| /* |
| * 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.event.logical.shared; |
| |
| import com.google.gwt.event.shared.GwtEvent; |
| import com.google.gwt.event.shared.HasHandlers; |
| |
| /** |
| * Represents a show range event. This logical event should be used when a |
| * widget displays a range of values to the user. |
| * |
| * @param <V> the type of range |
| */ |
| public class ShowRangeEvent<V> extends GwtEvent<ShowRangeHandler<V>> { |
| |
| /** |
| * Handler type. |
| */ |
| private static Type<ShowRangeHandler<?>> TYPE; |
| |
| /** |
| * Fires a show range event on all registered handlers in the handler manager. |
| * |
| * @param <V> the type of range |
| * @param <S> the event source |
| * @param source the source of the handlers |
| * @param start the start of the range |
| * @param end the end of the range |
| */ |
| public static <V, S extends HasShowRangeHandlers<V> & HasHandlers> void fire( |
| S source, V start, V end) { |
| if (TYPE != null) { |
| ShowRangeEvent<V> event = new ShowRangeEvent<V>(start, end); |
| source.fireEvent(event); |
| } |
| } |
| |
| /** |
| * Gets the type associated with this event. |
| * |
| * @return returns the handler type |
| */ |
| public static Type<ShowRangeHandler<?>> getType() { |
| if (TYPE == null) { |
| TYPE = new Type<ShowRangeHandler<?>>(); |
| } |
| return TYPE; |
| } |
| |
| private final V start; |
| |
| private final V end; |
| |
| /** |
| * Creates a new show range event. |
| * |
| * @param start start of the range |
| * @param end end of the range |
| */ |
| protected ShowRangeEvent(V start, V end) { |
| this.start = start; |
| this.end = end; |
| } |
| |
| // Because of type erasure, our static type is |
| // wild carded, yet the "real" type should use our I param. |
| @SuppressWarnings("unchecked") |
| @Override |
| public final Type<ShowRangeHandler<V>> getAssociatedType() { |
| return (Type) TYPE; |
| } |
| |
| /** |
| * Gets the end of the range. |
| * |
| * @return end of the range |
| */ |
| public V getEnd() { |
| return end; |
| } |
| |
| /** |
| * Gets the start of the range. |
| * |
| * @return start of the range |
| */ |
| public V getStart() { |
| return start; |
| } |
| |
| @Override |
| protected void dispatch(ShowRangeHandler<V> handler) { |
| handler.onShowRange(this); |
| } |
| } |