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    Wed Apr 11 17:59:43     2007, Created by tomyeh

Copyright (C) 2007 Potix Corporation. All Rights Reserved.

  This program is distributed under LGPL Version 3.0 in the hope that
  it will be useful, but WITHOUT ANY WARRANTY.
package org.zkoss.zul;

import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.WrongValueException;

 * Additional interface implemented with {@link Constraint} to denote
 * a constraint supports a custom way to display the error message.
 * If this interface is implemented, the default error box won't be
 * displayed. Rather, {@link #showCustomError} is called.
 * <p>Since 5.0.0, {@link ClientConstraint} has the higher priority than
 * {@link CustomConstraint}. In other words, {@link CustomConstraint}
 * is ignored if both defined.
 * On the other hand, the client validation object ({@link ClientConstraint#getClientConstraint})
 * can implement the showCustomError method to do the similar job
 * at the client.
 * @author tomyeh
 * @see Constraint
 * @see ClientConstraint
public interface CustomConstraint {
  /** To display the error message in a custom way.
   * Note: this method is called either with a error or not, depending
   * on whether ex is null.
   * @param comp the component causing the error.
   * @param ex the error to display, or null to clear
   * the error message.
  public void showCustomError(Component comp, WrongValueException ex);
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