bundles/org.eclipse.swt/Eclipse SWT/cocoa/org/eclipse/swt/widgets/FileDialog.java - platform/eclipse.platform.swt - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2017 IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
  * which accompanies this distribution, and is available at
  * https://www.eclipse.org/legal/epl-2.0/
  *
  * SPDX-License-Identifier: EPL-2.0
  *
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.swt.widgets;


 import java.util.*;

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

 /**
  * Instances of this class allow the user to navigate
  * the file system and select or enter a file name.
  * <dl>
  * <dt><b>Styles:</b></dt>
  * <dd>SAVE, OPEN, MULTI</dd>
  * <dt><b>Events:</b></dt>
  * <dd>(none)</dd>
  * </dl>
  * <p>
  * Note: Only one of the styles SAVE and OPEN may be specified.
  * </p><p>
  * IMPORTANT: This class is <em>not</em> intended to be subclassed.
  * </p>
  *
  * @see <a href="http://www.eclipse.org/swt/snippets/#filedialog">FileDialog snippets</a>
  * @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: ControlExample, Dialog tab</a>
  * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
  * @noextend This class is not intended to be subclassed by clients.
  */
 public class FileDialog extends Dialog {
 	Callback callback_completion_handler;
 	Callback callback_overwrite_existing_file;
 	NSSavePanel panel;
 	NSPopUpButton popup;
 	String [] filterNames = new String [0];
 	String [] filterExtensions = new String [0];
 	String [] fileNames = new String[0];
 	String filterPath = "", fileName = "";
 	String fullPath;
 	SWTOpenSavePanelDelegate delegate = null;
 	int filterIndex = -1;
 	long jniRef = 0;
 	long method = 0;
 	long methodImpl = 0;
 	boolean overwrite = false;
 	static final char EXTENSION_SEPARATOR = ';';
 	private String selectedExtension;

 /**
  * 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 <ul>
  *    <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
  * </ul>
  * @exception SWTException <ul>
  *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
  *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
  * </ul>
  */
 public FileDialog (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.
  * <p>
  * The style value is either one of the style constants defined in
  * class <code>SWT</code> which is applicable to instances of this
  * class, or must be built by <em>bitwise OR</em>'ing together
  * (that is, using the <code>int</code> "|" operator) two or more
  * of those <code>SWT</code> style constants. The class description
  * lists the style constants that are applicable to the class.
  * Style bits are also inherited from superclasses.
  * </p>
  *
  * @param parent a shell which will be the parent of the new instance
  * @param style the style of dialog to construct
  *
  * @exception IllegalArgumentException <ul>
  *    <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
  * </ul>
  * @exception SWTException <ul>
  *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
  *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
  * </ul>
  *
  * @see SWT#SAVE
  * @see SWT#OPEN
  * @see SWT#MULTI
  */
 public FileDialog (Shell parent, int style) {
 	super (parent, checkStyle (parent, style));
 	if (Display.getSheetEnabled ()) {
 		if (parent != null && (style & SWT.SHEET) != 0) this.style |= SWT.SHEET;
 	}
 	checkSubclass ();
 }

 long _completionHandler (long result) {
 	handleResponse(result);
 	return result;
 }

 long _overwriteExistingFileCheck (long id, long sel, long str) {
 	return 1;
 }

 /**
  * Appends the extension selected in the filter pop-up to the filename,
  * only if the filename has no extension already.
  */
 private NSString appendSelectedExtension (NSString filename) {
 	String extension = getSelectedExtension();
 	if (filename != null && extension != null) {
 		NSString ext = filename.pathExtension();
 		if (ext == null || ext.length() == 0) {
 			filename = filename.stringByAppendingPathExtension(NSString.stringWith(extension));
 		}
 	}
 	return filename;
 }

 /**
  * Returns the path of the first file that was
  * selected in the dialog relative to the filter path, or an
  * empty string if no such file has been selected.
  *
  * @return the relative path of the file
  */
 public String getFileName () {
 	return fileName;
 }

 /**
  * Returns a (possibly empty) array with the paths of all files
  * that were selected in the dialog relative to the filter path.
  *
  * @return the relative paths of the files
  */
 public String [] getFileNames () {
 	return fileNames;
 }

 /**
  * Returns the file extensions which the dialog will
  * use to filter the files it shows.
  *
  * @return the file extensions filter
  */
 public String [] getFilterExtensions () {
 	return filterExtensions;
 }

 /**
  * Get the 0-based index of the file extension filter
  * which was selected by the user, or -1 if no filter
  * was selected.
  * <p>
  * This is an index into the FilterExtensions array and
  * the FilterNames array.
  * </p>
  *
  * @return index the file extension filter index
  *
  * @see #getFilterExtensions
  * @see #getFilterNames
  *
  * @since 3.4
  */
 public int getFilterIndex () {
 	return filterIndex;
 }

 /**
  * Returns the names that describe the filter extensions
  * which the dialog will use to filter the files it shows.
  *
  * @return the list of filter names
  */
 public String [] getFilterNames () {
 	return filterNames;
 }

 /**
  * Returns the directory path that the dialog will use, or an empty
  * string if this is not set.  File names in this path will appear
  * in the dialog, filtered according to the filter extensions.
  *
  * @return the directory path string
  *
  * @see #setFilterExtensions
  */
 public String getFilterPath () {
 	return filterPath;
 }

