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Valentin Shergin
934275f931
Summary:
This changes the way we throttle `onLayout` events in Fabric.
The approach we used before has several issues:
* Every event-dispatching action initiated a lambda scheduled on JavaScript thread (which is a bit inefficient).
* If an event had {0,0,0,0} frame, it might be skipped because this is the default frame value.
* An event was always delivered by the exact block scheduled at the moment of the event initiation (even though some other blocks might be called before). In case of events being initiated rapidly, it can delay actual event delivery and maybe even overwhelm the JavaScript thread.
The new implementation uses a different approach: we maintain the shared storage with recent frame value and use the very first opportunity to deliver it. Alse see comments in the code.
Changelog: [Internal] Fabric-specific internal change.
Reviewed By: sammy-SC
Differential Revision: D25676336
fbshipit-source-id: 275b08990f7c5cf1f05a8f954ebc795a14e10ec2