App that mimics a magnetic cover?

[moverton]

I currently own a Surface 2 with a type cover and love the ability to just open the cover and the screen comes on and is ready to go. I've owned an iPad with smart cover and had the same experience with it. I purchased the following case from Amazon - LK Wallet Leather Protector, and love having it instead of my wallet.

Now, after spending years on an iPad and several months on my Surface 2, I keep expecting the screen to turn on every time I open the case. I would LOVE to have this function on my phone. Does anyone know if it is possible to create an app, or if the app already exists, that can mimic the function of a "smart cover" for a phone by using the proximity sensor?

 

[Pete]

You may be able to have an app that creates the illusion of this, but it would only work when the app is actively running on the screen, you won't get an app that does this as a background task.

 

[a5cent]

I'm expecting such a feature from the upcoming McLaren WP device.