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Vincent Riemer
37fee66680
Summary: Pull Request resolved: https://github.com/facebook/react-native/pull/38505 Changelog: [Internal] - Add initial Pointer Capture API implementation This diff introduces the first baseline implementation of pointer capturing through intercepting/modifying Pointer Events in flight through the `PointerEventsProcessor` class. Firstly: This adds and exposes the imperative methods `setPointerCapture`, `releasePointerCapture`, and `hasPointerCapture` which is added to the host `ReadOnlyElement` ref API. These methods are used to manage/query the `pendingPointerCaptureTargetOverrides_` map as [defined in the spec](https://www.w3.org/TR/pointerevents/#setting-pointer-capture). The code is fairly self-explainatory when it comes to retargeting the events in `PointerEventsProcessor::interceptPointerEvent` but when it comes to firing the `gotPointerCapture` and `lostPointerCapture` events those are handled in `PointerEventsProcessor::processPendingPointerCapture` and is a fairly direct implementation of [the spec's pseudocode](https://www.w3.org/TR/pointerevents/#process-pending-pointer-capture). Finally at the end of `interceptPointerEvent` I've included the basics of implicit pointer capture *release* as per [the spec](https://www.w3.org/TR/pointerevents/#implicit-release-of-pointer-capture) (note that implicit pointer capture is not yet implemented). Reviewed By: rozele Differential Revision: D47533366 fbshipit-source-id: 1786f9703a88201bc9c7bde61af76eb4b07a20ee