public Combo(Composite parent,
    int style) 
{
	super (parent, checkStyle (style));
	/* This code is intentionally commented */
	//if ((style & SWT.H_SCROLL) != 0) this.style |= SWT.H_SCROLL;
	this.style |= SWT.H_SCROLL;
}

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.

Parameters:

parent - a composite control which will be the parent of the new instance (cannot be null)

style - the style of control to construct

Throws:

IllegalArgumentException -
• ERROR_NULL_ARGUMENT - if the parent is null


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


Also see:

SWT#DROP_DOWN
SWT#READ_ONLY
SWT#SIMPLE
Widget#checkSubclass
Widget#getStyle
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

 int CBTProc(int nCode,
    int wParam,
    int lParam) 
{
	if ((int)/*64*/nCode == OS.HCBT_CREATEWND) {
		TCHAR buffer = new TCHAR (0, 128);
		OS.GetClassName (wParam, buffer, buffer.length ());
		String className = buffer.toString (0, buffer.strlen ());
		if (className.equals ("Edit") || className.equals ("EDIT")) { //$NON-NLS-1$  //$NON-NLS-2$
			int bits = OS.GetWindowLong (wParam, OS.GWL_STYLE);
			OS.SetWindowLong (wParam, OS.GWL_STYLE, bits & ~OS.ES_NOHIDESEL);
		}
	}
	return OS.CallNextHookEx (cbtHook, (int)/*64*/nCode, wParam, lParam);
}

 LRESULT WM_CTLCOLOR(int wParam,
    int lParam) 
{
	return wmColorChild (wParam, lParam);
}

 LRESULT WM_GETDLGCODE(int wParam,
    int lParam) 
{
	int /*long*/ code = callWindowProc (handle, OS.WM_GETDLGCODE, wParam, lParam);
	return new LRESULT (code | OS.DLGC_WANTARROWS);
}

 LRESULT WM_KILLFOCUS(int wParam,
    int lParam) 
{
	/*
	* Bug in Windows.  When a combo box that is read only
	* is disposed in CBN_KILLFOCUS, Windows segment faults.
	* The fix is to send focus from WM_KILLFOCUS instead
	* of CBN_KILLFOCUS.
	* 
	* NOTE: In version 6 of COMCTL32.DLL, the bug is fixed.
	*/
	if ((style & SWT.READ_ONLY) != 0) {
		return super.WM_KILLFOCUS (wParam, lParam);
	}
	/*
	* Return NULL - Focus notification is
	* done in WM_COMMAND by CBN_KILLFOCUS.
	*/
	return null;
}

 LRESULT WM_LBUTTONDOWN(int wParam,
    int lParam) 
{
	/*
	* Feature in Windows.  When an editable combo box is dropped
	* down and the text in the entry field partially matches an
	* item in the list, Windows selects the item but doesn't send
	* WM_COMMAND with CBN_SELCHANGE.  The fix is to detect that
	* the selection has changed and issue the notification.
	*/
	int oldSelection = (int)/*64*/OS.SendMessage (handle, OS.CB_GETCURSEL, 0, 0);
	LRESULT result = super.WM_LBUTTONDOWN (wParam, lParam);
	if (result == LRESULT.ZERO) return result;
	if ((style & SWT.READ_ONLY) == 0) {
		int newSelection = (int)/*64*/OS.SendMessage (handle, OS.CB_GETCURSEL, 0, 0);
		if (oldSelection != newSelection) {
			sendEvent (SWT.Modify);
			if (isDisposed ()) return LRESULT.ZERO;
			sendEvent (SWT.Selection);
			if (isDisposed ()) return LRESULT.ZERO;
		}
	}
	return result;
}

 LRESULT WM_SETFOCUS(int wParam,
    int lParam) 
{
	/*
	* Return NULL - Focus notification is
	* done by WM_COMMAND with CBN_SETFOCUS.
	*/
	return null;
}

 LRESULT WM_SIZE(int wParam,
    int lParam) 
{
	/*
	* Feature in Windows.  When a combo box is resized,
	* the size of the drop down rectangle is specified
	* using the height and then the combo box resizes
	* to be the height of the text field.  This causes
	* two WM_SIZE messages to be sent and two SWT.Resize
	* events to be issued.  The fix is to ignore the
	* second resize.
	*/
	if (ignoreResize) return null;
	/*
	* Bug in Windows.  If the combo box has the CBS_SIMPLE style,
	* the list portion of the combo box is not redrawn when the
	* combo box is resized.  The fix is to force a redraw when
	* the size has changed.
	*/
	if ((style & SWT.SIMPLE) != 0) {
		LRESULT result = super.WM_SIZE (wParam, lParam);
		if (OS.IsWindowVisible (handle)) {
			if (OS.IsWinCE) {	
				int /*long*/ hwndText = OS.GetDlgItem (handle, CBID_EDIT);
				if (hwndText != 0) OS.InvalidateRect (hwndText, null, true);
				int /*long*/ hwndList = OS.GetDlgItem (handle, CBID_LIST);
				if (hwndList != 0) OS.InvalidateRect (hwndList, null, true);
			} else {
				int uFlags = OS.RDW_ERASE | OS.RDW_INVALIDATE | OS.RDW_ALLCHILDREN;
				OS.RedrawWindow (handle, null, 0, uFlags);
			}
		}
		return result;
	}
	/*
	* Feature in Windows.  When an editable drop down combo box
	* contains text that does not correspond to an item in the
	* list, when the widget is resized, it selects the closest
	* match from the list.  The fix is to lock the current text
	* by ignoring all WM_SETTEXT messages during processing of
	* WM_SIZE.
	*/
	if ((style & SWT.READ_ONLY) == 0) lockText = true;
	LRESULT result = super.WM_SIZE (wParam, lParam);
	if ((style & SWT.READ_ONLY) == 0) lockText = false;
	/*
	* Feature in Windows.  When CB_SETDROPPEDWIDTH is called with
	* a width that is smaller than the current size of the combo
	* box, it is ignored.  This the fix is to set the width after
	* the combo box has been resized.
	*/
	if ((style & SWT.H_SCROLL) != 0) setScrollWidth (scrollWidth);
	return result;
}

 LRESULT WM_WINDOWPOSCHANGING(int wParam,
    int lParam) 
{
	LRESULT result = super.WM_WINDOWPOSCHANGING (wParam, lParam);
	if (result != null) return result;
	/*
	* Feature in Windows.  When a combo box is resized,
	* the size of the drop down rectangle is specified
	* using the height and then the combo box resizes
	* to be the height of the text field.  This causes
	* sibling windows that intersect with the original
	* bounds to redrawn.  The fix is to stop the redraw
	* using SWP_NOREDRAW and then damage the combo box
	* text field and the area in the parent where the
	* combo box used to be.
	*/
	if (OS.IsWinCE) return result;
	if (!getDrawing ()) return result;
	if (!OS.IsWindowVisible (handle)) return result;
	if (ignoreResize) {
		WINDOWPOS lpwp = new WINDOWPOS ();
		OS.MoveMemory (lpwp, lParam, WINDOWPOS.sizeof);
		if ((lpwp.flags & OS.SWP_NOSIZE) == 0) {
			lpwp.flags |= OS.SWP_NOREDRAW;
			OS.MoveMemory (lParam, lpwp, WINDOWPOS.sizeof);
			OS.InvalidateRect (handle, null, true);
			RECT rect = new RECT ();
			OS.GetWindowRect (handle, rect);
			int width = rect.right - rect.left;
			int height = rect.bottom - rect.top;
			if (width != 0 && height != 0) {
				int /*long*/ hwndParent = parent.handle;
				int /*long*/ hwndChild = OS.GetWindow (hwndParent, OS.GW_CHILD);
				OS.MapWindowPoints (0, hwndParent, rect, 2);
				int /*long*/ rgn1 = OS.CreateRectRgn (rect.left, rect.top, rect.right, rect.bottom);
				while (hwndChild != 0) {
					if (hwndChild != handle) {
						OS.GetWindowRect (hwndChild, rect);
						OS.MapWindowPoints (0, hwndParent, rect, 2);
						int /*long*/ rgn2 = OS.CreateRectRgn (rect.left, rect.top, rect.right, rect.bottom);
						OS.CombineRgn (rgn1, rgn1, rgn2, OS.RGN_DIFF);
						OS.DeleteObject (rgn2);
					}
					hwndChild = OS.GetWindow (hwndChild, OS.GW_HWNDNEXT);
				}
				int flags = OS.RDW_ERASE | OS.RDW_FRAME | OS.RDW_INVALIDATE;
				OS.RedrawWindow (hwndParent, null, rgn1, flags);
				OS.DeleteObject (rgn1);
			}
		}
	}
	return result;
}

 public  void add(String string) 
{
	checkWidget ();
	if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
	TCHAR buffer = new TCHAR (getCodePage (), string, true);
	int result = (int)/*64*/OS.SendMessage (handle, OS.CB_ADDSTRING, 0, buffer);
	if (result == OS.CB_ERR) error (SWT.ERROR_ITEM_NOT_ADDED);
	if (result == OS.CB_ERRSPACE) error (SWT.ERROR_ITEM_NOT_ADDED);
	if ((style & SWT.H_SCROLL) != 0) setScrollWidth (buffer, true);
}

Adds the argument to the end of the receiver's list.

 public  void add(String string,
    int index) 
{
	checkWidget ();
	if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
	int count = (int)/*64*/OS.SendMessage (handle, OS.CB_GETCOUNT, 0, 0);
	if (!(0 < = index && index < = count)) {
		error (SWT.ERROR_INVALID_RANGE);
	}
	TCHAR buffer = new TCHAR (getCodePage (), string, true);
	int result = (int)/*64*/OS.SendMessage (handle, OS.CB_INSERTSTRING, index, buffer);
	if (result == OS.CB_ERRSPACE || result == OS.CB_ERR) {
		error (SWT.ERROR_ITEM_NOT_ADDED);
	}
	if ((style & SWT.H_SCROLL) != 0) setScrollWidth (buffer, true);
}

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).

 public  void addModifyListener(ModifyListener listener) 
{
	checkWidget ();
	if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
	TypedListener typedListener = new TypedListener (listener);
	addListener (SWT.Modify, typedListener);
}

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.

