18.1. Timeouts
You may be wondering how you make GTK do
useful work when in mainloop().
Well, you have several options. Using the following function you can create
a timeout function that will be called every "interval"
milliseconds.
tag = timeout_add(interval, function, ...)
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The first argument is the number of milliseconds
between calls to your function. The second 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 "tag"
which may be used to stop the timeout by calling:
You may also stop the timeout function
by returning zero or FALSE from your callback. Obviously this means if
you want your callback to continue to be called, it should return a non-zero
value, i.e., TRUE.
Your callback should look something like
this:
def timeout_callback(...):
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The number of arguments to the callback should match the number of data
arguments specified in timeout_add().