title: React native determine when text is cut off
body: <p>I am using react-native with a limited number of lines, that are shown as <code>...</code> using</p>
  <pre><code>&lt;Text numberOfLines={4}&gt; {myText} &lt;/Text&gt;
  </code></pre>
  <p>Now my issue is, if the text is cut off I would like to show it some special image, to navigate to a new view. I am wondering whether there is a property i can use to test if the text is being cut off?</p>