44 lines
No EOL
1.8 KiB
Haskell
44 lines
No EOL
1.8 KiB
Haskell
module RPGEngine.Input.LevelSelection
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( handleInputLevelSelection
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) where
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import RPGEngine.Input.Core (InputHandler, composeInputHandlers, handleKey, ListSelector (..))
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import RPGEngine.Data (Game (..), State (..), Direction (..))
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import Graphics.Gloss.Interface.IO.Game (Key(..))
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import Graphics.Gloss.Interface.IO.Interact (SpecialKey(..))
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import RPGEngine.Config (levelFolder)
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import RPGEngine.Parse (parse)
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------------------------------ Exported ------------------------------
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handleInputLevelSelection :: InputHandler Game
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handleInputLevelSelection = composeInputHandlers [
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handleKey (SpecialKey KeySpace) selectLevel,
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handleKey (SpecialKey KeyUp) $ moveSelector North,
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handleKey (SpecialKey KeyDown) $ moveSelector South
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]
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----------------------------------------------------------------------
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-- Select a level and load it in
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selectLevel :: Game -> Game
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selectLevel game@Game{ state = LevelSelection{ levelList = list, selector = selector }} = newGame
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where newGame = parse $ levelFolder ++ (list !! index)
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index = selection selector
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selectLevel g = g
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-- Move the selector either up or down
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moveSelector :: Direction -> Game -> Game
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moveSelector dir game@Game{ state = state@LevelSelection{ levelList = list, selector = selector } } = newGame
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where newGame = game{ state = newState }
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newState = state{ selector = newSelector }
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newSelector | constraint = selector{ selection = newSelection }
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| otherwise = selector
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constraint = 0 <= newSelection && newSelection < length list
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newSelection = selection selector + diff
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diff | dir == North = -1
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| dir == South = 1
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| otherwise = 0
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moveSelector _ g = g |