Example usage for com.google.gwt.event.logical.shared HasAttachHandlers addAttachHandler

Introduction

In this page you can find the example usage for com.google.gwt.event.logical.shared HasAttachHandlers addAttachHandler.

Prototype

HandlerRegistration addAttachHandler(AttachEvent.Handler handler);

Source Link

Document

Adds an AttachEvent handler.

Usage

From source file:gwt.material.design.client.base.helper.EventHelper.java

License:Apache License

public static void onAttachOnce(HasAttachHandlers has, AttachEvent.Handler handler) {
    HandlerRegistration[] reg = new HandlerRegistration[1];
    reg[0] = has.addAttachHandler(event -> {
        if (event.isAttached()) {
            handler.onAttachOrDetach(event);

            if (reg[0] != null) {
                reg[0].removeHandler();//from  w  w  w.j  a va  2 s  . com
            }
        }
    });
}

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From source file:org.rstudio.studio.client.application.events.EventBus.java

License:Open Source License

/**
 * Similar to 2-arg form of addHandler, but automatically removes handler
 * when the HasAttachHandlers object detaches.
 *
 * If the HasAttachHandlers object detaches and reattaches, the handler
 * will NOT automatically resubscribe./*from  w  ww. j  a  v  a 2s  . co m*/
 */
public <H extends EventHandler> void addHandler(HasAttachHandlers removeWhenDetached, Type<H> type, H handler) {
    final HandlerRegistration reg = addHandler(type, handler);
    removeWhenDetached.addAttachHandler(new Handler() {
        @Override
        public void onAttachOrDetach(AttachEvent event) {
            if (!event.isAttached())
                reg.removeHandler();
        }
    });
}

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