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//
// "$Id: Fl_Valuator.H 4288 2005-04-16 00:13:17Z mike $"
//
// Valuator header file 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 on the following page:
//
//     http://www.fltk.org/str.php
//

#ifndef Fl_Valuator_H
#define Fl_Valuator_H

#ifndef Fl_Widget_H
#include "Fl_Widget.H"
#endif

// shared type() values for classes that work in both directions:
#define FL_VERTICAL		0
#define FL_HORIZONTAL		1

class FL_EXPORT Fl_Valuator : public Fl_Widget {

  double value_;
  double previous_value_;
  double min, max; // truncates to this range *after* rounding
  double A; int B; // rounds to multiples of A/B, or no rounding if A is zero

protected:

  int horizontal() const {return type()&1;}
  Fl_Valuator(int X, int Y, int W, int H, const char* L);

  double previous_value() const {return previous_value_;}
  void handle_push() {previous_value_ = value_;}
  double softclamp(double);
  void handle_drag(double newvalue);
  void handle_release(); // use drag() value
  virtual void value_damage(); // cause damage() due to value() changing
  void set_value(double v) {value_ = v;}

public:

  void bounds(double a, double b) {min=a; max=b;}
  double minimum() const {return min;}
  void minimum(double a) {min = a;}
  double maximum() const {return max;}
  void maximum(double a) {max = a;}
  void range(double a, double b) {min = a; max = b;}
  void step(int a) {A = a; B = 1;}
  void step(double a, int b) {A = a; B = b;}
  void step(double s);
  double step() const {return A/B;}
  void precision(int);

  double value() const {return value_;}
  int value(double);

  virtual int format(char*);
  double round(double); // round to nearest multiple of step
  double clamp(double); // keep in range
  double increment(double, int); // add n*step to value
};

#endif

//
// End of "$Id: Fl_Valuator.H 4288 2005-04-16 00:13:17Z mike $".
//