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• DateChangeEvent.java

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com.cedarsolutions.client.gwt.custom.datepicker.DateChangeEvent Maven / Gradle / Ivy

/*
 * Copyright 2008 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.cedarsolutions.client.gwt.custom.datepicker;

import java.util.Date;

import com.google.gwt.event.logical.shared.HasValueChangeHandlers;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.shared.HasHandlers;
import com.google.gwt.user.datepicker.client.CalendarUtil;

/**
 * Creates a new value every time a date is accessed (CUSTOMIZED).
 *
 * 

 * Code Source
 * 
 *
 * 

 * This is customized code that that was directly copied from GWT under the terms of its license.
 * 
 *
 * 

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Source:
{@link com.google.gwt.user.datepicker.client.DateChangeEvent}
Version:
GWT 2.4.0
Date:
October, 2011
Purpose:
DateBox doesn't notice when a user clears the field.
See also:
GWT Issue #4084
 * 
 *
 * 

 * The code was copied rather than extended because the original GWT code
 * does not faciliate extension.  GWT code is often difficult to extend due
 * to design choices like the use of private or final variables, methods,
 * or dependent classes.
 * 
 *
 * @author Google
 * @author Kenneth J. Pronovici 
 */
class DateChangeEvent extends ValueChangeEvent {

  /**
   * Fires value change event if the old value is not equal to the new value.
   * Use this call rather than making the decision to short circuit yourself for
   * safe handling of null.
   *
   * @param  The event source
   * @param source the source of the handlers
   * @param oldValue the oldValue, may be null
   * @param newValue the newValue, may be null
   */
  public static  & HasHandlers> void fireIfNotEqualDates(
      S source, Date oldValue, Date newValue) {
    if (ValueChangeEvent.shouldFire(source, oldValue, newValue)) {
      source.fireEvent(new DateChangeEvent(newValue));
    }
  }

  /**
   * Creates a new date value change event.
   *
   * @param value the value
   */
  protected DateChangeEvent(Date value) {
    // The date must be copied in case one handler causes it to change.
    super(CalendarUtil.copyDate(value));
  }

  @Override
  public Date getValue() {
    return CalendarUtil.copyDate(super.getValue());
  }
}