| /* |
| * 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.view.client; |
| |
| import com.google.gwt.event.shared.EventHandler; |
| import com.google.gwt.event.shared.GwtEvent; |
| |
| /** |
| * Represents a range change event. |
| */ |
| public class RangeChangeEvent extends GwtEvent<RangeChangeEvent.Handler> { |
| |
| /** |
| * Handler type. |
| */ |
| private static Type<Handler> TYPE; |
| |
| /** |
| * Handler interface for {@link RangeChangeEvent} events. |
| */ |
| public static interface Handler extends EventHandler { |
| |
| /** |
| * Called when a {@link RangeChangeEvent} is fired. |
| * |
| * @param event the {@link RangeChangeEvent} that was fired |
| */ |
| void onRangeChange(RangeChangeEvent event); |
| } |
| |
| /** |
| * Fires a {@link RangeChangeEvent} on all registered handlers in the handler |
| * manager. If no such handlers exist, this method will do nothing. |
| * |
| * @param source the source of the handlers |
| * @param range the new range |
| */ |
| public static void fire(HasRows source, Range range) { |
| if (TYPE != null) { |
| RangeChangeEvent event = new RangeChangeEvent(range); |
| source.fireEvent(event); |
| } |
| } |
| |
| /** |
| * Gets the type associated with this event. |
| * |
| * @return returns the handler type |
| */ |
| public static Type<Handler> getType() { |
| if (TYPE == null) { |
| TYPE = new Type<Handler>(); |
| } |
| return TYPE; |
| } |
| |
| private final Range range; |
| |
| /** |
| * Creates a {@link RangeChangeEvent}. |
| * |
| * @param range the new range |
| */ |
| protected RangeChangeEvent(Range range) { |
| this.range = range; |
| } |
| |
| @Override |
| public final Type<Handler> getAssociatedType() { |
| return TYPE; |
| } |
| |
| /** |
| * Gets the new range. |
| * |
| * @return the new range |
| */ |
| public Range getNewRange() { |
| return range; |
| } |
| |
| @Override |
| public String toDebugString() { |
| return super.toDebugString() + getNewRange(); |
| } |
| |
| @Override |
| protected void dispatch(Handler handler) { |
| handler.onRangeChange(this); |
| } |
| } |