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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) 2000, 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.custom;

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

/**
 * This class provides the layout for CTabFolder
 *
 * @see CTabFolder
 */
class CTabFolderLayout extends Layout {
@Override
protected Point computeSize(Composite composite, int wHint, int hHint, boolean flushCache) {
	CTabFolder folder = (CTabFolder)composite;
	CTabItem[] items = folder.items;
	CTabFolderRenderer renderer = folder.renderer;
	// preferred width of tab area to show all tabs
	int tabW = 0;
	int selectedIndex = folder.selectedIndex;
	if (selectedIndex == -1) selectedIndex = 0;
	GC gc = new GC(folder);
	for (int i = 0; i < items.length; i++) {
		if (folder.single) {
			tabW = Math.max(tabW, renderer.computeSize(i, SWT.SELECTED, gc, SWT.DEFAULT, SWT.DEFAULT).x);
		} else {
			int state = 0;
			if (i == selectedIndex) state |= SWT.SELECTED;
			tabW += renderer.computeSize(i, state, gc, SWT.DEFAULT, SWT.DEFAULT).x;
		}
	}

	int width = 0, wrapHeight = 0;
	boolean leftControl = false, rightControl = false;
	if (wHint == SWT.DEFAULT) {
		for (int i = 0; i < folder.controls.length; i++) {
			Control control = folder.controls[i];
			if (!control.isDisposed() && control.getVisible()) {
				if ((folder.controlAlignments[i] & SWT.LEAD) != 0) {
					leftControl = true;
				} else {
					rightControl = true;
				}
				width += control.computeSize(SWT.DEFAULT, SWT.DEFAULT).x;
			}
		}
	} else {
		Point size = new Point (wHint, hHint);
		boolean[][] positions = new boolean[1][];
		Rectangle[] rects = folder.computeControlBounds(size, positions);
		int minY = Integer.MAX_VALUE, maxY = 0;
		for (int i = 0; i < rects.length; i++) {
			if (positions[0][i]) {
				minY = Math.min(minY, rects[i].y);
				maxY = Math.max(maxY, rects[i].y + rects[i].height);
				wrapHeight = maxY - minY;
			} else {
				if ((folder.controlAlignments[i] & SWT.LEAD) != 0) {
					leftControl = true;
				} else {
					rightControl = true;
				}
				width += rects[i].width;
			}
		}
	}
	if (leftControl) width += CTabFolder.SPACING * 2;
	if (rightControl) width += CTabFolder.SPACING * 2;
	tabW += width;

	gc.dispose();

	int controlW = 0;
	int controlH = 0;
	// preferred size of controls in tab items
	for (int i = 0; i < items.length; i++) {
		Control control = items[i].control;
		if (control != null && !control.isDisposed()){
			Point size = control.computeSize (wHint, hHint, flushCache);
			controlW = Math.max (controlW, size.x);
			controlH = Math.max (controlH, size.y);
		}
	}

	int minWidth = Math.max(tabW, controlW + folder.marginWidth);
	int minHeight = (folder.minimized) ? 0 : controlH + wrapHeight;
	if (minWidth == 0) minWidth = CTabFolder.DEFAULT_WIDTH;
	if (minHeight == 0) minHeight = CTabFolder.DEFAULT_HEIGHT;

	if (wHint != SWT.DEFAULT) minWidth  = wHint;
	if (hHint != SWT.DEFAULT) minHeight = hHint;

	return new Point (minWidth, minHeight);
}
@Override
protected boolean flushCache(Control control) {
	return true;
}
@Override
protected void layout(Composite composite, boolean flushCache) {
	CTabFolder folder = (CTabFolder)composite;
	// resize content
	if (folder.selectedIndex != -1) {
		Control control = folder.items[folder.selectedIndex].control;
		if (control != null && !control.isDisposed()) {
			control.setBounds(folder.getClientArea());
		}
	}
}
}