--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwt/widgets/Combo.d	Sat Aug 09 17:00:02 2008 +0200
@@ -0,0 +1,1387 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2007 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
+ *******************************************************************************/
+module dwt.widgets.Combo;
+
+import dwt.dwthelper.utils;
+
+
+import dwt.DWT;
+import dwt.DWTException;
+import dwt.events.ModifyListener;
+import dwt.events.SelectionEvent;
+import dwt.events.SelectionListener;
+import dwt.events.VerifyListener;
+import dwt.graphics.Color;
+import dwt.graphics.Point;
+import dwt.internal.cocoa.NSCell;
+import dwt.internal.cocoa.NSColor;
+import dwt.internal.cocoa.NSComboBox;
+import dwt.internal.cocoa.NSControl;
+import dwt.internal.cocoa.NSMenu;
+import dwt.internal.cocoa.NSMenuItem;
+import dwt.internal.cocoa.NSPopUpButton;
+import dwt.internal.cocoa.NSRect;
+import dwt.internal.cocoa.NSString;
+import dwt.internal.cocoa.NSTextField;
+import dwt.internal.cocoa.OS;
+import dwt.internal.cocoa.SWTComboBox;
+import dwt.internal.cocoa.SWTPopUpButton;
+
+/**
+ * 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, <code>Combo</code>s are used in the same place
+ * where a single selection <code>List</code> widget could
+ * be used but space is limited. A <code>Combo</code> takes
+ * less space than a <code>List</code> widget and shows
+ * similar information.
+ * <p>
+ * Note: Since <code>Combo</code>s 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,
+ * <code>clearSelection()</code> and <code>deselectAll()</code>).
+ * 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.
+ * </p><p>
+ * Note that although this class is a subclass of <code>Composite</code>,
+ * it does not make sense to add children to it, or set a layout on it.
+ * </p>
+ * <dl>
+ * <dt><b>Styles:</b></dt>
+ * <dd>DROP_DOWN, READ_ONLY, SIMPLE</dd>
+ * <dt><b>Events:</b></dt>
+ * <dd>DefaultSelection, Modify, Selection, Verify</dd>
+ * </dl>
+ * <p>
+ * Note: Only one of the styles DROP_DOWN and SIMPLE may be specified.
+ * </p><p>
+ * IMPORTANT: This class is <em>not</em> intended to be subclassed.
+ * </p>
+ *
+ * @see List
+ */
+public class Combo extends Composite {
+    int textLimit = LIMIT;
+
+    /**
+     * 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.
+ * <p>
+ * The style value is either one of the style constants defined in
+ * class <code>DWT</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>DWT</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 composite control which will be the parent of the new instance (cannot be null)
+ * @param style the style of control to construct
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
+ * </ul>
+ * @exception DWTException <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 DWT#DROP_DOWN
+ * @see DWT#READ_ONLY
+ * @see DWT#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.
+ *
+ * @param string the new item
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the string is null</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see #add(String,int)
+ */
+public void add (String string) {
+    checkWidget ();
+    if (string is null) error (DWT.ERROR_NULL_ARGUMENT);
+    NSString str = NSString.stringWith(string);
+    if ((style & DWT.READ_ONLY) !is 0) {
+        NSMenu nsMenu = ((NSPopUpButton)view).menu();
+        NSMenuItem nsItem = (NSMenuItem)new NSMenuItem().alloc();
+        nsItem.initWithTitle(str, 0, NSString.stringWith(""));
+        nsMenu.addItem(nsItem);
+        nsItem.release();
+    } else {
+        ((NSComboBox)view).addItemWithObjectValue(str);
+    }
+}
+
+/**
+ * Adds the argument to the receiver's list at the given
+ * zero-relative index.
+ * <p>
+ * Note: To add an item at the end of the list, use the
+ * result of calling <code>getItemCount()</code> as the
+ * index or use <code>add(String)</code>.
