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MainPanel.java
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/
MainPanel.java
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// -*- mode:java; encoding:utf-8 -*-
// vim:set fileencoding=utf-8:
// @homepage@
package example;
import java.awt.*;
import java.awt.event.ItemEvent;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.Optional;
import java.util.stream.Stream;
import javax.imageio.ImageIO;
import javax.swing.*;
public final class MainPanel extends JPanel {
private MainPanel() {
super(new BorderLayout());
JRadioButton r1 = new JRadioButton("img=null");
r1.addItemListener(e -> {
if (e.getStateChange() == ItemEvent.SELECTED) {
setIconImage(null);
}
});
JRadioButton r2 = new JRadioButton("img=new ImageIcon(\"\").getImage()");
r2.addItemListener(e -> {
if (e.getStateChange() == ItemEvent.SELECTED) {
setIconImage(new ImageIcon("").getImage()); // JDK 1.5
}
});
JRadioButton r3 = new JRadioButton("img=new BufferedImage(1, 1, TYPE_INT_ARGB)");
r3.addItemListener(e -> {
if (e.getStateChange() == ItemEvent.SELECTED) {
setIconImage(new BufferedImage(1, 1, BufferedImage.TYPE_INT_ARGB)); // size=(1x1)
}
});
ClassLoader cl = Thread.currentThread().getContextClassLoader();
URL url = cl.getResource("example/16x16transparent.png");
Image image = Optional.ofNullable(url).map(u -> {
try (InputStream s = u.openStream()) {
return ImageIO.read(s);
} catch (IOException ex) {
return makeMissingImage();
}
}).orElseGet(MainPanel::makeMissingImage);
JRadioButton r4 = new JRadioButton("img=toolkit.createImage(url_16x16transparent)", true);
r4.addItemListener(e -> {
if (e.getStateChange() == ItemEvent.SELECTED) {
// setIconImage(Toolkit.getDefaultToolkit().createImage(url)); // 16x16transparent.png
setIconImage(image);
}
});
if (url != null) {
EventQueue.invokeLater(() -> setIconImage(Toolkit.getDefaultToolkit().createImage(url)));
}
Box box = Box.createVerticalBox();
box.setBorder(BorderFactory.createTitledBorder("frame.setIconImage(img)"));
ButtonGroup bg = new ButtonGroup();
Stream.of(r1, r2, r3, r4).forEach(b -> {
bg.add(b);
box.add(b);
box.add(Box.createVerticalStrut(5));
});
add(box);
setPreferredSize(new Dimension(320, 240));
}
private static Image makeMissingImage() {
return new BufferedImage(16, 16, BufferedImage.TYPE_INT_ARGB);
}
public void setIconImage(Image image) {
Container c = getTopLevelAncestor();
if (c instanceof Frame) {
((Frame) c).setIconImage(image);
}
}
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);
}
}