1259298 - Improve APZ scroll snap physics

Status: NEW

(Core :: Panning and Zooming, defect, P3)

Description

[Botond Ballo [:botond]]

Now that APZ has knowledge of scroll snap points (bug 1219296), we can change scroll snapping physics in ways that weren't possible before.

Chris suggested a particular change in bug 1219296 comment 20:

(In reply to Chris Lord [:cwiiis] from comment #20)
> It's probably follow-up, but I suggest that the behaviour for snap points
> should act like magnetism - whereby every snap point has a certain attract
> force, and once the momentum of the fling is too low, it won't escape this
> force. This will give the sensation to the user of being able to 'feel' each
> snap point, as well as be consistent with our overscroll oscillation bounce
> effect. It would be a really nice bit of polish that would put us ahead of
> other browsers' behaviour here.

Filing this bug to track that change.

Comment 1

[Botond Ballo [:botond]]

cc'ing Markus who IIRC had some thoughts on what our scroll snap physics should be like.

Comment 2

[Botond Ballo [:botond]]

> (In reply to Chris Lord [:cwiiis] from comment #20)
> > I suggest that the behaviour for snap points
> > should act like magnetism - whereby every snap point has a certain attract
> > force

To be able to represent this, we'll need bug 1282245 fixed first.