eu.future.earth.gwt.charts.client.event.EventBase Maven / Gradle / Ivy
package eu.future.earth.gwt.charts.client.event;
import com.google.gwt.event.shared.EventHandler;
import com.google.gwt.event.shared.GwtEvent;
import com.google.gwt.event.shared.HandlerManager;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.event.shared.SimpleEventBus;
public class EventBase {
private SimpleEventBus handlerManager;
public void fireEvent(GwtEvent event) {
if (handlerManager != null) {
handlerManager.fireEvent(event);
}
}
/**
* Adds this handler to the widget.
*
* @param
* the type of handler to add
* @param type
* the event type
* @param handler
* the handler
* @return {@link HandlerRegistration} used to remove the handler
*/
protected final HandlerRegistration addHandler(final H handler, GwtEvent.Type type) {
return ensureHandlers().addHandler(type, handler);
}
/**
* Ensures the existence of the handler manager.
*
* @return the handler manager
* */
SimpleEventBus ensureHandlers() {
return handlerManager == null ? handlerManager = createHandlerManager() : handlerManager;
}
/**
* Creates the {@link HandlerManager} used by this Widget. You can overwrite this method to create a custom
* {@link HandlerManager}.
*
* @return the {@link HandlerManager} you want to use
*/
protected SimpleEventBus createHandlerManager() {
return new SimpleEventBus();
}
}