gwt3-processors's Introduction

gwt3-processors

What is it ?

It's a set of helper processors that can speed up j2cl development by generation boiler-plate code.

The latest version: https://search.maven.org/search?q=g:org.treblereel.j2cl.processors

It contains the following features:

@GWT3EntryPoint acts pretty much the same as Gwt2 EntryPoint, the annotated method ll be called on application startup.

public class App {

@GWT3EntryPoint
public void init() {
  HTMLButtonElement btn = (HTMLButtonElement) DomGlobal.document.createElement("button");
  btn.textContent = "PRESS ME !";
  }
}

@ES6Module allows us to use Es6 modules via JsInterop.

@ES6Module
@JsType(isNative = true, namespace = "org.treblereel.j2cl.shim")
public class ES6Test {
  public String id;
  public native boolean isTest();
 }

 class ES6Test {
  constructor() {
    /** @type {string} */
    this.id = "#id"
  }
  /**
  * @return {boolean}
  */
  isTest() {
    return true;
  }
 }
export { ES6Test };

@GWT3Export allows a resulted JavaScript file to be called from the pure JavaScript environment.

@JsType
@GWT3Export
public class ExportTestClass {

    @JsProperty
    public static String staticProperty = "staticProperty";
  
    @JsMethod
    public static String test2(String s) {
      return s;
    }
  
    @JsProperty
    public String id = "qwerty";
  
    @JsMethod
    public String test1(String s) {
      return s;
    }
}

  var test = new org.treblereel.j2cl.exports.ExportTestClass();

  expect(test.test1('INSTANCE METHOD CALL')).toBe('INSTANCE METHOD CALL');
  expect(test.id).toBe('qwerty');

  expect(org.treblereel.j2cl.exports.ExportTestClass.test2('STATIC METHOD CALL')).toBe('STATIC METHOD CALL');
  expect(org.treblereel.j2cl.exports.ExportTestClass.staticProperty).toBe('staticProperty');