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The bar is probably generated bespoke for the given timing, for 4/4 it'd be four measures of four beats.

Each of these given beats is a drop down (or just input checked against the generic-checker), data-bound to an array in the program.
Each given beat can either be blank or anything in the range of the generics, with each given beat having no bearing on what anything else is. The whole thing can be full of the same note or completely empty.

Once 'start practice' is hit the program will begin generating the scales. It will pick a note randomly from a given set (perhaps allowing the user to pick the first note). The draw pool will be selected by the user from a set of keys. After a set number of iterations for each given scale another key will be selected and a new scale will be generated, shown shortly before the old one fades.

There are several libraries for this sort of thing, main thing is checking to make sure they actually work properly

The way that you go from the generic form to the chord is by checking the number given in the generic and what it corresponds to in the key that was chosen.

For the purposes of translating the generic to the chord, these are the rules:

1.) The roman numeral given corresponds to that scale degree - ie, the third note of C is E, so a III would become E. If there is a # or b before the roman numeral, you can keep it.*

*If the chord you generate with this is Fb, change it to E. If it's Cb, change it to B. If it's E#, change it to F. If it's B#, change it to C.

2.) If the roman numeral is lowercase and neither "m" or "dim" follows it, then immediately following the note you got from the generic should be a lowercase m. If "m" is following it, then you don't need to add another m.

3.) If there are any additional things added to the generic, they are copied directly to the chord form.

4.) If you see an "ma" after an uppercase roman numeral without any number following it, ignore it. If you see an "m", ignore it.

5.) If you see an "ma" following a lowercase roman numeral, if there is no 7 after the ma, that chord is invalid. If there is a 7, then include the include the "ma" with a "/" before it. ie: iima7 -> Dm/ma7