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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, 2015 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
 *     Lars Vogel  - Bug 483540
 *******************************************************************************/
package org.eclipse.swt.widgets;


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

/**
 * Instances of this class are controls that allow the user
 * to choose an item from a list of items, or optionally
 * enter a new value by typing it into an editable text
 * field. Often, Combos are used in the same place
 * where a single selection List widget could
 * be used but space is limited. A Combo takes
 * less space than a List widget and shows
 * similar information.
 * 
    
 * Note: Since Combos can contain both a list
 * and an editable text field, it is possible to confuse methods
 * which access one versus the other (compare for example,
 * clearSelection() and deselectAll()).
 * The API documentation is careful to indicate either "the
 * receiver's list" or the "the receiver's text field" to
 * distinguish between the two cases.
 * 
    
 * Note that although this class is a subclass of Composite,
 * it does not make sense to add children to it, or set a layout on it.
 * 
    
 * 
    
 * 
    Styles:
    
 * 
    DROP_DOWN, READ_ONLY, SIMPLE
    
 * 
    Events:
    
 * 
    DefaultSelection, Modify, Selection, Verify, OrientationChange
    
 * 
    
 * 
    
 * Note: Only one of the styles DROP_DOWN and SIMPLE may be specified.
 * 
    
 * IMPORTANT: This class is not intended to be subclassed.
 * 
    
 *
 * @see List
 * @see Combo snippets
 * @see SWT Example: ControlExample
 * @see Sample code and further information
 * @noextend This class is not intended to be subclassed by clients.
 */
public class Combo extends Composite {
	String text;
	int textLimit = LIMIT;
	boolean receivingFocus;
	boolean ignoreSetObject, ignoreSelection;
	NSRange selectionRange;
	boolean listVisible;

	static final int VISIBLE_COUNT = 5;

	/**
	 * the operating system limit for the number of characters
	 * that the text field in an instance of this class can hold
	 */
	public static final int LIMIT;

	/*
	* These values can be different on different platforms.
	* Therefore they are not initialized in the declaration
	* to stop the compiler from inlining.
	*/
	static {
		LIMIT = 0x7FFFFFFF;
	}


/**
 * 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#DROP_DOWN
 * @see SWT#READ_ONLY
 * @see SWT#SIMPLE
 * @see Widget#checkSubclass
 * @see Widget#getStyle
 */
public Combo (Composite parent, int style) {
	super (parent, checkStyle (style));
}

/**
 * Adds the argument to the end of the receiver's list.
 * 
    
 * Note: If control characters like '\n', '\t' etc. are used
 * in the string, then the behavior is platform dependent.
 * 
    
 * @param string the new item
 *
 * @exception IllegalArgumentException 
      
 *    
    • ERROR_NULL_ARGUMENT - if the string 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 #add(String,int)
 */
public void add (String string) {
	checkWidget ();
	if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
	NSAttributedString str = createString(string);
	if ((style & SWT.READ_ONLY) != 0) {
		NSPopUpButton widget = (NSPopUpButton)view;
		long /*int*/ selection = widget.indexOfSelectedItem();
		NSMenu nsMenu = widget.menu();
		NSMenuItem nsItem = (NSMenuItem)new NSMenuItem().alloc();
		NSString empty = NSString.string();
		nsItem.initWithTitle(empty, 0, empty);
		nsItem.setAttributedTitle(str);
		nsMenu.addItem(nsItem);
		nsItem.release();
		if (selection == -1) widget.selectItemAtIndex(-1);
	} else {
		((NSComboBox)view).addItemWithObjectValue(str);
	}
}

/**
 * Adds the argument to the receiver's list at the given
 * zero-relative index.
 * 
    
 * Note: To add an item at the end of the list, use the
 * result of calling getItemCount() as the
 * index or use add(String).
 * 
    
 * Also note, if control characters like '\n', '\t' etc. are used
 * in the string, then the behavior is platform dependent.
 * 
    
 *
 * @param string the new item
 * @param index the index for the item
 *
 * @exception IllegalArgumentException 
      
 *    
    • ERROR_NULL_ARGUMENT - if the string is null
      • 
 *    
    • ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list (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
      • 
 * 
    
 *
 * @see #add(String)
 */
public void add (String string, int index) {
	checkWidget ();
	if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
	int count = getItemCount ();
	if (0 > index || index > count) error (SWT.ERROR_INVALID_RANGE);
	NSAttributedString str = createString(string);
	if ((style & SWT.READ_ONLY) != 0) {
		NSPopUpButton widget = (NSPopUpButton)view;
		long /*int*/ selection = widget.indexOfSelectedItem();
		NSMenu nsMenu = widget.menu();
		NSMenuItem nsItem = (NSMenuItem)new NSMenuItem().alloc();
		NSString empty = NSString.string();
		nsItem.initWithTitle(empty, 0, empty);
		nsItem.setAttributedTitle(str);
		nsMenu.insertItem(nsItem, index);
		nsItem.release();
		if (selection == -1) widget.selectItemAtIndex(-1);
	} else {
		((NSComboBox)view).insertItemWithObjectValue(str, index);
	}
}

/**
 * Adds the listener to the collection of listeners who will
 * be notified when the receiver's text is modified, by sending
 * it one of the messages defined in the ModifyListener
 * 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 ModifyListener
 * @see #removeModifyListener
 */
public void addModifyListener (ModifyListener listener) {
	checkWidget();
	if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
	TypedListener typedListener = new TypedListener (listener);
	addListener (SWT.Modify, typedListener);
}

/**
 * Adds a segment listener.
 * 
    
 * A SegmentEvent is sent whenever text content is being modified or
 * a segment listener is added or removed. You can
 * customize the appearance of text by indicating certain characters to be inserted
 * at certain text offsets. This may be used for bidi purposes, e.g. when
 * adjacent segments of right-to-left text should not be reordered relative to
 * each other.
 * E.g., multiple Java string literals in a right-to-left language
 * should generally remain in logical order to each other, that is, the
 * way they are stored.
 * 
    
 * 
    
 * Warning: This API is currently only implemented on Windows.
 * SegmentEvents won't be sent on GTK and Cocoa.
 * 
    
