Hi,
I'm using callback VALUECHANGED_CB with list control, to populate
another list control, when user selects one item. Inside function, I use
VALUE attribute to know what item was selected.
But, my list controls don´t allow edition, or, EDITBOX=NO.
If this can help you, I use too AttributeHandle to link one list control
with another list control, in C:
Ihandle * ih = IupGetAttributeHandle(list, "list_city_uid");
ih will be populated according user selection.
Best regards,
Ranier Vilela
________________________________________
De: helen.wri...@atiras.com <helen.wri...@atiras.com>
Enviado: segunda-feira, 14 de janeiro de 2019 12:55
Para: iup-users@lists.sourceforge.net
Assunto: [Iup-users] Dropdown plus editbox -- how best to get value
I have a list control (Place) with both dropdown and editbox true. The user can
either select an existing value or enter a new one. Using IUP 3.5 with Lua
under windows.
If they select an existing value, I need to populate a second list control
(Address) – also dropdown and editbox – with the known addresses for the
selected Place.
If they enter a new Place via the editbox, I need to eliminate duplicate spaces
and check if it is still a new Place. If it’s not new, I need to select the
‘duplicate’ Place (the one they should have selected) and populate the Address
list; if it is new, I need to update a lookup table and clear the Address list.
I’m trying to determine the best call backs to use to implement this.
Should I be using Action to detect is an existing item is selected? If I’m
reading the documentation correctly, because it’s an editbox, Place.VALUE won’t
tell me what the selected item is if it’s an existing item, but the text and
parameters for the Action callback will?
Or Valuechanged? Again, Place.VALUE won’t help for an existing item.
Or should I be using a combination – if Action fires, then an existing item has
been selected (does it fire if a new item is added?); and if Valuechanged
fires, it’s a new item? Or might they both fire, in which case what would be
the order.
And if so, how do I define two callbacks within this (parameterised) structure:
function MakeList(options)
local l = iup.list{}
if options.callback ~= nil then
local callback = options.callback
local ebox = (options.editbox or "NO") == "YES"
if ebox then
l = iup.list{valuechanged_cb = function(self) callback() end}
else
l =iup.list{killfocus_cb = function(self) callback() end }
end
end
l.editbox = options.editbox or "NO"
l.dropdown=options.dropdown or "YES"
return l
end
_______________________________________________
Iup-users mailing list
Iup-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/iup-users
