Summary:
Exposing this enum is essentially useless and at worst is a runtime cost that isn't necessary by just using the string.
The value of this enum, as far as I understand it, is to enforce that only valid options are used. We can enforce this at build time with Flow.
I was able to migrate our codebase with a few Find and Replace for things like
```
resizeMode={Image.resizeMode.contain}
```
Reviewed By: yungsters
Differential Revision: D7983982
fbshipit-source-id: ddd7024023f8d2f01aad1fff6c8103983a1bec1a
Summary:
Fixes Xcode console output for web socket connections. Apple uses OSLog for logging within libnetworking starting 11.3+. The old way we hook into logging to prevent it will not work anymore.
Let's hook into `__nwlog_pack` that is exclusively used by libnetworking and prevent the logging in there.
Closes https://github.com/facebook/react-native/pull/18948
Reviewed By: fkgozali
Differential Revision: D7940969
Pulled By: mmmulani
fbshipit-source-id: a61beea34377044bfad7e3c446b2ec1138d6d1f5
Summary:
`FlatList` (actually `VirtualizedList`) allows recursive nesting of itself for easy and complex composition of lists such that it can support seemless virtualization and VPV events. It does this by only rendering a `ScrollView` for the outermost `VirtualizedList` and simply stacking `View`s for all the internal ones.
However, if a `Modal` is in a `FlatList` and also hosts a `FlatList`, e.g.:
```
<FlatList ListFooterComponent={<Modal><Foo /></Modal>} />
```
Then React context will propogate through to the inner `FlatList` and cause it to render as a plain `View`. Because the `Modal` actually portals the views into a different native hierarchy, one without a `ScrollView`, the `FlatList` won't scroll as expected.
The fix is to wipe out the context - not sure if there is a better way, but this doesn't seem terrible.
Differential Revision: D7863625
fbshipit-source-id: 38f41d72ed32b9f0eb1c9c82893f21d83a83f9ad
Summary:
VirtualizedList sets high priority rendering when scrolled to the top of a list even if the bottom of the rendered list is still far away and there's nothing further to render above. This causes severe non-responsiveness while dozens of items are waiting to be rendered and user inputs can't get through.
The fix is simply to not consider it high priority to render more items when we reach the top and the first item has already been rendered, or when we reach the bottom and the last item has been rendered.
The code change just splits the two cases (hitting the top and bottom) instead of combining them into one.
I wrote a small application that switches between two FlatLists.
Demo of the original VirtualizedList
<img src="https://user-images.githubusercontent.com/3090032/39456709-2c87069e-4d1b-11e8-8535-5bda6d59400c.gif" width="270" height="480">
I'm clicking pretty often on the button, but you can see that it only switches lists a split second after the rendering is all done because the javascript thread was being blocked.
Demo of the fixed VirtualizedList
<img src="https://user-images.githubusercontent.com/3090032/39456844-00312448-4d1c-11e8-805f-cbe17aa3f95e.gif" width="270" height="480">
You can see this one is significantly more responsive than the previous one.
The source code for the demo application is available [here](https://gist.github.com/jabbawookiees/ba93a4e7b4f9b8f3acbc157e4fd04877)
[ GENERAL ] [ ENHANCEMENT ] [ Libraries/Lists/VirtualizedList.js ] - Prevent high priority rendering at the top or bottom of a list.
Closes https://github.com/facebook/react-native/pull/19081
Differential Revision: D7933994
Pulled By: sahrens
fbshipit-source-id: 13c9f73baeb3487620b720854a753287ac0aa1fa