 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 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.

 public  void addVerifyListener(VerifyListener listener) 
{
	checkWidget ();
	if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
	TypedListener typedListener = new TypedListener (listener);
	addListener (SWT.Verify, 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.

 int callWindowProc(int hwnd,
    int msg,
    int wParam,
    int lParam) 
{
	if (handle == 0) return 0;
	if (hwnd == handle) {
		switch (msg) {
			case OS.WM_SIZE: {
				ignoreResize = true;
				int /*long*/ result = OS.CallWindowProc (ComboProc, hwnd, msg, wParam, lParam);
				ignoreResize = false;
				return result;
			}
		}
		return OS.CallWindowProc (ComboProc, hwnd, msg, wParam, lParam);
	}
	int /*long*/ hwndText = OS.GetDlgItem (handle, CBID_EDIT);
	if (hwnd == hwndText) {
		if (lockText && msg == OS.WM_SETTEXT) return 0;
		return OS.CallWindowProc (EditProc, hwnd, msg, wParam, lParam);
	}
	int /*long*/ hwndList = OS.GetDlgItem (handle, CBID_LIST);
	if (hwnd == hwndList) {
		return OS.CallWindowProc (ListProc, hwnd, msg, wParam, lParam);
	}
	return OS.DefWindowProc (hwnd, msg, wParam, lParam);
}

 boolean checkHandle(int hwnd) 
{
	return hwnd == handle || hwnd == OS.GetDlgItem (handle, CBID_EDIT) || hwnd == OS.GetDlgItem (handle, CBID_LIST);
}

 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;
}

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

 public  void clearSelection() 
{
	checkWidget ();
	OS.SendMessage (handle, OS.CB_SETEDITSEL, 0, -1);
}

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().

 public Point computeSize(int wHint,
    int hHint,
    boolean changed) 
{
	checkWidget ();
	int width = 0, height = 0;
	if (wHint == SWT.DEFAULT) {
		int /*long*/ newFont, oldFont = 0;
		int /*long*/ hDC = OS.GetDC (handle);
		newFont = OS.SendMessage (handle, OS.WM_GETFONT, 0, 0);
		if (newFont != 0) oldFont = OS.SelectObject (hDC, newFont);
		int count = (int)/*64*/OS.SendMessage (handle, OS.CB_GETCOUNT, 0, 0);
		RECT rect = new RECT ();
		int flags = OS.DT_CALCRECT | OS.DT_NOPREFIX;
		if ((style & SWT.READ_ONLY) == 0) flags |= OS.DT_EDITCONTROL;
		int length = OS.GetWindowTextLength (handle);
		int cp = getCodePage ();
		TCHAR buffer = new TCHAR (cp, length + 1);
		OS.GetWindowText (handle, buffer, length + 1);
		OS.DrawText (hDC, buffer, length, rect, flags);
		width = Math.max (width, rect.right - rect.left);
		if ((style & SWT.H_SCROLL) != 0) {
			width = Math.max (width, scrollWidth);
		} else {
			for (int i=0; i< count; i++) {
				length = (int)/*64*/OS.SendMessage (handle, OS.CB_GETLBTEXTLEN, i, 0);
				if (length != OS.CB_ERR) {
					if (length + 1  > buffer.length ()) buffer = new TCHAR (cp, length + 1);
					int result = (int)/*64*/OS.SendMessage (handle, OS.CB_GETLBTEXT, i, buffer);
					if (result != OS.CB_ERR) {
						OS.DrawText (hDC, buffer, length, rect, flags);
						width = Math.max (width, rect.right - rect.left);
					}
				}
			}
		}
		if (newFont != 0) OS.SelectObject (hDC, oldFont);
		OS.ReleaseDC (handle, hDC);
	}
	if (hHint == SWT.DEFAULT) {
		if ((style & SWT.SIMPLE) != 0) {
			int count = (int)/*64*/OS.SendMessage (handle, OS.CB_GETCOUNT, 0, 0);
			int itemHeight = (int)/*64*/OS.SendMessage (handle, OS.CB_GETITEMHEIGHT, 0, 0);
			height = count * itemHeight;
		}
	}
	if (width == 0) width = DEFAULT_WIDTH;
	if (height == 0) height = DEFAULT_HEIGHT;
	if (wHint != SWT.DEFAULT) width = wHint;
	if (hHint != SWT.DEFAULT) height = hHint;
	if ((style & SWT.READ_ONLY) != 0) {
		width += 8;
	} else {
		int /*long*/ hwndText = OS.GetDlgItem (handle, CBID_EDIT);
		if (hwndText != 0) {
			int /*long*/ margins = OS.SendMessage (hwndText, OS.EM_GETMARGINS, 0, 0);
			int marginWidth = OS.LOWORD (margins) + OS.HIWORD (margins);
			width += marginWidth + 3;
		}
	}
	COMBOBOXINFO pcbi = new COMBOBOXINFO ();
	pcbi.cbSize = COMBOBOXINFO.sizeof;
	if (((style & SWT.SIMPLE) == 0) && !OS.IsWinCE && OS.GetComboBoxInfo (handle, pcbi)) {
		width += pcbi.itemLeft + (pcbi.buttonRight - pcbi.buttonLeft);
		height = (pcbi.buttonBottom - pcbi.buttonTop) + pcbi.buttonTop * 2; 
	} else {
		int border = OS.GetSystemMetrics (OS.SM_CXEDGE);
		width += OS.GetSystemMetrics (OS.SM_CXVSCROLL) + border * 2;		
		int textHeight = (int)/*64*/OS.SendMessage (handle, OS.CB_GETITEMHEIGHT, -1, 0);
		if ((style & SWT.DROP_DOWN) != 0) {
			height = textHeight + 6;
		} else {
			height += textHeight + 10;
		}
	}
	if ((style & SWT.SIMPLE) != 0 && (style & SWT.H_SCROLL) != 0) {
		height += OS.GetSystemMetrics (OS.SM_CYHSCROLL);
	}
	return new Point (width, height);
}

 public  void copy() 
{
	checkWidget ();
	OS.SendMessage (handle, OS.WM_COPY, 0, 0);
}

Copies the selected text.

The current selection is copied to the clipboard.

  void createHandle() 
{
	/*
	* Feature in Windows.  When the selection changes in a combo box,
	* Windows draws the selection, even when the combo box does not
	* have focus.  Strictly speaking, this is the correct Windows
	* behavior because the combo box sets ES_NOHIDESEL on the text
	* control that it creates.  Despite this, it looks strange because
	* Windows also clears the selection and selects all the text when
	* the combo box gets focus.  The fix is use the CBT hook to clear
	* the ES_NOHIDESEL style bit when the text control is created.
	*/
	if (OS.IsWinCE || (style & (SWT.READ_ONLY | SWT.SIMPLE)) != 0) {
		super.createHandle ();
	} else {
		int threadId = OS.GetCurrentThreadId ();
		Callback cbtCallback = new Callback (this, "CBTProc", 3); //$NON-NLS-1$
		int /*long*/ cbtProc = cbtCallback.getAddress ();
		if (cbtProc == 0) error (SWT.ERROR_NO_MORE_CALLBACKS);
		cbtHook = OS.SetWindowsHookEx (OS.WH_CBT, cbtProc, 0, threadId);
		super.createHandle ();
		if (cbtHook != 0) OS.UnhookWindowsHookEx (cbtHook);
		cbtHook = 0;
		cbtCallback.dispose ();
	}
	state &= ~(CANVAS | THEME_BACKGROUND);
	/* Get the text and list window procs */
	int /*long*/ hwndText = OS.GetDlgItem (handle, CBID_EDIT);
	if (hwndText != 0 && EditProc == 0) {
		EditProc = OS.GetWindowLongPtr (hwndText, OS.GWLP_WNDPROC);
	}
	int /*long*/ hwndList = OS.GetDlgItem (handle, CBID_LIST);
	if (hwndList != 0 && ListProc == 0) {
		ListProc = OS.GetWindowLongPtr (hwndList, OS.GWLP_WNDPROC);
	}
	/*
	* Bug in Windows.  If the combo box has the CBS_SIMPLE style,
	* the list portion of the combo box is not drawn correctly the
	* first time, causing pixel corruption.  The fix is to ensure
	* that the combo box has been resized more than once.
	*/
	if ((style & SWT.SIMPLE) != 0) {
		int flags = OS.SWP_NOZORDER | OS.SWP_DRAWFRAME | OS.SWP_NOACTIVATE;
		SetWindowPos (handle, 0, 0, 0, 0x3FFF, 0x3FFF, flags);
		SetWindowPos (handle, 0, 0, 0, 0, 0, flags);
	}
}

 public  void cut() 
{
	checkWidget ();
	if ((style & SWT.READ_ONLY) != 0) return;
	OS.SendMessage (handle, OS.WM_CUT, 0, 0);
}

Cuts the selected text.

