[GitHub] hcsuk commented on issue #325: Adding support for ExternalInterface

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hcsuk commented on issue #325: Adding support for ExternalInterface
URL: https://github.com/apache/royale-asjs/pull/325#issuecomment-432929781
 
 
   The idea of defining the API in ActionScript and keeping the type information sounds good.
   I couldn't see any examples of using @externs in ActionScript anywhere, the only thing I could see is a file-level directive within some JavaScript files. I've been trying to get this to work with an AS file but if it's at file scope, it just gets ignored, and if I add it to a function then I get a closure compiler internal error. I'm assuming that this is actually the Royale transpiler that should be removing the function definition when transpiling, so presumably it shouldn't actually create a .js file for it?
   
   I'm slightly unclear how to get the external JavaScript code to call a method within the Royale application still; we would still need to register a callback somehow I guess, or else we'd just have to call the qualified function but without any 'this' parameter. To keep it working with a method closure I believe the "registering a callback" approach is required so we need to define a function somewhere for this - perhaps this then needs to be added to the AS externs code (but without the @extern tag..)
   
   Presumably all of this approach works just for when we compile our apps into JavaScript/HTML, and the application becomes responsible for the compile-switch between JS and SWF and then continues to use flash.external.ExternalInterface in a COMPILE::SWF block...
   
   thanks

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