+ * </p>
+ *
+ * @param string the new item
+ * @param index the index for the item
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the string is null</li>
+ *    <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list (inclusive)</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see #add(String)
+ */
+public void add (String string, int index) {
+    checkWidget ();
+    if (string is null) error (DWT.ERROR_NULL_ARGUMENT);
+    int count = getItemCount ();
+    if (0 > index || index > count) error (DWT.ERROR_INVALID_RANGE);
+    NSString str = NSString.stringWith(string);
+    if ((style & DWT.READ_ONLY) !is 0) {
+        NSMenu nsMenu = ((NSPopUpButton)view).menu();
+        NSMenuItem nsItem = (NSMenuItem)new NSMenuItem().alloc();
+        nsItem.initWithTitle(str, 0, NSString.stringWith(""));
+        nsMenu.insertItem(nsItem, index);
+        nsItem.release();
+    } 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 <code>ModifyListener</code>
+ * interface.
+ *
+ * @param listener the listener which should be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see ModifyListener
+ * @see #removeModifyListener
+ */
+public void addModifyListener (ModifyListener listener) {
+    checkWidget();
+    if (listener is null) error (DWT.ERROR_NULL_ARGUMENT);
+    TypedListener typedListener = new TypedListener (listener);
+    addListener (DWT.Modify, typedListener);
+}
+
+/**
+ * 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 <code>SelectionListener</code>
+ * interface.
+ * <p>
+ * <code>widgetSelected</code> is called when the user changes the combo's list selection.
+ * <code>widgetDefaultSelected</code> is typically called when ENTER is pressed the combo's text area.
+ * </p>
+ *
+ * @param listener the listener which should be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see SelectionListener
+ * @see #removeSelectionListener
+ * @see SelectionEvent
+ */
+public void addSelectionListener(SelectionListener listener) {
+    checkWidget();
+    if (listener is null) error (DWT.ERROR_NULL_ARGUMENT);
+    TypedListener typedListener = new TypedListener (listener);
+    addListener (DWT.Selection,typedListener);
+    addListener (DWT.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 <code>VerifyListener</code>
+ * interface.
+ *
+ * @param listener the listener which should be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see VerifyListener
+ * @see #removeVerifyListener
+ * 
+ * @since 3.1
+ */
+public void addVerifyListener (VerifyListener listener) {
+    checkWidget();
+    if (listener is null) error (DWT.ERROR_NULL_ARGUMENT);
+    TypedListener typedListener = new TypedListener (listener);
+    addListener (DWT.Verify, typedListener);
+}
+
+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 DWT style will
+    * match the Windows widget.
+    *
+    * The Windows behavior is currently implemented on
+    * all platforms.
+    */
+    style &= ~DWT.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 DWT style.
+    */
+    style &= ~(DWT.H_SCROLL | DWT.V_SCROLL);
+    style = checkBits (style, DWT.DROP_DOWN, DWT.SIMPLE, 0, 0, 0, 0);
+    if ((style & DWT.SIMPLE) !is 0) return style & ~DWT.READ_ONLY;
+    return style;
+}
+
+protected void checkSubclass () {
+    if (!isValidSubclass ()) error (DWT.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.
+ * <p>
+ * Note: To clear the selected items in the receiver's list, 
+ * use <code>deselectAll()</code>.
+ * </p>
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see #deselectAll
+ */
+public void clearSelection () {
+    checkWidget();
+    if ((style & DWT.READ_ONLY) is 0) {
+        Point selection = getSelection ();
+        selection.y = selection.x;
+        setSelection (selection);
+    }
+}
+
+void comboBoxSelectionDidChange(int notification) {
+    sendSelection();
+}
+
+public Point computeSize (int wHint, int hHint, bool changed) {
+    checkWidget ();
+    int width = 0, height = 0;
+    NSControl widget = (NSControl)view;
+    NSRect oldRect = widget.frame();
+    widget.sizeToFit();
+    NSRect newRect = widget.frame();
+    widget.setFrame (oldRect);
+    width = (int)newRect.width;
+    height = (int)newRect.height;
+    if (wHint !is DWT.DEFAULT) width = wHint;
+    if (hHint !is DWT.DEFAULT) height = hHint;
+    return new Point (width, height);
+}
+
+/**
+ * Copies the selected text.
+ * <p>
+ * The current selection is copied to the clipboard.
