module Graphics.UI.Editor.Basics (
Getter
, Setter
, Injector
, Extractor
, Applicator
, Editor
, getStandardRegFunction
, emptyNotifier
, GUIEvent(..)
, GUIEventSelector(..)
, GtkRegFunc
, Notifier(..)
, GtkHandler
, activateEvent
, propagateEvent
, allGUIEvents
) where
import Graphics.UI.Gtk
import qualified Graphics.UI.Gtk.Gdk.Events as Gtk
import Data.Unique
import Data.IORef
import Control.Monad
import Graphics.UI.Editor.Parameters
import Control.Event
import Data.Map (Map(..))
import qualified Data.Map as Map (delete,insert,lookup,empty)
import Data.Maybe (isJust,fromJust)
import Unsafe.Coerce (unsafeCoerce)
import Control.Arrow (first)
import MyMissing (allOf)
type Getter alpha beta = alpha -> beta
type Setter alpha beta = beta -> alpha -> alpha
type Injector beta = beta -> IO ()
type Extractor beta = IO (Maybe beta)
type Applicator beta gamma = beta -> gamma ()
type Editor alpha = Parameters -> Notifier
-> IO(Widget, Injector alpha , Extractor alpha)
data GUIEvent = GUIEvent {
selector :: GUIEventSelector
, gtkEvent :: Gtk.Event
, eventPaneName :: String
, gtkReturn :: Bool
}
instance Event GUIEvent GUIEventSelector where
getSelector = selector
data GUIEventSelector = Clicked
| FocusOut
| FocusIn
| SelectionChanged
| ButtonRelease
| AfterKeyRelease
deriving (Eq,Ord,Show,Enum,Bounded)
instance EventSelector GUIEventSelector
allGUIEvents :: [GUIEventSelector]
allGUIEvents = allOf
type GtkHandler = Gtk.Event -> IO Bool
type GtkRegFunc = Widget -> GtkHandler -> IO (ConnectId Widget)
type GUIEventReg = ([ConnectId Widget],
([Notifier], Map Unique [(Unique,Notifier)]))
newtype Notifier = Noti (IORef (Handlers GUIEvent IO GUIEventSelector,
Map GUIEventSelector GUIEventReg))
emptyNotifier :: IO Notifier
emptyNotifier = do
h <- newIORef (Map.empty,Map.empty)
let noti = Noti h
return noti
instance EventSource Notifier GUIEvent IO GUIEventSelector where
getHandlers (Noti pairRef) = do
(h,_) <- readIORef pairRef
return h
setHandlers (Noti pairRef) h = do
(_,r) <- readIORef pairRef
writeIORef pairRef (h,r)
myUnique _ = newUnique
canTriggerEvent _ _ = True
registerEvent o@(Noti pairRef) eventSel hand@(Left handler) = do
(handlers, ger) <- readIORef pairRef
unique <- myUnique o
newGer <- case Map.lookup eventSel ger of
Nothing -> return ger
Just (_,([],um)) -> return ger
Just (cids,(notifiers,um)) -> do
lu <- mapM (\es -> registerEvent es eventSel hand)
notifiers
let jl = map (first fromJust)
$ filter (isJust.fst)
$ zip lu notifiers
let newUm = Map.insert unique jl um
return (Map.insert eventSel (cids,(notifiers,newUm)) ger)
let newHandlers = case eventSel `Map.lookup` handlers of
Nothing -> Map.insert eventSel
[(unique,handler)] handlers
Just l -> Map.insert eventSel
((unique,handler):l) handlers
writeIORef pairRef (newHandlers,newGer)
return (Just unique)
registerEvent o@(Noti pairRef) eventSel (Right unique) = do
(handlers, ger) <- readIORef pairRef
newGer <- case Map.lookup eventSel ger of
Nothing -> return ger
Just (cids,(notis,um)) ->
case unique `Map.lookup` um of
Nothing -> return ger
Just l -> do
mapM_ (\(u,es) -> registerEvent es eventSel (Right u)) l
let newUm = unique `Map.delete` um
return (Map.insert eventSel (cids,(notis,newUm)) ger)
let newHandlers = case eventSel `Map.lookup` handlers of
Nothing -> handlers
Just l -> case filter (\ (mu,_) -> mu /= unique) l of
[] -> Map.delete eventSel handlers
l -> Map.insert eventSel l handlers
writeIORef pairRef (newHandlers,newGer)
return (Just unique)
propagateEvent :: Notifier -> [Notifier] -> GUIEventSelector -> IO ()
propagateEvent (Noti pairRef) eventSources eventSel = do
(handlers,ger) <- readIORef pairRef
let newGer = case Map.lookup eventSel ger of
Nothing -> Map.insert eventSel
([],(eventSources,Map.empty)) ger
Just (w,(notiList,unregMap)) -> Map.insert eventSel
(w,(eventSources ++ notiList,unregMap)) ger
newGer2 <- case eventSel `Map.lookup` handlers of
Nothing -> return newGer
Just hl -> foldM (repropagate eventSel) newGer hl
writeIORef pairRef (handlers,newGer)
where
repropagate :: GUIEventSelector
-> Map GUIEventSelector GUIEventReg
-> (Unique, GUIEvent -> IO GUIEvent)
-> IO (Map GUIEventSelector GUIEventReg)
repropagate eventSet ger (unique,hand) =
case Map.lookup eventSel ger of
Just (cids,(notifiers,um))
-> do
lu <- mapM (\es -> registerEvent es eventSel (Left hand))
notifiers
let jl = map (first fromJust)
$ filter (isJust.fst)
$ zip lu notifiers
let newUm = Map.insert unique jl um
return (Map.insert eventSel (cids,(notifiers,newUm)) ger)
_ -> error "Basics>>propagateEvent: impossible case"
activateEvent :: Widget -> Notifier -> Maybe GtkRegFunc -> GUIEventSelector -> IO()
activateEvent widget (Noti pairRef) mbRegisterFunc eventSel = do
let registerFunc = case mbRegisterFunc of
Just f -> f
Nothing -> getStandardRegFunction eventSel
cid <- registerFunc widget (\ e -> do
(hi,_) <- readIORef pairRef
case Map.lookup eventSel hi of
Nothing -> return False
Just [] -> return False
Just handlers -> do
name <- widgetGetName widget
eventList <- mapM (\f -> do
let ev = GUIEvent eventSel e name False
f ev)
(map snd handlers)
let boolList = map gtkReturn eventList
return (foldr (&&) True boolList))
(handerls,ger) <- readIORef pairRef
let newGer = case Map.lookup eventSel ger of
Nothing -> Map.insert eventSel ([cid],([],Map.empty))
ger
Just (cids,prop) ->
Map.insert eventSel (cid:cids,prop) ger
writeIORef pairRef (handerls,newGer)
getStandardRegFunction :: GUIEventSelector -> GtkRegFunc
getStandardRegFunction FocusOut = \w h -> w `onFocusOut` h
getStandardRegFunction FocusIn = \w h -> w `onFocusIn` h
getStandardRegFunction ButtonRelease = \w h -> w `onButtonRelease` h
getStandardRegFunction AfterKeyRelease = \w h -> w `afterKeyRelease` h
getStandardRegFunction Clicked = \w h -> do
res <- onClicked (castToButton w) (do
h (Gtk.Event True)
return ())
return (unsafeCoerce res)
getStandardRegFunction SelectionChanged = error "yet not implemented"