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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, 2009 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.widgets;

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

/**
 * Instances of this class represent a selectable user interface object
 * that represents a expandable item in a expand bar.
 * 
 * 

 * Styles:
 * (none)
 * Events:
 * (none)
 * 
 * 

 * IMPORTANT: This class is not intended to be subclassed.
 * 
 *
 * @see ExpandBar
 * @see Sample code and further information
 *
 * @since 3.2
 * @noextend This class is not intended to be subclassed by clients.
 */
public class ExpandItem extends Item {
	ExpandBar parent;
	Control control;
	boolean expanded;
	int x, y, width, height;
	int imageHeight, imageWidth;
	static final int TEXT_INSET = 6;
	static final int BORDER = 1;
	static final int CHEVRON_SIZE = 24;

/**
 * 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 composite control which will be the parent of the new instance (cannot be null)
 * @param style the style of control 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
 *    ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass
 * 
 *
 * @see Widget#checkSubclass
 * @see Widget#getStyle
 */
public ExpandItem (ExpandBar parent, int style) {
	this (parent, style, checkNull (parent).getItemCount ());
}

/**
 * Constructs a new instance of this class given its parent, a
 * style value describing its behavior and appearance, and the index
 * at which to place it in the items maintained by its parent.
 * 
 * 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 composite control which will be the parent of the new instance (cannot be null)
 * @param style the style of control to construct
 * @param index the zero-relative index to store the receiver in its parent
 *
 * @exception IllegalArgumentException 
 *    ERROR_NULL_ARGUMENT - if the parent is null
 *    ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the parent (inclusive)
 * 
 * @exception SWTException 
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent
 *    ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass
 * 
 *
 * @see Widget#checkSubclass
 * @see Widget#getStyle
 */
public ExpandItem (ExpandBar parent, int style, int index) {
	super (parent, style);
	this.parent = parent;
	parent.createItem (this, style, index);
}

static ExpandBar checkNull (ExpandBar control) {
	if (control == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
	return control;
}

@Override
public void dispose () {
	if (isDisposed ()) return;
	//if (!isValidThread ()) error (SWT.ERROR_THREAD_INVALID_ACCESS);
	parent.destroyItem (this);
	super.dispose();
	parent = null;
	control = null;
}

void drawChevron (GC gc, int x, int y) {
	int [] polyline1, polyline2;
	if (expanded) {
		int px = x + 4 + 5;
		int py = y + 4 + 7;
		polyline1 = new int [] {
				px,py, px+1,py, px+1,py-1, px+2,py-1, px+2,py-2, px+3,py-2, px+3,py-3,
				px+3,py-2, px+4,py-2, px+4,py-1, px+5,py-1, px+5,py, px+6,py};
		py += 4;
		polyline2 = new int [] {
				px,py, px+1,py, px+1,py-1, px+2,py-1, px+2,py-2, px+3,py-2, px+3,py-3,
				px+3,py-2, px+4,py-2, px+4,py-1,  px+5,py-1, px+5,py, px+6,py};
	} else {
		int px = x + 4 + 5;
		int py = y + 4 + 4;
		polyline1 = new int[] {
				px,py, px+1,py, px+1,py+1, px+2,py+1, px+2,py+2, px+3,py+2, px+3,py+3,
				px+3,py+2, px+4,py+2, px+4,py+1,  px+5,py+1, px+5,py, px+6,py};
		py += 4;
		polyline2 = new int [] {
				px,py, px+1,py, px+1,py+1, px+2,py+1, px+2,py+2, px+3,py+2, px+3,py+3,
				px+3,py+2, px+4,py+2, px+4,py+1,  px+5,py+1, px+5,py, px+6,py};
	}
	gc.setForeground (display.getSystemColor (SWT.COLOR_TITLE_FOREGROUND));
	gc.drawPolyline (polyline1);
	gc.drawPolyline (polyline2);
}

void drawItem (GC gc, boolean drawFocus) {
	int headerHeight = parent.getBandHeight ();
	Display display = getDisplay ();
	gc.setForeground (display.getSystemColor (SWT.COLOR_TITLE_BACKGROUND));
	gc.setBackground (display.getSystemColor (SWT.COLOR_TITLE_BACKGROUND_GRADIENT));
	gc.fillGradientRectangle (x, y, width, headerHeight, true);
	if (expanded) {
		gc.setForeground (display.getSystemColor (SWT.COLOR_TITLE_BACKGROUND_GRADIENT));
		gc.drawLine (x, y + headerHeight, x, y + headerHeight + height - 1);
		gc.drawLine (x, y + headerHeight + height - 1, x + width - 1, y + headerHeight + height - 1);
		gc.drawLine (x + width - 1, y + headerHeight + height - 1, x + width - 1, y + headerHeight);
	}
	int drawX = x;
	if (image != null) {
		drawX += ExpandItem.TEXT_INSET;
		if (imageHeight > headerHeight) {
			gc.drawImage (image, drawX, y + headerHeight - imageHeight);
		} else {
			gc.drawImage (image, drawX, y + (headerHeight - imageHeight) / 2);
		}
		drawX += imageWidth;
	}
	if (text.length() > 0) {
		drawX += ExpandItem.TEXT_INSET;
		Point size = gc.stringExtent (text);
		gc.setForeground (parent.getForeground ());
		gc.drawString (text, drawX, y + (headerHeight - size.y) / 2, true);
	}
	int chevronSize = ExpandItem.CHEVRON_SIZE;
	drawChevron (gc, x + width - chevronSize, y + (headerHeight - chevronSize) / 2);
	if (drawFocus) {
		gc.drawFocus (x + 1, y + 1, width - 2, headerHeight - 2);
	}
}

