/*******************************************************************************
 * Copyright (c) 2000, 2008 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 org.eclipse.swt.widgets;

import java.text.DateFormatSymbols;
import java.util.Calendar;

import org.eclipse.swt.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.internal.gtk.OS;

/**
 * Instances of this class are selectable user interface
 * objects that allow the user to enter and modify date
 * or time values.
 * <p>
 * Note that although this class is a subclass of <code>Composite</code>,
 * it does not make sense to add children to it, or set a layout on it.
 * </p>
 * <dl>
 * <dt><b>Styles:</b></dt>
 * <dd>DATE, TIME, CALENDAR, SHORT, MEDIUM, LONG, DROP_DOWN</dd>
 * <dt><b>Events:</b></dt>
 * <dd>DefaultSelection, Selection</dd>
 * </dl>
 * <p>
 * Note: Only one of the styles DATE, TIME, or CALENDAR may be specified,
 * and only one of the styles SHORT, MEDIUM, or LONG may be specified.
 * The DROP_DOWN style is a <em>HINT</em>, and it is only valid with the DATE style.
 * </p><p>
 * IMPORTANT: This class is <em>not</em> intended to be subclassed.
 * </p>
 * 
 * @see <a href="http://www.eclipse.org/swt/snippets/#datetime">DateTime snippets</a>
 * @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: ControlExample</a>
 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
 *
 * @since 3.3
 * @noextend This class is not intended to be subclassed by clients.
 */
public class DateTime extends Composite {
	int day, month, year, hours, minutes, seconds;
	
	static final int MIN_YEAR = 1752; // Gregorian switchover in North America: September 19, 1752
	static final int MAX_YEAR = 9999;

	/* Emulated DATE and TIME variables */
	Calendar calendar;
	DateFormatSymbols formatSymbols;
	Button down, up;
	Text text;
	String format;
	Point[] fieldIndices;
	int[] fieldNames;
	int fieldCount, currentField = 0, characterCount = 0;
	boolean ignoreVerify = false;
	static final String DEFAULT_SHORT_DATE_FORMAT = "MM/YYYY";
	static final String DEFAULT_MEDIUM_DATE_FORMAT = "MM/DD/YYYY";
	static final String DEFAULT_LONG_DATE_FORMAT = "MM/DD/YYYY";
	static final String DEFAULT_SHORT_TIME_FORMAT = "HH:MM AM";
	static final String DEFAULT_MEDIUM_TIME_FORMAT = "HH:MM:SS AM";
	static final String DEFAULT_LONG_TIME_FORMAT = "HH:MM:SS AM";

/**
 * 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 composite control which will be the parent of the new instance (cannot be null)
 * @param style the style of control to construct
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
 *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
 * </ul>
 *
 * @see SWT#DATE
 * @see SWT#TIME
 * @see SWT#CALENDAR
 * @see SWT#SHORT
 * @see SWT#MEDIUM
 * @see SWT#LONG
 * @see SWT#DROP_DOWN
 * @see Widget#checkSubclass
 * @see Widget#getStyle
 */
public DateTime (Composite parent, int style) {
	super (parent, checkStyle (style));
	if ((this.style & SWT.CALENDAR) == 0) {
		/* SWT.DATE and SWT.TIME */
		calendar = Calendar.getInstance();
		formatSymbols = new DateFormatSymbols();
		text = new Text(this, SWT.SINGLE);
		/* disable the native drag and drop for the date/time text field */
		OS.gtk_drag_dest_unset(text.handle);
		if ((this.style & SWT.DATE) != 0) {
			setFormat((this.style & SWT.SHORT) != 0 ? DEFAULT_SHORT_DATE_FORMAT : (this.style & SWT.LONG) != 0 ? DEFAULT_LONG_DATE_FORMAT : DEFAULT_MEDIUM_DATE_FORMAT);
		} else { // SWT.TIME
			setFormat((this.style & SWT.SHORT) != 0 ? DEFAULT_SHORT_TIME_FORMAT : (this.style & SWT.LONG) != 0 ? DEFAULT_LONG_TIME_FORMAT : DEFAULT_MEDIUM_TIME_FORMAT);
		}
		text.setText(getFormattedString(this.style));
		Listener listener = new Listener() {
			public void handleEvent(Event event) {
				switch(event.type) {
					case SWT.KeyDown: onKeyDown(event); break;
					case SWT.FocusIn: onFocusIn(event); break;
					case SWT.FocusOut: onFocusOut(event); break;
					case SWT.MouseDown: onMouseClick(event); break;
					case SWT.MouseUp: onMouseClick(event); break;
					case SWT.Verify: onVerify(event); break;
				}
			}
		};
		text.addListener(SWT.KeyDown, listener);
		text.addListener(SWT.FocusIn, listener);
		text.addListener(SWT.FocusOut, listener);
		text.addListener(SWT.MouseDown, listener);
		text.addListener(SWT.MouseUp, listener);
		text.addListener(SWT.Verify, listener);
		up = new Button(this, SWT.ARROW | SWT.UP);
		//up.setToolTipText(SWT.getMessage ("SWT_Up")); //$NON-NLS-1$
		down = new Button(this, SWT.ARROW | SWT.DOWN);
		//down.setToolTipText(SWT.getMessage ("SWT_Down")); //$NON-NLS-1$
		up.addListener(SWT.Selection, new Listener() {
			public void handleEvent(Event event) {
				incrementField(+1);
				text.setFocus();
			}
		});
		down.addListener(SWT.Selection, new Listener() {
			public void handleEvent(Event event) {
				incrementField(-1);
				text.setFocus();
			}
		});
		addListener(SWT.Resize, new Listener() {
			public void handleEvent(Event event) {
				onResize(event);
			}
		});
	}
}

