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

   1 /**
   2 * Copyright (C) 2014 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 package eu.etaxonomy.taxeditor.editor.view.derivate;
  10
  11 import org.eclipse.core.runtime.Status;
  12 import org.eclipse.jface.util.LocalSelectionTransfer;
  13 import org.eclipse.jface.viewers.TreeNode;
  14 import org.eclipse.jface.viewers.ViewerDropAdapter;
  15 import org.eclipse.swt.dnd.DND;
  16 import org.eclipse.swt.dnd.DropTargetEvent;
  17 import org.eclipse.swt.dnd.TransferData;
  18
  19 import eu.etaxonomy.taxeditor.editor.EditorUtil;
  20 import eu.etaxonomy.taxeditor.editor.Messages;
  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     @Override
  40     public boolean performDrop(Object data) {
  41         if(derivateView.isDirty()){
  42             MessagingUtils.warningDialog(DerivateView.VIEW_HAS_UNSAVED_CHANGES, this, DerivateView.YOU_NEED_TO_SAVE_BEFORE_PERFORMING_THIS_ACTION);
  43             return false;
  44         }
  45         Object target = getCurrentTarget();
  46         if(target instanceof TreeNode && data instanceof DerivateViewSelection){
  47             DerivateViewSelection derivateViewSelection = (DerivateViewSelection)data;
  48             TreeNode targetNode = (TreeNode) target;
  49             TreeNode draggedNode = EditorUtil.getTreeNodeOfSelection(derivateViewSelection.getSelection());
  50             if(draggedNode!=null){
  51                 MoveDerivateOperation moveDerivateOperation = new MoveDerivateOperation(String.format(Messages.DerivateDropListener_MOVE_TO, derivateView.getLabelProvider().getDerivateText(draggedNode), derivateView.getLabelProvider().getDerivateText(targetNode)), EditorUtil.getUndoContext(), derivateView, draggedNode, targetNode);
  52                 return AbstractUtility.executeOperation(moveDerivateOperation).equals(Status.OK_STATUS)?true:false;
  53             }
  54         }
  55         return false;
  56     }
  57
  58     @Override
  59     public boolean validateDrop(Object target, int operation, TransferData transferType) {
  60         return LocalSelectionTransfer.getTransfer().isSupportedType(transferType) && target instanceof TreeNode;
  61     }
  62
  63     /**
  64      * {@inheritDoc}
  65      */
  66     @Override
  67     public void dragOver(DropTargetEvent event) {
  68         super.dragOver(event);
  69         event.feedback = DND.FEEDBACK_SELECT | DND.FEEDBACK_SCROLL;
  70     }
  71
  72 }