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rockbox/apps/gui/bitmap/list.c
Maurus Cuelenaere 9ec0c1669c Touchscreen: fix scrollbar handling when it's on the right 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24635 a1c6a512-1295-4272-9138-f99709370657
2010-02-13 15:53:10 +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 "sprintf.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"
#define ICON_PADDING 1
/* these are static to make scrolling work */
static struct viewport list_text[NB_SCREENS], title_text[NB_SCREENS];
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];
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);
/* draw the scrollbar if its needed */
if (global_settings.scrollbar &&
viewport_get_nb_lines(list_text_vp) < list->nb_items)
{
struct viewport vp;
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;
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
if(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_offset(0, i-start, entry_name,
style, item_offset);
}
else
{
display->puts_scroll_style_offset(0, i-start, entry_name,
style, item_offset);
}
}
else
{
if (list->scroll_all)
display->puts_scroll_style_offset(0, i-start, entry_name,
style, item_offset);
else
display->puts_style_offset(0, i-start, entry_name,
style, item_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,
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);
}
}
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 scrolling=false;
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)
{
scrolling = true;
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;
gui_synclist_select_item(gui_list, new_selection);
return ACTION_REDRAW;
}
return ACTION_NONE;
}
unsigned gui_synclist_do_touchscreen(struct gui_synclist * gui_list)
{
short x, y;
const int button = action_get_touchscreen_press(&x, &y);
int line;
const struct screen *display = &screens[SCREEN_MAIN];
const int screen = display->screen_type;
const int list_start_item = gui_list->start_item[screen];
const struct viewport *list_text_vp = &list_text[screen];
if (button == BUTTON_NONE)
return ACTION_NONE;
if (x > list_text_vp->x + list_text_vp->width)
{
if (global_settings.scrollbar == SCROLLBAR_RIGHT &&
x > list_text_vp->x + list_text_vp->width + SCROLLBAR_WIDTH)
{
/* wider than the list's viewport, ignore it */
return ACTION_NONE;
}
}
if (x < list_text_vp->x)
{
/* Top left corner is GO_TO_ROOT */
if (y<list_text[SCREEN_MAIN].y)
{
if (button == BUTTON_REL)
return ACTION_STD_MENU;
else if (button == (BUTTON_REPEAT|BUTTON_REL))
return ACTION_STD_CONTEXT;
else
return ACTION_NONE;
}
/* Scroll bar */
else if(global_settings.scrollbar == SCROLLBAR_LEFT)
return gui_synclist_touchscreen_scrollbar(gui_list, y);
}
else
{
if (x > list_text_vp->x + list_text_vp->width &&
global_settings.scrollbar == SCROLLBAR_RIGHT)
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 (y > list_text_vp->y || button & BUTTON_REPEAT)
{
int line_height, actual_y;
actual_y = y - list_text_vp->y;
line_height = font_get(gui_list->parent[screen]->font)->height;
line = actual_y / line_height;
/* Pressed below the list*/
if (list_start_item + line >= gui_list->nb_items)
return ACTION_NONE;
/* Pressed a border */
if(UNLIKELY(actual_y % line_height == 0))
return ACTION_NONE;
if (line != (gui_list->selected_item - list_start_item)
&& button ^ BUTTON_REL)
{
if(button & BUTTON_REPEAT)
scrolling = true;
gui_synclist_select_item(gui_list, list_start_item + line);
return ACTION_REDRAW;
}
/* This has the same effect as the icons do when the scrollbar
is on the left (ie eliminate the chances an user enters/starts
an item when he wanted to use the scrollbar, due to touchscreen
dead zones)
*/
if(global_settings.scrollbar == SCROLLBAR_RIGHT &&
x > list_text_vp->x + list_text_vp->width -
get_icon_width(SCREEN_MAIN))
return ACTION_NONE;
if (button == (BUTTON_REPEAT|BUTTON_REL))
{
if(!scrolling)
{
/* Pen was hold on the same line as the
* previously selected one
* => simulate long button press
*/
return ACTION_STD_CONTEXT;
}
else
{
/* Pen was moved across several lines and then released on
* this one
* => do nothing
*/
scrolling = false;
return ACTION_NONE;
}
}
else if(button == BUTTON_REL &&
line == gui_list->selected_item - list_start_item)
{
/* Pen was released on either the same line as the previously
* selected one or an other one
* => simulate short press
*/
return ACTION_STD_OK;
}
else
return ACTION_NONE;
}
/* Everything above the items is cancel */
else if (y < list_text_vp->y && button == BUTTON_REL)
return ACTION_STD_CANCEL;
}
return ACTION_NONE;
}
#endif
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