/*
* 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.ui.dnd.event;
import java.lang.reflect.Method;
import com.vaadin.event.ConnectorEventListener;
import com.vaadin.ui.AbstractComponent;
import com.vaadin.ui.dnd.DragSourceExtension;
/**
* Interface to be implemented when creating a dragstart listener on a drag
* source for HTML5 drag and drop.
*
* @param <T>
* Type of draggable component.
* @author Vaadin Ltd
* @see DragSourceExtension#addDragStartListener(DragStartListener)
* @since 8.1
*/
@FunctionalInterface
public interface DragStartListener<T extends AbstractComponent> extends
ConnectorEventListener {
static final Method DRAGSTART_METHOD = DragStartListener.class
.getDeclaredMethods()[0];
/**
* Called when dragstart event is fired.
*
* @param event
* Server side dragstart event.
*/
void dragStart(DragStartEvent<T> event);
}