Safe Haskell | None |
---|---|
Language | Haskell2010 |
SDL.Event exports an interface for working with the SDL event model. Event handling allows your application to receive input from the user. Internally, SDL stores all the events waiting to be handled in an event queue. Using functions like pollEvent
and waitEvent
you can observe and handle waiting input events.
The event queue itself is composed of a series of Event
values, one for each waiting event. Event
values are read from the queue with the pollEvent
function and it is then up to the application to process the information stored with them.
- pollEvent :: MonadIO m => m (Maybe Event)
- pollEvents :: (Functor m, MonadIO m) => m [Event]
- mapEvents :: MonadIO m => (Event -> m ()) -> m ()
- pumpEvents :: MonadIO m => m ()
- waitEvent :: MonadIO m => m Event
- waitEventTimeout :: MonadIO m => CInt -> m (Maybe Event)
- data Event = Event {}
- data EventPayload
- = WindowShownEvent !WindowShownEventData
- | WindowHiddenEvent !WindowHiddenEventData
- | WindowExposedEvent !WindowExposedEventData
- | WindowMovedEvent !WindowMovedEventData
- | WindowResizedEvent !WindowResizedEventData
- | WindowSizeChangedEvent !WindowSizeChangedEventData
- | WindowMinimizedEvent !WindowMinimizedEventData
- | WindowMaximizedEvent !WindowMaximizedEventData
- | WindowRestoredEvent !WindowRestoredEventData
- | WindowGainedMouseFocusEvent !WindowGainedMouseFocusEventData
- | WindowLostMouseFocusEvent !WindowLostMouseFocusEventData
- | WindowGainedKeyboardFocusEvent !WindowGainedKeyboardFocusEventData
- | WindowLostKeyboardFocusEvent !WindowLostKeyboardFocusEventData
- | WindowClosedEvent !WindowClosedEventData
- | KeyboardEvent !KeyboardEventData
- | TextEditingEvent !TextEditingEventData
- | TextInputEvent !TextInputEventData
- | KeymapChangedEvent
- | MouseMotionEvent !MouseMotionEventData
- | MouseButtonEvent !MouseButtonEventData
- | MouseWheelEvent !MouseWheelEventData
- | JoyAxisEvent !JoyAxisEventData
- | JoyBallEvent !JoyBallEventData
- | JoyHatEvent !JoyHatEventData
- | JoyButtonEvent !JoyButtonEventData
- | JoyDeviceEvent !JoyDeviceEventData
- | ControllerAxisEvent !ControllerAxisEventData
- | ControllerButtonEvent !ControllerButtonEventData
- | ControllerDeviceEvent !ControllerDeviceEventData
- | AudioDeviceEvent !AudioDeviceEventData
- | QuitEvent
- | UserEvent !UserEventData
- | SysWMEvent !SysWMEventData
- | TouchFingerEvent !TouchFingerEventData
- | MultiGestureEvent !MultiGestureEventData
- | DollarGestureEvent !DollarGestureEventData
- | DropEvent !DropEventData
- | ClipboardUpdateEvent
- | UnknownEvent !UnknownEventData
- data WindowShownEventData = WindowShownEventData {}
- data WindowHiddenEventData = WindowHiddenEventData {}
- data WindowExposedEventData = WindowExposedEventData {}
- data WindowMovedEventData = WindowMovedEventData {}
- data WindowResizedEventData = WindowResizedEventData {}
- data WindowSizeChangedEventData = WindowSizeChangedEventData {}
- data WindowMinimizedEventData = WindowMinimizedEventData {}
- data WindowMaximizedEventData = WindowMaximizedEventData {}
- data WindowRestoredEventData = WindowRestoredEventData {}
- data WindowGainedMouseFocusEventData = WindowGainedMouseFocusEventData {}
- data WindowLostMouseFocusEventData = WindowLostMouseFocusEventData {}
- data WindowGainedKeyboardFocusEventData = WindowGainedKeyboardFocusEventData {}
- data WindowLostKeyboardFocusEventData = WindowLostKeyboardFocusEventData {}
- data WindowClosedEventData = WindowClosedEventData {}
- data SysWMEventData = SysWMEventData {}
- data KeyboardEventData = KeyboardEventData {}
- data TextEditingEventData = TextEditingEventData {}
- data TextInputEventData = TextInputEventData {}
- data MouseMotionEventData = MouseMotionEventData {}
- data MouseButtonEventData = MouseButtonEventData {}
- data MouseWheelEventData = MouseWheelEventData {}
- data JoyAxisEventData = JoyAxisEventData {}
- data JoyBallEventData = JoyBallEventData {}
- data JoyHatEventData = JoyHatEventData {}
- data JoyButtonEventData = JoyButtonEventData {}
- data JoyDeviceEventData = JoyDeviceEventData {}
- data ControllerAxisEventData = ControllerAxisEventData {}
- data ControllerButtonEventData = ControllerButtonEventData {}
- data ControllerDeviceEventData = ControllerDeviceEventData {}
- data AudioDeviceEventData = AudioDeviceEventData {}
- data UserEventData = UserEventData {
- userEventWindow :: !Window
- userEventCode :: !Int32
- userEventData1 :: !(Ptr ())
- userEventData2 :: !(Ptr ())
- data TouchFingerEventData = TouchFingerEventData {}
- data MultiGestureEventData = MultiGestureEventData {}
- data DollarGestureEventData = DollarGestureEventData {}
- data DropEventData = DropEventData {
- dropEventFile :: !CString
- data UnknownEventData = UnknownEventData {}
- data InputMotion
- data MouseButton
Polling events
pollEvent :: MonadIO m => m (Maybe Event) Source #
Poll for currently pending events. You can only call this function in the thread that set the video mode.
pollEvents :: (Functor m, MonadIO m) => m [Event] Source #
Clear the event queue by polling for all pending events.
mapEvents :: MonadIO m => (Event -> m ()) -> m () Source #
Run a monadic computation, accumulating over all known Event
s.
