Hi,
I'm trying to understand how to create a custom subclass of
gobject.GObject and now I'm working with the properties stuff:
import pygtk
pygtk.require('2.0')
import gobject
class MyObject(gobject.GObject):
__gproperties__ = {
'prop_name' : (gobject.TYPE_STRING, 'short_description',
'long_description', 'initial_value',
gobject.PARAM_READABLE)
}
def __init__(self):
self.__gobject_init__()
self.prop_name = 'initial_value' # [1]
def do_get_property(self, pspec):
if pspec.name == 'prop-name': # [2]
return self.prop_name
else:
raise AttributeError, 'unknown property %s' % pspec.name
def do_set_property(self, pspec, value):
if pspec.name == 'prop-name':
self.prop_name = value
else:
raise AttributeError, 'unknown property %s' % pspec.name
gobject.type_register(MyObject)
print 'MyObject properties:', gobject.list_properties(MyObject)
o1 = MyObject()
print o1.get_property('prop-name')
o1.set_property('prop-name', 'other value') # [3]
print o1.get_property('prop-name')
And here are my questions:
[1] No matter if I create a gobject property I still need to create a
Python property to 'hold' the actual data. Is this correct?
[2] If my property is called prop_name, PyGTK internally converts it to
prop-name so if I do o1.get_property('prop_name') I get an error. If I
have to create a instance variable like self.prop_name I can't create
code that make this two sentences equivalent:
print o1.prop_name
print o1.get_property('prop_name') # this raises an error
[3] If I have set the flags for the property as gobject.PARAM_READABLE
why this statement is not raising an error or even a warning?:
o1.set_property('prop-name', 'other value')
Do I have to take this in consideration when writing the do_set_property
method?
I don't know if I'm doing it right but so far I don't find gobjects
properties very useful when using them from Python. And I think what
people actually dislikes most is the fact that you have to call
gobject.type_register with your class, which is pretty ok with me.
Cheers
Lorenzo Gil Sanchez
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