How to set TextArea height to its content height

Question

I have an mx:TextArea and I want its height to be the same as its content height. There is nothing fancy - just a text area and text that is not editable. I need a simple and reliable way to make the control fit and show all the text without vertical scroll - something like auto resizing. Also my control's text will be set only once and will not change as it will not be editable.

<mx:TextArea id="myTextArea"
             editable="false"
             width="100%"
             verticalScrollPolicy="off" >
   <mx:text>
      Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nulla id lorem 
      quis ante pulvinar auctor at eget risus. Nulla facilisi. Morbi ultricies 
      dignissim lorem, quis suscipit felis ullamcorper et.
   </mx:text>
</mx:TextArea>

There is one more post here on the same topic but it is not relevant to me because the setup there is a lot more complicated as it includes styling and binding.

Solution 1

Use the textHeight read-only property of the TextArea, and set the height of the TextArea to be TextArea.textHeight + whatever vertical padding the TextArea uses plus the height of the top and bottom borders (examine the TextArea component and figure those out). This process should happen in a handler you add to the change event for the TextArea.

Solution 2

Use the following code if you would like to stick with the spark text area component:

<s:TextArea 
   id="myTextArea"
   editable="false"
   width="100%"
   verticalScrollPolicy="off"
   change="myTextArea.height = myTextArea.scroller.viewport.contentHeight + 2;">
    <s:text>
        Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nulla id lorem 
        quis ante pulvinar auctor at eget risus. Nulla facilisi. Morbi ultricies 
        dignissim lorem, quis suscipit felis ullamcorper et.
    </s:text>
</s:TextArea>

Or you can put the change handler in a function.