Slide finger vertically to open fragments

I would like to achieve fragments navigation like this:

When I slide finger down somewhere on fragment A, fragment C will be opened (as slide movement), to go back to A slide finger up from C and so on...

I thought about custom ViewPager with vertical swipe direction but I have problem with "Open .." triangles, it should be shared between fragments end rotated during slide movement to change from for example "Open C" to "Open A". Any suggestions ? :)

from Slide finger vertically to open fragments