 *
 * @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 SegmentEvent
 * @see SegmentListener
 * @see #removeSegmentListener
 *
 * @since 3.103
 */
public void addSegmentListener (SegmentListener listener) {
	checkWidget ();
	if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
	addListener (SWT.Segments, new TypedListener (listener));
}

/**
 * Adds the listener to the collection of listeners who will
 * be notified when the user changes the receiver's selection, by sending
 * it one of the messages defined in the SelectionListener
 * interface.
 * 
    
 * widgetSelected is called when the user changes the combo's list selection.
 * widgetDefaultSelected is typically called when ENTER is pressed the combo's text area.
 * 
    
 *
 * @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 SelectionListener
 * @see #removeSelectionListener
 * @see SelectionEvent
 */
public void addSelectionListener(SelectionListener listener) {
	checkWidget();
	if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
	TypedListener typedListener = new TypedListener (listener);
	addListener (SWT.Selection,typedListener);
	addListener (SWT.DefaultSelection,typedListener);
}

/**
 * Adds the listener to the collection of listeners who will
 * be notified when the receiver's text is verified, by sending
 * it one of the messages defined in the VerifyListener
 * 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 VerifyListener
 * @see #removeVerifyListener
 *
 * @since 3.1
 */
public void addVerifyListener (VerifyListener listener) {
	checkWidget();
	if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
	TypedListener typedListener = new TypedListener (listener);
	addListener (SWT.Verify, typedListener);
}

@Override
boolean becomeFirstResponder (long /*int*/ id, long /*int*/ sel) {
	receivingFocus = true;
	boolean result = super.becomeFirstResponder (id, sel);
	receivingFocus = false;
	return result;
}

static int checkStyle (int style) {
	/*
	* Feature in Windows.  It is not possible to create
	* a combo box that has a border using Windows style
	* bits.  All combo boxes draw their own border and
	* do not use the standard Windows border styles.
	* Therefore, no matter what style bits are specified,
	* clear the BORDER bits so that the SWT style will
	* match the Windows widget.
	*
	* The Windows behavior is currently implemented on
	* all platforms.
	*/
	style &= ~SWT.BORDER;

	/*
	* Even though it is legal to create this widget
	* with scroll bars, they serve no useful purpose
	* because they do not automatically scroll the
	* widget's client area.  The fix is to clear
	* the SWT style.
	*/
	style &= ~(SWT.H_SCROLL | SWT.V_SCROLL);
	style = checkBits (style, SWT.DROP_DOWN, SWT.SIMPLE, 0, 0, 0, 0);
	if ((style & SWT.SIMPLE) != 0) return style & ~SWT.READ_ONLY;
	return style;
}

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

/**
 * Sets the selection in the receiver's text field to an empty
 * selection starting just before the first character. If the
 * text field is editable, this has the effect of placing the
 * i-beam at the start of the text.
 * 
    
 * Note: To clear the selected items in the receiver's list,
 * use deselectAll().
 * 
    
 *
 * @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 #deselectAll
 */
public void clearSelection () {
	checkWidget();
	if ((style & SWT.READ_ONLY) == 0) {
		Point selection = getSelection ();
		selection.y = selection.x;
		setSelection (selection);
	}
}

@Override
void setObjectValue(long /*int*/ id, long /*int*/ sel, long /*int*/ arg0) {
	super.setObjectValue(id, sel, ignoreSetObject ? arg0 : createString(text).id);
}

@Override
void comboBoxSelectionDidChange(long /*int*/ id, long /*int*/ sel, long /*int*/ notification) {
	NSComboBox widget = (NSComboBox)view;
	long /*int*/ tableSelection = widget.indexOfSelectedItem();
	widget.selectItemAtIndex(tableSelection);
	NSAttributedString attStr = new NSAttributedString (widget.itemObjectValueAtIndex(tableSelection));
	NSString nsString = attStr.string();
	if (nsString != null) setText(nsString.getString(), true);
	if (!ignoreSelection) sendSelectionEvent (SWT.Selection, null, display.trackingControl != this);
}

@Override
public Point computeSize (int wHint, int hHint, boolean changed) {
	checkWidget ();
	int width = 0, height = 0;
	NSControl widget = (NSControl)view;
	NSCell viewCell = widget.cell ();
	NSSize size = viewCell.cellSize ();
	width = (int)Math.ceil (size.width);
	height = (int)Math.ceil (size.height);

	if ((style & SWT.READ_ONLY) == 0) {
		ignoreSetObject = true;
		NSComboBoxCell cell = new NSComboBoxCell (viewCell.id);
		NSArray array = cell.objectValues ();
		int length = (int)/*64*/array.count ();
		if (length > 0) {
			cell = new NSComboBoxCell (cell.copy ());
			for (int i = 0; i < length; i++) {
				NSAttributedString attStr = new NSAttributedString (array.objectAtIndex (i));
				cell.setAttributedStringValue(attStr);
				size = cell.cellSize ();
				width = Math.max (width, (int)Math.ceil (size.width));
			}
			cell.release ();
		}
		ignoreSetObject = false;

		/*
		 * Attempting to create an NSComboBox with a height > 27 spews a
		 * very long warning message to stdout and draws the combo incorrectly.
		 * Limit height to frame height when combo has multiline text.
		 */
		NSString nsStr = widget.stringValue();
		if (nsStr != null ){
			String str = nsStr.getString();
			if (str != null && (str.indexOf('\n') >= 0 || str.indexOf('\r') >= 0)){
				int frameHeight = (int) view.frame().height;
				if (frameHeight > 0){
					height = frameHeight;
				}
			}
		}
	} else {
		/*
		 * In a SWT.READ_ONLY Combo with single item, but no selection,
		 * the width of the cell returned by cellSize() is smaller than expected.
		 * Get the correct width by setting and resetting the selected item.
		 */
		NSPopUpButton nsPopUpButton = (NSPopUpButton)view;
		if ((nsPopUpButton.numberOfItems () == 1) && (nsPopUpButton.indexOfSelectedItem () == -1)) {
			nsPopUpButton.selectItemAtIndex (0);
			size = viewCell.cellSize ();
			width = Math.max (width, (int)Math.ceil (size.width));
			nsPopUpButton.selectItemAtIndex (-1);
		}
	}