static int checkStyle (int style) {
	/*
	* Even though it is legal to create this widget
	* with scroll bars, they serve no useful purpose
	* because they do not automatically scroll the
	* widget's client area.  The fix is to clear
	* the SWT style.
	*/
	style &= ~(SWT.H_SCROLL | SWT.V_SCROLL);
	style = checkBits (style, SWT.DATE, SWT.TIME, SWT.CALENDAR, 0, 0, 0);
	return checkBits (style, SWT.MEDIUM, SWT.SHORT, SWT.LONG, 0, 0, 0);
}

/**
 * Adds the listener to the collection of listeners who will
 * be notified when the control is selected by the user, by sending
 * it one of the messages defined in the <code>SelectionListener</code>
 * interface.
 * <p>
 * <code>widgetSelected</code> is called when the user changes the control's value.
 * <code>widgetDefaultSelected</code> is typically called when ENTER is pressed.
 * </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) error (SWT.ERROR_NULL_ARGUMENT);
	TypedListener typedListener = new TypedListener (listener);
	addListener (SWT.Selection, typedListener);
	addListener (SWT.DefaultSelection, typedListener);
}

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

public Point computeSize (int wHint, int hHint, boolean changed) {
	checkWidget ();
	int width = 0, height = 0;
	if (wHint == SWT.DEFAULT || hHint == SWT.DEFAULT) {
		if ((style & SWT.CALENDAR) != 0) {
			// TODO: CALENDAR computeSize
			width = 300;
			height = 200;
		} else {
			/* SWT.DATE and SWT.TIME */
			GC gc = new GC(text);
			Point textSize = gc.stringExtent(getComputeSizeString(style));
			gc.dispose();
			Rectangle trim = text.computeTrim(0, 0, textSize.x, textSize.y);
			Point buttonSize = up.computeSize(SWT.DEFAULT, SWT.DEFAULT, changed);
			width = trim.width + buttonSize.x;
			height = Math.max(trim.height, buttonSize.y);
		}
	}
	if (width == 0) width = DEFAULT_WIDTH;
	if (height == 0) height = DEFAULT_HEIGHT;
	if (wHint != SWT.DEFAULT) width = wHint;
	if (hHint != SWT.DEFAULT) height = hHint;
	int border = getBorderWidth ();
	width += border * 2; height += border * 2;
	return new Point (width, height);
}

