com.google.gwt.event.logical.shared.ShowRangeEvent 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.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 the type of range
*/
public class ShowRangeEvent extends GwtEvent> {
/**
* Handler type.
*/
private static Type> TYPE;
/**
* Fires a show range event on all registered handlers in the handler manager.
*
* @param the type of range
* @param 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 & HasHandlers> void fire(
S source, V start, V end) {
if (TYPE != null) {
ShowRangeEvent event = new ShowRangeEvent(start, end);
source.fireEvent(event);
}
}
/**
* Gets the type associated with this event.
*
* @return returns the handler type
*/
public static Type> getType() {
if (TYPE == null) {
TYPE = new Type>();
}
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> 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 handler) {
handler.onShowRange(this);
}
}