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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. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* \file valuator.c
*
* 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
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "include/forms.h"
#include "flinternal.h"
#include "private/pvaluator.h"
/***************************************
***************************************/
void *
fli_init_valuator( FL_OBJECT * ob )
{
FLI_VALUATOR_SPEC *sp = ob->spec;
if ( ! sp )
ob->spec = sp = fl_calloc( 1, 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
fli_valuator_round_and_clamp( FL_OBJECT * ob,
double val )
{
FLI_VALUATOR_SPEC *sp = ob->spec;
double vmin,
vmax;
if ( sp->step != 0.0 )
{
val /= sp->step;
val = sp->step * ( val >= 0 ? floor( val + 0.5 ) : ceil( val - 0.5 ) );
}
vmin = FL_min( sp->min, sp->max );
vmax = FL_max( sp->min, sp->max );
if ( ! sp->cross_over )
return FL_clamp( val, vmin, vmax );
else
return CROSS_OVER( val, vmin, vmax );
}
/***************************************
***************************************/
int
fli_valuator_handle_drag( FL_OBJECT * ob,
double value )
{
FLI_VALUATOR_SPEC *sp = ob->spec;
int ret = FL_RETURN_NONE;
value = fli_valuator_round_and_clamp( ob, value );
if ( value != sp->val )
{
sp->val = value;
sp->draw_type = VALUE_DRAW;
fl_redraw_object( ob );
ret |= FL_RETURN_CHANGED;
}
return ret;
}
/***************************************
***************************************/
int
fli_valuator_handle_release( FL_OBJECT * ob,
double value )
{
FLI_VALUATOR_SPEC *sp = ob->spec;
int ret = FL_RETURN_END;
value = fli_valuator_round_and_clamp( ob, value );
if ( value != sp->val )
{
sp->val = value;
sp->draw_type = VALUE_DRAW;
fl_redraw_object( ob );
if ( ! ( ob->how_return & FL_RETURN_END_CHANGED ) )
ret |= FL_RETURN_CHANGED;
}
if ( sp->start_val != sp->val && ob->how_return & FL_RETURN_END_CHANGED )
ret |= FL_RETURN_CHANGED;
return ret;
}
/***************************************
***************************************/
double
fli_clamp( double val,
double min,
double max)
{
double vmin = FL_min( min, max ),
vmax = FL_max( min, max );
return FL_clamp( val, vmin, vmax );
}
/*
* Local variables:
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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