eu.etaxonomy.taxeditor.store/src/main/java/eu/etaxonomy/taxeditor/featuretree/e4/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.e4;
  10
  11 import org.eclipse.e4.ui.model.application.ui.MDirtyable;
  12 import org.eclipse.jface.viewers.TreeViewer;
  13 import org.eclipse.jface.viewers.Viewer;
  14 import org.eclipse.jface.viewers.ViewerDropAdapter;
  15 import org.eclipse.swt.dnd.TransferData;
  16
  17 import eu.etaxonomy.cdm.api.service.IFeatureNodeService;
  18 import eu.etaxonomy.cdm.model.description.FeatureNode;
  19 import eu.etaxonomy.cdm.model.description.FeatureTree;
  20 import eu.etaxonomy.taxeditor.featuretree.FeatureNodeTransfer;
  21 import eu.etaxonomy.taxeditor.store.CdmStore;
  22
  23 public class FeatureNodeDropAdapter extends ViewerDropAdapter {
  24
  25     private final MDirtyable dirtyable;
  26
  27     public FeatureNodeDropAdapter(MDirtyable dirtyable, Viewer viewer) {
  28                 super(viewer);
  29         this.dirtyable = dirtyable;
  30         }
  31
  32         @Override
  33         public boolean performDrop(Object data) {
  34                 FeatureNode target = (FeatureNode) getCurrentTarget();
  35                 int position = 0;
  36
  37                 if (target != null) {
  38                         int location = getCurrentLocation();
  39                         FeatureNode parent = target.getParent();
  40                         if (location == LOCATION_BEFORE) {
  41                                 position = Math.max(0, parent.getIndex(target) - 1);
  42                                 target = parent;
  43                         }
  44
  45                         if (location == LOCATION_AFTER) {
  46                                 position = parent.getIndex(target);
  47                                 target = parent;
  48                         }
  49                 }
  50
  51                 // set target to root node if there is no target specified
  52                 if (target == null) {
  53                         FeatureTree featureTree = (FeatureTree) getViewer().getInput();
  54                         target = featureTree.getRoot();
  55                 }
  56
  57                 Object[] droppedObjects = (Object[]) data;
  58                 TreeViewer viewer = (TreeViewer) getViewer();
  59
  60                 // cannot drop a feature node onto itself
  61                 for (Object droppedObject : droppedObjects) {
  62                         if (droppedObject.equals(target)) {
  63                                 return false;
  64                         }
  65                 }
  66                 for (Object droppedObject : droppedObjects) {
  67                         FeatureNode droppedNode = (FeatureNode) droppedObject;
  68                         CdmStore.getService(IFeatureNodeService.class).moveFeatureNode(droppedNode.getUuid(), target.getUuid(), position);
  69                         viewer.refresh();
  70                         viewer.reveal(droppedNode);
  71                 }
  72         this.dirtyable.setDirty(true);
  73                 return true;
  74         }
  75
  76     @Override
  77     public boolean validateDrop(Object target, int operation, TransferData transferData) {
  78         return FeatureNodeTransfer.getInstance().isSupportedType(transferData);
  79     }
  80
  81 }