package demo;

import java.awt.Button;
import java.awt.Component;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.TextField;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.SwingUtilities;

public class WinB extends Frame implements MouseListener, MouseMotionListener {
    Button button;
    TextField text;
    int x, y;
    boolean move = false;

    WinB() {
    button = new Button("用鼠标拖动我");
    text = new TextField("用鼠标拖动我", 8);
    button.addMouseListener(this);
    button.addMouseMotionListener(this);
    text.addMouseListener(this);
    text.addMouseMotionListener(this);
    addMouseMotionListener(this);
    setLayout(new FlowLayout());
    add(button);
    add(text);
    addWindowListener(new WindowAdapter() {
        public void windowClosing(WindowEvent e) {
        System.exit(0);
        }
    });
    setBounds(10, 10, 350, 300);
    setVisible(true);
    validate();
    }

    public void mousePressed(MouseEvent e) {
    }

    public void mouseReleased(MouseEvent e) {
    move = false;

    }

    public void mouseEntered(MouseEvent e) {
    }

    public void mouseExited(MouseEvent e) {
    }

    public void mouseClicked(MouseEvent e) {
    }

    public void mouseMoved(MouseEvent e) {
    }

    public void mouseDragged(MouseEvent e) {
    Component com = e.getComponent();
    if (com instanceof Component) {
        if (com != this)
        move = true;
        e = SwingUtilities.convertMouseEvent(com, e, this);
        if (move) {
        x = e.getX();
        y = e.getY();
        int w = com.getSize().width;
        int h = com.getSize().height;
        com.setLocation(x - w / 2, y - h / 2);
        }
    }
    }
}