TextFields.java

//: c13:TextFields.java
// From 'Thinking in Java, 2nd ed.' by Bruce Eckel
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
// Text fields and Java events.
// <applet code=TextFields width=375
// height=125></applet>
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;
import java.awt.*;
import java.awt.event.*;
import com.bruceeckel.swing.*;

public class TextFields extends JApplet {
  JButton
    b1 = new JButton("Get Text"),
    b2 = new JButton("Set Text");
  JTextField
    t1 = new JTextField(30),
    t2 = new JTextField(30),
    t3 = new JTextField(30);
  String s = new String();
  UpperCaseDocument
    ucd = new UpperCaseDocument();
  public void init() {
    t1.setDocument(ucd);
    ucd.addDocumentListener(new T1());
    b1.addActionListener(new B1());
    b2.addActionListener(new B2());
    DocumentListener dl = new T1();
    t1.addActionListener(new T1A());
    Container cp = getContentPane();
    cp.setLayout(new FlowLayout());
    cp.add(b1);
    cp.add(b2);
    cp.add(t1);
    cp.add(t2);
    cp.add(t3);
  }
  class T1 implements DocumentListener {
    public void changedUpdate(DocumentEvent e){}
    public void insertUpdate(DocumentEvent e){
      t2.setText(t1.getText());
      t3.setText("Text: "+ t1.getText());
    }
    public void removeUpdate(DocumentEvent e){
      t2.setText(t1.getText());
    }
  }
  class T1A implements ActionListener {
    private int count = 0;
    public void actionPerformed(ActionEvent e) {
      t3.setText("t1 Action Event " + count++);
    }
  }
  class B1 implements ActionListener {
    public void actionPerformed(ActionEvent e) {
      if(t1.getSelectedText() == null)
        s = t1.getText();
      else
        s = t1.getSelectedText();
      t1.setEditable(true);
    }
  }
  class B2 implements ActionListener {
    public void actionPerformed(ActionEvent e) {
      ucd.setUpperCase(false);
      t1.setText("Inserted by Button 2: " + s);
      ucd.setUpperCase(true);
      t1.setEditable(false);
    }
  }
  public static void main(String[] args) {
    Console.run(new TextFields(), 375, 125);
  }
}

class UpperCaseDocument extends PlainDocument {
  boolean upperCase = true;
  public void setUpperCase(boolean flag) {
    upperCase = flag;
  }
  public void insertString(int offset, 
    String string, AttributeSet attributeSet)
    throws BadLocationException {
      if(upperCase)
        string = string.toUpperCase();
      super.insertString(offset, 
        string, attributeSet);
  }
} ///:~