Java实现鼠标拖拽移动界面组件

 package com.jebysun.test.globalhotkey;
 
 import java.awt.Color;
 import java.awt.Cursor;
 import java.awt.Point;
 import java.awt.event.MouseEvent;
 
 import javax.swing.JLabel;
 import javax.swing.JWindow;
 import javax.swing.event.MouseInputListener;
 
 /**
 * 自定义程序窗口，鼠标可拖拽移动其位置。
 * @author Jeby Sun
 *
 */
 public class MyFrame extends JWindow {
 
   private static final long serialVersionUID = 1L;
   
   JLabel titleLbl;
   
   public MyFrame() {
     //设置背景颜色不能直接调用其setBackground方法，而要设置其ContentPane的背景颜色。
     this.getContentPane().setBackground(new Color(0x99FF66));
     this.setBounds(100,100,600,400);
     this.setLayout(null);
     
     titleLbl = new JLabel(" 自定义窗口标题栏");
     titleLbl.setOpaque(true);
     titleLbl.setBackground(new Color(0x66CC00));
     titleLbl.setBounds(0, 0, 600, 30);
     this.add(titleLbl);
     //鼠标事件处理类
     MouseEventListener mouseListener = new MouseEventListener(this);
     titleLbl.addMouseListener(mouseListener);
     titleLbl.addMouseMotionListener(mouseListener);
     
     this.setVisible(true);
   }
 
   /**
   * 鼠标事件处理
   * @author Jeby Sun
   *
   */
   class MouseEventListener implements MouseInputListener {
     
     Point origin;
     //鼠标拖拽想要移动的目标组件
     MyFrame frame;
     
     public MouseEventListener(MyFrame frame) {
       this.frame = frame;
       origin = new Point();
     }
     
     @Override
     public void mouseClicked(MouseEvent e) {}
 
     /**
     * 记录鼠标按下时的点
     */
     @Override
     public void mousePressed(MouseEvent e) {
       origin.x = e.getX(); 
       origin.y = e.getY();
     }
 
     @Override
     public void mouseReleased(MouseEvent e) {}
 
     /**
     * 鼠标移进标题栏时，设置鼠标图标为移动图标
     */
     @Override
     public void mouseEntered(MouseEvent e) {
       this.frame.setCursor(Cursor.getPredefinedCursor(Cursor.MOVE_CURSOR));
     }
     
     /**
     * 鼠标移出标题栏时，设置鼠标图标为默认指针
     */
     @Override
     public void mouseExited(MouseEvent e) {
       this.frame.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
     }
 
     /**
     * 鼠标在标题栏拖拽时，设置窗口的坐标位置
     * 窗口新的坐标位置 = 移动前坐标位置+（鼠标指针当前坐标-鼠标按下时指针的位置）
     */
     @Override
     public void mouseDragged(MouseEvent e) {
       Point p = this.frame.getLocation();
       this.frame.setLocation(
         p.x + (e.getX() - origin.x), 
         p.y + (e.getY() - origin.y)); 
     }
 
     @Override
     public void mouseMoved(MouseEvent e) {}
     
   }
   
   public static void main(String[] args) {
     new MyFrame();
   }
 
 }