Summary:
Close#13500
I've been bothered by this issue for quite a long time, finally get some time to look into it.
I find the root cause is that after a prop of the native driven node is assigned with a plain value, if you set it to be a `Animated.Value` again , it will take no effect any more, so I just keep it be a `Animated.Value` all the time.
`value --> Animated.Value (✅) --> value (✅) --> Animated.Value (❌)`
ping janicduplessis
Closes https://github.com/facebook/react-native/pull/13885
Differential Revision: D5077094
Pulled By: javache
fbshipit-source-id: 3fb5d8196d94101200394b2bb2b95c776fb1d2f3
Summary:
This adds support for both automagical sticky section headers in
`SectionList` as well as the more free-form `stickyHeaderIndices` on
`FlatList` or `VirtualizedList`.
The basic concept is to take the initial `stickySectionHeaders` and remap them
to the indices corresponding to the mounted subset in the render window. The
main trick here is that the currently stuck header might itself be outside of
the render window, so we need to search the gap to see if that's the case and
render it (with spacers above and below it instead of one big spacer).
In the `SectionList` we simply pre-compute the sticky headers at the same time
as when we scan the sections to determine the flattened length and pass those
to `VirtualizedList`.
This also requires some updates to `ScrollView` to work in the churny
environment of `VirtualizedList`. We propogate the keys on the children to the
animated wrappers so that as items are removed and the indices of the
remaining items change, react can keep proper track of them. We also fix the
scroll back case where new headers are rendered from the top down and aren't
updated with the `setNextLayoutY` callback because the `onLayout` call for the
next header happened before it was mounted. This is done by just tracking all
the layout values in a map and providing them to the sticky components at
render time. This might also improve perf a little by property configuring the
animations syncronously instead of waiting for the `onLayout` callback. We
also need to protect against stale onLayout callbacks and other fun stuff.
== Test Plan ==
https://www.facebook.com/groups/react.native.community/permalink/940332509435661/
Scroll a lot with and without debug mode on. Make sure spinner
still spins and there are no crashes (lots of crashes during development due
to the animated configuration being non-monotonic if anything stale values get
through). Also made sure that tapping a row to change it's height would
properly update the animation configurations so the collision point would
still be correct.
Reviewed By: yungsters
Differential Revision: D4695065
fbshipit-source-id: 855c4e31c8f8b450d32150dbdb2e07f1a9f9f98e
Summary:
Wrapping them in ScrollViewStickyHeader broken the onLayout and would always give y = 0
because it is now relative to the wrapper.
This uses some not-so-great react magic, but fixes the bugs with no aparent side-effects.
Note we also need to kill the StaticRenderer wrapper that ListView introduces. I think this was
probably a premature optimization anyway since there are usually not many headers and they are
usually pretty cheap to render. If people care, they can use `shouldComponentUpdate` with the
rendered components.
Reviewed By: yungsters
Differential Revision: D4654622
fbshipit-source-id: 1ea557ef64327d1f4df53b22fedd678da1549288
Summary:
We're seeing ` inputRange must be monotonically increasing -1,0,0,-33,-32 ` which happens when we
have zero height headers, wherever those come from...maybe rendering null?
The math was also off and didn't handle variable height headers correctly, and it was confusing
because it was `setNextHeaderY` with the header y _minus it's height_, which only works
if the prev height was also the same height.
Reviewed By: furdei
Differential Revision: D4649404
fbshipit-source-id: c2c2d438fa0d0b979c2cbdfa5752eaf86c14768b
Summary:
This re-implements sticky headers in JS to make it work on Android.
The only change that was needed was to expose a way to attach a an animated value to an event manually since we can't use the Animated wrapper and `Animated.event` to do it for us because this is implemented directly in the `ScrollView` component. Simply exposed `attachNativeEvent` that takes a ref, event name and event object mapping. This is what is used by `Animated.event`.
TODO:
- Need to check why momentum scrolling isn't triggering scroll events properly on Android.
- Remove native iOS implementation
- cleanup / fix flow
**Test plan**
Test the example list in UIExplorer, test the ListViewPaging example.
Closes https://github.com/facebook/react-native/pull/11315
Differential Revision: D4450278
Pulled By: sahrens
fbshipit-source-id: fec8da2cffce9807d74f8e518ebdefeb6a708667
Caleb Meredith
Neo
Spencer Ahrens
Janic Duplessis