AWT MouseListener类
1 什么是Java AWT MouseListener
处理 MouseEvent 的类应该实现这个接口。该类的对象必须注册到一个组件中。可以使用 addMouseListener() 方法注册该对象。
2 Java AWT MouseListener的语法
public interface MouseListener
extends EventListener
3 Java AWT MouseListener的方法
方法 | 描述 |
---|---|
void mouseClicked(MouseEvent e) | 在组件上单击(按下和释放)鼠标按钮时调用。 |
void mouseEntered(MouseEvent e) | 当鼠标进入组件时调用。 |
void mouseExited(MouseEvent e) | 当鼠标退出组件时调用。 |
void mousePressed(MouseEvent e) | 在组件上按下鼠标按钮时调用。 |
void mouseReleased(MouseEvent e) | 在组件上释放鼠标按钮时调用。 |
4 Java AWT MouseListener的例子
让我们看一个简单的Java AWT MouseListener类示例。
package com.yiidian;
import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class AwtListenerDemo {
private Frame mainFrame;
private Label headerLabel;
private Label statusLabel;
private Panel controlPanel;
public AwtListenerDemo(){
prepareGUI();
}
public static void main(String[] args){
AwtListenerDemo awtListenerDemo = new AwtListenerDemo();
awtListenerDemo.showMouseListenerDemo();
}
private void prepareGUI(){
mainFrame = new Frame("一点教程网:Java AWT Examples");
mainFrame.setSize(400,400);
mainFrame.setLayout(new GridLayout(3, 1));
mainFrame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent windowEvent){
System.exit(0);
}
});
headerLabel = new Label();
headerLabel.setAlignment(Label.CENTER);
statusLabel = new Label();
statusLabel.setAlignment(Label.CENTER);
statusLabel.setSize(350,100);
controlPanel = new Panel();
controlPanel.setLayout(new FlowLayout());
mainFrame.add(headerLabel);
mainFrame.add(controlPanel);
mainFrame.add(statusLabel);
mainFrame.setVisible(true);
}
private void showMouseListenerDemo(){
headerLabel.setText("Listener in action: MouseListener");
Panel panel = new Panel();
panel.setBackground(Color.magenta);
panel.setLayout(new FlowLayout());
panel.addMouseListener(new CustomMouseListener());
Label msglabel = new Label();
msglabel.setAlignment(Label.CENTER);
msglabel.setText("Welcome to yiidian.com AWT Tutorial.");
msglabel.addMouseListener(new CustomMouseListener());
panel.add(msglabel);
controlPanel.add(panel);
mainFrame.setVisible(true);
}
class CustomMouseListener implements MouseListener {
public void mouseClicked(MouseEvent e) {
statusLabel.setText("Mouse Clicked: ("
+e.getX()+", "+e.getY() +")");
}
public void mousePressed(MouseEvent e) {
}
public void mouseReleased(MouseEvent e) {
}
public void mouseEntered(MouseEvent e) {
}
public void mouseExited(MouseEvent e) {
}
}
}
输出结果为:
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