Re: jsinterop @JsFunction: How to get this (context)?

Thanks for the confirmation.

Here is how I did it. The following is simplified and minimized jsinterop from D3 bindings.

The function at hand selection.selectAll takes a callback (MultiSelectorA) that has set context (this) of the current matching element.

Here is how I did it for future reference...

@JsType(isNative = true, namespace = JsPackage.GLOBAL, name = "d3")                                                                                                                                                                                                                                                                         public class D3 {                                                                                                                                                                                                                                                                                                                               @JsFunction                                                                                                                                                                                                                                                                                                                                 public interface MultiSelectorA<T> {                                                                                                                                                                                                                                                                                                            public Element[] find(Element context, T d, int i, int nodes);                                                                                                                                                                                                                                                                     }  
    /* we need this in order to pass the this argument into our java callback */      private static class Wrapper {          public static native JavaScriptObject wrap(                  MultiSelectorA selector) /*-{                          return function(a, b, c) {                                  return selector(this, a, b, c);                          }          }-*/;      }        @JsType(isNative = true)      public static class Selection {          /**           * @todo TODO:           *           *       Requirement @JsFunction can access the context (this)           *       <ul>           *       <li>Enable (uncomment):</li>           *       <ul>           *       <li>native selectAll(MultiSelectorA selector)</li>           *       </ul>           *       <li>Delete:</li>           *       <ul>           *       <li>private native Selection _selectAll(JavaScriptObject callback)</li>           *       <li>private static class Wrapper</li>           *       <li>public @JsOverlay selectAll(MultiSelectorA selector)</li>           *       <li>Make Selection interface from concrete class</li>           *       </ul>           *           **/          // public native Selection selectAll(MultiSelectorA selector);            @JsMethod(name = "selectAll")          private native Selection _selectAll(JavaScriptObject callback);            @JsOverlay          public final Selection selectAll(MultiSelectorA selector) {              return _selectAll(Wrapper.wrap(selector));          }      }  }

On Mon, Oct 10, 2016 at 5:23 AM, Stepan Koltsov <stepan.koltsov@gmail.com> wrote:

Seems like it is not possible. I had to create jsni stub to grab this and pass it as parameter.

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