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Use an Enum for the mouse buttons.
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276d445f97
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20
gui/Main.hs
20
gui/Main.hs
@ -33,11 +33,17 @@ import qualified Graphics.Rendering.Cairo as Cairo
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import Graphics.Rendering.Cairo.Internal (Render (runRender))
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import Graphics.Rendering.Cairo.Types (Cairo (Cairo))
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leftMouseButton :: Word32
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leftMouseButton = 1
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-- | An Enum of mouse buttons, so order is important!
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data MouseButtons
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= LeftMouseButton
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| MiddleMouseButton
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| RightMouseButton
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deriving (Eq, Ord, Enum)
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rightMouseButton :: Word32
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rightMouseButton = 3
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-- | A mapping between mouse button names and the GTK
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-- mouse button numbers via Enum, so order is important!
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mouseButtonNum :: MouseButtons -> Word32
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mouseButtonNum = fromIntegral . (+ 1) . fromEnum
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nodeSize :: (Double, Double)
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nodeSize = (100, 40)
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@ -97,7 +103,7 @@ emptyInputs =
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_inEvents = mempty
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}
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renderCairo :: Coercible a (GI.Cairo.Context) => a -> Render c -> IO c
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renderCairo :: Coercible a GI.Cairo.Context => a -> Render c -> IO c
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renderCairo c r = withManagedPtr c $ \pointer ->
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runReaderT (runRender r) (Cairo (castPtr pointer))
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@ -324,7 +330,7 @@ startApp app = do
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let backgroundPress eventButton = do
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mouseBtn <- get eventButton #button
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when
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(mouseBtn == rightMouseButton)
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(mouseBtn == mouseButtonNum RightMouseButton)
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( do
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(x, y) <- getXandY eventButton
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@ -345,7 +351,7 @@ startApp app = do
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pure ()
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)
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when
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(mouseBtn == leftMouseButton)
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(mouseBtn == mouseButtonNum LeftMouseButton)
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( do
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putStrLn "Left click"
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mousePosition <- getXandY eventButton
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