Summary:
Changelog: [internal]
This is a mechanism that will guess event's React priority based on other events ongoing on the platform.
If an event happens within span of ContinuousStart -> ContinuousEnd and its category is unspecified, we deduce it's React priority to be default. All other events are discrete.
Special case: `onScroll`, which is always treated as "Default".
Reviewed By: JoshuaGross
Differential Revision: D28485060
fbshipit-source-id: d2eae63dbcf03271dfed97128a1590dd165a3ce2
Summary:
TL;DR: simplify and delete a bunch of stuff that shouldn't be necessary in Fabric.
I discovered that this event dispatcher (and the older one this is based on) is triple-queueing: we queue events into "staging", and then post "dispatch events" to only run /on the JS thread/. Even in Fabric. Then, each of these events is emitted into C++ where they are queued /again/! This refactor eliminates one more level of queueing - instead of scheduling dispatch for the JS thread, we just emit them directly to C++ when they're received in Java.
Unfortunately, the EventDispatcher is also used to drive AsyncEventBeat in C++:
1. EventBeatManager.onBatchEventDispatched: https://fburl.com/diffusion/qf6dyhsw
In the C++ impl, it indirectly will drive the AsyncEventBeat/AsyncEventBeatV2.
2. onBatchEventDispatched is ONLY called from EventDispatcherImpl: https://fburl.com/codesearch/mxk8ifyj
3. Which is queued and only runs on the JS thread: https://fburl.com/codesearch/czvbst4u
This means the AsyncEventBeat is only ticked when the JS thread is free, and ticks will be skipped when the JS thread is occupied for long periods.
Now, in this refactor, when this class is used it will drive AsyncEventBeat on every UI tick. This is also potentially not correct. On iOS (Fabric), AsyncEventBeat is driven when the UI thread is "about to sleep".
For now I'm not going to worry about that detail - it is significant, but Fabric+Android is currently /not doing the right thing/ and it's not clear that we want to maintain iOS behavior. This is something we need to discuss further and figure out.
Changelog: [Internal]
Reviewed By: mdvacca
Differential Revision: D28654033
fbshipit-source-id: b3cb9b706343c8dd3c4cf84f24388908c57e2138
Summary:
Changelog: [internal]
EventPriority is backed by int, passing it by reference doesn't provide any performance benefits. Quite contrary, it can make it slower because of indirectness (in our case it is probably negligible).
Reviewed By: mdvacca
Differential Revision: D27938600
fbshipit-source-id: 37d1312627dd5a8f9012dfb35d21afe716a16ad7
Summary:
This diff removes the inner folder of react/renderer/core, moving all its files into react/renderer/core
This is necessary to simplify the compilation of Fabric in OSS
More details: https://fb.quip.com/amaRA631DX3K
changelog: [internal] Internal
Reviewed By: fkgozali, JoshuaGross
Differential Revision: D22875854
fbshipit-source-id: e2d969c3ec67eab1bbdc9288e5a4285c740fa944
Samuel Susla
Joshua Gross
David Vacca