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();   }  }