More work on menus

src/Dodge/Data/Universe.hs

@@ -62,7 +62,6 @@ data ScreenLayer
         , _scOptionFlag :: OptionScreenFlag
         , _scSelectionList :: SelectionList (Universe -> Universe)
         , _scAvailableLines :: Int
---        , _scShownItems :: [(SelectionItem,SelectionItemIndex)]
         , _scListDisplayParams :: ListDisplayParams
         }
     | ColumnsScreen

src/Dodge/Menu/Option.hs

@@ -28,46 +28,57 @@ initializeOptionMenu title ops defstr eff u =
         { _scTitle = title
         , _scOptions = ops
         , _scOffset = 0
-        , _scPositionedMenuOption = case defstr of
-            Nothing -> NoPositionedMenuOption
-            Just str -> BottomMenuOption $ (Toggle eff . const . MODString) str
+        , _scPositionedMenuOption = pmo 
         , _scOptionFlag = NormalOptions
-        , _scSelectionList = makeOptionsSelectionList 10 (Just 0) u ops
+        , _scSelectionList = makeOptionsSelectionList 10 (Just 0) u ops pmo
         , _scAvailableLines = getAvailableListLines optionListDisplayParams (u ^. uvConfig)
         , _scListDisplayParams = optionListDisplayParams
         }
+  where
+    pmo = case defstr of
+            Nothing -> NoPositionedMenuOption
+            Just str -> BottomMenuOption $ (Toggle eff . const . MODString) str
 
 refreshOptionsSelectionList :: Universe -> Universe
 refreshOptionsSelectionList u = u & uvScreenLayers . ix 0 %~ f
   where
     f sl = case sl of
         OptionScreen {_scOptions = mops
+            , _scPositionedMenuOption = pmo
             , _scAvailableLines = maxlines} 
-            -> sl & scSelectionList . slItems .~ optionsToSelections maxlines u mops
+            -> sl & scSelectionList . slItems .~ optionsToSelections maxlines u mops pmo
         _ -> sl
      
-makeOptionsSelectionList :: Int -> Maybe Int -> Universe -> [MenuOption] -> SelectionList (Universe -> Universe)
-makeOptionsSelectionList maxlines mselpos u mos = SelectionList
-    { _slItems = optionsToSelections maxlines u mos
+makeOptionsSelectionList :: Int -> Maybe Int -> Universe -> [MenuOption] -> PositionedMenuOption
+    -> SelectionList (Universe -> Universe)
+makeOptionsSelectionList maxlines mselpos u mos pmo = SelectionList
+    { _slItems = optionsToSelections maxlines u mos pmo
     , _slSelPos = mselpos
-    , _slLength = length $ optionsToSelections maxlines u mos
+    , _slLength = length $ optionsToSelections maxlines u mos pmo
     }
 
-optionsToSelections :: Int -> Universe -> [MenuOption] -> [SelectionItem (Universe -> Universe)]
-optionsToSelections maxlines u allops = sits
+optionsToSelections :: Int -> Universe -> [MenuOption] -> PositionedMenuOption -> [SelectionItem (Universe -> Universe)]
+optionsToSelections maxlines u allops pmo = sits
   where
+    offset = u ^?! uvScreenLayers . _head . scOffset
     ops | maxlines >= length allops = allops 
-        | otherwise = take (maxlines - 1) allops ++ [cycleOptionsOption]
+        | otherwise = take (maxlines - 2) (drop offset allops) ++ [cycleOptionsOption]
     maxOptionLength = 3 + maximum (0 : map (optionValueOffset u) ops)
-    colstrs = map (menuOptionToString u maxOptionLength) ops
-    sits = map (menuOptionToSelectionItem u maxOptionLength) ops
+    sits = case pmo of
+        NoPositionedMenuOption -> map (menuOptionToSelectionItem u maxOptionLength) ops
+        TopMenuOption mo -> map (menuOptionToSelectionItem u maxOptionLength) (mo : ops)
+        BottomMenuOption mo -> map (menuOptionToSelectionItem u maxOptionLength) (ops ++ [mo])
     cycleOptionsOption = Toggle cycleOptions (const (MODString "MORE OPTIONS"))
 
 cycleOptions :: Universe -> Universe
 cycleOptions u = fromMaybe u $ do
-    screen <- u ^? uvScreenLayers . ix 0
+    screen <- u ^? uvScreenLayers . _head
     maxlines <- screen ^? scAvailableLines
-    return u
+    numoptions <- fmap length $ screen ^? scOptions
+    return $ u & uvScreenLayers . _head . scOffset %~ f numoptions (maxlines - 2)
+  where
+    f n l curoff | l + curoff >= n = 0
+        | otherwise = l + curoff
 
 colStrToSelItem :: (Color,String) -> SelectionItem (Universe -> Universe)
 colStrToSelItem (col,str) = SelectionItem

src/Dodge/Update.hs

@@ -7,6 +7,7 @@ Description : Simulation update
 module Dodge.Update (updateUniverse) where
 
 --import Dodge.Menu.Option
+import Dodge.Menu.Option
 import Dodge.SelectionList
 import Dodge.Data.SelectionList
 import Dodge.InputFocus
@@ -141,7 +142,8 @@ optionScreenUpdate :: ScreenLayer -> [MenuOption] -> PositionedMenuOption -> Opt
     -> SelectionList (Universe -> Universe)
     -> Universe -> Universe
 optionScreenUpdate screen mos mop _ ldps sl u = 
-     optionScreenDefEff mop
+    refreshOptionsSelectionList
+    . optionScreenDefEff mop
     . mouseClickOptionsList mos screen
     . mouseOverSelectionList ldps sl
     . menuWheelEvents