+ * </p>
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ * 
+ * @since 2.1
+ */
+public void copy () {
+    checkWidget ();
+    Point selection = getSelection ();
+    if (selection.x is selection.y) return;
+//  copyToClipboard (getText (selection.x, selection.y));
+}
+
+void createHandle () {
+    if ((style & DWT.READ_ONLY) !is 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.setTag(jniRef);
+        view = widget;
+        parent.view.addSubview_(widget);
+    } else {
+        NSComboBox widget = (NSComboBox)new SWTComboBox().alloc();
+        widget.initWithFrame(new NSRect());
+        widget.setTag(jniRef);
+        widget.setDelegate(widget);
+        view = widget;
+        parent.contentView().addSubview_(widget);
+    }
+}
+
+/**
+ * Cuts the selected text.
+ * <p>
+ * The current selection is first copied to the
+ * clipboard and then deleted from the widget.
+ * </p>
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ * 
+ * @since 2.1
+ */
+public void cut () {
+    checkWidget ();
+    if ((style & DWT.READ_ONLY) !is 0) return;
+//  Point selection = getSelection ();
+//  if (selection.x is 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 (DWT.Verify) || filters (DWT.Verify)) {
+//      newText = verifyText (newText, start, end, null);
+//      if (newText is 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 (DWT.Modify);
+}
+
+Color defaultBackground () {
+    return display.getSystemColor (DWT.COLOR_LIST_BACKGROUND);
+}
+
+Color defaultForeground () {
+    return display.getSystemColor (DWT.COLOR_LIST_FOREGROUND);
+}
+
+/**
+ * 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 DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void deselect (int index) {
+    checkWidget ();
+    if (index is -1) return;
+    if (index is getSelectionIndex ()) {
+        if ((style & DWT.READ_ONLY) !is 0) {
+            ((NSPopUpButton)view).selectItem(null);
+            sendEvent (DWT.Modify);
+        } else {
+            ((NSComboBox)view).deselectItemAtIndex(index);
+        }
+    }
+}
+
+/**
+ * Deselects all selected items in the receiver's list.
+ * <p>
+ * Note: To clear the selection in the receiver's text field,
+ * use <code>clearSelection()</code>.
+ * </p>
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see #clearSelection
+ */
+public void deselectAll () {
+    checkWidget ();
+    if ((style & DWT.READ_ONLY) !is 0) {
+        ((NSPopUpButton)view).selectItem(null);
+        sendEvent (DWT.Modify);
+    } else {
+        setText ("");
+    }
+}
+
+int getCharCount() {
+    NSString str;
+    if ((style & DWT.READ_ONLY) !is 0) {
+        str = ((NSPopUpButton)view).titleOfSelectedItem();
+    } else {
+        str = new NSCell(((NSComboBox)view).cell()).title();
+    }
+    return 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 <ul>
+ *    <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public String getItem (int index) {
+    checkWidget ();
+    int count = getItemCount ();
+    if (0 > index || index >= count) error (DWT.ERROR_INVALID_RANGE);
+    NSString str;
+    if ((style & DWT.READ_ONLY) !is 0) {
+        str = ((NSPopUpButton)view).itemTitleAtIndex(index);
+    } else {
+        str = new NSString(((NSComboBox)view).itemObjectValueAtIndex(index));
+    }
+    if (str is null) error(DWT.ERROR_CANNOT_GET_ITEM);
+    char[] buffer = new char[str.length()];
+    str.getCharacters_(buffer);
+    return new String (buffer);
+}
+
+/**
+ * Returns the number of items contained in the receiver's list.
+ *
+ * @return the number of items
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public int getItemCount () {
+    checkWidget ();
+    if ((style & DWT.READ_ONLY) !is 0) {
+        return ((NSPopUpButton)view).numberOfItems();
+    } else {
+        return ((NSComboBox)view).numberOfItems();
+    }
+}
+
+/**
+ * Returns the height of the area which would be used to
+ * display <em>one</em> of the items in the receiver's list.
+ *
+ * @return the height of one item
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public int getItemHeight () {
+    checkWidget ();
+    //TODO - not supported by the OS
+    return 26;
+}
+
+/**
+ * Returns a (possibly empty) array of <code>String</code>s which are
+ * the items in the receiver's list. 
