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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.widgets;

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

/**
 * Instances of this class support the layout of selectable
 * expand bar items.
 * 
 * The item children that may be added to instances of this class
 * must be of type ExpandItem.
 * 

 * 

 * Styles:
 * V_SCROLL
 * Events:
 * Expand, Collapse
 * 
 * 

 * IMPORTANT: This class is not intended to be subclassed.
 * 
 *
 * @see ExpandItem
 * @see ExpandEvent
 * @see ExpandListener
 * @see ExpandAdapter
 * @see ExpandBar snippets
 * @see SWT Example: ControlExample
 * @see Sample code and further information
 *
 * @since 3.2
 * @noextend This class is not intended to be subclassed by clients.
 */
public class ExpandBar extends Composite {
	ExpandItem [] items;
	int itemCount;
	ExpandItem focusItem;
	int spacing;
	int yCurrentScroll;
	Font font;
	Color foreground;
	Listener listener;
	boolean inDispose;

/**
 * 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 SWT#V_SCROLL
 * @see Widget#checkSubclass
 * @see Widget#getStyle
 */
public ExpandBar (Composite parent, int style) {
	super (parent, checkStyle (style));
	items = new ExpandItem [4];

	listener = new Listener () {
		@Override
		public void handleEvent (Event event) {
			switch (event.type) {
				case SWT.Dispose:		onDispose (event);        	break;
				case SWT.MouseDown:		onMouseDown (event);   		break;
				case SWT.MouseUp:		onMouseUp (event);   		break;
				case SWT.Paint:			onPaint (event);     		break;
				case SWT.Resize:		onResize ();     			break;
				case SWT.KeyDown:		onKeyDown (event);    		break;
				case SWT.FocusIn:		onFocus ();     			break;
				case SWT.FocusOut:		onFocus ();     			break;
				case SWT.Traverse:		onTraverse (event);   		break;
			}
		}
	};
	addListener (SWT.Dispose, listener);
	addListener (SWT.MouseDown, listener);
	addListener (SWT.MouseUp, listener);
	addListener (SWT.Paint, listener);
	addListener (SWT.Resize, listener);
	addListener (SWT.KeyDown, listener);
	addListener (SWT.FocusIn, listener);
	addListener (SWT.FocusOut, listener);
	addListener (SWT.Traverse, listener);

	ScrollBar verticalBar = getVerticalBar ();
	if (verticalBar != null) {
		verticalBar.addListener (SWT.Selection, new Listener () {
			@Override
			public void handleEvent (Event event) {
				onScroll (event);
			}
		});
	}
}

/**
 * Adds the listener to the collection of listeners who will
 * be notified when an item in the receiver is expanded or collapsed
 * by sending it one of the messages defined in the ExpandListener
 * interface.
 *
 * @param listener the listener which should be notified
 *
 * @exception IllegalArgumentException 
 *    ERROR_NULL_ARGUMENT - if the listener is 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
 * 
 *
 * @see ExpandListener
 * @see #removeExpandListener
 */
public void addExpandListener (ExpandListener listener) {
	checkWidget ();
	if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
	TypedListener typedListener = new TypedListener (listener);
	addListener (SWT.Expand, typedListener);
	addListener (SWT.Collapse, typedListener);
}

static int checkStyle (int style) {
	return style & ~SWT.H_SCROLL;
}

@Override
protected void checkSubclass () {
	if (!isValidSubclass ()) error (SWT.ERROR_INVALID_SUBCLASS);
}

@Override
public Point computeSize (int wHint, int hHint, boolean changed) {
	checkWidget ();
	int height = 0, width = 0;
	if (wHint == SWT.DEFAULT || hHint == SWT.DEFAULT) {
		if (itemCount > 0) {
			height += spacing;
			GC gc = new GC (this);
			for (int i = 0; i < itemCount; i++) {
				ExpandItem item = items [i];
				height += item.getHeaderHeight ();
				if (item.expanded) height += item.height;
				height += spacing;
				width = Math.max (width, item.getPreferredWidth (gc));
			}
			gc.dispose ();
		}
	}
	if (width == 0) width = DEFAULT_WIDTH;
	if (height == 0) height = DEFAULT_HEIGHT;
	if (wHint != SWT.DEFAULT) width = wHint;
	if (hHint != SWT.DEFAULT) height = hHint;
	Rectangle trim = computeTrim (0, 0, width, height);
	return new Point (trim.width, trim.height);
}

void createItem (ExpandItem item, int style, int index) {
	if (!(0 <= index && index <= itemCount)) error (SWT.ERROR_INVALID_RANGE);
	if (itemCount == items.length) {
		ExpandItem [] newItems = new ExpandItem [itemCount + 4];
		System.arraycopy (items, 0, newItems, 0, items.length);
		items = newItems;
	}
	System.arraycopy (items, index, items, index + 1, itemCount - index);
	items [index] = item;
	itemCount++;
	if (focusItem == null) focusItem = item;
	item.width = Math.max (0, getClientArea ().width - spacing * 2);
	layoutItems (index, true);
}

