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.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 import eu.etaxonomy.taxeditor.featuretree.FeatureNodeTransfer;
  19
  20 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 dragFinished(DragSourceEvent event) {
  33                 if (!event.doit) {
  34             return;
  35         }
  36                 // if the featureNode was moved, remove it from the source viewer
  37                 if (event.detail == DND.DROP_MOVE) {
  38                         IStructuredSelection selection = (IStructuredSelection) viewer
  39                                         .getSelection();
  40                         viewer.remove(selection);
  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 }