glib-0.13.2.1: Binding to the GLIB library for Gtk2Hs.

Maintainergtk2hs-users@lists.sourceforge.net
Stabilityprovisional
Portabilityportable (depends on GHC)
Safe HaskellNone
LanguageHaskell98

System.Glib.MainLoop

Description

main event loop, and events

Synopsis

Documentation

timeoutAdd :: IO Bool -> Int -> IO HandlerId Source

Sets a function to be called at regular intervals, with the default priority priorityDefault. The function is called repeatedly until it returns False, after which point the timeout function will not be called again. The first call to the function will be at the end of the first interval.

Note that timeout functions may be delayed, due to the processing of other event sources. Thus they should not be relied on for precise timing. After each call to the timeout function, the time of the next timeout is recalculated based on the current time and the given interval (it does not try to 'catch up' time lost in delays).

timeoutAddFull :: IO Bool -> Priority -> Int -> IO HandlerId Source

Sets a function to be called at regular intervals, with the given priority. The function is called repeatedly until it returns False, after which point the timeout function will not be called again. The first call to the function will be at the end of the first interval.

Note that timeout functions may be delayed, due to the processing of other event sources. Thus they should not be relied on for precise timing. After each call to the timeout function, the time of the next timeout is recalculated based on the current time and the given interval (it does not try to 'catch up' time lost in delays).

timeoutRemove :: HandlerId -> IO () Source

Remove a previously added timeout handler by its HandlerId.

idleAdd :: IO Bool -> Priority -> IO HandlerId Source

Add a callback that is called whenever the system is idle.

  • A priority can be specified via an integer. This should usually be priorityDefaultIdle.
  • If the function returns False it will be removed.

idleRemove :: HandlerId -> IO () Source

Remove a previously added idle handler by its HandlerId.

data IOCondition Source

Flags representing a condition to watch for on a file descriptor.

IOIn
There is data to read.
IOOut
Data can be written (without blocking).
IOPri
There is urgent data to read.
IOErr
Error condition.
IOHup
Hung up (the connection has been broken, usually for pipes and sockets).
IOInvalid
Invalid request. The file descriptor is not open.

Constructors

IOIn 
IOOut 
IOPri 
IOErr 
IOHup 
IOInvalid 

inputAdd Source

Arguments

:: FD

a file descriptor

-> [IOCondition]

the condition to watch for

-> Priority

the priority of the event source

-> IO Bool

the function to call when the condition is satisfied. The function should return False if the event source should be removed.

-> IO HandlerId

the event source id

Adds the file descriptor into the main event loop with the given priority.

type Priority = Int Source

Priorities for installing callbacks.

data MainLoop Source

A main event loop abstraction.

mainLoopNew Source

Arguments

:: Maybe MainContext

context - the context to use, or Nothing to use the default context

-> Bool

isRunning - True to indicate that the loop is running; False otherwise

-> IO MainLoop

the new MainLoop

Create a new MainLoop.

mainLoopRun :: MainLoop -> IO () Source

Runs a main loop until mainLoopQuit is called on the loop. If this is called for the thread of the loop's MainContext, it will process events from the loop, otherwise it will simply wait.

mainLoopQuit :: MainLoop -> IO () Source

Stops a MainLoop from running. Any calls to mainLoopRun for the loop will return.

mainLoopIsRunning :: MainLoop -> IO Bool Source

Checks to see if the main loop is currently being run via mainLoopRun.

data MainContext Source

An opaque datatype representing a set of sources to be handled in a main loop.

mainContextDefault :: MainContext Source

The default MainContext. This is the main context used for main loop functions when a main loop is not explicitly specified.

mainContextIteration :: MainContext -> Bool -> IO Bool Source

Runs a single iteration for the given main loop. This involves checking to see if any event sources are ready to be processed, then if no events sources are ready and mayBlock is True, waiting for a source to become ready, then dispatching the highest priority events sources that are ready. Note that even when mayBlock is True, it is still possible for mainContextIteration to return (0), since the the wait may be interrupted for other reasons than an event source becoming ready.

newtype Source Source

Constructors

Source (ForeignPtr Source)