void destroyItem (ExpandItem item) {
	if (inDispose) return;
	int index = 0;
	while (index < itemCount) {
		if (items [index] == item) break;
		index++;
	}
	if (index == itemCount) return;
	if (item == focusItem) {
		int focusIndex = index > 0 ? index - 1 : 1;
		if (focusIndex < itemCount) {
			focusItem = items [focusIndex];
			focusItem.redraw ();
		} else {
			focusItem = null;
		}
	}
	System.arraycopy (items, index + 1, items, index, --itemCount - index);
	items [itemCount] = null;
	item.redraw ();
	layoutItems (index, true);
}

int getBandHeight () {
	if (font == null) return ExpandItem.CHEVRON_SIZE;
	GC gc = new GC (this);
	FontMetrics metrics = gc.getFontMetrics ();
	gc.dispose ();
	return Math.max (ExpandItem.CHEVRON_SIZE, metrics.getHeight ());
}

@Override
public Color getForeground () {
	checkWidget ();
	if (foreground == null) {
		Display display = getDisplay ();
		return display.getSystemColor (SWT.COLOR_TITLE_FOREGROUND);
	}
	return foreground;
}

/**
 * Returns the item at the given, zero-relative index in the
 * receiver. Throws an exception if the index is out of range.
 *
 * @param index the index of the item to return
 * @return the item at the given index
 *
 * @exception IllegalArgumentException 
 *    ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)
 * 
 * @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 ExpandItem getItem (int index) {
	checkWidget ();
	if (!(0 <= index && index < itemCount)) error (SWT.ERROR_INVALID_RANGE);
	return items [index];
}

/**
 * Returns the number of items contained in the receiver.
 *
 * @return the number of items
 *
 * @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 getItemCount () {
	checkWidget ();
	return itemCount;
}

/**
 * Returns an array of ExpandItems which are the items
 * in the receiver.
 * 
 * Note: This is not the actual structure used by the receiver
 * to maintain its list of items, so modifying the array will
 * not affect the receiver.
 * 
 *
 * @return the items in the receiver
 *
 * @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 ExpandItem [] getItems () {
	checkWidget ();
	ExpandItem [] result = new ExpandItem [itemCount];
	System.arraycopy (items, 0, result, 0, itemCount);
	return result;
}

/**
 * Returns the receiver's spacing.
 *
 * @return the spacing
 *
 * @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 getSpacing () {
	checkWidget ();
	return spacing;
}

/**
 * Searches the receiver's list starting at the first item
 * (index 0) until an item is found that is equal to the
 * argument, and returns the index of that item. If no item
 * is found, returns -1.
 *
 * @param item the search item
 * @return the index of the item
 *
 * @exception IllegalArgumentException 
 *    ERROR_NULL_ARGUMENT - if the item is null
 *    ERROR_INVALID_ARGUMENT - if the item has been disposed
 * 
 * @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 indexOf (ExpandItem item) {
	checkWidget ();
	if (item == null) error (SWT.ERROR_NULL_ARGUMENT);
	for (int i = 0; i < itemCount; i++) {
		if (items [i] == item) return i;
	}
	return -1;
}

void layoutItems (int index, boolean setScrollbar) {
	if (index < itemCount) {
		int y = spacing - yCurrentScroll;
		for (int i = 0; i < index; i++) {
			ExpandItem item = items [i];
			if (item.expanded) y += item.height;
			y += item.getHeaderHeight() + spacing;
		}
		for (int i = index; i < itemCount; i++) {
			ExpandItem item = items [i];
			item.setBounds (spacing, y, 0, 0, true, false);
			if (item.expanded) y += item.height;
			y += item.getHeaderHeight() + spacing;
		}
	}
	if (setScrollbar) setScrollbar ();
}

/**
 * Removes the listener from the collection of listeners who will
 * be notified when items in the receiver are expanded or collapsed.
 *
 * @param listener the listener which should no longer be notified
 *
 * @exception IllegalArgumentException 
 *    ERROR_NULL_ARGUMENT - if the listener is 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
 * 
 *
 * @see ExpandListener
 * @see #addExpandListener
 */
public void removeExpandListener (ExpandListener listener) {
	checkWidget ();
	if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
	if (eventTable == null) return;
	eventTable.unhook (SWT.Expand, listener);
	eventTable.unhook (SWT.Collapse, listener);
}

@Override
void reskinChildren (int flags) {
	if (items != null) {
		for (int i=0; i 0 && height > maxHeight) {
		yCurrentScroll = Math.max (0, yCurrentScroll + maxHeight - height);
		layoutItems (0, false);
	}
	maxHeight += yCurrentScroll;

	int selection = Math.min (yCurrentScroll, maxHeight);
	int increment = verticalBar.getIncrement ();
	int pageIncrement = verticalBar.getPageIncrement ();
	verticalBar.setValues(selection, 0, maxHeight, height, increment, pageIncrement);
	verticalBar.setVisible(maxHeight > height);
}