 /**
  * Returns the flag that the dialog will use to
  * determine whether to prompt the user for file
  * overwrite if the selected file already exists.
  *
  * @return true if the dialog will prompt for file overwrite, false otherwise
  *
  * @since 3.4
  */
 public boolean getOverwrite () {
 	return overwrite;
 }

 /**
  * Returns the extension selected in the filter pop-up. When the filter has multiple extensions,
  * the first extension us returned.
  * Returns null if no extension is selected or if the selected filter is * or *.*
  */
 private String getSelectedExtension () {
 	return selectedExtension;
 }

 private NSMutableArray getSelectedExtensions () {
 	int filterIndex = popup != null ? (int)popup.indexOfSelectedItem() : -1;
 	if (filterExtensions != null && filterExtensions.length != 0) {
 		if (0 <= filterIndex && filterIndex < filterExtensions.length) {
 			String exts = filterExtensions [filterIndex];
 			int index = exts.indexOf (EXTENSION_SEPARATOR);
 			String[] extensions = index != -1 ? exts.split(";") : new String[] {exts};

 			int length = extensions.length;
 			NSMutableArray allowedFileTypes = NSMutableArray.arrayWithCapacity(length);
 			for (int j = length - 1; j >= 0; j--) {
 				String ext = extensions[j];
 				String filter = ext.trim ();
 				if (!filter.equals ("*") && !filter.equals ("*.*")) {
 					if (filter.startsWith ("*.")) {
 						filter = filter.substring (2);
 					} else if (filter.startsWith (".")) {
 						filter = filter.substring (1);
 					}
 					selectedExtension = filter;
 					/*
 					 * Mac doesn't support multi-part extensions, use only the last part as
 					 * extension in this case.
 					 */
 					int i = filter.lastIndexOf(".");
 					if (i != -1 && ((i + 1) < filter.length())) {
 						filter = filter.substring(i + 1);
 					}
 					allowedFileTypes.insertObject(NSString.stringWith(filter), 0);
 				} else {
 					selectedExtension = null;
 					return null;
 				}
 			}
 			return allowedFileTypes;
 		}
 	}
 	return null;
 }

 void handleResponse (long response) {
 	if (parent != null && (style & SWT.SHEET) != 0) {
 		NSApplication.sharedApplication().stopModal();
 	}
 	Display display = parent != null ? parent.getDisplay() : Display.getCurrent();
 	display.setModalDialog(null);

 	filterIndex = popup != null ? (int)popup.indexOfSelectedItem() : -1;

 	if (response == OS.NSFileHandlingPanelOKButton) {
 		NSString filename = panel.filename();
 		if ((style & SWT.SAVE) != 0) {
 			/*
 			 * This code is intentionally commented. The extension is now appended in the
 			 * delegate method: panel_userEnteredFilename_confirmed
 			 */
 			//filename = appendSelectedExtension(filename);
 			fullPath = filename.getString();
 			fileNames = new String [1];
 			fileName = fileNames [0] = filename.lastPathComponent().getString();
 			filterPath = filename.stringByDeletingLastPathComponent().getString();
 		} else {
 			fullPath = filename.getString();
 			NSArray filenames = ((NSOpenPanel)panel).filenames();
 			int count = (int)filenames.count();
 			fileNames = new String[count];

 			for (int i = 0; i < count; i++) {
 				filename = new NSString(filenames.objectAtIndex(i));
 				NSString filenameOnly = filename.lastPathComponent();
 				NSString pathOnly = filename.stringByDeletingLastPathComponent();

 				if (i == 0) {
 					/* Filter path */
 					filterPath = pathOnly.getString();

 					/* File name */
 					fileName = fileNames [0] = filenameOnly.getString();
 				} else {
 					if (pathOnly.getString().equals (filterPath)) {
 						fileNames [i] = filenameOnly.getString();
 					} else {
 						fileNames [i] = filename.getString();
 					}
 				}
 			}
 		}
 	}
 	releaseHandles();
 }

