eu.etaxonomy.taxeditor.editor/src/main/java/eu/etaxonomy/taxeditor/editor/view/derivate/DerivateDragListener.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.ISelection;
  14 import org.eclipse.swt.dnd.DragSourceAdapter;
  15 import org.eclipse.swt.dnd.DragSourceEvent;
  16
  17 import eu.etaxonomy.taxeditor.editor.EditorUtil;
  18 import eu.etaxonomy.taxeditor.model.MessagingUtils;
  19
  20 /**
  21  * @author pplitzner
  22  * @date 18.03.2014
  23  *
  24  */
  25 public class DerivateDragListener extends DragSourceAdapter{
  26
  27     private final DerivateView derivateView;
  28
  29     /**
  30      * @param derivateView
  31      */
  32     public DerivateDragListener(DerivateView derivateView) {
  33         this.derivateView = derivateView;
  34     }
  35
  36     /* (non-Javadoc)
  37      * @see org.eclipse.swt.dnd.DragSourceAdapter#dragSetData(org.eclipse.swt.dnd.DragSourceEvent)
  38      */
  39     @Override
  40     public void dragSetData(DragSourceEvent event) {
  41         if (LocalSelectionTransfer.getTransfer().isSupportedType(event.dataType)) {
  42             DerivateViewSelection derivateViewSelection = new DerivateViewSelection(derivateView.getViewer().getSelection(), derivateView);
  43             LocalSelectionTransfer.getTransfer().setSelection(derivateViewSelection);
  44         }
  45     }
  46
  47     /* (non-Javadoc)
  48      * @see org.eclipse.swt.dnd.DragSourceAdapter#dragStart(org.eclipse.swt.dnd.DragSourceEvent)
  49      */
  50     @Override
  51     public void dragStart(DragSourceEvent event) {
  52         if(derivateView.isDirty()){
  53             event.doit = false;
  54             MessagingUtils.warningDialog("View has unsaved changes", this, "You need to save before performing this action");
  55             return;
  56         }
  57         ISelection selection = derivateView.getViewer().getSelection();
  58         if(EditorUtil.getTreeNodeOfSelection(selection)!=null){
  59             event.doit = true;
  60         }
  61         else{
  62             event.doit = false;
  63         }
  64     }
  65 }