/**
 * Sets the receiver's spacing. Spacing specifies the number of pixels allocated around
 * each item.
 *
 * @param spacing the spacing around each item
 *
 * @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 setSpacing (int spacing) {
	checkWidget ();
	if (spacing < 0) return;
	if (spacing == this.spacing) return;
	this.spacing = spacing;
	int width = Math.max (0, getClientArea ().width - spacing * 2);
	for (int i = 0; i < itemCount; i++) {
		ExpandItem item = items[i];
		if (item.width != width) item.setBounds (0, 0, width, item.height, false, true);
	}
	layoutItems (0, true);
	redraw ();
}

void showItem (ExpandItem item) {
	Control control = item.control;
	if (control != null && !control.isDisposed ()) {
		control.setVisible (item.expanded);
	}
	item.redraw ();
	int index = indexOf (item);
	layoutItems (index + 1, true);
}

void onDispose (Event event) {
	removeListener (SWT.Dispose, listener);
	notifyListeners (SWT.Dispose, event);
	event.type = SWT.None;
	/*
	 * Usually when an item is disposed, destroyItem will change the size of the items array,
	 * reset the bounds of all the tabs and manage the widget associated with the tab.
	 * Since the whole folder is being disposed, this is not necessary.  For speed
	 * the inDispose flag is used to skip over this part of the item dispose.
	 */
	inDispose = true;

	for (int i = 0; i < itemCount; i++) {
		items [i].dispose ();
	}
	items = null;
	font = null;
	foreground = null;
	focusItem = null;
}

void onFocus () {
	if (focusItem != null) focusItem.redraw ();
}

void onKeyDown (Event event) {
	if (focusItem == null) return;
	switch (event.keyCode) {
		case 13: /* Return */
		case 32: /* Space */
			Event ev = new Event ();
			ev.item = focusItem;
			sendEvent (focusItem.expanded ? SWT.Collapse :SWT.Expand, ev);
			focusItem.expanded = !focusItem.expanded;
			showItem (focusItem);
			break;
		case SWT.ARROW_UP: {
			int focusIndex = indexOf (focusItem);
			if (focusIndex > 0) {
				focusItem.redraw ();
				focusItem = items [focusIndex - 1];
				focusItem.redraw ();
			}
			break;
		}
		case SWT.ARROW_DOWN: {
			int focusIndex = indexOf (focusItem);
			if (focusIndex < itemCount - 1) {
				focusItem.redraw ();
				focusItem = items [focusIndex + 1];
				focusItem.redraw ();
			}
			break;
		}
	}
}

void onMouseDown (Event event) {
	if (event.button != 1) return;
	int x = event.x;
	int y = event.y;
	for (int i = 0; i < itemCount; i++) {
		ExpandItem item = items[i];
		boolean hover = item.x <= x && x < (item.x + item.width) && item.y <= y && y < (item.y + getBandHeight ());
		if (hover && item != focusItem) {
			focusItem.redraw ();
			focusItem = item;
			focusItem.redraw ();
			forceFocus ();
			break;
		}
	}
}

void onMouseUp (Event event) {
	if (event.button != 1) return;
	if (focusItem == null) return;
	int x = event.x;
	int y = event.y;
	boolean hover = focusItem.x <= x && x < (focusItem.x + focusItem.width) && focusItem.y <= y && y < (focusItem.y + getBandHeight ());
	if (hover) {
		Event ev = new Event ();
		ev.item = focusItem;
		notifyListeners (focusItem.expanded ? SWT.Collapse : SWT.Expand, ev);
		focusItem.expanded = !focusItem.expanded;
		showItem (focusItem);
	}
}

void onPaint (Event event) {
	boolean hasFocus = isFocusControl ();
	for (int i = 0; i < itemCount; i++) {
		ExpandItem item = items [i];
		item.drawItem (event.gc, hasFocus && item == focusItem);
	}
}

void onResize () {
	Rectangle rect = getClientArea ();
	int width = Math.max (0, rect.width - spacing * 2);
	for (int i = 0; i < itemCount; i++) {
		ExpandItem item = items[i];
		item.setBounds (0, 0, width, item.height, false, true);
	}
	setScrollbar ();
}

void onScroll (Event event) {
	ScrollBar verticalBar = getVerticalBar ();
	if (verticalBar != null) {
		yCurrentScroll = verticalBar.getSelection();
		layoutItems (0, false);
	}
}

void onTraverse (Event event) {
	switch (event.detail) {
		case SWT.TRAVERSE_TAB_NEXT:
		case SWT.TRAVERSE_TAB_PREVIOUS:
			event.doit = true;
			break;
	}
}

}