 /**
  * Makes the dialog visible and brings it to the front
  * of the display.
  *
  * @return a string describing the absolute path of the first selected file,
  *         or null if the dialog was cancelled or an error occurred
  *
  * @exception SWTException <ul>
  *    <li>ERROR_WIDGET_DISPOSED - if the dialog has been disposed</li>
  *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the dialog</li>
  * </ul>
  */
 public String open () {
 	fullPath = null;
 	if ((style & SWT.SAVE) != 0) {
 		NSSavePanel savePanel = NSSavePanel.savePanel();
 		panel = savePanel;
 		if (!overwrite) {
 			callback_overwrite_existing_file = new Callback(this, "_overwriteExistingFileCheck", 3);
 			long proc = callback_overwrite_existing_file.getAddress();
 			method = OS.class_getInstanceMethod(OS.class_NSSavePanel, OS.sel_overwriteExistingFileCheck);
 			if (method != 0) methodImpl = OS.method_setImplementation(method, proc);
 		}
 	} else {
 		NSOpenPanel openPanel = NSOpenPanel.openPanel();
 		openPanel.setAllowsMultipleSelection((style & SWT.MULTI) != 0);
 		panel = openPanel;
 	}
 	panel.setCanCreateDirectories(true);
 	panel.setTitle(NSString.stringWith(title != null ? title : ""));
 	if (filterPath != null && filterPath.length() > 0) {
 		NSString dir = NSString.stringWith(filterPath);
 		panel.setDirectoryURL(NSURL.fileURLWithPath(dir));
 	}
 	if (fileName != null && fileName.length() > 0) {
 		panel.setNameFieldStringValue(NSString.stringWith(fileName));
 	}
 	/*
 	 * This line is intentionally commented. Don't show hidden files forcefully,
 	 * instead allow File dialog to use the system preference.
 	 */
 	//	OS.objc_msgSend(panel.id, OS.sel_setShowsHiddenFiles_, true);
 	jniRef = 0;
 	delegate = null;
 	if (filterExtensions != null && filterExtensions.length != 0) {
 		delegate = (SWTOpenSavePanelDelegate)new SWTOpenSavePanelDelegate().alloc().init();
 		jniRef = OS.NewGlobalRef(this);
 		if (jniRef == 0) error(SWT.ERROR_NO_HANDLES);
 		OS.object_setInstanceVariable(delegate.id, Display.SWT_OBJECT, jniRef);
 		panel.setDelegate(delegate);
 		NSPopUpButton widget = (NSPopUpButton)new NSPopUpButton().alloc();
 		widget.initWithFrame(new NSRect(), false);
 		widget.setTarget(delegate);
 		widget.setAction(OS.sel_sendSelection_);
 		NSMenu menu = widget.menu();
 		menu.setAutoenablesItems(false);
 		for (int i = 0; i < filterExtensions.length; i++) {
 			String str = filterExtensions [i];
 			if (filterNames != null && filterNames.length > i) {
 				str = filterNames [i];
 			}
 			NSMenuItem nsItem = (NSMenuItem)new NSMenuItem().alloc();
 			nsItem.initWithTitle(NSString.stringWith(str), 0, NSString.string());
 			menu.addItem(nsItem);
 			nsItem.release();
 		}
 		int selectionIndex = 0 <= filterIndex && filterIndex < filterExtensions.length ? filterIndex : 0;
 		widget.selectItemAtIndex(selectionIndex);
 		widget.sizeToFit();
 		panel.setAccessoryView(widget);
 		popup = widget;
 		panel.setTreatsFilePackagesAsDirectories(shouldTreatAppAsDirectory(filterExtensions[selectionIndex]));
 		if ((style & SWT.SAVE) != 0) {
 			NSArray extensions = getSelectedExtensions();
 			if (extensions != null) panel.setAllowedFileTypes(extensions);
 			panel.setAllowsOtherFileTypes(true);
 		}
 	} else {
 		panel.setTreatsFilePackagesAsDirectories(false);
 	}
 	Display display = parent != null ? parent.getDisplay() : Display.getCurrent();
 	display.setModalDialog(this, panel);
 	if (parent != null && (style & SWT.SHEET) != 0) {
 		callback_completion_handler = new Callback(this, "_completionHandler", 1);
 		long handler = callback_completion_handler.getAddress();
 		OS.beginSheetModalForWindow(panel, parent.view.window(), handler);
 		NSApplication.sharedApplication().runModalForWindow(parent.view.window());
 	} else {
 		long response = panel.runModal();
 		handleResponse(response);
 	}
 	return fullPath;
 }

 long panel_shouldEnableURL (long id, long sel, long arg0, long arg1) {
 	if ((style & SWT.SAVE) != 0) {
 		/* All filenames are always disabled in the NSSavePanel, so return from here. */
 		return 1;
 	}
 	NSURL url = new NSURL(arg1);
 	NSString path = url.path();
 	if (filterExtensions != null && filterExtensions.length != 0) {
 		NSFileManager manager = NSFileManager.defaultManager();
 		long ptr = C.malloc(1);
 		boolean found = manager.fileExistsAtPath(path, ptr);
 		byte[] isDirectory = new byte[1];
 		C.memmove(isDirectory, ptr, 1);
 		C.free(ptr);
 		if (found) {
 			if (isDirectory[0] != 0) {
 				return 1;
 			} else if (popup != null) {
 				String fileName = path.lastPathComponent().getString();
 				int filterIndex = (int)popup.indexOfSelectedItem();
 				String extensions = filterExtensions [filterIndex];
 				int start = 0, length = extensions.length ();
 				while (start < length) {
 					int index = extensions.indexOf (EXTENSION_SEPARATOR, start);
 					if (index == -1) index = length;
 					String filter = extensions.substring (start, index).trim ();
 					if (filter.equalsIgnoreCase (fileName)) return 1;
 					if (filter.equals ("*") || filter.equals ("*.*")) return 1;
 					if (filter.startsWith ("*.")) {
 						filter = filter.substring (2);
 					} else if (filter.startsWith (".")) {
 						filter = filter.substring (1);
 					}
 					if ((fileName.toLowerCase ()).endsWith("." + filter.toLowerCase ())) return 1;
 					start = index + 1;
 				}
 				return 0;
 			}
 		}
 	}
 	return 1;
 }

