eu.etaxonomy.taxeditor.store/src/main/java/eu/etaxonomy/taxeditor/featuretree/e4/FeatureNodeDtoDragListener.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.ISelection;
  12 import org.eclipse.jface.viewers.IStructuredSelection;
  13 import org.eclipse.jface.viewers.TreeSelection;
  14 import org.eclipse.jface.viewers.TreeViewer;
  15 import org.eclipse.swt.dnd.DragSourceAdapter;
  16 import org.eclipse.swt.dnd.DragSourceEvent;
  17
  18 import eu.etaxonomy.cdm.model.term.TermNode;
  19 import eu.etaxonomy.cdm.persistence.dto.TermNodeDto;
  20 import eu.etaxonomy.taxeditor.featuretree.FeatureNodeDtoTransfer;
  21
  22 public class FeatureNodeDtoDragListener extends DragSourceAdapter {
  23
  24         private final TreeViewer viewer;
  25
  26         public FeatureNodeDtoDragListener(TreeViewer viewer) {
  27                 this.viewer = viewer;
  28         }
  29
  30     /**
  31      * Method declared on DragSourceListener
  32      */
  33     @Override
  34     public void dragSetData(DragSourceEvent event) {
  35         IStructuredSelection selection = (IStructuredSelection) viewer.getSelection();
  36         if(selection!=null && !selection.isEmpty()){
  37             if (selection instanceof TreeSelection && ((TreeSelection)selection).getFirstElement() instanceof TermNodeDto){
  38                 TermNodeDto[] featureNodes = (TermNodeDto[]) selection.toList().toArray(new TermNodeDto[selection.size()]);
  39                 if (FeatureNodeDtoTransfer.getInstance().isSupportedType(event.dataType)) {
  40                     event.data = featureNodes;
  41                 }
  42             }
  43         }
  44
  45     }
  46
  47         /**
  48          * Method declared on DragSourceListener
  49          */
  50         @Override
  51         public void dragStart(DragSourceEvent event) {
  52             ISelection sel = viewer.getSelection();
  53             if (sel instanceof TreeSelection && ((TreeSelection)sel).getFirstElement() instanceof TermNodeDto){
  54             event.doit = !viewer.getSelection().isEmpty()
  55                     && ((IStructuredSelection) viewer.getSelection()).toList()
  56                     .stream().allMatch(element -> element instanceof TermNodeDto);
  57             }else {
  58                 event.doit = !viewer.getSelection().isEmpty()
  59                     && ((IStructuredSelection) viewer.getSelection()).toList()
  60                     .stream().allMatch(element -> element instanceof TermNode);
  61             }
  62         }
  63
  64 }