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

Introduction

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

Source

/*
 * 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.http.client.URL;
import com.google.gwt.user.client.Command;
import com.google.gwt.user.client.History;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.FlowPanel;

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

/**
 * The panel by which the application is configured.
 */
public class ConfigurationPanel extends WallToWallPanel {
    private final Configuration configuration;
    private final HashMap feedLabels = new HashMap();
    private final ManifestPanel parent;

    public ConfigurationPanel(final Configuration configuration, final ManifestPanel parent) {
        super("Configuration", parent);
        this.configuration = configuration;
        this.parent = parent;
        final List feeds = configuration.getFeeds();

        setEditCommand("Reset", "Delete all application settings", new Command() {
            public void execute() {
                if (!Window.confirm("Do you wish to reset the application?")) {
                    return;
                }
                configuration.reset();
                parent.setDirty();
                exit();
            }
        });

        add(new PanelLabel("About...", new Command() {
            public void execute() {
                History.newItem("about");
            }
        }));

        // Create the search option
        {
            UnsunkLabel title = new UnsunkLabel("Search for new feeds...");
            title.addStyleName("title");
            UnsunkLabel info = new UnsunkLabel("Add feeds by searching.");
            info.addStyleName("snippit");

            FlowPanel vp = new FlowPanel();
            vp.add(title);
            vp.add(info);

            add(new PanelLabel(vp, new Command() {
                public void execute() {
                    final String query = Window.prompt("Search query", "");
                    if ((query != null) && (query.length() > 0)) {
                        History.newItem("search||" + URL.encodeComponent(query));
                    }
                }
            }));
        }

        // Add all of the feeds to the panel.
        for (Iterator i = feeds.iterator(); i.hasNext();) {
            final Configuration.Feed feed = (Configuration.Feed) i.next();
            addFeed(feed);
        }
    }

    public void enter() {
        super.enter();
        History.newItem("configuration");
    }

    /**
     * Perform the necessary UI updates to display a new feed configuration
     * option.
     */
    protected void addFeed(final Configuration.Feed feed) {
        UnsunkLabel title = new UnsunkLabel("Remove " + feed.getTitle());
        title.addStyleName("title");
        UnsunkLabel snippit = new UnsunkLabel(feed.getUrl());
        snippit.addStyleName("snippit");

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

        PanelLabel p = new PanelLabel(vp, new Command() {
            public void execute() {
                remove(feed);
            }
        });
        p.setTitle("Delete this feed");

        feedLabels.put(feed, p);
        add(p);
    }

    protected String getShortTitle() {
        return "Configuration";
    }

    /**
     * Remove a feed's representation from the UI.
     */
    protected void remove(Configuration.Feed feed) {
        if (Window.confirm("Do you wish to remove the feed?")) {
            configuration.getFeeds().remove(feed);
            remove((PanelLabel) feedLabels.get(feed));
            parent.setDirty();
        }
    }

    void showAbout() {
        (new AboutPanel(this)).enter();
    }

    void showSearch(String query) {
        FeedSelectPanel selector = new FeedSelectPanel(ConfigurationPanel.this, configuration, query);
        selector.enter();
    }
}