	/*
	* Feature in Cocoa.  Attempting to create an NSComboBox with a
	* height > 27 spews a very long warning message to stdout and
	* often draws the combo incorrectly.  The workaround is to limit
	* the returned height of editable Combos to the height that is
	* required to display their text, even if a larger hHint is specified.
	*/
	if (hHint != SWT.DEFAULT) {
		if ((style & SWT.READ_ONLY) != 0 || hHint < height) height = hHint;
	}
	if (wHint != SWT.DEFAULT) width = wHint;
	return new Point (width, height);
}

/**
 * Copies the selected text.
 * 
    
 * The current selection is copied to the clipboard.
 * 
    
 *
 * @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
      • 
 * 
    
 *
 * @since 2.1
 */
public void copy () {
	checkWidget ();
	Point selection = getSelection ();
	if (selection.x == selection.y) return;
	copyToClipboard (getText (selection.x, selection.y));
}

@Override
void createHandle () {
	if ((style & SWT.READ_ONLY) != 0) {
		NSPopUpButton widget = (NSPopUpButton)new SWTPopUpButton().alloc();
		widget.initWithFrame(new NSRect(), false);
		widget.menu().setAutoenablesItems(false);
		widget.setTarget(widget);
		widget.setAction(OS.sel_sendSelection);
		widget.menu().setDelegate(widget);
		view = widget;
	} else {
		NSComboBox widget = (NSComboBox)new SWTComboBox().alloc();
		widget.init();
		widget.setDelegate(widget);
		NSCell cell = widget.cell();
		if (OS.VERSION >= 0x1060 && cell != null){
			cell.setUsesSingleLineMode(true);
		}
		view = widget;
	}
}

NSAttributedString createString(String string) {
	NSAttributedString attribStr = createString(string, null, foreground, SWT.LEFT, false, true, false);
	attribStr.autorelease();
	return attribStr;
}

@Override
void createWidget() {
	text = "";
	super.createWidget();
	if ((style & SWT.READ_ONLY) == 0) {
		NSComboBox widget = (NSComboBox)view;
		NSScreen screen = widget.window().screen();
		NSRect rect = screen != null ? screen.frame() : NSScreen.mainScreen().frame();
		int visibleCount = Math.max(VISIBLE_COUNT, (int)(rect.height / 3 / widget.itemHeight()));
		widget.setNumberOfVisibleItems(visibleCount);
	}
}

@Override
void comboBoxWillDismiss(long /*int*/ id, long /*int*/ sel, long /*int*/ notification) {
	display.currentCombo = null;
	listVisible = false;
}

@Override
void comboBoxWillPopUp(long /*int*/ id, long /*int*/ sel, long /*int*/ notification) {
	display.currentCombo = this;
	listVisible = true;
}

/**
 * Cuts the selected text.
 * 
    
 * The current selection is first copied to the
 * clipboard and then deleted from the widget.
 * 
    
 *
 * @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
      • 
 * 
    
 *
 * @since 2.1
 */
public void cut () {
	checkWidget ();
	if ((style & SWT.READ_ONLY) != 0) return;
	Point selection = getSelection ();
	if (selection.x == selection.y) return;
	int start = selection.x, end = selection.y;
	String text = getText ();
	String leftText = text.substring (0, start);
	String rightText = text.substring (end, text.length ());
	String oldText = text.substring (start, end);
	String newText = "";
	if (hooks (SWT.Verify) || filters (SWT.Verify)) {
		newText = verifyText (newText, start, end, null);
		if (newText == null) return;
	}
	char [] buffer = new char [oldText.length ()];
	oldText.getChars (0, buffer.length, buffer, 0);
	copyToClipboard (buffer);
	setText (leftText + newText + rightText, false);
	start += newText.length ();
	setSelection (new Point (start, start));
	sendEvent (SWT.Modify);
}

@Override
Color defaultBackground () {
    return display.getWidgetColor (SWT.COLOR_LIST_BACKGROUND);
}

@Override
NSFont defaultNSFont() {
	if ((style & SWT.READ_ONLY) != 0) return display.popUpButtonFont;
	return display.comboBoxFont;
}

@Override
Color defaultForeground () {
    return display.getWidgetColor (SWT.COLOR_LIST_FOREGROUND);
}

@Override
void deregister() {
	super.deregister();
	display.removeWidget(((NSControl)view).cell());
}

/**
 * Deselects the item at the given zero-relative index in the receiver's
 * list.  If the item at the index was already deselected, it remains
 * deselected. Indices that are out of range are ignored.
 *
 * @param index the index of the item to deselect
 *
 * @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 deselect (int index) {
	checkWidget ();
	if (index == -1) return;
	if (index == getSelectionIndex ()) {
		if ((style & SWT.READ_ONLY) != 0) {
			((NSPopUpButton)view).selectItem(null);
			sendEvent (SWT.Modify);
		} else {
			((NSComboBox)view).deselectItemAtIndex(index);
		}
	}
}

/**
 * Deselects all selected items in the receiver's list.
 * 
    
 * Note: To clear the selection in the receiver's text field,
 * use clearSelection().
 * 
    
 *
 * @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 #clearSelection
 */
public void deselectAll () {
	checkWidget ();
	if ((style & SWT.READ_ONLY) != 0) {
		((NSPopUpButton)view).selectItem(null);
		sendEvent (SWT.Modify);
	} else {
		NSComboBox widget = (NSComboBox)view;
		long /*int*/ index = widget.indexOfSelectedItem();
		if (index != -1) widget.deselectItemAtIndex(index);
	}
}

@Override
boolean dragDetect(int x, int y, boolean filter, boolean[] consume) {
	if ((style & SWT.READ_ONLY) == 0) {
		NSText fieldEditor = ((NSControl)view).currentEditor();
		if (fieldEditor != null) {
			NSRange selectedRange = fieldEditor.selectedRange();
			if (selectedRange.length > 0) {
				NSTextView feAsTextView = new NSTextView(fieldEditor);
				NSPoint textViewMouse = new NSPoint();
				textViewMouse.x = x;
				textViewMouse.y = y;
				long /*int*/ charPosition = feAsTextView.characterIndexForInsertionAtPoint(textViewMouse);
				if (charPosition != OS.NSNotFound && charPosition >= selectedRange.location && charPosition < (selectedRange.location + selectedRange.length)) {
					if (super.dragDetect(x, y, filter, consume)) {
						if (consume != null) consume[0] = true;
						return true;
					}
				}
			}
		}
		return false;
	}

	return super.dragDetect(x, y, filter, consume);
}

@Override
Cursor findCursor () {
	Cursor cursor = super.findCursor ();
	return (cursor != null || (style & SWT.READ_ONLY) != 0) ? cursor : display.getSystemCursor (SWT.CURSOR_IBEAM);
}