void createHandle (int index) {
	if ((style & SWT.CALENDAR) != 0) {
		state |= HANDLE;
		fixedHandle = OS.g_object_new (display.gtk_fixed_get_type (), 0);
		if (fixedHandle == 0) error (SWT.ERROR_NO_HANDLES);
		OS.gtk_fixed_set_has_window (fixedHandle, true);
		handle = OS.gtk_calendar_new ();
		if (handle == 0) error (SWT.ERROR_NO_HANDLES);
		OS.gtk_container_add (fixedHandle, handle);
		if (OS.GTK_VERSION >= OS.VERSION(2, 4, 0)) {
			OS.gtk_calendar_set_display_options(handle, OS.GTK_CALENDAR_SHOW_HEADING | OS.GTK_CALENDAR_SHOW_DAY_NAMES);
		} else {
			OS.gtk_calendar_display_options(handle, OS.GTK_CALENDAR_SHOW_HEADING | OS.GTK_CALENDAR_SHOW_DAY_NAMES);			
		}
	} else {
		super.createHandle(index);
	}
}

boolean checkSubwindow () {
	return false;
}

void createWidget (int index) {
	super.createWidget (index);
	if ((style & SWT.CALENDAR) != 0) {
		getDate();
	}
}

void commitCurrentField() {
	if (characterCount > 0) {
		characterCount = 0;
		int fieldName = fieldNames[currentField];
		int start = fieldIndices[currentField].x;
		int end = fieldIndices[currentField].y;
		String value = text.getText(start, end - 1);
		int s = value.lastIndexOf(' ');
		if (s != -1) value = value.substring(s + 1);
		int newValue = unformattedIntValue(fieldName, value, characterCount == 0, calendar.getActualMaximum(fieldName));
		if (newValue != -1) setTextField(fieldName, newValue, true, true);
	}
}

String formattedStringValue(int fieldName, int value, boolean adjust) {
	if (fieldName == Calendar.AM_PM) {
		String[] ampm = formatSymbols.getAmPmStrings();
		return ampm[value];
	}
	if (adjust) {
		if (fieldName == Calendar.HOUR && value == 0) {
			return String.valueOf(12);
		}
		if (fieldName == Calendar.MONTH) {
			return String.valueOf(value + 1);
		}
	}
	return String.valueOf(value);
}

String getComputeSizeString(int style) {
	if ((style & SWT.DATE) != 0) {
		return (style & SWT.SHORT) != 0 ? DEFAULT_SHORT_DATE_FORMAT : (style & SWT.LONG) != 0 ? DEFAULT_LONG_DATE_FORMAT : DEFAULT_MEDIUM_DATE_FORMAT;
	}
	// SWT.TIME
	return (style & SWT.SHORT) != 0 ? DEFAULT_SHORT_TIME_FORMAT : (style & SWT.LONG) != 0 ? DEFAULT_LONG_TIME_FORMAT : DEFAULT_MEDIUM_TIME_FORMAT;
}

int getFieldIndex(int fieldName) {
	for (int i = 0; i < fieldCount; i++) {
		if (fieldNames[i] == fieldName) {
			return i;
		}
	}
	return -1;
}

String getFormattedString(int style) {
	if ((style & SWT.TIME) != 0) {
		String[] ampm = formatSymbols.getAmPmStrings();
		int h = calendar.get(Calendar.HOUR); if (h == 0) h = 12;
		int m = calendar.get(Calendar.MINUTE);
		int s = calendar.get(Calendar.SECOND);
		int a = calendar.get(Calendar.AM_PM);
		if ((style & SWT.SHORT) != 0) return "" + (h < 10 ? " " : "") + h + ":" + (m < 10 ? "0" : "") + m + " " + ampm[a];
		return "" + (h < 10 ? " " : "") + h + ":" + (m < 10 ? "0" : "") + m + ":" + (s < 10 ? "0" : "") + s + " " + ampm[a];
	}
	/* SWT.DATE */
	int y = calendar.get(Calendar.YEAR);
	int m = calendar.get(Calendar.MONTH) + 1;
	int d = calendar.get(Calendar.DAY_OF_MONTH);
	if ((style & SWT.SHORT) != 0) return "" + (m < 10 ? " " : "") + m + "/" + y;
	return "" + (m < 10 ? " " : "") + m + "/" + (d < 10 ? " " : "") + d + "/" + y;
}

void getDate() {
	int [] y = new int [1];
	int [] m = new int [1];
	int [] d = new int [1];
	OS.gtk_calendar_get_date(handle, y, m, d);
	year = y[0];
	month = m[0];
	day = d[0];
}

