datefield.java

j2me polish学习的经典代码

//#condition polish.usePolishGui
/*
 * Copyright (c) 2004-2005 Robert Virkus / Enough Software
 *
 * This file is part of J2ME Polish.
 *
 * J2ME Polish is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * J2ME Polish is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with J2ME Polish; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 * Commercial licenses are also available, please
 * refer to the accompanying LICENSE.txt or visit
 * http://www.j2mepolish.org for details.
 */
package de.enough.polish.ui;

import javax.microedition.lcdui.*;

//#if polish.blackberry
	import net.rim.device.api.ui.Field;
	import net.rim.device.api.ui.FieldChangeListener;
import net.rim.device.api.ui.UiApplication;
	import net.rim.device.api.ui.XYRect;
	import de.enough.polish.blackberry.ui.PolishDateField;
//#endif
import de.enough.polish.util.BitMapFontViewer;
import de.enough.polish.util.Locale;

import java.util.*;

/**
 * A <code>DateField</code> is an editable component for presenting
 * date and time (calendar)
 * information that may be placed into a <code>Form</code>. Value for
 * this field can be
 * initially set or left unset. If value is not set then the UI for the field
 * shows this clearly. The field value for &quot;not initialized
 * state&quot; is not valid
 * value and <code>getDate()</code> for this state returns <code>null</code>.
 * <p>
 * Instance of a <code>DateField</code> can be configured to accept
 * date or time information
 * or both of them. This input mode configuration is done by
 * <code>DATE</code>, <code>TIME</code> or
 * <code>DATE_TIME</code> static fields of this
 * class. <code>DATE</code> input mode allows to set only
 * date information and <code>TIME</code> only time information
 * (hours, minutes). <code>DATE_TIME</code>
 * allows to set both clock time and date values.
 * <p>
 * In <code>TIME</code> input mode the date components of
 * <code>Date</code> object
 * must be set to the &quot;zero epoch&quot; value of January 1, 1970.
 * <p>
 * Calendar calculations in this field are based on default locale and defined
 * time zone. Because of the calculations and different input modes date object
 * may not contain same millisecond value when set to this field and get back
 * from this field.
 * <HR>
 * 
 * @author Robert Virkus, [e-mail]
 * @since MIDP 1.0
 */
public class DateField extends StringItem
//#if polish.DateField.useDirectInput == true || polish.Bugs.dateFieldBroken || polish.blackberry
	//#define tmp.directInput
	implements ItemCommandListener
//#else
	//# implements CommandListener
//#endif
//#if polish.blackberry
	, FieldChangeListener
//#endif
{
	/**
	 * Input mode for date information (day, month, year). With this mode this
	 * <code>DateField</code> presents and allows only to modify date
	 * value. The time
	 * information of date object is ignored.
	 * 
	 * <P>Value <code>1</code> is assigned to <code>DATE</code>.</P></DL>
	 * 
	 */
	public static final int DATE = 1;

	/**
	 * Input mode for time information (hours and minutes). With this mode this
	 * <code>DateField</code> presents and allows only to modify
	 * time. The date components
	 * should be set to the &quot;zero epoch&quot; value of January 1, 1970 and
	 * should not be accessed.
	 * 
	 * <P>Value <code>2</code> is assigned to <code>TIME</code>.</P></DL>
	 * 
	 */
	public static final int TIME = 2;

	/**
	 * Input mode for date (day, month, year) and time (minutes, hours)
	 * information. With this mode this <code>DateField</code>
	 * presents and allows to modify
	 * both time and date information.
	 * 
	 * <P>Value <code>3</code> is assigned to <code>DATE_TIME</code>.</P></DL>
	 * 
	 * 
	 */
	public static final int DATE_TIME = 3;

	private Date date;
	private int inputMode;
	private TimeZone timeZone;
	private boolean showCaret;
	private int originalWidth;
	private int originalHeight;
	private long lastCaretSwitch;

	private Calendar calendar;
	
	//#if tmp.directInput
		private static final int[] DAYS_IN_MONTHS = { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
		private int editIndex;
		private int textComplementColor;
		private int currentField;
		private int currentFieldStartIndex;
		private ItemCommandListener additionalItemCommandListener;
		//#if polish.css.font-bitmap
			private int caretWidth;
			private int caretX;
			private int fontHeight;
			private BitMapFontViewer caretViewer;
		//#endif
	//#else
		private javax.microedition.lcdui.DateField midpDateField; 
		private javax.microedition.lcdui.Form form;
	//#endif

