[Haskell-beginners] type hierarchies / records
razvan.rotaru at gmail.com
Thu Mar 14 16:58:52 CET 2013
I suspect my problem has been discussed many times and under many forms, so
please don't shoot me for asking. I could not find an acceptable solution
yet, and beeing as stubborn as i am, I still hope the solution is eluding
me because of my poor haskell knowlegde. So here I am posting my question
on this mailing list.
Basically I am trying to GUI Widgets using haskell types (Buttons,
1/ Using Records is not acceptable because of the name clashes between
attribute names. I could use prefixes and write functions in typeclasses
for accessor, but it's ugly and a lot of work.
2/ I decided to keep the attributes in Maps, so basically a textfield would
data Textfield = Textfield (Map.Map TextfieldProps String)
The problem is: how to define TextfieldProps? It should be something like:
data TextfieldProps = Id | Label | Value
But then, buttons also have Id's and labels. So following is not accepted
data ButtonProps = Id | Label | OnClick
Ideas and suggestions are much appreciated. Thank You,
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