *= display->getcharwidth();
}
line_indent += indent;
/* 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);
/* draw the selected line */
if(
#ifdef HAVE_TOUCHSCREEN
/* don't draw it during scrolling */
!hide_selection &&
#endif
i >= list->selected_item
&& i < list->selected_item + list->selected_size
&& list->show_selection_marker)
{/* The selected item must be displayed scrolling */
#ifdef HAVE_LCD_COLOR
if (list->selection_color)
{
/* Display gradient line selector */
style = STYLE_GRADIENT;
linedes.text_color = list->selection_color->text_color;
linedes.line_color = list->selection_color->line_color;
linedes.line_end_color = list->selection_color->line_end_color;
}
else
#endif
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;
linedes.text_color = global_settings.lst_color;
linedes.line_color = global_settings.lss_color;
}
else if (global_settings.cursor_style == 3)
{
/* Display gradient line selector */
style = STYLE_GRADIENT;
linedes.text_color = global_settings.lst_color;
linedes.line_color = global_settings.lss_color;
linedes.line_end_color = global_settings.lse_color;
}
#endif
is_selected = true;
}
#ifdef HAVE_LCD_COLOR
/* if the list has a color callback */
if (list->callback_get_item_color)
{
int c = list->callback_get_item_color(i, list->data);
if (c >= 0)
{ /* if color selected */
linedes.text_color = c;
style |= STYLE_COLORED;
}
}
#endif
linedes.style = style;
linedes.scroll = is_selected ? true : list->scroll_all;
linedes.line = i % list->selected_size;
icon = list->callback_get_item_icon ?
list->callback_get_item_icon(i, list->data) : Icon_NOICON;
/* the list can have both, one of or neither of cursor and item icons,
* if both don't apply icon padding twice between the icons */
if (show_cursor && have_icons)
put_line(display, 0, line * linedes.height + draw_offset,
&linedes, "$*s$"ICON_PADDING_S"I$i$"ICON_PADDING_S"s$*t",
line_indent, is_selected ? Icon_Cursor : Icon_NOICON,
icon, item_offset, entry_name);
else if (show_cursor || have_icons)
put_line(display, 0, line * linedes.height + draw_offset,
&linedes, "$*s$"ICON_PADDING_S"I$*t", line_indent,
show_cursor ? (is_selected ? Icon_Cursor:Icon_NOICON):icon,
item_offset, entry_name);
else
put_line(display, 0, line * linedes.height + draw_offset,
&linedes, "$*s$*t", line_indent, item_offset, entry_name);
}
display->set_viewport(parent);
display->update_viewport();
display->set_viewport(last_vp);
}
#if defined(HAVE_TOUCHSCREEN)
/* This needs to be fixed if we ever get more than 1 touchscreen on a target. */
/* 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_KINETIC, /* state after releasing swipe */
} scroll_mode;
static int scrollbar_scroll(struct gui_synclist * gui_list,
int y)
{
const int screen = screens[SCREEN_MAIN].screen_type;
const int nb_lines = list_get_nb_lines(gui_list, screen);
if (nb_lines < gui_list->nb_items)
{
/* scrollbar scrolling is still line based */
y_offset = 0;
int scrollbar_size = nb_lines*gui_list->line_height[screen];
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;
}
/* kinetic scrolling, based on
*
* v = a*t + v0 and ds = v*dt
*
* In each (fixed interval) timeout, the list is advanced by ds, then
* the v is reduced by a.
