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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.e4;
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import org.eclipse.jface.viewers.ISelection;
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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.DragSourceAdapter;
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import org.eclipse.swt.dnd.DragSourceEvent;
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import eu.etaxonomy.cdm.model.term.TermNode;
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import eu.etaxonomy.taxeditor.featuretree.TermNodeTransfer;
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public class TermNodeDragListener extends DragSourceAdapter {
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private final TreeViewer viewer;
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public TermNodeDragListener(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 dragSetData(DragSourceEvent event) {
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IStructuredSelection selection = (IStructuredSelection) viewer.getSelection();
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if(selection!=null && !selection.isEmpty()){
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TermNode[] featureNodes = (TermNode[]) selection.toList().toArray(new TermNode[selection.size()]);
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if (TermNodeTransfer.getInstance().isSupportedType(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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/**
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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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ISelection sel = viewer.getSelection();
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event.doit = !viewer.getSelection().isEmpty()
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&& ((IStructuredSelection) viewer.getSelection()).toList()
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.stream().allMatch(element -> element instanceof TermNode);
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}
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}
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