{-# LANGUAGE CPP #-}
{-# LANGUAGE PatternSynonyms #-}
{-# LANGUAGE ForeignFunctionInterface #-}
{-# LANGUAGE JavaScriptFFI #-}
-- For HasCallStack compatibility
{-# LANGUAGE ImplicitParams, ConstraintKinds, KindSignatures #-}
module GHCJS.DOM.JSFFI.Generated.CanvasRenderingContext
       (js_getCanvas, getCanvas, getCanvasUnsafe, getCanvasUnchecked,
        CanvasRenderingContext(..), gTypeCanvasRenderingContext,
        IsCanvasRenderingContext, toCanvasRenderingContext)
       where
import Prelude ((.), (==), (>>=), return, IO, Int, Float, Double, Bool(..), Maybe, maybe, fromIntegral, round, fmap, Show, Read, Eq, Ord)
import qualified Prelude (error)
import Data.Typeable (Typeable)
import GHCJS.Types (JSVal(..), JSString)
import GHCJS.Foreign (jsNull)
import GHCJS.Foreign.Callback (syncCallback, asyncCallback, syncCallback1, asyncCallback1, syncCallback2, asyncCallback2, OnBlocked(..))
import GHCJS.Marshal (ToJSVal(..), FromJSVal(..))
import GHCJS.Marshal.Pure (PToJSVal(..), PFromJSVal(..))
import Control.Monad (void)
import Control.Monad.IO.Class (MonadIO(..))
import Data.Int (Int64)
import Data.Word (Word, Word64)
import Data.Maybe (fromJust)
import GHCJS.DOM.Types
import Control.Applicative ((<$>))
import GHCJS.DOM.EventTargetClosures (EventName, unsafeEventName)
import GHCJS.DOM.JSFFI.Generated.Enums
#if MIN_VERSION_base(4,9,0)
import GHC.Stack (HasCallStack)
#elif MIN_VERSION_base(4,8,0)
import GHC.Stack (CallStack)
import GHC.Exts (Constraint)
type HasCallStack = ((?callStack :: CallStack) :: Constraint)
#else
import GHC.Exts (Constraint)
type HasCallStack = (() :: Constraint)
#endif
 
foreign import javascript unsafe "$1[\"canvas\"]" js_getCanvas ::
        CanvasRenderingContext -> IO (Nullable HTMLCanvasElement)

-- | <https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext.canvas Mozilla CanvasRenderingContext.canvas documentation> 
getCanvas ::
          (MonadIO m, IsCanvasRenderingContext self) =>
            self -> m (Maybe HTMLCanvasElement)
getCanvas self
  = liftIO
      (nullableToMaybe <$>
         (js_getCanvas (toCanvasRenderingContext self)))

-- | <https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext.canvas Mozilla CanvasRenderingContext.canvas documentation> 
getCanvasUnsafe ::
                (MonadIO m, IsCanvasRenderingContext self, HasCallStack) =>
                  self -> m HTMLCanvasElement
getCanvasUnsafe self
  = liftIO
      ((nullableToMaybe <$>
          (js_getCanvas (toCanvasRenderingContext self)))
         >>= maybe (Prelude.error "Nothing to return") return)

-- | <https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext.canvas Mozilla CanvasRenderingContext.canvas documentation> 
getCanvasUnchecked ::
                   (MonadIO m, IsCanvasRenderingContext self) =>
                     self -> m HTMLCanvasElement
getCanvasUnchecked self
  = liftIO
      (fromJust . nullableToMaybe <$>
         (js_getCanvas (toCanvasRenderingContext self)))