STR #1387

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STR #1387

Application:FLTK Library
Status:1 - Closed w/Resolution
Priority:3 - Moderate, e.g. unable to compile the software
Scope:2 - Specific to an operating system
Subsystem:WIN32
Summary:fltk main loop hogs cpu, when window size becomes 0,0
Version:1.1-current
Created By:xovo
Assigned To:matt
Fix Version:1.1-current (SVN: v5346)
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Name/Time/Date Text top right image
 
#1 xovo
12:13 Aug 03, 2006
With the program below (which is a stripped-down version of a normal use case in my application) fltk uses 100% cpu.
I'm aware that size 0,0 might not be really supported, but i would prefer fltk to handle this case instead of using a workaround.

-------------

#include <FL/Fl.H>
#include <FL/Fl_Gl_Window.H>
#include <stdio.h>

int main(int argc, char **argv)
{
    Fl_Window *window = new Fl_Window(300,200);
    window->clear_border(); // no border!!
    window->show();

    // wait some time
    Fl::wait(10.);
    window->size(0,0);

    while(true) {
        printf("LOOP ");
        // doesn't wait....
        Fl::wait(100.);
    }

    return 0;
}
 
 
#2 matt
03:52 Aug 17, 2006
On which operating system?  
 
#3 xovo
05:35 Aug 17, 2006
that's on Windows XP  
 
#4 matt
04:50 Aug 23, 2006
Fixed in Subversion repository.

Zero size windows countinously trigger WM_PAINT events. This is a knowns issue and a bug in WIN32. We now avaoid that by simply resizing windows to at least 1x1. If you need an invisible window, just hide it ;-)
 
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