* This way we get a linear and smooth deceleration of the scrolling
*
* As v is the difference of distance per time unit, v is passed (as
* pixels moved since the last call) to the scrolling function which takes
* care of the pixel accurate drawing
*
* v0 is dertermined by averaging the last 4 movements of the list
* (the pixel and time difference is used to compute each v)
*
* influenced by http://stechz.com/tag/kinetic/
* We take the easy and smooth first approach (until section "Drawbacks"),
* since its drawbacks don't apply for us since our timers seem to be
* relatively accurate
*/
#define SIGN(a) ((a) < 0 ? -1 : 1)
/* these could possibly be configurable */
/* the lower the smoother */
#define RELOAD_INTERVAL (HZ/25)
/* the higher the earler the list stops */
#define DECELERATION (1000*RELOAD_INTERVAL/HZ)
/* this array holds data to compute the initial velocity v0 */
static struct kinetic_info {
int difference;
long ticks;
} kinetic_data[4];
static size_t cur_idx;
static struct cb_data {
struct gui_synclist *list; /* current list */
int velocity; /* in pixel/s */
} cb_data;
/* data member points to the above struct */
static struct timeout kinetic_tmo;
static bool is_kinetic_over(void)
{
return !cb_data.velocity && (scroll_mode == SCROLL_KINETIC);
}
/*
* collect data about how fast the list is moved in order to compute
* the initial velocity from it later */
static void kinetic_stats_collect(const int difference)
{
static long last_tick;
/* collect velocity statistics */
kinetic_data[cur_idx].difference = difference;
kinetic_data[cur_idx].ticks = current_tick - last_tick;
last_tick = current_tick;
cur_idx += 1;
if (cur_idx >= ARRAYLEN(kinetic_data))
cur_idx = 0; /* rewind the index */
}
/*
* resets the statistic */
static void kinetic_stats_reset(void)
{
memset(kinetic_data, 0, sizeof(kinetic_data));
cur_idx = 0;
}
/* cancels all currently active kinetic scrolling */
static void kinetic_force_stop(void)
{
timeout_cancel(&kinetic_tmo);
kinetic_stats_reset();
}
/* helper for gui/list.c to cancel scrolling if a normal button event comes
* through dpad or keyboard or whatever */
void _gui_synclist_stop_kinetic_scrolling(void)
{
y_offset = 0;
if (scroll_mode == SCROLL_KINETIC)
kinetic_force_stop();
scroll_mode = SCROLL_NONE;
hide_selection = false;
}
/*
* returns false if scrolling should be stopped entirely
*
* otherwise it returns true even if it didn't actually scroll,
* but scrolling mode shouldn't be changed
**/
static int scroll_begin_threshold;
static int threshold_accumulation;
static bool swipe_scroll(struct gui_synclist * gui_list, int difference)
{
/* fixme */
const enum screen_type screen = screens[SCREEN_MAIN].screen_type;
const int nb_lines = list_get_nb_lines(gui_list, screen);
const int line_height = gui_list->line_height[screen];
if (UNLIKELY(scroll_begin_threshold == 0))
scroll_begin_threshold = touchscreen_get_scroll_threshold();
/* make selecting items easier */
threshold_accumulation += abs(difference);
if (threshold_accumulation < scroll_begin_threshold && scroll_mode == SCROLL_NONE)
return false;
threshold_accumulation = 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 true;
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;
gui_list->start_item[screen] = old_start;
return scroll_mode != SCROLL_KINETIC; /* stop kinetic at the edges */
}
/* 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)
{
int selection_offset = gui_list->selected_item - old_start;
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;
/* keep selected item in sync */
gui_list->selected_item = new_start_item + selection_offset;
