Can't find example on "item frame"

I am new to forum but i have no idea on how to code a "item frame" 

which displays in-game items on a shelf "block" (in my 2d pixel art game)

Such as i have a sword item and i wanna place it in the "display shelf" block, i will select the "sword" and i click on the "shelf" then the sword will be move onto the shelf and the sword item icon will be display.

I cant find any tutorial on the internet so i decided to ask here, thanks.