import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JDesktopPane;
import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.JToolBar;
import javax.swing.event.HyperlinkEvent;
import javax.swing.event.HyperlinkListener;
public class MDIWebBrowser extends JFrame {
JDesktopPane desktopPane = new JDesktopPane();
public MDIWebBrowser() {
super("MDI Web Browser");
createNewWindow();
Container contentPane = getContentPane();
contentPane.add(desktopPane);
JMenu fileMenu = new JMenu("File");
fileMenu.add(new NewWindowAction());
fileMenu.addSeparator();
fileMenu.add(new ExitAction());
fileMenu.setMnemonic('F');
JMenuBar menuBar = new JMenuBar();
menuBar.add(fileMenu);
setJMenuBar(menuBar);
}
private void createNewWindow() {
JInternalFrame frame = new JInternalFrame("Browser", // title
true, // resizable
true, // closable
true, // maximizable
true); // iconifiable
WebBrowserPane browserPane = new WebBrowserPane();
WebToolBar toolBar = new WebToolBar(browserPane);
Container contentPane = frame.getContentPane();
contentPane.add(toolBar, BorderLayout.NORTH);
contentPane.add(new JScrollPane(browserPane), BorderLayout.CENTER);
frame.setSize(320, 240);
// move JInternalFrame to prevent it from obscuring others
int offset = 30 * desktopPane.getAllFrames().length;
frame.setLocation(offset, offset);
desktopPane.add(frame);
frame.setVisible(true);
}
private class NewWindowAction extends AbstractAction {
public NewWindowAction() {
putValue(Action.NAME, "New Window");
putValue(Action.SHORT_DESCRIPTION, "Create New Web Browser Window");
putValue(Action.MNEMONIC_KEY, new Integer('N'));
}
public void actionPerformed(ActionEvent event) {
createNewWindow();
}
}
private class ExitAction extends AbstractAction {
public ExitAction() {
// set name, description and mnemonic key
putValue(Action.NAME, "Exit");
putValue(Action.SHORT_DESCRIPTION, "Exit Application");
putValue(Action.MNEMONIC_KEY, new Integer('x'));
}
public void actionPerformed(ActionEvent event) {
System.exit(0);
}
}
public static void main(String args[]) {
MDIWebBrowser browser = new MDIWebBrowser();
browser.setDefaultCloseOperation(EXIT_ON_CLOSE);
browser.setSize(640, 480);
browser.setVisible(true);
}
}
class WebToolBar extends JToolBar implements HyperlinkListener {
private WebBrowserPane webBrowserPane;
private JButton backButton;
private JButton forwardButton;
private JTextField urlTextField;
public WebToolBar(WebBrowserPane browser) {
super("Web Navigation");
webBrowserPane = browser;
webBrowserPane.addHyperlinkListener(this);
urlTextField = new JTextField(25);
urlTextField.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
try {
URL url = new URL(urlTextField.getText());
webBrowserPane.goToURL(url);
}catch (MalformedURLException urlException) {
urlException.printStackTrace();
}
}
});
backButton = new JButton("back");
backButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
URL url = webBrowserPane.back();
urlTextField.setText(url.toString());
}
});
forwardButton = new JButton("forward");
forwardButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
URL url = webBrowserPane.forward();
urlTextField.setText(url.toString());
}
});
add(backButton);
add(forwardButton);
add(urlTextField);
}
public void hyperlinkUpdate(HyperlinkEvent event) {
if (event.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
URL url = event.getURL();
webBrowserPane.goToURL(url);
urlTextField.setText(url.toString());
}
}
}
class WebBrowserPane extends JEditorPane {
private List history = new ArrayList();
private int historyIndex;
public WebBrowserPane() {
setEditable(false);
}
public void goToURL(URL url) {
displayPage(url);
history.add(url);
historyIndex = history.size() - 1;
}
public URL forward() {
historyIndex++;
if (historyIndex >= history.size())
historyIndex = history.size() - 1;
URL url = (URL) history.get(historyIndex);
displayPage(url);
return url;
}
public URL back() {
historyIndex--;
if (historyIndex < 0)
historyIndex = 0;
URL url = (URL) history.get(historyIndex);
displayPage(url);
return url;
}
private void displayPage(URL pageURL) {
try {
setPage(pageURL);
}
catch (IOException ioException) {
ioException.printStackTrace();
}
}
}
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