eu.etaxonomy.taxeditor.store/src/main/java/eu/etaxonomy/taxeditor/featuretree/FeatureNodeDropAdapter.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.TreeViewer;
  12 import org.eclipse.jface.viewers.Viewer;
  13 import org.eclipse.jface.viewers.ViewerDropAdapter;
  14 import org.eclipse.swt.dnd.TransferData;
  15
  16 import eu.etaxonomy.cdm.model.description.FeatureNode;
  17 import eu.etaxonomy.cdm.model.description.FeatureTree;
  18 import eu.etaxonomy.taxeditor.model.MessagingUtils;
  19
  20 /**
  21  * @author pplitzner
  22  * @since Jun 2, 2017
  23  *
  24  */
  25 public class FeatureNodeDropAdapter extends ViewerDropAdapter {
  26
  27     public FeatureNodeDropAdapter(Viewer viewer) {
  28         super(viewer);
  29     }
  30
  31     @Override
  32     public boolean performDrop(Object data) {
  33         FeatureNode target = (FeatureNode) getCurrentTarget();
  34         int position = 0;
  35
  36         if (target != null) {
  37             int location = getCurrentLocation();
  38             FeatureNode parent = target.getParent();
  39             if (location == LOCATION_BEFORE) {
  40                 position = Math.max(0, parent.getIndex(target) - 1);
  41                 target = parent;
  42             }
  43
  44             if (location == LOCATION_AFTER) {
  45                 position = parent.getIndex(target);
  46                 target = parent;
  47             }
  48         }
  49
  50         // set target to root node if there is no target specified
  51         if (target == null) {
  52             FeatureTree featureTree = (FeatureTree) getViewer().getInput();
  53             target = featureTree.getRoot();
  54         }
  55
  56         Object[] droppedObjects = (Object[]) data;
  57         TreeViewer viewer = (TreeViewer) getViewer();
  58
  59         // cannot drop a feature node onto itself
  60         for (Object droppedObject : droppedObjects) {
  61             if (droppedObject == null) {
  62                 MessagingUtils.warningDialog(
  63                                 "Operation not supported yet",
  64                                 this,
  65                                 "We are currently unable to change the order of freshly created "
  66                                         + "feature trees nodes. Please close and reopen the dialog to change the order of features.");
  67                 return false;
  68             }
  69             if (droppedObject.equals(target)) {
  70                 return false;
  71             }
  72         }
  73         for (Object droppedObject : droppedObjects) {
  74             FeatureNode droppedNode = (FeatureNode) droppedObject;
  75             target.addChild(droppedNode, position);
  76             viewer.add(target, droppedNode);
  77             viewer.reveal(droppedNode);
  78         }
  79         return true;
  80     }
  81
  82     @Override
  83     public boolean validateDrop(Object target, int operation,
  84             TransferData transferData) {
  85         return FeatureNodeTransfer.getInstance().isSupportedType(
  86                 transferData);
  87     }
  88
  89 }