[fltk.general] single callback for multiple instances

[Jonathan Murphy]

Hi Folks, 

I'm new to fltk, also to c++. I'm trying to make a callback that will
work for all instances of a float input, not just the last one. I'm
trying to put together ideas from the manual, Erco's cheat page and
Robert Arkiletian's tutorial, but I'm at a loss as to how to get it
working. Any assistance would be very much appreciated. The code that
doesn't do what I want it to is below. What I would like is a single
callback that will put the value of each input into output.

Thanks in advance,
Jonathan.

#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Scroll.H>
#include <FL/Fl_Output.H>
#include <FL/Fl_Float_Input.H>

#define COLS 8
#define ROWS 16

class Table : public Fl_Scroll 
{
public:
  Table(int X, int Y, int W, int H, const char*L);
  ~Table();
  Fl_Float_Input *in;
  int r, c;
private:
  static void in_cb(Fl_Widget*, void*);
  inline void in_cb_i();
};

Fl_Double_Window *win;
Fl_Output *out;
Table::Table *table;

Table::Table(int X, int Y, int W, int H, const char*L) : Fl_Scroll(X,Y,W,H,L) 
{  
  int cellw = 60;
  int cellh = 20;
  int xx = X, yy = Y;
  for (r=0; r<ROWS; r++ ) 
    {
      for (c=0; c<COLS; c++ ) 
        {
          {
            in = new Fl_Float_Input(xx,yy,cellw,cellh);
            in->box(FL_PLASTIC_UP_BOX);
            in->value("0.00");
          }
          xx += cellw;
        }
      xx = X;
      yy += cellh;
    }
  in->callback(in_cb, this);

  end();
}

Table::~Table(){}

void Table::in_cb(Fl_Widget* o, void* v) 
{
  ((Table*)v)->in_cb_i();
}

void Table::in_cb_i() 
{
  out->value(in->value()); 
}

int main() 
{
  Fl::scheme("plastic");
  win = new Fl_Double_Window(480, 380);
  table = new Table(0, 0, 480, 320, "");
  out = new Fl_Output(200, 340, 80, 20, "");
  win->resizable();
  win->show();
  return(Fl::run());
}
 

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