JEditorPane Example

[Java Tip]

Code:

import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
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;

public class EditorPaneTest {
  public static void main(String[] args) {
    JFrame frame = new EditorPaneFrame();
    frame.show();
  }
}

class EditorPaneFrame extends JFrame {
  public EditorPaneFrame() {
    setTitle("EditorPaneTest");
    setSize(600, 400);
    addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });

    // set up text field and load button for typing in URL

    url = new JTextField(30);

    loadButton = new JButton("Load");
    loadButton.addActionListener(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("Error: " + e);
        }
      }
    });

    // set up back button and button action

    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 = (String) urlStack.peek();
          url.setText(urlString);

          editorPane.setPage(urlString);
        } catch (IOException e) {
          editorPane.setText("Error: " + e);
        }
      }
    });

    // set up editor pane and hyperlink listener

    editorPane = new JEditorPane();
    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("Error: " + e);
          }
        }
      }
    });

    // set up checkbox for toggling edit mode

    editable = new JCheckBox();
    editable.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent event) {
        editorPane.setEditable(editable.isSelected());
      }
    });

    Container contentPane = getContentPane();
    contentPane.add(new JScrollPane(editorPane), "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);

    contentPane.add(panel, "South");
  }

  private JTextField url;

  private JCheckBox editable;

  private JButton loadButton;

  private JButton backButton;

  private JEditorPane editorPane;

  private Stack urlStack = new Stack();
}