如何在Enthought Traitsui中使View项变为只读且可滚动？

Question

I am using the views in Enthought Traitsui. Within a view, I am using Item('strings', enabled_when='len(x)>20') , where 'strings' is a list of strings and len(x)>20 is never true. If there are more than three strings in the list, I cannot see them all. I would like to be able to scroll through all the strings but at the same time not be allowed to edit the strings. Does anybody know if I can have a readonly AND scrollable item, and if not what are the alternatives? Thank you.

Answer 1

I think you're looking for a way to customize the editor. Here's the general idea in a minimal example:

from traits.api import HasTraits, List
from traitsui.api import View, ListEditor, Group, Item


class Foo(HasTraits):
    my_list = List()

    def _my_list_default(self):
        return [str(n) for n in range(6)]

    traits_view = View(
        Item('my_list',
            style='custom',
            editor=ListEditor(
                style='text',
                ),
        ),
        height=100,
    )

if __name__ == '__main__':
    f = Foo()
    f.configure_traits()

You can look in the TraitsUI docs to find lots of ways to customize the view with different editor factories. You can change style='readonly' for instance to prevent editing.