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/**
* $Id$
* ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
*
* 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. The Blender
* Foundation also sells licenses for use in proprietary software under
* the Blender License. See http://www.blender.org/BL/ for information
* about this.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): none yet.
*
* ***** END GPL/BL DUAL LICENSE BLOCK *****
*/
#include <stdlib.h>
#include <math.h>
#include "MEM_guardedalloc.h"
#include "Basic.h"
#include "ScrollBar.h"
struct _ScrollBar {
int rect[2][2];
float thumbpos, thumbpct;
int inset;
int minthumb;
int scrolling;
float scrolloffs;
};
static int scrollbar_get_thumbH(ScrollBar *sb) {
int scrollable_h= rect_height(sb->rect) - 2*sb->inset;
return clamp_i(sb->thumbpct*scrollable_h, sb->minthumb, scrollable_h);
}
static int scrollbar_get_thumbableH(ScrollBar *sb) {
int scrollable_h= rect_height(sb->rect) - 2*sb->inset;
int thumb_h= scrollbar_get_thumbH(sb);
return scrollable_h - thumb_h;
}
static float scrollbar_co_to_pos(ScrollBar *sb, int yco) {
int thumb_h= scrollbar_get_thumbH(sb);
int thumbable_h= scrollbar_get_thumbableH(sb);
int thumbable_y= (sb->rect[0][1]+sb->inset) + thumb_h/2;
return (float) (yco-thumbable_y)/thumbable_h;
}
/**/
ScrollBar *scrollbar_new(int inset, int minthumb) {
ScrollBar *sb= MEM_callocN(sizeof(*sb), "scrollbar_new");
sb->inset= inset;
sb->minthumb= minthumb;
return sb;
}
void scrollbar_get_thumb(ScrollBar *sb, int thumb_r[2][2]) {
int thumb_h= scrollbar_get_thumbH(sb);
int thumbable_h= scrollbar_get_thumbableH(sb);
thumb_r[0][0]= sb->rect[0][0]+sb->inset;
thumb_r[1][0]= sb->rect[1][0]-sb->inset;
thumb_r[0][1]= sb->rect[0][1]+sb->inset + sb->thumbpos*thumbable_h;
thumb_r[1][1]= thumb_r[0][1] + thumb_h;
}
int scrollbar_is_scrolling(ScrollBar *sb) {
return sb->scrolling;
}
int scrollbar_contains_pt(ScrollBar *sb, int pt[2]) {
return rect_contains_pt(sb->rect, pt);
}
void scrollbar_start_scrolling(ScrollBar *sb, int yco) {
int thumb_h_2= scrollbar_get_thumbH(sb)/2;
int thumbable_h= scrollbar_get_thumbableH(sb);
float npos= scrollbar_co_to_pos(sb, yco);
sb->scrolloffs= sb->thumbpos - npos;
if (fabs(sb->scrolloffs) >= (float) thumb_h_2/thumbable_h) {
sb->scrolloffs= 0.0;
}
sb->scrolling= 1;
sb->thumbpos= clamp_f(npos + sb->scrolloffs, 0.0, 1.0);
}
void scrollbar_keep_scrolling(ScrollBar *sb, int yco) {
float npos= scrollbar_co_to_pos(sb, yco);
sb->thumbpos= clamp_f(npos + sb->scrolloffs, 0.0, 1.0);
}
void scrollbar_stop_scrolling(ScrollBar *sb) {
sb->scrolling= 0;
sb->scrolloffs= 0.0;
}
void scrollbar_set_thumbpct(ScrollBar *sb, float pct) {
sb->thumbpct= pct;
}
void scrollbar_set_thumbpos(ScrollBar *sb, float pos) {
sb->thumbpos= clamp_f(pos, 0.0, 1.0);
}
void scrollbar_set_rect(ScrollBar *sb, int rect[2][2]) {
rect_copy(sb->rect, rect);
}
float scrollbar_get_thumbpct(ScrollBar *sb) {
return sb->thumbpct;
}
float scrollbar_get_thumbpos(ScrollBar *sb) {
return sb->thumbpos;
}
void scrollbar_get_rect(ScrollBar *sb, int rect_r[2][2]) {
rect_copy(rect_r, sb->rect);
}
void scrollbar_free(ScrollBar *sb) {
MEM_freeN(sb);
}
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