The current selection is first copied to the clipboard and then deleted from the widget.

 int defaultBackground() 
{
	return OS.GetSysColor (OS.COLOR_WINDOW);
}

  void deregister() 
{
	super.deregister ();
	int /*long*/ hwndText = OS.GetDlgItem (handle, CBID_EDIT);
	if (hwndText != 0) display.removeControl (hwndText);
	int /*long*/ hwndList = OS.GetDlgItem (handle, CBID_LIST);
	if (hwndList != 0) display.removeControl (hwndList);
}

 public  void deselect(int index) 
{
	checkWidget ();
	int selection = (int)/*64*/OS.SendMessage (handle, OS.CB_GETCURSEL, 0, 0);
	if (index != selection) return;
	OS.SendMessage (handle, OS.CB_SETCURSEL, -1, 0);
	sendEvent (SWT.Modify);
	// widget could be disposed at this point
}

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.

 public  void deselectAll() 
{
	checkWidget ();
	OS.SendMessage (handle, OS.CB_SETCURSEL, -1, 0);
	sendEvent (SWT.Modify);
	// widget could be disposed at this point
}

Deselects all selected items in the receiver's list.

Note: To clear the selection in the receiver's text field, use clearSelection().

 boolean dragDetect(int hwnd,
    int x,
    int y,
    boolean filter,
    boolean[] detect,
    boolean[] consume) 
{
	if (filter && (style & SWT.READ_ONLY) == 0) {
		int /*long*/ hwndText = OS.GetDlgItem (handle, CBID_EDIT);
		if (hwndText != 0) {
			int [] start = new int [1], end = new int [1];
			OS.SendMessage (handle, OS.CB_GETEDITSEL, start, end);
			if (start [0] != end [0]) {
				int /*long*/ lParam = OS.MAKELPARAM (x, y);
				int position = OS.LOWORD (OS.SendMessage (hwndText, OS.EM_CHARFROMPOS, 0, lParam));
				if (start [0] < = position && position <  end [0]) {
					if (super.dragDetect (hwnd, x, y, filter, detect, consume)) {
						if (consume != null) consume [0] = true;
						return true;
					}
				}
			}
			return false;
		}
	}
	return super.dragDetect (hwnd, x, y, filter, detect, consume);
}

 public String getItem(int index) 
{
	checkWidget ();
	int length = (int)/*64*/OS.SendMessage (handle, OS.CB_GETLBTEXTLEN, index, 0);
	if (length != OS.CB_ERR) {
		TCHAR buffer = new TCHAR (getCodePage (), length + 1);
		int result = (int)/*64*/OS.SendMessage (handle, OS.CB_GETLBTEXT, index, buffer);
		if (result != OS.CB_ERR) return buffer.toString (0, length);
	}
	int count = (int)/*64*/OS.SendMessage (handle, OS.CB_GETCOUNT, 0, 0);
	if (0 < = index && index <  count) error (SWT.ERROR_CANNOT_GET_ITEM);
	error (SWT.ERROR_INVALID_RANGE);
	return "";
}

Returns the item at the given, zero-relative index in the receiver's list. Throws an exception if the index is out of range.

 public int getItemCount() 
{
	checkWidget ();
	int count = (int)/*64*/OS.SendMessage (handle, OS.CB_GETCOUNT, 0, 0);
	if (count == OS.CB_ERR) error (SWT.ERROR_CANNOT_GET_COUNT);
	return count;
}

Returns the number of items contained in the receiver's list.

 public int getItemHeight() 
{
	checkWidget ();
	int result = (int)/*64*/OS.SendMessage (handle, OS.CB_GETITEMHEIGHT, 0, 0);
	if (result == OS.CB_ERR) error (SWT.ERROR_CANNOT_GET_ITEM_HEIGHT);
	return result;
}

Returns the height of the area which would be used to display one of the items in the receiver's list.

 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;
}

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.

 public boolean getListVisible() 
{
	checkWidget ();
	if ((style & SWT.DROP_DOWN) != 0) {
		return OS.SendMessage (handle, OS.CB_GETDROPPEDSTATE, 0, 0) != 0;
	}
	return true;
}

Returns true 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.

 String getNameText() 
{
	return getText ();
}

 public int getOrientation() 
{
	checkWidget();
	return style & (SWT.LEFT_TO_RIGHT | SWT.RIGHT_TO_LEFT);
}

Returns the orientation of the receiver.

 public Point getSelection() 
{
	checkWidget ();
	if ((style & SWT.DROP_DOWN) != 0 && (style & SWT.READ_ONLY) != 0) {
		return new Point (0, OS.GetWindowTextLength (handle));
	}
	int [] start = new int [1], end = new int [1];
	OS.SendMessage (handle, OS.CB_GETEDITSEL, start, end);
	if (!OS.IsUnicode && OS.IsDBLocale) {
		start [0] = mbcsToWcsPos (start [0]);
		end [0] = mbcsToWcsPos (end [0]);
	}
	return new Point (start [0], end [0]);
}

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.

 public int getSelectionIndex() 
{
	checkWidget ();
	if (noSelection) return -1;
	return (int)/*64*/OS.SendMessage (handle, OS.CB_GETCURSEL, 0, 0);
}

Returns the zero-relative index of the item which is currently selected in the receiver's list, or -1 if no item is selected.

 public String getText() 
{
	checkWidget ();
	int length = OS.GetWindowTextLength (handle);
	if (length == 0) return "";
	TCHAR buffer = new TCHAR (getCodePage (), length + 1);
	OS.GetWindowText (handle, buffer, length + 1);
	return buffer.toString (0, length);
}

Returns a string containing a copy of the contents of the receiver's text field, or an empty string if there are no contents.

 public int getTextHeight() 
{
	checkWidget ();
	COMBOBOXINFO pcbi = new COMBOBOXINFO ();
	pcbi.cbSize = COMBOBOXINFO.sizeof;
	if (((style & SWT.SIMPLE) == 0) && !OS.IsWinCE && OS.GetComboBoxInfo (handle, pcbi)) {
		return (pcbi.buttonBottom - pcbi.buttonTop) + pcbi.buttonTop * 2; 
	}
	int result = (int)/*64*/OS.SendMessage (handle, OS.CB_GETITEMHEIGHT, -1, 0);
	if (result == OS.CB_ERR) error (SWT.ERROR_CANNOT_GET_ITEM_HEIGHT);
	return (style & SWT.DROP_DOWN) != 0 ? result + 6 : result + 10;
}

Returns the height of the receivers's text field.

 public int getTextLimit() 
{
	checkWidget ();
	int /*long*/ hwndText = OS.GetDlgItem (handle, CBID_EDIT);
	if (hwndText == 0) return LIMIT;
	return (int)/*64*/OS.SendMessage (hwndText, OS.EM_GETLIMITTEXT, 0, 0) & 0x7FFFFFFF;
}

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.

 public int getVisibleItemCount() 
{
	checkWidget ();
	return visibleCount;
}

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.

 boolean hasFocus() 
{
	int /*long*/ hwndFocus = OS.GetFocus ();
	if (hwndFocus == handle) return true;
	if (hwndFocus == 0) return false;
	int /*long*/ hwndText = OS.GetDlgItem (handle, CBID_EDIT);
	if (hwndFocus == hwndText) return true;
	int /*long*/ hwndList = OS.GetDlgItem (handle, CBID_LIST);
	if (hwndFocus == hwndList) return true;
	return false;
}

 public int indexOf(String string) 
{
	return indexOf (string, 0);
}

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.

 public int indexOf(String string,
    int start) 
{
	checkWidget ();
	if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
	/*
	* Bug in Windows.  For some reason, CB_FINDSTRINGEXACT
	* will not find empty strings even though it is legal
	* to insert an empty string into a combo.  The fix is
	* to search the combo, an item at a time.
	*/
	if (string.length () == 0) {
		int count = getItemCount ();
		for (int i=start; i< count; i++) {
			if (string.equals (getItem (i))) return i;
		}
		return -1;
	}
	/* Use CB_FINDSTRINGEXACT to search for the item */	
	int count = (int)/*64*/OS.SendMessage (handle, OS.CB_GETCOUNT, 0, 0);
	if (!(0 < = start && start <  count)) return -1;
	int index = start - 1, last = 0;
	TCHAR buffer = new TCHAR (getCodePage (), string, true);
	do {
		index = (int)/*64*/OS.SendMessage (handle, OS.CB_FINDSTRINGEXACT, last = index, buffer);
		if (index == OS.CB_ERR || index < = last) return -1;
	} while (!string.equals (getItem (index)));
	return index;
}

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.

 int mbcsToWcsPos(int mbcsPos) 
{
	if (mbcsPos < = 0) return 0;
	if (OS.IsUnicode) return mbcsPos;
	int /*long*/ hwndText = OS.GetDlgItem (handle, CBID_EDIT);
	if (hwndText == 0) return mbcsPos;
	int mbcsSize = OS.GetWindowTextLengthA (hwndText);
	if (mbcsSize == 0) return 0;
	if (mbcsPos  >= mbcsSize) return mbcsSize;
	byte [] buffer = new byte [mbcsSize + 1];
	OS.GetWindowTextA (hwndText, buffer, mbcsSize + 1);
	return OS.MultiByteToWideChar (getCodePage (), OS.MB_PRECOMPOSED, buffer, mbcsPos, null, 0);
}

 public  void paste() 
{
	checkWidget ();
	if ((style & SWT.READ_ONLY) != 0) return;
	OS.SendMessage (handle, OS.WM_PASTE, 0, 0);
}

Pastes text from clipboard.

