package org.eclipse.wst.xsd.ui.internal.adt.design;

/*******************************************************************************
 * Copyright (c) 2000, 2006 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
 *******************************************************************************/
import org.eclipse.swt.SWT;
import org.eclipse.swt.SWTException;
import org.eclipse.swt.accessibility.ACC;
import org.eclipse.swt.accessibility.AccessibleAdapter;
import org.eclipse.swt.accessibility.AccessibleControlAdapter;
import org.eclipse.swt.accessibility.AccessibleControlEvent;
import org.eclipse.swt.accessibility.AccessibleEvent;
import org.eclipse.swt.accessibility.AccessibleTextAdapter;
import org.eclipse.swt.accessibility.AccessibleTextEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Layout;
import org.eclipse.swt.widgets.List;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
import org.eclipse.swt.widgets.TypedListener;
import org.eclipse.swt.widgets.Widget;
import org.eclipse.wst.xsd.ui.internal.editor.XSDEditorPlugin;

/**
 * The CCombo class represents a selectable user interface object
 * that combines a text field and a list and issues notification
 * when an item is selected from the list.
 * <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>
 * <dd>BORDER, READ_ONLY, FLAT</dd>
 * <dt><b>Events:</b>
 * <dd>Selection</dd>
 * </dl>
 */
public final class FlatCCombo extends Composite {

  Text text;
  List list;
  int visibleItemCount = 5;
  Shell popup;
  Label arrow;
  boolean hasFocus;
  Listener listener, filter;
  Color foreground, background;
  Font font;
  
/**
 * Constructs a new instance of this class given its parent
 * and a style value describing its behavior and appearance.
 * <p>
 * The style value is either one of the style constants defined in
 * class <code>SWT</code> which is applicable to instances of this
 * class, or must be built by <em>bitwise OR</em>'ing together 
 * (that is, using the <code>int</code> "|" operator) two or more
 * of those <code>SWT</code> style constants. The class description
 * lists the style constants that are applicable to the class.
 * Style bits are also inherited from superclasses.
 * </p>
 *
 * @param parent a widget which will be the parent of the new instance (cannot be null)
 * @param style the style of widget to construct
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
 * </ul>
 *
 * @see SWT#BORDER
 * @see SWT#READ_ONLY
 * @see SWT#FLAT
 * @see Widget#getStyle()
 */
public FlatCCombo (Composite parent, int style) {
  super (parent, style = checkStyle (style));
  
  int textStyle = SWT.SINGLE;
  if ((style & SWT.READ_ONLY) != 0) textStyle |= SWT.READ_ONLY;
  if ((style & SWT.FLAT) != 0) textStyle |= SWT.FLAT;
  text = new Text (this, textStyle);
  int arrowStyle = SWT.ARROW | SWT.DOWN;
  if ((style & SWT.FLAT) != 0) arrowStyle |= SWT.FLAT;
  arrow = new Label(this, SWT.FLAT);
  arrow.setImage(XSDEditorPlugin.getXSDImage("icons/TriangleToolBar.gif")); //$NON-NLS-1$

  listener = new Listener () {
    public void handleEvent (Event event) {
      if (popup == event.widget) {
        popupEvent (event);
        return;
      }
      if (text == event.widget) {
        textEvent (event);
        return;
      }
      if (list == event.widget) {
        listEvent (event);
        return;
      }
      if (arrow == event.widget) {
        arrowEvent (event);
        return;
      }
      if (FlatCCombo.this == event.widget) {
        comboEvent (event);
        return;
      }
      if (getShell () == event.widget) {
        handleFocus (SWT.FocusOut);
      }
    }
  };
  filter = new Listener() {
    public void handleEvent(Event event) {
      Shell shell = ((Control)event.widget).getShell ();
      if (shell == FlatCCombo.this.getShell ()) {
        handleFocus (SWT.FocusOut);
      }
    }
  };
  
  int [] comboEvents = {SWT.Dispose, SWT.Move, SWT.Resize};
  for (int i=0; i<comboEvents.length; i++) this.addListener (comboEvents [i], listener);
  
