eu.etaxonomy.taxeditor.store/src/main/java/eu/etaxonomy/taxeditor/featuretree/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;
  10
  11 import org.eclipse.jface.viewers.IStructuredSelection;
  12 import org.eclipse.jface.viewers.TreeViewer;
  13 import org.eclipse.swt.dnd.DND;
  14 import org.eclipse.swt.dnd.DragSourceAdapter;
  15 import org.eclipse.swt.dnd.DragSourceEvent;
  16
  17 import eu.etaxonomy.cdm.model.description.FeatureNode;
  18
  19 /**
  20  * @author pplitzner
  21  * @since Jun 2, 2017
  22  *
  23  */
  24 public class FeatureNodeDragListener extends DragSourceAdapter {
  25
  26     private final TreeViewer viewer;
  27
  28     public FeatureNodeDragListener(TreeViewer viewer) {
  29         this.viewer = viewer;
  30     }
  31
  32     /**
  33      * Method declared on DragSourceListener
  34      */
  35     @Override
  36     public void dragFinished(DragSourceEvent event) {
  37         if (!event.doit) {
  38             return;
  39         }
  40         if (event.detail == DND.DROP_MOVE) {
  41             viewer.refresh();
  42         }
  43     }
  44
  45     /**
  46      * Method declared on DragSourceListener
  47      */
  48     @Override
  49     public void dragSetData(DragSourceEvent event) {
  50         IStructuredSelection selection = (IStructuredSelection) viewer
  51                 .getSelection();
  52         FeatureNode[] featureNodes = (FeatureNode[]) selection.toList()
  53                 .toArray(new FeatureNode[selection.size()]);
  54         if (FeatureNodeTransfer.getInstance().isSupportedType(
  55                 event.dataType)) {
  56             event.data = featureNodes;
  57         }
  58     }
  59
  60     /**
  61      * Method declared on DragSourceListener
  62      */
  63     @Override
  64     public void dragStart(DragSourceEvent event) {
  65         event.doit = !viewer.getSelection().isEmpty();
  66     }
  67
  68 }