JEditorPane and the Swing HTML Package 7 : Text EditorPane « Swing JFC « Java

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Java » Swing JFC » Text EditorPaneScreenshots 
JEditorPane and the Swing HTML Package 7
JEditorPane and the Swing HTML Package 7
   
/*
Core SWING Advanced Programming 
By Kim Topley
ISBN: 0 13 083292 8       
Publisher: Prentice Hall  
*/

import java.awt.Color;
import java.awt.Cursor;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.File;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.net.URL;

import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.text.EditorKit;

public class EditorPaneExample7 extends JFrame {
  public EditorPaneExample7() {
    super("JEditorPane Example 7");

    pane = new JEditorPane();
    pane.setEditable(false)// Start read-only
    getContentPane().add(new JScrollPane(pane)"Center");

    // Build the panel of controls
    JPanel panel = new JPanel();

    panel.setLayout(new GridBagLayout());
    GridBagConstraints c = new GridBagConstraints();
    c.gridwidth = 1;
    c.gridheight = 1;
    c.anchor = GridBagConstraints.EAST;
    c.fill = GridBagConstraints.NONE;
    c.weightx = 0.0;
    c.weighty = 0.0;

    JLabel urlLabel = new JLabel("File name: ", JLabel.RIGHT);
    panel.add(urlLabel, c);
    JLabel loadingLabel = new JLabel("State: ", JLabel.RIGHT);
    c.gridy = 1;
    panel.add(loadingLabel, c);
    JLabel typeLabel = new JLabel("Type: ", JLabel.RIGHT);
    c.gridy = 2;
    panel.add(typeLabel, c);

    c.gridx = 1;
    c.gridy = 0;
    c.gridwidth = 1;
    c.weightx = 1.0;
    c.fill = GridBagConstraints.HORIZONTAL;

    textField = new JTextField(32);
    panel.add(textField, c);
    loadingState = new JLabel(spaces, JLabel.LEFT);
    loadingState.setForeground(Color.black);
    c.gridy = 1;
    c.gridwidth = 2;
    panel.add(loadingState, c);
    loadedType = new JLabel(spaces, JLabel.LEFT);
    loadedType.setForeground(Color.black);
    c.gridy = 2;
    panel.add(loadedType, c);

    getContentPane().add(panel, "South");

    panel = new JPanel();
    panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));

    saveButton = new JButton("Save");
    plain = new JCheckBox("Plain Text");
    html new JCheckBox("HTML");
    rtf = new JCheckBox("RTF");
    panel.add(plain);
    panel.add(html);
    panel.add(rtf);

    ButtonGroup group = new ButtonGroup();
    group.add(plain);
    group.add(html);
    group.add(rtf);
    plain.setSelected(true);

    panel.add(Box.createVerticalStrut(10));
    panel.add(saveButton);
    panel.add(Box.createVerticalGlue());
    panel.setBorder(BorderFactory.createEmptyBorder(2424));

    getContentPane().add(panel, "East");

    // Change page based on text field
    textField.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent evt) {
        String fileName = textField.getText().trim();
        file = new File(fileName);
        absolutePath = file.getAbsolutePath();
        String url = "file:///" + absolutePath;

        try {
          // Check if the new page and the old
          // page are the same.
          URL newURL = new URL(url);
          URL loadedURL = pane.getPage();
          if (loadedURL != null && loadedURL.sameFile(newURL)) {
            return;
          }

          // Try to display the page
          textField.setEnabled(false)// Disable input
          textField.paintImmediately(00, textField.getSize().width,
              textField.getSize().height);

          saveButton.setEnabled(false);
          saveButton.paintImmediately(00,
              saveButton.getSize().width,
              saveButton.getSize().height);
          setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
          // Busy cursor
          loadingState.setText("Loading...");
          loadingState.paintImmediately(00,
              loadingState.getSize().width, loadingState
                  .getSize().height);
          loadedType.setText("");
          loadedType.paintImmediately(00,
              loadedType.getSize().width,
              loadedType.getSize().height);
          pane.setEditable(false);
          pane.setPage(url);

          loadedType.setText(pane.getContentType());
        catch (Exception e) {
          JOptionPane.showMessageDialog(pane, new String[] {
              "Unable to open file", url }"File Open Error",
              JOptionPane.ERROR_MESSAGE);
          loadingState.setText("Failed");
          textField.setEnabled(true);
          setCursor(Cursor.getDefaultCursor());
        }
      }
    });

    // Listen for page load to complete
    pane.addPropertyChangeListener(new PropertyChangeListener() {
      public void propertyChange(PropertyChangeEvent evt) {
        if (evt.getPropertyName().equals("page")) {
          loadingState.setText("Page loaded.");

          textField.setEnabled(true)// Allow entry of new file name
          textField.requestFocus();
          setCursor(Cursor.getDefaultCursor());

          // Allow editing and saving if appropriate
          pane.setEditable(file.canWrite());
          saveButton.setEnabled(file.canWrite());
        }
      }
    });

    saveButton.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent evt) {
        Writer w = null;
        OutputStream os = System.out;
        String contentType;
        if (plain.isSelected()) {
          contentType = "text/plain";
          w = new OutputStreamWriter(os);
        else if (html.isSelected()) {
          contentType = "text/html";
          w = new OutputStreamWriter(os);
        else {
          contentType = "text/rtf";
        }

        EditorKit kit = pane.getEditorKitForContentType(contentType);
        try {
          if (w != null) {
            kit.write(w, pane.getDocument()0, pane.getDocument()
                .getLength());
            w.flush();
          else {
            kit.write(os, pane.getDocument()0, pane.getDocument()
                .getLength());
            os.flush();
          }
        catch (Exception e) {
          System.out.println("Write failed");
        }
      }
    });
  }

  public static void main(String[] args) {
    try {
        UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
    catch (Exception evt) {}
  
    JFrame f = new EditorPaneExample7();
    f.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent evt) {
        System.exit(0);
      }
    });
    f.setSize(500400);
    f.setVisible(true);
  }

  private static final String spaces = "                    ";

  private JEditorPane pane;

  private JTextField textField;

  private JLabel loadingState;

  private JLabel loadedType;

  private JButton saveButton;

  private JCheckBox plain;

  private JCheckBox html;

  private JCheckBox rtf;

  private File file;

  private String absolutePath;
}


           
         
    
    
  
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