Hello,
According to the iup.list documentation, we have:
*VALUE* (non inheritable): Depends on the DROPDOWN+EDITBOX combination:
- DROPDOWN=YES or MULTIPLE=NO: Integer number representing the selected
item in the list (begins at 1). It can be zero if there is no selected
item. The value can be NULL for no item selected (since 3.0) (In Motif when
DROPDOWN=YES there is always an item selected, except only when the list is
empty).
This means that the value we get/set is an index (which is in fact returned
as a string).
My request would be to be able to get/set value with an actual string
present in the list instead of an index, possibly through another attribute
valuestring.
This would be useful when creating interfaces used to edit data. The data
item associated to a dropdown is saved by storing the list entry's string
and not by its index (in case we add new elements to the possible values
and the list is sorted, which would break existing data because of
reordering). Currently, reading the value involves doing
my_list[my_list.value], and setting the value from loaded data is even
worse: we have to iterate over all strings present in the list, looking for
the one we got from the data, and set the list value to the index where we
found it.
Of course, this poses a problem when the list contains several occurrences
of the same string, but then setting valuestring would select the first
encountered one.
So if I have a list
my_list = iup.list{ "this", "is", "a", "list"}
I would have
my_list.value = 2 -- my_list displays "is"
val = my_list.value -- return 2
val = my_list.valuestring -- return "is"
my_list.valuestring = "this" -- -- my_list selects "this"
my_list.value -- return 1
What do you think?
Regards,
--
Benoit.
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