Fabric: Introducing `RawEvent`

Summary:
@public
RawEvent represents ready-to-dispatch event data, an event that can be processed uniformly.

Reviewed By: mdvacca

Differential Revision: D8886235

fbshipit-source-id: 1c905517814330c5ecbf39f0ebc95ff2b576d1f2

ReactCommon/fabric/events/RawEvent.cpp

@@ -0,0 +1,29 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#include "RawEvent.h"
+
+namespace facebook {
+namespace react {
+
+RawEvent::RawEvent(
+  const std::string &type,
+  const folly::dynamic &payload,
+  const EventTarget &eventTarget,
+  const std::function<bool()> &isDispatchable
+):
+  type(type),
+  payload(payload),
+  eventTarget(eventTarget),
+  isDispachable_(isDispatchable) {}
+
+bool RawEvent::isDispachable() const {
+  return isDispachable_();
+}
+
+} // namespace react
+} // namespace facebook

ReactCommon/fabric/events/RawEvent.h

@@ -0,0 +1,48 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+#pragma once
+
+#include <memory>
+
+#include <folly/dynamic.h>
+#include <fabric/events/primitives.h>
+
+namespace facebook {
+namespace react {
+
+/*
+ * Represents ready-to-dispatch event data.
+ */
+class RawEvent {
+
+public:
+  using RawEventDispatchable = std::function<bool()>;
+
+  RawEvent(
+    const std::string &type,
+    const folly::dynamic &payload,
+    const EventTarget &eventTarget,
+    const RawEventDispatchable &isDispachable
+  );
+
+  const std::string type;
+  const folly::dynamic payload;
+  const EventTarget eventTarget;
+
+  /*
+   * Returns `true` if event can be dispatched to `eventTarget`.
+   * Events that associated with unmounted or deallocated `ShadowNode`s
+   * must not be dispatched.
+   */
+  bool isDispachable() const;
+
+private:
+  const RawEventDispatchable isDispachable_;
+};
+
+} // namespace react
+} // namespace facebook