Refactor PointerEvent emitting into its own gesture recognizer

Summary:
Changelog: [iOS][Internal] - Refactor PointerEvent emitting into its own gesture recognizer

In doing some exploration of a full e2e implementation of the click event I found pretty early on the necessity of addressing the pointerCancel on scroll functionality which, to implement properly without degrading the existing touch gesture handler — involves extracting all the pointer event handling code written so far into its own gesture handler so it can "fail" (when a scroll view wants to take priority) without affecting the existing touch handlers.

This diff is only a refactor and doesn't add/change any new functionality.

allow-large-files

Reviewed By: sammy-SC

Differential Revision: D43372806

fbshipit-source-id: e16f75121fd121d3f82ab43cfc6fab0629654f26

Author: vincentriemer

React/Fabric/RCTSurfacePointerHandler.h

@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface RCTSurfacePointerHandler : UIGestureRecognizer
+
+/*
+ * Attaches (and detaches) a view to the touch handler.
+ * The receiver does not retain the provided view.
+ */
+- (void)attachToView:(UIView *)view;
+- (void)detachFromView:(UIView *)view;
+
+/*
+ * Offset of the attached view relative to the root component in points.
+ */
+@property (nonatomic, assign) CGPoint viewOriginOffset;
+
+@end
+
+NS_ASSUME_NONNULL_END