Graphics.UI.SDL.Events

Documentation

data Event

High level event structure.

Constructors

NoEvent

GotFocus [Focus]

LostFocus [Focus]

KeyDown !Keysym

KeyUp !Keysym

MouseMotion !Word16 !Word16 !Int16 !Int16

MouseButtonDown !Word16 !Word16 !MouseButton

MouseButtonUp !Word16 !Word16 !MouseButton

JoyAxisMotion !Word8 !Word8 !Int16

device index, axis index, axis value.

JoyBallMotion !Word8 !Word8 !Int16 !Int16

device index, trackball index, relative motion.

JoyHatMotion !Word8 !Word8 !Word8

device index, hat index, hat position.

JoyButtonDown !Word8 !Word8

device index, button index.

JoyButtonUp !Word8 !Word8

device index, button index.

VideoResize !Int !Int

When Resizable is passed as a flag to Graphics.UI.SDL.Video.setVideoMode the user is allowed to resize the applications window. When the window is resized an VideoResize is reported, with the new window width and height values. When an VideoResize is recieved the window should be resized to the new dimensions using Graphics.UI.SDL.Video.setVideoMode.

VideoExpose

A VideoExpose event is triggered when the screen has been modified outside of the application, usually by the window manager and needs to be redrawn.

Quit

User !UserEventID !Int !(Ptr ()) !(Ptr ())

Unknown

Instances

Eq Event

Show Event

Storable Event

data SDLEvent

Low level event structure keeping a one-to-one relation with the C event structure.

Constructors

SDLNoEvent

SDLActiveEvent

SDLKeyDown

SDLKeyUp

SDLMouseMotion

SDLMouseButtonDown

SDLMouseButtonUp

SDLJoyAxisMotion

SDLJoyBallMotion

SDLJoyHatMotion

SDLJoyButtonDown

SDLJoyButtonUp

SDLQuit

SDLSysWMEvent

SDLVideoResize

SDLVideoExpose

SDLUserEvent Word8

SDLNumEvents

Instances

Bounded SDLEvent

Eq SDLEvent

Ord SDLEvent

Show SDLEvent

data UserEventID

Typed user events ranging from 0 to 7

Constructors

UID0

UID1

UID2

UID3

UID4

UID5

UID6

UID7

Instances

Enum UserEventID

Eq UserEventID

Show UserEventID

data MouseButton

Constructors

ButtonLeft

ButtonMiddle

ButtonRight

ButtonWheelUp

ButtonWheelDown

Instances

Eq MouseButton

Ord MouseButton

Show MouseButton

Enum MouseButton Word8

data Focus

Constructors

MouseFocus

InputFocus

ApplicationFocus

Instances

Bounded Focus

Eq Focus

Ord Focus

Show Focus

Enum Focus Word8

toSafePtr :: Typeable a => a -> IO SafePtr

Constructs a safe pointer from an arbitrary value.

tryFromSafePtr :: Typeable a => SafePtr -> IO (Maybe a)

Get object from a safe pointer. Nothing on type mismatch.

fromSafePtr :: Typeable a => SafePtr -> IO a

Get object from a safe pointer. Throws an exception on type mismatch.

typeOfSafePtr :: SafePtr -> IO TypeRep

Return the type of the object the safe pointer was created from.

enableKeyRepeat

Arguments

:: Int

Initial delay. 0 to disable.

-> Int

Interval.

-> IO Bool

Sets keyboard repeat rate. Returns False on error.

enableUnicode :: Bool -> IO ()

Enables or disables unicode translation.

queryUnicodeState :: IO Bool

Returns the current state of unicode translation. See also enableUnicode.

getKeyName :: SDLKey -> String

Gets the name of an SDL virtual keysym.

getMouseState :: IO (Int, Int, [MouseButton])

Retrieves the current state of the mouse. Returns (X position, Y position, pressed buttons).

getRelativeMouseState :: IO (Int, Int, [MouseButton])

Retrieve the current state of the mouse. Like getMouseState except that X and Y are set to the change since last call to getRelativeMouseState.

getModState :: IO [Modifier]

Gets the state of modifier keys.

setModState :: [Modifier] -> IO ()

Sets the internal state of modifier keys.

tryPushEvent :: Event -> IO Bool

Pushes an event onto the event queue. Returns False on error.

pushEvent :: Event -> IO ()

Pushes an event onto the event queue. Throws an exception on error.

pollEvent :: IO Event

Polls for currently pending events.

waitEvent :: IO Event

Waits indefinitely for the next available event.

waitEventBlocking :: IO Event

Waits indefinitely for the next available event. Blocks Haskell threads.

pumpEvents :: IO ()

Pumps the event loop, gathering events from the input devices.

enableEvent :: SDLEvent -> Bool -> IO ()

Enable or disable events from being processed.

queryEventState :: SDLEvent -> IO Bool

Checks current state of a event. See also enableEvent.

getAppState :: IO [Focus]

Gets the state of the application.