Re: gtk events question

[Owen Taylor <otaylor redhat com>]

Marc van Kempen <marc@bowtie.nl> writes:

> Hi,
> 
> I'm trying to execute an external program and have a 
> popup which signals the user to wait for the program to
> end. In my callback which executes the program I have 
> something like:
> 
> jb_msg_create("wait blabla");		/* this creates the popup window */
> 
> /* now try to wait until the window has been created and displayed */

Waiting for a window to show like this is never a good idea,
since GTK+ usually will go idle before the X server shows
the window and responds. Instead use:

void       gtk_widget_show_now            (GtkWidget           *widget);

instead of gtk_widget_show() to show your window.

> n = gtk_events_pending();
> for (i=0; i<n; i++) {
> 	gtk_main_iteration();
> }
>	
> exec_program();
> 
> jb_show_results();
> 
> return;
> 
> 
> But this doesn't give me the desired result as it does not handle
> all pending events, so I must be doing something wrong.
> 
> I then tried:
> 
>     n = gtk_events_pending();
>     while (n > 0) {
> 	for (i=0; i<n;i++) {
> 	    gtk_main_iteration();
> 	}
> 	n = gtk_events_pending();
>     }
> 
> 
> But this is blocking in gtk_main_iteration() and will only continue
> after I move the mouse.
> 
> So what is the recommended way of handling such a scenario?

gtk_events_pending() should be considered to return a boolean.

Try:

 while (gtk_events_pending())
   gtk_main_iteration()

Regards,
                                        Owen