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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) 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.browser;

import org.eclipse.swt.*;
import org.eclipse.swt.internal.C;
import org.eclipse.swt.internal.mozilla.*;
import org.eclipse.swt.widgets.*;

/**
 * This class implements the nsIHelperAppLauncherDialog interface for mozilla
 * versions >= 10.  For earlier mozilla versions this interface is implemented
 * by class HelperAppLauncherDialog(_1_9).  HelperAppLauncherDialogFactory
 * determines at runtime which of these classes to instantiate.
 */
class HelperAppLauncherDialog_10 extends HelperAppLauncherDialog_1_9 {
	XPCOMObject supports;
	XPCOMObject helperAppLauncherDialog;
	int refCount = 0;

HelperAppLauncherDialog_10 () {
	createCOMInterfaces ();
}

/* nsIHelperAppLauncherDialog */

@Override
int Show (long /*int*/ aLauncher, long /*int*/ aContext, int aReason) {
	nsIHelperAppLauncher_1_8 helperAppLauncher = new nsIHelperAppLauncher_1_8 (aLauncher);
	return helperAppLauncher.SaveToDisk (0, 0);
}

@Override
int PromptForSaveToFile (long /*int*/ aLauncher, long /*int*/ aWindowContext, long /*int*/ aDefaultFileName, long /*int*/ aSuggestedFileExtension, int aForcePrompt, long /*int*/ _retval) {
	int length = XPCOM.strlen_PRUnichar (aDefaultFileName);
	char[] dest = new char[length];
	XPCOM.memmove (dest, aDefaultFileName, length * 2);
	String defaultFile = new String (dest);

	length = XPCOM.strlen_PRUnichar (aSuggestedFileExtension);
	dest = new char[length];
	XPCOM.memmove (dest, aSuggestedFileExtension, length * 2);
	String suggestedFileExtension = new String (dest);

	Shell shell = new Shell ();
	FileDialog fileDialog = new FileDialog (shell, SWT.SAVE);
	fileDialog.setFileName (defaultFile);
	fileDialog.setFilterExtensions (new String[] {suggestedFileExtension});
	String name = fileDialog.open ();
	shell.close ();
	if (name == null) {
		nsICancelable launcher = new nsICancelable (aLauncher);
		int rc = launcher.Cancel (XPCOM.NS_BINDING_ABORTED);
		if (rc != XPCOM.NS_OK) Mozilla.error (rc);
		return XPCOM.NS_ERROR_FAILURE;
	}
	nsEmbedString path = new nsEmbedString (name);
	long /*int*/[] result = new long /*int*/[1];
	int rc = XPCOM.NS_NewLocalFile (path.getAddress (), 1, result);
	path.dispose ();
	if (rc != XPCOM.NS_OK) Mozilla.error (rc);
	if (result[0] == 0) Mozilla.error (XPCOM.NS_ERROR_NULL_POINTER);
	/* Our own nsIDownload has been registered during the Browser initialization. It will be invoked by Mozilla. */
	XPCOM.memmove (_retval, result, C.PTR_SIZEOF);
	return XPCOM.NS_OK;
}
}