@Override
NSRect focusRingMaskBoundsForFrame (long /*int*/ id, long /*int*/ sel, NSRect cellFrame, long /*int*/ view) {
	return cellFrame;
}

/**
 * Returns the character position of the caret.
 * 
    
 * Indexing is zero based.
 * 
    
 *
 * @return the position of the caret
 *
 * @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
      • 
 * 
    
 *
 * @since 3.8
 */
public int getCaretPosition() {
	checkWidget();
	return selectionRange != null ? (int)/*64*/selectionRange.location : 0;
}

/**
 * Returns a point describing the location of the caret relative
 * to the receiver.
 *
 * @return a point, the location of the caret
 *
 * @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
      • 
 * 
    
 *
 * @since 3.8
 */
public Point getCaretLocation() {
	checkWidget();
	NSTextView widget = null;
	if (this.hasFocus()) {
		widget = new NSTextView(view.window().fieldEditor(true, view));
	}
	if (widget == null) return new Point (0, 0);
	NSLayoutManager layoutManager = widget.layoutManager();
	NSTextContainer container = widget.textContainer();
	NSRange range = widget.selectedRange();
	long /*int*/ [] rectCount = new long /*int*/ [1];
	long /*int*/ pArray = layoutManager.rectArrayForCharacterRange(range, range, container, rectCount);
	NSRect rect = new NSRect();
	if (rectCount[0] > 0) OS.memmove(rect, pArray, NSRect.sizeof);
	NSPoint pt = new NSPoint();
	pt.x = (int)rect.x;
	pt.y = (int)rect.y;
	pt = widget.convertPoint_toView_(pt, view);
	return new Point((int)pt.x, (int)pt.y);
}

int getCharCount() {
	NSString str;
	if ((style & SWT.READ_ONLY) != 0) {
		str = ((NSPopUpButton)view).titleOfSelectedItem();
	} else {
		str = new NSCell(((NSComboBox)view).cell()).title();
	}
	if (str == null) return 0;
	return (int)/*64*/str.length();
}

/**
 * Returns the item at the given, zero-relative index in the
 * receiver's list. 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 String getItem (int index) {
	checkWidget ();
	int count = getItemCount ();
	if (0 > index || index >= count) error (SWT.ERROR_INVALID_RANGE);
	NSString str = null;
	if ((style & SWT.READ_ONLY) != 0) {
		str = ((NSPopUpButton)view).itemTitleAtIndex(index);
	} else {
		NSAttributedString attString = new NSAttributedString(((NSComboBox)view).itemObjectValueAtIndex(index));
		if (attString != null) str = attString.string();
	}
	if (str == null) error(SWT.ERROR_CANNOT_GET_ITEM);
	return str.getString();
}

/**
 * Returns the number of items contained in the receiver's list.
 *
 * @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 ();
	if ((style & SWT.READ_ONLY) != 0) {
		return (int)/*64*/((NSPopUpButton)view).numberOfItems();
	} else {
		return (int)/*64*/((NSComboBox)view).numberOfItems();
	}
}

/**
 * Returns the height of the area which would be used to
 * display one of the items in the receiver's list.
 *
 * @return the height of one 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 int getItemHeight () {
	checkWidget ();
	//TODO - not supported by the OS
	return 26;
}

/**
 * Returns a (possibly empty) array of Strings which are
 * the items in the receiver's list.
 * 
    
 * 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's list
 *
 * @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 String [] getItems () {
	checkWidget ();
	int count = getItemCount ();
	String [] result = new String [count];
	for (int i=0; itrue     if the receiver's list is visible,
 * and false otherwise.
 * 
    
 * If one of the receiver's ancestors is not visible or some
 * other condition makes the receiver not visible, this method
 * may still indicate that it is considered visible even though
 * it may not actually be showing.
 * 
    
 *
 * @return the receiver's list's visibility 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
      • 
 * 
    
 *
 * @since 3.4
 */
public boolean getListVisible () {
	checkWidget ();
	return listVisible;
}

@Override
String getNameText () {
    return getText ();
}

@Override
int getMininumHeight () {
	return getTextHeight ();
}

/**
 * Returns the orientation of the receiver.
 *
 * @return the orientation style
 *
 * @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
      • 
 * 
    
 *
 * @since 2.1.2
 */
@Override
public int getOrientation () {
	checkWidget();
	return style & (SWT.LEFT_TO_RIGHT | SWT.RIGHT_TO_LEFT);
}

/**
 * Returns a Point whose x coordinate is the
 * character position representing the start of the selection
 * in the receiver's text field, and whose y coordinate is the
 * character position representing the end of the selection.
 * An "empty" selection is indicated by the x and y coordinates
 * having the same value.
 * 
    
 * Indexing is zero based.  The range of a selection is from
 * 0..N where N is the number of characters in the widget.
 * 
    
 *
 * @return a point representing the selection start and end
 *
 * @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 Point getSelection () {
	checkWidget ();
	if ((style & SWT.READ_ONLY) != 0) {
		return new Point (0, getCharCount ());
	} else {
		if (selectionRange == null) {
			NSString str = new NSTextFieldCell (((NSTextField) view).cell ()).title ();
			return new Point((int)/*64*/str.length (), (int)/*64*/str.length ());
		}
		return new Point((int)/*64*/selectionRange.location, (int)/*64*/(selectionRange.location + selectionRange.length));
	}
}

/**
 * Returns the zero-relative index of the item which is currently
 * selected in the receiver's list, or -1 if no item is selected.
 *
 * @return the index of the selected 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 int getSelectionIndex () {
	checkWidget ();
	if ((style & SWT.READ_ONLY) != 0) {
		return (int)/*64*/((NSPopUpButton)view).indexOfSelectedItem();
	} else {
		return (int)/*64*/((NSComboBox)view).indexOfSelectedItem();
	}
}

