/*
* Copyright (c) 2008 Patrick Wright
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the
* as published by the Free Software Foundation; either version 2.1
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
import org.w3c.dom.Document;
import org.xhtmlrenderer.event.DefaultDocumentListener;
import org.xhtmlrenderer.extend.UserAgentCallback;
import org.xhtmlrenderer.resource.XMLResource;
import org.xhtmlrenderer.simple.FSScrollPane;
import org.xhtmlrenderer.simple.XHTMLPanel;
import org.xhtmlrenderer.swing.DelegatingUserAgent;
import org.xhtmlrenderer.swing.ImageResourceLoader;
import org.xhtmlrenderer.swing.SwingReplacedElementFactory;
import org.xhtmlrenderer.util.GeneralUtil;
import javax.swing.*;
import java.awt.*;
import java.io.File;
import java.io.StringReader;
import java.net.MalformedURLException;
import java.net.URL;
/**
* This example shows the most basic use of Flying Saucer, to
* display a single page, scrollable, within a JFrame. The input
* is a file name.
*
* @author Patrick Wright
*/
public class BrowsePanel {
private String uri;
private XHTMLPanel panel;
private JFrame frame;
private UserAgentCallback uac;
public static void main(String[] args) throws Exception {
try {
new BrowsePanel().run(args);
} catch (IllegalArgumentException e) {
System.err.println(e.getMessage());
}
}
private void run(String[] args) {
loadAndCheckArgs(args);
EventQueue.invokeLater(new Runnable() {
public void run() {
// Create a JPanel subclass to render the page
panel = new XHTMLPanel();
setupDocumentListener(panel);
setupUserAgentCallback(panel);
// Put our panel in a scrolling pane. You can use
// a regular JScrollPane here, or our FSScrollPane.
// FSScrollPane is already set up to move the correct
// amount when scrolling 1 line or 1 page
FSScrollPane scroll = new FSScrollPane(panel);
frame = new JFrame("Flying Saucer");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(scroll);
frame.pack();
frame.setSize(1024, 768);
frame.setVisible(true);
launchLoad();
}
});
}
private void setupUserAgentCallback(XHTMLPanel panel) {
uac = new DelegatingUserAgent();
ImageResourceLoader irl = new ImageResourceLoader();
irl.setRepaintListener(panel);
((DelegatingUserAgent) uac).setImageResourceLoader(irl);
panel.getSharedContext().setUserAgentCallback(uac);
panel.getSharedContext().setReplacedElementFactory(new SwingReplacedElementFactory(panel, irl));
}
private void setupDocumentListener(final XHTMLPanel panel) {
panel.addDocumentListener(new DefaultDocumentListener() {
public void documentStarted() {
panel.setCursor(new Cursor(Cursor.WAIT_CURSOR));
super.documentStarted();
}
public void documentLoaded() {
panel.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
frame.setTitle(panel.getDocumentTitle());
}
public void onLayoutException(Throwable t) {
panel.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
panel.setDocument(getErrorDocument("can't layout: " + t.getMessage()).getDocument());
}
public void onRenderException(Throwable t) {
panel.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
panel.setDocument(getErrorDocument("can't render: " + t.getMessage()).getDocument());
}
});
}
private XMLResource getErrorDocument(String reason) {
XMLResource xr;
String cleanUri = GeneralUtil.escapeHTML(uri);
String notFound = "<html><h1>Document not found</h1><p>Could not load URI <pre>" + cleanUri + "</pre>, because: " + reason + "</p></html>";
xr = XMLResource.load(new StringReader(notFound));
return xr;
}
private void launchLoad() {
new Thread(new Runnable() {
public void run() {
final Document doc;
try {
if (panel != null ) panel.setCursor(new Cursor(Cursor.WAIT_CURSOR));
doc = getUAC().getXMLResource(uri).getDocument();
} catch (Exception e) {
e.printStackTrace();
System.err.println("Can't load document");
return;
} finally {
if (panel != null ) panel.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
}
EventQueue.invokeLater(new Runnable() {
public void run() {
startRender(doc);
}
});
}
}).start();
}
private UserAgentCallback getUAC() {
return uac;
}
private void startRender(final Document document) {
// first, load the document, so we can trap any parse errors
// in loading;
// Set the XHTML document to render. We use the simplest form
// of the API call, which uses a File reference. There
// are a variety of overloads for setDocument().
try {
panel.setDocument(document, uri);
}
catch (Exception e) {
e.printStackTrace();
}
}
private void loadAndCheckArgs(String[] args) {
if (args.length == 0) {
throw new IllegalArgumentException("Enter a file or URI.");
}
String name = args[0];
if (!new File(name).exists()) {
try {
new URL(name);
} catch (MalformedURLException e) {
throw new IllegalArgumentException("File " + name + " does not exist or is not a URI");
}
}
this.uri = name;
}
}