| /*******************************************************************************
|
| * Copyright (c) 2009, 2019 Mia-Software and others.
|
| * All rights reserved. This program and the accompanying materials
|
| * are made available under the terms of the Eclipse Public License v2.0
|
| * which accompanies this distribution, and is available at
|
| * http://www.eclipse.org/legal/epl-v20.html
|
| *
|
| * Contributors:
|
| * Nicolas Bros (Mia-Software)
|
| *******************************************************************************/ |
| package org.eclipse.modisco.infra.browser.editors;
|
|
|
| import org.eclipse.emf.edit.ui.dnd.LocalTransfer;
|
| import org.eclipse.jface.viewers.ISelection;
|
| import org.eclipse.jface.viewers.IStructuredSelection;
|
| import org.eclipse.jface.viewers.StructuredViewer;
|
| import org.eclipse.swt.dnd.DND;
|
| import org.eclipse.swt.dnd.DragSourceEvent;
|
| import org.eclipse.swt.dnd.DragSourceListener;
|
| import org.eclipse.swt.dnd.Transfer;
|
|
|
| /**
|
| * Adds support for dragging model elements from the browser. The data in the
|
| * D&D operation is set to the unwrapped elements (i.e., the Ecore elements, and
|
| * not the tree items).
|
| */
|
| public final class DragAdapter implements DragSourceListener {
|
|
|
| private ISelection selection;
|
| private final StructuredViewer viewer;
|
|
|
| /** Create support for dragging EObjects from the given tree viewer */
|
| @SuppressWarnings("unused")
|
| public static void create(final StructuredViewer viewer) {
|
| new DragAdapter(viewer);
|
| }
|
|
|
| private DragAdapter(final StructuredViewer viewer) {
|
| this.viewer = viewer;
|
| int dndOperations = DND.DROP_LINK | DND.DROP_COPY | DND.DROP_MOVE;
|
| Transfer[] transfers = new Transfer[] { LocalTransfer.getInstance() };
|
| viewer.addDragSupport(dndOperations, transfers, this);
|
| }
|
|
|
| public void dragStart(final DragSourceEvent event) {
|
| this.selection = this.viewer.getSelection();
|
| }
|
|
|
| public void dragSetData(final DragSourceEvent event) {
|
| if (LocalTransfer.getInstance().isSupportedType(event.dataType)) {
|
| if (this.selection instanceof IStructuredSelection) {
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| IStructuredSelection structuredSelection = (IStructuredSelection) this.selection;
|
| event.data = BrowserUtils.unwrapSelection(structuredSelection);
|
| } else {
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| event.doit = false;
|
| }
|
| }
|
| }
|
|
|
| public void dragFinished(final DragSourceEvent event) {
|
| this.selection = null;
|
| }
|
| }
|
