/*******************************************************************************
 * Copyright (c) 2006 Sybase, Inc. 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:
 *     Sybase, Inc. - initial API and implementation
 *******************************************************************************/
package org.eclipse.jst.jsf.common.ui.internal.utils;

import java.util.Arrays;

import org.eclipse.jface.resource.JFaceResources;
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.Button;
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.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.swt.widgets.TableItem;
import org.eclipse.swt.widgets.Text;
import org.eclipse.swt.widgets.TypedListener;
import org.eclipse.swt.widgets.Widget;

/**
 * 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 StyleCombo extends Composite {

	Text text;

	Table table;

	int visibleItemCount = 4;

	Shell popup;

	Button arrow;

	boolean hasFocus;

	Listener listener, filter;

	Color foreground, background;

	Font font;

	String defaultValue;

	/**
	 * 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 org.eclipse.swt.org.eclipse.swt.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 StyleCombo(Composite parent, int style) {
		super(parent, style = checkStyle(style));

		listener = new Listener() {
			public void handleEvent(Event event) {
				if (popup == event.widget) {
					popupEvent(event);
					return;
				}
				if (text == event.widget) {
					textEvent(event);
					return;
				}
				if (table == event.widget) {
					tableEvent(event);
					return;
				}
				if (arrow == event.widget) {
					arrowEvent(event);
					return;
				}
				if (StyleCombo.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 == StyleCombo.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);

		createText(style);
		createArrow(style);

		createPopup(null, -1);
		initAccessible();
	}

	/**
	 * @param style
	 */
	private void createArrow(int style) {
		int arrowStyle = SWT.ARROW | SWT.DOWN;
		if ((style & SWT.FLAT) != 0) {
			arrowStyle |= SWT.FLAT;
		}
		arrow = new Button(this, arrowStyle);
		int[] arrowEvents = { SWT.Selection, SWT.FocusIn };
		for (int i = 0; i < arrowEvents.length; i++) {
			arrow.addListener(arrowEvents[i], listener);
		}
	}

	/**
	 * @param style
	 */
	private void createText(int 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[] textEvents = { SWT.KeyDown, SWT.KeyUp, SWT.Modify, SWT.MouseDown,
				SWT.MouseUp, SWT.Traverse, SWT.FocusIn };
		for (int i = 0; i < textEvents.length; i++) {
			text.addListener(textEvents[i], listener);
		}
	}

	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 org.eclipse.swt.org.eclipse.swt.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);
		}
		TableItem item = new TableItem(table, SWT.NONE);
		item.setText(0, 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 org.eclipse.swt.org.eclipse.swt.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);
		}
		TableItem item = new TableItem(table, SWT.NONE, index);
		item.setText(0, string);
	}

	/**
	 * 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 listener1
	 *            the listener which should be notified
	 * 
	 * @exception IllegalArgumentException
	 *                <ul>
	 *                <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
	 *                </ul>
	 * @exception org.eclipse.swt.org.eclipse.swt.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 listener1) {
		checkWidget();
		if (listener1 == null) {
			SWT.error(SWT.ERROR_NULL_ARGUMENT);
		}
		TypedListener typedListener = new TypedListener(listener1);
		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 listener1
	 *            the listener which should be notified
	 * 
	 * @exception IllegalArgumentException
	 *                <ul>
	 *                <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
	 *                </ul>
	 * @exception org.eclipse.swt.org.eclipse.swt.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 listener1) {
		checkWidget();
		if (listener1 == null) {
			SWT.error(SWT.ERROR_NULL_ARGUMENT);
		}
		TypedListener typedListener = new TypedListener(listener1);
		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;
		}
		}
	}

	/**
	 * 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 org.eclipse.swt.org.eclipse.swt.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();
		table.deselectAll();
	}

	void comboEvent(Event event) {
		switch (event.type) {
		case SWT.Dispose:
			if (popup != null && !popup.isDisposed()) {
				table.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;
			table = null;
			arrow = null;
			break;
		case SWT.Move:
			dropDown(false);
			break;
		case SWT.Resize:
			internalLayout(false);
			break;
		}
	}

	private String[] getTableItems() {
		TableItem[] items = table.getItems();
		String[] values = new String[items.length];
		for (int i = 0; i < items.length; i++) {
			values[i] = items[i].getText(0);
		}
		return values;
	}

	public Point computeSize(int wHint, int hHint, boolean changed) {
		checkWidget();
		int width = 0, height = 0;
		String[] items = getTableItems();
		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 listSize = table.computeSize(wHint, SWT.DEFAULT, changed);
		int borderWidth = getBorderWidth();

		height = Math.max(hHint, Math.max(textSize.y, arrowSize.y) + 2
				* borderWidth);
		width = Math.max(wHint, Math.max(textWidth + 2 * spacer + arrowSize.x
				+ 2 * borderWidth, listSize.x));
		return new Point(width, height);
	}

