forked from bartvdbraak/blender
160 lines
3.7 KiB
C
160 lines
3.7 KiB
C
/**
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
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* All rights reserved.
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*
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* The Original Code is: all of this file.
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*
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* Contributor(s): none yet.
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*
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* ***** END GPL LICENSE BLOCK *****
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*/
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#include <stdlib.h>
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#include <math.h>
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#include "MEM_guardedalloc.h"
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#include "Basic.h"
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#include "ScrollBar.h"
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struct _ScrollBar {
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int rect[2][2];
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float thumbpos, thumbpct;
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int inset;
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int minthumb;
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int scrolling;
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float scrolloffs;
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};
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static int scrollbar_get_thumbH(ScrollBar *sb)
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{
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int scrollable_h = rect_height(sb->rect) - 2 * sb->inset;
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return clamp_i(sb->thumbpct * scrollable_h, sb->minthumb, scrollable_h);
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}
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static int scrollbar_get_thumbableH(ScrollBar *sb)
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{
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int scrollable_h = rect_height(sb->rect) - 2 * sb->inset;
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int thumb_h = scrollbar_get_thumbH(sb);
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return scrollable_h - thumb_h;
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}
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static float scrollbar_co_to_pos(ScrollBar *sb, int yco)
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{
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int thumb_h = scrollbar_get_thumbH(sb);
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int thumbable_h = scrollbar_get_thumbableH(sb);
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int thumbable_y = (sb->rect[0][1] + sb->inset) + thumb_h / 2;
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return (float) (yco - thumbable_y) / thumbable_h;
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}
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/**/
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ScrollBar *scrollbar_new(int inset, int minthumb)
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{
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ScrollBar *sb = MEM_callocN(sizeof(*sb), "scrollbar_new");
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sb->inset = inset;
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sb->minthumb = minthumb;
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return sb;
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}
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void scrollbar_get_thumb(ScrollBar *sb, int thumb_r[2][2])
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{
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int thumb_h = scrollbar_get_thumbH(sb);
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int thumbable_h = scrollbar_get_thumbableH(sb);
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thumb_r[0][0] = sb->rect[0][0] + sb->inset;
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thumb_r[1][0] = sb->rect[1][0] - sb->inset;
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thumb_r[0][1] = sb->rect[0][1] + sb->inset + sb->thumbpos * thumbable_h;
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thumb_r[1][1] = thumb_r[0][1] + thumb_h;
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}
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int scrollbar_is_scrolling(ScrollBar *sb)
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{
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return sb->scrolling;
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}
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int scrollbar_contains_pt(ScrollBar *sb, int pt[2])
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{
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return rect_contains_pt(sb->rect, pt);
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}
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void scrollbar_start_scrolling(ScrollBar *sb, int yco)
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{
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int thumb_h_2 = scrollbar_get_thumbH(sb) / 2;
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int thumbable_h = scrollbar_get_thumbableH(sb);
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float npos = scrollbar_co_to_pos(sb, yco);
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sb->scrolloffs = sb->thumbpos - npos;
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if (fabs(sb->scrolloffs) >= (float) thumb_h_2 / thumbable_h) {
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sb->scrolloffs = 0.0;
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}
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sb->scrolling = 1;
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sb->thumbpos = clamp_f(npos + sb->scrolloffs, 0.0, 1.0);
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}
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void scrollbar_keep_scrolling(ScrollBar *sb, int yco)
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{
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float npos = scrollbar_co_to_pos(sb, yco);
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sb->thumbpos = clamp_f(npos + sb->scrolloffs, 0.0, 1.0);
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}
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void scrollbar_stop_scrolling(ScrollBar *sb)
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{
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sb->scrolling = 0;
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sb->scrolloffs = 0.0;
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}
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void scrollbar_set_thumbpct(ScrollBar *sb, float pct)
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{
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sb->thumbpct = pct;
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}
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void scrollbar_set_thumbpos(ScrollBar *sb, float pos)
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{
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sb->thumbpos = clamp_f(pos, 0.0, 1.0);
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}
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void scrollbar_set_rect(ScrollBar *sb, int rect[2][2])
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{
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rect_copy(sb->rect, rect);
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}
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float scrollbar_get_thumbpct(ScrollBar *sb)
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{
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return sb->thumbpct;
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}
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float scrollbar_get_thumbpos(ScrollBar *sb)
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{
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return sb->thumbpos;
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}
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void scrollbar_get_rect(ScrollBar *sb, int rect_r[2][2])
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{
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rect_copy(rect_r, sb->rect);
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}
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void scrollbar_free(ScrollBar *sb)
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{
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MEM_freeN(sb);
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}
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