ComponentEvent 類應(yīng)該必須處理實(shí)現(xiàn)這個(gè)接口。類的對(duì)象組件注冊(cè)。使用addComponentListener()方法,該對(duì)象可以被注冊(cè)。組件事件提出僅供參考。
以下是聲明 java.awt.event.ComponentListener接口:
public interface ComponentListener extends EventListener
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. |
這個(gè)接口從以下接口繼承的方法:
java.awt.EventListener
選擇使用任何編輯器創(chuàng)建以下java程序在 D:/ > SWING > com > yiibai > gui >
SwingListenerDemo.javapackage 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