package listener;

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

//應用窗口接收器和動作接收器
public class WindowListenerFrame extends JFrame
    implements ActionListener, WindowListener {

  //聲明JPanel容器類
  JPanel contentPane;
  //聲明窗口
  JFrame listenerFrame;
  //創建BorderLayout布局
  BorderLayout borderLayout1 = new BorderLayout();
  //創建JTextArea控件
  JTextArea jTextArea1 = new JTextArea();
  //創建JPanel容器類
  JPanel jPanel1 = new JPanel();
  //創建2個按鈕
  JButton jButton1 = new JButton();
  JButton jButton2 = new JButton();

  public static void main(String[] args) {
    //創建本類的窗口類
    WindowListenerFrame frame = new WindowListenerFrame();
    frame.setVisible(true);
  }

  //窗口類構造器
  public WindowListenerFrame() {
    jbInit();
  }
  

  private void jbInit() {
    contentPane = (JPanel)this.getContentPane();
    contentPane.setLayout(borderLayout1);
    this.setSize(new Dimension(400, 300));
    this.setTitle("窗口接收器示例1");
    //設置按鈕的屬性
    jButton1.setText("顯示窗口");
    jButton1.setActionCommand("show");
    jButton2.setText("清空內容");
    jButton2.setActionCommand("clear");
    //為按鈕加入動作接收器
    jButton1.addActionListener(this);
    jButton2.addActionListener(this);
    //將文本框設為不可編寫
    jTextArea1.setEditable(false); 
    //創建帶有窗口接收器的窗口
    listenerFrame = new JFrame("窗口事件演示");
    //加入窗口接收器
    listenerFrame.addWindowListener(this); 
    //設置窗口的大小
    listenerFrame.setSize(new Dimension(460, 100)); 
    //為窗口加入標簽控件
    JLabel jLabel1 = new JLabel("   窗口接收器，包括打開、關閉、激活、不激活、" 
        + "最小化及恢復顯示等事件.");
    listenerFrame.getContentPane().add(jLabel1, BorderLayout.CENTER);

    //為按鈕面板加入按鈕
    jPanel1.add(jButton1, null);
    jPanel1.add(jButton2, null);
    //為窗口面板加入控件
    contentPane.add(jTextArea1, BorderLayout.CENTER);
    contentPane.add(jPanel1, BorderLayout.SOUTH);
  }

  //當退出主窗口的時，使用System.exit命令清除內存
  protected void processWindowEvent(WindowEvent e) {
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      System.exit(0);
    }
  }

  //單擊按鈕的處理代碼
  public void actionPerformed(ActionEvent e) {
    if (e.getActionCommand() == "show") { 
      //顯示帶有窗口接收器的窗口
      listenerFrame.setVisible(true);
    }
    else { 
      //清空文本框
      jTextArea1.setText("");
    }
  }

  //窗口正在關閉的處理代碼
  public void windowClosing(WindowEvent e) {
    listenerFrame.setVisible(false);
    displayMessage("窗口正在關閉", e);
  }
  //窗口已經關閉的處理代碼
  public void windowClosed(WindowEvent e) {
    displayMessage("窗口已經關閉", e);
  }
  //窗口打開的處理代碼
  public void windowOpened(WindowEvent e) {
    displayMessage("窗口已經打開", e);
  }
  //窗口圖標化的處理代碼
  public void windowIconified(WindowEvent e) {
    displayMessage("窗口最小化", e);
  }
  //窗口恢復顯示的處理代碼
  public void windowDeiconified(WindowEvent e) {
    displayMessage("窗口恢復顯示", e);
  }
  //窗口激活的處理代碼
  public void windowActivated(WindowEvent e) {
    displayMessage("窗口激活", e);
  }
  //窗口不激活的處理代碼
  public void windowDeactivated(WindowEvent e) {
    displayMessage("窗口不激活", e);
  }
  //各種窗口事件的信息顯示方法
  void displayMessage(String prefix, WindowEvent e) {
    jTextArea1.append(prefix + "\n");
  }
}