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implementation module Gtk.Shares
import StdEnv
import StdMaybe
import StdDebug
import Control.Monad
import Data.Functor
import qualified Data.Map
import Gtk
:: Shared a :== (String,a)
share :: !ShareId a -> Shared a | shared a
share id default = (id,default)
getShared :: !(Shared a) -> GtkM a | shared a
getShared (id,default) = retrieve <$> getState
where
retrieve {shares} = case 'Data.Map'.get id shares of
Nothing -> default
Just (v :: a^) -> v
Just d -> trace_n warning default
with
warning = "getShared type mismatch: expected "+++
toString (typeCodeOfDynamic (dynamic default))+++"; got "+++
toString (typeCodeOfDynamic d)
setShared :: !(Shared a) !a -> GtkM a | shared a
setShared (id,_) v =
modState (\st -> {st & shares='Data.Map'.put id (dynamic v) st.shares}) >>|
pure v
updateShared :: !(a -> a) !(Shared a) -> GtkM a | shared a
updateShared f shared = getShared shared >>= setShared shared o f
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