The selected text is deleted from the widget and new text inserted from the clipboard.

  void register() 
{
	super.register ();
	int /*long*/ hwndText = OS.GetDlgItem (handle, CBID_EDIT);
	if (hwndText != 0) display.addControl (hwndText, this);
	int /*long*/ hwndList = OS.GetDlgItem (handle, CBID_LIST);
	if (hwndList != 0) display.addControl (hwndList, this);
}

 public  void remove(int index) 
{
	checkWidget ();
	remove (index, true);
}

Removes the item from the receiver's list at the given zero-relative index.

 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);
}

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.

  void remove(int index,
    boolean notify) 
{
	TCHAR buffer = null;
	if ((style & SWT.H_SCROLL) != 0) {
		int length = (int)/*64*/OS.SendMessage (handle, OS.CB_GETLBTEXTLEN, index, 0);
		if (length == OS.CB_ERR) {
			int count = (int)/*64*/OS.SendMessage (handle, OS.CB_GETCOUNT, 0, 0);
			if (0 < = index && index <  count) error (SWT.ERROR_ITEM_NOT_REMOVED);
			error (SWT.ERROR_INVALID_RANGE);
		}
		buffer = new TCHAR (getCodePage (), length + 1);
		int result = (int)/*64*/OS.SendMessage (handle, OS.CB_GETLBTEXT, index, buffer);
		if (result == OS.CB_ERR) {
			int count = (int)/*64*/OS.SendMessage (handle, OS.CB_GETCOUNT, 0, 0);
			if (0 < = index && index <  count) error (SWT.ERROR_ITEM_NOT_REMOVED);
			error (SWT.ERROR_INVALID_RANGE);
		}
	}
	int length = OS.GetWindowTextLength (handle);
	int code = (int)/*64*/OS.SendMessage (handle, OS.CB_DELETESTRING, index, 0);
	if (code == OS.CB_ERR) {
		int count = (int)/*64*/OS.SendMessage (handle, OS.CB_GETCOUNT, 0, 0);
		if (0 < = index && index <  count) error (SWT.ERROR_ITEM_NOT_REMOVED);
		error (SWT.ERROR_INVALID_RANGE);
	}
	if ((style & SWT.H_SCROLL) != 0) setScrollWidth (buffer, true);
	if (notify && length != OS.GetWindowTextLength (handle)) {
		sendEvent (SWT.Modify);
		if (isDisposed ()) return;
	}
	/*
	* Bug in Windows.  When the combo box is read only
	* with exactly one item that is currently selected
	* and that item is removed, the combo box does not
	* redraw to clear the text area.  The fix is to
	* force a redraw.
	*/
	if ((style & SWT.READ_ONLY) != 0) {		
		int count = (int)/*64*/OS.SendMessage (handle, OS.CB_GETCOUNT, 0, 0);
		if (count == 0) OS.InvalidateRect (handle, null, true);
	}
}

 public  void remove(int start,
    int end) 
{
	checkWidget ();
	if (start  > end) return;
	int count = (int)/*64*/OS.SendMessage (handle, OS.CB_GETCOUNT, 0, 0);
	if (!(0 < = start && start < = end && end <  count)) {
		error (SWT.ERROR_INVALID_RANGE);
	}
	int textLength = OS.GetWindowTextLength (handle);
	RECT rect = null;
	int /*long*/ hDC = 0, oldFont = 0, newFont = 0;
	int newWidth = 0;
	if ((style & SWT.H_SCROLL) != 0) {
		rect = new RECT ();
		hDC = OS.GetDC (handle);
		newFont = OS.SendMessage (handle, OS.WM_GETFONT, 0, 0);
		if (newFont != 0) oldFont = OS.SelectObject (hDC, newFont);
	}
	int cp = getCodePage ();
	int flags = OS.DT_CALCRECT | OS.DT_SINGLELINE | OS.DT_NOPREFIX;
	for (int i=start; i< =end; i++) {
		TCHAR buffer = null;
		if ((style & SWT.H_SCROLL) != 0) {
			int length = (int)/*64*/OS.SendMessage (handle, OS.CB_GETLBTEXTLEN, start, 0);
			if (length == OS.CB_ERR) break;
			buffer = new TCHAR (cp, length + 1);
			int result = (int)/*64*/OS.SendMessage (handle, OS.CB_GETLBTEXT, start, buffer);
			if (result == OS.CB_ERR) break;
		}
		int result = (int)/*64*/OS.SendMessage (handle, OS.CB_DELETESTRING, start, 0);
		if (result == OS.CB_ERR) error (SWT.ERROR_ITEM_NOT_REMOVED);
		if ((style & SWT.H_SCROLL) != 0) {
			OS.DrawText (hDC, buffer, -1, rect, flags);
			newWidth = Math.max (newWidth, rect.right - rect.left);
		}
	}
	if ((style & SWT.H_SCROLL) != 0) {
		if (newFont != 0) OS.SelectObject (hDC, oldFont);
		OS.ReleaseDC (handle, hDC);
		setScrollWidth (newWidth, false);
	}
	if (textLength != OS.GetWindowTextLength (handle)) {
		sendEvent (SWT.Modify);
		if (isDisposed ()) return;
	}
	/*
	* Bug in Windows.  When the combo box is read only
	* with exactly one item that is currently selected
	* and that item is removed, the combo box does not
	* redraw to clear the text area.  The fix is to
	* force a redraw.
	*/
	if ((style & SWT.READ_ONLY) != 0) {		
		count = (int)/*64*/OS.SendMessage (handle, OS.CB_GETCOUNT, 0, 0);
		if (count == 0) OS.InvalidateRect (handle, null, true);
	}
}

Removes the items from the receiver's list which are between the given zero-relative start and end indices (inclusive).

 public  void removeAll() 
{
	checkWidget ();
	OS.SendMessage (handle, OS.CB_RESETCONTENT, 0, 0);
	sendEvent (SWT.Modify);
	if (isDisposed ()) return;
	if ((style & SWT.H_SCROLL) != 0) setScrollWidth (0);
}

Removes all of the items from the receiver's list and clear the contents of receiver's text field.

 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.

 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 user changes the receiver's selection.

 public  void removeVerifyListener(VerifyListener listener) 
{
	checkWidget ();
	if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
	if (eventTable == null) return;
	eventTable.unhook (SWT.Verify, listener);
}

Removes the listener from the collection of listeners who will be notified when the control is verified.

 public  void select(int index) 
{
	checkWidget ();
	int count = (int)/*64*/OS.SendMessage (handle, OS.CB_GETCOUNT, 0, 0);
	if (0 < = index && index <  count) {
		int selection = (int)/*64*/OS.SendMessage (handle, OS.CB_GETCURSEL, 0, 0);
		int code = (int)/*64*/OS.SendMessage (handle, OS.CB_SETCURSEL, index, 0);
		if (code != OS.CB_ERR && code != selection) {
			sendEvent (SWT.Modify);
			// widget could be disposed at this point
		}
	}
}

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.

 boolean sendKeyEvent(int type,
    int msg,
    int wParam,
    int lParam,
    Event event) 
{
	if (!super.sendKeyEvent (type, msg, wParam, lParam, event)) {
		return false;
	}
	if ((style & SWT.READ_ONLY) != 0) return true;
	if (type != SWT.KeyDown) return true;
	if (msg != OS.WM_CHAR && msg != OS.WM_KEYDOWN && msg != OS.WM_IME_CHAR) {
		return true;
	}
	if (event.character == 0) return true;
	if (!hooks (SWT.Verify) && !filters (SWT.Verify)) return true;
	char key = event.character;
	int stateMask = event.stateMask;
	/*
	* Disable all magic keys that could modify the text
	* and don't send events when Alt, Shift or Ctrl is
	* pressed.
	*/
	switch (msg) {
		case OS.WM_CHAR:
			if (key != 0x08 && key != 0x7F && key != '\r' && key != '\t' && key != '\n') break;
			// FALL THROUGH
		case OS.WM_KEYDOWN:
			if ((stateMask & (SWT.ALT | SWT.SHIFT | SWT.CONTROL)) != 0) return false;
			break;
	}
	/*
	* If the left button is down, the text widget refuses the character.
	*/
	if (OS.GetKeyState (OS.VK_LBUTTON) <  0) {
		return true;
	}
	/* Verify the character */
	String oldText = "";
	int [] start = new int [1], end = new int [1];
	int /*long*/ hwndText = OS.GetDlgItem (handle, CBID_EDIT);
	if (hwndText == 0) return true;
	OS.SendMessage (hwndText, OS.EM_GETSEL, start, end);
	switch (key) {
		case 0x08:	/* Bs */
			if (start [0] == end [0]) {
				if (start [0] == 0) return true;
				start [0] = start [0] - 1;
				if (!OS.IsUnicode && OS.IsDBLocale) {
					int [] newStart = new int [1], newEnd = new int [1];
					OS.SendMessage (hwndText, OS.EM_SETSEL, start [0], end [0]);
					OS.SendMessage (hwndText, OS.EM_GETSEL, newStart, newEnd);
					if (start [0] != newStart [0]) start [0] = start [0] - 1;
				}
				start [0] = Math.max (start [0], 0);
			}
			break;
		case 0x7F:	/* Del */
			if (start [0] == end [0]) {
				int length = OS.GetWindowTextLength (hwndText);
				if (start [0] == length) return true;
				end [0] = end [0] + 1;
				if (!OS.IsUnicode && OS.IsDBLocale) {
					int [] newStart = new int [1], newEnd = new int [1];
					OS.SendMessage (hwndText, OS.EM_SETSEL, start [0], end [0]);
					OS.SendMessage (hwndText, OS.EM_GETSEL, newStart, newEnd);
					if (end [0] != newEnd [0]) end [0] = end [0] + 1;
				}
				end [0] = Math.min (end [0], length);
			}
			break;
		case '\r':	/* Return */
			return true;
		default:	/* Tab and other characters */
			if (key != '\t' && key <  0x20) return true;
			oldText = new String (new char [] {key});
			break;
	}
	String newText = verifyText (oldText, start [0], end [0], event);
	if (newText == null) return false;
	if (newText == oldText) return true;
	TCHAR buffer = new TCHAR (getCodePage (), newText, true);
	OS.SendMessage (hwndText, OS.EM_SETSEL, start [0], end [0]);
	OS.SendMessage (hwndText, OS.EM_REPLACESEL, 0, buffer);
	return false;
}