/**
 * Returns the receiver's date, or day of the month.
 * <p>
 * The first day of the month is 1, and the last day depends on the month and year.
 * </p>
 *
 * @return a positive integer beginning with 1
 *
 * @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 getDay () {
	checkWidget ();
	if ((style & SWT.CALENDAR) != 0) {
		getDate();
		return day;
	} else {
		return calendar.get(Calendar.DAY_OF_MONTH);
	}
}

/**
 * Returns the receiver's hours.
 * <p>
 * Hours is an integer between 0 and 23.
 * </p>
 *
 * @return an integer between 0 and 23
 *
 * @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 getHours () {
	checkWidget ();
	if ((style & SWT.CALENDAR) != 0) {
		return hours;
	} else {
		return calendar.get(Calendar.HOUR_OF_DAY);
	}
}

/**
 * Returns the receiver's minutes.
 * <p>
 * Minutes is an integer between 0 and 59.
 * </p>
 *
 * @return an integer between 0 and 59
 *
 * @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 getMinutes () {
	checkWidget ();
	if ((style & SWT.CALENDAR) != 0) {
		return minutes;
	} else {
		return calendar.get(Calendar.MINUTE);
	}
}

/**
 * Returns the receiver's month.
 * <p>
 * The first month of the year is 0, and the last month is 11.
 * </p>
 *
 * @return an integer between 0 and 11
 *
 * @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 getMonth () {
	checkWidget ();
	if ((style & SWT.CALENDAR) != 0) {
		getDate();
		return month;
	} else {
		return calendar.get(Calendar.MONTH);
	}
}

String getNameText() {
	return (style & SWT.TIME) != 0 ? getHours() + ":" + getMinutes() + ":" + getSeconds()
			: (getMonth() + 1) + "/" + getDay() + "/" + getYear();
}

/**
 * Returns the receiver's seconds.
 * <p>
 * Seconds is an integer between 0 and 59.
 * </p>
 *
 * @return an integer between 0 and 59
 *
 * @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 getSeconds () {
	checkWidget ();
	if ((style & SWT.CALENDAR) != 0) {
		return seconds;
	} else {
		return calendar.get(Calendar.SECOND);
	}
}

/**
 * Returns the receiver's year.
 * <p>
 * The first year is 1752 and the last year is 9999.
 * </p>
 *
 * @return an integer between 1752 and 9999
 *
 * @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 getYear () {
	checkWidget ();
	if ((style & SWT.CALENDAR) != 0) {
		getDate();
		return year;
	} else {
		return calendar.get(Calendar.YEAR);
	}
}

int /*long*/ gtk_day_selected (int /*long*/ widget) {
	sendSelectionEvent ();
	return 0;
}

int /*long*/ gtk_day_selected_double_click (int /*long*/ widget) {
	postEvent(SWT.DefaultSelection);
	return 0;
}

int /*long*/ gtk_month_changed (int /*long*/ widget) {
	sendSelectionEvent ();
	return 0;
}

void hookEvents () {
	super.hookEvents();
	if ((style & SWT.CALENDAR) != 0) {
		OS.g_signal_connect_closure (handle, OS.day_selected, display.closures [DAY_SELECTED], false);
		OS.g_signal_connect_closure (handle, OS.day_selected_double_click, display.closures [DAY_SELECTED_DOUBLE_CLICK], false);
		OS.g_signal_connect_closure (handle, OS.month_changed, display.closures [MONTH_CHANGED], false);
	}
}

boolean isValidTime(int fieldName, int value) {
	Calendar validCalendar;
	if ((style & SWT.CALENDAR) != 0) {
		validCalendar = Calendar.getInstance();
	} else {
		validCalendar = calendar;
	}
	int min = validCalendar.getActualMinimum(fieldName);
	int max = validCalendar.getActualMaximum(fieldName);
	return value >= min && value <= max;
}

boolean isValidDate(int year, int month, int day) {
	if (year < MIN_YEAR || year > MAX_YEAR) return false;
	Calendar valid = Calendar.getInstance();
	valid.set(year, month, day);
	return valid.get(Calendar.YEAR) == year
		&& valid.get(Calendar.MONTH) == month
		&& valid.get(Calendar.DAY_OF_MONTH) == day;
}

