Default My idea for a tabbed Android homescreen

Apologies if this is in the wrong place.

I had an idea for a different type of home screen. I am not an app developer or have any knowledge - just wanted to share and see if something like this already exists. If it does, let me know!

You have the traditional dock, which launches the corresponding app - nothing special. However, if you double-tap the icon, it turns into a "tab" of widgets related to that app.

There are no other home screen panes to slide to, the main screen just "tabs" into relevant widgets.

I'm not sure if I have explained it well enough, or if anything similar already exists (if it does, let me know!) - but take a look at my sketch, and let me know what your thoughts are. Comments and questions welcome.
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Google Nexus 5 (D821)
I am on - KitKat 4.4.2 Stock(-ish), but rooted and ElementalX kernel and TWRP and GravityBox
I was on - [ROM] Slim Bean 4.2.2 Galaxy S2
Before that - [ROM] Chameleon Galaxy S2

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