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Code from Flex 4 Documentation "Using Adobe Flex 4".
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<!-- textcontrols/TextRangeSelectedText.mxml -->
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:mx="library://ns.adobe.com/flex/mx"
xmlns:s="library://ns.adobe.com/flex/spark" width="600" height="500">
<s:layout>
<s:VerticalLayout />
</s:layout>
<fx:Script>
import mx.controls.textClasses.TextRange;
//The following text must be on a single line.
[Bindable]
public var htmlData:String="<textformat leading='2'><p align='left'><font face='_sans' size='12' color='#000000'>This paragraph contains <b>bold</b>, <i>italic</i>, <u>underlined</u>, and <b><i><u>bold italic underlined </u></i></b>text. </font></p></textformat><br><p><u><font face='arial' size='14' color='#ff0000'>a red t.</font></u></p><p align='right'><font face='verdana' size='12' color='#006666'><b>This a teal bold 12-pt. Verdana font with alignment set to right.</b></font></p>";
public function changeSelectionText():void {
//Get a TextRange with the selected text and find its length.
var sel:TextRange = rte1.selection;
var selLength:int = sel.endIndex - sel.beginIndex;
//Do the following only if the user made a selection.
if (selLength) {
//Display the selection size and font color, size, and family.
t1.text="Number of characters selected: " + String(selLength);
t1.text+="\n\nOriginal Font Family: " + sel.fontFamily;
t1.text+="\nOriginal Font Size: " + sel.fontSize;
t1.text+="\nOriginal Font Color: " + sel.color;
//Change font color, size, and family and replace selected text.
sel.text="This is replacement text. "
sel.color="fuchsia";
sel.fontSize=20;
sel.fontFamily="courier"
//Show the new font color, size, and family.
t1.text+="\n\nNew text length: " + String(sel.endIndex - sel.beginIndex);
t1.text+="\nNew Font Family: " + sel.fontFamily;
t1.text+="\nNew Font Size: " + sel.fontSize;
t1.text+="\nNew Font Color: " + sel.color;
}
}
</fx:Script>
<!-- The text area. When you release the mouse after selecting text,
it calls the func1 function. -->
<mx:RichTextEditor id="rte1" htmlText="{htmlData}" width="100%"
height="100%" mouseUp="changeSelectionText()" />
<mx:TextArea id="t1" editable="false" fontSize="12" fontWeight="bold"
width="300" height="180" />
</s:Application>
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