void incrementField(int amount) {
	int fieldName = fieldNames[currentField];
	int value = calendar.get(fieldName);
	if (fieldName == Calendar.HOUR) {
		int max = calendar.getMaximum(Calendar.HOUR);
		int min = calendar.getMinimum(Calendar.HOUR);
		if ((value == max && amount == 1) || (value == min && amount == -1)) {
			int temp = currentField;
			currentField = getFieldIndex(Calendar.AM_PM);
			setTextField(Calendar.AM_PM, (calendar.get(Calendar.AM_PM) + 1) % 2, true, true);
			currentField = temp;
		}
	}
	setTextField(fieldName, value + amount, true, true);
}

void onKeyDown(Event event) {
	int fieldName;
	switch (event.keyCode) {
		case SWT.ARROW_RIGHT:
		case SWT.KEYPAD_DIVIDE:
			// a right arrow or a valid separator navigates to the field on the right, with wraping
			selectField((currentField + 1) % fieldCount);
			break;
		case SWT.ARROW_LEFT:
			// navigate to the field on the left, with wrapping
			int index = currentField - 1;
			selectField(index < 0 ? fieldCount - 1 : index);
			break;
		case SWT.ARROW_UP:
		case SWT.KEYPAD_ADD:
			// set the value of the current field to value + 1, with wrapping
			commitCurrentField();
			incrementField(+1);
			break;
		case SWT.ARROW_DOWN:
		case SWT.KEYPAD_SUBTRACT:
			// set the value of the current field to value - 1, with wrapping
			commitCurrentField();
			incrementField(-1);
			break;
		case SWT.HOME:
			// set the value of the current field to its minimum
			fieldName = fieldNames[currentField];
			setTextField(fieldName, calendar.getActualMinimum(fieldName), true, true);
			break;
		case SWT.END:
			// set the value of the current field to its maximum
			fieldName = fieldNames[currentField];
			setTextField(fieldName, calendar.getActualMaximum(fieldName), true, true);
			break;
		case SWT.CR:
			postEvent(SWT.DefaultSelection);
			break;
		default:
			switch (event.character) {
				case '/':
				case ':':
				case '-':
				case '.':
					// a valid separator navigates to the field on the right, with wraping
					selectField((currentField + 1) % fieldCount);
					break;
			}
	}
}

void onFocusIn(Event event) {
	selectField(currentField);
}

void onFocusOut(Event event) {
	commitCurrentField();
}

void onMouseClick(Event event) {
	if (event.button != 1) return;
	Point sel = text.getSelection();
	for (int i = 0; i < fieldCount; i++) {
		if (fieldIndices[i].x <= sel.x && sel.x <= fieldIndices[i].y) {
			selectField(i);
			break;
		}
	}
}

void onResize(Event event) {
	Rectangle rect = getClientArea ();
	int width = rect.width;
	int height = rect.height;
	Point buttonSize = up.computeSize(SWT.DEFAULT, height);
	int buttonHeight = buttonSize.y / 2;
	text.setBounds(0, 0, width - buttonSize.x, height);
	up.setBounds(width - buttonSize.x, 0, buttonSize.x, buttonHeight);
	down.setBounds(width - buttonSize.x, buttonHeight, buttonSize.x, buttonHeight);
}

