/
MainPanel.java
76 lines (68 loc) · 2.42 KB
/
MainPanel.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
// -*- mode:java; encoding:utf-8 -*-
// vim:set fileencoding=utf-8:
// @homepage@
package example;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.InputStream;
import java.util.Optional;
import javax.imageio.ImageIO;
import javax.swing.*;
public final class MainPanel extends JPanel {
private MainPanel() {
super(new BorderLayout());
String path = "example/16x16.png";
ClassLoader cl = Thread.currentThread().getContextClassLoader();
Image image = Optional.ofNullable(cl.getResource(path)).map(url -> {
try (InputStream s = url.openStream()) {
return ImageIO.read(s);
} catch (IOException ex) {
return makeMissingImage();
}
}).orElseGet(MainPanel::makeMissingImage);
JCheckBox check = new JCheckBox("setIconImage");
check.addActionListener(e -> {
JCheckBox c = (JCheckBox) e.getSource();
Container w = c.getTopLevelAncestor();
if (w instanceof Window) {
((Window) w).setIconImage(c.isSelected() ? image : null);
}
});
JPanel p = new JPanel();
p.setBorder(BorderFactory.createTitledBorder("Window#setIconImage(Image)"));
p.add(check);
add(p, BorderLayout.NORTH);
setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
setPreferredSize(new Dimension(320, 240));
}
private static Image makeMissingImage() {
Icon missingIcon = UIManager.getIcon("html.missingImage");
int iw = missingIcon.getIconWidth();
int ih = missingIcon.getIconHeight();
BufferedImage bi = new BufferedImage(16, 16, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = bi.createGraphics();
missingIcon.paintIcon(null, g2, (16 - iw) / 2, (16 - ih) / 2);
g2.dispose();
return bi;
}
public static void main(String[] args) {
EventQueue.invokeLater(MainPanel::createAndShowGui);
}
private static void createAndShowGui() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (UnsupportedLookAndFeelException ignored) {
Toolkit.getDefaultToolkit().beep();
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException ex) {
ex.printStackTrace();
return;
}
JFrame frame = new JFrame("@title@");
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.getContentPane().add(new MainPanel());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}