[Fwd: program flow--please help]

[greg <gregor waltz villanova edu>]

i replied directly to him with my idea. not sure if it's correct, but
since you're discussing it, i thought i'd put it up :)

shouldn't application development issues be on gtk-app-devel gnome org?



greg wrote:
> 
> A R Hummaida wrote:
> > i have a call back function A that within it calls another function B.
> > the later displays a window for the user to confirm something.
> > during this time fuction A does not wait for B to return, but carries
> > till it finshes. thats not what i am used to in c.
> > how could i get A to wait untill B returns ?(ie after a user confirms
> > within B). i have generated most of the code using Glade.
> 
> yeah, sounds like you're not used to gtk yet :) so, B makes a window
> with button and shows it, right? there's nothing there to stop it. in
> order for the window to be shown, your program needs to return to the
> gtk_main() loop. gtk doesn't do anything to change the way that C works.
> rather, the functions that you call don't block until the user clicks
> your button.
> 
> i think there is a way to do what you want, and i'm pretty certain it's
> been discussed before.
> 
> take a look in the archives here (i have to find something there
> myself.):
> http://mail.gnome.org/archives/gtk-app-devel-list/
> 
> do a search for block, event, and dialog.


greg wrote:
> 
> A R Hummaida wrote:
> 
> > yes i have been looking at the code more, and some how i need function B
> > not to end or reach end before the user has
> > clicked a button.
> > thanks.
> 

<snip>

> there's something i saw called gtk_main_iteration() or so. it *might*
> solve your problems. you would call it after making and showing your
> dialog window and button. i'm not certain exactly how that works. you
> might have to put it in a loop that waits until you get the event that
> you're looking for.
> 
> maybe:
> 
> function_B( GtkWidget *widget, gpointer yes, ...)
> {
>   static gboolean first_time = TRUE;
>   static gboolean got_result = FALSE;
> 
>   if( first_time)
>   {
>     MAKE DIALOG WINDOW;
> 
>     gtk_signal_connect( button_no, ... function_B,
> INT_TO_GPOINTER(FALSE));
>     gtk_signal_connect( button_yes, ... function_B,
> INT_TO_GPOINTER(TRUE));
> 
>     while( !got_result )
>     {
>        gtk_main_iteration();
>     }
> 
>     reset the static variables...
> 
>     got_result = FALSE;
>     first_time = TRUE;
> 
>     destroy the dialog...
>   }
> 
>   else
>   {
>      get result: GPOINTER_TO_INT(yes). do something with it!
>      got_result = TRUE;
>   }
> }

-- 

-greg

http://neenjatech.org

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