eu.etaxonomy.taxeditor.editor/src/main/java/eu/etaxonomy/taxeditor/editor/view/descriptive/DescriptionElementDropAdapter.java

   1 // $Id$
   2 /**
   3 * Copyright (C) 2007 EDIT
   4 * European Distributed Institute of Taxonomy
   5 * http://www.e-taxonomy.eu
   6 *
   7 * The contents of this file are subject to the Mozilla Public License Version 1.1
   8 * See LICENSE.TXT at the top of this package for the full license terms.
   9 */
  10
  11 package eu.etaxonomy.taxeditor.editor.view.descriptive;
  12
  13 import java.util.ArrayList;
  14 import java.util.Collection;
  15
  16 import org.eclipse.jface.viewers.Viewer;
  17 import org.eclipse.jface.viewers.ViewerDropAdapter;
  18 import org.eclipse.swt.dnd.DND;
  19 import org.eclipse.swt.dnd.TransferData;
  20
  21 import eu.etaxonomy.cdm.model.description.DescriptionElementBase;
  22 import eu.etaxonomy.cdm.model.description.TaxonDescription;
  23 import eu.etaxonomy.taxeditor.editor.EditorUtil;
  24 import eu.etaxonomy.taxeditor.editor.view.descriptive.operation.MoveDescriptionElementsOperation;
  25 import eu.etaxonomy.taxeditor.model.MessagingUtils;
  26 import eu.etaxonomy.taxeditor.operation.AbstractPostOperation;
  27
  28 /**
  29  * @author n.hoffmann
  30  * @created Feb 8, 2011
  31  * @version 1.0
  32  */
  33 public class DescriptionElementDropAdapter extends ViewerDropAdapter {
  34
  35         /**
  36          * @param viewer
  37          */
  38         public DescriptionElementDropAdapter(Viewer viewer) {
  39                 super(viewer);
  40         }
  41
  42         /* (non-Javadoc)
  43          * @see org.eclipse.jface.viewers.ViewerDropAdapter#performDrop(java.lang.Object)
  44          */
  45         @Override
  46         public boolean performDrop(Object data) {
  47                 TaxonDescription target = (TaxonDescription) getCurrentTarget();
  48                 Object[] droppedElements = (Object[]) data;
  49
  50                 Collection<DescriptionElementBase> descriptionElements = new ArrayList<DescriptionElementBase>();
  51
  52                 boolean isCopy = getCurrentOperation() == DND.DROP_COPY ? true : false;
  53
  54                 // cannot drop a feature node onto itself
  55                 if (droppedElements != null){
  56                         for (Object droppedElement : droppedElements) {
  57                                 if (droppedElement == null){
  58                                         MessagingUtils.warningDialog("Operation not supported yet", this, "We are currently unable to drag and drop a newly created element. Please save the editor to make this work.");
  59                                         return false;
  60                                 }
  61                                 if(! (droppedElement instanceof DescriptionElementBase)){
  62                                         return false;
  63                                 }else{
  64                                         DescriptionElementBase descriptionElement = (DescriptionElementBase) droppedElement;
  65
  66                                         if (descriptionElement.getInDescription().equals(target)) {
  67                                                 return false;
  68                                         }
  69
  70                                         descriptionElements.add(descriptionElement);
  71                                 }
  72                         }
  73
  74                         AbstractPostOperation operation = new MoveDescriptionElementsOperation("Move Descriptions", EditorUtil.getUndoContext(), target, descriptionElements, isCopy, null);
  75
  76                         EditorUtil.executeOperation(operation);
  77                         return true;
  78                 }
  79                 MessagingUtils.warningDialog("Operation not supported yet", this, "We are unable to drag and drop empty descriptions");
  80
  81                 return false;
  82
  83         }
  84
  85         /* (non-Javadoc)
  86          * @see org.eclipse.jface.viewers.ViewerDropAdapter#validateDrop(java.lang.Object, int, org.eclipse.swt.dnd.TransferData)
  87          */
  88         @Override
  89         public boolean validateDrop(Object target, int operation,
  90                         TransferData transferData) {
  91                 boolean transferDataIsSupported = DescriptionElementTransfer.getInstance().isSupportedType(
  92                                 transferData);
  93                 return target instanceof TaxonDescription && transferDataIsSupported;
  94         }
  95
  96 }