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convinient design pattern

 
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Hi,

I am currently searching a design pattern for a listener feature. I have many kind of gwt widgets. To each of them I need to add own listener but calling common function in runtime(adding listener).

I would like to have common interface with function e.g. addListener() and every implementing class should add own listener(clickHandler, valueChangeHandler,...) which call same function.

I don't know how it can be solved nicely. Could you recommend a design pattern for it.

Thanks, mc
 
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