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ScrollView snapToOffsets

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Summary:
* Added snapToOffsets prop to ScrollView. Allows snapping at arbitrary points.

* Fixed pagingEnabled not being overridden by snapToInterval on iOS.

* Fixed Android *requiring* pagingEnabled to be defined alongside snapToInterval.
* Added support for decelerationRate on Android.

* Fixed snapping implementation. It was not calculating end position correctly at all (velocity is not a linear offset).
  * Resolves https://github.com/facebook/react-native/issues/20155
* Added support for new content being added during scroll (mirrors existing functionality in vertical ScrollView).

* Added support for snapToInterval.
  * Resolves https://github.com/facebook/react-native/issues/19552

Reviewed By: yungsters

Differential Revision: D9405703

fbshipit-source-id: b3c367b8079e6810794b0165dfdbcff4abff2eda
This commit is contained in:
Oleg Lokhvitsky
2018-08-30 12:59:33 -07:00
committed by Facebook Github Bot
parent 087e2a89fc
commit fd744dd56c
9 changed files with 634 additions and 92 deletions
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1
React/Views/ScrollView/RCTScrollViewManager.m
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@@ -81,6 +81,7 @@ RCT_EXPORT_VIEW_PROPERTY(zoomScale, CGFloat)
RCT_EXPORT_VIEW_PROPERTY(contentInset, UIEdgeInsets)
RCT_EXPORT_VIEW_PROPERTY(scrollIndicatorInsets, UIEdgeInsets)
RCT_EXPORT_VIEW_PROPERTY(snapToInterval, int)
RCT_EXPORT_VIEW_PROPERTY(snapToOffsets, NSArray<NSNumber *>)
RCT_EXPORT_VIEW_PROPERTY(snapToAlignment, NSString)
RCT_REMAP_VIEW_PROPERTY(contentOffset, scrollView.contentOffset, CGPoint)
RCT_EXPORT_VIEW_PROPERTY(onScrollBeginDrag, RCTDirectEventBlock)