Re: Interdependent adjustments conundrum

["Daniel Haude" <dunno stoptrick com>]

On Tue, 20 Jun 2006 14:59:16 +0200, Patrik Fimml <patrik fimml gmx at>  
wrote:

> The "instance" argument is the object (the GtkAdjustment in your case)
> on which the signal has been set. You don't need to keep the IDs, it's
> probably much easier to use g_signal_handlers_[un]block_by_func, which
> allow you to (un)block handler by instance, function and user_data.
>
> You then put some kind of the following into the handlers of A, B, and
> C:
>
> g_signal_handlers_block_by_func(
>         D,
>         [Function which was connected on D],
>         [Data which was connected on D, probably NULL]);
>
> gtk_adjustment_change_value(D, d);
>
> g_signal_handlers_unblock_by_func([same arguments as above]);
>
>
> This will prevent your callback from being invoked between block and
> unblock calls.

Curiously, this doesn't work. I do succeed in blocking the signal; if I  
omit the unblocking call, the ABC widgets update D quite nicely -- of  
course if I manually change D nothing happens because the signals stay  
blocked. However, if I unblock after changing the adjustment's value the  
app behaves as if the signals had never been blocked, or as if the signal  
is somehow emitted after the unblocking call. I don't get it.

--robert