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rename and extend new maintain visible content position feature

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Summary:
Builds off of cae7179c94

- Make the prop a dictionary for more configuration options
- Rename `maintainPositionAtOrBeyondIndex` -> `maintainVisibleContentPosition` + `minIndexForVisible`
- Add autoscroll threshold feature

Given the async native of RN JS and background layout, there is no way to trigger the scrollTo from JS without risking a delay, so we add the feature in native code.

== Test Plan ==
ScrollViewExample:
https://youtu.be/pmY8pxC9PRs

Reviewed By: shergin

Differential Revision: D6729160

fbshipit-source-id: 70f9bae460ce84567857a4f696da78ce9b3b834c
This commit is contained in:
Spencer Ahrens
2018-01-18 13:51:43 -08:00
committed by Facebook Github Bot
parent 7e7d00aebe
commit 65184ec6b0
5 changed files with 56 additions and 22 deletions
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2
React/Views/ScrollView/RCTScrollViewManager.m
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@@ -62,7 +62,7 @@ RCT_EXPORT_VIEW_PROPERTY(bounces, BOOL)
RCT_EXPORT_VIEW_PROPERTY(bouncesZoom, BOOL)
RCT_EXPORT_VIEW_PROPERTY(canCancelContentTouches, BOOL)
RCT_EXPORT_VIEW_PROPERTY(centerContent, BOOL)
RCT_EXPORT_VIEW_PROPERTY(maintainPositionAtOrBeyondIndex, NSNumber)
RCT_EXPORT_VIEW_PROPERTY(maintainVisibleContentPosition, NSDictionary)
RCT_EXPORT_VIEW_PROPERTY(automaticallyAdjustContentInsets, BOOL)
RCT_EXPORT_VIEW_PROPERTY(decelerationRate, CGFloat)
RCT_EXPORT_VIEW_PROPERTY(directionalLockEnabled, BOOL)