Hi all,
I have defined (in C) a GObject subclass which defines a virtual
method which should create a new GtkWidget:
========
/**
* ap_application_plugin_build_widget:
* @self: the #ApApplicationPlugin.
*
* Returns: (transfer floating): a #GtkWidget, or %NULL.
*/
GtkWidget *
ap_application_plugin_build_widget (ApApplicationPlugin *self)
{
g_return_val_if_fail (AP_IS_APPLICATION_PLUGIN (self), NULL);
return AP_APPLICATION_PLUGIN_GET_CLASS (self)->build_widget (self);
}
========
Then, I have a subclass of ApApplicationPlugin, written in Vala, which
should reimplement the build_widget() virtual method. But is it possible
to write it so that it returns a floating reference?
I tried:
========
[ CCode ( returns_floating_reference = true ) ]
public override unowned Gtk.Widget build_widget () {
return new Gtk.Label ("Hello world!");
}
========
but the code doesn't compile: "Return value transfers ownership but
method return type hasn't been declared to transfer ownership". If I
introduce a member variable to hold the GtkWidget then it works, but the
generated C code still calls g_object_ref_sink().
It seems that the "returns_floating_reference" does nothing, or I didn't
understand how to use it?
Ciao,
Alberto
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