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.FeatureNode;
  17 import eu.etaxonomy.taxeditor.featuretree.FeatureNodeTransfer;
  18
  19 class FeatureNodeDragListener extends DragSourceAdapter {
  20
  21         private final TreeViewer viewer;
  22
  23         public FeatureNodeDragListener(TreeViewer viewer) {
  24                 this.viewer = viewer;
  25         }
  26
  27     /**
  28      * Method declared on DragSourceListener
  29      */
  30     @Override
  31     public void dragSetData(DragSourceEvent event) {
  32         IStructuredSelection selection = (IStructuredSelection) viewer.getSelection();
  33         FeatureNode[] featureNodes = (FeatureNode[]) selection.toList().toArray(new FeatureNode[selection.size()]);
  34         if (FeatureNodeTransfer.getInstance().isSupportedType(event.dataType)) {
  35             event.data = featureNodes;
  36         }
  37     }
  38
  39         /**
  40          * Method declared on DragSourceListener
  41          */
  42         @Override
  43         public void dragStart(DragSourceEvent event) {
  44                 event.doit = !viewer.getSelection().isEmpty();
  45         }
  46
  47 }