com.google.gwt.user.datepicker.client.DateChangeEvent Maven / Gradle / Ivy
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/*
* 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.google.gwt.user.datepicker.client;
import com.google.gwt.event.logical.shared.HasValueChangeHandlers;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.shared.HasHandlers;
import java.util.Date;
/**
* Creates a new value every time a date is accessed.
*/
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());
}
}