Apache flex 如何将列表中的文本放到特定的文本输入位置（光标下）？

我知道如何从列表中拖放到textinput控件中。但我不知道如何在textinput中的光标位置下插入文本。例如，我在textinput中有text

qwerty

。我需要在文本输入中删除单词

asdf

。因此，我希望获得文本

qweasdfrty

或

qasdfwerty

，或者根据光标位置获得我想要的任何内容

以下是我已有的简化代码：

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
                xmlns:mx="library://ns.adobe.com/flex/mx"
                layout="absolute"
                minWidth="955"
                minHeight="600">

    <fx:Script>
        <![CDATA[
            import mx.collections.ArrayCollection;

            private function init():void
            {
                horList.dataProvider=new ArrayCollection(["Reading", "Television", "Movies"]);
            }

            import mx.managers.DragManager;
            import mx.core.DragSource;
            import mx.events.DragEvent;
            import flash.events.MouseEvent;

            private function dragEnterHandler(event:DragEvent):void {
                if (event.dragSource.hasFormat("items"))
                    DragManager.acceptDragDrop(TextInput(event.currentTarget));
            }

            private function dragOverHandler(event:DragEvent):void
            {
                if (event.dragSource.hasFormat("items"))
                    DragManager.showFeedback(DragManager.COPY);
            }

            private function dragDropHandler(event:DragEvent):void {
                if (event.dragSource.hasFormat("items"))
                {
                    var draggedText:Array = event.dragSource.dataForFormat("items") as Array;

                    var textInput : TextInput = TextInput(event.currentTarget);

                    // here i want to insert the text from (draggedText[0] as String) into textInput

                }                   
            }
        ]]>
    </fx:Script>
    <mx:HorizontalList id="horList"
                       x="10"
                       y="10"
                       width="625"
                       dragEnabled="true"
                       creationComplete="init()">
    </mx:HorizontalList>
    <mx:TextInput id="destTextInput"
                  x="100"
                  y="117"
                  dragEnter="dragEnterHandler(event);"
                  dragOver="dragOverHandler(event);"
                  dragDrop="dragDropHandler(event);"/>

</mx:Application>

---

有什么方法可以做到这一点吗？

下面是一个完整的示例。不幸的是，它需要访问mx_内部名称空间，但应该可以正常运行。它必须使用mx_internal的原因是为了访问IUITextField引用

<fx:Script>
    <![CDATA[
        import mx.collections.ArrayCollection;
        import mx.core.IUITextField;

        //Note use of mx_internal namespace
        import mx.core.mx_internal;
        use namespace mx_internal;

        private function init():void
        {
            horList.dataProvider=new ArrayCollection(["Reading", "Television", "Movies"]);
        }

        import mx.managers.DragManager;
        import mx.core.DragSource;
        import mx.events.DragEvent;
        import flash.events.MouseEvent;

        private function dragEnterHandler(event:DragEvent):void {
            if (event.dragSource.hasFormat("items"))
                DragManager.acceptDragDrop(TextInput(event.currentTarget));
        }

        private function dragOverHandler(event:DragEvent):void
        {
            if (event.dragSource.hasFormat("items"))
                DragManager.showFeedback(DragManager.COPY);
        }

        private function dragDropHandler(event:DragEvent):void {
            if (event.dragSource.hasFormat("items"))
            {
                var draggedText:Array = event.dragSource.dataForFormat("items") as Array;

                var textInput : TextInput = TextInput(event.currentTarget);

                // here i want to insert the text from (draggedText[0] as String) into textInput

                //Using mx_internal namespace to gain access to internal textfield
                var tf:IUITextField = textInput.getTextField();
                var charIndex:int = tf.getCharIndexAtPoint(textInput.contentMouseX, textInput.contentMouseY);

                //dropped after end of text
                if(charIndex == -1 && mouseX > tf.textWidth)
                {
                    tf.appendText(draggedText[0]);
                }
                //Dropped at beginning of field (only happens when it is empty)
                else if(charIndex == -1 && mouseX < tf.textWidth)
                {
                    tf.text = draggedText[0];
                }
                //dropped inline to text
                else
                {
                    tf.replaceText(charIndex, charIndex, draggedText[0]);
                }
            }                   
        }
    ]]>
</fx:Script>
<mx:HorizontalList id="horList"
                   x="10"
                   y="10"
                   width="625"
                   dragEnabled="true"
                   creationComplete="init()">
</mx:HorizontalList>
<mx:TextInput id="destTextInput"
              x="100"
              y="117"
              dragEnter="dragEnterHandler(event);"
              dragOver="dragOverHandler(event);"
              dragDrop="dragDropHandler(event);"/>

tf.textWidth）
{
tf.appendText（draggedText[0]）；
}
//在字段开头删除（仅在字段为空时发生）
else if（charIndex==-1&&mouseX

---

我已经在TextLineMetrics类的帮助下解决了这个问题。但是谢谢你，你的变体更简单更好。但是当textWidth大于textInput.width并且部分文本被隐藏时会出现问题。在这种情况下，char索引是错误的。