/**
 * Returns a string containing a copy of the contents of the
 * receiver's text field, or an empty string if there are no
 * contents.
 *
 * @return the receiver's text
 *
 * @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 String getText () {
	checkWidget ();
	return new String (getText(0, -1));
}

char [] getText (int start, int end) {
	NSString str;
	if ((style & SWT.READ_ONLY) != 0) {
		str = ((NSPopUpButton)view).titleOfSelectedItem();
	} else {
		str = new NSCell(((NSComboBox)view).cell()).title();
	}
	if (str == null) return new char[0];
	NSRange range = new NSRange ();
	range.location = start;
	if (end == -1) {
		long /*int*/ length = str.length();
		range.length = length - start;
	} else {
		range.length = end - start;
	}
	char [] buffer= new char [(int)/*64*/range.length];
	str.getCharacters(buffer, range);
	return buffer;
}

/**
 * Returns the height of the receivers's text field.
 *
 * @return the text 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 getTextHeight () {
	checkWidget();
	NSCell cell;
	if ((style & SWT.READ_ONLY) != 0) {
		cell = ((NSPopUpButton)view).cell();
	} else {
		cell = ((NSComboBox)view).cell();
	}
	return (int)cell.cellSize().height;
}

/**
 * Returns the maximum number of characters that the receiver's
 * text field is capable of holding. If this has not been changed
 * by setTextLimit(), it will be the constant
 * Combo.LIMIT.
 *
 * @return the text limit
 *
 * @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 #LIMIT
 */
public int getTextLimit () {
	checkWidget();
    return textLimit;
}

/**
 * Gets the number of items that are visible in the drop
 * down portion of the receiver's list.
 * 
    
 * Note: This operation is a hint and is not supported on
 * platforms that do not have this concept.
 * 
    
 *
 * @return the number of items that are visible
 *
 * @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
      • 
 * 
    
 *
 * @since 3.0
 */
public int getVisibleItemCount () {
	checkWidget ();
	if ((style & SWT.READ_ONLY) != 0) {
		return getItemCount ();
	} else {
		return (int)/*64*/((NSComboBox)view).numberOfVisibleItems();
	}
}

/**
 * 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 string the search item
 * @return the index of the item
 *
 * @exception IllegalArgumentException 
      
 *    
    • ERROR_NULL_ARGUMENT - if the string 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
      • 
 * 
    
 */
public int indexOf (String string) {
	return indexOf (string, 0);
}

/**
 * Searches the receiver's list starting at the given,
 * zero-relative index until an item is found that is equal
 * to the argument, and returns the index of that item. If
 * no item is found or the starting index is out of range,
 * returns -1.
 *
 * @param string the search item
 * @param start the zero-relative index at which to begin the search
 * @return the index of the item
 *
 * @exception IllegalArgumentException 
      
 *    
    • ERROR_NULL_ARGUMENT - if the string 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
      • 
 * 
    
 */
public int indexOf (String string, int start) {
	checkWidget();
	if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
	int count = getItemCount ();
	if (!(0 <= start && start < count)) return -1;
	for (int i=start; i
 * The selected text is deleted from the widget
 * and new text inserted from the clipboard.
 * 
    
 *
 * @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
      • 
 * 
    
 *
 * @since 2.1
 */
public void paste () {
	checkWidget ();
	if ((style & SWT.READ_ONLY) != 0) return;
	Point selection = getSelection ();
	int start = selection.x, end = selection.y;
	String text = getText ();
	String leftText = text.substring (0, start);
	String rightText = text.substring (end, text.length ());
	String newText = getClipboardText ();
	if (newText == null) return;
	if (hooks (SWT.Verify) || filters (SWT.Verify)) {
		newText = verifyText (newText, start, end, null);
		if (newText == null) return;
	}
	if (textLimit != LIMIT) {
		int charCount = text.length ();
		if (charCount - (end - start) + newText.length() > textLimit) {
			newText = newText.substring(0, textLimit - charCount + (end - start));
		}
	}
	setText (leftText + newText + rightText, false);
	start += newText.length ();
	setSelection (new Point (start, start));
	sendEvent (SWT.Modify);
}

@Override
void register() {
	super.register();
	display.addWidget(((NSControl)view).cell(), this);
}

@Override
void releaseWidget () {
	if (display.currentCombo == this) {
		display.currentCombo = null;
	}
	super.releaseWidget ();
	if ((style & SWT.READ_ONLY) == 0) {
		((NSControl)view).abortEditing();
	}
	text = null;
	selectionRange = null;
}

/**
 * Removes the item from the receiver's list at the given
 * zero-relative index.
 *
 * @param index the index for the item
 *
 * @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 void remove (int index) {
	checkWidget ();
	if (index == -1) error (SWT.ERROR_INVALID_RANGE);
	int count = getItemCount ();
	if (0 > index || index >= count) error (SWT.ERROR_INVALID_RANGE);
	if ((style & SWT.READ_ONLY) != 0) {
		((NSPopUpButton)view).removeItemAtIndex(index);
	} else {
		((NSComboBox)view).removeItemAtIndex(index);
	}
}

/**
 * Removes the items from the receiver's list which are
 * between the given zero-relative start and end
 * indices (inclusive).
 *
 * @param start the start of the range
 * @param end the end of the range
 *
 * @exception IllegalArgumentException 
      
 *    
    • ERROR_INVALID_RANGE - if either the start or end are 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 void remove (int start, int end) {
	checkWidget();
	if (start > end) return;
	int count = getItemCount ();
	if (!(0 <= start && start <= end && end < count)) {
		error (SWT.ERROR_INVALID_RANGE);
	}
	int newEnd = Math.min (end, count - 1);
	for (int i=newEnd; i>=start; i--) {
		remove(i);
	}
}

/**
 * Searches the receiver's list starting at the first item
 * until an item is found that is equal to the argument,
 * and removes that item from the list.
 *
 * @param string the item to remove
 *
 * @exception IllegalArgumentException 
      
 *    
    • ERROR_NULL_ARGUMENT - if the string is null
      • 
 *    
    • ERROR_INVALID_ARGUMENT - if the string is not found in the list
      • 
 * 
    
