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

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