  void setBackgroundImage(int hBitmap) 
{
	super.setBackgroundImage (hBitmap);
	int /*long*/ hwndText = OS.GetDlgItem (handle, CBID_EDIT);
	if (hwndText != 0) OS.InvalidateRect (hwndText, null, true);
	int /*long*/ hwndList = OS.GetDlgItem (handle, CBID_LIST);
	if (hwndList != 0) OS.InvalidateRect (hwndList, null, true);
}

  void setBackgroundPixel(int pixel) 
{
	super.setBackgroundPixel (pixel);
	int /*long*/ hwndText = OS.GetDlgItem (handle, CBID_EDIT);
	if (hwndText != 0) OS.InvalidateRect (hwndText, null, true);
	int /*long*/ hwndList = OS.GetDlgItem (handle, CBID_LIST);
	if (hwndList != 0) OS.InvalidateRect (hwndList, null, true);
}

  void setBounds(int x,
    int y,
    int width,
    int height,
    int flags) 
{
	/*
	* Feature in Windows.  If the combo box has the CBS_DROPDOWN
	* or CBS_DROPDOWNLIST style, Windows uses the height that the
	* programmer sets in SetWindowPos () to control height of the
	* drop down list.  When the width is non-zero, Windows remembers
	* this value and sets the height to be the height of the text
	* field part of the combo box.  If the width is zero, Windows
	* allows the height to have any value.  Therefore, when the
	* programmer sets and then queries the height, the values can
	* be different depending on the width.  The problem occurs when
	* the programmer uses computeSize () to determine the preferred
	* height (always the height of the text field) and then uses
	* this value to set the height of the combo box.  The result
	* is a combo box with a zero size drop down list.  The fix, is
	* to always set the height to show a fixed number of combo box
	* items and ignore the height value that the programmer supplies.
	*/
	if ((style & SWT.DROP_DOWN) != 0) {
		height = getTextHeight () + (getItemHeight () * visibleCount) + 2;
		/*
		* Feature in Windows.  When a drop down combo box is resized,
		* the combo box resizes the height of the text field and uses
		* the height provided in SetWindowPos () to determine the height
		* of the drop down list.  For some reason, the combo box redraws
		* the whole area, not just the text field.  The fix is to set the
		* SWP_NOSIZE bits when the height of text field and the drop down
		* list is the same as the requested height.
		* 
		* NOTE:  Setting the width of a combo box to zero does not update
		* the width of the drop down control rect.  If the width of the
		* combo box is zero, then do not set SWP_NOSIZE.
		*/
		RECT rect = new RECT ();
		OS.GetWindowRect (handle, rect);
		if (rect.right - rect.left != 0) {
			if (OS.SendMessage (handle, OS.CB_GETDROPPEDCONTROLRECT, 0, rect) != 0) {
				int oldWidth = rect.right - rect.left, oldHeight = rect.bottom - rect.top;
				if (oldWidth == width && oldHeight == height) flags |= OS.SWP_NOSIZE;
			}
		}
		SetWindowPos (handle, 0, x, y, width, height, flags);
	} else {
		super.setBounds (x, y, width, height, flags);
	}
}

 public  void setFont(Font font) 
{
	checkWidget ();
	super.setFont (font);
	if ((style & SWT.H_SCROLL) != 0) setScrollWidth ();
}

  void setForegroundPixel(int pixel) 
{
	super.setForegroundPixel (pixel);
	int /*long*/ hwndText = OS.GetDlgItem (handle, CBID_EDIT);
	if (hwndText != 0) OS.InvalidateRect (hwndText, null, true);
	int /*long*/ hwndList = OS.GetDlgItem (handle, CBID_LIST);
	if (hwndList != 0) OS.InvalidateRect (hwndList, null, true);
}

 public  void setItem(int index,
    String string) 
{
	checkWidget ();
	if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
	int selection = getSelectionIndex ();
	remove (index, false);
	if (isDisposed ()) return;
	add (string, index);
	if (selection != -1) select (selection);
}

Sets the text of the item in the receiver's list at the given zero-relative index to the string argument.

 public  void setItems(String[] items) 
{
	checkWidget ();
	if (items == null) error (SWT.ERROR_NULL_ARGUMENT);
	for (int i=0; i< items.length; i++) {
		if (items [i] == null) error (SWT.ERROR_INVALID_ARGUMENT);
	}
	RECT rect = null;
	int /*long*/ hDC = 0, oldFont = 0, newFont = 0;
	int newWidth = 0;
	if ((style & SWT.H_SCROLL) != 0) {
		rect = new RECT ();
		hDC = OS.GetDC (handle);
		newFont = OS.SendMessage (handle, OS.WM_GETFONT, 0, 0);
		if (newFont != 0) oldFont = OS.SelectObject (hDC, newFont);
		setScrollWidth (0);
	}
	OS.SendMessage (handle, OS.CB_RESETCONTENT, 0, 0);
	int codePage = getCodePage ();
	for (int i=0; i< items.length; i++) {
		String string = items [i];
		TCHAR buffer = new TCHAR (codePage, string, true);
		int code = (int)/*64*/OS.SendMessage (handle, OS.CB_ADDSTRING, 0, buffer);
		if (code == OS.CB_ERR) error (SWT.ERROR_ITEM_NOT_ADDED);
		if (code == OS.CB_ERRSPACE) error (SWT.ERROR_ITEM_NOT_ADDED);
		if ((style & SWT.H_SCROLL) != 0) {
			int flags = OS.DT_CALCRECT | OS.DT_SINGLELINE | OS.DT_NOPREFIX;
			OS.DrawText (hDC, buffer, -1, rect, flags);
			newWidth = Math.max (newWidth, rect.right - rect.left);
		}
	}
	if ((style & SWT.H_SCROLL) != 0) {
		if (newFont != 0) OS.SelectObject (hDC, oldFont);
		OS.ReleaseDC (handle, hDC);
		setScrollWidth (newWidth + 3);
	}
	sendEvent (SWT.Modify);
	// widget could be disposed at this point
}

Sets the receiver's list to be the given array of items.

 public  void setListVisible(boolean visible) 
{
	checkWidget ();
	OS.SendMessage (handle, OS.CB_SHOWDROPDOWN, visible ? 1 : 0, 0);
}

Marks the receiver's list as visible if the argument is true, 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.

 public  void setOrientation(int orientation) 
{
	checkWidget();
	if (OS.IsWinCE) return;
	if (OS.WIN32_VERSION <  OS.VERSION (4, 10)) return;
	int flags = SWT.RIGHT_TO_LEFT | SWT.LEFT_TO_RIGHT;
	if ((orientation & flags) == 0 || (orientation & flags) == flags) return;
	style &= ~flags;
	style |= orientation & flags;
	int bits  = OS.GetWindowLong (handle, OS.GWL_EXSTYLE);
	if ((style & SWT.RIGHT_TO_LEFT) != 0) {
		style |= SWT.MIRRORED;
		bits |= OS.WS_EX_LAYOUTRTL;
	} else {
		style &= ~SWT.MIRRORED;
		bits &= ~OS.WS_EX_LAYOUTRTL;
	}
	OS.SetWindowLong (handle, OS.GWL_EXSTYLE, bits);
	int /*long*/ hwndText = 0, hwndList = 0;
	COMBOBOXINFO pcbi = new COMBOBOXINFO ();
	pcbi.cbSize = COMBOBOXINFO.sizeof;
	if (OS.GetComboBoxInfo (handle, pcbi)) {
		hwndText = pcbi.hwndItem;
		hwndList = pcbi.hwndList;
	}
	if (hwndText != 0) {
		int bits1 = OS.GetWindowLong (hwndText, OS.GWL_EXSTYLE);
		int bits2 = OS.GetWindowLong (hwndText, OS.GWL_STYLE);
		if ((style & SWT.RIGHT_TO_LEFT) != 0) {
			bits1 |= OS.WS_EX_RIGHT | OS.WS_EX_RTLREADING;
			bits2 |= OS.ES_RIGHT;
		} else {
			bits1 &= ~(OS.WS_EX_RIGHT | OS.WS_EX_RTLREADING);
			bits2 &= ~OS.ES_RIGHT;
		}
		OS.SetWindowLong (hwndText, OS.GWL_EXSTYLE, bits1);
		OS.SetWindowLong (hwndText, OS.GWL_STYLE, bits2);
		/*
		* Bug in Windows.  For some reason, the single line text field
		* portion of the combo box does not redraw to reflect the new
		* style bits.  The fix is to force the widget to be resized by
		* temporarily shrinking and then growing the width and height.
		*/
		RECT rect = new RECT ();
		OS.GetWindowRect (hwndText, rect);
		int width = rect.right - rect.left, height = rect.bottom - rect.top;
		OS.GetWindowRect (handle, rect);
		int widthCombo = rect.right - rect.left, heightCombo = rect.bottom - rect.top;
		int uFlags = OS.SWP_NOMOVE | OS.SWP_NOZORDER | OS.SWP_NOACTIVATE;
		SetWindowPos (hwndText, 0, 0, 0, width - 1, height - 1, uFlags);
		SetWindowPos (handle, 0, 0, 0, widthCombo - 1, heightCombo - 1, uFlags);
		SetWindowPos (hwndText, 0, 0, 0, width, height, uFlags);
		SetWindowPos (handle, 0, 0, 0, widthCombo, heightCombo, uFlags);
		OS.InvalidateRect (handle, null, true);
	}	
	if (hwndList != 0) {
		int bits1 = OS.GetWindowLong (hwndList, OS.GWL_EXSTYLE);		
		if ((style & SWT.RIGHT_TO_LEFT) != 0) {
			bits1 |= OS.WS_EX_LAYOUTRTL;
		} else {
			bits1 &= ~OS.WS_EX_LAYOUTRTL;
		}
		OS.SetWindowLong (hwndList, OS.GWL_EXSTYLE, bits1);
	}
}