/**
 * Returns the control that is shown when the item is expanded.
 * If no control has been set, return null.
 *
 * @return the control
 *
 * @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 Control getControl() {
	checkWidget ();
	return control;
}

/**
 * Returns true if the receiver is expanded,
 * and false otherwise.
 *
 * @return the expanded state
 *
 * @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 boolean getExpanded() {
	checkWidget ();
	return expanded;
}

/**
 * Returns the height of the receiver's header
 *
 * @return the height of the header
 *
 * @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 getHeaderHeight () {
	checkWidget ();
	return Math.max (parent.getBandHeight (), imageHeight);
}

/**
 * Gets the height of the receiver.
 *
 * @return the height
 *
 * @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 getHeight () {
	checkWidget ();
	return height;
}

/**
 * Returns the receiver's parent, which must be a ExpandBar.
 *
 * @return the receiver's parent
 *
 * @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 ExpandBar getParent () {
	checkWidget ();
	return parent;
}

int getPreferredWidth (GC gc) {
	int width = ExpandItem.TEXT_INSET * 2 + ExpandItem.CHEVRON_SIZE;
	if (image != null) {
		width += ExpandItem.TEXT_INSET + imageWidth;
	}
	if (text.length() > 0) {
		width += gc.stringExtent (text).x;
	}
	return width;
}

void redraw () {
	int headerHeight = parent.getBandHeight ();
	if (imageHeight > headerHeight) {
		parent.redraw (x + ExpandItem.TEXT_INSET, y + headerHeight - imageHeight, imageWidth, imageHeight, false);
	}
	parent.redraw (x, y, width, headerHeight + height, false);
}

void setBounds (int x, int y, int width, int height, boolean move, boolean size) {
	redraw ();
	int headerHeight = parent.getBandHeight ();
	if (move) {
		if (imageHeight > headerHeight) {
			y += (imageHeight - headerHeight);
		}
		this.x = x;
		this.y = y;
		redraw ();
	}
	if (size) {
		this.width = width;
		this.height = height;
		redraw ();
	}
	if (control != null && !control.isDisposed ()) {
		if (move) control.setLocation (x + BORDER, y + headerHeight);
		if (size) control.setSize (Math.max (0, width - 2 * BORDER), Math.max (0, height - BORDER));
	}
}

/**
 * Sets the control that is shown when the item is expanded.
 *
 * @param control the new control (or null)
 *
 * @exception IllegalArgumentException 
 *    ERROR_INVALID_ARGUMENT - if the control has been disposed
 *    ERROR_INVALID_PARENT - if the control is not in the same widget tree
 * 
 * @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 setControl(Control control) {
	checkWidget ();
	if (control != null) {
		if (control.isDisposed ()) error (SWT.ERROR_INVALID_ARGUMENT);
		if (control.parent != parent) error (SWT.ERROR_INVALID_PARENT);
	}
	this.control = control;
	if (control != null) {
		control.setVisible (expanded);
		int headerHeight = parent.getBandHeight ();
		control.setBounds (x + BORDER, y + headerHeight, Math.max (0, width - 2 * BORDER), Math.max (0, height - BORDER));
	}
}

/**
 * Sets the expanded state of the receiver.
 *
 * @param expanded the new expanded state
 *
 * @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 setExpanded (boolean expanded) {
	checkWidget ();
	this.expanded = expanded;
	parent.showItem (this);
}

@Override
public void setImage (Image image) {
	super.setImage (image);
	int oldImageHeight = imageHeight;
	if (image != null) {
		Rectangle bounds = image.getBounds ();
		imageHeight = bounds.height;
		imageWidth = bounds.width;
	} else {
		imageHeight = imageWidth = 0;
	}
	if (oldImageHeight != imageHeight) {
		parent.layoutItems (parent.indexOf (this), true);
	} else {
		redraw ();
	}
}

/**
 * Sets the height of the receiver. This is height of the item when it is expanded,
 * excluding the height of the header.
 *
 * @param height the new height
 *
 * @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 setHeight (int height) {
	checkWidget ();
	if (height < 0) return;
	setBounds (0, 0, width, height, false, true);
	if (expanded) parent.layoutItems (parent.indexOf (this) + 1, true);
}

@Override
public void setText (String string) {
	super.setText (string);
	redraw ();
}
}