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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.net.URL;
import java.util.Optional;
import javax.accessibility.Accessible;
import javax.swing.*;
import javax.swing.plaf.basic.ComboPopup;
public final class MainPanel extends JPanel {
private MainPanel() {
super(new BorderLayout());
String path1 = "example/favicon.png";
String path2 = "example/animated.gif";
JComboBox<Icon> combo = new JComboBox<>();
Icon[] icons = {makeIcon(path1), makeAnimatedIcon(path2, combo, 1)};
combo.setModel(new DefaultComboBoxModel<>(icons));
JPanel p = new JPanel(new GridLayout(4, 1, 5, 5));
setBorder(BorderFactory.createEmptyBorder(5, 20, 5, 20));
p.add(new JLabel("Default ImageIcon"));
p.add(new JComboBox<>(new Icon[] {makeIcon(path1), makeIcon(path2)}));
p.add(new JLabel("ImageIcon#setImageObserver(ImageObserver)"));
p.add(combo);
add(p, BorderLayout.NORTH);
setPreferredSize(new Dimension(320, 240));
}
public static Icon makeAnimatedIcon(String path, JComboBox<?> combo, int row) {
URL url = Thread.currentThread().getContextClassLoader().getResource(path);
return Optional.ofNullable(url)
.<Icon>map(u -> {
ImageIcon icon = new ImageIcon(u);
// Wastefulness: icon.setImageObserver(combo);
icon.setImageObserver((img, infoflags, x, y, w, h) -> {
// @see http://www2.gol.com/users/tame/swing/examples/SwingExamples.html
if (combo.isShowing() && (infoflags & (FRAMEBITS | ALLBITS)) != 0) {
repaintComboBox(combo, row);
}
return (infoflags & (ALLBITS | ABORT)) == 0;
});
return icon;
})
.orElseGet(() -> UIManager.getIcon("html.missingImage"));
}
private static Icon makeIcon(String path) {
URL url = Thread.currentThread().getContextClassLoader().getResource(path);
return Optional.ofNullable(url)
.<Icon>map(ImageIcon::new)
.orElseGet(() -> UIManager.getIcon("html.missingImage"));
}
public static void repaintComboBox(JComboBox<?> combo, int row) {
if (combo.getSelectedIndex() == row) {
combo.repaint();
}
Accessible a = combo.getAccessibleContext().getAccessibleChild(0);
if (a instanceof ComboPopup) {
JList<?> list = ((ComboPopup) a).getList();
if (list.isShowing()) {
list.repaint(list.getCellBounds(row, row));
}
}
}
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);
}
}