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Allow listeners in EventEmitter #49998

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@rozele rozele commented Mar 12, 2025

Summary:
We have listeners for EventDispatcher, but we don't have any listener capabilities for synchronous hooks from events on the UI thread.

This proposal adds an affordance for generic event listeners that can be attached by the host platform mounting manager, e.g., to wire events to NativeAnimated event drivers.

Changelog

[Internal]

Differential Revision: D71050838

rozele added 2 commits March 12, 2025 13:50
Summary:

NativeAnimated currently depends on folly::dynamic event payloads for event-driven animations. While some events (e.g., ScrollEvent.h) have an `asDynamic` implementation, not all events do. Having the ability to convert an EventPayload to a folly::dynamic defined on the EventPayload implementations precludes generalized event handling in NativeAnimated.

This change moves the `asDynamic` method from `ScrollEvent` to the base `EventPayload` interface, defaulting the implemention to returning a null value.

## Changelog

[Internal]

Reviewed By: zeyap

Differential Revision: D71046682
Summary:
We have listeners for EventDispatcher, but we don't have any listener capabilities for synchronous hooks from events on the UI thread.

This proposal adds an affordance for generic event listeners that can be attached by the host platform mounting manager, e.g., to wire events to NativeAnimated event drivers.

## Changelog

[Internal]

Differential Revision: D71050838
@facebook-github-bot facebook-github-bot added CLA Signed This label is managed by the Facebook bot. Authors need to sign the CLA before a PR can be reviewed. p: Facebook Partner: Facebook Partner labels Mar 12, 2025
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This pull request was exported from Phabricator. Differential Revision: D71050838

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