Swing 设置无边框Frame

 1 import java.awt.*;
 2 import java.awt.event.*;
 3 import javax.swing.*;
 4 
 5 public class LogANA extends JFrame {
 6 
 7     //背景图片bgImage
 8     private ImageIcon bgImage = new ImageIcon("src/main/images/bg.jpg");
 9     //用于处理拖动事件，表示鼠标按下时的坐标，相对于JFrame
10     int xOld = 0;
11     int yOld = 0;
12 
13     private ImageIcon bt1mage = new ImageIcon("src/main/images/mini.png");
14     private ImageIcon bt1mage_enable = new ImageIcon("src/main/images/mini_enable.png");
15     private ImageIcon bt2mage = new ImageIcon("src/main/images/close.png");
16     private ImageIcon bt2mage_enable = new ImageIcon("src/main/images/close_enable.png");
17 
18 
19 
20     public LogANA() {
21 
22         getContentPane().setLayout(new BorderLayout());
23         this.setLocationRelativeTo(null);
24         this.setSize(bgImage.getIconWidth(), bgImage.getIconHeight());
25 
26         //处理拖动事件---去掉默认边框后，不能拖动了，具体实现如下
27         this.addMouseListener(new MouseAdapter() {
28             @Override
29             public void mousePressed(MouseEvent e) {
30                 xOld = e.getX();//记录鼠标按下时的坐标
31                 yOld = e.getY();
32             }
33         });
34 
35         this.addMouseMotionListener(new MouseMotionAdapter() {
36             @Override
37             public void mouseDragged(MouseEvent e) {
38                 int xOnScreen = e.getXOnScreen();
39                 int yOnScreen = e.getYOnScreen();
40                 int xx = xOnScreen - xOld;
41                 int yy = yOnScreen - yOld;
42                 LogANA.this.setLocation(xx, yy);//设置拖拽后，窗口的位置
43             }
44         });
45 
46 
47         JPanel mainPanel = new JPanel();
48         mainPanel.setBorder(BorderFactory.createLineBorder(Color.BLACK));
49         mainPanel.setSize(bgImage.getIconWidth(), 100);
50         mainPanel.setLayout(new FlowLayout(FlowLayout.RIGHT, 10, 10));
51 
52         //关闭按钮
53         JButton miniBtn = new MyIconButton(bt1mage, bt1mage_enable, bt1mage, "");
54         mainPanel.add(miniBtn);
55 
56         //关闭按钮
57         JButton closeBtn = new MyIconButton(bt2mage, bt2mage_enable, bt2mage, "");
58         mainPanel.add(closeBtn);
59 
60 
61         getContentPane().add(mainPanel, BorderLayout.CENTER);
62 
63         closeBtn.addActionListener(new ActionListener() {
64             @Override
65             public void actionPerformed(ActionEvent e) {
66                 System.exit(0);
67             }
68         });
69 
70         miniBtn.addActionListener(new ActionListener() {
71             @Override
72             public void actionPerformed(ActionEvent e) {
73                 setExtendedState(JFrame.ICONIFIED);//最小化窗体
74             }
75         });
76 
77         setUndecorated(true);
78         setLocationRelativeTo(null);
79         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
80     }
81 
82     public static void main(String[] args) {
83         LogANA j = new LogANA();
84         j.setVisible(true);
85     }
86 
87 }