  int [] textEvents = {SWT.KeyDown, SWT.KeyUp, SWT.MenuDetect, SWT.Modify, SWT.MouseDown, SWT.MouseUp, SWT.Traverse, SWT.FocusIn};
  for (int i=0; i<textEvents.length; i++) text.addListener (textEvents [i], listener);
  
  int [] arrowEvents = {SWT.MouseDown, SWT.Selection, SWT.FocusIn};
  for (int i=0; i<arrowEvents.length; i++) arrow.addListener (arrowEvents [i], listener);
  
  createPopup(null, -1);
  initAccessible();
}
static int checkStyle (int style) {
  int mask = SWT.BORDER | SWT.READ_ONLY | SWT.FLAT | SWT.LEFT_TO_RIGHT | SWT.RIGHT_TO_LEFT;
  return style & mask;
}
/**
 * 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 SWTException <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 == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
  list.add (string);
}
/**
 * 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 SWTException <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 == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
  list.add (string, 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 SWTException <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 == null) SWT.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 selection changes, by sending
 * it one of the messages defined in the <code>SelectionListener</code>
 * interface.
 * <p>
 * <code>widgetSelected</code> is called when the combo's list selection changes.
 * <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 SWTException <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 == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
  TypedListener typedListener = new TypedListener (listener);
  addListener (SWT.Selection,typedListener);
  addListener (SWT.DefaultSelection,typedListener);
}
void arrowEvent (Event event) {
  switch (event.type) {
    case SWT.FocusIn: {
      handleFocus (SWT.FocusIn);
      break;
    }
    case SWT.Selection: {
      dropDown (!isDropped ());
      break;
    }
    case SWT.MouseDown: {
      dropDown (!isDropped ());
      break;
    }
  }
}
/**
 * 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 SWTException <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 ();
  text.clearSelection ();
  list.deselectAll ();
}
void comboEvent (Event event) {
  switch (event.type) {
    case SWT.Dispose:
      if (popup != null && !popup.isDisposed ()) {
        list.removeListener (SWT.Dispose, listener);
        popup.dispose ();
      }
      Shell shell = getShell ();
      shell.removeListener (SWT.Deactivate, listener);
      Display display = getDisplay ();
      display.removeFilter (SWT.FocusIn, filter);
      popup = null;  
      text = null;  
      list = null;  
      arrow = null;
      break;
    case SWT.Move:
      dropDown (false);
      break;
    case SWT.Resize:
      internalLayout (false);
      break;
  }
}

public Point computeSize (int wHint, int hHint, boolean changed) {
  checkWidget ();
  int width = 0, height = 0;
  String[] items = list.getItems ();
  int textWidth = 0;
  GC gc = new GC (text);
  int spacer = gc.stringExtent (" ").x; //$NON-NLS-1$
  for (int i = 0; i < items.length; i++) {
    textWidth = Math.max (gc.stringExtent (items[i]).x, textWidth);
  }
  gc.dispose();
  Point textSize = text.computeSize (SWT.DEFAULT, SWT.DEFAULT, changed);
  // Point arrowSize = arrow.computeSize (SWT.DEFAULT, SWT.DEFAULT, changed);
  Point arrowSize = new Point(16, 16);
  Point listSize = list.computeSize (SWT.DEFAULT, SWT.DEFAULT, changed);
  int borderWidth = getBorderWidth ();
  
  height = Math.max (textSize.y, arrowSize.y);
  width = Math.max (textWidth + 2*spacer + arrowSize.x + 2*borderWidth, listSize.x);
  if (wHint != SWT.DEFAULT) width = wHint;
  if (hHint != SWT.DEFAULT) height = hHint;
  return new Point (width + 2*borderWidth, height + 2*borderWidth);
}
void createPopup(String[] items, int selectionIndex) {    
    // create shell and list
    popup = new Shell (getShell (), SWT.NO_TRIM | SWT.ON_TOP);
    int style = getStyle ();
    int listStyle = SWT.SINGLE | SWT.V_SCROLL;
    if ((style & SWT.FLAT) != 0) listStyle |= SWT.FLAT;
    if ((style & SWT.RIGHT_TO_LEFT) != 0) listStyle |= SWT.RIGHT_TO_LEFT;
    if ((style & SWT.LEFT_TO_RIGHT) != 0) listStyle |= SWT.LEFT_TO_RIGHT;
    list = new List (popup, listStyle);
    if (font != null) list.setFont (font);
    if (foreground != null) list.setForeground (foreground);
    if (background != null) list.setBackground (background);
    
