helppanel.java

来自「本软件是使用java 开发的」· Java 代码 · 共 61 行

package datastructure;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2004</p>
 * <p>Company: </p>
 * @author unascribed
 * @version 1.0
 */

import java.applet.Applet;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.net.URL;
import java.util.EventObject;
import javax.swing.*;
import javax.swing.event.HyperlinkEvent;
import javax.swing.event.HyperlinkListener;
import javax.swing.text.JTextComponent;

class HelpPanel
    extends JPanel
    implements HyperlinkListener {
  static JEditorPane html;
  static URL url = null;

  public HelpPanel(String s) {
    setLayout(new BorderLayout());
    url = getClass().getResource(s);
    if (url != null) {
      html = new JEditorPane();
      html.setEditable(false);
      linkActivated(url, false);
      html.addHyperlinkListener(this);
      JScrollPane jscrollpane = new JScrollPane();
      JViewport jviewport = jscrollpane.getViewport();
      jviewport.add(html);
      jviewport.setBackingStoreEnabled(true);
      add(jscrollpane, "Center");
    }
  }

  public void showNewHtmlPage(String s) {
    URL url1 = getClass().getResource(s);
    if (url1 != null)
      linkActivated(url1, true);
  }

  public void hyperlinkUpdate(HyperlinkEvent hyperlinkevent) {
    if (hyperlinkevent.getEventType() ==
        javax.swing.event.HyperlinkEvent.EventType.ACTIVATED)
      linkActivated(hyperlinkevent.getURL(), true);
  }

  protected void linkActivated(URL url1, boolean flag) {
    SwingUtilities.invokeLater(new PageLoader(url1, html));
  }

}