Re: menuitem activate

["danielg Posting" <danielg rhce us>]

> You have to find you what dv is, where is is constructed and
> how to pass it where you set up the notify handler.

DirView *
dirview_create (const gchar *root_dir,
                GtkWidget *parent_win,
                GimvThumbWin *tw)
{
(...)


dnotify is being slowly overtaken by inotify but some of the kernels I run
across are older and won't have it in there.  I also don't mind the single
directory, non-recursive, because that's all I need for this.

> It could look like:
> 
>   dv = ... set up the dir view ...
>   /* And here comes your part */
>   setup_notify(dv, &refresh_me);

Okay, I understand the setup_notify and the dv there, what's the refresh_me
for (do?) or is that just another call to the function you have listed below?

What would the call to create the setup_notify be?  I'm already using 

int change_notification(void)

So, that would be 

int change_notification (dv, &handler)
{
 DirView *dv;
 struct sigaction act;
 int fd;
(...)


and above that would be:

static void handler(int sig, siginfo_t *si, void *data, DirectoryView *dv)
{
        event_fd = si->si_fd;
        cb_refresh_dir_tree(dv, NULL);
}

> 
> Where setup_notify() remembers dv, the function to call on
> it, sets up the dnotify() notification (is dnotify() still
> the preferred mechanism? I recall rumours of it being about
> to be replaced from approx. 2 years ago) and does something
> like
> 
>   g_signal_connect(dv, "destroy", G_CALLBACK(stop_notifying), NULL);

okay, g_signal_connect to dv, signal name, callback of stop notification, and
data returned (none).  

So, this is where I need to put the listener (dnotify())?  I would like this
to go on the entire run of the program.  I guess, what's the "destroy" for?


> 
> where stop_notifying() is a function to shut down
> notification for dv and forget dv.  And refresh_me() just
> does
> 
> static void
> refresh_me(DirView *dv)
> {
>     cb_refresh_dir_tree(dv, NULL);
> }

That's the handler() up there.

> 
> I don't know what the lifetime rules are for the directory
> views or whether more of them can be present, but this
> scheme can work quite generally.  You can employ a more
> general callback mechanism, but this should be sufficient in
> your case.

I'm getting there.  I understand what I want to do, I'm just relearning how C
makes me say it.