    int [] popupEvents = {SWT.Close, SWT.Paint, SWT.Deactivate};
    for (int i=0; i<popupEvents.length; i++) popup.addListener (popupEvents [i], listener);
    int [] listEvents = {SWT.MouseUp, SWT.Selection, SWT.Traverse, SWT.KeyDown, SWT.KeyUp, SWT.FocusIn, SWT.Dispose};
    for (int i=0; i<listEvents.length; i++) list.addListener (listEvents [i], listener);
    
    if (items != null) list.setItems (items);
    if (selectionIndex != -1) list.setSelection (selectionIndex);
}
/**
 * Deselects the item at the given zero-relative index in the receiver's 
 * list.  If the item at the index was already deselected, it remains
 * deselected. Indices that are out of range are ignored.
 *
 * @param index the index of the item to deselect
 *
 * @exception SWTException <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 ();
  list.deselect (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 SWTException <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 ();
  list.deselectAll ();
}
void dropDown (boolean drop) {
  if (drop == isDropped ()) return;
  if (!drop) {
    popup.setVisible (false);
    if (!isDisposed ()&& arrow.isFocusControl()) {
      text.setFocus();
    }
    return;
  }

  if (getShell() != popup.getParent ()) {
    String[] items = list.getItems ();
    int selectionIndex = list.getSelectionIndex ();
    list.removeListener (SWT.Dispose, listener);
    popup.dispose();
    popup = null;
    list = null;
    createPopup (items, selectionIndex);
  }
  
  Point size = getSize ();
  int itemCount = list.getItemCount ();
  itemCount = (itemCount == 0) ? visibleItemCount : Math.min(visibleItemCount, itemCount);
  int itemHeight = list.getItemHeight () * itemCount;
  Point listSize = list.computeSize (SWT.DEFAULT, itemHeight, false);
  list.setBounds (1, 1, Math.max (size.x - 2, listSize.x), listSize.y);
  
