In the following example, I am having trouble with getting enabled_when to work for nested objects.  When b is set to 1, a is disabled as expected; however, when object.c.y is set to 1, object.c.x. is not disabled.

Am I using the wrong syntax?

Thanks!
Brad

Apologies, here is the example code:

from enthought.traits.api import *
from enthought.traits.ui.api import *

class Bar(HasTraits):

    x = Int
    y = Int

class Foo(HasTraits):

    a = Int
    b = Int
    c = Instance(Bar)

foo_view = View(
        VGroup(
            Item('a'),
            Item('b', enabled_when='a==1'), #WORKS
            Item('object.c.x', enabled_when='object.c.y==1'), #DOES NOT WORK
            Item('object.c.y'),
            ),
        resizable=True,
        )

if __name__ == '__main__':
    obj = Foo(c=Bar())
    obj.configure_traits(view=foo_

Hi,

I have a Range trait that I want to update during __init__(). Specifically, I want to up set the high attribute of the Range object. The code below demonstrates how I've envisioned the problem.

class slice_viewer(HasTraits):
    image = Array
    slice_range = Property( Range( 0, 100 ), depends_on=['image'] )
    ...
    def __init__(self, inputImage):
        self.image = inputImage
        ....
    def _get_slice_range(self):
        """ somehow change the _high attribute in slice_range to be (self.image.shape[0] - 1)
        """"
        return ?

Can someone please shed some light on how this should be done? I tried declaring slice_range._high = Property(Int, depends_on['image']) as an alternative, but couldn't get it going either.

Cheer,
Ju

--
Ju Zhang
PhD Student
Auckland Bioengineering Institute
University of Auckland
New Zealand