求大家帮助修改下
修改例W14E6，使得当鼠标在窗口中点击任何位置时，都会将按钮放在以点击位置为中心的位置，并在文本域中显示中心位置的坐标。import java.awt.*;
import java.awt.event.*;
import javax.swing.SwingUtilities;
public class W14E6{
public static void main(String[] args) {
MyWindow myWin = new MyWindow("鼠标运动事件测试");
}
}
class MyWindow extends Frame implements MouseMotionListener{
Button b;
TextArea ta;
MyWindow(String s){
super(s);
setLayout(new FlowLayout());
setBounds(200, 100, 600, 300);
b = new Button("按钮");
add(b);
ta = new TextArea();
add(ta);
b.addMouseMotionListener(this);
ta.addMouseMotionListener(this);
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
setVisible(true);
}
public void mouseDragged(MouseEvent e){
int x,y,w,h;
Component c = (Component)e.getSource();
e = SwingUtilities.convertMouseEvent(c,e,this);
x = e.getX();
y = e.getY();
w=c.getSize().width;
h=c.getSize().height;
c.setLocation(x-w/2,y-h/2);
}
public void mouseMoved(MouseEvent e){}
}
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没分啊 〉？？？
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程序代码：
package com.guigu.guo.main;
import java.awt.*;
import java.awt.event.*;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
public class W14E6
{
public static void main(String[] args)
{
MyWindow myWin = new MyWindow("鼠标运动事件测试");
}
}
class MyWindow extends JFrame implements MouseListener
{
JButton b;
JTextArea ta;
JPanel panel;
MyWindow(String s)
{
super(s);
this.setLayout(new BorderLayout());
this.setSize(600, 500);
this.setLocationRelativeTo(null);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
panel=new JPanel();
panel.setLayout(null);
b = new JButton("按钮");
b.setBounds(20, 20, 60, 30);
ta = new JTextArea();
ta.setRows(5);
this.getContentPane().add(ta,BorderLayout.NORTH);
this.getContentPane().add(panel,BorderLayout.CENTER);
panel.add(b);
panel.addMouseListener(this);
setVisible(true);
}
@Override
public void mouseClicked(MouseEvent arg0)
{
// TODO Auto-generated method stub
}
@Override
public void mouseEntered(MouseEvent arg0)
{
// TODO Auto-generated method stub
}
@Override
public void mouseExited(MouseEvent arg0)
{
// TODO Auto-generated method stub
}
@Override
public void mousePressed(MouseEvent e)
{
int x=e.getPoint().x;
int y=e.getPoint().y;
ta.setText("中心位置的坐标是：（"+x+","+y+")");
int h=b.getSize().height;
int w=b.getSize().width;
b.setLocation(x-w/2,y-h/2);
}
@Override
public void mouseReleased(MouseEvent arg0)
{
// TODO Auto-generated method stub
}
}
import java.awt.*;
import java.awt.event.*;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
public class W14E6
{
public static void main(String[] args)
{
MyWindow myWin = new MyWindow("鼠标运动事件测试");
}
}
class MyWindow extends JFrame implements MouseListener
{
JButton b;
JTextArea ta;
JPanel panel;
MyWindow(String s)
{
super(s);
this.setLayout(new BorderLayout());
this.setSize(600, 500);
this.setLocationRelativeTo(null);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
panel=new JPanel();
panel.setLayout(null);
b = new JButton("按钮");
b.setBounds(20, 20, 60, 30);
ta = new JTextArea();
ta.setRows(5);
this.getContentPane().add(ta,BorderLayout.NORTH);
this.getContentPane().add(panel,BorderLayout.CENTER);
panel.add(b);
panel.addMouseListener(this);
setVisible(true);
}
@Override
public void mouseClicked(MouseEvent arg0)
{
// TODO Auto-generated method stub
}
@Override
public void mouseEntered(MouseEvent arg0)
{
// TODO Auto-generated method stub
}
@Override
public void mouseExited(MouseEvent arg0)
{
// TODO Auto-generated method stub
}
@Override
public void mousePressed(MouseEvent e)
{
int x=e.getPoint().x;
int y=e.getPoint().y;
ta.setText("中心位置的坐标是：（"+x+","+y+")");
int h=b.getSize().height;
int w=b.getSize().width;
b.setLocation(x-w/2,y-h/2);
}
@Override
public void mouseReleased(MouseEvent arg0)
{
// TODO Auto-generated method stub
}
}
楼主看看对不对
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