	//#if polish.blackberry
		private PolishDateField blackberryDateField;
	//#endif
	/**
	 * Creates a <code>DateField</code> object with the specified
	 * label and mode. This call
	 * is identical to <code>DateField(label, mode, null)</code>.
	 * 
	 * @param label item label
	 * @param mode the input mode, one of DATE, TIME or DATE_TIME
	 * @throws IllegalArgumentException if the input mode's value is invalid
	 */
	public DateField( String label, int mode)
	{
		this( label, mode, null, null );
	}

	/**
	 * Creates a <code>DateField</code> object with the specified
	 * label and mode. This call
	 * is identical to <code>DateField(label, mode, null)</code>.
	 * 
	 * @param label item label
	 * @param mode the input mode, one of DATE, TIME or DATE_TIME
	 * @param style the CSS style for this item
	 * @throws IllegalArgumentException if the input mode's value is invalid
	 */
	public DateField( String label, int mode, Style style)
	{
		this( label, mode, null, style );
	}
	
	/**
	 * Creates a date field in which calendar calculations are based
	 * on specific
	 * <code>TimeZone</code> object and the default calendaring system for the
	 * current locale.
	 * The value of the <code>DateField</code> is initially in the
	 * &quot;uninitialized&quot; state.
	 * If <code>timeZone</code> is <code>null</code>, the system's
	 * default time zone is used.
	 * 
	 * @param label item label
	 * @param mode the input mode, one of DATE, TIME or DATE_TIME
	 * @param timeZone a specific time zone, or null for the default time zone
	 * @throws IllegalArgumentException if the input mode's value is invalid
	 */
	public DateField( String label, int mode, TimeZone timeZone)
	{
		this( label, mode, timeZone, null );
	}

	/**
	 * Creates a date field in which calendar calculations are based
	 * on specific
	 * <code>TimeZone</code> object and the default calendaring system for the
	 * current locale.
	 * The value of the <code>DateField</code> is initially in the
	 * &quot;uninitialized&quot; state.
	 * If <code>timeZone</code> is <code>null</code>, the system's
	 * default time zone is used.
	 * 
	 * @param label item label
	 * @param mode the input mode, one of DATE, TIME or DATE_TIME
	 * @param timeZone a specific time zone, or null for the default time zone
	 * @param style the CSS style for this item
	 * @throws IllegalArgumentException if the input mode's value is invalid
	 */
	public DateField( String label, int mode, TimeZone timeZone, Style style)
	{
		super( label, null, INTERACTIVE, style );
		this.inputMode = mode;
		if (timeZone != null) {
			this.timeZone = timeZone;
		} else {
			this.timeZone = TimeZone.getDefault();
		}
		setDate( null );
		//#if tmp.directInput
			//#ifdef polish.i18n.useDynamicTranslations
				String clearLabel = Locale.get("polish.command.clear");
				if ( clearLabel != TextField.CLEAR_CMD.getLabel()) {
					TextField.CLEAR_CMD = new Command( Locale.get("polish.command.clear"), Command.ITEM, 2 );
				}
			//#endif
			addCommand( TextField.CLEAR_CMD );
			this.itemCommandListener = this;
		//#endif
		//#if polish.blackberry
			
			this.blackberryDateField = new PolishDateField( 
					System.currentTimeMillis(),
					PolishDateField.getDateFormat( mode, this.timeZone ),
					PolishDateField.EDITABLE );
			this.blackberryDateField.setChangeListener( this );
			this._bbField = this.blackberryDateField;
		//#endif
	}
	
	
	/**
	 * Returns date value of this field. Returned value is
	 * <code>null</code> if field  value is not initialized. 
	 * The date object is constructed according the rules of
	 * locale specific calendaring system and defined time zone.
	 * 
	 * In <code>TIME</code> mode field the date components are set to
	 * the &quot;zero
	 * epoch&quot; value of January 1, 1970. If a date object that presents time
	 * beyond one day from this &quot;zero epoch&quot; then this field
	 * is in &quot;not initialized&quot; state and this method returns <code>null</code>.
	 * 
	 * In <code>DATE</code> mode field the time component of the calendar is set
	 * to zero when
	 * constructing the date object.
	 * 
	 * @return date object representing time or date depending on input mode
	 * @see #setDate(java.util.Date)
	 */
	public Date getDate()
	{
		return this.date;
	}

