Readonly vs. non-readonly specification lead to a different format

[stefanoborini]

The following

    traits_view = View(
            VGroup(
                Item(
                    "model.name",
                    resizable=True,
                    style="readonly"
                ),
                Item(
                    "model.definition",
                    resizable=True,
                    style="readonly"
                ),
                Item("model.type",
                     style="readonly"
                     ),
                Item("model.shape",
                     editor=CSVListEditor(),
                     style="readonly"
                     ),
                Item(
                    "model.length",
                    visible_when="model.type == 'string'",
                    style="readonly"
                ),

                label="CUBA Data Type",
                show_border=True,
            ))

Results in this

However, if I remove the readonly, the result is more compact

[corranwebster]

DIfferent widgets under the covers (eg. QTextField vs. QLabels) so Qt has different default rules about how they can expand. Try playing with resizable=False or perhaps if it fits the UX, just use the non-readonly version, but have enabled_when='False'

[stefanoborini]

True, but I think that if there's an underlying difference in the vertical expand, traitsui should guarantee that they behave the same.

[corranwebster]

Note that you will get different layout behaviour also if you make the textbox style='custom', which I think will be closer to the readonly style. Based on that, its not clear what's "correct" and what behaviour should be guaranteed.

TraitsUI is not designed for pixel-perfect layout.