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The osx x86_64 swt jar as available in the Eclipse 4.6 (Neon) release for OSX. It is suitable for use with jface and other dependencies available from maven central in the org.eclipse.scout.sdk.deps group. The sources is copied from swt-4.6-cocoa-macosx-x86_64.zip from http://download.eclipse.org/eclipse/downloads/drops4/R-4.6-201606061100/ and javadoc is generated from sources.

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/*******************************************************************************
 * Copyright (c) 2007, 2012 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.dnd;

import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.internal.cocoa.*;
import org.eclipse.swt.widgets.*;

/**
 * This class provides default implementations to display a source image
 * when a drag is initiated from a Tree.
 *
 * Classes that wish to provide their own source image for a Tree can
 * extend TreeDragSourceEffect class and override the TreeDragSourceEffect.dragStart
 * method and set the field DragSourceEvent.image with their own image.
 *
 * Subclasses that override any methods of this class must call the corresponding
 * super method to get the default drag under effect implementation.
 *
 * @see DragSourceEffect
 * @see DragSourceEvent
 * @see Sample code and further information
 *
 * @since 3.3
 */
public class TreeDragSourceEffect extends DragSourceEffect {
	Image dragSourceImage = null;

	/**
	 * Creates a new TreeDragSourceEffect to handle drag effect
	 * from the specified Tree.
	 *
	 * @param tree the Tree that the user clicks on to initiate the drag
	 */
	public TreeDragSourceEffect(Tree tree) {
		super(tree);
	}

	/**
	 * This implementation of dragFinished disposes the image
	 * that was created in TreeDragSourceEffect.dragStart.
	 *
	 * Subclasses that override this method should call super.dragFinished(event)
	 * to dispose the image in the default implementation.
	 *
	 * @param event the information associated with the drag finished event
	 */
	@Override
	public void dragFinished(DragSourceEvent event) {
		if (dragSourceImage != null) dragSourceImage.dispose();
		dragSourceImage = null;
	}

	/**
	 * This implementation of dragStart will create a default
	 * image that will be used during the drag. The image should be disposed
	 * when the drag is completed in the TreeDragSourceEffect.dragFinished
	 * method.
	 *
	 * Subclasses that override this method should call super.dragStart(event)
	 * to use the image from the default implementation.
	 *
	 * @param event the information associated with the drag start event
	 */
	@Override
	public void dragStart(DragSourceEvent event) {
		event.image = getDragSourceImage(event);
	}

	Image getDragSourceImage(DragSourceEvent event) {
		if (dragSourceImage != null) dragSourceImage.dispose();
		dragSourceImage = null;
		NSPoint point = new NSPoint();
		long /*int*/ ptr = OS.malloc(NSPoint.sizeof);
		OS.memmove(ptr, point, NSPoint.sizeof);
		NSEvent nsEvent = NSApplication.sharedApplication().currentEvent();
		NSTableView widget = (NSTableView)control.view;
		NSImage nsImage = widget.dragImageForRowsWithIndexes(widget.selectedRowIndexes(), widget.tableColumns(), nsEvent, ptr);
		OS.memmove(point, ptr, NSPoint.sizeof);
		OS.free(ptr);
		//TODO: Image representation wrong???
		Image image = Image.cocoa_new(control.getDisplay(), SWT.BITMAP, nsImage);
		dragSourceImage = image;
		nsImage.retain();
		event.offsetX = (int)point.x;
		event.offsetY = (int)point.y;
		return image;
	}
}