void onVerify(Event event) {
	if (ignoreVerify) return;
	event.doit = false;
	int fieldName = fieldNames[currentField];
	int start = fieldIndices[currentField].x;
	int end = fieldIndices[currentField].y;
	int length = end - start;
	String newText = event.text;
	if (fieldName == Calendar.AM_PM) {
		String[] ampm = formatSymbols.getAmPmStrings();
		if (newText.equalsIgnoreCase(ampm[Calendar.AM].substring(0, 1)) || newText.equalsIgnoreCase(ampm[Calendar.AM])) {
			setTextField(fieldName, Calendar.AM, true, false);
		} else if (newText.equalsIgnoreCase(ampm[Calendar.PM].substring(0, 1)) || newText.equalsIgnoreCase(ampm[Calendar.PM])) {
			setTextField(fieldName, Calendar.PM, true, false);
		}
		return;
	}
	if (characterCount > 0) {
		try {
			Integer.parseInt(newText);
		} catch (NumberFormatException ex) {
			return;
		}
		String value = text.getText(start, end - 1);
		int s = value.lastIndexOf(' ');
		if (s != -1) value = value.substring(s + 1);
		newText = "" + value + newText;
	}
	int newTextLength = newText.length();
	boolean first = characterCount == 0;
	characterCount = (newTextLength < length) ? newTextLength : 0;
	int max = calendar.getActualMaximum(fieldName);
	int min = calendar.getActualMinimum(fieldName);
	int newValue = unformattedIntValue(fieldName, newText, characterCount == 0, max);
	if (newValue == -1) {
		characterCount = 0;
		return;
	}
	if (first && newValue == 0 && length > 1) {
		setTextField(fieldName, newValue, false, false);
	} else if (min <= newValue && newValue <= max) {
		setTextField(fieldName, newValue, characterCount == 0, characterCount == 0);
	} else {
		if (newTextLength >= length) {
			newText = newText.substring(newTextLength - length + 1);
			newValue = unformattedIntValue(fieldName, newText, characterCount == 0, max);
			if (newValue != -1) {
				characterCount = length - 1;
				if (min <= newValue && newValue <= max) {
					setTextField(fieldName, newValue, characterCount == 0, true);
				}
			}
		}
	}
}

void releaseWidget () {
	super.releaseWidget();
	//TODO: need to do anything here?
}

/**
 * Removes the listener from the collection of listeners who will
 * be notified when the control is selected by the user.
 *
 * @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) error (SWT.ERROR_NULL_ARGUMENT);
	if (eventTable == null) return;
	eventTable.unhook (SWT.Selection, listener);
	eventTable.unhook (SWT.DefaultSelection, listener);	
}

void selectField(int index) {
	if (index != currentField) {
		commitCurrentField();
	}
	final int start = fieldIndices[index].x;
	final int end = fieldIndices[index].y;
	Point pt = text.getSelection();
	if (index == currentField && start == pt.x && end == pt.y) return;
	currentField = index;
	display.asyncExec(new Runnable() {
		public void run() {
			if (!text.isDisposed()) {
				String value = text.getText(start, end - 1);
				int s = value.lastIndexOf(' ');
				if (s == -1) s = start;
				else s = start + s + 1;
				text.setSelection(s, end);
			}
		}
	});	
}

void sendSelectionEvent () {
	int [] y = new int [1];
	int [] m = new int [1];
	int [] d = new int [1];
	OS.gtk_calendar_get_date(handle, y, m, d);
	//TODO: hours, minutes, seconds?
	if (d[0] != day ||
		m[0] != month ||
		y[0] != year) {
		year = y[0];
		month = m[0];
		day = d[0];
		postEvent (SWT.Selection);
	}
}

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

public void setFont(Font font) {
	checkWidget();
	super.setFont(font);
	if (text != null) text.setFont(font);
	redraw();
}

public void setForeground(Color color) {
	checkWidget();
	super.setForeground(color);
	if (text != null) text.setForeground(color);
}

/*public*/ void setFormat(String string) {
	checkWidget();
	// TODO: this needs to be locale sensitive
	fieldCount = (style & SWT.DATE) != 0 ? ((style & SWT.SHORT) != 0 ? 2 : 3) : ((style & SWT.SHORT) != 0 ? 3 : 4);
	fieldIndices = new Point[fieldCount];
	fieldNames = new int[fieldCount];
	if ((style & SWT.DATE) != 0) {
		fieldNames[0] = Calendar.MONTH;
		fieldIndices[0] = new Point(0, 2);
		if ((style & SWT.SHORT) != 0) {
			fieldNames[1] = Calendar.YEAR;
			fieldIndices[1] = new Point(3, 7);
		} else {
			fieldNames[1] = Calendar.DAY_OF_MONTH;
			fieldIndices[1] = new Point(3, 5);
			fieldNames[2] = Calendar.YEAR;
			fieldIndices[2] = new Point(6, 10);
		}
	} else { /* SWT.TIME */
		fieldNames[0] = Calendar.HOUR;
		fieldIndices[0] = new Point(0, 2);
		fieldNames[1] = Calendar.MINUTE;
		fieldIndices[1] = new Point(3, 5);
		if ((style & SWT.SHORT) != 0) {
			fieldNames[2] = Calendar.AM_PM;
			fieldIndices[2] = new Point(6, 8);
		} else {
			fieldNames[2] = Calendar.SECOND;
			fieldIndices[2] = new Point(6, 8);
			fieldNames[3] = Calendar.AM_PM;
			fieldIndices[3] = new Point(9, 11);
		}
	}
}

