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rockbox/apps/gui/bitmap/list.c
Aidan MacDonald cdd1f90131 touchscreen: Respect list item selection size 
Some lists have tall items that span more than one line of text,
eg. the bookmark menu or ID3 tag menu. The touchscreen code didn't
handle these menus correctly and touching on the lower part of a
list item could select "between" two items, leading to incorrect
rendering and behavior due to callers relying on the selected item
being properly aligned to the selection size. Fix this by ensuring
the touch code only generates properly aligned selections.

Change-Id: I73945bb0947590517a005754bd447639e22812e2
2021-08-10 23:33:00 +01:00

856 lines
28 KiB
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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 "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;
struct viewport *last = 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);
display->set_viewport(last);
}
/* 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;
if(gui_list->selected_size > 1)
gui_list->selected_item -= (gui_list->selected_item % gui_list->selected_size);
}
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 (list_start_item+line >= list->nb_items)
return ACTION_NONE;
list->selected_item = list_start_item+line;
if(list->selected_size > 1)
list->selected_item -= (list->selected_item % list->selected_size);
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->selected_item);
/* 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->selected_item);
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
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