Summary:
The sorting function currently forms a partial ordering, not a total ordering. This can cause problems with certain sequences of immediate or conflicting mutations, leading to UI corruption or crashes.
Changelog: [Internal]
Reviewed By: shergin
Differential Revision: D24002668
fbshipit-source-id: edc9b4c1e3104897cb0c5fd6da563ec43d800494
Summary:
In this diff I simplify index adjustment and add comments to rigorously describe what we're doing at each step of index adjustment.
I've also made unflattening detection more correct, robust, and slightly more efficient.
Bugs that existed before:
1) The reparenting detection that existed in the animations layer had some subtle bugs. I don't have proof that it results in any correctness issues or crashes, but I suspect it.
2) Correctness of index adjustment: there were cases where the Android mounting layer would crash because LayoutAnimations would try to remove a View at an index, but the index was wrong. This is why I sat down and diagrammed the relationships between all the bits of data we have for index readjustment - I believe this to be correct now.
3) Correctness of INSERT index adjustment: I had the insight that when we have batches of INSERTs to consecutive indices, we essentially want them to be treated as a single INSERT for adjustment purposes, so that they're all placed consecutively in the view layer. I added `ConsecutiveAdjustmentMetadata` to deal with this, and there are more comments in the code.
Changelog: [Internal]
Reviewed By: yungsters
Differential Revision: D23806163
fbshipit-source-id: cd9e94945034db8b840f2a806c6377034a91af61
Summary:
Just renaming, nothing more.
The idea of MountingTelemetry already grown to something bigger than just mounting telemetry, so we are renaming it.
Changelog: [Internal] Fabric-specific internal change.
Reviewed By: mdvacca
Differential Revision: D23374947
fbshipit-source-id: f60ce38b75d1ce77498b84688e59598314c69a78
Summary:
My goal in this diff is to make LayoutAnimations more stable, and more resilient to challenging situations. Namely, LayoutAnimations already works fine with:
1) Reorders
2) Flattening/unflattening
3) Deletion and recreation of the same hierarchy
4) Updates conflicting with an existing animation
However, what if /all/ of those things are combined? Handling update conflicts with multiple ongoing animations, repeatedly flattening/unflattening the same layer of hierarchy and reordering both parents and children, etc .
This diff does not make LayoutAnimations perfect, but it does make LayoutAnimations much more resilient to situations it was not able to handle before.
My primary method of testing was to use two Playground examples: one just repeatedly queues up mutations (some animated, some not) that create, update, and delete in the same hierarchy layer. The second, more complex one, mutates between random view hierarchies that involve a lot of flattening and unflattening as well as reordering, over a depth of 5. It also exercises animations over TextInlineViews, which is more challenging.
LayoutAnimations works best with the new "Flattening Differ" for now, because the Flattening Differ produces a much smaller, nearly minimal set of instructions in cases of flattening-unflattening. I would like that to not be a hard requirement for using LayoutAnimations, but it's a good starting-point for now.
As part of this work, I also developed a lot of debugging and logging mechanisms that are handy for detecting inconsistencies and debugging crashes. Some are included in this diff behind `#define` statements that are disabled by default, and the rest will be published separately and likely cannot be landed permanently, as they're more invasive changes that are only helpful in debugging.
# Followups:
- Automate testing: write a suite of C++ tests that mutates between random diffs and guarantees that all mutations in a StubViewTree are sensible
- Construct a set of minimal repros that catalogues all remaining crashes and inconsistency issues (these seem to be extremely marginal cases and are very hard to repro - so I think it's fine to run this in prod for now, but I will follow-up as soon as I'm back to catalogue and fix all remaining issues)
- This diff focuses on *not crashing*, but it is still possible to construct a sequence of complex mutations that results in (for example) views having some opacity between 0 and 1 if animations are interrupted repeatedly. Although this is easy enough to prevent in product code - the types of scenarios I'm running in tests are very unlikely to ever happen in production - it would be nice to be *sure* that LayoutAnimations will always converge to a sensible View hierarchy with up-to-date props.
- In general, the index adjustment logic is complicated. I don't know if there's a great way around it, so I need to at least catalogue and test all edge-cases as mentioned above.
Changelog: [Internal]
Reviewed By: mdvacca
Differential Revision: D23382975
fbshipit-source-id: f379d9aa2a4b9c33fa2ba8fa07870c9e31fad5e7
Summary:
I've used this while debugging LayoutAnimations a few times. It compiles out to nothing when the define is not set.
Changelog: [Internal]
Reviewed By: mdvacca
Differential Revision: D22962113
fbshipit-source-id: 88b7bb1c20a07a7d804e5c81d31cf871d58bee92
Summary:
Consolidated a few places where index adjustment was happening with nearly identical code. There was also one remaining case where index adjustment should be happening, but was not previously.
Changelog: [Internal]
Reviewed By: mdvacca
Differential Revision: D22962115
fbshipit-source-id: 732c026b5a3c60bb0eadb8d49826ffd6367f7f62
Summary:
Hook up onSuccess and onFailure callbacks to LayoutAnimations.
Note that in non-Fabric RN, onSuccess is not known to work in Android. I could not find any uses of onFailure and it's not documented, so for now, it is only called if the setup of the animation fails.
Changelog: [Internal]
Reviewed By: shergin
Differential Revision: D22889352
fbshipit-source-id: 4306debb350388dd2b7a2cbfe295eb99723988e2
Summary:
This diff moves fabric C++ code from ReactCommon/fabric to ReactCommon/react/renderer
As part of this diff I also refactored components, codegen and callsites on CatalystApp, FB4A and venice
Script: P137350694
changelog: [internal] internal refactor
Reviewed By: fkgozali
Differential Revision: D22852139
fbshipit-source-id: f85310ba858b6afd81abfd9cbe6d70b28eca7415
Joshua Gross
Valentin Shergin
David Vacca