Gridval item :
?rowspan:int ->
?colspan:int ->
?sticky:string ->
row:int ->
col:int ->
'a ->
(float * float) ->
'a itemval measure : 'a t -> float * floatval arrange : Widget.box -> 'a t -> ('a * Widget.box) listval columns : 'a t -> float listval rows : 'a t -> float list