Swing WindowListener介面

處理WindowEvent的類應該實現此介面。該類的物件必須在元件中註冊。可以使用addWindowListener()方法註冊該物件。

介面宣告

以下是java.awt.event.WindowListener介面的宣告 -

public interface WindowListener
   extends EventListener

介面方法

編號	方法	描述說明
1	`void windowActivated(WindowEvent e)`	將Window設定為活動Window時呼叫。
2	`void windowClosed(WindowEvent e)`	由於在Window上呼叫丟棄而關閉視窗時呼叫。
3	`void windowClosing(WindowEvent e)`	當使用者嘗試從Window的系統選單關閉Window時呼叫。
4	`void windowDeactivated(WindowEvent e)`	當Window不再是活動Window時呼叫。
5	`void windowDeiconified(WindowEvent e)`	當視窗從最小化狀態更改為正常狀態時呼叫。
6	`void windowIconified(WindowEvent e)`	當Window從正常狀態更改為最小化狀態時呼叫。
7	`void windowOpened(WindowEvent e)`	第一次使視窗可見時呼叫。

方法繼承

此介面從以下介面繼承方法 -

java.awt.EventListener

WindowListener範例

使用編輯器建立以下Java程式：WindowListenerDemo.java

package com.yiibai.swing.listener;


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

public class WindowListenerDemo {
   private JFrame aboutFrame;
   private JFrame mainFrame;
   private JLabel headerLabel;
   private JLabel statusLabel;
   private JPanel controlPanel;

   public WindowListenerDemo(){
      prepareGUI();
   }
   public static void main(String[] args){
       WindowListenerDemo  swingListenerDemo = new WindowListenerDemo();  
      swingListenerDemo.showWindowListenerDemo();
   }
   private void prepareGUI(){
      mainFrame = new JFrame("Java SWING WindowListener範例(tw511.com)");
      mainFrame.setSize(400,400);
      mainFrame.setLayout(new GridLayout(3, 1));

      headerLabel = new JLabel("",JLabel.CENTER );
      statusLabel = new JLabel("",JLabel.CENTER);        
      statusLabel.setSize(350,100);

      mainFrame.addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent windowEvent){
            System.exit(0);
         }        
      });    
      controlPanel = new JPanel();
      controlPanel.setLayout(new FlowLayout());

      mainFrame.add(headerLabel);
      mainFrame.add(controlPanel);
      mainFrame.add(statusLabel);
      mainFrame.setVisible(true);  
   }
   private void showWindowListenerDemo(){
      headerLabel.setText("Listener in action: WindowListener");      
      JButton okButton = new JButton("OK");

      aboutFrame = new JFrame();
      aboutFrame.setSize(300,200);;
      aboutFrame.setTitle("WindowListener範例");
      aboutFrame.addWindowListener(new CustomWindowListener());

      JPanel panel = new JPanel();      
      panel.setBackground(Color.white);            
      JLabel msglabel = new JLabel("歡迎您來到易百Swing教學"
         ,JLabel.CENTER);        
      panel.add(msglabel);
      aboutFrame.add(panel);
      aboutFrame.setVisible(true); 
   }
   class CustomWindowListener implements WindowListener {
      public void windowOpened(WindowEvent e) {
      }
      public void windowClosing(WindowEvent e) {
         aboutFrame.dispose();
      }
      public void windowClosed(WindowEvent e) {
      }
      public void windowIconified(WindowEvent e) {
      }
      public void windowDeiconified(WindowEvent e) {
      }
      public void windowActivated(WindowEvent e) {
      }
      public void windowDeactivated(WindowEvent e) {
      }
   }   
}

執行上面範例程式碼，得到以下結果：

WindowListener示例