Re: [fltk.general] Fl_Check_Browser callback does not get called. - Forums

On 6/13/21 6:17 PM aditya...@gmail.com wrote:

Hi,
It seems like `Fl_Check_Browser`'s callback doesn't get called when items are selected and deselected. I tried the example program compiled with the last FLTK commit (#986a8b33a2b5e503dd36ddbc8283d489ebbd9290) below with both keyboard and mouse input:

This is correct although AFAICT undocumented. The default when() condition of Fl_Check_Browser is FL_WHEN_NEVER which obviously does not call the callback. I can't tell why this is so, but I believe this should be documented. It's obviously unexpected behavior.

See comment below to make the program do what you (seem to) expect.

#include <stdio.h>
#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Check_Browser.H>

void CB(Fl_Widget*, void *) {
puts("In the callback");
}

int main(int argc, char *argv[]) {
Fl::scheme("gtk+");
Fl_Double_Window *win = new Fl_Double_Window(250, 120, "Simple Browser");
win->begin();
{
    {
      Fl_Check_Browser *brow = new Fl_Check_Browser(10, 10, win->w()-20, 80, "Check");
      brow->callback(CB);

// add here:

       brow->when(FL_WHEN_CHANGED);

      brow->add("Aaa");
      brow->add("Bbb");
      brow->add("Ccc");
      brow->add("Ddd");
      brow->checked(1,1);
      brow->checked(2,1);
    }
}
win->end();
win->resizable(win);
win->show(argc, argv);
return(Fl::run());
}

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