+ * <p>
+ * 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. 
+ * </p>
+ *
+ * @return the items in the receiver's list
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public String [] getItems () {
+    checkWidget ();
+    int count = getItemCount ();
+    String [] result = new String [count];
+    for (int i=0; i<count; i++) result [i] = getItem (i);
+    return result;
+}
+
+int getMininumHeight () {
+    return getTextHeight ();
+}
+
+/**
+ * Returns the orientation of the receiver.
+ *
+ * @return the orientation style
+ * 
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ * 
+ * @since 2.1.2
+ */
+public int getOrientation () {
+    checkWidget();
+    return style & (DWT.LEFT_TO_RIGHT | DWT.RIGHT_TO_LEFT);
+}
+
+/**
+ * Returns a <code>Point</code> 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.
+ * <p>
+ * Indexing is zero based.  The range of a selection is from
+ * 0..N where N is the number of characters in the widget.
+ * </p>
+ *
+ * @return a point representing the selection start and end
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public Point getSelection () {
+    checkWidget ();
+    if ((style & DWT.READ_ONLY) !is 0) {
+        return new Point (0, getCharCount ());
+    } else {
+//      ControlEditTextSelectionRec selection;
+//      if (this.selection !is null) {
+//          selection = this.selection;
+//      } else {
+//          selection = new ControlEditTextSelectionRec ();
+//          OS.GetControlData (handle, (short) OS.kHIComboBoxEditTextPart, OS.kControlEditTextSelectionTag, 4, selection, null);
+//      }
+//      return new Point (selection.selStart, selection.selEnd);
+        return null;
+    }
+}
+
+/**
+ * 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 DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public int getSelectionIndex () {
+    checkWidget ();
+    if ((style & DWT.READ_ONLY) !is 0) {
+        return ((NSPopUpButton)view).indexOfSelectedItem();
+    } else {
+        return ((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 DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public String getText () {
+    checkWidget ();
+    return getText(0, -1);
+}
+
+String getText (int start, int end) {
+    NSString str;
+    if ((style & DWT.READ_ONLY) !is 0) {
+        str = ((NSPopUpButton)view).titleOfSelectedItem();
+    } else {
+        str = new NSCell(((NSComboBox)view).cell()).title();
+    }
+    if (str is null) return "";
+    int length = str.length();
+    char[] buffer = new char[length];
+    str.getCharacters_(buffer);
+    String string = new String(buffer);
+    if (end is -1) end = length;
+    start = Math.max(0, Math.min(start, length));
+    end = Math.max(0, Math.min(end, length));
+    return string.substring(start, end);
+}
+
+/**
+ * Returns the height of the receivers's text field.
+ *
+ * @return the text height
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public int getTextHeight () {
+    checkWidget();
+    //TODO - not supported by the OS
+    return 26;
+}
+
+/**
+ * Returns the maximum number of characters that the receiver's
+ * text field is capable of holding. If this has not been changed
+ * by <code>setTextLimit()</code>, it will be the constant
+ * <code>Combo.LIMIT</code>.
+ * 
+ * @return the text limit
+ * 
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @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.
+ * <p>
+ * Note: This operation is a hint and is not supported on
+ * platforms that do not have this concept.
+ * </p>
+ *
+ * @return the number of items that are visible
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ * 
+ * @since 3.0
+ */
+public int getVisibleItemCount () {
+    checkWidget ();
+    if ((style & DWT.READ_ONLY) !is 0) {
+        return getItemCount ();
+    } else {
+        return ((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 <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the string is null</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+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 <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the string is null</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public int indexOf (String string, int start) {
+    checkWidget();
+    if (string is null) error (DWT.ERROR_NULL_ARGUMENT);
+    int count = getItemCount ();
+    if (!(0 <= start && start < count)) return -1;
+    for (int i=start; i<count; i++) {
+        if (string.equals (getItem (i))) {
+            return i;
+        }
+    }
+    return -1;
+}
+
+/**
+ * Pastes text from clipboard.
+ * <p>
+ * The selected text is deleted from the widget
+ * and new text inserted from the clipboard.
