This program demonstrates how to display HTML documents in an editor pane.
/*
This program is a part of the companion code for Core Java 8th ed.
(http://horstmann.com/corejava)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.util.Stack;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.event.HyperlinkEvent;
import javax.swing.event.HyperlinkListener;
/**
* This program demonstrates how to display HTML documents in an editor pane.
* @version 1.03 2007-08-01
* @author Cay Horstmann
*/
public class EditorPaneTest
{
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
JFrame frame = new EditorPaneFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
});
}
}
/**
* This frame contains an editor pane, a text field and button to enter a URL and load a document,
* and a Back button to return to a previously loaded document.
*/
class EditorPaneFrame extends JFrame
{
public EditorPaneFrame()
{
setTitle("EditorPaneTest");
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
final Stack<String> urlStack = new Stack<String>();
final JEditorPane editorPane = new JEditorPane();
final JTextField url = new JTextField(30);
// set up hyperlink listener
editorPane.setEditable(false);
editorPane.addHyperlinkListener(new HyperlinkListener()
{
public void hyperlinkUpdate(HyperlinkEvent event)
{
if (event.getEventType() == HyperlinkEvent.EventType.ACTIVATED)
{
try
{
// remember URL for back button
urlStack.push(event.getURL().toString());
// show URL in text field
url.setText(event.getURL().toString());
editorPane.setPage(event.getURL());
}
catch (IOException e)
{
editorPane.setText("Exception: " + e);
}
}
}
});
// set up checkbox for toggling edit mode
final JCheckBox editable = new JCheckBox();
editable.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
editorPane.setEditable(editable.isSelected());
}
});
// set up load button for loading URL
ActionListener listener = new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
try
{
// remember URL for back button
urlStack.push(url.getText());
editorPane.setPage(url.getText());
}
catch (IOException e)
{
editorPane.setText("Exception: " + e);
}
}
};
JButton loadButton = new JButton("Load");
loadButton.addActionListener(listener);
url.addActionListener(listener);
// set up back button and button action
JButton backButton = new JButton("Back");
backButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
if (urlStack.size() <= 1) return;
try
{
// get URL from back button
urlStack.pop();
// show URL in text field
String urlString = urlStack.peek();
url.setText(urlString);
editorPane.setPage(urlString);
}
catch (IOException e)
{
editorPane.setText("Exception: " + e);
}
}
});
add(new JScrollPane(editorPane), BorderLayout.CENTER);
// put all control components in a panel
JPanel panel = new JPanel();
panel.add(new JLabel("URL"));
panel.add(url);
panel.add(loadButton);
panel.add(backButton);
panel.add(new JLabel("Editable"));
panel.add(editable);
add(panel, BorderLayout.SOUTH);
}
private static final int DEFAULT_WIDTH = 600;
private static final int DEFAULT_HEIGHT = 400;
}
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