TextArea mouseover 实现特定行 tooltip

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我是靠谱客的博主追寻麦片，最近开发中收集的这篇文章主要介绍TextArea mouseover 实现特定行 tooltip，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

function mOver(evt:MouseEvent):void{
                            myTextArea = evt.target as TextArea;
                            var lineHeight:Number;
                            if(myTextArea.getLineMetrics(0)!=null)
                                lineHeight = myTextArea.getLineMetrics( 0 ).height;

                            mChars = Math.ceil(myTextArea.length);
                            var textHeight:Number = myTextArea.textHeight;
                            numLines = Math.ceil( textHeight/lineHeight );

                            //overLine = myTextArea.getLineMetrics(mouseLine) as String;
                            vScrollPos = myTextArea.verticalScrollPosition;
                            mouseLine = Math.ceil( (myTextArea.mouseY )/lineHeight + myTextArea.verticalScrollPosition);

                            var tf:TextField = myTextArea.mx_internal::getTextField();
                            if((mouseLine>=1) && (mouseLine<=numLines))
                                overLine = tf.getLineText(mouseLine-1);


                            if(overLine.indexOf("tooltip") != -1)
                                myTextArea.toolTip = "这个是ToolTip";
                            else
                                myTextArea.toolTip = "";

                            //trace("lineHeight="+lineHeight);
                        }