鼠标拖拽移动Java界面组件

  1 package com.jebysun.test.globalhotkey;
  2 
  3 import java.awt.Color;
  4 import java.awt.Cursor;
  5 import java.awt.Point;
  6 import java.awt.event.MouseEvent;
  7 
  8 import javax.swing.JLabel;
  9 import javax.swing.JWindow;
 10 import javax.swing.event.MouseInputListener;
 11 
 12 /**
 13  * 自定义程序窗口，鼠标可拖拽移动其位置。
 14  * @author Jeby Sun
 15  *
 16  */
 17 public class MyFrame extends JWindow {
 18 
 19     private static final long serialVersionUID = 1L;
 20     
 21     JLabel titleLbl;
 22     
 23     public MyFrame() {
 24         //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。
 25         this.getContentPane().setBackground(new Color(0x99FF66));
 26         this.setBounds(100,100,600,400);
 27         this.setLayout(null);
 28         
 29         titleLbl = new JLabel("  自定义窗口标题栏");
 30         titleLbl.setOpaque(true);
 31         titleLbl.setBackground(new Color(0x66CC00));
 32         titleLbl.setBounds(0, 0, 600, 30);
 33         this.add(titleLbl);
 34         //鼠标事件处理类
 35         MouseEventListener mouseListener = new MouseEventListener(this);
 36         titleLbl.addMouseListener(mouseListener);
 37         titleLbl.addMouseMotionListener(mouseListener);
 38         
 39         this.setVisible(true);
 40     }
 41 
 42     /**
 43      * 鼠标事件处理
 44      * @author Jeby Sun
 45      *
 46      */
 47     class MouseEventListener implements MouseInputListener {
 48         
 49         Point origin;
 50         //鼠标拖拽想要移动的目标组件
 51         MyFrame frame;
 52         
 53         public MouseEventListener(MyFrame frame) {
 54             this.frame = frame;
 55             origin = new Point();
 56         }
 57         
 58         @Override
 59         public void mouseClicked(MouseEvent e) {}
 60 
 61         /**
 62          * 记录鼠标按下时的点
 63          */
 64         @Override
 65         public void mousePressed(MouseEvent e) {
 66              origin.x = e.getX();  
 67              origin.y = e.getY();
 68         }
 69 
 70         @Override
 71         public void mouseReleased(MouseEvent e) {}
 72 
 73         /**
 74          * 鼠标移进标题栏时，设置鼠标图标为移动图标
 75          */
 76         @Override
 77         public void mouseEntered(MouseEvent e) {
 78             this.frame.setCursor(Cursor.getPredefinedCursor(Cursor.MOVE_CURSOR));
 79         }
 80         
 81         /**
 82          * 鼠标移出标题栏时，设置鼠标图标为默认指针
 83          */
 84         @Override
 85         public void mouseExited(MouseEvent e) {
 86             this.frame.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
 87         }
 88 
 89         /**
 90          * 鼠标在标题栏拖拽时，设置窗口的坐标位置
 91          * 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）
 92          */
 93         @Override
 94         public void mouseDragged(MouseEvent e) {
 95             Point p = this.frame.getLocation();
 96             this.frame.setLocation(
 97                 p.x + (e.getX() - origin.x), 
 98                 p.y + (e.getY() - origin.y));  
 99         }
100 
101         @Override
102         public void mouseMoved(MouseEvent e) {}
103         
104     }
105     
106     
107     public static void main(String[] args) {
108         new MyFrame();
109     }
110 
111 }