Question

Flash 问题，请问 TextField 动态文本框 如何获取当前光标所在的行数？

Answer 1

//TextField类的方法：getLineIndexAtPoint(x:Number, y:Number):int
//在 x 和 y 参数指定的位置返回从零开始的行索引值。
package {
    import flash.display.Sprite;
    import flash.text.TextField;
    import flash.events.MouseEvent;
    import flash.text.TextFormat;
    import flash.text.TextFieldAutoSize;

    public class TextField_getLineIndexAtPointExample extends Sprite {
        private var poem:TextField = new TextField();
        private var poemCopy:TextField = new TextField();
        
        public function TextField_getLineIndexAtPointExample() {
            poem.border = true;
            poem.autoSize = TextFieldAutoSize.LEFT;
            poem.x = 10;
            poem.wordWrap = false;

            poemCopy.height = 250;
            poemCopy.width = 270;
            poemCopy.y = 230;
            poemCopy.x = 10;
            poemCopy.background = true;
            poemCopy.border = true;
            poemCopy.wordWrap = false;
            
            poem.appendText("Let me not to the marriage of true minds\n"
                              + "Admit impediments. love is not love\n"
                              + "Which alters when it alteration finds\n"
                              + "Or bends with the remover to remove:\n"
                              + "O no! it is an ever-fixed mark\n" 
                              + "That looks on tempests and is never shaken;\n"
                              + "It is the star to every wandering bark,\n"
                              + "Whose worth's unknown, although his height be taken.\n"
                              + "Love's not Time's fool, though rosy lips and cheeks\n"
                              + "Within his bending sickle's compass come:\n"
                              + "Love alters not with his brief hours and weeks,\n"
                              + "But bears it out even to the edge of doom.\n"
                              + "If this be error and upon me proved,\n"
                              + "I never writ, nor no man ever loved.");

           poem.addEventListener(MouseEvent.CLICK, clickHandler); 

           this.addChild(poem); 
           this.addChild(poemCopy);
        }
    
        private function clickHandler(e:MouseEvent):void {
                var index:int = poem.getLineIndexAtPoint(e.localX, e.localY);
                var s:String;

                s = poem.getLineText(index);
                poemCopy.appendText(s + "\n");
        }
    }
}

Answer 2

as3.0代码

var txt:TextField = new TextField();
var lineIndex:uint = txt.getLineIndexOfChar(txt.caretIndex);//得到光标所在的行数，行数从0开始计起