750857 - Seamlessly switch from panning subdocuments to panning the main document

Status: RESOLVED DUPLICATE of bug 776030

Description

[Kartikaya Gupta (email:[e-mail]) (parental leave)]

This is a follow-up from bug 750722, but is a general issue that might fix other bugs such as 732364.

The basic problem is if you have a page with an iframe, and the user tries to pan the page by putting their finger down on the iframe, we will pan the iframe instead. Once the iframe is panned to the end and can be panned no more, we stop all panning activity; the user then has to lift their finger and put it back down and start panning again to pan the main page.

This bug is to determine whether it makes sense to change our behaviour to allow the user to seamlessy switch from panning the iframe to panning the main document once they reach the end of the iframe. If the answer is yes, we should determine if flings (i.e. high-velocity pans that let the page keep moving after the finger is up) should be propagated to main page as well.

CC'ing ibarlow to get the UX feedback for ^

Comment 1

[Kartikaya Gupta (email:[e-mail]) (parental leave)]

Nom'ing since it sort-of blocks bug 750722 which is a release blocker.

Comment 2

[Mark Finkle (:mfinkle) (use needinfo?)]

not going to block on it, but this is something we want as soon as reasonable.

Comment 3

[Brad Lassey [:blassey] (use needinfo?)]

Kats this is probably a dupe of one of the subframe scrolling bugs you've been working on

Comment 4

[Kartikaya Gupta (email:[e-mail]) (parental leave)]

Yeah APZC implements scroll handoff already so we'll get this for free once we switch. Fling handoff is different, but we have bug 965871 filed for that on the APZC side.