  int index = list.getSelectionIndex ();
  if (index != -1) list.setTopIndex (index);
  Display display = getDisplay ();
  Rectangle listRect = list.getBounds ();
  Rectangle parentRect = display.map (getParent (), null, getBounds ());
  Point comboSize = getSize ();
  Rectangle displayRect = getMonitor ().getClientArea ();
  int width = Math.max (comboSize.x, listRect.width + 2);
  int height = listRect.height + 2;
  int x = parentRect.x;
  int y = parentRect.y + comboSize.y;
  if (y + height > displayRect.y + displayRect.height) y = parentRect.y - height;
  if (x + width > displayRect.x + displayRect.width) x = displayRect.x + displayRect.width - listRect.width;
  popup.setBounds (x, y, width, height);
  popup.setVisible (true);
  list.setFocus ();
}
/*
 * Return the lowercase of the first non-'&' character following
 * an '&' character in the given string. If there are no '&'
 * characters in the given string, return '\0'.
 */
char _findMnemonic (String string) {
  if (string == null) return '\0';
  int index = 0;
  int length = string.length ();
  do {
    while (index < length && string.charAt (index) != '&') index++;
    if (++index >= length) return '\0';
    if (string.charAt (index) != '&') return Character.toLowerCase (string.charAt (index));
    index++;
  } while (index < length);
  return '\0';
}
/* 
 * Return the Label immediately preceding the receiver in the z-order, 
 * or null if none. 
 */
Label getAssociatedLabel () {
  Control[] siblings = getParent ().getChildren ();
  for (int i = 0; i < siblings.length; i++) {
    if (siblings [i] == this) {
      if (i > 0 && siblings [i-1] instanceof Label) {
        return (Label) siblings [i-1];
      }
    }
  }
  return null;
}
public Control [] getChildren () {
  return super.getChildren();
}
/**
 * Gets the editable state.
 *
 * @return whether or not the receiver is editable
 * 
 * @exception SWTException <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 boolean getEditable () {
  checkWidget ();
  return text.getEditable();
}
/**
 * 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 SWTException <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();
  return list.getItem (index);
}
/**
 * Returns the number of items contained in the receiver's list.
 *
 * @return the number of items
 *
 * @exception SWTException <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 ();
  return list.getItemCount ();
}
/**
 * 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 SWTException <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 ();
  return list.getItemHeight ();
}
/**
 * Returns an 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 SWTException <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 ();
  return list.getItems ();
}
public Menu getMenu() {
  return text.getMenu();
}
/**
 * Returns a <code>Point</code> whose x coordinate is the start
 * of the selection in the receiver's text field, and whose y
 * coordinate is the end of the selection. The returned values
 * are zero-relative. An "empty" selection as indicated by
 * the the x and y coordinates having the same value.
 *
 * @return a point representing the selection start and end
 *
 * @exception SWTException <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 ();
  return text.getSelection ();
}
/**
 * Returns the zero-relative index of the item which is currently
 * selected in the receiver's list, or -1 if no item is selected.
 *
 * @return the index of the selected item
 *
 * @exception SWTException <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 ();
  return list.getSelectionIndex ();
}
public int getStyle () {
  int style = super.getStyle ();
  style &= ~SWT.READ_ONLY;
  if (!text.getEditable()) style |= SWT.READ_ONLY; 
  return style;
}
/**
 * Returns a string containing a copy of the contents of the
 * receiver's text field.
 *
 * @return the receiver's text
 *
 * @exception SWTException <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 text.getText ();
}
/**
 * Returns the height of the receivers's text field.
 *
 * @return the text height
 *
 * @exception SWTException <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 ();
  return text.getLineHeight ();
}
/**
 * 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 SWTException <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 getTextLimit () {
  checkWidget ();
  return text.getTextLimit ();
}
/**
 * Gets the number of items that are visible in the drop
 * down portion of the receiver's list.
 *
 * @return the number of items that are visible
 *
 * @exception SWTException <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 ();
  return visibleItemCount;
}
void handleFocus (int type) {
  if (isDisposed ()) return;
  switch (type) {
    case SWT.FocusIn: {
      if (hasFocus) return;
      if (getEditable ()) text.selectAll ();
      hasFocus = true;
      Shell shell = getShell ();
      shell.removeListener (SWT.Deactivate, listener);
      shell.addListener (SWT.Deactivate, listener);
      Display display = getDisplay ();
      display.removeFilter (SWT.FocusIn, filter);
      display.addFilter (SWT.FocusIn, filter);
      Event e = new Event ();
      notifyListeners (SWT.FocusIn, e);
      break;
    }
    case SWT.FocusOut: {
      if (!hasFocus) return;
      Control focusControl = getDisplay ().getFocusControl ();
      if (focusControl == arrow || focusControl == list || focusControl == text) return;
      hasFocus = false;
      Shell shell = getShell ();
      shell.removeListener(SWT.Deactivate, listener);
      Display display = getDisplay ();
      display.removeFilter (SWT.FocusIn, filter);
      Event e = new Event ();
      notifyListeners (SWT.FocusOut, e);
      break;
    }
  }
}
/**
 * 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 SWTException <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) {
  checkWidget ();
  if (string == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
  return list.indexOf (string);
}
/**
 * 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 SWTException <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 == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
  return list.indexOf (string, start);
}