 long panel_userEnteredFilename_confirmed (long id, long sel, long sender, long filename, long okFlag) {
 	/*
 	 * From documentation: This delegate method is called when user confirmed
 	 * a filename choice by clicking Save in a Save panel. It's called before any
 	 * required extension is appended to the filename and before the Save panel asks
 	 * the user to replace an existing file, if applicable.
 	 *
 	 * If the filename in the File Dialog's name field has no extension, then the extension from the filter will be
 	 * applied on Save. Add the extension here, so that the NSSavePanel can use this filename with extension
 	 * for validation and show the replace existing file dialog, if required.
 	 */
 	if (okFlag == 0) return filename;
 	NSString filenameWithExtension = new NSString(filename);
 	filenameWithExtension = appendSelectedExtension(filenameWithExtension);
 	return filenameWithExtension.id;
 }

 void releaseHandles() {
 	if (!overwrite) {
 		if (method != 0) OS.method_setImplementation(method, methodImpl);
 		if (callback_overwrite_existing_file != null) callback_overwrite_existing_file.dispose();
 		callback_overwrite_existing_file = null;
 	}
 	if (callback_completion_handler != null) {
 		callback_completion_handler.dispose();
 		callback_completion_handler = null;
 	}
 	if (popup != null) {
 		panel.setAccessoryView(null);
 		popup.release();
 		popup = null;
 	}
 	if (delegate != null) {
 		panel.setDelegate(null);
 		delegate.release();
 		delegate = null;
 	}
 	if (jniRef != 0) OS.DeleteGlobalRef(jniRef);
 	jniRef = 0;
 	panel = null;
 }

 void sendSelection (long id, long sel, long arg) {
 	if (filterExtensions != null && filterExtensions.length > 0) {
 		String fileTypes = filterExtensions[(int)popup.indexOfSelectedItem ()];
 		panel.setTreatsFilePackagesAsDirectories (shouldTreatAppAsDirectory (fileTypes));

 		/*
 		 * Update the allowed file types in the dialog. If extension is not hidden, this
 		 * updates the extension in the name field.
 		 */
 		if ((style & SWT.SAVE) != 0) {
 			panel.setAllowedFileTypes(getSelectedExtensions());
 			return;
 		}
 	}
 	panel.validateVisibleColumns ();
 }

 /**
  * Set the initial filename which the dialog will
  * select by default when opened to the argument,
  * which may be null.  The name will be prefixed with
  * the filter path when one is supplied.
  *
  * @param string the file name
  */
 public void setFileName (String string) {
 	fileName = string;
 }

 /**
  * Set the file extensions which the dialog will
  * use to filter the files it shows to the argument,
  * which may be null.
  * <p>
  * The strings are platform specific. For example, on
  * some platforms, an extension filter string is typically
  * of the form "*.extension", where "*.*" matches all files.
  * For filters with multiple extensions, use semicolon as
  * a separator, e.g. "*.jpg;*.png".
  * </p>
  * <p>
  * Note: On Mac, setting the file extension filter affects how
  * app bundles are treated by the dialog. When a filter extension
  * having the app extension (.app) is selected, bundles are treated
  * as files. For all other extension filters, bundles are treated
  * as directories. When no filter extension is set, bundles are
  * treated as files.
  * </p>
  *
  * @param extensions the file extension filter
  *
  * @see #setFilterNames to specify the user-friendly
  * names corresponding to the extensions
  */
 public void setFilterExtensions (String [] extensions) {
 	filterExtensions = extensions;
 }

 /**
  * Set the 0-based index of the file extension filter
  * which the dialog will use initially to filter the files
  * it shows to the argument.
  * <p>
  * This is an index into the FilterExtensions array and
  * the FilterNames array.
  * </p>
  *
  * @param index the file extension filter index
  *
  * @see #setFilterExtensions
  * @see #setFilterNames
  *
  * @since 3.4
  */
 public void setFilterIndex (int index) {
 	filterIndex = index;
 }

 /**
  * Sets the names that describe the filter extensions
  * which the dialog will use to filter the files it shows
  * to the argument, which may be null.
  * <p>
  * Each name is a user-friendly short description shown for
  * its corresponding filter. The <code>names</code> array must
  * be the same length as the <code>extensions</code> array.
  * </p>
  *
  * @param names the list of filter names, or null for no filter names
  *
  * @see #setFilterExtensions
  */
 public void setFilterNames (String [] names) {
 	filterNames = names;
 }

 /**
  * Sets the directory path that the dialog will use
  * to the argument, which may be null. File names in this
  * path will appear in the dialog, filtered according
  * to the filter extensions. If the string is null,
  * then the operating system's default filter path
  * will be used.
  * <p>
  * Note that the path string is platform dependent.
  * For convenience, either '/' or '\' can be used
  * as a path separator.
  * </p>
  *
  * @param string the directory path
  *
  * @see #setFilterExtensions
  */
 public void setFilterPath (String string) {
 	filterPath = string;
 }

 /**
  * Sets the flag that the dialog will use to
  * determine whether to prompt the user for file
  * overwrite if the selected file already exists.
  *
  * @param overwrite true if the dialog will prompt for file overwrite, false otherwise
  *
  * @since 3.4
  */
 public void setOverwrite (boolean overwrite) {
 	this.overwrite = overwrite;
 }

 /**
  * Determines if the treatAppAsBundle property has to be enabled for the NSOpenPanel
  * for the filterExtensions passed as a parameter.
  */
 boolean shouldTreatAppAsDirectory (String extensions) {
 	if ((style & SWT.SAVE) != 0) return false;
 	StringTokenizer fileTypesToken = new StringTokenizer (extensions, String.valueOf(EXTENSION_SEPARATOR));
 	while (fileTypesToken.hasMoreTokens ()) {
 		String fileType = fileTypesToken.nextToken ();
 		if (fileType.equals ("*") || fileType.equals ("*.*")) return true;
 		if (fileType.equals ("*.app") || fileType.equals (".app")) return false;
 	}
 	return true;
 }