+ * </p>
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ * 
+ * @since 2.1
+ */
+public void paste () {
+    checkWidget ();
+    if ((style & DWT.READ_ONLY) !is 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 (hooks (DWT.Verify) || filters (DWT.Verify)) {
+//      newText = verifyText (newText, start, end, null);
+//      if (newText is null) return;
+//  }
+//  if (textLimit !is 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 (DWT.Modify);
+}
+
+/**
+ * Removes the item from the receiver's list at the given
+ * zero-relative index.
+ *
+ * @param index the index for the item
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void remove (int index) {
+    checkWidget ();
+    if (index is -1) error (DWT.ERROR_INVALID_RANGE);
+    int count = getItemCount ();
+    if (0 > index || index >= count) error (DWT.ERROR_INVALID_RANGE);
+    if ((style & DWT.READ_ONLY) !is 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 <ul>
+ *    <li>ERROR_INVALID_RANGE - if either the start or end are not between 0 and the number of elements in the list minus 1 (inclusive)</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void remove (int start, int end) {
+    checkWidget();
+    if (start > end) return;
+    int count = getItemCount ();
+    if (!(0 <= start && start <= end && end < count)) {
+        error (DWT.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 <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the string is null</li>
+ *    <li>ERROR_INVALID_ARGUMENT - if the string is not found in the list</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void remove (String string) {
+    checkWidget ();
+    if (string is null) error (DWT.ERROR_NULL_ARGUMENT);
+    int index = indexOf (string, 0);
+    if (index is -1) error (DWT.ERROR_INVALID_ARGUMENT);
+    remove (index);
+}
+
+/**
+ * Removes all of the items from the receiver's list and clear the
+ * contents of receiver's text field.
+ * <p>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void removeAll () {
+    checkWidget ();
+    if ((style & DWT.READ_ONLY) !is 0) {
+        ((NSPopUpButton)view).removeAllItems();
+    } else {
+        setText ("", true);
+        ((NSComboBox)view).removeAllItems();
+    }
+}
+
+/**
+ * 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 <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see ModifyListener
+ * @see #addModifyListener
+ */
+public void removeModifyListener (ModifyListener listener) {
+    checkWidget();
+    if (listener is null) error (DWT.ERROR_NULL_ARGUMENT);
+    if (eventTable is null) return;
+    eventTable.unhook (DWT.Modify, 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 <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see SelectionListener
+ * @see #addSelectionListener
+ */
+public void removeSelectionListener (SelectionListener listener) {
+    checkWidget();
+    if (listener is null) error (DWT.ERROR_NULL_ARGUMENT);
+    if (eventTable is null) return;
+    eventTable.unhook (DWT.Selection, listener);
+    eventTable.unhook (DWT.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 <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see VerifyListener
+ * @see #addVerifyListener
+ * 
+ * @since 3.1
+ */
+public void removeVerifyListener (VerifyListener listener) {
+    checkWidget();
+    if (listener is null) error (DWT.ERROR_NULL_ARGUMENT);
+    if (eventTable is null) return;
+    eventTable.unhook (DWT.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 DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void select (int index) {
+    checkWidget ();
+    int count = getItemCount ();
+    if (0 <= index && index < count) {
+        if ((style & DWT.READ_ONLY) !is 0) {
+            ((NSPopUpButton)view).selectItemAtIndex(index);
+            sendEvent (DWT.Modify);
+        } else {
+            ((NSComboBox)view).selectItemAtIndex(index);
+        }
+    }   
+}
+
+//bool sendKeyEvent (int type, Event event) {
+//  if (!super.sendKeyEvent (type, event)) {
+//      return false;
+//  }
+//  if (type !is DWT.KeyDown) return true;
+//  if ((style & DWT.READ_ONLY) !is 0) return true;
+//  if (event.character is 0) return true;
+//  if ((event.stateMask & DWT.COMMAND) !is 0) return true;
+//  String oldText = "", newText = "";
+//  if (hooks (DWT.Verify) || filters (DWT.Verify)) {
+//      int charCount = getCharCount ();
+//      Point selection = getSelection ();
+//      int start = selection.x, end = selection.y;
+//      switch (event.character) {
+//          case DWT.BS:
+//              if (start is end) {
+//                  if (start is 0) return true;
+//                  start = Math.max (0, start - 1);
+//              }
+//              break;
+//          case DWT.DEL:
+//              if (start is end) {
+//                  if (start is charCount) return true;
+//                  end = Math.min (end + 1, charCount);
+//              }
+//              break;
+//          case DWT.CR:
+//              return true;
+//          default:
+//              if (event.character !is '\t' && event.character < 0x20) return true;
+//              oldText = new String (new char [] {event.character});
+//      }
+//      newText = verifyText (oldText, start, end, event);
+//      if (newText is null) return false;
+//      if (charCount - (end - start) + newText.length () > textLimit) {
+//          return false;
+//      }
+//      if (newText !is oldText) {
+//          String text = getText ();
+//          String leftText = text.substring (0, start);
+//          String rightText = text.substring (end, text.length ());
+//          setText (leftText + newText + rightText, false);
+//          start += newText.length ();
+//          setSelection (new Point (start, start));
+//      }
+//  }
+//  /*
+//  * Post the modify event so that the character will be inserted
+//  * into the widget when the modify event is delivered.  Normally,
+//  * modify events are sent but it is safe to post the event here
+//  * because this method is called from the event loop.