void initAccessible() {
  AccessibleAdapter accessibleAdapter = new AccessibleAdapter () {
    public void getName (AccessibleEvent e) {
      String name = null;
      Label label = getAssociatedLabel ();
      if (label != null) {
        name = stripMnemonic (label.getText());
      }
      e.result = name;
    }
    public void getKeyboardShortcut(AccessibleEvent e) {
      String shortcut = null;
      Label label = getAssociatedLabel ();
      if (label != null) {
        String text = label.getText ();
        if (text != null) {
          char mnemonic = _findMnemonic (text);
          if (mnemonic != '\0') {
            shortcut = "Alt+"+mnemonic; //$NON-NLS-1$
          }
        }
      }
      e.result = shortcut;
    }
    public void getHelp (AccessibleEvent e) {
      e.result = getToolTipText ();
    }
  };
  getAccessible ().addAccessibleListener (accessibleAdapter);
  text.getAccessible ().addAccessibleListener (accessibleAdapter);
  list.getAccessible ().addAccessibleListener (accessibleAdapter);
  
  arrow.getAccessible ().addAccessibleListener (new AccessibleAdapter() {
    public void getName (AccessibleEvent e) {
      e.result = isDropped () ? SWT.getMessage ("SWT_Close") : SWT.getMessage ("SWT_Open"); //$NON-NLS-1$ //$NON-NLS-2$
    }
    public void getKeyboardShortcut (AccessibleEvent e) {
      e.result = "Alt+Down Arrow"; //$NON-NLS-1$
    }
    public void getHelp (AccessibleEvent e) {
      e.result = getToolTipText ();
    }
  });

  getAccessible().addAccessibleTextListener (new AccessibleTextAdapter() {
    public void getCaretOffset (AccessibleTextEvent e) {
      e.offset = text.getCaretPosition ();
    }
    public void getSelectionRange(AccessibleTextEvent e) {
      Point sel = text.getSelection();
      e.offset = sel.x;
      e.length = sel.y - sel.x;
    }
  });
  
  getAccessible().addAccessibleControlListener (new AccessibleControlAdapter() {
    public void getChildAtPoint (AccessibleControlEvent e) {
      Point testPoint = toControl (e.x, e.y);
      if (getBounds ().contains (testPoint)) {
        e.childID = ACC.CHILDID_SELF;
      }
    }
    
    public void getLocation (AccessibleControlEvent e) {
      Rectangle location = getBounds ();
      Point pt = toDisplay (location.x, location.y);
      e.x = pt.x;
      e.y = pt.y;
      e.width = location.width;
      e.height = location.height;
    }
    
    public void getChildCount (AccessibleControlEvent e) {
      e.detail = 0;
    }
    
    public void getRole (AccessibleControlEvent e) {
      e.detail = ACC.ROLE_COMBOBOX;
    }
    
    public void getState (AccessibleControlEvent e) {
      e.detail = ACC.STATE_NORMAL;
    }

    public void getValue (AccessibleControlEvent e) {
      e.result = getText ();
    }
  });

  text.getAccessible ().addAccessibleControlListener (new AccessibleControlAdapter () {
    public void getRole (AccessibleControlEvent e) {
      e.detail = text.getEditable () ? ACC.ROLE_TEXT : ACC.ROLE_LABEL;
    }
  });

