HI,
I have several calls to addListener, for which I have to create a
proxy::
(.. (WPushButton. "Greet me" root) clicked (addListener wapp
(proxy [Signal1$Listener] [] (trigger [ mouse-event ] (.setText
result-text (.getText line-edit)) ))))
I think this is code elligible for simplification with a macro
(correct me if I'm wrong).
In the example above, the macro has to expand to:
(proxy [Signal1$Listener] [] (trigger [ mouse-event ] (.setText result-
text (.getText line-edit))))
but there are other cases, according to the number of argument passed
to trigger:
(proxy [Signal$Listener] [] (trigger [ ] (.setText result-text
(.getText line-edit))))
(proxy [Signal2$Listener] [] (trigger [ arg1 arg2 ] ... ))
(proxy [Signal3$Listener] [] (trigger [ arg1 arg2 arg3 ] ... ))
Here is what I've done for now:
(defmacro deflistener [ interfaces trigger-args & body]
`(proxy [ ~...@interfaces ] [] (trigger [...@trigger-args] ~...@body))
)
Which can be used like this:
( deflistener (Signal1$Listener) (mouse-event) (.setText result-text
(.getText line-edit)) ))
It takes as arguments
* the list of interfaces it implements (currently necessary for
http://www.assembla.com/spaces/clojure/tickets/181)
* the list of arguments passed to the trigger method implemented
* the body of the implementation of trigger
Here are the questions that arise:
* I thought I could and should do away with trigger-args, but if I use
gensyms in the macro to define the arguments received by trigger, how
can I get to the argument values in the code of the method?
* if it implements SignalX$Listener, trigger takes X arguments. How
can implement that with one macro, and still have access to these
arguments in the forms I pass as body of trigger?
Thanks for your help
Raphaël
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