haskell-gi-base-0.22.2: Foundation for libraries generated by haskell-gi

Safe HaskellNone
LanguageHaskell98

Data.GI.Base.Signals

Description

Routines for connecting GObjects to signals.

Synopsis

Documentation

on :: forall object info m. (GObject object, MonadIO m, SignalInfo info) => object -> SignalProxy object info -> HaskellCallbackType info -> m SignalHandlerId Source #

Same as connectSignal, specifying from the beginning that the handler is to be run before the default handler.

on object signal handler = liftIO $ connectSignal signal object handler SignalConnectBefore

after :: forall object info m. (GObject object, MonadIO m, SignalInfo info) => object -> SignalProxy object info -> HaskellCallbackType info -> m SignalHandlerId Source #

Connect a signal to a handler, running the handler after the default one.

after object signal handler = liftIO $ connectSignal signal object handler SignalConnectAfter

data SignalProxy (object :: *) (info :: *) where Source #

Support for overloaded signal connectors.

Constructors

SignalProxy :: SignalProxy o info 
PropertyNotify :: (info ~ ResolveAttribute propName o, AttrInfo info, pl ~ AttrLabel info) => AttrLabelProxy propName -> SignalProxy o (GObjectNotifySignalInfo pl) 
Instances
info ~ ResolveSignal slot object => IsLabel slot (SignalProxy object info) Source #

Support for overloaded labels.

Instance details

Defined in Data.GI.Base.Signals

Methods

fromLabel :: SignalProxy object info #

data SignalConnectMode Source #

Whether to connect a handler to a signal with connectSignal so that it runs before/after the default handler for the given signal.

Constructors

SignalConnectBefore

Run before the default handler.

SignalConnectAfter

Run after the default handler.

connectSignalFunPtr :: GObject o => o -> String -> FunPtr a -> SignalConnectMode -> IO SignalHandlerId Source #

Connect a signal to a handler, given as a FunPtr.

disconnectSignalHandler :: GObject o => o -> SignalHandlerId -> IO () Source #

Disconnect a previously connected signal.

type SignalHandlerId = CULong Source #

Type of a GObject signal handler id.

class SignalInfo (info :: *) where Source #

Information about an overloaded signal.

Associated Types

type HaskellCallbackType info Source #

Methods

connectSignal :: GObject o => SignalProxy o info -> o -> HaskellCallbackType info -> SignalConnectMode -> IO SignalHandlerId Source #

Connect a Haskell function to a signal of the given GObject, specifying whether the handler will be called before or after the default handler.

data GObjectNotifySignalInfo (propName :: Symbol) Source #

Connection information for a "notify" signal indicating that a specific property changed (see PropertyNotify for the relevant constructor).