}
return true;
}
static int kinetic_callback(struct timeout *tmo)
{
/* cancel if screen was pressed */
if (scroll_mode != SCROLL_KINETIC)
return 0;
struct cb_data *data = (struct cb_data*)tmo->data;
/* ds = v*dt */
int pixel_diff = data->velocity * RELOAD_INTERVAL / HZ;
/* remember signedness to detect stopping */
int old_sign = SIGN(data->velocity);
/* advance the list */
if (!swipe_scroll(data->list, pixel_diff))
{
/* nothing to scroll? */
data->velocity = 0;
}
else
{
/* decelerate by a fixed amount
* decrementing v0 over time by the deceleration is
* equivalent to computing v = a*t + v0 */
data->velocity -= SIGN(data->velocity)*DECELERATION;
if (SIGN(data->velocity) != old_sign)
data->velocity = 0;
}
/* let get_action() timeout, which loads to a
* gui_synclist_draw() call from the main thread */
queue_post(&button_queue, BUTTON_REDRAW, 0);
/* stop if the velocity hit or crossed zero */
if (!data->velocity)
{
kinetic_stats_reset();
return 0;
}
return RELOAD_INTERVAL; /* cancel or reload */
}
/*
* computes the initial velocity v0 and sets up the timer */
static bool kinetic_setup_scroll(struct gui_synclist *list)
{
/* compute initial velocity */
int i, _i, v0, len = ARRAYLEN(kinetic_data);
for(i = 0, _i = 0, v0 = 0; i < len; i++)
{ /* in pixel/s */
if (kinetic_data[i].ticks > 0)
{
v0 += kinetic_data[i].difference*HZ/kinetic_data[i].ticks;
_i++;
}
}
if (_i > 0)
v0 /= _i;
else
v0 = 0;
if (v0 != 0)
{
cb_data.list = list;
cb_data.velocity = v0;
timeout_register(&kinetic_tmo, kinetic_callback, RELOAD_INTERVAL, (intptr_t)&cb_data);
return true;
}
return false;
}
#define OUTSIDE 0
#define TITLE_TEXT (1<<0)
#define TITLE_ICON (1<<1)
#define SCROLLBAR (1<<2)
#define LIST_TEXT (1<<3)
#define LIST_ICON (1<<4)
#define TITLE (TITLE_TEXT|TITLE_ICON)
#define LIST (LIST_TEXT|LIST_ICON)
static int get_click_location(struct gui_synclist *list, int x, int y)
{
int screen = SCREEN_MAIN;
struct viewport *parent, *title, *text;
int retval = OUTSIDE;
parent = list->parent[screen];
if (viewport_point_within_vp(parent, x, y))
{
/* see if the title was clicked */
title = &title_text[screen];
if (viewport_point_within_vp(title, x, y))
retval = TITLE_TEXT;
/* check the icon too */
if (list->title_icon != Icon_NOICON && global_settings.show_icons)
{
int width = list_icon_width(screen);
struct viewport vp = *title;
if (VP_IS_RTL(&vp))
vp.x += vp.width;
else
vp.x -= width;
vp.width = width;
if (viewport_point_within_vp(&vp, x, y))
retval = TITLE_ICON;
}
/* check scrollbar. assume it's shown, if it isn't it will be handled
* later */
if (retval == OUTSIDE)
{
bool on_scrollbar_clicked;
int adj_x = x - parent->x;
switch (global_settings.scrollbar)
{
case SCROLLBAR_LEFT:
on_scrollbar_clicked = adj_x <= SCROLLBAR_WIDTH; break;
case SCROLLBAR_RIGHT:
on_scrollbar_clicked = adj_x > (title->x + title->width - SCROLLBAR_WIDTH); break;
default:
on_scrollbar_clicked = false; break;
}
if (on_scrollbar_clicked)
retval = SCROLLBAR;
}
if (retval == OUTSIDE)
{
text = &list_text[screen];
if (viewport_point_within_vp(text, x, y))
retval = LIST_TEXT;
else /* if all fails, it must be on the list icons */
retval = LIST_ICON;
}
}
return retval;
}
unsigned gui_synclist_do_touchscreen(struct gui_synclist * list)
{
enum screen_type screen;
struct viewport *parent;
short x, y;
int action, adj_x, adj_y, line, line_height, list_start_item;
bool recurse;
static bool initial_touch = true;
static int last_y;
screen = SCREEN_MAIN;
parent = list->parent[screen];
line_height = list->line_height[screen];
list_start_item = list->start_item[screen];
/* start with getting the action code and finding the click location */
