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Widget_List question ... [message #12670]

Fri, 07 August 1998 00:00

darran
Messages: 3
Registered: August 1998

Junior Member

By initiating Widget_List without a value field, viz.

list = widget_list(base)

I obtain a list box with no selectable items - fine.
However, if I now add some elements to the listbox, it
doesn't seem possible to get back to this "null" state.
I've tried to get back to a null list via calls like

widget_control, list, set_value=ptr_new()
widget_control, list, set_value=strarr(0)
widget_control, list, set_value=strarr()

with no success. The following gives a selectable
blank:

widget_control, list, set_value=''

Since IDL doesn't allow one to query the value of
a widget_list, I cannot extract the initial value
and discover its type.

Darran.

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