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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.TreeViewer;
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import org.eclipse.jface.viewers.Viewer;
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import org.eclipse.jface.viewers.ViewerDropAdapter;
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import org.eclipse.swt.dnd.TransferData;
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import eu.etaxonomy.cdm.model.description.FeatureNode;
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import eu.etaxonomy.cdm.model.description.FeatureTree;
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import eu.etaxonomy.taxeditor.featuretree.FeatureNodeTransfer;
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import eu.etaxonomy.taxeditor.model.MessagingUtils;
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class FeatureNodeDropAdapter extends ViewerDropAdapter {
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/**
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*
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*/
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private final FeatureTreeEditor featureTreeEditor;
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protected FeatureNodeDropAdapter(FeatureTreeEditor featureTreeEditor, Viewer viewer) {
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super(viewer);
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this.featureTreeEditor = featureTreeEditor;
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}
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@Override
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public boolean performDrop(Object data) {
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FeatureNode target = (FeatureNode) getCurrentTarget();
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int position = 0;
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if (target != null) {
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int location = getCurrentLocation();
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FeatureNode parent = target.getParent();
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if (location == LOCATION_BEFORE) {
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position = Math.max(0, parent.getIndex(target) - 1);
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target = parent;
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}
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if (location == LOCATION_AFTER) {
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position = parent.getIndex(target);
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target = parent;
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}
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}
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// set target to root node if there is no target specified
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if (target == null) {
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FeatureTree featureTree = (FeatureTree) getViewer().getInput();
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target = featureTree.getRoot();
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}
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Object[] droppedObjects = (Object[]) data;
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TreeViewer viewer = (TreeViewer) getViewer();
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// cannot drop a feature node onto itself
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for (Object droppedObject : droppedObjects) {
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if (droppedObject == null) {
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MessagingUtils.warningDialog(
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"Operation not supported yet",
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this,
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"We are currently unable to change the order of freshly created "
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+ "feature trees nodes. Please close and reopen the dialog to change the order of features.");
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return false;
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}
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if (droppedObject.equals(target)) {
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return false;
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}
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}
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for (Object droppedObject : droppedObjects) {
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FeatureNode droppedNode = (FeatureNode) droppedObject;
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target.addChild(droppedNode, position);
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viewer.add(target, droppedNode);
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viewer.reveal(droppedNode);
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}
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this.featureTreeEditor.setDirty(true);
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return true;
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}
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@Override
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public boolean validateDrop(Object target, int operation,
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TransferData transferData) {
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return FeatureNodeTransfer.getInstance().isSupportedType(
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transferData);
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}
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}
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