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Using SERVE-EVENT with the CLX Interface to X
Remember from section 7.1, an object set is a collection of
objects, CLX windows in this case, with some set of operations, event keywords,
with corresponding implementations, the same handler functions. Since X allows
multiple display connections from a given process, you can avoid using object
sets if every window in an application or display connection behaves the same.
If a particular X application on a single display connection has windows that
want to handle certain events differently, then using object sets is a
convenient way to organize this since you need some way to map the window/event
combination to the appropriate functionality.
The following is a discussion of functions exported from the extensions
package that facilitate handling CLX events through system:serve-event.
The first two routines are useful regardless of whether you usesystem:serve-event:
[Function]
ext: open-clx-display
&optional string
This function parses string for an X display specification
including display and screen numbers. String defaults to the
following:
(cdr (assoc :display ext:*environment-list* :test #'eq))
If any field in the display specification is missing, this signals
an error. ext:open-clx-display returns the CLX display and
screen.
[Function]
ext: flush-display-events
display
This function flushes all the events in display's event queue
including the current event, in case the user calls this from within
an event handler.
Subsections
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Peter Van Eynde
2001-03-08