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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
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
singletonShared :: !String !(GtkM a) -> GtkM a | shared a
singletonShared name setup =
let shr = share name Nothing in
getShared shr >>= \val -> case val of
Just val ->
pure val
Nothing ->
setup >>= \val ->
setShared shr (Just val) >>|
pure val
withShared :: a !((Shared a) -> GtkM b) -> GtkM b | shared a
withShared default f =
updateShared inc temp_share_id >>= \id ->
let shared_value = share ("withShared"+++toString id) default in
f shared_value
// TODO: remove share from map
where
temp_share_id = share "withShared_temp_share_id" 0
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