> I have a list, currently in a Fl_Scroll. Now I use the scrollbar to move the list up/down.
> I want this to be scrollable by clicking+dragging like I do on my mobile-phone.

> What would be the best approach to achieve this ?

(ASIDE: I'm not clear why you need a scroll to contain your list - an Fl_Browser can contain a list, and will handle scroll bars and etc. "automatically" for you anyway...)

Anyway:

You have to subclass your widget, then in the handle() method catch the drag operations and use them to move the view about...

I was going to say that the "offscreen" test does this, but in fact it doesn’t use a Fl_Scroll as the container so it's not exactly what you want. The basic mechanism would be very similar, though.

Also, Greg's draggable box demo : http://www.seriss.com/people/erco/fltk/#DraggableBoxes address the same sort of thing, though again not using an Fl_Scroll.


"Somewhere" (AKA "on a machine I do not have access too because of lockdown"...) I have some widgets I made for touch interaction, scroll wheels and the like, that again might be useful, but... It is possible I have posted some of those here in the past, but I have no clue what terms to search for!

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