Am Mittwoch, 16. August 2017 09:24:49 UTC+2 schrieb Bill Tang:
>
> I am working on a Jsinterop wrapper for the GSAP javascript library, and I
> am quite new to GWT, so I have come across a few problems I am not sure how
> to solve.
>
> My main issue revolves around trying to wrap javascript functions into
> Java objects.
>
> For example, if I have a native javascript function that has a function as
> one of its parameters, how can I go about wrapping this function
> in java?
>
The parameter that is a JS Function should be modeled using a Java
functional interface, e.g. JsFunction<In, Out> { Out exec(In input); }.
Then you can use Java method references or lambdas.
> And if a javascript class has a function has one of its properties, how
> can I go about wrapping this property?
>
Similar as above. In Java the property type would be a @JsFunction
annotated interface.
I've had some success using the @JsFunction annotation along with
> functional interfaces, but I am faced with the problem
> where I have to declare return types, parameters, and paramater types in
> the java interface, when I want to be able to supply
> any arbitrary function, just like I would in native javascript. Is there
> any way to mimic this functionality?
>
Java is strongly typed, so some JS things are not possible in Java. Do you
have a concrete example? Usually JS libs have some rules to functions and
which parameters they expect. If you have trouble with so called "union
types" you can take a look
at
https://docs.google.com/document/d/14mQeAGQ9M_5uTTUbzRQzCYETA887dTO-xFLtQhgUXXk/edit
to see how the jsinterop generator handles it.
-- J.
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