	/**
	 * Sets a new value for this field. <code>null</code> can be
	 * passed to set the field
	 * state to &quot;not initialized&quot; state. The input mode of
	 * this field defines
	 * what components of passed <code>Date</code> object is used.<p>
	 * 
	 * In <code>TIME</code> input mode the date components must be set
	 * to the &quot;zero
	 * epoch&quot; value of January 1, 1970. If a date object that presents time
	 * beyond one day then this field is in &quot;not initialized&quot; state.
	 * In <code>TIME</code> input mode the date component of
	 * <code>Date</code> object is ignored and time
	 * component is used to precision of minutes.<p>
	 * 
	 * In <code>DATE</code> input mode the time component of
	 * <code>Date</code> object is ignored.<p>
	 * 
	 * In <code>DATE_TIME</code> input mode the date and time
	 * component of <code>Date</code> are used but
	 * only to precision of minutes.
	 * 
	 * @param date new value for this field
	 * @see #getDate()
	 */
	public void setDate( Date date)
	{
		//#if polish.blackberry
			if (this.blackberryDateField != null && date != this.date ) {
				Object bbLock = UiApplication.getEventLock();
				synchronized (bbLock) {
	                if (date != null) {
	                    this.blackberryDateField.setDate( date.getTime() );
	                } else {
	                    this.blackberryDateField.setDate( System.currentTimeMillis() );
	                }
				}
			}
		//#endif
		if ( date != null && this.inputMode == TIME) {
			// check if the year-month-day is set to zero (so that the date starts at 1970-01-01)
			// 1 day =
			// 1000 // == 1 sec
			// * 60 // == 1 min
			// * 60 // == 1 hour 
			// * 24 // == 1 day
			// = 86.400.000 ==  0x5265C00
			if ( date.getTime() > 86400000 ) {
				if (this.calendar == null) {
					this.calendar = Calendar.getInstance();
					this.calendar.setTimeZone(this.timeZone);
				}
				this.calendar.setTime(date);
				long timeOnly = this.calendar.get( Calendar.MILLISECOND )
					+ this.calendar.get( Calendar.SECOND ) * 1000
					+ this.calendar.get( Calendar.MINUTE ) * 60 * 1000
					+ this.calendar.get( Calendar.HOUR ) * 60 * 60 * 1000;
				date.setTime(timeOnly);
				//System.out.print("Adjusting date from " + this.calendar + " to " );
				//this.calendar.setTime(date);
				//System.out.println( this.calendar );
			}
		}
		this.date = date;
		//#if ! tmp.directInput
		if (this.midpDateField != null) {
			this.midpDateField.setDate( date );
		}
		//#endif
		// set date:
		if (date == null ) {
			if (this.inputMode == DATE) {
				//#if polish.DateFormatEmptyText:defined
					//#= this.text = "${polish.DateFormatEmptyText}";
				//#elif polish.DateFormat == us || polish.DateFormat == mdy
					this.text = "MM-DD-YYYY";
				//#elif polish.DateFormat == de
					this.text = "TT.MM.JJJJ";
				//#elif polish.DateFormat == fr
					this.text = "JJ/MM/AAAA";
				//#elif polish.DateFormat == dmy
					this.text = "DD-MM-YYYY";
				//#else
					// default to ymd
					this.text = "YYYY-MM-DD";
				//#endif
			} else if (this.inputMode == TIME) {
				this.text = "hh:mm";
			} else {
				//#if polish.DateFormatEmptyText:defined
					//#= this.text = "${polish.DateFormatEmptyText} hh:mm";
				//#elif polish.DateFormat == us || polish.DateFormat == mdy
					this.text = "MM-DD-YYYY hh:mm";
				//#elif polish.DateFormat == de
					this.text = "TT.MM.JJJJ hh:mm";
				//#elif polish.DateFormat == fr
					this.text = "JJ/MM/AAAA hh:mm";
				//#elif polish.DateFormat == dmy
					this.text = "DD-MM-YYYY hh:mm";
				//#else
					// default to ymd
					this.text = "YYYY-MM-DD hh:mm";				
				//#endif
			}
		} else {
			if (this.calendar == null) {
				this.calendar = Calendar.getInstance();
				this.calendar.setTimeZone(this.timeZone);
			}
			this.calendar.setTime(date);
			StringBuffer buffer = new StringBuffer(10);
			if ((this.inputMode == DATE) || (this.inputMode == DATE_TIME)) {
				int year = this.calendar.get(Calendar.YEAR);
				int month = this.calendar.get( Calendar.MONTH );
				int day = this.calendar.get( Calendar.DAY_OF_MONTH );
				//#if polish.DateFormat == us
					if (month < 9) {
						buffer.append('0');
					}
					buffer.append( ++month )