+//  */
+//  postEvent (DWT.Modify);
+//  return newText is oldText;
+//}
+
+void sendSelection () {
+    postEvent(DWT.Selection);
+}
+
+void setBackground (float [] color) {
+    NSColor nsColor;
+    if (color is null) {
+        return; // TODO reset to OS default
+    } else {
+        nsColor = NSColor.colorWithDeviceRed(color[0], color[1], color[2], 1);
+    }
+    ((NSTextField)view).setBackgroundColor(nsColor);
+}
+
+void setForeground (float [] color) {
+    NSColor nsColor;
+    if (color is null) {
+        return; // TODO reset to OS default
+    } 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 <ul>
+ *    <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)</li>
+ *    <li>ERROR_NULL_ARGUMENT - if the string is null</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void setItem (int index, String string) {
+    checkWidget ();
+    if (string is null) error (DWT.ERROR_NULL_ARGUMENT);
+    int count = getItemCount ();
+    if (0 > index || index >= count) error (DWT.ERROR_INVALID_RANGE);
+    NSString str = NSString.stringWith(string);
+    if ((style & DWT.READ_ONLY) !is 0) {
+        NSMenuItem nsItem = ((NSPopUpButton)view).itemAtIndex(index);
+        nsItem.setTitle(str);
+    } else {
+        NSComboBox widget = (NSComboBox)view;
+        widget.insertItemWithObjectValue(str, index);
+        widget.removeItemAtIndex(index + 1);
+    }
+}
+
+/**
+ * Sets the receiver's list to be the given array of items.
+ *
+ * @param items the array of items
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the items array is null</li>
+ *    <li>ERROR_INVALID_ARGUMENT - if an item in the items array is null</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void setItems (String [] items) {
+    checkWidget();
+    if (items is null) error (DWT.ERROR_NULL_ARGUMENT);
+    for (int i=0; i<items.length; i++) {
+        if (items [i] is null) error (DWT.ERROR_INVALID_ARGUMENT);
+    }
+    removeAll();
+    if (items.length is 0) return;
+    for (int i= 0; i < items.length; i++) {
+        NSString str = NSString.stringWith(items[i]);
+        if ((style & DWT.READ_ONLY) !is 0) {
+            NSMenu nsMenu = ((NSPopUpButton)view).menu();
+            NSMenuItem nsItem = (NSMenuItem)new NSMenuItem().alloc();
+            nsItem.initWithTitle(str, 0, NSString.stringWith(""));
+            nsMenu.addItem(nsItem);
+            nsItem.release();
+        } else {
+            ((NSComboBox)view).addItemWithObjectValue(str);
+        }
+    }
+}
+
+/*public*/ void setListVisible (bool visible) {
+    checkWidget ();
+    if ((style & DWT.READ_ONLY) !is 0) {
+        ((NSPopUpButton)view).setPullsDown(visible);
+    } else {
+    }
+}
+
+/**
+ * Sets the orientation of the receiver, which must be one
+ * of the constants <code>DWT.LEFT_TO_RIGHT</code> or <code>DWT.RIGHT_TO_LEFT</code>.
