d.

so say i actually want to use two or even more scrollbars, say for, instances of a kind of “panel” rather than the overall app -
obviously there are requirements then for masks for each “content” clip that needs a scrollbar, and so forth, and, that that will all be reflected in the scrollbars methods in regard of height calculations and so on,
and, crucially it can no longer be a singleton -
but here’s something i’ve never been fully clear on: if i need any of these panels to come and go (think of them as pop ups perhaps), or be replaced, is there an issue to think about with removing the event listeners? so, if it were not a singleton, and therefore i have instances of scrollbars, is it enough to set what was a variable reference to a scrollbar to null, or does it need a kind of public self-destruct method?

pz