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/*
* Copyright 2000-2016 Vaadin Ltd.
*
* 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.vaadin.event;
import java.lang.reflect.Method;
import com.vaadin.ui.Component;
import com.vaadin.util.ReflectTools;
/**
* An event that is fired when an item is expanded in a listing component that
* displays hierarchical data.
*
* @author Vaadin Ltd
* @since 8.1
* @param <T>
* the expanded item's type
*/
public class ExpandEvent<T> extends Component.Event
implements HasUserOriginated {
private final T expandedItem;
private final boolean userOriginated;
/**
* Construct an expand event.
*
* @param source
* the hierarchical component this event originated from
* @param expandedItem
* the item that was expanded
* @param userOriginated
* whether the expand was triggered by a user interaction or the
* server
*/
public ExpandEvent(Component source, T expandedItem,
boolean userOriginated) {
super(source);
this.expandedItem = expandedItem;
this.userOriginated = userOriginated;
}
/**
* Get the expanded item that triggered this event.
*
* @return the expanded item
*/
public T getExpandedItem() {
return expandedItem;
}
@Override
public boolean isUserOriginated() {
return userOriginated;
}
/**
* Item expand event listener.
*
* @param <T>
* the expanded item's type
* @since 8.1
*/
@FunctionalInterface
public interface ExpandListener<T> extends SerializableEventListener {
public static final Method EXPAND_METHOD = ReflectTools.findMethod(
ExpandListener.class, "itemExpand", ExpandEvent.class);
/**
* Callback method for when an item has been expanded.
*
* @param event
* the expand event
*/
public void itemExpand(ExpandEvent<T> event);
}
}
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