package samples;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.core.client.JsDate;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.json.client.JSONObject;
import com.google.gwt.json.client.JSONParser;
import com.google.gwt.json.client.JSONString;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.Window;
public class JsBus extends JavaScriptObject {
public static class JsHandlerRegistration extends JavaScriptObject
implements HandlerRegistration {
protected JsHandlerRegistration() {}
@Override
public native final void removeHandler() /*-{
this.removeHandler();
}-*/;
}
public static interface Callback {
void call(JavaScriptObject event);
}
public static final native JsBus getInstance() /*-{
var name = "jsBusSingletonInstance";
return $wnd[name] || ($wnd[name] = (function(){
var _h = {};
return {
fire:function(key, evt){
if(_h[key]){
for(var
i=0;i<_h[key].length;i++){
try {
_h[key][i](evt);
}
catch(e) {}
}
}
},
addHandler:function(key, handler){
(_h[key] || (_h[key] =
[])).push(handler);
return {
removeHandler:function(){
if(_h[key]){
for(var
i=_h[key].length-1; i>-1; i--){
if(_h[key][i] === handler){
_h[key].splice(i, 1);
if(_h[key].length == 0){
_h[key] = null;
delete _h[key];
}
return;
}
}
}
}
};
}
}
})());
}-*/;
protected JsBus() {}
public void fire(String key, JSONObject event) {
fire(key, event.getJavaScriptObject());
}
public native void fire(String key, JavaScriptObject event) /*-{
this.fire(key, event);
}-*/;
public native JsHandlerRegistration addHandler(String key, Callback
callback) /*-{
return this.addHandler(key, function(evt){
callback.@samples.JsBus.Callback::call(Lcom/google/gwt/core/client/
JavaScriptObject;)(evt);
});
}-*/;
}
class A implements EntryPoint {
@Override
public void onModuleLoad() {
final JsBus jsBus = JsBus.getInstance();
jsBus.addHandler("timer_in_b", new JsBus.Callback() {
@Override
public void call(JavaScriptObject event) {
Window.alert(event.<JsDate>
cast().toLocaleTimeString());
}
});
new Timer() {
@Override
public void run() {
JSONObject event = new JSONObject();
event.put("message", new JSONString("Message
from class A!"));
event.put("data", JSONParser
.parseStrict("{\"someData\":[1,2,3]}"));
jsBus.fire("event_from_A", event);
}
}.schedule(10000);
}
}
class B implements EntryPoint {
@Override
public void onModuleLoad() {
final Timer timer = new Timer() {
@Override
public void run() {
JsBus.getInstance().fire("timer_in_b",
JsDate.create());
}
};
timer.scheduleRepeating(1500);
JsBus.getInstance().addHandler("event_from_A", new
JsBus.Callback()
{
@Override
public void call(JavaScriptObject event) {
timer.cancel();
Window.alert(new
JSONObject(event).get("message")
.isString().stringValue());
}
});
}
}
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