action = action_get_touchscreen_press(&x, &y);
adj_x = x - parent->x;
adj_y = y - parent->y;
/* some defaults before running the state machine */
recurse = false;
hide_selection = false;
switch (scroll_mode)
{
case SCROLL_NONE:
{
int click_loc;
if (initial_touch)
{
/* on the first touch last_y has to be reset to avoid
* glitches with touches from long ago */
last_y = adj_y;
initial_touch = false;
}
line = 0; /* silence gcc 'used uninitialized' warning */
click_loc = get_click_location(list, x, y);
if (click_loc & LIST)
{
if(!skinlist_get_item(&screens[screen], list, adj_x, adj_y, &line))
{
/* selection needs to be corrected if items are only partially visible */
line = (adj_y - y_offset) / line_height;
if (list_display_title(list, screen))
line -= 1; /* adjust for the list title */
}
if (line >= list->nb_items)
return ACTION_NONE;
list->selected_item = list_start_item+line;
gui_synclist_speak_item(list);
}
if (action == BUTTON_TOUCHSCREEN)
{
/* if not scrolling, the user is trying to select */
int diff = adj_y - last_y;
if ((click_loc & LIST) && swipe_scroll(list, diff))
scroll_mode = SCROLL_SWIPE;
else if (click_loc & SCROLLBAR)
scroll_mode = SCROLL_BAR;
}
else if (action == BUTTON_REPEAT)
{
if (click_loc & LIST)
{
/* held a single line for a while, bring up the context menu */
gui_synclist_select_item(list, list_start_item + line);
/* don't sent context repeatedly */
action_wait_for_release();
initial_touch = true;
return ACTION_STD_CONTEXT;
}
}
else if (action & BUTTON_REL)
{
initial_touch = true;
if (click_loc & LIST)
{ /* release on list item enters it */
gui_synclist_select_item(list, list_start_item + line);
return ACTION_STD_OK;
}
else if (click_loc & TITLE_TEXT)
{ /* clicking the title goes one level up (cancel) */
return ACTION_STD_CANCEL;
}
else if (click_loc & TITLE_ICON)
{ /* clicking the title icon goes back to the root */
return ACTION_STD_MENU;
}
}
break;
}
case SCROLL_SWIPE:
{
/* when swipe scrolling, we accept outside presses as well and
* grab the entire screen (i.e. click_loc does not matter) */
int diff = adj_y - last_y;
hide_selection = true;
kinetic_stats_collect(diff);
if (swipe_scroll(list, diff))
{
/* letting the pen go enters kinetic scrolling */
if ((action & BUTTON_REL))
{
if (kinetic_setup_scroll(list))
{
hide_selection = true;
scroll_mode = SCROLL_KINETIC;
}
else
scroll_mode = SCROLL_NONE;
}
}
else if (action & BUTTON_REL)
scroll_mode = SCROLL_NONE;
if (scroll_mode == SCROLL_NONE)
initial_touch = true;
break;
}
case SCROLL_KINETIC:
{
/* during kinetic scrolling we need to handle cancellation.
* This state is actually only entered upon end of it as this
* function is not called during the animation. */
if (!is_kinetic_over())
{ /* a) the user touched the screen (manual cancellation) */
kinetic_force_stop();
if (get_click_location(list, x, y) & SCROLLBAR)
scroll_mode = SCROLL_BAR;
else
scroll_mode = SCROLL_SWIPE;
}
else
{ /* b) kinetic scrolling stopped on its own */
/* need to re-run this with SCROLL_NONE since otherwise
* the next touch is not detected correctly */
scroll_mode = SCROLL_NONE;
recurse = true;
}
break;
}
case SCROLL_BAR:
{
hide_selection = true;
/* similarly to swipe scroll, using the scrollbar grabs
* focus so the click location is irrelevant */
scrollbar_scroll(list, adj_y);
if (action & BUTTON_REL)
scroll_mode = SCROLL_NONE;
break;
}
}
/* register y position unless forcefully reset */
if (!initial_touch)
last_y = adj_y;
return recurse ? gui_synclist_do_touchscreen(list) : ACTION_REDRAW;
}
#endif
Reference in a new issue View git blame Copy permalink