Graphics.UI.Gtk.General.General

This function initialized the GUI toolkit and parses all Gtk specific arguments. The remaining arguments are returned. If the initialization of the toolkit fails for whatever reason, an exception is thrown.
Throws: ErrorCall "Cannot initialize GUI."

eventsPending :: IO Int

Inquire the number of events pending on the event queue

mainGUI :: IO ()

Run the Gtk+ main event loop.

mainLevel :: IO Int

Inquire the main loop level.

Callbacks that take more time to process can call mainIteration to keep the GUI responsive. Each time the main loop is restarted this way, the main loop counter is increased. This function returns this counter.

mainQuit :: IO ()

Exit the main event loop.

mainIteration :: IO Bool

Process an event, block if necessary.

Returns True if mainQuit was called while processing the event.

mainIterationDo :: Bool -> IO Bool

Process a single event.

Called with True, this function behaves as mainIteration in that it waits until an event is available for processing. It will return immediately, if passed False.
Returns True if the mainQuit was called while processing the event.

grabAdd :: WidgetClass wd => wd -> IO ()

add a grab widget

grabGetCurrent :: IO (Maybe Widget)

inquire current grab widget

grabRemove :: WidgetClass w => w -> IO ()

remove a grab widget

type Priority = Int

Priorities for installing callbacks.

priorityLow :: Int

priorityDefaultIdle :: Int

priorityHighIdle :: Int

priorityDefault :: Int

priorityHigh :: Int

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

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

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.

timeoutRemove :: HandlerId -> IO ()

Remove a previously added timeout handler by its TimeoutId.

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

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 ()

Remove a previously added idle handler by its TimeoutId.

inputAdd

:: 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.

inputRemove :: HandlerId -> IO ()

data IOCondition

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.

Instances

type HandlerId = CUInt

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