  arrow.getAccessible ().addAccessibleControlListener (new AccessibleControlAdapter() {
    public void getDefaultAction (AccessibleControlEvent e) {
      e.result = isDropped () ? SWT.getMessage ("SWT_Close") : SWT.getMessage ("SWT_Open"); //$NON-NLS-1$ //$NON-NLS-2$
    }
  });
}
boolean isDropped () {
  return popup.getVisible ();
}
public boolean isFocusControl () {
  checkWidget();
  if (text.isFocusControl () || arrow.isFocusControl () || list.isFocusControl () || popup.isFocusControl ()) {
    return true;
  } 
  return super.isFocusControl ();
}
void internalLayout (boolean changed) {
  if (isDropped ()) dropDown (false);
  Rectangle rect = getClientArea ();
  int width = rect.width;
  int height = rect.height;
  // Point arrowSize = arrow.computeSize (SWT.DEFAULT, height, changed);
  // text.setBounds (0, 0, width - arrowSize.x, height);
  text.setBounds (0, 0, width - 16, height);
  // arrow.setBounds (width - arrowSize.x, 0, arrowSize.x, arrowSize.y);
  arrow.setBounds (width - 16, 0, 16, 16);
}
void listEvent (Event event) {
  switch (event.type) {
    case SWT.Dispose:
      if (getShell () != popup.getParent ()) {
        String[] items = list.getItems ();
        int selectionIndex = list.getSelectionIndex ();
        popup = null;
        list = null;
        createPopup (items, selectionIndex);
      }
      break;
    case SWT.FocusIn: {
      handleFocus (SWT.FocusIn);
      break;
    }
    case SWT.MouseUp: {
      if (event.button != 1) return;
      dropDown (false);
      break;
    }
    case SWT.Selection: {
      int index = list.getSelectionIndex ();
      if (index == -1) return;
      text.setText (list.getItem (index));
      text.selectAll ();
      list.setSelection (index);
      Event e = new Event ();
      e.time = event.time;
      e.stateMask = event.stateMask;
      e.doit = event.doit;
      notifyListeners (SWT.Selection, e);
      event.doit = e.doit;
      break;
    }
    case SWT.Traverse: {
      switch (event.detail) {
        case SWT.TRAVERSE_RETURN:
        case SWT.TRAVERSE_ESCAPE:
        case SWT.TRAVERSE_ARROW_PREVIOUS:
        case SWT.TRAVERSE_ARROW_NEXT:
          event.doit = false;
          break;
      }
      Event e = new Event ();
      e.time = event.time;
      e.detail = event.detail;
      e.doit = event.doit;
      e.character = event.character;
      e.keyCode = event.keyCode;
      notifyListeners (SWT.Traverse, e);
      event.doit = e.doit;
      event.detail = e.detail;
      break;
    }
    case SWT.KeyUp: {   
      Event e = new Event ();
      e.time = event.time;
      e.character = event.character;
      e.keyCode = event.keyCode;
      e.stateMask = event.stateMask;
      notifyListeners (SWT.KeyUp, e);
      break;
    }
    case SWT.KeyDown: {
      if (event.character == SWT.ESC) { 
        // Escape key cancels popup list
        dropDown (false);
      }
      if ((event.stateMask & SWT.ALT) != 0 && (event.keyCode == SWT.ARROW_UP || event.keyCode == SWT.ARROW_DOWN)) {
        dropDown (false);
      }
      if (event.character == SWT.CR) {
        // Enter causes default selection
        dropDown (false);
        Event e = new Event ();
        e.time = event.time;
        e.stateMask = event.stateMask;
        notifyListeners (SWT.DefaultSelection, e);
      }
      // At this point the widget may have been disposed.
      // If so, do not continue.
      if (isDisposed ()) break;
      Event e = new Event();
      e.time = event.time;
      e.character = event.character;
      e.keyCode = event.keyCode;
      e.stateMask = event.stateMask;
      notifyListeners(SWT.KeyDown, e);
      break;
      
    }
  }
}

void popupEvent(Event event) {
  switch (event.type) {
    case SWT.Paint:
      // draw black rectangle around list
      Rectangle listRect = list.getBounds();
      Color black = getDisplay().getSystemColor(SWT.COLOR_BLACK);
      event.gc.setForeground(black);
      event.gc.drawRectangle(0, 0, listRect.width + 1, listRect.height + 1);
      break;
    case SWT.Close:
      event.doit = false;
      dropDown (false);
      break;
    case SWT.Deactivate:
      dropDown (false);
      break;
  }
}
public void redraw () {
  super.redraw();
  text.redraw();
  arrow.redraw();
  if (popup.isVisible()) list.redraw();
}
public void redraw (int x, int y, int width, int height, boolean all) {
  super.redraw(x, y, width, height, true);
}

