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/**
 *  vnkeys - support typing Vietnamese in flash input without preinstalled software
 *  Copyright (C) 2009  Nguyen Van Nhu
 *
 *  This program 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 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 * 
 */
package org.vnmedia.flex
{
	import flash.events.KeyboardEvent;
	import flash.events.TextEvent;
	import flash.text.TextField;
	
	import mx.controls.TextArea;
	
	import org.vnmedia.vnkeys.IKeyConverter;
	import org.vnmedia.vnkeys.KeyConverter;
	import org.vnmedia.vnkeys.mapping.ReplacedWord;
	import org.vnmedia.vnkeys.mapping.VNIMap;

	public class FlexTextArea extends TextArea
	{
		private var converter:KeyConverter;
		/**
		 * This is a text copy of TextArea
		 * This is a special solution for Flex TextArea and TextInput  
		 */		
		private var cpField:TextField;
		
		/**
		 * Keep the latest TextEvent(TEXT_INPUT)
		 */
		private var eTextEvent:TextEvent;
		
		public function FlexTextArea() {
			super();
			this.initKeyConveter();
			this.addEventListener(KeyboardEvent.KEY_UP,this.onKeyUp);
			this.addEventListener(TextEvent.TEXT_INPUT,this.onTextEvent);
						
		}
		
		private function initKeyConveter():void {
			this.cpField = new TextField();
			this.converter = new KeyConverter(this.cpField, VNIMap.NAME);
		}
		/**
		 * Return KeyConverter for mainly switching on/off
		 * 
		 * @return IKeyConverter
		 * 
		 */	
		public function getKeyConverter():IKeyConverter {
			return this.converter;
		}
		/**
		 * This is for setting mapping type via flex syntax
		 * <flex:FlexTextArea id="area" vnkeyType="VNI" 
		 *    height="50" width="220" x="50" y="50" />
		 * 
		 * @param type 
		 * 
		 */	
		public function set vnkeyType(type:String):void {
			this.converter.setMapType(type);
		}
		
		/**
		 * 
		 * First converting, then remove the latest text-input
		 * 
		 * @param e
		 * 
		 */
		private function onKeyUp(e:KeyboardEvent):void {
			this.cpField.text = this.text;
			this.cpField.setSelection(this.textField.caretIndex - 1,this.textField.caretIndex-1);
			this.converter.convert(e);
			var word:ReplacedWord = this.converter.getReplacedWord();
			this.converter.replaceWord(this.eTextEvent);
			if (!word.isReversed && word.isReplaced) {
				this.cpField.replaceText(cpField.caretIndex,cpField.caretIndex+1,'');
			}
			this.text = this.cpField.text;
		}
		
		/**
		 *  listen for TextEvent.TEXT_INPUT
		 *  We don't really need this
		 * 
		 * @param e
		 * 
		 */		
		private function onTextEvent(e:TextEvent):void {
			this.eTextEvent = e;// fire earlier; save and wait
		}
	}
}