/*******************************************************************************
 * 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
 *******************************************************************************/
package com.ibm.ccl.mapping.internal.ui.editor.viewmodes;

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.Image;
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;

/**
 * This code is a copy of the CCombo class that has been modified to allow 
 * for a customizable arrow image on the drop down box.  
 * See eclipse bug 217384 for more details. 
 */
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);

		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();
	}

	public void setArrowImage(Image image) {
		arrow.setImage(image);
	}
	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;
			}
		}
	}
}