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.core.runtime.Status;
  13 import org.eclipse.jface.util.LocalSelectionTransfer;
  14 import org.eclipse.jface.viewers.TreeNode;
  15 import org.eclipse.jface.viewers.ViewerDropAdapter;
  16 import org.eclipse.swt.dnd.DND;
  17 import org.eclipse.swt.dnd.DropTargetEvent;
  18 import org.eclipse.swt.dnd.TransferData;
  19
  20 import eu.etaxonomy.taxeditor.editor.EditorUtil;
  21 import eu.etaxonomy.taxeditor.editor.view.derivate.operation.MoveDerivateOperation;
  22 import eu.etaxonomy.taxeditor.model.AbstractUtility;
  23 import eu.etaxonomy.taxeditor.model.MessagingUtils;
  24
  25 /**
  26  * @author pplitzner
  27  * @date 18.03.2014
  28  *
  29  */
  30 public class DerivateDropListener extends ViewerDropAdapter {
  31
  32     private final DerivateView derivateView;
  33
  34     protected DerivateDropListener(DerivateView derivateView) {
  35         super(derivateView.getViewer());
  36         this.derivateView = derivateView;
  37     }
  38
  39     /* (non-Javadoc)
  40      * @see org.eclipse.jface.viewers.ViewerDropAdapter#performDrop(java.lang.Object)
  41      */
  42     @Override
  43     public boolean performDrop(Object data) {
  44         if(derivateView.isDirty()){
  45             MessagingUtils.warningDialog("View has unsaved changes", this, "You need to save before performing this action");
  46             return false;
  47         }
  48         Object target = getCurrentTarget();
  49         if(target instanceof TreeNode && data instanceof DerivateViewSelection){
  50             DerivateViewSelection derivateViewSelection = (DerivateViewSelection)data;
  51             TreeNode targetNode = (TreeNode) target;
  52             TreeNode draggedNode = EditorUtil.getTreeNodeOfSelection(derivateViewSelection.getSelection());
  53             if(draggedNode!=null){
  54                 MoveDerivateOperation moveDerivateOperation = new MoveDerivateOperation("Moving \""+derivateView.getLabelProvider().getDerivateText(draggedNode)+"\" to \""+derivateView.getLabelProvider().getDerivateText(targetNode)+"\"", EditorUtil.getUndoContext(), derivateView, draggedNode, targetNode);
  55                 return AbstractUtility.executeOperation(moveDerivateOperation).equals(Status.OK_STATUS)?true:false;
  56             }
  57         }
  58         return false;
  59     }
  60
  61     /* (non-Javadoc)
  62      * @see org.eclipse.jface.viewers.ViewerDropAdapter#validateDrop(java.lang.Object, int, org.eclipse.swt.dnd.TransferData)
  63      */
  64     @Override
  65     public boolean validateDrop(Object target, int operation, TransferData transferType) {
  66         return LocalSelectionTransfer.getTransfer().isSupportedType(transferType) && target instanceof TreeNode;
  67     }
  68
  69     /**
  70      * {@inheritDoc}
  71      */
  72     @Override
  73     public void dragOver(DropTargetEvent event) {
  74         super.dragOver(event);
  75         event.feedback = DND.FEEDBACK_SELECT | DND.FEEDBACK_SCROLL;
  76     }
  77
  78 }