SWING ComponentListener接口
ComponentEvent 類應該必須處理實現這個接口。類的對象組件註冊。使用addComponentListener()方法，該對象可以被註冊。組件事件提出僅供參考。
接口聲明
以下是聲明 java.awt.event.ComponentListener接口：
public interface ComponentListener extends EventListener
接口方法
S.N.
方法 & 描述
1
void componentHidden(ComponentEvent e)
Invoked when the component has been made invisible.
2
void componentMoved(ComponentEvent e)
Invoked when the component's position changes.
3
void componentResized(ComponentEvent e)
Invoked when the component's size changes.
4
void componentShown(ComponentEvent e)
Invoked when the component has been made visible.
方法繼承
這個接口從以下接口繼承的方法：
- java.awt.EventListener
ComponentListener 例子
選擇使用任何編輯器創建以下java程序在 D:/ > SWING > com > yiibai > gui >
SwingListenerDemo.java
package com.yiibai.gui; import java.awt.*; import java.awt.event.*; import javax.swing.*; public class SwingListenerDemo { private JFrame mainFrame; private JLabel headerLabel; private JLabel statusLabel; private JPanel controlPanel; public SwingListenerDemo(){ prepareGUI(); } public static void main(String[] args){ SwingListenerDemo swingListenerDemo = new SwingListenerDemo(); swingListenerDemo.showComponentListenerDemo(); } private void prepareGUI(){ mainFrame = new JFrame("Java SWING Examples"); 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 showComponentListenerDemo(){ headerLabel.setText("Listener in action: ComponentListener"); JPanel panel = new JPanel(); panel.setBackground(Color.magenta); JLabel msglabel = new JLabel("Welcome to TutorialsPoint SWING Tutorial." ,JLabel.CENTER); panel.add(msglabel); msglabel.addComponentListener(new CustomComponentListener()); controlPanel.add(panel); mainFrame.setVisible(true); } class CustomComponentListener implements ComponentListener { public void componentResized(ComponentEvent e) { statusLabel.setText(statusLabel.getText() + e.getComponent().getClass().getSimpleName() + " resized. "); } public void componentMoved(ComponentEvent e) { statusLabel.setText(statusLabel.getText() + e.getComponent().getClass().getSimpleName() + " moved. "); } public void componentShown(ComponentEvent e) { statusLabel.setText(statusLabel.getText() + e.getComponent().getClass().getSimpleName() + " shown. "); } public void componentHidden(ComponentEvent e) { statusLabel.setText(statusLabel.getText() + e.getComponent().getClass().getSimpleName() + " hidden. "); } } }
編譯程序，使用命令提示符。到 D:/ > SWING 然後輸出以下命令。
D:SWING>javac comyiibaiguiSwingListenerDemo.java
如果沒有錯誤出現，這意味着編譯成功。使用下面的命令來運行程序。
D:SWING>java com.yiibai.gui.SwingListenerDemo
驗證下面的輸出
