Viewing file:  GtkAttributesFacade.py (2.05 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
"""This module contains the GtkAttributesFacade class."""
from gobject import GObject
class GtkAttributesFacade:
"""Wrap a GTK instance to simplify the way attributes are referenced.
Given a GTK instance i, make it possible for any functions i.get_foo() and
i.set_foo(value) to be accessed via i.foo like a normal attribute.
The following attributes are used:
instance - This is the GTK instance that is being wrapped.
"""
def __init__(self, instance):
"""Accept the instance."""
self.__dict__["instance"] = instance
def __setattr__(self, name, value):
"""Simplify the way attributes are referenced.
When trying to do self.foo = something, if there is a
self.instance.set_foo() method, use it. Otherwise, just set the
attribute in self.
Return value so that chaining is possible.
"""
setter = "set_" + name
if hasattr(self.instance, setter):
apply(getattr(self.instance, setter), [value])
else:
self.__dict__[name] = value
return value
def __getattr__(self, name):
"""Simplify the way attributes are referenced.
Remember that this method is called after a failed lookup in self. Try
looking for self.instance.foo. Next, try looking for a
self.instance.get_foo() method, and call it if it exists. Otherwise,
raise an exception.
If a value is successfully looked up, and if it is a subclass of
GObject, wrap it in a GtkAttributesFacade before returning it.
"""
getter = "get_" + name
if hasattr(self.instance, name):
ret = getattr(self.instance, name)
elif hasattr(self.instance, getter):
ret = apply(getattr(self.instance, getter))
else:
raise AttributeError(
"%s instance has no attribute '%s'" %
(self.instance.__class__.__name__, name))
if isinstance(ret, GObject):
ret = GtkAttributesFacade(ret)
return ret
|