Fl_Spinner.H

//
// "$Id: Fl_Spinner.H 8339 2011-01-30 12:50:19Z ianmacarthur $"
//
// Spinner widget for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2010 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
//
 
/* \file
   Fl_Spinner widget . */
 
#ifndef Fl_Spinner_H
#  define Fl_Spinner_H
 
//
// Include necessary headers...
//
 
#  include <FL/Enumerations.H>
#  include <FL/Fl_Group.H>
#  include <FL/Fl_Input.H>
#  include <FL/Fl_Repeat_Button.H>
#  include <stdio.h>
#  include <stdlib.h>
 
 
class FL_EXPORT Fl_Spinner : public Fl_Group {
  
  double        value_;                 // Current value
  double        minimum_;               // Minimum value
  double        maximum_;               // Maximum value
  double        step_;                  // Amount to add/subtract for up/down
  const char    *format_;               // Format string
 
  Fl_Input      input_;                 // Input field for the value
  Fl_Repeat_Button
                up_button_,             // Up button
                down_button_;           // Down button
 
 
  static void   sb_cb(Fl_Widget *w, Fl_Spinner *sb) {
                  double v;             // New value
 
                  if (w == &(sb->input_)) {
                    // Something changed in the input field...
                    v = atof(sb->input_.value());
 
                    if (v < sb->minimum_) {
                      sb->value_ = sb->minimum_;
                      sb->update();
                    } else if (v > sb->maximum_) {
                      sb->value_ = sb->maximum_;
                      sb->update();
                    } else sb->value_ = v;
                  } else if (w == &(sb->up_button_)) {
                    // Up button pressed...
                    v = sb->value_ + sb->step_;
 
                    if (v > sb->maximum_) sb->value_ = sb->minimum_;
                    else sb->value_ = v;
 
                    sb->update();
                  } else if (w == &(sb->down_button_)) {
                    // Down button pressed...
                    v = sb->value_ - sb->step_;
 
                    if (v < sb->minimum_) sb->value_ = sb->maximum_;
                    else sb->value_ = v;
 
                    sb->update();
                  }
 
                  sb->do_callback();
                }
  void          update() {
                  char s[255];          // Value string
 
                  if (format_[0]=='%'&&format_[1]=='.'&&format_[2]=='*') {  // precision argument
                    // this code block is a simplified version of
                    // Fl_Valuator::format() and works well (but looks ugly)
                    int c = 0;
                    char temp[64], *sp = temp;
                    sprintf(temp, "%.12f", step_);
                    while (*sp) sp++;
                    sp--;
                    while (sp>temp && *sp=='0') sp--;
                    while (sp>temp && (*sp>='0' && *sp<='9')) { sp--; c++; }
                    sprintf(s, format_, c, value_);
                  } else {
                    sprintf(s, format_, value_);
                  }
                  input_.value(s);
                }
 
  public:
 
                Fl_Spinner(int X, int Y, int W, int H, const char *L = 0)
                  : Fl_Group(X, Y, W, H, L),
                    input_(X, Y, W - H / 2 - 2, H),
                    up_button_(X + W - H / 2 - 2, Y, H / 2 + 2, H / 2, "@-42<"),
                    down_button_(X + W - H / 2 - 2, Y + H - H / 2,
                                 H / 2 + 2, H / 2, "@-42>") {
                  end();
 
                  value_   = 1.0;
                  minimum_ = 1.0;
                  maximum_ = 100.0;
                  step_    = 1.0;
                  format_  = "%g";
 
                  align(FL_ALIGN_LEFT);
 
                  input_.value("1");
                  input_.type(FL_INT_INPUT);
                  input_.when(FL_WHEN_ENTER_KEY | FL_WHEN_RELEASE);
                  input_.callback((Fl_Callback *)sb_cb, this);
 
                  up_button_.callback((Fl_Callback *)sb_cb, this);
 
                  down_button_.callback((Fl_Callback *)sb_cb, this);
                }
 
  const char    *format() { return (format_); }
  void          format(const char *f) { format_ = f; update(); }
 
  int           handle(int event) {
                  switch (event) {
                    case FL_KEYDOWN :
                    case FL_SHORTCUT :
                      if (Fl::event_key() == FL_Up) {
                        up_button_.do_callback();
                        return 1;
                      } else if (Fl::event_key() == FL_Down) {
                        down_button_.do_callback();
                        return 1;
                      } else return 0;
 
                    case FL_FOCUS :
                      if (input_.take_focus()) return 1;
                      else return 0;
                  }
 
                  return Fl_Group::handle(event);
                }
 
  double        maxinum() const { return (maximum_); }
  double        maximum() const { return (maximum_); }
  void          maximum(double m) { maximum_ = m; }
  double        mininum() const { return (minimum_); }
  double        minimum() const { return (minimum_); }
  void          minimum(double m) { minimum_ = m; }
  void          range(double a, double b) { minimum_ = a; maximum_ = b; }
  void          resize(int X, int Y, int W, int H) {
                  Fl_Group::resize(X,Y,W,H);
 
                  input_.resize(X, Y, W - H / 2 - 2, H);
                  up_button_.resize(X + W - H / 2 - 2, Y, H / 2 + 2, H / 2);
                  down_button_.resize(X + W - H / 2 - 2, Y + H - H / 2,
                                      H / 2 + 2, H / 2);
                }
  double        step() const { return (step_); }
  void          step(double s) {
                  step_ = s;
                  if (step_ != (int)step_) input_.type(FL_FLOAT_INPUT);
                  else input_.type(FL_INT_INPUT);
                  update();
                }
  Fl_Color      textcolor() const {
                  return (input_.textcolor());
                }
  void          textcolor(Fl_Color c) {
                  input_.textcolor(c);
                }
  Fl_Font       textfont() const {
                  return (input_.textfont());
                }
  void          textfont(Fl_Font f) {
                  input_.textfont(f);
                }
  Fl_Fontsize  textsize() const {
                  return (input_.textsize());
                }
  void          textsize(Fl_Fontsize s) {
                  input_.textsize(s);
                }
  uchar         type() const { return (input_.type()); }
  void          type(uchar v) { 
                  if (v==FL_FLOAT_INPUT) {
                    format("%.*f");
                  } else {
                    format("%.0f");
                  }
                  input_.type(v); 
                }
  double        value() const { return (value_); }
  void          value(double v) { value_ = v; update(); }
};
 
#endif // !Fl_Spinner_H
 
//
// End of "$Id: Fl_Spinner.H 8339 2011-01-30 12:50:19Z ianmacarthur $".
//