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扩展TextField,合理计算中文字符长度

AntiquMan — Fri, 03 Jul 2009 06:47:00 GMT

Code

//Copyright © 2009. Http://L4cd.Net All Rights Reserved. 
package net.L4cd.display 
{ 
    import flash.events.Event; 
    import flash.events.TextEvent; 
    import flash.text.TextField; 
    import flash.utils.ByteArray; 
  
    /** 
     * 扩展TextField�c?中文�?字符长度计算 
     * 
     * @author L4cd.Net 
     * @playerversion Flash player 9 
     * @langversion 3.0 
     * @version 2009-06-16 
     */
    public class TextFieldExt extends TextField 
    { 
        private var _maxChars:int = -1; 
        public function TextFieldExt() 
        { 
            super(); 
              
        } 
        override public function get maxChars():int
        { 
            return _maxChars; 
        } 
        override public function set maxChars(value:int):void
        { 
            _maxChars = value; 
            if(maxChars<0) 
            { 
                removeEventListener(TextEvent.TEXT_INPUT,input);       
            }else
            { 
                addEventListener(TextEvent.TEXT_INPUT,input); 
                text = getTextByCharLength(text,maxChars); 
            } 
        } 
        override public function get length():int
        { 
            return getCharLength(text); 
        } 
        private function input(e:TextEvent):void
        { 
            //拦截�q����止textinput事�g,手动处理内容输入 
            var textField:TextField = e.currentTarget as TextField; 
            var temp:String = getTextByCharLength(e.text,maxChars - getCharLength(text) + getCharLength(selectedText)); 
            var index:int = selectionBeginIndex; 
            replaceText(selectionBeginIndex,selectionEndIndex,temp); 
            setSelection(index+temp.length,index+temp.length); 
            dispatchEvent(new Event(Event.CHANGE,true)); 
            e.preventDefault(); 
        } 
        /** 
         * 获取字符长度,一个中文算2长度 
         * @param txt 
         * @return �q�回长度�?
         */    
        private function getCharLength(txt:String):int
        { 
            var byte:ByteArray = new ByteArray(); 
            byte.writeMultiByte(txt,"gb2312"); 
            byte.position = 0; 
            return byte.bytesAvailable; 
        } 
        /** 
         * 截取指定长度的文本内�?一个中文算2长度 
         * @param txt 需要截取的文本 
         * @param length 需要截取的长度 
         * @return 截取后的内容 
         */    
        private function getTextByCharLength(txt:String,length:int):String
        { 
            if(length<1)return ""; 
            var byte:ByteArray = new ByteArray(); 
            byte.writeMultiByte(txt,"gb2312"); 
            byte.position = 0; 
            return byte.readMultiByte(Math.min(length,byte.bytesAvailable),"gb2312"); 
        } 
    } 
}

调用�Ҏ��和普通TextField无异

import net.L4cd.display.TextFieldExt 
var ext:TextFieldExt = new TextFieldExt(); 
ext.maxChars = 15; 
addChild(ext);

一般的输入,�_�脓�{�操作均没问�?.
直接对text�q�行赋值没有进行限�?(原来的TextField也没限制)..
如需限制~可以调用一�ơmaxChars = maxChars卛_��..

AntiquMan 2009-07-03 14:47 发表评论

flex中文日历

AntiquMan — Tue, 16 Jun 2009 11:28:00 GMT

dayNames="[�?一,�?�?�?�?六]" monthNames="[一�?二月,三月,四月,五月,六月,七月,八月,九月,�? 十一�?十二月]" formatString="YYYY-MM-DD"/>

AntiquMan 2009-06-16 19:28 发表评论

flex String 相关处理

AntiquMan — Thu, 11 Jun 2009 06:14:00 GMT

String�c�L��ActionScript中描�q�字�W�串的类. 该类提供了处理字�W�串的属性与�Ҏ��. 可以使用String()�Ҏ��各�U�类型的对象转换为Sring.

String是AS中文本的基础.一个字�W�串由零个或零个以上的字�W�组�?AS支持Unicode和ASCII两种文本�~�码格式.String可以通过直接赋值和new关键字两�U�方式创�?由单引号或双引号表示,必要的时候应使用转义字符’/’.

Public Properties

length:int

�q�回该String的长�?

