title: QML Center window in primary screen
body: <p>I want to put my qml window at center of my primary screen. and as figure shown I have 3 monitor which my primary screen is the middle one.</p>
  
  <p>The problem is x and y properties in qml window are not relative to screen but global. So I cannot use what suggested in <a href="https://stackoverflow.com/questions/8970766/qml-main-window-position-on-start-screen-center">here</a> which is result in window apear on both none primary screen and non center.</p>
  
  <p>I'm looking into some variable contains each screen position in x and y, although just do centering is much more better :)</p>
  
  <p><a href="https://i.stack.imgur.com/NZ1y0.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/NZ1y0.png" alt="My Monitor Configuration"></a></p>