/*
* 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.client.ui.dd;
import com.vaadin.client.UIDL;
import com.vaadin.ui.dnd.DropTargetExtension;
/**
*
* @author Vaadin Ltd
* @deprecated Replaced in 8.1 with
* {@link DropTargetExtension#setDropCriteria(String)}
*
*/
@Deprecated
public abstract class VAcceptCriterion {
/**
* Checks if current drag event has valid drop target and target accepts the
* transferable. If drop target is valid, callback is used.
*
* @param drag
* @param configuration
* @param callback
*/
public void accept(final VDragEvent drag, UIDL configuration,
final VAcceptCallback callback) {
if (needsServerSideCheck(drag, configuration)) {
VDragEventServerCallback acceptCallback = new VDragEventServerCallback() {
@Override
public void handleResponse(boolean accepted, UIDL response) {
if (accepted) {
callback.accepted(drag);
}
}
};
VDragAndDropManager.get().visitServer(acceptCallback);
} else {
boolean validates = accept(drag, configuration);
if (validates) {
callback.accepted(drag);
}
}
}
protected abstract boolean accept(VDragEvent drag, UIDL configuration);
public boolean needsServerSideCheck(VDragEvent drag, UIDL criterioUIDL) {
return false;
}
}