You could use fltk build-in capabilities by using either
Fl::add_timeout() or Fl::repeat_timeout() functions.
Lets say you have a widget w and you want to update its label every 0.1
second. Write a function like
void timeout_callback(void * widget){
static time_t last_time= 0
char buffer[128];
time_t new_time = time(0) ;
if(new_time!= last_time){ // change
last_time = new_time;
struct tm * ts = localtime(&new_time);
strftime(buffer, sizeof(bufffer), "%a %Y-%m-%d %H:%M:%S %Z", ts);
Fl_Widget * w = (Fl_Widget *)w;
w->copy_label(buffer);
w->redraw_label();
}
Fl::add_timeout(0.1, &timeout_callback, widget);
}
and assign callback for the first time by
Fl::add_timeout(0, &timeout_callback, widget);
If you destroy the widget before program ends be sure to remove the timeout
Fl::remove_timeout(&timeout_callback, widget);
otherwise your program would crash on the next timeout call.
R.
Moslem Kazemi wrote:
> Hi fltkers,
>
> I am a newbie! :) and am trying to see if fltk would suit my application
> needs. I would appreciate your help re. the following question.
>
> I try to pose my question through a simple example as follows:
> Let's say I have a fltk window with a text output widget and a member
> variable which itself is a class, say a timer. I would like to see what is
> the proper way that I could access/update the value of the text output widget
> from within the methods of the class timer?
> Should I pass a pointer of the text widget to the timer class? Is there way
> that I could post a message from within the methods in timer class to the
> main window and ask to update the widget value?
>
> Thanks,
> --Moslem.
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