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# 12.12.8 Declaring Event Types

CLX uses the declare-event macro to define the event slot symbols that access the contents of X events. Most client applications do not need to use declare-event because the declarations for all core X events are already defined by CLX. Programmers using extensions to the X protocol can use declare-event to allow CLX to handle new event types returned by an extended X server.

declare-event | event-codes & rest slot-declarations | Macro

| event-codes An event type keyword or a list of event type keywords. slot-declarations A list of clauses defining event slot symbols. Defines a mapping between event slot symbols and the data items in event messages received from an X server. The event-codes argument gives the event type keyword for the event described. If several event types share the same slots, then event-codes can be a list of event type keywords. slot-declarations is a list containing an element for each event data item. The order of slot-declarations corresponds to the order of event data items defined by the X protocol. Each element of slot-declarations is a list of the form ( type slot-name*), where type is a Common Lisp type specifier and slot-name is a slot name symbol. The effect of such a list is to declare that the next data items in the event have the given data type and are associated with the given slot-name symbols. slot-name can also be a list of slot name symbols; in this case, each symbol in the list is an alias that refers to the same event data item.

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