Sets the orientation of the receiver, which must be one of the constants SWT.LEFT_TO_RIGHT or SWT.RIGHT_TO_LEFT.

  void setScrollWidth() 
{
	int newWidth = 0;
	RECT rect = new RECT ();
	int /*long*/ newFont, oldFont = 0;
	int /*long*/ hDC = OS.GetDC (handle);
	newFont = OS.SendMessage (handle, OS.WM_GETFONT, 0, 0);
	if (newFont != 0) oldFont = OS.SelectObject (hDC, newFont);
	int cp = getCodePage ();
	int count = (int)/*64*/OS.SendMessage (handle, OS.CB_GETCOUNT, 0, 0);
	int flags = OS.DT_CALCRECT | OS.DT_SINGLELINE | OS.DT_NOPREFIX;
	for (int i=0; i< count; i++) {
		int length = (int)/*64*/OS.SendMessage (handle, OS.CB_GETLBTEXTLEN, i, 0);
		if (length != OS.CB_ERR) {
			TCHAR buffer = new TCHAR (cp, length + 1);
			int result = (int)/*64*/OS.SendMessage (handle, OS.CB_GETLBTEXT, i, buffer);
			if (result != OS.CB_ERR) {
				OS.DrawText (hDC, buffer, -1, rect, flags);
				newWidth = Math.max (newWidth, rect.right - rect.left);
			}
		}
	}
	if (newFont != 0) OS.SelectObject (hDC, oldFont);
	OS.ReleaseDC (handle, hDC);
	setScrollWidth (newWidth + 3);
}

  void setScrollWidth(int scrollWidth) 
{
	this.scrollWidth = scrollWidth;
	if ((style & SWT.SIMPLE) != 0) {
		OS.SendMessage (handle, OS.CB_SETHORIZONTALEXTENT, scrollWidth, 0);
		return;
	}
	boolean scroll = false;
	int count = (int)/*64*/OS.SendMessage (handle, OS.CB_GETCOUNT, 0, 0);
	if (count  > 3) {
		int maxWidth = 0;
		if (OS.IsWinCE || OS.WIN32_VERSION <  OS.VERSION (4, 10)) {
			RECT rect = new RECT ();
			OS.SystemParametersInfo (OS.SPI_GETWORKAREA, 0, rect, 0);
			maxWidth = (rect.right - rect.left) / 4;
		} else {
			int /*long*/ hmonitor = OS.MonitorFromWindow (handle, OS.MONITOR_DEFAULTTONEAREST);
			MONITORINFO lpmi = new MONITORINFO ();
			lpmi.cbSize = MONITORINFO.sizeof;
			OS.GetMonitorInfo (hmonitor, lpmi);
			maxWidth = (lpmi.rcWork_right - lpmi.rcWork_left) / 4;
		}
		scroll = scrollWidth  > maxWidth;
	}
	/*
	* Feature in Windows.  For some reason, in a editable combo box,
	* when CB_SETDROPPEDWIDTH is used to set the width of the drop
	* down list and the current text does not match an item in the
	* list, Windows selects the item that most closely matches the
	* contents of the combo.  The fix is to lock the current text
	* by ignoring all WM_SETTEXT messages during processing of
	* CB_SETDROPPEDWIDTH.
	*/
	if ((style & SWT.READ_ONLY) == 0) lockText = true;
	if (scroll) {
		OS.SendMessage (handle, OS.CB_SETDROPPEDWIDTH, 0, 0);
		OS.SendMessage (handle, OS.CB_SETHORIZONTALEXTENT, scrollWidth, 0);
	} else {
		scrollWidth += OS.GetSystemMetrics (OS.SM_CYHSCROLL);
		OS.SendMessage (handle, OS.CB_SETDROPPEDWIDTH, scrollWidth, 0);
		OS.SendMessage (handle, OS.CB_SETHORIZONTALEXTENT, 0, 0);
	}
	if ((style & SWT.READ_ONLY) == 0) lockText = false;
}

  void setScrollWidth(TCHAR buffer,
    boolean grow) 
{
	RECT rect = new RECT ();
	int /*long*/ newFont, oldFont = 0;
	int /*long*/ hDC = OS.GetDC (handle);
	newFont = OS.SendMessage (handle, OS.WM_GETFONT, 0, 0);
	if (newFont != 0) oldFont = OS.SelectObject (hDC, newFont);
	int flags = OS.DT_CALCRECT | OS.DT_SINGLELINE | OS.DT_NOPREFIX;
	OS.DrawText (hDC, buffer, -1, rect, flags);
	if (newFont != 0) OS.SelectObject (hDC, oldFont);
	OS.ReleaseDC (handle, hDC);
	setScrollWidth (rect.right - rect.left, grow);
}

  void setScrollWidth(int newWidth,
    boolean grow) 
{
	if (grow) {
		if (newWidth < = scrollWidth) return;
		setScrollWidth (newWidth + 3);
	} else {
		if (newWidth <  scrollWidth) return;
		setScrollWidth ();
	}
}

 public  void setSelection(Point selection) 
{
	checkWidget ();
	if (selection == null) error (SWT.ERROR_NULL_ARGUMENT);
	int start = selection.x, end = selection.y;
	if (!OS.IsUnicode && OS.IsDBLocale) {
		start = wcsToMbcsPos (start);
		end = wcsToMbcsPos (end);
	}
	int /*long*/ bits = OS.MAKELPARAM (start, end);
	OS.SendMessage (handle, OS.CB_SETEDITSEL, 0, bits);
}

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.

 public  void setText(String string) 
{
	checkWidget ();
	if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
	if ((style & SWT.READ_ONLY) != 0) {
		int index = indexOf (string);
		if (index != -1) select (index);
		return;
	}
	int limit = LIMIT;
	int /*long*/ hwndText = OS.GetDlgItem (handle, CBID_EDIT);
	if (hwndText != 0) {
		limit = (int)/*64*/OS.SendMessage (hwndText, OS.EM_GETLIMITTEXT, 0, 0) & 0x7FFFFFFF;
	}
	if (string.length ()  > limit) string = string.substring (0, limit);
	TCHAR buffer = new TCHAR (getCodePage (), string, true);
	if (OS.SetWindowText (handle, buffer)) {
		sendEvent (SWT.Modify);
		// widget could be disposed at this point
	}
}

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.

 public  void setTextLimit(int limit) 
{
	checkWidget ();
	if (limit == 0) error (SWT.ERROR_CANNOT_BE_ZERO);
	OS.SendMessage (handle, OS.CB_LIMITTEXT, limit, 0);
}

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.

  void setToolTipText(Shell shell,
    String string) 
{
	int /*long*/ hwndText = OS.GetDlgItem (handle, CBID_EDIT);
	int /*long*/ hwndList = OS.GetDlgItem (handle, CBID_LIST);
	if (hwndText != 0) shell.setToolTipText (hwndText, string);
	if (hwndList != 0) shell.setToolTipText (hwndList, string);
	shell.setToolTipText (handle, string);
}

 public  void setVisibleItemCount(int count) 
{
	checkWidget ();
	if (count <  0) return;
	visibleCount = count;
	if ((style & SWT.DROP_DOWN) != 0) {
		forceResize ();
		RECT rect = new RECT ();
		OS.GetWindowRect (handle, rect);
		int flags = OS.SWP_NOMOVE | OS.SWP_NOZORDER | OS.SWP_DRAWFRAME | OS.SWP_NOACTIVATE;
		setBounds (0, 0, rect.right - rect.left, rect.bottom - rect.top, flags);
	}
}

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.