void setField(int fieldName, int value) {
	if (calendar.get(fieldName) == value) return;
	if (fieldName == Calendar.AM_PM) {
		calendar.roll(Calendar.HOUR_OF_DAY, 12); // TODO: needs more work for setFormat and locale
	}
	calendar.set(fieldName, value);
	postEvent(SWT.Selection);
}

void setTextField(int fieldName, int value, boolean commit, boolean adjust) {
	if (commit) {
		int max = calendar.getActualMaximum(fieldName);
		int min = calendar.getActualMinimum(fieldName);
		if (fieldName == Calendar.YEAR) {
			max = MAX_YEAR;
			min = MIN_YEAR;
			/* Special case: convert 1 or 2-digit years into reasonable 4-digit years. */
			int currentYear = Calendar.getInstance().get(Calendar.YEAR);
			int currentCentury = (currentYear / 100) * 100;
			if (value < (currentYear + 30) % 100) value += currentCentury;
			else if (value < 100) value += currentCentury - 100;
		}
		if (value > max) value = min; // wrap
		if (value < min) value = max; // wrap
	}
	int start = fieldIndices[currentField].x;
	int end = fieldIndices[currentField].y;
	text.setSelection(start, end);
	String newValue = formattedStringValue(fieldName, value, adjust);
	StringBuffer buffer = new StringBuffer(newValue);
	/* Convert leading 0's into spaces. */
	int prependCount = end - start - buffer.length();
	for (int i = 0; i < prependCount; i++) {
		switch (fieldName) {
		case Calendar.MINUTE:
		case Calendar.SECOND:
			buffer.insert(0, 0);
		break;
		default:
			buffer.insert(0, ' ');
		break;
		}
	}		
	newValue = buffer.toString();
	ignoreVerify = true;
	text.insert(newValue);
	ignoreVerify = false;
	selectField(currentField);
	if (commit) setField(fieldName, value);
}

/**
 * Sets the receiver's year, month, and day in a single operation.
 * <p>
 * This is the recommended way to set the date, because setting the year,
 * month, and day separately may result in invalid intermediate dates.
 * </p>
 *
 * @param year an integer between 1752 and 9999
 * @param month an integer between 0 and 11
 * @param day a positive integer beginning with 1
 *
 * @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 3.4
 */
public void setDate (int year, int month, int day) {
	checkWidget ();
	if (!isValidDate(year, month, day)) return;
	if ((style & SWT.CALENDAR) != 0) {
		this.year = year;
		this.month = month;
		this.day = day;
		OS.gtk_calendar_select_month(handle, month, year);
		OS.gtk_calendar_select_day(handle, day);
	} else {
		calendar.set(year, month, day);
		updateControl();
	}
}

/**
 * Sets the receiver's date, or day of the month, to the specified day.
 * <p>
 * The first day of the month is 1, and the last day depends on the month and year.
 * If the specified day is not valid for the receiver's month and year, then it is ignored. 
 * </p>
 *
 * @param day a positive integer beginning with 1
 *
 * @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 #setDate
 */
public void setDay (int day) {
	checkWidget ();
	if (!isValidDate(getYear(), getMonth(), day)) return;
	if ((style & SWT.CALENDAR) != 0) {
		this.day = day;
		OS.gtk_calendar_select_day(handle, day);
	} else {
		calendar.set(Calendar.DAY_OF_MONTH, day);
		updateControl();
	}
}

