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/*
*
* This file is part of the XForms library package.
*
* XForms is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1, or
* (at your option) any later version.
*
* XForms 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with XForms; see the file COPYING. If not, write to
* the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*
*/
/*
* $Id: valuator.c,v 1.0 2002/05/08 05:16:30 zhao Release $
*
* This file is part of the XForms library package.
* Copyright (c) 1998-2002 T.C. Zhao
* All rights reserved.
*
*
* Handle some common valuator tasks.
* TODO: move slider and counter handler here
*/
#include "forms.h"
#include "pvaluator.h"
void *
fl_init_valuator(FL_OBJECT * ob)
{
FL_VALUATOR_SPEC *sp = ob->spec;
if (!sp)
sp = ob->spec = fl_calloc(1, ob->spec_size = sizeof(*sp));
sp->min = 0.0;
sp->max = 1.0;
sp->val = 0.5;
sp->prec = 2;
sp->step = 0.01;
sp->draw_type = COMPLETE_DRAW;
return sp;
}
#define CROSS_OVER(v,vmin,vmax) ((v)<(vmin)?(vmax):((v)>(vmax)?(vmin):(v)))
double
fl_valuator_round_and_clamp(FL_OBJECT * ob, double value)
{
FL_VALUATOR_SPEC *sp = ob->spec;
double vmin, vmax;
if (sp->step != 0.0)
{
float f = value / sp->step;
value = sp->step * (int) (f > 0 ? (f + 0.4) : (f - 0.4));
}
vmin = FL_min(sp->min, sp->max);
vmax = FL_max(sp->min, sp->max);
if(!sp->cross_over)
return FL_clamp(value, vmin, vmax);
else
return CROSS_OVER(value,vmin,vmax);
}
int
fl_valuator_handle_drag(FL_OBJECT * ob, double value)
{
FL_VALUATOR_SPEC *sp = ob->spec;
value = fl_valuator_round_and_clamp(ob, value);
if (value != sp->val)
{
sp->val = value;
sp->draw_type = VALUE_DRAW;
fl_redraw_object(ob);
return (sp->how_return == FL_RETURN_CHANGED ||
sp->how_return == FL_RETURN_ALWAYS);
}
return (sp->how_return == FL_RETURN_ALWAYS);
}
int
fl_valuator_handle_release(FL_OBJECT * ob, double value)
{
FL_VALUATOR_SPEC *sp = ob->spec;
value = fl_valuator_round_and_clamp(ob, value);
if (value != sp->val)
{
sp->val = value;
sp->draw_type = VALUE_DRAW;
fl_redraw_object(ob);
if (sp->how_return == FL_RETURN_CHANGED)
return 1;
}
if (sp->start_val != sp->val && (sp->how_return == FL_RETURN_END_CHANGED))
return 1;
return (sp->how_return == FL_RETURN_ALWAYS ||
sp->how_return == FL_RETURN_END);
}
int
fl_set_valuator_return(FL_OBJECT * ob, int n)
{
FL_VALUATOR_SPEC *sp = ob->spec;
int old = sp->how_return;
sp->how_return = n;
return old;
}
double
fl_clamp(double val, double min, double max)
{
double vmin = FL_min(min, max), vmax = FL_max(min, max);
return FL_clamp(val, vmin, vmax);
}
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