  void subclass() 
{
	super.subclass ();
	int /*long*/ newProc = display.windowProc;
	int /*long*/ hwndText = OS.GetDlgItem (handle, CBID_EDIT);
	if (hwndText != 0) {
		OS.SetWindowLongPtr (hwndText, OS.GWLP_WNDPROC, newProc);
	}
	int /*long*/ hwndList = OS.GetDlgItem (handle, CBID_LIST);
	if (hwndList != 0) {	
		OS.SetWindowLongPtr (hwndList, OS.GWLP_WNDPROC, newProc);
	}
}

 boolean translateTraversal(MSG msg) 
{
	/*
	* When the combo box is dropped down, allow return
	* to select an item in the list and escape to close
	* the combo box.
	*/
	switch ((int)/*64*/(msg.wParam)) {
		case OS.VK_RETURN:
		case OS.VK_ESCAPE:
			if ((style & SWT.DROP_DOWN) != 0) {
				if (OS.SendMessage (handle, OS.CB_GETDROPPEDSTATE, 0, 0) != 0) {
					return false;
				}
			}
	}
	return super.translateTraversal (msg);
}

 boolean traverseEscape() 
{
	if ((style & SWT.DROP_DOWN) != 0) {
		if (OS.SendMessage (handle, OS.CB_GETDROPPEDSTATE, 0, 0) != 0) {
			OS.SendMessage (handle, OS.CB_SHOWDROPDOWN, 0, 0);
			return true;
		}
	}
	return super.traverseEscape ();
}

 boolean traverseReturn() 
{
	if ((style & SWT.DROP_DOWN) != 0) {
		if (OS.SendMessage (handle, OS.CB_GETDROPPEDSTATE, 0, 0) != 0) {
			OS.SendMessage (handle, OS.CB_SHOWDROPDOWN, 0, 0);
			return true;
		}
	}
	return super.traverseReturn ();
}

  void unsubclass() 
{
	super.unsubclass ();
	int /*long*/ hwndText = OS.GetDlgItem (handle, CBID_EDIT);
	if (hwndText != 0 && EditProc != 0) {
		OS.SetWindowLongPtr (hwndText, OS.GWLP_WNDPROC, EditProc);
	}
	int /*long*/ hwndList = OS.GetDlgItem (handle, CBID_LIST);
	if (hwndList != 0 && ListProc != 0) {
		OS.SetWindowLongPtr (hwndList, OS.GWLP_WNDPROC, ListProc);
	}
}

 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 != null) {
		event.character = keyEvent.character;
		event.keyCode = keyEvent.keyCode;
		event.stateMask = keyEvent.stateMask;
	}
	if (!OS.IsUnicode && OS.IsDBLocale) {
		event.start = mbcsToWcsPos (start);
		event.end = mbcsToWcsPos (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;
}

 int wcsToMbcsPos(int wcsPos) 
{
	if (wcsPos < = 0) return 0;
	if (OS.IsUnicode) return wcsPos;
	int /*long*/ hwndText = OS.GetDlgItem (handle, CBID_EDIT);
	if (hwndText == 0) return wcsPos;
	int mbcsSize = OS.GetWindowTextLengthA (hwndText);
	if (mbcsSize == 0) return 0;
	byte [] buffer = new byte [mbcsSize + 1];
	OS.GetWindowTextA (hwndText, buffer, mbcsSize + 1);
	int mbcsPos = 0, wcsCount = 0;
	while (mbcsPos <  mbcsSize) {
		if (wcsPos == wcsCount) break;
		if (OS.IsDBCSLeadByte (buffer [mbcsPos++])) mbcsPos++;
		wcsCount++;
	}
	return mbcsPos;
}

 int widgetExtStyle() 
{
	return super.widgetExtStyle () & ~OS.WS_EX_NOINHERITLAYOUT;
}

 int widgetStyle() 
{
	int bits = super.widgetStyle () | OS.CBS_AUTOHSCROLL | OS.CBS_NOINTEGRALHEIGHT | OS.WS_HSCROLL |OS.WS_VSCROLL;
	if ((style & SWT.SIMPLE) != 0) return bits | OS.CBS_SIMPLE;
	if ((style & SWT.READ_ONLY) != 0) return bits | OS.CBS_DROPDOWNLIST;
	return bits | OS.CBS_DROPDOWN;
}

 TCHAR windowClass() 
{
	return ComboClass;
}

 int windowProc() 
{
	return ComboProc;
}

 int windowProc(int hwnd,
    int msg,
    int wParam,
    int lParam) 
{
	if (handle == 0) return 0;
	if (hwnd != handle) {
		int /*long*/ hwndText = OS.GetDlgItem (handle, CBID_EDIT);
		int /*long*/ hwndList = OS.GetDlgItem (handle, CBID_LIST);
		if ((hwndText != 0 && hwnd == hwndText) || (hwndList != 0 && hwnd == hwndList)) {
			LRESULT result = null;
			switch (msg) {
				/* Keyboard messages */
				case OS.WM_CHAR:		result = wmChar (hwnd, wParam, lParam); break;
				case OS.WM_IME_CHAR:	result = wmIMEChar (hwnd, wParam, lParam); break;
				case OS.WM_KEYDOWN:		result = wmKeyDown (hwnd, wParam, lParam); break;
				case OS.WM_KEYUP:		result = wmKeyUp (hwnd, wParam, lParam); break;
				case OS.WM_SYSCHAR:		result = wmSysChar (hwnd, wParam, lParam); break;
				case OS.WM_SYSKEYDOWN:	result = wmSysKeyDown (hwnd, wParam, lParam); break;
				case OS.WM_SYSKEYUP:	result = wmSysKeyUp (hwnd, wParam, lParam); break;
				/* Mouse Messages */
				case OS.WM_CAPTURECHANGED:	result = wmCaptureChanged (hwnd, wParam, lParam); break;
				case OS.WM_LBUTTONDBLCLK:	result = wmLButtonDblClk (hwnd, wParam, lParam); break;
				case OS.WM_LBUTTONDOWN:		result = wmLButtonDown (hwnd, wParam, lParam); break;
				case OS.WM_LBUTTONUP:		result = wmLButtonUp (hwnd, wParam, lParam); break;
				case OS.WM_MBUTTONDBLCLK:	result = wmMButtonDblClk (hwnd, wParam, lParam); break;
				case OS.WM_MBUTTONDOWN:		result = wmMButtonDown (hwnd, wParam, lParam); break;
				case OS.WM_MBUTTONUP:		result = wmMButtonUp (hwnd, wParam, lParam); break;
				case OS.WM_MOUSEHOVER:		result = wmMouseHover (hwnd, wParam, lParam); break;
				case OS.WM_MOUSELEAVE:		result = wmMouseLeave (hwnd, wParam, lParam); break;
				case OS.WM_MOUSEMOVE:		result = wmMouseMove (hwnd, wParam, lParam); break;
//				case OS.WM_MOUSEWHEEL:		result = wmMouseWheel (hwnd, wParam, lParam); break;
				case OS.WM_RBUTTONDBLCLK:	result = wmRButtonDblClk (hwnd, wParam, lParam); break;
				case OS.WM_RBUTTONDOWN:		result = wmRButtonDown (hwnd, wParam, lParam); break;
				case OS.WM_RBUTTONUP:		result = wmRButtonUp (hwnd, wParam, lParam); break;
				case OS.WM_XBUTTONDBLCLK:	result = wmXButtonDblClk (hwnd, wParam, lParam); break;
				case OS.WM_XBUTTONDOWN:		result = wmXButtonDown (hwnd, wParam, lParam); break;
				case OS.WM_XBUTTONUP:		result = wmXButtonUp (hwnd, wParam, lParam); break;
				/* Paint messages */
				case OS.WM_PAINT:			result = wmPaint (hwnd, wParam, lParam); break;
				/* Menu messages */
				case OS.WM_CONTEXTMENU:		result = wmContextMenu (hwnd, wParam, lParam); break;
				/* Clipboard messages */
				case OS.WM_CLEAR:
				case OS.WM_CUT:
				case OS.WM_PASTE:
				case OS.WM_UNDO:
				case OS.EM_UNDO:
				case OS.WM_SETTEXT:
					if (hwnd == hwndText) {
						result = wmClipboard (hwnd, msg, wParam, lParam);
					}
					break;
			}
			if (result != null) return result.value;
			return callWindowProc (hwnd, msg, wParam, lParam);
		}
	}
	if (msg == OS.CB_SETCURSEL) {
		if ((style & SWT.READ_ONLY) != 0) {
			if (hooks (SWT.Verify) || filters (SWT.Verify)) {
				String oldText = getText (), newText = null;
				if (wParam == -1) {
					newText = "";
				} else {
					if (0 < = wParam && wParam <  getItemCount ()) {
						newText = getItem ((int)/*64*/wParam);
					}
				}
				if (newText != null && !newText.equals (oldText)) {
					int length = OS.GetWindowTextLength (handle);
					oldText = newText;
					newText = verifyText (newText, 0, length, null);
					if (newText == null) return 0;
					if (!newText.equals (oldText)) {
						int index = indexOf (newText);
						if (index != -1 && index != wParam) {
							return callWindowProc (handle, OS.CB_SETCURSEL, index, lParam);
						}
					}
				}
			}
		}
	}
	return super.windowProc (hwnd, msg, wParam, lParam);
}

 LRESULT wmChar(int hwnd,
    int wParam,
    int lParam) 
{
	if (ignoreCharacter) return null;
	LRESULT result = super.wmChar (hwnd, wParam, lParam);
	if (result != null) return result;
	/*
	* Feature in Windows.  For some reason, when the
	* widget is a single line text widget, when the
	* user presses tab, return or escape, Windows beeps.
	* The fix is to look for these keys and not call
	* the window proc.
	* 
	* NOTE: This only happens when the drop down list
	* is not visible.
	*/
	switch ((int)/*64*/wParam) {
		case SWT.TAB: return LRESULT.ZERO;
		case SWT.CR:
			if (!ignoreDefaultSelection) postEvent (SWT.DefaultSelection);
			ignoreDefaultSelection = false;
			// FALL THROUGH
		case SWT.ESC:
			if ((style & SWT.DROP_DOWN) != 0) {
				if (OS.SendMessage (handle, OS.CB_GETDROPPEDSTATE, 0, 0) == 0) {
					return LRESULT.ZERO;
				}
			}
	}
	return result;
}

