com.google.gwt.sample.feedreader.client.FeedSelectPanel.java Source code

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Here is the source code for com.google.gwt.sample.feedreader.client.FeedSelectPanel.java

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/*
 * Copyright 2007 Google Inc.
 * 
 * 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.google.gwt.sample.feedreader.client;

import com.google.gwt.ajaxfeed.client.impl.ErrorWrapper;
import com.google.gwt.ajaxfeed.client.impl.FeedCallback;
import com.google.gwt.ajaxfeed.client.impl.FindResultApi;
import com.google.gwt.ajaxfeed.client.impl.Globals;
import com.google.gwt.core.client.GWT;
import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.user.client.Command;
import com.google.gwt.user.client.DeferredCommand;
import com.google.gwt.user.client.History;
import com.google.gwt.user.client.IncrementalCommand;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.FlowPanel;

import java.util.Iterator;
import java.util.List;

/**
 * A panel to allow the user to choose feeds from a search result.
 */
public class FeedSelectPanel extends WallToWallPanel {
    private static final FindResultApi RESULT_API = (FindResultApi) GWT.create(FindResultApi.class);

    public FeedSelectPanel(final ConfigurationPanel parent, final Configuration configuration, String query) {
        super("Select feed...", parent);

        FeedCallback fc = new FeedCallback() {
            public void onLoad(final JavaScriptObject jso) {
                RESULT_API.bind(jso);

                ErrorWrapper error = RESULT_API.getError(jso);
                if (error != null) {
                    Window.alert("Unable to find feeds.\n" + error.getMessage());
                    return;
                }

                // Remove the loading message
                clear();

                // Update the UI piecewise
                DeferredCommand.addCommand(new IncrementalCommand() {
                    List feeds = configuration.getFeeds();
                    Iterator i = RESULT_API.getEntries(jso).iterator();

                    public boolean execute() {
                        final FindResultApi.Entry entry = (FindResultApi.Entry) i.next();
                        if (feeds.contains(entry.getUrl())) {
                            return i.hasNext();
                        }

                        UnsunkLabel title = new UnsunkLabel(entry.getTitle(), true);
                        title.addStyleName("title");
                        UnsunkLabel snippit = new UnsunkLabel(entry.getContentSnippet(), true);
                        snippit.addStyleName("snippit");
                        UnsunkLabel url = new UnsunkLabel(entry.getUrl());
                        url.addStyleName("snippit");

                        FlowPanel vp = new FlowPanel();
                        vp.add(title);
                        vp.add(snippit);
                        vp.add(url);

                        add(new PanelLabel(vp, new Command() {
                            public void execute() {
                                History.newItem(entry.getUrl());
                            }
                        }));

                        return i.hasNext();
                    }
                });
            }
        };

        Globals.API.findFeeds(query, fc);

        addStyleName("FeedSelectPanel");
        add(new PanelLabel("Waiting for results"));
    }

    protected String getShortTitle() {
        return "Select feeds";
    }
}