/**
 * 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 SWTException <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();
  list.remove (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 SWTException <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();
  list.remove (start, end);
}
/**
 * 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 SWTException <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 == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
  list.remove (string);
}
/**
 * Removes all of the items from the receiver's list and clear the
 * contents of receiver's text field.
 * <p>
 * @exception SWTException <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();
  text.setText (""); //$NON-NLS-1$
  list.removeAll ();
}
/**
 * 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 SWTException <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 == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
  removeListener(SWT.Modify, listener); 
}
/**
 * Removes the listener from the collection of listeners who will
 * be notified when the receiver's selection changes.
 *
 * @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 SWTException <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 == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
  removeListener(SWT.Selection, listener);
  removeListener(SWT.DefaultSelection,listener);  
}
/**
 * Selects the item at the given zero-relative index in the receiver's 
 * list.  If the item at the index was already selected, it remains
 * selected. Indices that are out of range are ignored.
 *
 * @param index the index of the item to select
 *
 * @exception SWTException <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();
  if (index == -1) {
    list.deselectAll ();
    text.setText (""); //$NON-NLS-1$
    return;
  }
  if (0 <= index && index < list.getItemCount()) {
    if (index != getSelectionIndex()) {
      text.setText (list.getItem (index));
      text.selectAll ();
      list.select (index);
      list.showSelection ();
    }
  }
}
public void setBackground (Color color) {
  super.setBackground(color);
  background = color;
  if (text != null) text.setBackground(color);
  if (list != null) list.setBackground(color);
  if (arrow != null) arrow.setBackground(color);
}
/**
 * Sets the editable state.
 *
 * @param editable the new editable state
 *
 * @exception SWTException <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 setEditable (boolean editable) {
  checkWidget ();
  text.setEditable(editable);
}
public void setEnabled (boolean enabled) {
  super.setEnabled(enabled);
  if (popup != null) popup.setVisible (false);
  if (text != null) text.setEnabled(enabled);
  if (arrow != null) arrow.setEnabled(enabled);
}
public boolean setFocus () {
  checkWidget();
  return text.setFocus ();
}
public void setFont (Font font) {
  super.setFont (font);
  this.font = font;
  text.setFont (font);
  list.setFont (font);
  internalLayout (true);
}
public void setForeground (Color color) {
  super.setForeground(color);
  foreground = color;
  if (text != null) text.setForeground(color);
  if (list != null) list.setForeground(color);
  if (arrow != null) arrow.setForeground(color);
}
/**
 * Sets the text of the item in the receiver's list at the given
 * zero-relative index to the string argument. This is equivalent
 * to <code>remove</code>'ing the old item at the index, and then
 * <code>add</code>'ing the new item at that index.
 *
 * @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 SWTException <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();
  list.setItem (index, string);
}
/**
 * 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 SWTException <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 ();
  list.setItems (items);
  if (!text.getEditable ()) text.setText (""); //$NON-NLS-1$
}
/**
 * Sets the layout which is associated with the receiver to be
 * the argument which may be null.
 * <p>
 * Note: No Layout can be set on this Control because it already
 * manages the size and position of its children.
 * </p>
 *
 * @param layout the receiver's new layout or null
 *
 * @exception SWTException <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 setLayout (Layout layout) {
  checkWidget ();
  return;
}
public void setMenu(Menu menu) {
  text.setMenu(menu);
}
/**
 * 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 SWTException <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 == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
  text.setSelection (selection.x, selection.y);
}

/**
 * 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 SWTException <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 == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
  int index = list.indexOf (string);
  if (index == -1) {
    list.deselectAll ();
    text.setText (string);
    return;
  }
  text.setText (string);
  text.selectAll ();
  list.setSelection (index);
  list.showSelection ();
}
/**
 * Sets the maximum number of characters that the receiver's
 * text field is capable of holding to be the argument.
 *
 * @param limit new text limit
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_CANNOT_BE_ZERO - if the limit is zero</li>
 * </ul>
 * @exception SWTException <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 setTextLimit (int limit) {
  checkWidget();
  text.setTextLimit (limit);
}

public void setToolTipText (String string) {
  checkWidget();
  super.setToolTipText(string);
  arrow.setToolTipText (string);
  text.setToolTipText (string);   
}