 LRESULT wmClipboard(int hwndText,
    int msg,
    int wParam,
    int lParam) 
{
	if ((style & SWT.READ_ONLY) != 0) return null;
	if (!hooks (SWT.Verify) && !filters (SWT.Verify)) return null;
	boolean call = false;
	int [] start = new int [1], end = new int [1];
	String newText = null;
	switch (msg) {
		case OS.WM_CLEAR:
		case OS.WM_CUT:
			OS.SendMessage (hwndText, OS.EM_GETSEL, start, end);
			if (start [0] != end [0]) {
				newText = "";
				call = true;
			}
			break;
		case OS.WM_PASTE:
			OS.SendMessage (hwndText, OS.EM_GETSEL, start, end);
			newText = getClipboardText ();
			break;
		case OS.EM_UNDO:
		case OS.WM_UNDO:
			if (OS.SendMessage (hwndText, OS.EM_CANUNDO, 0, 0) != 0) {
				ignoreModify = true;
				OS.CallWindowProc (EditProc, hwndText, msg, wParam, lParam);
				int length = OS.GetWindowTextLength (hwndText);
				int [] newStart = new int [1], newEnd = new int [1];
				OS.SendMessage (hwndText, OS.EM_GETSEL, newStart, newEnd);
				if (length != 0 && newStart [0] != newEnd [0]) {
					TCHAR buffer = new TCHAR (getCodePage (), length + 1);
					OS.GetWindowText (hwndText, buffer, length + 1);
					newText = buffer.toString (newStart [0], newEnd [0] - newStart [0]);
				} else {
					newText = "";
				}
				OS.CallWindowProc (EditProc, hwndText, msg, wParam, lParam);
				OS.SendMessage (hwndText, OS.EM_GETSEL, start, end);
				ignoreModify = false;
			}
			break;
		case OS.WM_SETTEXT:
			end [0] = OS.GetWindowTextLength (hwndText);
			int length = OS.IsUnicode ? OS.wcslen (lParam) : OS.strlen (lParam);
			TCHAR buffer = new TCHAR (getCodePage (), length);
			int byteCount = buffer.length () * TCHAR.sizeof;
			OS.MoveMemory (buffer, lParam, byteCount);
			newText = buffer.toString (0, length);
			break;
	}
	if (newText != null) {
		String oldText = newText;
		newText = verifyText (newText, start [0], end [0], null);
		if (newText == null) return LRESULT.ZERO;
		if (!newText.equals (oldText)) {
			if (call) {
				OS.CallWindowProc (EditProc, hwndText, msg, wParam, lParam);
			}
			TCHAR buffer = new TCHAR (getCodePage (), newText, true);
			if (msg == OS.WM_SETTEXT) {
				int /*long*/ hHeap = OS.GetProcessHeap ();
				int byteCount = buffer.length () * TCHAR.sizeof;
				int /*long*/ pszText = OS.HeapAlloc (hHeap, OS.HEAP_ZERO_MEMORY, byteCount);
				OS.MoveMemory (pszText, buffer, byteCount); 
				int /*long*/ code = OS.CallWindowProc (EditProc, hwndText, msg, wParam, pszText);
				OS.HeapFree (hHeap, 0, pszText);
				return new LRESULT (code);
			} else {
				OS.SendMessage (hwndText, OS.EM_REPLACESEL, 0, buffer);
				return LRESULT.ZERO;
			}
		}
	}
	return null;
}

 LRESULT wmCommandChild(int wParam,
    int lParam) 
{
	int code = OS.HIWORD (wParam);
	switch (code) {
		case OS.CBN_EDITCHANGE:
			if (ignoreModify) break;
			/*
			* Feature in Windows.  If the combo box list selection is
			* queried using CB_GETCURSEL before the WM_COMMAND (with
			* CBN_EDITCHANGE) returns, CB_GETCURSEL returns the previous
			* selection in the list.  It seems that the combo box sends
			* the WM_COMMAND before it makes the selection in the list box
			* match the entry field.  The fix is remember that no selection
			* in the list should exist in this case.
			*/
			noSelection = true;
			sendEvent (SWT.Modify);
			if (isDisposed ()) return LRESULT.ZERO;
			noSelection = false;
			break;
		case OS.CBN_SELCHANGE:
			/*
			* Feature in Windows.  If the text in an editable combo box
			* is queried using GetWindowText () before the WM_COMMAND
			* (with CBN_SELCHANGE) returns, GetWindowText () returns is
			* the previous text in the combo box.  It seems that the combo
			* box sends the WM_COMMAND before it updates the text field to
			* match the list selection.  The fix is to force the text field
			* to match the list selection by re-selecting the list item.
			*/
			int index = (int)/*64*/OS.SendMessage (handle, OS.CB_GETCURSEL, 0, 0);
			if (index != OS.CB_ERR) {
				OS.SendMessage (handle, OS.CB_SETCURSEL, index, 0);
			}
			/*
			* It is possible (but unlikely), that application
			* code could have disposed the widget in the modify
			* event.  If this happens, end the processing of the
			* Windows message by returning zero as the result of
			* the window proc.
			*/
			sendEvent (SWT.Modify);
			if (isDisposed ()) return LRESULT.ZERO;
			postEvent (SWT.Selection);
			break;
		case OS.CBN_SETFOCUS:
			sendFocusEvent (SWT.FocusIn);
			if (isDisposed ()) return LRESULT.ZERO;
			break;
		case OS.CBN_KILLFOCUS:
			/*
			* Bug in Windows.  When a combo box that is read only
			* is disposed in CBN_KILLFOCUS, Windows segment faults.
			* The fix is to send focus from WM_KILLFOCUS instead
			* of CBN_KILLFOCUS.
			* 
			* NOTE: In version 6 of COMCTL32.DLL, the bug is fixed.
			*/
			if ((style & SWT.READ_ONLY) != 0) break;
			sendFocusEvent (SWT.FocusOut);
			if (isDisposed ()) return LRESULT.ZERO;
			break;
	}
	return super.wmCommandChild (wParam, lParam);
}

 LRESULT wmIMEChar(int hwnd,
    int wParam,
    int lParam) 
{
	/* Process a DBCS character */
	Display display = this.display;
	display.lastKey = 0;
	display.lastAscii = (int)/*64*/wParam;
	display.lastVirtual = display.lastNull = display.lastDead = false;
	if (!sendKeyEvent (SWT.KeyDown, OS.WM_IME_CHAR, wParam, lParam)) {
		return LRESULT.ZERO;
	}
	/*
	* Feature in Windows.  The Windows text widget uses
	* two 2 WM_CHAR's to process a DBCS key instead of
	* using WM_IME_CHAR.  The fix is to allow the text
	* widget to get the WM_CHAR's but ignore sending
	* them to the application.
	*/
	ignoreCharacter = true;
	int /*long*/ result = callWindowProc (hwnd, OS.WM_IME_CHAR, wParam, lParam);
	MSG msg = new MSG ();
	int flags = OS.PM_REMOVE | OS.PM_NOYIELD | OS.PM_QS_INPUT | OS.PM_QS_POSTMESSAGE;
	while (OS.PeekMessage (msg, hwnd, OS.WM_CHAR, OS.WM_CHAR, flags)) {
		OS.TranslateMessage (msg);
		OS.DispatchMessage (msg);
	}
	ignoreCharacter = false;
	sendKeyEvent (SWT.KeyUp, OS.WM_IME_CHAR, wParam, lParam);
	// widget could be disposed at this point
	display.lastKey = display.lastAscii = 0;
	return new LRESULT (result);
}

 LRESULT wmKeyDown(int hwnd,
    int wParam,
    int lParam) 
{
	if (ignoreCharacter) return null;
	LRESULT result = super.wmKeyDown (hwnd, wParam, lParam);
	if (result != null) return result;
	ignoreDefaultSelection = false;
	if (wParam == OS.VK_RETURN) {
		if ((style & SWT.DROP_DOWN) != 0) {
			if (OS.SendMessage (handle, OS.CB_GETDROPPEDSTATE, 0, 0) != 0) {
				ignoreDefaultSelection = true;
			}
		}
	}
	return result;
}

 LRESULT wmSysKeyDown(int hwnd,
    int wParam,
    int lParam) 
{
	/*
	* Feature in Windows.  When an editable combo box is dropped
	* down using Alt+Down and the text in the entry field partially
	* matches an item in the list, Windows selects the item but doesn't
	* send WM_COMMAND with CBN_SELCHANGE.  The fix is to detect that
	* the selection has changed and issue the notification.
	*/
	int oldSelection = (int)/*64*/OS.SendMessage (handle, OS.CB_GETCURSEL, 0, 0);
	LRESULT result = super.wmSysKeyDown (hwnd, wParam, lParam);
	if (result != null) return result;
	if ((style & SWT.READ_ONLY) == 0) {
		if (wParam == OS.VK_DOWN) {
			int /*long*/ code = callWindowProc (hwnd, OS.WM_SYSKEYDOWN, wParam, lParam);
			int newSelection = (int)/*64*/OS.SendMessage (handle, OS.CB_GETCURSEL, 0, 0);
			if (oldSelection != newSelection) {
				sendEvent (SWT.Modify);
				if (isDisposed ()) return LRESULT.ZERO;
				sendEvent (SWT.Selection);
				if (isDisposed ()) return LRESULT.ZERO;
			}
			return new LRESULT (code);
		}
	}
	return result;
}