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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.widgets;


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

/**
 * Instances of this class allow the user to select a font
 * from all available fonts in the system.
 * 
 * Styles:
 * (none)
 * Events:
 * (none)
 * 
 * 
 * IMPORTANT: This class is not intended to be subclassed.
 * 
 *
 * @see SWT Example: ControlExample, Dialog tab
 * @see Sample code and further information
 * @noextend This class is not intended to be subclassed by clients.
 */
public class FontDialog extends Dialog {
	FontData fontData;
	RGB rgb;
	boolean selected;
	int fontID, fontSize;
	boolean effectsVisible = true;

/**
 * Constructs a new instance of this class given only its parent.
 *
 * @param parent a shell which will be the parent of the new instance
 *
 * @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
 * 
 */
public FontDialog (Shell parent) {
	this (parent, SWT.APPLICATION_MODAL);
}

/**
 * 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 shell which will be the parent of the new instance
 * @param style the style of dialog 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
 * 
 */
public FontDialog (Shell parent, int style) {
	super (parent, checkStyle (parent, style));
	checkSubclass ();
}

void changeFont(long /*int*/ id, long /*int*/ sel, long /*int*/ arg0) {
	selected = true;
}

/**
 * Returns true if the dialog's effects selection controls
 * are visible, and false otherwise.
 * 
 * If the platform's font dialog does not have any effects selection controls,
 * then this method always returns false.
 * 
 *
 * @return true if the dialog's effects selection controls
 * are visible and false otherwise
 *
 * @since 3.8
 */
public boolean getEffectsVisible () {
	return effectsVisible;
}

/**
 * Returns a FontData object describing the font that was
 * selected in the dialog, or null if none is available.
 *
 * @return the FontData for the selected font, or null
 * @deprecated use #getFontList ()
 */
@Deprecated
public FontData getFontData () {
	return fontData;
}

/**
 * Returns a FontData set describing the font that was
 * selected in the dialog, or null if none is available.
 *
 * @return the FontData for the selected font, or null
 * @since 2.1.1
 */
public FontData [] getFontList () {
	if (fontData == null) return null;
	FontData [] result = new FontData [1];
	result [0] = fontData;
	return result;
}

/**
 * Returns an RGB describing the color that was selected
 * in the dialog, or null if none is available.
 *
 * @return the RGB value for the selected color, or null
 *
 * @see PaletteData#getRGBs
 *
 * @since 2.1
 */
public RGB getRGB () {
	return rgb;
}

/**
 * Makes the dialog visible and brings it to the front
 * of the display.
 *
 * @return a FontData object describing the font that was selected,
 *         or null if the dialog was cancelled or an error occurred
 *
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the dialog has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the dialog
 * 
 */
public FontData open () {
	Display display = parent != null ? parent.display : Display.getCurrent ();
	NSFontPanel panel = NSFontPanel.sharedFontPanel();
	panel.setTitle(NSString.stringWith(title != null ? title : ""));
	boolean create = fontData != null;
	Font font = create ? new Font(display, fontData) : display.getSystemFont();
	panel.setPanelFont(font.handle, false);
	SWTPanelDelegate delegate = (SWTPanelDelegate)new SWTPanelDelegate().alloc().init();
	long /*int*/ jniRef = OS.NewGlobalRef(this);
	if (jniRef == 0) error(SWT.ERROR_NO_HANDLES);
	OS.object_setInstanceVariable(delegate.id, Display.SWT_OBJECT, jniRef);
	panel.setDelegate(delegate);
	fontData = null;
	selected = false;
	panel.orderFront(null);
	display.setModalDialog(this);
	NSApplication.sharedApplication().runModalForWindow(panel);
	display.setModalDialog(null);
	if (selected) {
		NSFont nsFont = panel.panelConvertFont(font.handle);
		if (nsFont != null) {
			fontData = Font.cocoa_new(display, nsFont).getFontData()[0];
		}
	}
	panel.setDelegate(null);
	delegate.release();
	OS.DeleteGlobalRef(jniRef);
	if (create) font.dispose();
	return fontData;
}

void setColor_forAttribute(long /*int*/ id, long /*int*/ sel, long /*int*/ colorArg, long /*int*/ attribute) {
	if (attribute != 0 && NSString.stringWith("NSColor").isEqualToString(new NSString(attribute))) { //$NON-NLS-1$
		if (colorArg != 0) {
			NSColor color = new NSColor(colorArg);
			Display display = parent != null ? parent.getDisplay() : Display.getCurrent();
			double /*float*/ [] handle = display.getNSColorRGB(color);
			rgb = new RGB((int)(handle[0] * 255), (int)(handle[1] * 255), (int)(handle[2] * 255));
		} else {
			rgb = null;
		}
	}
}

/**
 * Sets the effects selection controls in the dialog visible if the
 * argument is true, and invisible otherwise.
 * 
 * By default the effects selection controls are displayed if the
 * platform font dialog supports effects selection.
 * 
 *
 * @param visible whether or not the dialog will show the effects selection controls
 *
 * @since 3.8
 */
public void setEffectsVisible(boolean visible) {
	effectsVisible = visible;
}

/**
 * Sets a FontData object describing the font to be
 * selected by default in the dialog, or null to let
 * the platform choose one.
 *
 * @param fontData the FontData to use initially, or null
 * @deprecated use #setFontList (FontData [])
 */
@Deprecated
public void setFontData (FontData fontData) {
	this.fontData = fontData;
}

/**
 * Sets the set of FontData objects describing the font to
 * be selected by default in the dialog, or null to let
 * the platform choose one.
 *
 * @param fontData the set of FontData objects to use initially, or null
 *        to let the platform select a default when open() is called
 *
 * @see Font#getFontData
 *
 * @since 2.1.1
 */
public void setFontList (FontData [] fontData) {
	if (fontData != null && fontData.length > 0) {
		this.fontData = fontData [0];
	} else {
		this.fontData = null;
	}
}

/**
 * Sets the RGB describing the color to be selected by default
 * in the dialog, or null to let the platform choose one.
 *
 * @param rgb the RGB value to use initially, or null to let
 *        the platform select a default when open() is called
 *
 * @see PaletteData#getRGBs
 *
 * @since 2.1
 */
public void setRGB (RGB rgb) {
	this.rgb = rgb;
}

int validModesForFontPanel(long /*int*/ id, long /*int*/ sel, long /*int*/ arg0) {
	return effectsVisible ? OS.NSFontPanelAllModesMask : OS.NSFontPanelAllModesMask & ~OS.NSFontPanelAllEffectsModeMask;
}

void windowWillClose(long /*int*/ id, long /*int*/ sel, long /*int*/ sender) {
	NSApplication.sharedApplication().stop(null);
}

}