JTextPaneを一行に制限してスタイル可能なJTextFieldとして使用する

JTextPane textPane = new JTextPane() {
  @Override public void scrollRectToVisible(Rectangle rect) {
    rect.grow(getInsets().right, 0);
    super.scrollRectToVisible(rect);
  }
};
textPane.setEditorKit(new NoWrapEditorKit());
AbstractDocument doc = new SimpleSyntaxDocument();
textPane.setDocument(doc);
try {
  doc.insertString(0, text, null);
} catch (Exception ex) {
  ex.printStackTrace();
}
String KEY = "Do-Nothing";
InputMap im = textPane.getInputMap(JComponent.WHEN_FOCUSED);
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0), KEY);
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_TAB, 0), KEY);
textPane.getActionMap().put(KEY, new AbstractAction() {
  @Override public void actionPerformed(ActionEvent e) {
    // Do nothing
  }
});

// @see https://ateraimemo.com/Swing/FocusTraversalKeys.html
Set<AWTKeyStroke> forwardKeys = new HashSet<AWTKeyStroke>(
    textPane.getFocusTraversalKeys(KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS));
forwardKeys.add(KeyStroke.getKeyStroke(KeyEvent.VK_TAB, 0));
forwardKeys.add(KeyStroke.getKeyStroke(KeyEvent.VK_TAB, InputEvent.SHIFT_DOWN_MASK));
textPane.setFocusTraversalKeys(KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, forwardKeys);

JScrollPane scrollPane = new JScrollPane(
    textPane, ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER,
              ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER) {
  @Override public Dimension getMinimumSize() {
    return super.getPreferredSize();
  }
};