Public Methods

String(val:String): 构造函�?新徏一个String.

charAt(index:Number=0):Number: �q�回在某个inidex的字�W?br />
charCodeAt(index:Number=0):Number �q�回某个index的字�W�对应的Unicode字符�?br />
concat(..args):Stirng: �q�接两个字符�?

fromCharCode(charCodes):String ��某Unicode字符�?strong style="color: black; background-color: #99ff99">转换为String

indexOf(): 从左向右扑ֈ�的第一个目标的index

lastIndexOf(): 从左向右最后一�?#8230;也就是从叛_��左第一�?

localeCompare(): 判断�q�个字符串是否完全相�? 若返回��gؓ0,则表�C�相�?其他��D��C�Z��?br />
replace:替换

search(): 从左向右�W�一个目标的index

slice(): �q�回�q�个index之间的String

split(): 使用间隔�W?��String分割为多个String,�q�放入数�l�中.

subStr(): 从某index开始向后的特定数目内返回的String

subString(): �c�M��slice();

Flex代码

public function init():void {
var s:String = "liguoliang";
var s1:String = ".com";
var s2:String = "liguoliang";
trace("s的长�? " + s.length);
trace("�W?个字�W? " + s.charAt(0));
trace("s�q�接s1: " + s.concat(s1));
trace("65对应的char: " + String.fromCharCode(65));
trace("�W�一个l的位�|? + s.indexOf("l"));
trace("从index�?的字�W�开始向��x��到的�W�一个l的index: " + s.indexOf("l",1));
trace("从右向做扑ֈ�的第一个l的index: " + s.lastIndexOf("l"));
trace(s.localeCompare(s2)); //如果�q�回��gؓ�?则表�C�Z��个字�W�串完全相同, 如果�q�回值非�?则表�C�Z��?
trace("��li替换为s2: "+ s.replace("li", s2) + " " + s);
trace("从左向右搜烦到的�W�一个L: " + s.search("l"));
trace("子字�W�串: " + s.slice(0, 1)); //不包括最后一�?..如果参数为空,则置�?1.两参数都为空�?取全�?
trace("子字�W�串:从index�?开�?取两个字�W?nbsp;" + s.substr(0, 2));//也不包括最后一�?..
trace("子字�W�串: " + s.substring(0, 1));
trace(s.split("i")); //�q�回l,guol,ang,若将最大值限制�ؓ2,则表�C�数�l�中�q�放�?/span>2个返回l,guol
}

public function init():void {
var s:String = "liguoliang";
var s1:String = ".com";
var s2:String = "liguoliang";
trace("s的长�? " + s.length);
trace("�W?个字�W? " + s.charAt(0));
trace("s�q�接s1: " + s.concat(s1));
trace("65对应的char: " + String.fromCharCode(65));
trace("�W�一个l的位�|? + s.indexOf("l"));
trace("从index�?的字�W�开始向��x��到的�W�一个l的index: " + s.indexOf("l",1));
trace("从右向做扑ֈ�的第一个l的index: " + s.lastIndexOf("l"));
trace(s.localeCompare(s2)); //如果�q�回��gؓ�?则表�C�Z��个字�W�串完全相同, 如果�q�回值非�?则表�C�Z���?
trace("���li替换为s2: "+ s.replace("li", s2) + "  " + s);
trace("从左向右搜烦到的�W�一个L: " + s.search("l"));
trace("子字�W�串: " + s.slice(0, 1)); //不包括最后一�?..如果参数为空,则置�?1.两参数都为空�?取全�?
trace("子字�W�串:从index�?开�?取两个字�W?" + s.substr(0, 2));//也不包括最后一�?..
trace("子字�W�串: " + s.substring(0, 1));
trace(s.split("i")); //�q�回l,guol,ang,若将最大值限制�ؓ2,则表�C�数�l�中�q�放�?个返回l,guol
}

字符串大��写转换:flexstr.toLowerCase(); flexstr.toUpperCase();

其他对象转换为String.在默认情况下,所有的AS对象都可�?strong style="color: black; background-color: #99ff99">转换为String�c�d��.每一个类都有一个toString�Ҏ��.

通过toString可以��对�?strong style="color: black; background-color: #99ff99">转换为String.

AntiquMan 2009-06-11 14:14 发表评论