 }
	/*******************************************************************************
	* Copyright (c) 2000, 2017 IBM Corporation and others.
	*
	* This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License 2.0
	* which accompanies this distribution, and is available at
	* https://www.eclipse.org/legal/epl-2.0/
	*
	* SPDX-License-Identifier: EPL-2.0
	*
	* Contributors:
	* IBM Corporation - initial API and implementation
	*******************************************************************************/
	package org.eclipse.swt.widgets;


	import java.util.*;

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

	/**
	* Instances of this class allow the user to navigate
	* the file system and select or enter a file name.
	* <dl>
	* <dt><b>Styles:</b></dt>
	* <dd>SAVE, OPEN, MULTI</dd>
	* <dt><b>Events:</b></dt>
	* <dd>(none)</dd>
	* </dl>
	* <p>
	* Note: Only one of the styles SAVE and OPEN may be specified.
	* </p><p>
	* IMPORTANT: This class is <em>not</em> intended to be subclassed.
	* </p>
	*
	* @see <a href="http://www.eclipse.org/swt/snippets/#filedialog">FileDialog snippets</a>
	* @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: ControlExample, Dialog tab</a>
	* @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
	* @noextend This class is not intended to be subclassed by clients.
	*/
	public class FileDialog extends Dialog {
	Callback callback_completion_handler;
	Callback callback_overwrite_existing_file;
	NSSavePanel panel;
	NSPopUpButton popup;
	String [] filterNames = new String [0];
	String [] filterExtensions = new String [0];
	String [] fileNames = new String[0];
	String filterPath = "", fileName = "";
	String fullPath;
	SWTOpenSavePanelDelegate delegate = null;
	int filterIndex = -1;
	long jniRef = 0;
	long method = 0;
	long methodImpl = 0;
	boolean overwrite = false;
	static final char EXTENSION_SEPARATOR = ';';
	private String selectedExtension;

	/**
	* 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 <ul>
	* <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
	* </ul>
	* @exception SWTException <ul>
	* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
	* <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
	* </ul>
	*/
	public FileDialog (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.
	* <p>
	* The style value is either one of the style constants defined in
	* class <code>SWT</code> which is applicable to instances of this
	* class, or must be built by <em>bitwise OR</em>'ing together
	* (that is, using the <code>int</code> "\|" operator) two or more
	* of those <code>SWT</code> style constants. The class description
	* lists the style constants that are applicable to the class.
	* Style bits are also inherited from superclasses.
	* </p>
	*
	* @param parent a shell which will be the parent of the new instance
	* @param style the style of dialog to construct
	*
	* @exception IllegalArgumentException <ul>
	* <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
	* </ul>
	* @exception SWTException <ul>
	* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
	* <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
	* </ul>
	*
	* @see SWT#SAVE
	* @see SWT#OPEN
	* @see SWT#MULTI
	*/
	public FileDialog (Shell parent, int style) {
	super (parent, checkStyle (parent, style));
	if (Display.getSheetEnabled ()) {
	if (parent != null && (style & SWT.SHEET) != 0) this.style \|= SWT.SHEET;
	}
	checkSubclass ();
	}

	long _completionHandler (long result) {
	handleResponse(result);
	return result;
	}

	long _overwriteExistingFileCheck (long id, long sel, long str) {
	return 1;
	}

	/**
	* Appends the extension selected in the filter pop-up to the filename,
	* only if the filename has no extension already.
	*/
	private NSString appendSelectedExtension (NSString filename) {
	String extension = getSelectedExtension();
	if (filename != null && extension != null) {
	NSString ext = filename.pathExtension();
	if (ext == null \|\| ext.length() == 0) {
	filename = filename.stringByAppendingPathExtension(NSString.stringWith(extension));
	}
	}
	return filename;
	}

	/**
	* Returns the path of the first file that was
	* selected in the dialog relative to the filter path, or an
	* empty string if no such file has been selected.
	*
	* @return the relative path of the file
	*/
	public String getFileName () {
	return fileName;
	}

	/**
	* Returns a (possibly empty) array with the paths of all files
	* that were selected in the dialog relative to the filter path.
	*
	* @return the relative paths of the files
	*/
	public String [] getFileNames () {
	return fileNames;
	}

	/**
	* Returns the file extensions which the dialog will
	* use to filter the files it shows.
	*
	* @return the file extensions filter
	*/
	public String [] getFilterExtensions () {
	return filterExtensions;
	}

	/**
	* Get the 0-based index of the file extension filter
	* which was selected by the user, or -1 if no filter
	* was selected.
	* <p>
	* This is an index into the FilterExtensions array and
	* the FilterNames array.
	* </p>
	*
	* @return index the file extension filter index
	*
	* @see #getFilterExtensions
	* @see #getFilterNames
	*
	* @since 3.4
	*/
	public int getFilterIndex () {
	return filterIndex;
	}

	/**
	* Returns the names that describe the filter extensions
	* which the dialog will use to filter the files it shows.
	*
	* @return the list of filter names
	*/
	public String [] getFilterNames () {
	return filterNames;
	}

