title: [Qt]How to support :pressed state of style sheet for custom widget?
body: <p><em><strong>What i have :-</em></strong></p>
  
  <p>I have a custom widget which extends QFrame (instead of QWidget as QFrame already has a working paintEvent implementation). I have overridden the mousePressed() and mouseReleased() to emit the pressed() released() and clicked() Signals. Everything upto this point is woring fine as expected.</p>
  
  <p><em><strong>What i need :-</em></strong></p>
  
  <p>This custom widget is having basic style sheet support and it supports the :hover state just fine.
  But the :pressed state is not working. I have already figured out that this is bcoz its not supported by QFrame/QLabel etc. 
  I wish to know what do i need to do in order to support the :pressed state.
  Should i set some attribute / property on pressed and released OR anything else ?</p>