pageframe.java

java swing 开发代码

// PageFrame.java
// A simple extension of the JInternalFrame class that contains a list
// object.  Elements of the list represent HTML pages for a web site.
//
package	jswing.ch02;

 
import java.awt.*;
import java.io.*;
import java.awt.event.*;
import javax.swing.*;

public class PageFrame extends JInternalFrame implements ActionListener {

  SiteManager parent;
  String filename;
  JTextArea ta;

  public PageFrame(String name, SiteManager sm) {
    super("Page: " + name, true, true, true, true);
    parent = sm;
    setBounds(50,50,300,150);

    Container contentPane = getContentPane();

    // Create a text area to display the contents of our file in
    // and stick it in a scrollable pane so we can see everything
    ta = new JTextArea();
    JScrollPane jsp = new JScrollPane(ta);
    contentPane.add(jsp, BorderLayout.CENTER);

    JMenuBar jmb = new JMenuBar();
    JMenu fileMenu = new JMenu("File");
    JMenuItem saveItem = new JMenuItem("Save");
    saveItem.addActionListener(this);
    fileMenu.add(saveItem);
    jmb.add(fileMenu);
    setJMenuBar(jmb);

    filename = name;
    loadContent();
  }

  public void actionPerformed(ActionEvent ae) {
    // Can only be the save menu
    saveContent();
  }

  public void loadContent() {
    try {
      FileReader fr = new FileReader(filename);
      ta.read(fr, null);
      fr.close();
    }
    catch (Exception e) {
      System.err.println("Could not load page: " + filename);
    }
  }

  public void saveContent() {
    try {
      FileWriter fw = new FileWriter(filename);
      ta.write(fw);
      fw.close();
    }
    catch(Exception e) {
      System.err.println("Could not save page: " + filename);
    }
  }

  public void cutText() { ta.cut(); }
  public void copyText() { ta.copy(); }
  public void pasteText() { ta.paste(); }
}