HTML formatting by setting the text on a label : JComponent « Swing « Java Tutorial






The components that supported HTML:

  1. JButton,
  2. JLabel,
  3. JMenuItem,
  4. JMenu,
  5. JRadioButtonMenuItem,
  6. JCheckBoxMenuItem,
  7. JTabbedPane,
  8. JToolTip,
  9. JToggleButton,
  10. JCheckBox,
  11. JRadioButton.
HTML formatting by setting the text on a label
/*
 *
 * Copyright (c) 1998 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
 * modify and redistribute this software in source and binary code form,
 * provided that i) this copyright notice and license appear on all copies of
 * the software; and ii) Licensee does not utilize the software in a manner
 * which is disparaging to Sun.
 *
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
 * IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
 * NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
 * LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
 * OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
 * LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
 * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
 * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
 * OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 *
 * This software is not designed or intended for use in on-line control of
 * aircraft, air traffic, aircraft navigation or aircraft communications; or in
 * the design, construction, operation or maintenance of any nuclear
 * facility. Licensee represents and warrants that it will not use or
 * redistribute the Software for such purposes.
 */

import java.awt.Component;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;

import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingConstants;

/* HtmlDemo.java needs no other files. */
public class HtmlDemo extends JPanel implements ActionListener {
  JLabel theLabel;

  JTextArea htmlTextArea;

  public HtmlDemo() {
    setLayout(new BoxLayout(this, BoxLayout.LINE_AXIS));

    String initialText = "<html>\n" + "Color and font test:\n" + "<ul>\n"
        + "<li><font color=red>red</font>\n" + "<li><font color=blue>blue</font>\n"
        + "<li><font color=green>green</font>\n" + "<li><font size=-2>small</font>\n"
        + "<li><font size=+2>large</font>\n" + "<li><i>italic</i>\n" + "<li><b>bold</b>\n"
        + "</ul>\n";

    htmlTextArea = new JTextArea(10, 20);
    htmlTextArea.setText(initialText);
    JScrollPane scrollPane = new JScrollPane(htmlTextArea);

    JButton changeTheLabel = new JButton("Change the label");
    changeTheLabel.setMnemonic(KeyEvent.VK_C);
    changeTheLabel.setAlignmentX(Component.CENTER_ALIGNMENT);
    changeTheLabel.addActionListener(this);

    theLabel = new JLabel(initialText) {
      public Dimension getPreferredSize() {
        return new Dimension(200, 200);
      }

      public Dimension getMinimumSize() {
        return new Dimension(200, 200);
      }

      public Dimension getMaximumSize() {
        return new Dimension(200, 200);
      }
    };
    theLabel.setVerticalAlignment(SwingConstants.CENTER);
    theLabel.setHorizontalAlignment(SwingConstants.CENTER);

    JPanel leftPanel = new JPanel();
    leftPanel.setLayout(new BoxLayout(leftPanel, BoxLayout.PAGE_AXIS));
    leftPanel.setBorder(BorderFactory.createCompoundBorder(BorderFactory
        .createTitledBorder("Edit the HTML, then click the button"), BorderFactory
        .createEmptyBorder(10, 10, 10, 10)));
    leftPanel.add(scrollPane);
    leftPanel.add(Box.createRigidArea(new Dimension(0, 10)));
    leftPanel.add(changeTheLabel);

    JPanel rightPanel = new JPanel();
    rightPanel.setLayout(new BoxLayout(rightPanel, BoxLayout.PAGE_AXIS));
    rightPanel.setBorder(BorderFactory.createCompoundBorder(BorderFactory
        .createTitledBorder("A label with HTML"), BorderFactory.createEmptyBorder(10, 10, 10, 10)));
    rightPanel.add(theLabel);

    setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
    add(leftPanel);
    add(Box.createRigidArea(new Dimension(10, 0)));
    add(rightPanel);
  }

  // React to the user pushing the Change button.
  public void actionPerformed(ActionEvent e) {
    theLabel.setText(htmlTextArea.getText());
  }

  /**
   * Create the GUI and show it. For thread safety, this method should be
   * invoked from the event-dispatching thread.
   */
  private static void createAndShowGUI() {
    // Create and set up the window.
    JFrame frame = new JFrame("HtmlDemo");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    // Create and set up the content pane.
    JComponent newContentPane = new HtmlDemo();
    newContentPane.setOpaque(true); // content panes must be opaque
    frame.setContentPane(newContentPane);

    // Display the window.
    frame.pack();
    frame.setVisible(true);
  }

  public static void main(String[] args) {
    // Schedule a job for the event-dispatching thread:
    // creating and showing this application's GUI.
    javax.swing.SwingUtilities.invokeLater(new Runnable() {
      public void run() {
        createAndShowGUI();
      }
    });
  }
}








14.2.JComponent
14.2.1.JComponent
14.2.2.HTML formatting by setting the text on a labelHTML formatting by setting the text on a label
14.2.3.Listening to Inherited Events of a JComponent from Container and Component
14.2.4.Painting JComponent ObjectsPainting JComponent Objects
14.2.5.how an icon is adapted to a component
14.2.6.A Swing component that computes and displays a fractal image known as a 'Julia set'
14.2.7.Extends JComponent to create drawing pad
14.2.8.A panel that displays a paint sample.