Re: [Gtk2hs-users] casting

[Axel S. <Axe...@en...>]

On Mar 17, 2009, at 20:56, Maurí cio wrote:

>>> I see that widget classes have a 'castTo' member,
>>> like, say, castToPaned or castToWidget.(...)
>>
>> If the widget is a Paned then it's ok. If not, the resulting value is
>> a call to error.
>>
>>> Is it possible to
>>> check if such cast is possible before calling that
>>> function?
>>
>> Yes, there is a function called 'isA' in System.Glib.GObject (...)
>
> Checking your sugestion, I also found the function below that
> also uses GType. But, as in 'isA', I could not found (even
> in Gtk+) how to get values of GType for a given class. The
> code below mentions 'gTypeBox' as a GType for Box, but it has
> no link and haddock index have nothing begging with 'gType'.
> How can I get those?

Uh, yes, these are not exported by default. They can be found in

Graphics.UI.Gtk.Types

Cheers,
Axel.

> widgetGetAncestor
> :: WidgetClass self
> => self
> -> GType                    widgetType - ancestor type
> -> IO (Maybe Widget)        returns the ancestor widget, or Nothing  
> if not found
> Gets the first ancestor of widget with type widgetType. For  
> example, widgetGetAncestor
> widget gTypeBox gets the first Box that's an ancestor of widget.  
> See note about checking
> for a toplevel Window in the docs for widgetGetToplevel.
>
> Thanks,
> Maurício
>
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