eu.etaxonomy.taxeditor.editor/src/main/java/eu/etaxonomy/taxeditor/editor/view/derivate/DerivateDropListener.java

   1 // $Id$
   2 /**
   3 * Copyright (C) 2014 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 package eu.etaxonomy.taxeditor.editor.view.derivate;
  11
  12 import org.eclipse.jface.util.LocalSelectionTransfer;
  13 import org.eclipse.jface.viewers.IStructuredSelection;
  14 import org.eclipse.jface.viewers.TreeNode;
  15 import org.eclipse.jface.viewers.ViewerDropAdapter;
  16 import org.eclipse.swt.dnd.TransferData;
  17
  18 import eu.etaxonomy.cdm.model.occurrence.DerivationEvent;
  19 import eu.etaxonomy.cdm.model.occurrence.DerivedUnit;
  20 import eu.etaxonomy.cdm.model.occurrence.SpecimenOrObservationBase;
  21 import eu.etaxonomy.cdm.model.occurrence.SpecimenOrObservationType;
  22
  23 /**
  24  * @author pplitzner
  25  * @date 18.03.2014
  26  *
  27  */
  28 public class DerivateDropListener extends ViewerDropAdapter {
  29
  30     private final DerivateView derivateView;
  31
  32     /**
  33      * @param derivateView
  34      */
  35     protected DerivateDropListener(DerivateView derivateView) {
  36         super(derivateView.viewer);
  37         this.derivateView = derivateView;
  38     }
  39
  40     /* (non-Javadoc)
  41      * @see org.eclipse.jface.viewers.ViewerDropAdapter#performDrop(java.lang.Object)
  42      */
  43     @Override
  44     public boolean performDrop(Object data) {
  45         Object target = getCurrentTarget();
  46         if(target instanceof TreeNode && data instanceof IStructuredSelection && ((IStructuredSelection) data).size()==1 && ((IStructuredSelection) data).getFirstElement() instanceof TreeNode){
  47             TreeNode targetNode = (TreeNode) target;
  48             TreeNode draggednode = (TreeNode) ((IStructuredSelection) data).getFirstElement();
  49             if(moveDropTarget(draggednode, targetNode)){
  50                 derivateView.changed(null);
  51                 return true;
  52             }
  53         }
  54         return false;
  55     }
  56
  57     /* (non-Javadoc)
  58      * @see org.eclipse.jface.viewers.ViewerDropAdapter#validateDrop(java.lang.Object, int, org.eclipse.swt.dnd.TransferData)
  59      */
  60     @Override
  61     public boolean validateDrop(Object target, int operation, TransferData transferType) {
  62         return LocalSelectionTransfer.getTransfer().isSupportedType(transferType) && target instanceof TreeNode;
  63     }
  64
  65     /**
  66      * @param value
  67      * @return
  68      */
  69     private boolean moveDropTarget(TreeNode draggedObject, TreeNode target) {
  70         if(draggedObject.getValue() instanceof DerivedUnit && target.getValue() instanceof SpecimenOrObservationBase<?>){
  71             DerivedUnit draggedSpecimen = (DerivedUnit) draggedObject.getValue();
  72             SpecimenOrObservationBase<?> targetSpecimen = (SpecimenOrObservationBase<?>) target.getValue();
  73             SpecimenOrObservationType dragType = draggedSpecimen.getRecordBasis();
  74             SpecimenOrObservationType targetType = targetSpecimen.getRecordBasis();
  75             //check if type is a sub derivate type
  76             TreeNode parentNode = draggedObject.getParent();
  77             if(parentNode!=null && !parentNode.equals(target) //don't drag on direct parent node
  78                     && (targetType==SpecimenOrObservationType.FieldUnit //dragging on FieldUnit always works (except when direct parent)
  79                     || (dragType.isKindOf(targetType) && targetType!=dragType))){ //dragging only on parent derivate type
  80                 //remove derivation event from parent specimen of dragged object
  81                 DerivationEvent eventToRemove = null;
  82                 if(parentNode.getValue() instanceof SpecimenOrObservationBase<?>){
  83                     SpecimenOrObservationBase<?> parentDragSpecimen = (SpecimenOrObservationBase<?>) parentNode.getValue();
  84                     for(DerivationEvent event:parentDragSpecimen.getDerivationEvents()){
  85                         if(event.getDerivatives().contains(draggedSpecimen)){
  86                             eventToRemove = event;
  87                             break;
  88                         }
  89                     }
  90                     parentDragSpecimen.removeDerivationEvent(eventToRemove);
  91                 }
  92                 //add new derivation event to target
  93                 targetSpecimen.addDerivationEvent(DerivationEvent.NewSimpleInstance(targetSpecimen, draggedSpecimen, eventToRemove==null?null:eventToRemove.getType()));
  94                 return true;
  95             }
  96         }
  97         return false;
  98     }
  99
 100 }