Chapter 19. Timeouts, IO and Idle Functions

Table of Contents

19.1. Timeouts
19.2. Monitoring IO
19.3. Idle Functions

19.1. Timeouts

You may be wondering how you make GTK do useful work when in main(). Well, you have several options. Using the following gobject module function you can create a timeout function that will be called every "interval" milliseconds.

  source_id = gobject.timeout_add(interval, function, ...)

The interval argument is the number of milliseconds between calls to your function. The function argument is the callback you wish to have called. Any arguments after the second are passed to the function as data. The return value is an integer "source_id" which may be used to stop the timeout by calling:


You may also stop the timeout callback function from being called again by returning zero or FALSE from your callback. If you want your callback to be called again, it should return TRUE.

Your callback should look something like this:

  def timeout_callback(...):

The number of arguments to the callback should match the number of data arguments specified in timeout_add().