 * @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 remove (String string) {
	checkWidget ();
	if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
	int index = indexOf (string, 0);
	if (index == -1) error (SWT.ERROR_INVALID_ARGUMENT);
	remove (index);
}

/**
 * Removes all of the items from the receiver's list and clear the
 * contents of receiver's text field.
 * 
    
 * @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 removeAll () {
	checkWidget ();
	ignoreSelection = true;
	if ((style & SWT.READ_ONLY) != 0) {
		((NSPopUpButton)view).removeAllItems();
	} else {
		setText ("", true);
		((NSComboBox)view).removeAllItems();
	}
	ignoreSelection = false;
}

/**
 * Removes the listener from the collection of listeners who will
 * be notified when the receiver's text is modified.
 *
 * @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 ModifyListener
 * @see #addModifyListener
 */
public void removeModifyListener (ModifyListener listener) {
	checkWidget();
	if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
	if (eventTable == null) return;
	eventTable.unhook (SWT.Modify, listener);
}

/**
 * Removes the listener from the collection of listeners who will
 * be notified when the receiver's text is modified.
 *
 * @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 SegmentEvent
 * @see SegmentListener
 * @see #addSegmentListener
 *
 * @since 3.103
 */
public void removeSegmentListener (SegmentListener listener) {
	checkWidget ();
	if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
	eventTable.unhook (SWT.Segments, listener);
}

/**
 * Removes the listener from the collection of listeners who will
 * be notified when the user changes the receiver's selection.
 *
 * @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 SelectionListener
 * @see #addSelectionListener
 */
public void removeSelectionListener (SelectionListener listener) {
	checkWidget();
	if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
	if (eventTable == null) return;
	eventTable.unhook (SWT.Selection, listener);
	eventTable.unhook (SWT.DefaultSelection,listener);
}

/**
 * Removes the listener from the collection of listeners who will
 * be notified when the control is verified.
 *
 * @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 VerifyListener
 * @see #addVerifyListener
 *
 * @since 3.1
 */
public void removeVerifyListener (VerifyListener listener) {
	checkWidget();
	if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
	if (eventTable == null) return;
	eventTable.unhook (SWT.Verify, listener);
}

/**
 * Selects the item at the given zero-relative index in the receiver's
 * list.  If the item at the index was already selected, it remains
 * selected. Indices that are out of range are ignored.
 *
 * @param index the index of the item to select
 *
 * @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 select (int index) {
	checkWidget ();
	int count = getItemCount ();
	if (0 <= index && index < count) {
		if (index == getSelectionIndex()) return;
		ignoreSelection = true;
		if ((style & SWT.READ_ONLY) != 0) {
			((NSPopUpButton)view).selectItemAtIndex(index);
			sendEvent (SWT.Modify);
		} else {
			NSComboBox widget = (NSComboBox)view;
			widget.deselectItemAtIndex(index);
			widget.selectItemAtIndex(index);
		}
		ignoreSelection = false;
	}
}

@Override
void sendSelection () {
	sendEvent(SWT.Modify);
	if (!ignoreSelection) sendSelectionEvent(SWT.Selection);
}

@Override
boolean sendKeyEvent (NSEvent nsEvent, int type) {
	boolean result = super.sendKeyEvent (nsEvent, type);
	if (!result) return result;
	int stateMask = 0;
	long /*int*/ modifierFlags = nsEvent.modifierFlags();
	if ((modifierFlags & OS.NSAlternateKeyMask) != 0) stateMask |= SWT.ALT;
	if ((modifierFlags & OS.NSShiftKeyMask) != 0) stateMask |= SWT.SHIFT;
	if ((modifierFlags & OS.NSControlKeyMask) != 0) stateMask |= SWT.CONTROL;
	if ((modifierFlags & OS.NSCommandKeyMask) != 0) stateMask |= SWT.COMMAND;
	if (type != SWT.KeyDown)  return result;
	short keyCode = nsEvent.keyCode ();
	if (stateMask == SWT.COMMAND) {
		switch (keyCode) {
			case 7: /* X */
				cut ();
				return false;
			case 8: /* C */
				copy ();
				return false;
			case 9: /* V */
				paste ();
				return false;
			case 0: /* A */
				if ((style & SWT.READ_ONLY) == 0) {
					((NSComboBox)view).selectText(null);
					return false;
				}
		}
	}
	switch (keyCode) {
	case 76: /* KP Enter */
	case 36: /* Return */
		sendSelectionEvent (SWT.DefaultSelection);
	}
	return result;
}

boolean sendTrackingKeyEvent (NSEvent nsEvent, int type) {
	/*
	* Feature in Cocoa.  Combo does not send arrow down/up
	* key down events while the list is showing.  The fix is
	* to send these events when the event is removed from the
	* queue.
	*/
	long /*int*/ modifiers = nsEvent.modifierFlags();
	if ((modifiers & OS.NSShiftKeyMask) == 0) {
		short keyCode = nsEvent.keyCode ();
		switch (keyCode) {
			case 125: /* Arrow Down */
			case 126: /* Arrow Up */
				sendKeyEvent(nsEvent, type);
				return true;
		}
	}
	return false;
}

@Override
void setBackgroundColor(NSColor nsColor) {
	if ((style & SWT.READ_ONLY) != 0) {
		//TODO
	} else {
		((NSTextField)view).setBackgroundColor(nsColor);
	}
}

@Override
void setBackgroundImage(NSImage image) {
	//TODO setDrawsBackground is ignored by NSComboBox?
}

@Override
void setBounds (int x, int y, int width, int height, boolean move, boolean resize) {
	/*
	 * Feature in Cocoa.  Attempting to create an NSComboBox with a
	 * height > 27 spews a very long warning message to stdout and
	 * often draws the combo incorrectly.
	 * The workaround is to limit the height of editable Combos to the
	 * height that is required to display their text. For multiline text,
	 * limit the height to frame height.
	 */
	if ((style & SWT.READ_ONLY) == 0) {
		NSControl widget = (NSControl)view;
		int hLimit = 0;
		NSString nsStr = widget.stringValue();
		if (nsStr != null ){
			String str = nsStr.getString();
			if (str != null && (str.indexOf('\n') >= 0 || str.indexOf('\r') >= 0)) {
				int frameHeight = (int) view.frame().height;
				if (frameHeight > 0) {
					hLimit = frameHeight;
				}
			}
		}
		if (hLimit == 0) {
			NSSize size = widget.cell ().cellSize ();
			hLimit = (int)Math.ceil (size.height);
		}
		height = Math.min (height, hLimit);
	}
	super.setBounds (x, y, width, height, move, resize);
}