	void createPopup(String[] items, int selectionIndex) {
		// create shell and list
		popup = new Shell(getShell(), SWT.NO_TRIM | SWT.ON_TOP);
		table = new Table(popup, SWT.SINGLE | SWT.V_SCROLL | SWT.FULL_SELECTION);
		new TableColumn(table, SWT.LEFT);
		if (font != null) {
			table.setFont(font);
		}
		if (foreground != null) {
			table.setForeground(foreground);
		}
		if (background != null) {
			table.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.FocusOut, SWT.Dispose };
		for (int i = 0; i < listEvents.length; i++) {
			table.addListener(listEvents[i], listener);
		}
		if (items != null) {
			setItems(items);
		}
		if (selectionIndex != -1) {
			select(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 org.eclipse.swt.org.eclipse.swt.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();
		table.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 org.eclipse.swt.org.eclipse.swt.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();
		table.deselectAll();
	}

	void dropDown(boolean drop) {
		if (drop == isDropped()) {
			return;
		}
		if (!drop) {
			popup.setVisible(false);
			table.getColumns()[0].setWidth(0);
			if (!isDisposed() && arrow.isFocusControl()) {
				text.setFocus();
			}
			return;
		}

		if (getShell() != popup.getParent()) {
			String[] items = getTableItems();
			int selectionIndex = table.getSelectionIndex();
			table.removeListener(SWT.Dispose, listener);
			popup.dispose();
			popup = null;
			table = null;
			createPopup(items, selectionIndex);
		}

		Point size = getSize();
		int itemCount = table.getItemCount();
		itemCount = (itemCount == 0) ? visibleItemCount : Math.min(
				visibleItemCount, itemCount);
		int itemHeight = table.getItemHeight() * itemCount;
		Point tableSize = table.computeSize(SWT.DEFAULT, itemHeight, false);
		// int tableWidth = this.getClientArea()
		table.setBounds(1, 1, Math.max(size.x - 2, tableSize.x), tableSize.y
				- table.getHorizontalBar().getSize().y + 2);

		int index = table.getSelectionIndex();
		if (index != -1) {
			table.setTopIndex(index);
		}
		Display display = getDisplay();
		Rectangle tableRect = table.getBounds();
		Rectangle parentRect = display.map(getParent(), null, getBounds());
		Point comboSize = getSize();
		Rectangle displayRect = getMonitor().getClientArea();
		int width = Math.max(comboSize.x, tableRect.width + 2);
		int height = tableRect.height + 2;
		int x = parentRect.x;
		int y = parentRect.y + comboSize.y;
		if (y + height > displayRect.y + displayRect.height) {
			y = parentRect.y - height;
		}
		popup.setBounds(x, y, width, height);
		popup.setVisible(true);

		if (table.getItemCount() > visibleItemCount) {
			table.getColumns()[0].setWidth(text.getSize().x - 2);
		} else {
			table.getColumns()[0].setWidth(table.getClientArea().width);
		}
		table.setFocus();
	}

	/*
	 * 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] == StyleCombo.this) {
				if (i > 0 && siblings[i - 1] instanceof Label) {
					return (Label) siblings[i - 1];
				}
			}
		}
		return null;
	}

	public Control[] getChildren() {
		checkWidget();
		return new Control[0];
	}

	/**
	 * Gets the editable state.
	 * 
	 * @return whether or not the reciever is editable
	 * 
	 * @exception org.eclipse.swt.org.eclipse.swt.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 org.eclipse.swt.org.eclipse.swt.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 table.getItem(index).getText(0);
	}

	/**
	 * Returns the number of items contained in the receiver's list.
	 * 
	 * @return the number of items
	 * 
	 * @exception org.eclipse.swt.org.eclipse.swt.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 table.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 org.eclipse.swt.org.eclipse.swt.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 table.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 org.eclipse.swt.org.eclipse.swt.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 getTableItems();
	}

	char getMnemonic(String string) {
		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 string.charAt(index);
			}
			index++;
		} while (index < length);
		return '\0';
	}

	/**
	 * 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 org.eclipse.swt.org.eclipse.swt.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 org.eclipse.swt.org.eclipse.swt.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 table.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 org.eclipse.swt.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 org.eclipse.swt.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 org.eclipse.swt.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 org.eclipse.swt.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 == table
					|| 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 org.eclipse.swt.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 Arrays.asList(getTableItems()).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 org.eclipse.swt.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);
		}
		String[] items = getTableItems();
		for (int i = start; i < items.length; i++) {
			if (items[i].equals(string)) {
				return i;
			}
		}
		return -1;
	}

