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/**
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* Copyright (C) 2017 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package eu.etaxonomy.taxeditor.featuretree;
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import org.eclipse.jface.viewers.IStructuredSelection;
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import org.eclipse.jface.viewers.TreeViewer;
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import org.eclipse.swt.dnd.DND;
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import org.eclipse.swt.dnd.DragSourceAdapter;
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import org.eclipse.swt.dnd.DragSourceEvent;
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import eu.etaxonomy.cdm.model.description.FeatureNode;
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/**
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* @author pplitzner
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* @since Jun 2, 2017
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*
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*/
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public class FeatureNodeDragListener extends DragSourceAdapter {
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private final TreeViewer viewer;
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public FeatureNodeDragListener(TreeViewer viewer) {
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this.viewer = viewer;
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}
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/**
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* Method declared on DragSourceListener
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*/
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@Override
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public void dragFinished(DragSourceEvent event) {
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if (!event.doit) {
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return;
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}
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if (event.detail == DND.DROP_MOVE) {
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viewer.refresh();
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}
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}
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/**
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* Method declared on DragSourceListener
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*/
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@Override
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public void dragSetData(DragSourceEvent event) {
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IStructuredSelection selection = (IStructuredSelection) viewer
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.getSelection();
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FeatureNode[] featureNodes = (FeatureNode[]) selection.toList()
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.toArray(new FeatureNode[selection.size()]);
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if (FeatureNodeTransfer.getInstance().isSupportedType(
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event.dataType)) {
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event.data = featureNodes;
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}
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}
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/**
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* Method declared on DragSourceListener
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*/
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@Override
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public void dragStart(DragSourceEvent event) {
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event.doit = !viewer.getSelection().isEmpty();
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}
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}
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