Java实现鼠标拖拽移动界面组件

　　默认的，frame或者Jframe自身已经实现了鼠标拖拽标题栏移动窗口的功能。

　　只是，当你不满意java的Jframe样式，隐藏了标题栏和边框，又或者干脆直接使用JWindow，那你又该怎么实现鼠标拖拽移动窗口的目的呢？最开始，我简单的在mouseDragged方法里frame.setLocation(e.getX(), e.getY())，结果，frame拖拽的时候不停地闪烁，位置在屏幕上不断跳动。后来网上查资料，找到了答案。

 这里给一个简单的示例，一看就明白：

 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;
 
 
 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);
   }
 
   
   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) {}
 
     
     @Override
     public void mousePressed(MouseEvent e) {
origin.x = e.getX(); 
origin.y = e.getY();
     }
 
     @Override
     public void mouseReleased(MouseEvent e) {}
 
     
     @Override
     public void mouseEntered(MouseEvent e) {
this.frame.setCursor(Cursor.getPredefinedCursor(Cursor.MOVE_CURSOR));
     }
     
     
     @Override
     public void mouseExited(MouseEvent e) {
this.frame.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
     }
 
     
     @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();
   }
 
 }