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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, 2016 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.widgets.*;
import org.eclipse.swt.graphics.*;

/**
 * The SashForm is a composite control that lays out its children in a
 * row or column arrangement (as specified by the orientation) and places
 * a Sash between each child. One child may be maximized to occupy the
 * entire size of the SashForm.  The relative sizes of the children may
 * be specified using weights.
 * 
 * 

 * Styles:
 * HORIZONTAL, VERTICAL, SMOOTH
 * 
 * 
 *
 * @see SashForm snippets
 * @see SWT Example: CustomControlExample
 * @see Sample code and further information
 */
public class SashForm extends Composite {

	/**
	* The width of all sashes in the form.
	*/
	public int SASH_WIDTH = 3;

	int sashStyle;
	Sash[] sashes = new Sash[0];
	// Remember background and foreground
	// colors to determine whether to set
	// sashes to the default color (null) or
	// a specific color
	Color background = null;
	Color foreground = null;
	Control[] controls = new Control[0];
	Control maxControl = null;
	Listener sashListener;
	static final int DRAG_MINIMUM = 20;

/**
 * Constructs a new instance of this class given its parent
 * and a style value describing its behavior and appearance.
 * 
 * The style value is either one of the style constants defined in
 * class SWT which is applicable to instances of this
 * class, or must be built by bitwise OR'ing together
 * (that is, using the int "|" operator) two or more
 * of those SWT style constants. The class description
 * lists the style constants that are applicable to the class.
 * Style bits are also inherited from superclasses.
 * 
 *
 * @param parent a widget which will be the parent of the new instance (cannot be null)
 * @param style the style of widget to construct
 *
 * @exception IllegalArgumentException 
 *    ERROR_NULL_ARGUMENT - if the parent is null
 * 
 * @exception SWTException 
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent
 * 
 *
 * @see SWT#HORIZONTAL
 * @see SWT#VERTICAL
 * @see #getStyle()
 */
public SashForm(Composite parent, int style) {
	super(parent, checkStyle(style));
	super.setLayout(new SashFormLayout());
	sashStyle = ((style & SWT.VERTICAL) != 0) ? SWT.HORIZONTAL : SWT.VERTICAL;
	if ((style & SWT.BORDER) != 0) sashStyle |= SWT.BORDER;
	if ((style & SWT.SMOOTH) != 0) sashStyle |= SWT.SMOOTH;
	sashListener = new Listener() {
		@Override
		public void handleEvent(Event e) {
			onDragSash(e);
		}
	};
}
static int checkStyle (int style) {
	int mask = SWT.BORDER | SWT.LEFT_TO_RIGHT | SWT.RIGHT_TO_LEFT;
	return style & mask;
}
Sash createSash() {
	Sash sash = new Sash(this, sashStyle);
	sash.setBackground(background);
	sash.setForeground(foreground);
	sash.setToolTipText(getToolTipText());
	sash.addListener(SWT.Selection, sashListener);
	return sash;
}
/**
 * Returns SWT.HORIZONTAL if the controls in the SashForm are laid out side by side
 * or SWT.VERTICAL   if the controls in the SashForm are laid out top to bottom.
 *
 * 
 * To retrieve the bidi orientation of the SashForm use {@link #getStyle()}
 * and test if the SWT.RIGHT_TO_LEFT or SWT.LEFT_TO_RIGHT bits are set.
 * 
 *
 * @return SWT.HORIZONTAL or SWT.VERTICAL
 */
@Override
public int getOrientation() {
	//checkWidget();
	return (sashStyle & SWT.VERTICAL) != 0 ? SWT.HORIZONTAL : SWT.VERTICAL;
}
/**
 * Returns the width of the sashes when the controls in the SashForm are
 * laid out.
 *
 * @return the width of the sashes
 *
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 *
 * @since 3.4
 */
public int getSashWidth() {
	checkWidget();
	return SASH_WIDTH;
}
@Override
public int getStyle() {
	int style = super.getStyle();
	style |= getOrientation() == SWT.VERTICAL ? SWT.VERTICAL : SWT.HORIZONTAL;
	if ((sashStyle & SWT.SMOOTH) != 0) style |= SWT.SMOOTH;
	return style;
}
/**
 * Answer the control that currently is maximized in the SashForm.
 * This value may be null.
 *
 * @return the control that currently is maximized or null
 */
public Control getMaximizedControl(){
	//checkWidget();
	return this.maxControl;
}
/**
 * Answer the relative weight of each child in the SashForm.  The weight represents the
 * percent of the total width (if SashForm has Horizontal orientation) or
 * total height (if SashForm has Vertical orientation) each control occupies.
 * The weights are returned in order of the creation of the widgets (weight[0]
 * corresponds to the weight of the first child created).
 *
 * @return the relative weight of each child
 *
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 */

public int[] getWeights() {
	checkWidget();
	Control[] cArray = getControls(false);
	int[] ratios = new int[cArray.length];
	for (int i = 0; i < cArray.length; i++) {
		Object data = cArray[i].getLayoutData();
		if (data != null && data instanceof SashFormData) {
			ratios[i] = (int)(((SashFormData)data).weight * 1000 >> 16);
		} else {
			ratios[i] = 200;
		}
	}
	return ratios;
}
Control[] getControls(boolean onlyVisible) {
	Control[] children = getChildren();
	Control[] result = new Control[0];
	for (int i = 0; i < children.length; i++) {
		if (children[i] instanceof Sash) continue;
		if (onlyVisible && !children[i].getVisible()) continue;

