/*******************************************************************************
* Copyright 2009, 2010 Lars Grammel
*
* 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 org.thechiselgroup.choosel.dnd.client.resources;
import org.thechiselgroup.choosel.core.client.resources.ResourceSet;
import org.thechiselgroup.choosel.core.client.resources.ui.HighlightingResourceSetAvatarFactory;
import org.thechiselgroup.choosel.core.client.resources.ui.ResourceSetAvatar;
import org.thechiselgroup.choosel.core.client.resources.ui.ResourceSetAvatarFactory;
import org.thechiselgroup.choosel.core.client.util.Disposable;
import org.thechiselgroup.choosel.core.client.visualization.model.extensions.HighlightingModel;
import com.allen_sauer.gwt.dnd.client.DragEndEvent;
import com.allen_sauer.gwt.dnd.client.DragHandler;
import com.allen_sauer.gwt.dnd.client.DragHandlerAdapter;
/**
* This class should be used instead of
* {@link HighlightingResourceSetAvatarFactory} if the resource set avatars are
* draggable.
*
* @author Lars Grammel
*/
public class HighlightingDraggableResourceSetAvatarFactory extends
HighlightingResourceSetAvatarFactory {
private final ResourceSetAvatarDragController dragController;
public HighlightingDraggableResourceSetAvatarFactory(
ResourceSetAvatarFactory delegate, HighlightingModel hoverModel,
ResourceSetAvatarDragController dragController) {
super(delegate, hoverModel);
assert dragController != null;
this.dragController = dragController;
}
private void addDragHandler(DragHandler handler) {
dragController.addDragHandler(handler);
}
@Override
public ResourceSetAvatar createAvatar(ResourceSet resources) {
final ResourceSetAvatar avatar = super.createAvatar(resources);
/**
* Removes the hover at the end of a drag and drop operation. Because
* the resource set is already hovered, this saves the effort of
* highlighting the resources again.
*/
final DragHandlerAdapter dragHandler = new DragHandlerAdapter() {
@Override
public void onDragEnd(DragEndEvent event) {
removeFromHover();
}
};
addDragHandler(dragHandler);
avatar.addDisposable(new Disposable() {
@Override
public void dispose() {
removeDragHandler(dragHandler);
}
});
return avatar;
}
private void removeDragHandler(DragHandler handler) {
dragController.removeDragHandler(handler);
}
}