	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 text1 = label.getText();
					if (text1 != null) {
						char mnemonic = getMnemonic(text1);
						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);
		table.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();
			}
		});

		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()
				|| table.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);
		arrow.setBounds(width - arrowSize.x, 0, arrowSize.x, arrowSize.y);
	}

	void tableEvent(Event event) {
		switch (event.type) {
		case SWT.Dispose:
			if (getShell() != popup.getParent()) {
				String[] items = getTableItems();
				int selectionIndex = table.getSelectionIndex();
				popup = null;
				table = 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 = table.getSelectionIndex();
			if (index == -1)
				return;
			text.setText(table.getItem(index).getText());
			text.selectAll();
			table.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 = table.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()) {
			table.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 org.eclipse.swt.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();
		table.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 org.eclipse.swt.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();
		table.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 org.eclipse.swt.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);
		}
		int index = Arrays.asList(getTableItems()).indexOf(string);
		table.remove(index);
	}

	/**
	 * Removes all of the items from the receiver's list and clear the contents
	 * of receiver's text field.
	 * <p>
	 * 
	 * @exception org.eclipse.swt.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(""); //$NON-NLS-1$
		table.removeAll();
	}

	/**
	 * Removes the listener from the collection of listeners who will be
	 * notified when the receiver's text is modified.
	 * 
	 * @param listener1
	 *            the listener which should no longer be notified
	 * 
	 * @exception IllegalArgumentException
	 *                <ul>
	 *                <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
	 *                </ul>
	 * @exception org.eclipse.swt.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 listener1) {
		checkWidget();
		if (listener1 == null) {
			SWT.error(SWT.ERROR_NULL_ARGUMENT);
		}
		removeListener(SWT.Modify, listener1);
	}

	/**
	 * Removes the listener from the collection of listeners who will be
	 * notified when the receiver's selection changes.
	 * 
	 * @param listener1
	 *            the listener which should no longer be notified
	 * 
	 * @exception IllegalArgumentException
	 *                <ul>
	 *                <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
	 *                </ul>
	 * @exception org.eclipse.swt.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 listener1) {
		checkWidget();
		if (listener1 == null) {
			SWT.error(SWT.ERROR_NULL_ARGUMENT);
		}
		removeListener(SWT.Selection, listener1);
		removeListener(SWT.DefaultSelection, listener1);
	}

	/**
	 * 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 org.eclipse.swt.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) {
			table.deselectAll();
			text.setText(""); //$NON-NLS-1$
			return;
		}
		if (0 <= index && index < table.getItemCount()) {
			if (index != getSelectionIndex()) {
				text.setText(table.getItem(index).getText());
				text.selectAll();
				table.select(index);
				table.showSelection();
			}
		}
	}

	public void setBackground(Color color) {
		super.setBackground(color);
		background = color;
		if (text != null) {
			text.setBackground(color);
		}
		if (table != null) {
			table.setBackground(color);
		}
		if (arrow != null) {
			arrow.setBackground(color);
		}
	}

	/**
	 * Sets the editable state.
	 * 
	 * @param editable
	 *            the new editable state
	 * 
	 * @exception org.eclipse.swt.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);
		table.setFont(font);
		internalLayout(true);
	}

	public void setForeground(Color color) {
		super.setForeground(color);
		foreground = color;
		if (text != null) {
			text.setForeground(color);
		}
		if (table != null) {
			table.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 org.eclipse.swt.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();
		table.getItem(index).setText(0, 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 org.eclipse.swt.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();
		if (items == null) {
			SWT.error(SWT.ERROR_NULL_ARGUMENT);
		}

		for (int i = 0; i < items.length; i++) {
			TableItem item = new TableItem(table, SWT.NONE);
			if (items[i].equals(defaultValue)) {
				item.setFont(JFaceResources.getFontRegistry().getBold(
						JFaceResources.DEFAULT_FONT));
			}
			item.setText(0, items[i]);
		}
	}

	/**
	 * 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 org.eclipse.swt.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;
	}

	/**
	 * 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 org.eclipse.swt.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 org.eclipse.swt.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 = Arrays.asList(getTableItems()).indexOf(string);
		if (index == -1) {
			table.deselectAll();
			text.setText(string);
			return;
		}
		text.setText(string);
		text.selectAll();
		table.setSelection(index);
		table.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 org.eclipse.swt.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 org.eclipse.swt.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.Modify: {
			table.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;
		}
		}
	}

	public String getDefaultValue() {
		return defaultValue;
	}

	public void setDefaultValue(String defaultValue) {
		this.defaultValue = defaultValue;
		int index = Arrays.asList(getTableItems()).indexOf(defaultValue);
		if (index != -1) {
			table.getItem(index).setFont(
					JFaceResources.getFontRegistry().getBold(
							JFaceResources.DEFAULT_FONT));
		}
	}
}