42 lines
1.4 KiB
Haskell
42 lines
1.4 KiB
Haskell
{-# LANGUAGE MultiParamTypeClasses #-}
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module Affection.MouseInteractable where
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import Affection.Types
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import qualified SDL
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-- class MouseHoverable a us where
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-- onHover :: a -> Affection us ()
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-- | Define a mouse clickable object
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class MouseClickable a us where
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onClick
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:: a -- The object
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-> SDL.MouseButton -- The clicked button
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-> (Int, Int) -- The coordinates of the click
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-> SDL.InputMotion -- The 'SDL.InputMotion' of the click
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-> Int -- The number of clicks
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-> Affection us ()
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-- | A helper function that checks wether provided clickables have been clicked.
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-- This function does not consume provided events, but passes them on.
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handleMouseClicks
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:: (Foldable t, MouseClickable clickable us)
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=> SDL.EventPayload -- ^ Piped event in
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-> t clickable -- ^ 'MouseClickable' elemt to be checked
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-> Affection us SDL.EventPayload -- ^ Unaltered event
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handleMouseClicks e clickables =
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case e of
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SDL.MouseButtonEvent dat -> do
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mapM_ (\clickable -> do
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let SDL.P (SDL.V2 x y) = SDL.mouseButtonEventPos dat
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onClick
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clickable
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(SDL.mouseButtonEventButton dat)
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(fromIntegral x, fromIntegral y)
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(SDL.mouseButtonEventMotion dat)
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(fromIntegral $ SDL.mouseButtonEventClicks dat)
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) clickables
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return e
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_ -> return e
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