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James Reggio 9733b92f3d Add `onScrollToTop` to ScrollView for iOS (#21204) 
Summary:
This PR exposes the `onScrollToTop` event on iOS using the same event-forwarding infrastructure as other ScrollView events. (As such, its `nativeEvent` object reflects the same fields as other ScrollView events.)

Motivation:
----------

If your app is only interested in knowing the position of a ScrollView after a scroll has completed, it can use `onScrollEndDrag` and `onMomentumScrollEnd` to inspect the `contentOffset` after a drag-initiated scroll has finished. (This is much less expensive than observing the `onScroll` event if you only want to know the end position.) However, neither of these `End` events fire if the ScrollView is scrolled to the top by tapping the status bar.

By exposing `onScrollToTop`, it is now possible for an app to cheaply know when such a scroll has completed.
Pull Request resolved: https://github.com/facebook/react-native/pull/21204

Differential Revision: D9943618

Pulled By: hramos

fbshipit-source-id: ac5ee42b7f12d94655ffda617f8f811138da7f6f
 		2018-09-19 11:17:30 -07:00
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SafeAreaView SafeAreaView: A new prop `emulateUnlessSupported` that turns off the custom implementation of `safeAreaInsets` insets 2018-09-11 21:19:18 -07:00
ScrollView Add `onScrollToTop` to ScrollView for iOS (#21204) 2018-09-19 11:17:30 -07:00
RCTActivityIndicatorView.h Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
RCTActivityIndicatorView.m Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
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RCTActivityIndicatorViewManager.m Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
RCTAnimationType.h Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
RCTAutoInsetsProtocol.h Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
RCTBorderDrawing.h Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
RCTBorderDrawing.m Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
RCTBorderStyle.h Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
RCTComponent.h Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
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RCTConvert+CoreLocation.h Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
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RCTDatePicker.h Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
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RCTFont.h Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
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RCTLayout.h Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
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RCTMaskedView.h Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
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RCTModalHostView.h Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
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RCTPicker.h Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
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RCTRefreshControl.h Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
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RCTRefreshControlManager.h Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
RCTRefreshControlManager.m Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
RCTRootShadowView.h Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
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RCTSegmentedControl.h Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
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RCTSegmentedControlManager.h Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
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RCTShadowView+Internal.h Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
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RCTShadowView+Layout.h Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
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RCTTextDecorationLineType.h Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
RCTView.h Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
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RCTWKWebView.h Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
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RCTWebView.h Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
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RCTWebViewManager.h Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
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RCTWrapperViewController.h Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
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UIView+Private.h Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
UIView+React.h Update copyright headers to yearless format 2018-09-11 15:33:07 -07:00
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