Swing/InputVerifierFocusOrder のバックアップ(No.9)

JTextField textField = new JTextField(24);
textField.setInputVerifier(new InputVerifier() {
  @Override public boolean verify(JComponent c) {
    if (c instanceof JTextComponent) {
      JTextComponent tc = (JTextComponent) c;
      String str = tc.getText().trim();
      return !str.isEmpty() && MAX_LEN - str.length() >= 0;
    }
    return false;
  }
  @Override public boolean shouldYieldFocus(JComponent input) {
    System.out.println("shouldYieldFocus");
    if (isAllValid()) {
      button.setEnabled(true);
      // EventQueue.invokeLater(() -> button.requestFocusInWindow());
    } else {
      button.setEnabled(false);
    }
    return super.shouldYieldFocus(input);
  }
});
setFocusTraversalPolicy(new LayoutFocusTraversalPolicy() {
  @Override public Component getComponentAfter(
      Container focusCycleRoot, Component aComponent) {
    System.out.println("getComponentAfter");
    button.setEnabled(isAllValid());
    return super.getComponentAfter(focusCycleRoot, aComponent);
  }
  @Override public Component getComponentBefore(
      Container focusCycleRoot, Component aComponent) {
    System.out.println("getComponentAfter");
    button.setEnabled(isAllValid());
    return super.getComponentBefore(focusCycleRoot, aComponent);
  }
});
setFocusCycleRoot(true);