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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.ActionListener;
import java.util.stream.Stream;
import javax.swing.*;
public final class MainPanel extends JPanel {
private MainPanel() {
super(new GridLayout(2, 1));
add(makeCmp1());
add(makeCmp2());
setPreferredSize(new Dimension(320, 240));
}
private static Component makeCmp1() {
JPanel p = new JPanel(new GridBagLayout());
p.setBorder(BorderFactory.createTitledBorder("Override JToggleButton#getPreferredSize(...)"));
GridBagConstraints c = new GridBagConstraints();
c.insets = new Insets(5, 5, 5, 5);
ActionListener al = e -> p.revalidate();
ButtonGroup bg = new ButtonGroup();
Stream.of("a1", "a2", "a3").forEach(s -> {
JToggleButton b = new JToggleButton(s) {
@Override public Dimension getPreferredSize() {
int v = isSelected() ? 80 : 50;
return new Dimension(v, v);
}
};
b.addActionListener(al);
bg.add(b);
p.add(b, c);
});
return p;
}
private static Component makeCmp2() {
JPanel p = new JPanel(new GridBagLayout());
p.setBorder(BorderFactory.createTitledBorder("Override FlowLayout#layoutContainer(...)"));
p.setLayout(new FlowLayout() {
@Override public void layoutContainer(Container target) {
synchronized (target.getTreeLock()) {
int nmembers = target.getComponentCount();
if (nmembers <= 0) {
return;
}
Insets insets = target.getInsets();
// int vgap = getVgap();
int hgap = getHgap();
int rowHeight = target.getHeight();
int x = insets.left + hgap;
Dimension d = new Dimension();
for (Component m : target.getComponents()) {
if (m.isVisible() && m instanceof AbstractButton) {
int v = ((AbstractButton) m).isSelected() ? 80 : 50;
d.setSize(v, v);
m.setSize(d);
int y = (rowHeight - v) / 2;
m.setLocation(x, y);
x += d.width + hgap;
}
}
}
}
});
ActionListener al = e -> p.revalidate();
ButtonGroup bg = new ButtonGroup();
Stream.of("b1", "b2", "b3").forEach(s -> {
JToggleButton b = new JToggleButton(s);
b.addActionListener(al);
bg.add(b);
p.add(b);
});
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);
}
}