Hey guys,
I am kind of confused by the way Gtk handles widget theming. I know
that styling information is stored
in a GtkStyleContext object corresponding to the GtkWidget to be
themed. However, if I want to install a
new style property into a widget, I need to use methods defined in
GtkWidget:
Gtk.Widget.install_style_property ()
Gtk.Widget.install_style_property_parser ()
Also, the methods for retrieving properties seem kind of redundant -
StyleContext Widget
============ ======
Gtk.StyleContext.get_style_property () vs
Gtk.Widget.style_get_property ()
Gtk.StyleContext.get_style_valist () vs
Gtk.Widget.style_get_valist ()
Gtk.StyleContext.get_valist ()
Gtk.StyleContext.@get () vs Gtk.Widget.style_get ()
(at least that's the vala syntax)
Gtk.Widget.find_style_property ()
Gtk.Widget.list_style_properties ()
Why is that? In what ways do e.g. StyleContext.get_style_property and
Widget.style_get_property differ?
Which one of them should I use in order to be able to theme custom
widgets?
Also, please consider this example:
If I subclass GtkWidget and register a custom property "dummy", I can
access that property using
myobj.style_get ("dummy", out somevariable);
whereas this fails saying "Style property 'dummy' is not registered":
myobj.get_style_context ().@get (Gtk.StateFlags.NORMAL, "dummy",
out somevariable);
(I put the full example into a pastebin: http://sprunge.us/BQKP)
In what ways are the StyleContext methods different from the GtkWidget
ones? How come I can access custom-defined
style properties from GtkWidget but not from GtkStyleContext?
Can someone please clear me up?
Thanks a ton,
Lukas
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