/
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.util.Objects;
import java.util.Optional;
import javax.swing.*;
// import javax.swing.plaf.basic.BasicComboBoxUI;
public final class MainPanel extends JPanel {
private MainPanel() {
super(new BorderLayout());
Box p = Box.createVerticalBox();
String[] items = {"JComboBox 11111:", "JComboBox 222:", "JComboBox 33:"};
JComboBox<String> combo1 = new JComboBox<String>(items) {
@Override public void updateUI() {
super.updateUI();
ListCellRenderer<? super String> r = getRenderer();
if (r instanceof Component) {
((Component) r).setPreferredSize(new Dimension(0, 32));
}
}
};
p.add(makeTitledPanel("setPreferredSize", combo1));
p.add(Box.createVerticalStrut(5));
JComboBox<String> combo2 = new JComboBox<>(items);
combo2.setRenderer(new DefaultListCellRenderer() {
private int cellHeight;
@Override public Component getListCellRendererComponent(JList<?> list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
// Dimension d = super.getPreferredSize();
// cellHeight = index < 0 ? d.height : 32;
cellHeight = Optional.ofNullable(super.getPreferredSize())
.filter(d -> index < 0).map(d -> d.height).orElse(32);
return super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
}
@Override public Dimension getPreferredSize() {
Dimension d = super.getPreferredSize();
d.height = cellHeight;
return d;
}
});
p.add(makeTitledPanel("getListCellRendererComponent", combo2));
p.add(Box.createVerticalStrut(5));
JComboBox<String> combo3 = new JComboBox<String>(items) {
@Override public void updateUI() {
setRenderer(null);
super.updateUI();
ListCellRenderer<? super String> r = getRenderer();
setRenderer((list, value, index, isSelected, cellHasFocus) -> {
String title = Objects.toString(value, "");
if (index >= 0) {
title = String.format("<html><table><td height='32'>%s", value);
}
return r.getListCellRendererComponent(list, title, index, isSelected, cellHasFocus);
});
}
};
p.add(makeTitledPanel("html", combo3));
p.add(Box.createVerticalStrut(5));
JComboBox<String> combo4 = new JComboBox<String>(items) {
@Override public void updateUI() {
setRenderer(null);
super.updateUI();
ListCellRenderer<? super String> r = getRenderer();
setRenderer((list, value, index, isSelected, cellHasFocus) -> {
Component c = r.getListCellRendererComponent(
list, value, index, isSelected, cellHasFocus);
if (c instanceof JLabel) {
((JLabel) c).setIcon(index >= 0 ? new H32Icon() : null);
}
return c;
});
}
};
p.add(makeTitledPanel("icon", combo4));
p.add(Box.createVerticalStrut(5));
// JComboBox<String> combo5 = new JComboBox<>(items);
// combo5.setUI(new BasicComboBoxUI() {
// @Override protected ComboPopup createPopup() {
// return new BasicComboPopup(combo) {
// @Override protected void configureList() {
// super.configureList();
// list.setFixedCellHeight(60);
// }
// };
// }
// });
// p.add(makeTitledPanel("BasicComboBoxUI", combo5));
add(p, BorderLayout.NORTH);
setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
setPreferredSize(new Dimension(320, 240));
}
private static Component makeTitledPanel(String title, Component c) {
JPanel p = new JPanel(new BorderLayout());
p.setBorder(BorderFactory.createTitledBorder(title));
p.add(c);
return p;
}
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);
}
}
class H32Icon implements Icon {
@Override public void paintIcon(Component c, Graphics g, int x, int y) {
/* Empty icon */
}
@Override public int getIconWidth() {
return 0;
}
@Override public int getIconHeight() {
return 32;
}
}