com.gwtmobile.ui.kitchensink.client.communication.JsonpPage.java Source code

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Here is the source code for com.gwtmobile.ui.kitchensink.client.communication.JsonpPage.java

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/* Copyright (c) 2011 Zhihua (Dennis) Jiang
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.gwtmobile.ui.kitchensink.client.communication;

import com.google.gwt.core.client.GWT;
import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.jsonp.client.JsonpRequestBuilder;
import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiField;
import com.google.gwt.uibinder.client.UiHandler;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.Widget;
import com.gwtmobile.ui.client.event.SelectionChangedEvent;
import com.gwtmobile.ui.client.page.Page;

public class JsonpPage extends Page {

    private static JsonpPageUiBinder uiBinder = GWT.create(JsonpPageUiBinder.class);

    @UiField
    HTML text;

    interface JsonpPageUiBinder extends UiBinder<Widget, JsonpPage> {
    }

    public JsonpPage() {
        initWidget(uiBinder.createAndBindUi(this));
    }

    @UiHandler("list")
    void onListSelectionChanged(SelectionChangedEvent e) {
        switch (e.getSelection()) {
        case 0:
            makeJsonpCall();
            break;
        }
    }

    private void makeJsonpCall() {
        String url = "http://gwtmobile-services.appspot.com/jsonp";
        JsonpRequestBuilder jsonp = new JsonpRequestBuilder();
        jsonp.requestObject(url, new AsyncCallback<Hello>() {
            @Override
            public void onFailure(Throwable throwable) {
                text.setHTML("Error: " + throwable);
            }

            @Override
            public void onSuccess(Hello hello) {
                text.setHTML(hello.world());
            }
        });
    }

    private static class Hello extends JavaScriptObject {

        protected Hello() {
        }

        public final native String world() /*-{
                                           return this.Hello;
                                           }-*/;
    }
}