| /* |
| * 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<Date> { |
| |
| /** |
| * 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 <I> the old value type |
| * @param <S> 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 <S extends HasValueChangeHandlers<Date> & 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()); |
| } |
| } |