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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) Markus Braun (2002)
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "scrollbar.h"
#ifdef HAVE_LCD_BITMAP
#include "config.h"
#include "limits.h"
void gui_scrollbar_draw(struct screen * screen, int x, int y,
int width, int height, int items,
int min_shown, int max_shown,
enum orientation orientation)
{
int min;
int max;
int inner_len;
int start;
int size;
/* draw box */
screen->drawrect(x, y, width, height);
screen->set_drawmode(DRMODE_SOLID|DRMODE_INVERSEVID);
/* clear edge pixels */
screen->drawpixel(x, y);
screen->drawpixel((x + width - 1), y);
screen->drawpixel(x, (y + height - 1));
screen->drawpixel((x + width - 1), (y + height - 1));
/* clear pixels in progress bar */
screen->fillrect(x + 1, y + 1, width - 2, height - 2);
/* min should be min */
if(min_shown < max_shown) {
min = min_shown;
max = max_shown;
}
else {
min = max_shown;
max = min_shown;
}
/* limit min and max */
if(min < 0)
min = 0;
if(min > items)
min = items;
if(max < 0)
max = 0;
if(max > items)
max = items;
if (orientation == VERTICAL)
inner_len = height - 2;
else
inner_len = width - 2;
/* avoid overflows */
while (items > (INT_MAX / inner_len)) {
items >>= 1;
min >>= 1;
max >>= 1;
}
/* calc start and end of the knob */
if (items > 0 && items > (max - min)) {
size = inner_len * (max - min) / items;
if (size == 0) { /* width of knob is null */
size = 1;
start = (inner_len - 1) * min / items;
} else {
start = (inner_len - size) * min / (items - (max - min));
}
} else { /* if null draw full bar */
size = inner_len;
start = 0;
}
screen->set_drawmode(DRMODE_SOLID);
if(orientation == VERTICAL)
screen->fillrect(x + 1, y + start + 1, width - 2, size);
else
screen->fillrect(x + start + 1, y + 1, size, height - 2);
}
#endif /* HAVE_LCD_BITMAP */
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