@Override
void setFont (NSFont font) {
	super.setFont(font);
	updateItems();
}

@Override
void setForeground (double /*float*/ [] color) {
	super.setForeground(color);
	updateItems();
	if ((style & SWT.READ_ONLY) == 0) {
		NSColor nsColor;
		if (color == null) {
			nsColor = NSColor.textColor ();
		} else {
			nsColor = NSColor.colorWithDeviceRed(color[0], color[1], color[2], 1);
		}
		((NSTextField)view).setTextColor(nsColor);
	}
}

/**
 * Sets the text of the item in the receiver's list at the given
 * zero-relative index to the string argument.
 *
 * @param index the index for the item
 * @param string the new text for the item
 *
 * @exception IllegalArgumentException 
      
 *    
    • ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)
      • 
 *    
    • ERROR_NULL_ARGUMENT - if the string 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
      • 
 * 
    
 */
public void setItem (int index, String string) {
	checkWidget ();
	if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
	int count = getItemCount ();
	if (0 > index || index >= count) error (SWT.ERROR_INVALID_RANGE);
	int selection = getSelectionIndex();
	NSAttributedString str = createString(string);
	ignoreSelection = true;
	if ((style & SWT.READ_ONLY) != 0) {
		NSMenuItem nsItem = ((NSPopUpButton)view).itemAtIndex(index);
		nsItem.setAttributedTitle(str);
		/*
		 * Feature in Cocoa.  Setting the attributed title on an NSMenuItem
		 * also sets the title, but clearing the attributed title does not
		 * clear the title.  The fix is to explicitly set the title to an
		 * empty string in this case.
		 */
		if (string.length() == 0) nsItem.setTitle(NSString.string());
	} else {
		NSComboBox widget = (NSComboBox)view;
		widget.insertItemWithObjectValue(str, index);
		widget.removeItemAtIndex(index + 1);
	}
	if (selection != -1) select (selection);
	ignoreSelection = false;
}

/**
 * Sets the receiver's list to be the given array of items.
 *
 * @param items the array of items
 *
 * @exception IllegalArgumentException 
      
 *    
    • ERROR_NULL_ARGUMENT - if the items array is null
      • 
 *    
    • ERROR_INVALID_ARGUMENT - if an item in the items array 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
      • 
 * 
    
 */
public void setItems (String... items) {
	checkWidget();
	if (items == null) error (SWT.ERROR_NULL_ARGUMENT);
	for (int i=0; itrue,
 * and marks it invisible otherwise.
 * 
    
 * If one of the receiver's ancestors is not visible or some
 * other condition makes the receiver not visible, marking
 * it visible may not actually cause it to be displayed.
 * 
    
 *
 * @param visible the new visibility 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
      • 
 * 
    
 *
 * @since 3.4
 */
public void setListVisible (boolean visible) {
	checkWidget ();
	if ((style & SWT.READ_ONLY) != 0) {
		((NSPopUpButton)view).setPullsDown(visible);
	} else {
	}
}

/**
 * Sets the orientation of the receiver, which must be one
 * of the constants SWT.LEFT_TO_RIGHT or SWT.RIGHT_TO_LEFT.
 * 
    
 *
 * @param orientation new orientation style
 *
 * @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
      • 
 * 
    
 *
 * @since 2.1.2
 */
@Override
public void setOrientation (int orientation) {
	checkWidget();
}

@Override
void setOrientation () {
	int direction = (style & SWT.RIGHT_TO_LEFT) != 0 ? OS.NSWritingDirectionRightToLeft : OS.NSWritingDirectionLeftToRight;
	((NSControl)view).setBaseWritingDirection(direction);
}

/**
 * Sets the selection in the receiver's text field to the
 * range specified by the argument whose x coordinate is the
 * start of the selection and whose y coordinate is the end
 * of the selection.
 *
 * @param selection a point representing the new selection start and end
 *
 * @exception IllegalArgumentException 
      
 *    
    • ERROR_NULL_ARGUMENT - if the point 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
      • 
 * 
    
 */
public void setSelection (Point selection) {
	checkWidget ();
	if (selection == null) error (SWT.ERROR_NULL_ARGUMENT);
	if ((style & SWT.READ_ONLY) == 0) {
		NSComboBox widget = (NSComboBox)view;
		NSString str = new NSCell(widget.cell()).title();
		int length = (int)/*64*/str.length();
		int start = Math.min (Math.max (Math.min (selection.x, selection.y), 0), length);
		int end = Math.min (Math.max (Math.max (selection.x, selection.y), 0), length);
		selectionRange = new NSRange();
		selectionRange.location = start;
		selectionRange.length = end - start;
		NSText fieldEditor = widget.currentEditor();
		if (fieldEditor != null) fieldEditor.setSelectedRange(selectionRange);
	}
}

/**
 * Sets the contents of the receiver's text field to the
 * given string.
 * 
    
 * This call is ignored when the receiver is read only and
 * the given string is not in the receiver's list.
 * 
    
 * 
    
 * Note: The text field in a Combo is typically
 * only capable of displaying a single line of text. Thus,
 * setting the text to a string containing line breaks or
 * other special characters will probably cause it to
 * display incorrectly.
 * 
    
 * Also note, if control characters like '\n', '\t' etc. are used
 * in the string, then the behavior is platform dependent.
 * 
    
 *
 * @param string the new text
 *
 * @exception IllegalArgumentException 
      
 *    
    • ERROR_NULL_ARGUMENT - if the string 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
      • 
 * 
    
 */
public void setText (String string) {
	checkWidget ();
	if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
	setText (string, true);
}

void setText (String string, boolean notify) {
	if (notify) {
		if (hooks (SWT.Verify) || filters (SWT.Verify)) {
			string = verifyText (string, 0, getCharCount (), null);
			if (string == null) return;
		}
	}
	if ((style & SWT.READ_ONLY) != 0) {
		int index = indexOf (string);
		if (index != -1) {
			select (index);
		}
	} else {
		char[] buffer = new char [Math.min(string.length (), textLimit)];
		string.getChars (0, buffer.length, buffer, 0);
		text = new String (buffer,0, buffer.length);
		((NSComboBox)view).cell().setAttributedStringValue(createString(text));
		if (notify) sendEvent (SWT.Modify);
	}
	selectionRange = null;
}