	/**
	* Returns the directory path that the dialog will use, or an empty
	* string if this is not set. File names in this path will appear
	* in the dialog, filtered according to the filter extensions.
	*
	* @return the directory path string
	*
	* @see #setFilterExtensions
	*/
	public String getFilterPath () {
	return filterPath;
	}

	/**
	* Returns the flag that the dialog will use to
	* determine whether to prompt the user for file
	* overwrite if the selected file already exists.
	*
	* @return true if the dialog will prompt for file overwrite, false otherwise
	*
	* @since 3.4
	*/
	public boolean getOverwrite () {
	return overwrite;
	}

	/**
	* Returns the extension selected in the filter pop-up. When the filter has multiple extensions,
	* the first extension us returned.
	* Returns null if no extension is selected or if the selected filter is * or .
	*/
	private String getSelectedExtension () {
	return selectedExtension;
	}

	private NSMutableArray getSelectedExtensions () {
	int filterIndex = popup != null ? (int)popup.indexOfSelectedItem() : -1;
	if (filterExtensions != null && filterExtensions.length != 0) {
	if (0 <= filterIndex && filterIndex < filterExtensions.length) {
	String exts = filterExtensions [filterIndex];
	int index = exts.indexOf (EXTENSION_SEPARATOR);
	String[] extensions = index != -1 ? exts.split(";") : new String[] {exts};

	int length = extensions.length;
	NSMutableArray allowedFileTypes = NSMutableArray.arrayWithCapacity(length);
	for (int j = length - 1; j >= 0; j--) {
	String ext = extensions[j];
	String filter = ext.trim ();
	if (!filter.equals ("") && !filter.equals (".*")) {
	if (filter.startsWith ("*.")) {
	filter = filter.substring (2);
	} else if (filter.startsWith (".")) {
	filter = filter.substring (1);
	}
	selectedExtension = filter;
	/*
	* Mac doesn't support multi-part extensions, use only the last part as
	* extension in this case.
	*/
	int i = filter.lastIndexOf(".");
	if (i != -1 && ((i + 1) < filter.length())) {
	filter = filter.substring(i + 1);
	}
	allowedFileTypes.insertObject(NSString.stringWith(filter), 0);
	} else {
	selectedExtension = null;
	return null;
	}
	}
	return allowedFileTypes;
	}
	}
	return null;
	}

	void handleResponse (long response) {
	if (parent != null && (style & SWT.SHEET) != 0) {
	NSApplication.sharedApplication().stopModal();
	}
	Display display = parent != null ? parent.getDisplay() : Display.getCurrent();
	display.setModalDialog(null);

	filterIndex = popup != null ? (int)popup.indexOfSelectedItem() : -1;

	if (response == OS.NSFileHandlingPanelOKButton) {
	NSString filename = panel.filename();
	if ((style & SWT.SAVE) != 0) {
	/*
	* This code is intentionally commented. The extension is now appended in the
	* delegate method: panel_userEnteredFilename_confirmed
	*/
	//filename = appendSelectedExtension(filename);
	fullPath = filename.getString();
	fileNames = new String [1];
	fileName = fileNames [0] = filename.lastPathComponent().getString();
	filterPath = filename.stringByDeletingLastPathComponent().getString();
	} else {
	fullPath = filename.getString();
	NSArray filenames = ((NSOpenPanel)panel).filenames();
	int count = (int)filenames.count();
	fileNames = new String[count];

	for (int i = 0; i < count; i++) {
	filename = new NSString(filenames.objectAtIndex(i));
	NSString filenameOnly = filename.lastPathComponent();
	NSString pathOnly = filename.stringByDeletingLastPathComponent();

	if (i == 0) {
	/* Filter path */
	filterPath = pathOnly.getString();

	/* File name */
	fileName = fileNames [0] = filenameOnly.getString();
	} else {
	if (pathOnly.getString().equals (filterPath)) {
	fileNames [i] = filenameOnly.getString();
	} else {
	fileNames [i] = filename.getString();
	}
	}
	}
	}
	}
	releaseHandles();
	}

