/*
* Copyright 2008 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.museum.client.viewer;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.core.client.GWT;
import com.google.gwt.dom.client.LinkElement;
import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.logical.shared.SelectionEvent;
import com.google.gwt.event.logical.shared.SelectionHandler;
import com.google.gwt.museum.client.common.AbstractIssue;
import com.google.gwt.museum.client.common.Utility;
import com.google.gwt.user.client.DeferredCommand;
import com.google.gwt.user.client.IncrementalCommand;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.AbstractImagePrototype;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.HasVerticalAlignment;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.ImageBundle;
import com.google.gwt.user.client.ui.ListBox;
import com.google.gwt.user.client.ui.MultiWordSuggestOracle;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.SimplePanel;
import com.google.gwt.user.client.ui.SuggestBox;
import com.google.gwt.user.client.ui.SuggestOracle;
import com.google.gwt.user.client.ui.Widget;
import com.google.gwt.user.client.ui.SuggestOracle.Suggestion;
import java.util.ArrayList;
import java.util.HashSet;
/**
* A repository for demonstrating bugs we once faced.
*/
public class Museum implements EntryPoint {
/**
* Images used in the museum.
*/
public static interface MuseumImages extends ImageBundle {
AbstractImagePrototype nextButton();
AbstractImagePrototype prevButton();
}
/**
* Class used to implement a callback when a css file is loaded. We add a
* width style of 10px to isLoaded classes, then test to see if the style is
* active.
*/
class Poller implements IncrementalCommand {
private HTML test;
private AbstractIssue issue;
private SimplePanel monitor = new SimplePanel();
public Poller() {
RootPanel.get().add(monitor);
}
public boolean execute() {
if (test.getOffsetWidth() == 10) {
issueContainer.setWidget(issue.createIssue());
issue.onAttached();
return false;
} else {
return true;
}
}
public void startPolling(AbstractIssue issue) {
test = new HTML();
test.setStyleName("isLoaded");
monitor.setWidget(test);
this.issue = issue;
DeferredCommand.addCommand(this);
}
}
/**
* The images used in this application.
*/
public static final MuseumImages IMAGES = GWT.create(MuseumImages.class);
/**
* A reference for all issues.
*/
private final ArrayList<AbstractIssue> issues = new ArrayList<AbstractIssue>();
/**
* Add an issue to the list of issues.
*/
private final Poller poller = new Poller();
/**
* The panel that contains the current example.
*/
private final SimplePanel issueContainer = new SimplePanel();
/**
* A container to hold the CSS that will be applied to the issue.
*/
private LinkElement issueLinkElement = null;
/**
* A description of the current issue.
*/
private final HTML issueDescription = new HTML();
/**
* The list of all issues.
*/
private final ListBox issueList = new ListBox();
/**
* Add an issue to the museum. Should be called in the inherited constructor.
*
* @param issue the issue to be added
*/
public void addIssue(AbstractIssue issue) {
issues.add(issue);
}
public void onModuleLoad() {
// Add the options and issue containers to the page
RootPanel.get().add(createOptionsPanel());
RootPanel.get().add(issueDescription);
issueDescription.setStylePrimaryName("museum-issueDescription");
RootPanel.get().add(issueContainer);
issueContainer.setStylePrimaryName("museum-issueContainer");
// Default to the first issue
refreshIssue();
}
/**
* Create a suggest box with all current suggestions in it.
*/
private SuggestBox createIssueFinder() {
class IssueSuggestion extends MultiWordSuggestOracle.MultiWordSuggestion {
private AbstractIssue issue;
public IssueSuggestion(AbstractIssue issue) {
super("", issue.getHeadline());
this.issue = issue;
}
public AbstractIssue getIssue() {
return issue;
}
}
SuggestOracle oracle = new SuggestOracle() {
@Override
public void requestSuggestions(Request request, Callback callback) {
String ofInterest = (".*" + request.getQuery() + ".*").toLowerCase();
ArrayList<Suggestion> suggestions = new ArrayList<Suggestion>();
HashSet<AbstractIssue> s = new HashSet<AbstractIssue>();
for (AbstractIssue issue : issues) {
if (issue.getHeadline().toLowerCase().matches(ofInterest)) {
s.add(issue);
suggestions.add(new IssueSuggestion(issue));
}
}
for (AbstractIssue issue : issues) {
if (!s.contains(issue) && issue.getInstructions().matches(ofInterest)) {
suggestions.add(new IssueSuggestion(issue));
}
}
callback.onSuggestionsReady(request, new Response(suggestions));
}
};
SuggestBox box = new SuggestBox(oracle);
box.addSelectionHandler(new SelectionHandler<Suggestion>() {
public void onSelection(SelectionEvent<Suggestion> event) {
AbstractIssue issue = ((IssueSuggestion) event.getSelectedItem()).getIssue();
int index = issues.indexOf(issue);
issueList.setSelectedIndex(index);
refreshIssue();
}
});
box.setAnimationEnabled(false);
return box;
}
/**
* Create the options panel.
*
* @return the options panel
*/
private Widget createOptionsPanel() {
// Populate a list box containing all issues
for (AbstractIssue issue : issues) {
issueList.addItem(issue.getHeadline());
}
issueList.addChangeHandler(new ChangeHandler() {
public void onChange(ChangeEvent event) {
refreshIssue();
}
});
// Create a button to refresh the current issue
Button refreshIssueButton = new Button("Refresh", new ClickHandler() {
public void onClick(ClickEvent event) {
refreshIssue();
}
});
// Create a suggest box to search for issues
SuggestBox suggestBox = createIssueFinder();
// Create a button to move to the previous issue
Image prevButton = IMAGES.prevButton().createImage();
prevButton.setStyleName("prevButton");
prevButton.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
int selectedIndex = issueList.getSelectedIndex();
if (selectedIndex > 0) {
issueList.setSelectedIndex(selectedIndex - 1);
refreshIssue();
} else {
Window.alert("You are already on the first issue");
}
}
});
// Create a button to move to the next issue
Image nextButton = IMAGES.nextButton().createImage();
nextButton.setStyleName("nextButton");
nextButton.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
int selectedIndex = issueList.getSelectedIndex();
if (selectedIndex < issueList.getItemCount() - 1) {
issueList.setSelectedIndex(selectedIndex + 1);
refreshIssue();
} else {
Window.alert("You are already on the last issue");
}
}
});
// Combine the list box and text into a panel
HorizontalPanel hPanel = new HorizontalPanel();
hPanel.setVerticalAlignment(HasVerticalAlignment.ALIGN_MIDDLE);
hPanel.add(new HTML("Select an issue: "));
hPanel.add(issueList);
hPanel.add(prevButton);
hPanel.add(nextButton);
hPanel.add(refreshIssueButton);
hPanel.add(suggestBox);
SimplePanel wrapper = new SimplePanel();
wrapper.setStyleName("museum-optionsPanel");
wrapper.setWidget(hPanel);
return wrapper;
}
/**
* Refresh the current issue in the issue list.
*/
private void refreshIssue() {
setIssue(issues.get(issueList.getSelectedIndex()));
}
/**
* Set the current issue in the issue container.
*
* @param issue the issue to set
*/
private void setIssue(AbstractIssue issue) {
if (issueLinkElement != null) {
Utility.getHeadElement().removeChild(issueLinkElement);
issueLinkElement = null;
}
// Fetch the associated style sheet using an HTTP request
issueLinkElement = issue.createCSS();
Utility.getHeadElement().appendChild(issueLinkElement);
issueDescription.setHTML(issue.getInstructions());
poller.startPolling(issue);
}
}