Logo Search packages:      
Sourcecode: blender version File versions

ScrollBar.c

/**
 * $Id: ScrollBar.c,v 1.3 2002/11/25 09:53:00 mein Exp $
 * ***** 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>

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "MEM_guardedalloc.h"

#include "Basic.h"
#include "ScrollBar.h"

00045 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);
}

Generated by  Doxygen 1.6.0   Back to index