/**
 * Sets the receiver's hours.
 * <p>
 * Hours is an integer between 0 and 23.
 * </p>
 *
 * @param hours an integer between 0 and 23
 *
 * @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 setHours (int hours) {
	checkWidget ();
	if (!isValidTime(Calendar.HOUR_OF_DAY, hours)) return;
	if ((style & SWT.CALENDAR) != 0) {
		this.hours = hours;
	} else {
		calendar.set(Calendar.HOUR_OF_DAY, hours);
		updateControl();
	}
}

/**
 * Sets the receiver's minutes.
 * <p>
 * Minutes is an integer between 0 and 59.
 * </p>
 *
 * @param minutes an integer between 0 and 59
 *
 * @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 setMinutes (int minutes) {
	checkWidget ();
	if (!isValidTime(Calendar.MINUTE, minutes)) return;
	if ((style & SWT.CALENDAR) != 0) {
		this.minutes = minutes;
	} else {
		calendar.set(Calendar.MINUTE, minutes);
		updateControl();
	}
}

/**
 * Sets the receiver's month.
 * <p>
 * The first month of the year is 0, and the last month is 11.
 * If the specified month is not valid for the receiver's day and year, then it is ignored. 
 * </p>
 *
 * @param month an integer between 0 and 11
 *
 * @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 #setDate
 */
public void setMonth (int month) {
	checkWidget ();
	if (!isValidDate(getYear(), month, getDay())) return;
	if ((style & SWT.CALENDAR) != 0) {
		this.month = month;
		OS.gtk_calendar_select_month(handle, month, year);
	} else {
		calendar.set(Calendar.MONTH, month);
		updateControl();
	}
}

/**
 * Sets the receiver's seconds.
 * <p>
 * Seconds is an integer between 0 and 59.
 * </p>
 *
 * @param seconds an integer between 0 and 59
 *
 * @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 setSeconds (int seconds) {
	checkWidget ();
	if (!isValidTime(Calendar.SECOND, seconds)) return;
	if ((style & SWT.CALENDAR) != 0) {
		this.seconds = seconds;
	} else {
		calendar.set(Calendar.SECOND, seconds);
		updateControl();
	}
}

/**
 * Sets the receiver's hours, minutes, and seconds in a single operation.
 *
 * @param hours an integer between 0 and 23
 * @param minutes an integer between 0 and 59
 * @param seconds an integer between 0 and 59
 *
 * @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 3.4
 */
public void setTime (int hours, int minutes, int seconds) {
	checkWidget ();
	if (!isValidTime(Calendar.HOUR_OF_DAY, hours)) return;
	if (!isValidTime(Calendar.MINUTE, minutes)) return;
	if (!isValidTime(Calendar.SECOND, seconds)) return;
	if ((style & SWT.CALENDAR) != 0) {
		this.hours = hours;
		this.minutes = minutes;
		this.seconds = seconds;
	} else {
		calendar.set(Calendar.HOUR_OF_DAY, hours);
		calendar.set(Calendar.MINUTE, minutes);
		calendar.set(Calendar.SECOND, seconds);
		updateControl();
	}
}

/**
 * Sets the receiver's year.
 * <p>
 * The first year is 1752 and the last year is 9999.
 * If the specified year is not valid for the receiver's day and month, then it is ignored. 
 * </p>
 *
 * @param year an integer between 1752 and 9999
 *
 * @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 #setDate
 */
public void setYear (int year) {
	checkWidget ();
	if (!isValidDate(year, getMonth(), getDay())) return;
	if ((style & SWT.CALENDAR) != 0) {
		this.year = year;
		OS.gtk_calendar_select_month(handle, month, year);
	} else {
		calendar.set(Calendar.YEAR, year);
		updateControl();
	}
}

int unformattedIntValue(int fieldName, String newText, boolean adjust, int max) {
	int newValue;
	try {
		newValue = Integer.parseInt(newText);
	} catch (NumberFormatException ex) {
		return -1;
	}
	if (fieldName == Calendar.MONTH && adjust) {
		newValue--;
		if (newValue == -1) newValue = max;
	}
	if (fieldName == Calendar.HOUR && adjust) {
		if (newValue == 12) newValue = 0; // TODO: needs more work for setFormat and locale
	}
	return newValue;
}

public void updateControl() {
	if (text != null) {
		String string = getFormattedString(style);
		ignoreVerify = true;
		text.setText(string);
		ignoreVerify = false;
	}
	redraw();	
}
}