add_filter

Description:

public void add_filter (FilterFunc function)

Adds an event filter to this, allowing you to intercept events before they reach GDK.

This is a low-level operation and makes it easy to break GDK and/or GTK+, so you have to know what you're doing. Pass null for this to get all events for all windows, instead of events for a specific window.

If you are interested in X GenericEvents, bear in mind that XGetEventData has been already called on the event, and XFreeEventData must not be called within function.

Parameters:

this	a Window
function	filter callback
data	data to pass to filter callback