g_signal_lookup for interfaces
- From: Bill Haneman <Bill Haneman Sun COM>
- To: gtk-devel-list gnome org
- Subject: g_signal_lookup for interfaces
- Date: Wed, 17 Oct 2001 13:06:30 +0100 (BST)
Hi:
I guess this one is for you, Tim...
We have defined a number of signals in ATK on interfaces. We know we
can't define properties on interfaces now, but we have been using
signals on interfaces, which is supported.
However in order to intercept these signals we need to register an
emission hook. In the bridge to at-spi this is done via a string-based
register call containing the names of the signal and type.
[where type_name = "AtkText", signal_name = "text-caret-moved"]
GType *type = g_type_from_name(type_name);
However, if we call
g_signal_lookup (signal_name, type);
we get an error from g_signal_lookup saying that it cannot lookup
signals for non-instantiable types.
I have been looking at gsignal.c, it seems that the error is only
printed if the signal lookup actually fails to return a non-null
signal_id. It's not clear to me why the lookup fails, seems like the
intention was for it to work for interfaces.
Could you help me diagnose the problem? If I hard-code a call to
g_signal_new() just before my lookup, to make sure the new signal is
registered when I make the call, no diagnostics are printed...
-Bill
------
Bill Haneman x19279
Gnome Accessibility / Batik SVG Toolkit
Sun Microsystems Ireland
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