How to use

setVisible

method

in

com.vaadin.v7.ui.Field

private void setVisible(Field<?> field, boolean visible) {
  field.setEnabled(visible);
  field.setRequired(visible);
  field.setVisible(visible);
}

/**
 * Toggles the visibility of user and password fields. The fields are shown
 * if "authenticate" checkbox is presssed. Otherwise they are not shown.
 */
private void updateAuthenticationFields(boolean visible) throws Property.ReadOnlyException, Converter.ConversionException {
  ((Field<Boolean>) configFieldGroup.getField(MetaConfigModel.AUTHENTICATE)).setValue(visible);
  configFieldGroup.getField(MetaConfigModel.USER).setVisible(visible);
  configFieldGroup.getField(MetaConfigModel.PASSWORD).setVisible(visible);
  if (!visible) {
    configFieldGroup.getField(MetaConfigModel.USER).setValue(null);
    configFieldGroup.getField(MetaConfigModel.PASSWORD).setValue(null);
  }
}