This can be useful when used with a state monad, allowing you to fold all events together.
pumpEvents :: MonadIO m => m () Source #
Pump the event loop, gathering events from the input devices.
This function updates the event queue and internal input device state.
This should only be run in the thread that initialized the video subsystem, and for extra safety, you should consider only doing those things on the main thread in any case.
pumpEvents
gathers all the pending input information from devices and places it in the event queue. Without calls to pumpEvents
no events would ever be placed on the queue. Often the need for calls to pumpEvents
is hidden from the user since pollEvent
and waitEvent
implicitly call pumpEvents
. However, if you are not polling or waiting for events (e.g. you are filtering them), then you must call pumpEvents
to force an event queue update.
See SDL_PumpEvents
for C documentation.
Wait until the specified timeout for the next available amount.
Event data
A single SDL event. This event occured at eventTimestamp
and carries data under eventPayload
.
Event | |
|
data EventPayload Source #
An enumeration of all possible SDL event types. This data type pairs up event types with their payload, where possible.
Window events
data WindowShownEventData Source #
A window has been shown.
WindowShownEventData | |
|
data WindowHiddenEventData Source #
A window has been hidden.
WindowHiddenEventData | |
|
data WindowExposedEventData Source #
A part of a window has been exposed - where exposure means to become visible (for example, an overlapping window no longer overlaps with the window).
WindowExposedEventData | |
|
data WindowMovedEventData Source #
A Window
has been moved.
WindowMovedEventData | |
|
data WindowResizedEventData Source #
Window has been resized. This is event is always preceded by WindowSizeChangedEvent
.
WindowResizedEventData | |
|
data WindowSizeChangedEventData Source #
The window size has changed, either as a result of an API call or through the system or user changing the window size; this event is followed by WindowResizedEvent
if the size was changed by an external event, i.e. the user or the window manager.
WindowSizeChangedEventData | |
|
data WindowMinimizedEventData Source #
The window has been minimized.
WindowMinimizedEventData | |
|
data WindowMaximizedEventData Source #
The window has been maximized.
WindowMaximizedEventData | |
|
data WindowRestoredEventData Source #
The window has been restored to normal size and position.
WindowRestoredEventData | |
|
data WindowGainedMouseFocusEventData Source #
The window has gained mouse focus.
WindowGainedMouseFocusEventData | |
|
data WindowLostMouseFocusEventData Source #
The window has lost mouse focus.
WindowLostMouseFocusEventData | |
|
data WindowGainedKeyboardFocusEventData Source #
The window has gained keyboard focus.
WindowGainedKeyboardFocusEventData | |
|
data WindowLostKeyboardFocusEventData Source #
The window has lost keyboard focus.
WindowLostKeyboardFocusEventData | |
|
data WindowClosedEventData Source #
The window manager requests that the window be closed.
WindowClosedEventData | |
|
data SysWMEventData Source #
A video driver dependent system event
Keyboard events
data KeyboardEventData Source #
A keyboard key has been pressed or released.
KeyboardEventData | |
|
data TextEditingEventData Source #
Keyboard text editing event information.
TextEditingEventData | |
|
data TextInputEventData Source #
Keyboard text input event information.
TextInputEventData | |
|
Mouse events
data MouseMotionEventData Source #
A mouse or pointer device was moved.
MouseMotionEventData | |
|
data MouseButtonEventData Source #
A mouse or pointer device button was pressed or released.
MouseButtonEventData | |
|
data MouseWheelEventData Source #
Mouse wheel event information.
MouseWheelEventData | |
|
Joystick events
data JoyAxisEventData Source #
Joystick axis motion event information
JoyAxisEventData | |
|
data JoyBallEventData Source #
Joystick trackball motion event information.
JoyBallEventData | |
|
data JoyHatEventData Source #
Joystick hat position change event information
JoyHatEventData | |
|
data JoyButtonEventData Source #
Joystick button event information.
JoyButtonEventData | |
|
data JoyDeviceEventData Source #
Joystick device event information.
JoyDeviceEventData | |
|
Controller events
data ControllerAxisEventData Source #
Game controller axis motion event information.
ControllerAxisEventData | |
|
data ControllerButtonEventData Source #
Game controller button event information
ControllerButtonEventData | |
|
data ControllerDeviceEventData Source #
Controller device event information
ControllerDeviceEventData | |
|
Audio events
data AudioDeviceEventData Source #
AudioDeviceEventData | |
|
User events
data UserEventData Source #
Event data for application-defined events.
UserEventData | |
|
Touch events
data TouchFingerEventData Source #
Finger touch event information.
TouchFingerEventData | |
|
Gesture events
data MultiGestureEventData Source #
Multiple finger gesture event information
MultiGestureEventData | |
|
data DollarGestureEventData Source #
Complex gesture event information.
DollarGestureEventData | |
|
Drag and drop events
data DropEventData Source #
An event used to request a file open by the system
DropEventData | |
|
Unknown events
data UnknownEventData Source #
SDL reported an unknown event type.
UnknownEventData | |
|
Auxiliary event data
data InputMotion Source #
data MouseButton Source #
ButtonLeft | |
ButtonMiddle | |
ButtonRight | |
ButtonX1 | |
ButtonX2 | |
ButtonExtra !Int | An unknown mouse button. |