Swing/KeyboardLayout のバックアップ(No.1)

private static final String[][] KEYS = {
  {"`", "1", "2", "3", "4", "5", "6", "7", "8", "9", "0", "-", "=", "BS"},
  {"Tab", "Q", "W", "E", "R", "T", "Y", "U", "I", "O", "P", "[", "]", "\\", ""},
  {"Ctrl", "A", "S", "D", "F", "G", "H", "J", "K", "L", ";", "'", "Enter", ""},
  {"Shift", "Z", "X", "C", "V", "B", "N", "M", ",", ".", "/", "", "↑"},
  {"Fn", "Alt", "                             ", "Alt", "←", "↓", "→"}
};

private static Component makeKeyboardPanel() {
  JPanel keyboard = new JPanel(new GridBagLayout());

  GridBagConstraints c = new GridBagConstraints();
  c.weightx = 1d;
  c.weighty = 1d;
  c.fill = GridBagConstraints.BOTH;
  c.gridheight = 1;
  c.gridx = 0;

  c.gridy = 50;
  for (int i = 0; i < KEYS[0].length * 2; i++) {
    c.gridx = i;
    keyboard.add(Box.createHorizontalStrut(KeyButton.SIZE));
  }

  for (int row = 0; row < KEYS.length; row++) {
    c.gridx = 0;
    c.gridy = row;
    for (int col = 0; col < KEYS[row].length; col++) {
      String key = KEYS[row][col];
      int len = key.length();
      c.gridwidth = len > 10 ? 14 :
                    len > 4  ?  4 :
                    len > 1  ?  3 :
                    len == 1 ?  2 : 1;
      if (key.isEmpty()) {
        keyboard.add(Box.createHorizontalStrut(KeyButton.SIZE), c);
      } else {
        keyboard.add(new KeyButton(key, len <= 2), c);
      }
      c.gridx += c.gridwidth;
    }
  }
  EventQueue.invokeLater(() -> SwingUtilities.updateComponentTreeUI(keyboard));
  return keyboard;
}