public void setVisible (boolean visible) {
  super.setVisible(visible);
  if (!visible) popup.setVisible(false);
}
/**
 * Sets the number of items that are visible in the drop
 * down portion of the receiver's list.
 *
 * @param count the new number of items to be visible
 *
 * @exception SWTException <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;
  visibleItemCount = count;
}
String stripMnemonic (String string) {
  int index = 0;
  int length = string.length ();
  do {
    while ((index < length) && (string.charAt (index) != '&')) index++;
    if (++index >= length) return string;
    if (string.charAt (index) != '&') {
      return string.substring(0, index-1) + string.substring(index, length);
    }
    index++;
  } while (index < length);
  return string;
}
void textEvent (Event event) {
  switch (event.type) {
    case SWT.FocusIn: {
      handleFocus (SWT.FocusIn);
      break;
    }
    case SWT.KeyDown: {
      if (event.character == SWT.CR) {
        dropDown (false);
        Event e = new Event ();
        e.time = event.time;
        e.stateMask = event.stateMask;
        notifyListeners (SWT.DefaultSelection, e);
      }
      //At this point the widget may have been disposed.
      // If so, do not continue.
      if (isDisposed ()) break;
      
      if (event.keyCode == SWT.ARROW_UP || event.keyCode == SWT.ARROW_DOWN) {
        event.doit = false;
        if ((event.stateMask & SWT.ALT) != 0) {
          boolean dropped = isDropped ();
          text.selectAll ();
          if (!dropped) setFocus ();
          dropDown (!dropped);
          break;
        }

        int oldIndex = getSelectionIndex ();
        if (event.keyCode == SWT.ARROW_UP) {
          select (Math.max (oldIndex - 1, 0));
        } else {
          select (Math.min (oldIndex + 1, getItemCount () - 1));
        }
        if (oldIndex != getSelectionIndex ()) {
          Event e = new Event();
          e.time = event.time;
          e.stateMask = event.stateMask;
          notifyListeners (SWT.Selection, e);
        }
        //At this point the widget may have been disposed.
        // If so, do not continue.
        if (isDisposed ()) break;
      }
      
      // Further work : Need to add support for incremental search in 
      // pop up list as characters typed in text widget
            
      Event e = new Event ();
      e.time = event.time;
      e.character = event.character;
      e.keyCode = event.keyCode;
      e.stateMask = event.stateMask;
      notifyListeners (SWT.KeyDown, e);
      break;
    }
    case SWT.KeyUp: {
      Event e = new Event ();
      e.time = event.time;
      e.character = event.character;
      e.keyCode = event.keyCode;
      e.stateMask = event.stateMask;
      notifyListeners (SWT.KeyUp, e);
      break;
    }
    case SWT.MenuDetect: {
      Event e = new Event ();
      e.time = event.time;
      notifyListeners (SWT.MenuDetect, e);
      break;
    }
    case SWT.Modify: {
      list.deselectAll ();
      Event e = new Event ();
      e.time = event.time;
      notifyListeners (SWT.Modify, e);
      break;
    }
    case SWT.MouseDown: {
      if (event.button != 1) return;
      if (text.getEditable ()) return;
      boolean dropped = isDropped ();
      text.selectAll ();
      if (!dropped) setFocus ();
      dropDown (!dropped);
      break;
    }
    case SWT.MouseUp: {
      if (event.button != 1) return;
      if (text.getEditable ()) return;
      text.selectAll ();
      break;
    }
    case SWT.Traverse: {    
      switch (event.detail) {
        case SWT.TRAVERSE_RETURN:
        case SWT.TRAVERSE_ARROW_PREVIOUS:
        case SWT.TRAVERSE_ARROW_NEXT:
          // The enter causes default selection and
          // the arrow keys are used to manipulate the list contents so
          // do not use them for traversal.
          event.doit = false;
          break;
      }
      
      Event e = new Event ();
      e.time = event.time;
      e.detail = event.detail;
      e.doit = event.doit;
      e.character = event.character;
      e.keyCode = event.keyCode;
      notifyListeners (SWT.Traverse, e);
      event.doit = e.doit;
      event.detail = e.detail;
      break;
    }
  }
}
}