焦點事件FocusEvent JTextArea自動換行

 

 

//FocusEvent1.java
//焦點事件，前一版本中txt1不能自動換行，加入了自動換行。
//2099-11-15 V0.2

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

public class FocusEvent1 extends JFrame
{
 FocusEvent1(String title){
  super(title);
 }
 JButton button1=new JButton("button1");
 JButton button2=new JButton("button2");
 JTextArea txt1=new JTextArea(null,5,20);
 
 JTextField txt2=new JTextField(20);
 
 JScrollPane sh=new JScrollPane(txt1,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
  JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);

 class KeyTry implements FocusListener
 {
  public void focusGained(FocusEvent e){      //焦點獲得
   txt1.setText("txt1:paramString()="+e.paramString());
   txt2.setText("txt2:focus gained in button1 or txt1");
  }
  public void focusLost(FocusEvent e){      //焦點失去
   txt1.setText("txt1:paramString()="+e.paramString());
   txt2.setText("txt2:focus losed in button1 or txt1");
  }
 }

 KeyTry keyTry=new KeyTry();
 public void init(){
  Container cp=getContentPane();
  cp.setLayout(new FlowLayout());
  button1.addFocusListener(keyTry);
  cp.add(button1);
  cp.add(button2);
  txt1.addFocusListener(keyTry);
  txt1.setLineWrap(true);            //txt1自動換行
  cp.add(sh);
  cp.add(txt2);
 }
 
 public static void main(String[] args){
  FocusEvent1 focusEvent=new FocusEvent1("Focus Event");
  focusEvent.init();
  focusEvent.setSize(240,180);
  focusEvent.setVisible(true);
  focusEvent.addWindowListener(new WindowClose()); 
 } 
}

class WindowClose extends WindowAdapter
{
 public void windowClosing(WindowEvent e){
  System.exit(0);
 }
}