Been poking around. Maybe IORef has something to do with this? I found a
qtHaskell example that seems to make use of IORef in order to accomplish
something similar to what I want.
Michael P Mossey wrote:
I'm trying to learn qtHaskell. I realize few people on this list know
anything about qtHaskell, but I have a question that probably relates to
all GUIs as implemented in Haskell. I just need a hint that could help
me figure out the next step, which I might be able to infer from the
qtHaskell API.
I don't think is any tutorial-type or step-by-step type documentation
for qtHaskell. I have sent some questions to the author of qtHaskell,
David Harley, but he hasn't responded yet, and anyway I don't want to
trouble him every time I have a question, so I'm trying to infer as much
as I can.
The problem relates to state. In Qt, one adds state to a widget by
subclassing it and adding new member variables. For example, I want to
create a widget that responds to keypresses and remembers what
keypresses have taken place.
I'm totally stuck on this part, because Haskell doesn't have state.
There must be some kind of Haskell call that adds state to a widget, but
it is hard to figure out from the qtHaskell examples David provides.
Thanks,
Mike
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