/**
 * Sets the maximum number of characters that the receiver's
 * text field is capable of holding to be the argument.
 * 
    
 * To reset this value to the default, use setTextLimit(Combo.LIMIT).
 * Specifying a limit value larger than Combo.LIMIT sets the
 * receiver's limit to Combo.LIMIT.
 * 
    
 * @param limit new text limit
 *
 * @exception IllegalArgumentException 
      
 *    
    • ERROR_CANNOT_BE_ZERO - if the limit is zero
      • 
 * 
    
 * @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 #LIMIT
 */
public void setTextLimit (int limit) {
	checkWidget ();
	if (limit == 0) error (SWT.ERROR_CANNOT_BE_ZERO);
	textLimit = limit;
}

/**
 * Sets the number of items that are visible in the drop
 * down portion of the receiver's list.
 * 
    
 * Note: This operation is a hint and is not supported on
 * platforms that do not have this concept.
 * 
    
 *
 * @param count the new number of items to be visible
 *
 * @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
      • 
 * 
    
 *
 * @since 3.0
 */
public void setVisibleItemCount (int count) {
	checkWidget ();
	if (count < 0) return;
	if ((style & SWT.READ_ONLY) != 0) {
		//TODO
	} else {
		((NSComboBox)view).setNumberOfVisibleItems(count);
	}
}

@Override
boolean shouldChangeTextInRange_replacementString(long /*int*/ id, long /*int*/ sel, long /*int*/ affectedCharRange, long /*int*/ replacementString) {
	NSRange range = new NSRange();
	OS.memmove(range, affectedCharRange, NSRange.sizeof);
	boolean result = callSuperBoolean(id, sel, range, replacementString);
	if (hooks (SWT.Verify)) {
		String string = new NSString(replacementString).getString();
		NSEvent currentEvent = display.application.currentEvent();
		long /*int*/ type = currentEvent.type();
		if (type != OS.NSKeyDown && type != OS.NSKeyUp) currentEvent = null;
		String newText = verifyText(string, (int)/*64*/range.location, (int)/*64*/(range.location+range.length), currentEvent);
		if (newText == null) return false;
		if (!string.equals(newText)) {
			int length = newText.length();
			Point selection = getSelection();
			if (textLimit != LIMIT) {
				int charCount = getCharCount();
				if (charCount - (selection.y - selection.x) + length > textLimit) {
					length = textLimit - charCount + (selection.y - selection.x);
				}
			}
			char [] buffer = new char [length];
			newText.getChars (0, buffer.length, buffer, 0);
			NSString nsstring = NSString.stringWithCharacters (buffer, buffer.length);
			NSText fieldEditor = ((NSTextField) view).currentEditor ();
			fieldEditor.replaceCharactersInRange (fieldEditor.selectedRange (), nsstring);
			text = fieldEditor.string().getString();
			sendEvent (SWT.Modify);
			result = false;
		}
	}
	if (result) {
		char[] chars = new char[text.length()];
		text.getChars(0, chars.length, chars, 0);
		NSMutableString mutable = (NSMutableString) NSMutableString.stringWithCharacters(chars, chars.length);
		mutable.replaceCharactersInRange(range, new NSString(replacementString));
		text = mutable.getString();
		selectionRange = null;
	}
	return result;
}

@Override
void textViewDidChangeSelection(long /*int*/ id, long /*int*/ sel, long /*int*/ aNotification) {
	NSNotification notification = new NSNotification(aNotification);
	NSText editor = new NSText(notification.object().id);
	selectionRange = editor.selectedRange();
}

@Override
void textDidChange (long /*int*/ id, long /*int*/ sel, long /*int*/ aNotification) {
	super.textDidChange (id, sel, aNotification);
	postEvent (SWT.Modify);
}

@Override
NSRange textView_willChangeSelectionFromCharacterRange_toCharacterRange(long /*int*/ id, long /*int*/ sel, long /*int*/ aTextView, long /*int*/ oldSelectedCharRange, long /*int*/ newSelectedCharRange) {
	/*
	* If the selection is changing as a result of the receiver getting focus
	* then return the receiver's last selection range, otherwise the full
	* text will be automatically selected.
	*/
	if (receivingFocus && selectionRange != null) return selectionRange;

	/* allow the selection change to proceed */
	NSRange result = new NSRange();
	OS.memmove(result, newSelectedCharRange, NSRange.sizeof);
	return result;
}

void updateItems () {
	if ((style & SWT.READ_ONLY) != 0) {
		NSPopUpButton widget = (NSPopUpButton)view;
		int count = (int)/*64*/ widget.numberOfItems();
		for (int i = 0; i < count; i++) {
			NSMenuItem item = new NSMenuItem (widget.itemAtIndex(i));
			NSAttributedString attStr = item.attributedTitle();
			String string = attStr.string().getString();
			item.setAttributedTitle(createString(string));
		}
	} else {
		NSComboBox widget = (NSComboBox)view;
		int count = (int)/*64*/ widget.numberOfItems();
		for (int i = 0; i < count; i++) {
			NSAttributedString attStr = new NSAttributedString (widget.itemObjectValueAtIndex(i));
			String string = attStr.string().getString();
			widget.insertItemWithObjectValue(createString(string), i);
			widget.removeItemAtIndex(i + 1);
		}
		widget.cell().setAttributedStringValue(createString(text));
	}
}

String verifyText (String string, int start, int end, NSEvent keyEvent) {
	Event event = new Event ();
	if (keyEvent != null) setKeyState(event, SWT.MouseDown, keyEvent);
	event.text = string;
	event.start = start;
	event.end = end;
	/*
	 * It is possible (but unlikely), that application
	 * code could have disposed the widget in the verify
	 * event.  If this happens, answer null to cancel
	 * the operation.
	 */
	sendEvent (SWT.Verify, event);
	if (!event.doit || isDisposed ()) return null;
	return event.text;
}

}




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