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.Messages;
  22 import eu.etaxonomy.taxeditor.editor.view.derivate.operation.MoveDerivateOperation;
  23 import eu.etaxonomy.taxeditor.model.AbstractUtility;
  24 import eu.etaxonomy.taxeditor.model.MessagingUtils;
  25
  26 /**
  27  * @author pplitzner
  28  * @date 18.03.2014
  29  *
  30  */
  31 public class DerivateDropListener extends ViewerDropAdapter {
  32
  33     private final DerivateView derivateView;
  34
  35     protected DerivateDropListener(DerivateView derivateView) {
  36         super(derivateView.getViewer());
  37         this.derivateView = derivateView;
  38     }
  39
  40     @Override
  41     public boolean performDrop(Object data) {
  42         if(derivateView.isDirty()){
  43             MessagingUtils.warningDialog(DerivateView.VIEW_HAS_UNSAVED_CHANGES, this, DerivateView.YOU_NEED_TO_SAVE_BEFORE_PERFORMING_THIS_ACTION);
  44             return false;
  45         }
  46         Object target = getCurrentTarget();
  47         if(target instanceof TreeNode && data instanceof DerivateViewSelection){
  48             DerivateViewSelection derivateViewSelection = (DerivateViewSelection)data;
  49             TreeNode targetNode = (TreeNode) target;
  50             TreeNode draggedNode = EditorUtil.getTreeNodeOfSelection(derivateViewSelection.getSelection());
  51             if(draggedNode!=null){
  52                 MoveDerivateOperation moveDerivateOperation = new MoveDerivateOperation(String.format(Messages.DerivateDropListener_MOVE_TO, derivateView.getLabelProvider().getDerivateText(draggedNode), derivateView.getLabelProvider().getDerivateText(targetNode)), EditorUtil.getUndoContext(), derivateView, draggedNode, targetNode);
  53                 return AbstractUtility.executeOperation(moveDerivateOperation).equals(Status.OK_STATUS)?true:false;
  54             }
  55         }
  56         return false;
  57     }
  58
  59     @Override
  60     public boolean validateDrop(Object target, int operation, TransferData transferType) {
  61         return LocalSelectionTransfer.getTransfer().isSupportedType(transferType) && target instanceof TreeNode;
  62     }
  63
  64     /**
  65      * {@inheritDoc}
  66      */
  67     @Override
  68     public void dragOver(DropTargetEvent event) {
  69         super.dragOver(event);
  70         event.feedback = DND.FEEDBACK_SELECT | DND.FEEDBACK_SCROLL;
  71     }
  72
  73 }