1 /*******************************************************************************
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2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
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3 * in Industry THTH ry.
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4 * All rights reserved. This program and the accompanying materials
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5 * are made available under the terms of the Eclipse Public License v1.0
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6 * which accompanies this distribution, and is available at
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7 * http://www.eclipse.org/legal/epl-v10.html
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10 * VTT Technical Research Centre of Finland - initial API and implementation
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11 *******************************************************************************/
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12 package org.simantics.ui.dnd;
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14 import org.eclipse.jface.viewers.ISelection;
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15 import org.eclipse.jface.viewers.ISelectionProvider;
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16 import org.eclipse.swt.dnd.DragSourceEvent;
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17 import org.eclipse.swt.dnd.DragSourceListener;
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18 import org.eclipse.swt.dnd.DropTargetListener;
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21 * An SWT drag source listener that provides the specified selection provider's
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22 * {@link ISelection} as the dragged data to {@link DropTargetListener}s.
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25 * Only guaranteed to work with {@link LocalObjectTransfer} which will only work
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26 * within a single application.
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28 * @author Tuukka Lehtonen
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30 public class LocalSelectionDragSourceListener implements DragSourceListener {
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32 ISelectionProvider selectionProvider;
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33 ISelection selection;
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35 public LocalSelectionDragSourceListener(ISelectionProvider selectionProvider) {
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36 this.selectionProvider = selectionProvider;
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39 public ISelection getSelection() {
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44 public void dragFinished(DragSourceEvent event) {
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45 //System.out.println("SOURCE FINISH " + event);
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46 LocalObjectTransfer.getTransfer().clear();
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51 public void dragSetData(DragSourceEvent event) {
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52 //System.out.println("SOURCE PUT " + event + " " + selection);
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53 event.data = selection;
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54 LocalObjectTransfer.getTransfer().setObject(selection);
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59 public void dragStart(DragSourceEvent event) {
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60 //System.out.println("SOURCE START " + event + " " + selectionProvider.getSelection());
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61 selection = selectionProvider.getSelection();
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62 if (selection == null || selection.isEmpty())
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66 LocalObjectTransfer.getTransfer().setObject(selection);
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