title: How can I theme the color the disabled text form field's label in Flutter?
body: <p>I want to apply a theme in my Flutter app on the disabled text fields' label because the grey color I have right now is quite hard to read.</p>
  
  <p>I'd like to apply it to my entire app, so I'd like to use theming, however, I didn't find any solution that would enable my to customize the label's text style <strong>only if the text form field is disabled</strong></p>
  
  <p><strong>How can I theme and set globally the color the disabled text form field's label in Flutter?</strong></p>
  
  <p>I know how to change the label's text style conditionally, however, I need to remember to always use the same style (or I could wrap the widget, but that sounds also suboptimal). I can customize the label's color via the <code>decoration</code> named parameter, like so:</p>
  
  <pre><code>TextFormField(
    enabled: isEnabled,
    decoration: InputDecoration(
      labelText: 'Value',
      labelStyle: TextStyle(color: isEnabled ? Colors.green : Colors.red),
    ),
    // .... other fields, like controller might come here
  ),
  </code></pre>