处理WindowEvent
的类应该实现此接口。该类的对象必须在组件中注册。可以使用addWindowListener()
方法注册该对象。
接口声明
以下是java.awt.event.WindowListener
接口的声明 -
public interface WindowListener
extends EventListener
接口方法
编号 | 方法 | 描述说明 |
---|---|---|
1 | void windowActivated(WindowEvent e) |
将Window设置为活动Window时调用。 |
2 | void windowClosed(WindowEvent e) |
由于在Window上调用丢弃而关闭窗口时调用。 |
3 | void windowClosing(WindowEvent e) |
当用户尝试从Window的系统菜单关闭Window时调用。 |
4 | void windowDeactivated(WindowEvent e) |
当Window不再是活动Window时调用。 |
5 | void windowDeiconified(WindowEvent e) |
当窗口从最小化状态更改为正常状态时调用。 |
6 | void windowIconified(WindowEvent e) |
当Window从正常状态更改为最小化状态时调用。 |
7 | void windowOpened(WindowEvent e) |
第一次使窗口可见时调用。 |
方法继承
此接口从以下接口继承方法 -
java.awt.EventListener
WindowListener示例
使用编辑器创建以下Java程序: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示例(yiibai.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示例");
aboutFrame.addWindowListener(new CustomWindowListener());
JPanel panel = new JPanel();
panel.setBackground(Color.white);
JLabel msglabel = new JLabel("欢迎您来到易百Swing教程"
,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) {
}
}
}
执行上面示例代码,得到以下结果: