[FLTK] Howto refresh a widget immediately

dsmith · #1 06-Sep-2004, 11:00

I have a small program, where the I do a somewhat lengthy process from FLTK. I wanted to be able to track the status of this process in my dialog, so I added an Fl_Output widget where I can drop the status at certain points, such as:

CPP / C++ / C Code:

d->ot_info->value("WAIT --- Computing weekly scores");

This works fine, except that it does not "refresh" the screen until my entire process is completed. Is there a way that I can make FLTK refresh the widget immediately when I change it?

dsmith · #2 18-Sep-2004, 07:47

I got two equally good answers to this problem. The first is to set the widget damage to 1, like:

CPP / C++ / C Code:

d->ot_info->value("WAIT --- Computing weekly scores");
d->ot_info->damage(1);

This immediately redraws the widget.

The second is to call Fl::check(), which checks everything to make sure that a redraw is not needed everywhere.

CPP / C++ / C Code:

d->ot_info->value("WAIT --- Computing weekly scores");
Fl::check();

Both worked equally well as far as I could tell. I choose to use the first, because it seems to be more efficient, as it only checks the applicable widget. However, I could not perceive a performance difference in either of these methods.

dsmith · #3 18-Sep-2004, 08:52

Okay, I jumped the gun a bit. Setting damage to 1 does not seem to work. So the only valid answer I have is:

CPP / C++ / C Code:

d->ot_info->value("WAIT --- Computing weekly scores");
Fl::check();

Sorry... But this does seem to work

podarok · #4 09-Nov-2004, 03:08

and Yet One Question - how to refresh it in fltk2.0?

Ponder_Stibbons · #5 09-Nov-2004, 03:42

Quote:

Originally Posted by podarok

and Yet One Question - how to refresh it in fltk2.0?

Whats about redraw()?
I can not try but it sounds like it should do it.
Regards Mark

podarok · #6 09-Nov-2004, 04:01

Quote:

Originally Posted by Ponder_Stibbons

Whats about redraw()?
I can not try but it sounds like it should do it.
Regards Mark

not work 8(....
fltk::check(); //too
log_b->damage();//too
log_b->redraw();//too
in any combination...

dsmith · #7 09-Nov-2004, 07:23

Oh you are kidding! This doesn't work under 2.0? I am going to have to download the cvs to play with, but it amazes me that this is not carried through...

podarok · #8 09-Nov-2004, 08:23

Quote:

Originally Posted by dsmith

Oh you are kidding! This doesn't work under 2.0? I am going to have to download the cvs to play with, but it amazes me that this is not carried through...

my code is:

CPP / C++ / C Code:

for (i=0;i<100;i++){
log_b->add("hm...");
log_b->bottomline(i);
//here I want to refresh
log_w->damage();//the same with redraw()
fltk::check();//nothing ... even after end of this block log_b(Browser) stay in freeze on 1st line(topline)
}
log_b->bottomline(100);//this work!

//my sources are from http://www.fltk.net (a few week before (298 arc number))

fltk2user · #9 11-Dec-2004, 01:54

Quote:

Originally Posted by podarok

my code is:
for (i=0;i<100;i++){
log_b->add("hm...");
log_b->bottomline(i);
//here I want to refresh
log_w->damage();//the same with redraw()
fltk::check();//nothing ... even after end of this block log_b(Browser) stay in freeze on 1st line(topline)
}
log_b->bottomline(100);//this work!
//my sources are from http://www.fltk.net (a few week before (298 arc number))

You propably want to do:

CPP / C++ / C Code:

 for(int i=0;i<100;i++)
 {
   log_b->add("hm...");
   log_b->bottomline(log_b->children()-1);
   log_b->set_focus();
   // fltk::check(); // Call this if you need to update in each iteration of loop
 }

This will select always select last line in fltk::Browser

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