	/**
	* Makes the dialog visible and brings it to the front
	* of the display.
	*
	* @return a string describing the absolute path of the first selected file,
	* or null if the dialog was cancelled or an error occurred
	*
	* @exception SWTException <ul>
	* <li>ERROR_WIDGET_DISPOSED - if the dialog has been disposed</li>
	* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the dialog</li>
	* </ul>
	*/
	public String open () {
	fullPath = null;
	if ((style & SWT.SAVE) != 0) {
	NSSavePanel savePanel = NSSavePanel.savePanel();
	panel = savePanel;
	if (!overwrite) {
	callback_overwrite_existing_file = new Callback(this, "_overwriteExistingFileCheck", 3);
	long proc = callback_overwrite_existing_file.getAddress();
	method = OS.class_getInstanceMethod(OS.class_NSSavePanel, OS.sel_overwriteExistingFileCheck);
	if (method != 0) methodImpl = OS.method_setImplementation(method, proc);
	}
	} else {
	NSOpenPanel openPanel = NSOpenPanel.openPanel();
	openPanel.setAllowsMultipleSelection((style & SWT.MULTI) != 0);
	panel = openPanel;
	}
	panel.setCanCreateDirectories(true);
	panel.setTitle(NSString.stringWith(title != null ? title : ""));
	if (filterPath != null && filterPath.length() > 0) {
	NSString dir = NSString.stringWith(filterPath);
	panel.setDirectoryURL(NSURL.fileURLWithPath(dir));
	}
	if (fileName != null && fileName.length() > 0) {
	panel.setNameFieldStringValue(NSString.stringWith(fileName));
	}
	/*
	* This line is intentionally commented. Don't show hidden files forcefully,
	* instead allow File dialog to use the system preference.
	*/
	// OS.objc_msgSend(panel.id, OS.sel_setShowsHiddenFiles_, true);
	jniRef = 0;
	delegate = null;
	if (filterExtensions != null && filterExtensions.length != 0) {
	delegate = (SWTOpenSavePanelDelegate)new SWTOpenSavePanelDelegate().alloc().init();
	jniRef = OS.NewGlobalRef(this);
	if (jniRef == 0) error(SWT.ERROR_NO_HANDLES);
	OS.object_setInstanceVariable(delegate.id, Display.SWT_OBJECT, jniRef);
	panel.setDelegate(delegate);
	NSPopUpButton widget = (NSPopUpButton)new NSPopUpButton().alloc();
	widget.initWithFrame(new NSRect(), false);
	widget.setTarget(delegate);
	widget.setAction(OS.sel_sendSelection_);
	NSMenu menu = widget.menu();
	menu.setAutoenablesItems(false);
	for (int i = 0; i < filterExtensions.length; i++) {
	String str = filterExtensions [i];
	if (filterNames != null && filterNames.length > i) {
	str = filterNames [i];
	}
	NSMenuItem nsItem = (NSMenuItem)new NSMenuItem().alloc();
	nsItem.initWithTitle(NSString.stringWith(str), 0, NSString.string());
	menu.addItem(nsItem);
	nsItem.release();
	}
	int selectionIndex = 0 <= filterIndex && filterIndex < filterExtensions.length ? filterIndex : 0;
	widget.selectItemAtIndex(selectionIndex);
	widget.sizeToFit();
	panel.setAccessoryView(widget);
	popup = widget;
	panel.setTreatsFilePackagesAsDirectories(shouldTreatAppAsDirectory(filterExtensions[selectionIndex]));
	if ((style & SWT.SAVE) != 0) {
	NSArray extensions = getSelectedExtensions();
	if (extensions != null) panel.setAllowedFileTypes(extensions);
	panel.setAllowsOtherFileTypes(true);
	}
	} else {
	panel.setTreatsFilePackagesAsDirectories(false);
	}
	Display display = parent != null ? parent.getDisplay() : Display.getCurrent();
	display.setModalDialog(this, panel);
	if (parent != null && (style & SWT.SHEET) != 0) {
	callback_completion_handler = new Callback(this, "_completionHandler", 1);
	long handler = callback_completion_handler.getAddress();
	OS.beginSheetModalForWindow(panel, parent.view.window(), handler);
	NSApplication.sharedApplication().runModalForWindow(parent.view.window());
	} else {
	long response = panel.runModal();
	handleResponse(response);
	}
	return fullPath;
	}

	long panel_shouldEnableURL (long id, long sel, long arg0, long arg1) {
	if ((style & SWT.SAVE) != 0) {
	/* All filenames are always disabled in the NSSavePanel, so return from here. */
	return 1;
	}
	NSURL url = new NSURL(arg1);
	NSString path = url.path();
	if (filterExtensions != null && filterExtensions.length != 0) {
	NSFileManager manager = NSFileManager.defaultManager();
	long ptr = C.malloc(1);
	boolean found = manager.fileExistsAtPath(path, ptr);
	byte[] isDirectory = new byte[1];
	C.memmove(isDirectory, ptr, 1);
	C.free(ptr);
	if (found) {
	if (isDirectory[0] != 0) {
	return 1;
	} else if (popup != null) {
	String fileName = path.lastPathComponent().getString();
	int filterIndex = (int)popup.indexOfSelectedItem();
	String extensions = filterExtensions [filterIndex];
	int start = 0, length = extensions.length ();
	while (start < length) {
	int index = extensions.indexOf (EXTENSION_SEPARATOR, start);
	if (index == -1) index = length;
	String filter = extensions.substring (start, index).trim ();
	if (filter.equalsIgnoreCase (fileName)) return 1;
	if (filter.equals ("") \|\| filter.equals (".*")) return 1;
	if (filter.startsWith ("*.")) {
	filter = filter.substring (2);
	} else if (filter.startsWith (".")) {
	filter = filter.substring (1);
	}
	if ((fileName.toLowerCase ()).endsWith("." + filter.toLowerCase ())) return 1;
	start = index + 1;
	}
	return 0;
	}
	}
	}
	return 1;
	}

	long panel_userEnteredFilename_confirmed (long id, long sel, long sender, long filename, long okFlag) {
	/*
	* From documentation: This delegate method is called when user confirmed
	* a filename choice by clicking Save in a Save panel. It's called before any
	* required extension is appended to the filename and before the Save panel asks
	* the user to replace an existing file, if applicable.
	*
	* If the filename in the File Dialog's name field has no extension, then the extension from the filter will be
	* applied on Save. Add the extension here, so that the NSSavePanel can use this filename with extension
	* for validation and show the replace existing file dialog, if required.
	*/
	if (okFlag == 0) return filename;
	NSString filenameWithExtension = new NSString(filename);
	filenameWithExtension = appendSelectedExtension(filenameWithExtension);
	return filenameWithExtension.id;
	}

