/** Updates the information displayed in the fields. */
  public void update() {
    super.update(); // update the common fields

    InteractiveEntity interactiveEntity = (InteractiveEntity) entity;
    String sprite = interactiveEntity.getProperty("sprite");
    String behavior = interactiveEntity.getProperty("behavior");
    EntitySubtype subtype = interactiveEntity.getSubtype();

    boolean hasSprite = (!sprite.equals("_none"));

    withSpriteField.setSelected(hasSprite);
    spriteField.setSelectedId(hasSprite ? sprite : "");

    spriteField.setEnabled(hasSprite);

    if (behavior.equals("map")) {
      behaviorField.setSelectedIndex(1);
      messageField.setEnabled(false);
      itemField.setEnabled(false);
    } else if (behavior.substring(0, 5).equals("item#")) {
      behaviorField.setSelectedIndex(2);
      messageField.setEnabled(false);
      itemField.setEnabled(true);
      itemField.setSelectedId(behavior.substring(5));
    } else if (behavior.substring(0, 7).equals("dialog#")) {
      behaviorField.setSelectedIndex(0);
      messageField.setEnabled(true);
      itemField.setEnabled(false);
      messageField.setText(behavior.substring(7));
    }
  }
  /**
   * Constructor.
   *
   * @param tileset A tileset.
   * @param oldPatternId The tile pattern id to change in this tileset.
   */
  public TilePatternIdRefactoringComponent(Tileset tileset, String oldPatternId) {
    super();

    setLayout(new BoxLayout(this, BoxLayout.PAGE_AXIS));
    setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));

    JPanel patternIdPanel = new JPanel();
    patternIdPanel.setLayout(new BoxLayout(patternIdPanel, BoxLayout.LINE_AXIS));
    patternIdPanel.setAlignmentX(1.0f);
    JLabel patternIdLabel = new JLabel("Tile pattern id:");
    patternIdPanel.add(patternIdLabel);
    patternIdPanel.add(Box.createHorizontalStrut(10));
    patternIdField = new JTextField(oldPatternId, 20);
    patternIdField.selectAll();
    patternIdPanel.add(patternIdField);
    patternIdPanel.setAlignmentX(0.0f);
    add(patternIdPanel);
    add(Box.createVerticalStrut(10));
    updateMapsCheckBox = new JCheckBox("Update references in existing maps");
    updateMapsCheckBox.setSelected(true);
    updateMapsCheckBox.setAlignmentX(0.0f);
    add(updateMapsCheckBox);
  }