		Control[] newResult = new Control[result.length + 1];
		System.arraycopy(result, 0, newResult, 0, result.length);
		newResult[result.length] = children[i];
		result = newResult;
	}
	return result;
}
void onDragSash(Event event) {
	Sash sash = (Sash)event.widget;
	int sashIndex = -1;
	for (int i= 0; i < sashes.length; i++) {
		if (sashes[i] == sash) {
			sashIndex = i;
			break;
		}
	}
	if (sashIndex == -1) return;

	Control c1 = controls[sashIndex];
	Control c2 = controls[sashIndex + 1];
	Rectangle b1 = c1.getBounds();
	Rectangle b2 = c2.getBounds();

	Rectangle sashBounds = sash.getBounds();
	Rectangle area = getClientArea();
	boolean correction = false;
	if (getOrientation() == SWT.HORIZONTAL) {
		correction = b1.width < DRAG_MINIMUM || b2.width < DRAG_MINIMUM;
		int totalWidth = b2.x + b2.width - b1.x;
		int shift = event.x - sashBounds.x;
		b1.width += shift;
		b2.x += shift;
		b2.width -= shift;
		if (b1.width < DRAG_MINIMUM) {
			b1.width = DRAG_MINIMUM;
			b2.x = b1.x + b1.width + sashBounds.width;
			b2.width = totalWidth - b2.x;
			event.x = b1.x + b1.width;
			event.doit = false;
		}
		if (b2.width < DRAG_MINIMUM) {
			b1.width = totalWidth - DRAG_MINIMUM - sashBounds.width;
			b2.x = b1.x + b1.width + sashBounds.width;
			b2.width = DRAG_MINIMUM;
			event.x = b1.x + b1.width;
			event.doit = false;
		}
		Object data1 = c1.getLayoutData();
		if (data1 == null || !(data1 instanceof SashFormData)) {
			data1 = new SashFormData();
			c1.setLayoutData(data1);
		}
		Object data2 = c2.getLayoutData();
		if (data2 == null || !(data2 instanceof SashFormData)) {
			data2 = new SashFormData();
			c2.setLayoutData(data2);
		}
		((SashFormData)data1).weight = (((long)b1.width << 16) + area.width - 1) / area.width;
		((SashFormData)data2).weight = (((long)b2.width << 16) + area.width - 1) / area.width;
	} else {
		correction = b1.height < DRAG_MINIMUM || b2.height < DRAG_MINIMUM;
		int totalHeight = b2.y + b2.height - b1.y;
		int shift = event.y - sashBounds.y;
		b1.height += shift;
		b2.y += shift;
		b2.height -= shift;
		if (b1.height < DRAG_MINIMUM) {
			b1.height = DRAG_MINIMUM;
			b2.y = b1.y + b1.height + sashBounds.height;
			b2.height = totalHeight - b2.y;
			event.y = b1.y + b1.height;
			event.doit = false;
		}
		if (b2.height < DRAG_MINIMUM) {
			b1.height = totalHeight - DRAG_MINIMUM - sashBounds.height;
			b2.y = b1.y + b1.height + sashBounds.height;
			b2.height = DRAG_MINIMUM;
			event.y = b1.y + b1.height;
			event.doit = false;
		}
		Object data1 = c1.getLayoutData();
		if (data1 == null || !(data1 instanceof SashFormData)) {
			data1 = new SashFormData();
			c1.setLayoutData(data1);
		}
		Object data2 = c2.getLayoutData();
		if (data2 == null || !(data2 instanceof SashFormData)) {
			data2 = new SashFormData();
			c2.setLayoutData(data2);
		}
		((SashFormData)data1).weight = (((long)b1.height << 16) + area.height - 1) / area.height;
		((SashFormData)data2).weight = (((long)b2.height << 16) + area.height - 1) / area.height;
	}
	if (correction || (event.doit && event.detail != SWT.DRAG)) {
		c1.setBounds(b1);
		sash.setBounds(event.x, event.y, event.width, event.height);
		c2.setBounds(b2);
	}
}
/**
 * If orientation is SWT.HORIZONTAL, lay the controls in the SashForm
 * out side by side.  If orientation is SWT.VERTICAL, lay the
 * controls in the SashForm out top to bottom.
 *
 * 
 * Since 3.7, this method can also be called with SWT.RIGHT_TO_LEFT or SWT.LEFT_TO_RIGHT
 * to change the bidi orientation of the SashForm.
 * 
 *
 * @param orientation SWT.HORIZONTAL or SWT.VERTICAL, SWT.RIGHT_TO_LEFT or SWT.LEFT_TO_RIGHT
 *
 * @see Control#setOrientation(int)
 *
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 *    ERROR_INVALID_ARGUMENT - if the value of orientation is not SWT.HORIZONTAL or SWT.VERTICAL, SWT.RIGHT_TO_LEFT or SWT.LEFT_TO_RIGHT
 * 
 */
@Override
public void setOrientation(int orientation) {
	checkWidget();
	if (orientation == SWT.RIGHT_TO_LEFT || orientation == SWT.LEFT_TO_RIGHT) {
		super.setOrientation(orientation);
		return;
	}
	if (getOrientation() == orientation) return;
	if (orientation != SWT.HORIZONTAL && orientation != SWT.VERTICAL) {
		SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	}
	sashStyle &= ~(SWT.HORIZONTAL | SWT.VERTICAL);
	sashStyle |= orientation == SWT.VERTICAL ? SWT.HORIZONTAL : SWT.VERTICAL;
	for (int i = 0; i < sashes.length; i++) {
		sashes[i].dispose();
		sashes[i] = createSash();
	}
	layout(false);
}
@Override
public void setBackground (Color color) {
	super.setBackground(color);
	background = color;
	for (int i = 0; i < sashes.length; i++) {
		sashes[i].setBackground(background);
	}
}
@Override
public void setForeground (Color color) {
	super.setForeground(color);
	foreground = color;
	for (int i = 0; i < sashes.length; i++) {
		sashes[i].setForeground(foreground);
	}
}
/**
 * Sets the layout which is associated with the receiver to be
 * the argument which may be null.
 * 
 * Note: No Layout can be set on this Control because it already
 * manages the size and position of its children.
 * 
 *
 * @param layout the receiver's new layout or null
 *
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 */
@Override
public void setLayout (Layout layout) {
	checkWidget();
	return;
}
/**
 * Specify the control that should take up the entire client area of the SashForm.
 * If one control has been maximized, and this method is called with a different control,
 * the previous control will be minimized and the new control will be maximized.
 * If the value of control is null, the SashForm will minimize all controls and return to
 * the default layout where all controls are laid out separated by sashes.
 *
 * @param control the control to be maximized or null
 *
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 */
public void setMaximizedControl(Control control){
	checkWidget();
	if (control == null) {
		if (maxControl != null) {
			this.maxControl = null;
			layout(false);
			for (int i= 0; i < sashes.length; i++){
				sashes[i].setVisible(true);
			}
		}
		return;
	}