	void releaseHandles() {
	if (!overwrite) {
	if (method != 0) OS.method_setImplementation(method, methodImpl);
	if (callback_overwrite_existing_file != null) callback_overwrite_existing_file.dispose();
	callback_overwrite_existing_file = null;
	}
	if (callback_completion_handler != null) {
	callback_completion_handler.dispose();
	callback_completion_handler = null;
	}
	if (popup != null) {
	panel.setAccessoryView(null);
	popup.release();
	popup = null;
	}
	if (delegate != null) {
	panel.setDelegate(null);
	delegate.release();
	delegate = null;
	}
	if (jniRef != 0) OS.DeleteGlobalRef(jniRef);
	jniRef = 0;
	panel = null;
	}

	void sendSelection (long id, long sel, long arg) {
	if (filterExtensions != null && filterExtensions.length > 0) {
	String fileTypes = filterExtensions[(int)popup.indexOfSelectedItem ()];
	panel.setTreatsFilePackagesAsDirectories (shouldTreatAppAsDirectory (fileTypes));

	/*
	* Update the allowed file types in the dialog. If extension is not hidden, this
	* updates the extension in the name field.
	*/
	if ((style & SWT.SAVE) != 0) {
	panel.setAllowedFileTypes(getSelectedExtensions());
	return;
	}
	}
	panel.validateVisibleColumns ();
	}

	/**
	* Set the initial filename which the dialog will
	* select by default when opened to the argument,
	* which may be null. The name will be prefixed with
	* the filter path when one is supplied.
	*
	* @param string the file name
	*/
	public void setFileName (String string) {
	fileName = string;
	}

	/**
	* Set the file extensions which the dialog will
	* use to filter the files it shows to the argument,
	* which may be null.
	* <p>
	* The strings are platform specific. For example, on
	* some platforms, an extension filter string is typically
	* of the form ".extension", where ".*" matches all files.
	* For filters with multiple extensions, use semicolon as
	* a separator, e.g. ".jpg;.png".
	* </p>
	* <p>
	* Note: On Mac, setting the file extension filter affects how
	* app bundles are treated by the dialog. When a filter extension
	* having the app extension (.app) is selected, bundles are treated
	* as files. For all other extension filters, bundles are treated
	* as directories. When no filter extension is set, bundles are
	* treated as files.
	* </p>
	*
	* @param extensions the file extension filter
	*
	* @see #setFilterNames to specify the user-friendly
	* names corresponding to the extensions
	*/
	public void setFilterExtensions (String [] extensions) {
	filterExtensions = extensions;
	}

	/**
	* Set the 0-based index of the file extension filter
	* which the dialog will use initially to filter the files
	* it shows to the argument.
	* <p>
	* This is an index into the FilterExtensions array and
	* the FilterNames array.
	* </p>
	*
	* @param index the file extension filter index
	*
	* @see #setFilterExtensions
	* @see #setFilterNames
	*
	* @since 3.4
	*/
	public void setFilterIndex (int index) {
	filterIndex = index;
	}

	/**
	* Sets the names that describe the filter extensions
	* which the dialog will use to filter the files it shows
	* to the argument, which may be null.
	* <p>
	* Each name is a user-friendly short description shown for
	* its corresponding filter. The <code>names</code> array must
	* be the same length as the <code>extensions</code> array.
	* </p>
	*
	* @param names the list of filter names, or null for no filter names
	*
	* @see #setFilterExtensions
	*/
	public void setFilterNames (String [] names) {
	filterNames = names;
	}

	/**
	* Sets the directory path that the dialog will use
	* to the argument, which may be null. File names in this
	* path will appear in the dialog, filtered according
	* to the filter extensions. If the string is null,
	* then the operating system's default filter path
	* will be used.
	* <p>
	* Note that the path string is platform dependent.
	* For convenience, either '/' or '\' can be used
	* as a path separator.
	* </p>
	*
	* @param string the directory path
	*
	* @see #setFilterExtensions
	*/
	public void setFilterPath (String string) {
	filterPath = string;
	}

	/**
	* Sets the flag that the dialog will use to
	* determine whether to prompt the user for file
	* overwrite if the selected file already exists.
	*
	* @param overwrite true if the dialog will prompt for file overwrite, false otherwise
	*
	* @since 3.4
	*/
	public void setOverwrite (boolean overwrite) {
	this.overwrite = overwrite;
	}

	/**
	* Determines if the treatAppAsBundle property has to be enabled for the NSOpenPanel
	* for the filterExtensions passed as a parameter.
	*/
	boolean shouldTreatAppAsDirectory (String extensions) {
	if ((style & SWT.SAVE) != 0) return false;
	StringTokenizer fileTypesToken = new StringTokenizer (extensions, String.valueOf(EXTENSION_SEPARATOR));
	while (fileTypesToken.hasMoreTokens ()) {
	String fileType = fileTypesToken.nextToken ();
	if (fileType.equals ("") \|\| fileType.equals (".*")) return true;
	if (fileType.equals ("*.app") \|\| fileType.equals (".app")) return false;
	}
	return true;
	}

	}