Flutter noob here,

trying to make a photo grid UI exactly the picture above.

There must be only 3 boxes positioned and consider each box is a photo card.
If I got 4 pictures, the bottom right dimmed box shows +1, if 5, then shows +2 and so on.

No less than 3, only have to deal with the 3 boxes with exact same grid layout(the screenshot above) and the number(on the dimmed box).

Thanks in advance.