+ * <p>
+ *
+ * @param orientation new orientation style
+ * 
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ * 
+ * @since 2.1.2
+ */
+public void setOrientation (int orientation) {
+    checkWidget();
+}
+
+/**
+ * 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 <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the point is null</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void setSelection (Point selection) {
+    checkWidget ();
+    if (selection is null) error (DWT.ERROR_NULL_ARGUMENT);
+    if ((style & DWT.READ_ONLY) is 0) {
+//      int length = getCharCount ();
+//      int start = selection.x, end = selection.y;
+//      ControlEditTextSelectionRec sel = new ControlEditTextSelectionRec ();
+//      sel.selStart = (short) Math.min (Math.max (Math.min (start, end), 0), length);
+//      sel.selEnd = (short) Math.min (Math.max (Math.max (start, end), 0), length);
+//      if (hasFocus ()) {
+//          OS.SetControlData (handle, OS.kHIComboBoxEditTextPart, OS.kControlEditTextSelectionTag, 4, sel);
+//      } else {
+//          this.selection = sel;
+//      }
+    }
+}
+
+/**
+ * Sets the contents of the receiver's text field to the
+ * given string.
+ * <p>
+ * Note: The text field in a <code>Combo</code> 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.
+ * </p>
+ *
+ * @param string the new text
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the string is null</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void setText (String string) {
+    checkWidget ();
+    if (string is null) error (DWT.ERROR_NULL_ARGUMENT);
+    setText (string, true);
+}
+
+void setText (String string, bool notify) {
+    if (notify) {
+        if (hooks (DWT.Verify) || filters (DWT.Verify)) {
+            string = verifyText (string, 0, getCharCount (), null);
+            if (string is null) return;
+        }
+    }
+    if ((style & DWT.READ_ONLY) !is 0) {
+        int index = indexOf (string);
+        if (index !is -1 && index !is getSelectionIndex ()) {
+            select (index);
+            if (notify) sendEvent (DWT.Modify);
+        }
+    } else {
+        new NSCell(((NSComboBox)view).cell()).setTitle(NSString.stringWith(string));
+        if (notify) sendEvent (DWT.Modify);
+    }
+}
+
+/**
+ * Sets the maximum number of characters that the receiver's
+ * text field is capable of holding to be the argument.
+ * <p>
+ * To reset this value to the default, use <code>setTextLimit(Combo.LIMIT)</code>.
+ * Specifying a limit value larger than <code>Combo.LIMIT</code> sets the
+ * receiver's limit to <code>Combo.LIMIT</code>.
+ * </p>
+ * @param limit new text limit
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_CANNOT_BE_ZERO - if the limit is zero</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ * 
+ * @see #LIMIT
+ */
+public void setTextLimit (int limit) {
+    checkWidget ();
+    if (limit is 0) error (DWT.ERROR_CANNOT_BE_ZERO);
+    textLimit = limit;
+}
+
+/**
+ * Sets the number of items that are visible in the drop
+ * down portion of the receiver's list.
+ * <p>
+ * Note: This operation is a hint and is not supported on
+ * platforms that do not have this concept.
+ * </p>
+ *
+ * @param count the new number of items to be visible
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ * 
+ * @since 3.0
+ */
+public void setVisibleItemCount (int count) {
+    checkWidget ();
+    if (count < 0) return;
+    if ((style & DWT.READ_ONLY) !is 0) {
+        //TODO 
+    } else {
+        ((NSComboBox)view).setNumberOfVisibleItems(count);
+    }
+}
+
+String verifyText (String string, int start, int end, Event keyEvent) {
+    Event event = new Event ();
+    event.text = string;
+    event.start = start;
+    event.end = end;
+    if (keyEvent !is null) {
+        event.character = keyEvent.character;
+        event.keyCode = keyEvent.keyCode;
+        event.stateMask = keyEvent.stateMask;
+    }
+    /*
+     * 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 (DWT.Verify, event);
+    if (!event.doit || isDisposed ()) return null;
+    return event.text;
+}
+
+}