/*******************************************************************************
* Copyright 2012 Geoscience Australia
*
* 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 au.gov.ga.earthsci.catalog.ui;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.swt.dnd.DragSourceEvent;
import org.eclipse.swt.dnd.DragSourceListener;
import au.gov.ga.earthsci.catalog.CatalogLayerHelper;
import au.gov.ga.earthsci.catalog.ICatalogTreeNode;
import au.gov.ga.earthsci.layer.tree.ILayerTreeNode;
import au.gov.ga.earthsci.layer.ui.dnd.LayerTransfer;
import au.gov.ga.earthsci.layer.ui.dnd.LayerTransferData;
/**
* {@link DragSourceListener} implementation for the catalog browser tree
*
* @author James Navin (james.navin@ga.gov.au)
*/
public class CatalogTreeDragSourceListener implements DragSourceListener
{
private final TreeViewer viewer;
private final ICatalogBrowserController controller;
public CatalogTreeDragSourceListener(TreeViewer viewer, ICatalogBrowserController controller)
{
this.viewer = viewer;
this.controller = controller;
}
@Override
public void dragStart(DragSourceEvent event)
{
if (viewer.getSelection().isEmpty())
{
event.doit = false;
}
else
{
event.doit = controller.areAllLayerNodes(getSelectedCatalogNodes());
}
}
@Override
public void dragSetData(DragSourceEvent event)
{
if (LayerTransfer.getInstance().isSupportedType(event.dataType))
{
doLayerTransfer(event);
return;
}
}
private void doLayerTransfer(DragSourceEvent event)
{
ICatalogTreeNode[] selectedCatalogNodes = getSelectedCatalogNodes();
List<ILayerTreeNode> layerTreeNodes = new ArrayList<ILayerTreeNode>();
for (ICatalogTreeNode node : selectedCatalogNodes)
{
if (node == null || !node.isLayerNode())
{
continue;
}
ILayerTreeNode layerTreeNode = CatalogLayerHelper.createLayerTreeNode(node);
layerTreeNodes.add(layerTreeNode);
}
LayerTransferData transferData =
LayerTransferData.fromNodes(layerTreeNodes.toArray(new ILayerTreeNode[layerTreeNodes.size()]));
event.data = transferData;
}
private ICatalogTreeNode[] getSelectedCatalogNodes()
{
IStructuredSelection selection = (IStructuredSelection) viewer.getSelection();
List<?> selectionList = selection.toList();
ICatalogTreeNode[] nodes = selectionList.toArray(new ICatalogTreeNode[selectionList.size()]);
return nodes;
}
@Override
public void dragFinished(DragSourceEvent event)
{
// Do nothing
}
}