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//
// "$Id$"
//
// Valuator widget for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2005 by Bill Spitzak and others.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA.
//
// Please report all bugs and problems to "fltk-bugs@fltk.org".
//
// Base class for sliders and all other one-value "knobs"
#include <FL/Fl.H>
#include <FL/Fl_Valuator.H>
#include <FL/math.h>
#include <stdio.h>
#include "flstring.h"
Fl_Valuator::Fl_Valuator(int X, int Y, int W, int H, const char* L)
: Fl_Widget(X,Y,W,H,L) {
align(FL_ALIGN_BOTTOM);
when(FL_WHEN_CHANGED);
value_ = 0;
min = 0;
max = 1;
A = 0.0;
B = 1;
}
const double epsilon = 4.66e-10;
void Fl_Valuator::step(double s) {
if (s < 0) s = -s;
A = rint(s);
B = 1;
while (fabs(s-A/B) > epsilon && B<=(0x7fffffff/10)) {B *= 10; A = rint(s*B);}
}
void Fl_Valuator::precision(int p) {
A = 1.0;
for (B = 1; p--;) B *= 10;
}
void Fl_Valuator::value_damage() {damage(FL_DAMAGE_EXPOSE);} // by default do partial-redraw
int Fl_Valuator::value(double v) {
clear_changed();
if (v == value_) return 0;
value_ = v;
value_damage();
return 1;
}
double Fl_Valuator::softclamp(double v) {
int which = (min<=max);
double p = previous_value_;
if ((v<min)==which && p!=min && (p<min)!=which) return min;
else if ((v>max)==which && p!=max && (p>max)!=which) return max;
else return v;
}
// inline void Fl_Valuator::handle_push() {previous_value_ = value_;}
void Fl_Valuator::handle_drag(double v) {
if (v != value_) {
value_ = v;
value_damage();
set_changed();
if (when() & FL_WHEN_CHANGED) do_callback();
}
}
void Fl_Valuator::handle_release() {
if (when()&FL_WHEN_RELEASE) {
// insure changed() is off even if no callback is done. It may have
// been turned on by the drag, and then the slider returned to it's
// initial position:
clear_changed();
// now do the callback only if slider in new position or always is on:
if (value_ != previous_value_ || when() & FL_WHEN_NOT_CHANGED) {
do_callback();
}
}
}
double Fl_Valuator::round(double v) {
if (A) return rint(v*B/A)*A/B;
else return v;
}
double Fl_Valuator::clamp(double v) {
if ((v<min)==(min<=max)) return min;
else if ((v>max)==(min<=max)) return max;
else return v;
}
double Fl_Valuator::increment(double v, int n) {
if (!A) return v+n*(max-min)/100;
if (min > max) n = -n;
return (rint(v*B/A)+n)*A/B;
}
int Fl_Valuator::format(char* buffer) {
double v = value();
// MRS: THIS IS A HACK - RECOMMEND ADDING BUFFER SIZE ARGUMENT
if (!A) return snprintf(buffer, 128, "%g", v);
int i, X;
double ba = B / A;
for (X = 1, i = 0; X < ba; X *= 10) i++;
return sprintf(buffer, "%.*f", i, v);
}
//
// End of "$Id$".
//
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