	for (int i= 0; i < sashes.length; i++){
		sashes[i].setVisible(false);
	}
	maxControl = control;
	layout(false);
}

/**
 * Specify the width of the sashes when the controls in the SashForm are
 * laid out.
 *
 * @param width the width of the sashes
 *
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 *
 * @since 3.4
 */
public void setSashWidth(int width) {
	checkWidget();
	if (SASH_WIDTH == width) return;
	SASH_WIDTH = width;
	layout(false);
}
@Override
public void setToolTipText(String string) {
	super.setToolTipText(string);
	for (int i = 0; i < sashes.length; i++) {
		sashes[i].setToolTipText(string);
	}
}
/**
 * Specify the relative weight of each child in the SashForm.  This will determine
 * what percent of the total width (if SashForm has Horizontal orientation) or
 * total height (if SashForm has Vertical orientation) each control will occupy.
 * The weights must be positive values and there must be an entry for each
 * non-sash child of the SashForm.
 *
 * @param weights the relative weight of each child
 *
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 *    ERROR_INVALID_ARGUMENT - if the weights value is null or of incorrect length (must match the number of children)
 * 
 */
public void setWeights(int[] weights) {
	checkWidget();
	Control[] cArray = getControls(false);
	if (weights == null || weights.length != cArray.length) {
		SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	}

	int total = 0;
	for (int i = 0; i < weights.length; i++) {
		if (weights[i] < 0) {
			SWT.error(SWT.ERROR_INVALID_ARGUMENT);
		}
		total += weights[i];
	}
	if (total == 0) {
		SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	}
	for (int i = 0; i < cArray.length; i++) {
		Object data = cArray[i].getLayoutData();
		if (data == null || !(data instanceof SashFormData)) {
			data = new SashFormData();
			cArray[i].setLayoutData(data);
		}
		((SashFormData)data).weight = (((long)weights[i] << 16) + total - 1) / total;
	}

	layout(false);
}
}