Re: builder on scalar properties

[Torsten Schoenfeld <kaffeetisch gmx de>]

On 12.09.2010 01:35, Kevin Ryde wrote:
> If an object property is a Glib::Scalar, ie. Glib::ParamSpec->scalar,
> can it be set with the<property>  thingie in Gtk2::Builder ?  The few
> lines below get
>
>      Gtk-WARNING **: Failed to set property Foo.myscalar to "hello": Could not parse '"hello"' as a GPerlSV 
> at /tmp/scalar.pl line 21.
>
> and apparently don't set the property.

This messages appears to originate from 
gtk_builder_value_from_string_type in gtk/gtkbuilder.c.  This function 
seems to be responsible for converting the strings coming from XML to 
actual values, and it only knows about the common value types.  I don't 
see any hooks to customize this process.  Not even providing a 
SET_BUILDABLE_PROPERTY override would be sufficient.  I think you'd need 
to have a custom tag for this, handled in a CUSTOM_TAG_START override.