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13-Dec-2016 |
Chris Banes <chrisbanes@google.com> |
Nested scrolling++
This CL adds a number of overloads for the support
implementation of the nested scrolling APIs, to
add the 'type' parameter. This allow developers to
differentiate between direct touch scrolls, and
other non-direct scrolls. Primarily this is to support
dispatching the nested scrolling APIs from when a
scrolling view settles from a fling.
NestedScrollView and RecyclerView have both been updated
to dispatch these events from a fling settle. AppBarLayout
has also been updated to consume these new events.
The way the interfaces have been implemented allow us to
be API compatible without breaking anyone. Yes, the names
are fugly but so be it. If developers wish to support the
new APIs they just need to change the interface they
implement.
This CL also fixes some scroll issues in NSV and RV:
- NSV: fling not starting if scroll is completely
consumed (since it doesn't think it is dragging).
- RV: intercept setting the wrong X/Y start values
sometimes causing flinging in the wrong direction.
BUG: 22780822
Test: included for RV
Change-Id: I37de005e4fb33b5b443852058f3e1ab22ef98e20
/frameworks/support/compat/java/android/support/v4/view/NestedScrollingParent.java
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