eu.etaxonomy.taxeditor.store/src/main/java/eu/etaxonomy/taxeditor/featuretree/e4/FeatureNodeDragListener.java

   1 /**
   2 * Copyright (C) 2017 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.featuretree.e4;
  10
  11 import org.eclipse.jface.viewers.IStructuredSelection;
  12 import org.eclipse.jface.viewers.TreeViewer;
  13 import org.eclipse.swt.dnd.DragSourceAdapter;
  14 import org.eclipse.swt.dnd.DragSourceEvent;
  15
  16 import eu.etaxonomy.cdm.model.description.Feature;
  17 import eu.etaxonomy.cdm.model.term.TermNode;
  18 import eu.etaxonomy.taxeditor.featuretree.FeatureNodeTransfer;
  19
  20 public class FeatureNodeDragListener extends DragSourceAdapter {
  21
  22         private final TreeViewer viewer;
  23
  24         public FeatureNodeDragListener(TreeViewer viewer) {
  25                 this.viewer = viewer;
  26         }
  27
  28     /**
  29      * Method declared on DragSourceListener
  30      */
  31     @Override
  32     public void dragSetData(DragSourceEvent event) {
  33         IStructuredSelection selection = (IStructuredSelection) viewer.getSelection();
  34         if(selection!=null && !selection.isEmpty()){
  35             TermNode<Feature>[] featureNodes = (TermNode<Feature>[]) selection.toList().toArray(new TermNode[selection.size()]);
  36             if (FeatureNodeTransfer.getInstance().isSupportedType(event.dataType)) {
  37                 event.data = featureNodes;
  38             }
  39         }
  40     }
  41
  42         /**
  43          * Method declared on DragSourceListener
  44          */
  45         @Override
  46         public void dragStart(DragSourceEvent event) {
  47         event.doit = !viewer.getSelection().isEmpty()
  48                 && ((IStructuredSelection) viewer.getSelection()).toList()
  49                 .stream().allMatch(element -> element instanceof TermNode);
  50         }
  51
  52 }