Screen overlay / pseudo full screen


#1

Hi, I’m trying to develop an app for capturing screenshots, but i have no idea how to create a window that will be drawn above everything (including dock and menu bar), so i can draw over it.

I need this for selecting a region to capture, similar to this: http://www.imore.com/sites/imore.com/files/styles/xlarge_wm_brw/public/field/image/2015/06/how-to-screenshot-mac-os-x_0.jpg?itok=Z9C2urvn

Real full screen is not suitable as there is really long animation.