split project with app & doric module

doric-Qt/example/doric/yoga/event/event.cpp

@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#include "event.h"
+#include <atomic>
+#include <memory>
+
+namespace facebook {
+namespace yoga {
+
+const char* LayoutPassReasonToString(const LayoutPassReason value) {
+  switch (value) {
+    case LayoutPassReason::kInitial:
+      return "initial";
+    case LayoutPassReason::kAbsLayout:
+      return "abs_layout";
+    case LayoutPassReason::kStretch:
+      return "stretch";
+    case LayoutPassReason::kMultilineStretch:
+      return "multiline_stretch";
+    case LayoutPassReason::kFlexLayout:
+      return "flex_layout";
+    case LayoutPassReason::kMeasureChild:
+      return "measure";
+    case LayoutPassReason::kAbsMeasureChild:
+      return "abs_measure";
+    case LayoutPassReason::kFlexMeasure:
+      return "flex_measure";
+    default:
+      return "unknown";
+  }
+}
+
+namespace {
+
+struct Node {
+  std::function<Event::Subscriber> subscriber = nullptr;
+  Node* next = nullptr;
+
+  Node(std::function<Event::Subscriber>&& subscriber)
+      : subscriber{std::move(subscriber)} {}
+};
+
+std::atomic<Node*> subscribers{nullptr};
+
+Node* push(Node* newHead) {
+  Node* oldHead;
+  do {
+    oldHead = subscribers.load(std::memory_order_relaxed);
+    if (newHead != nullptr) {
+      newHead->next = oldHead;
+    }
+  } while (!subscribers.compare_exchange_weak(
+      oldHead, newHead, std::memory_order_release, std::memory_order_relaxed));
+  return oldHead;
+}
+
+} // namespace
+
+void Event::reset() {
+  auto head = push(nullptr);
+  while (head != nullptr) {
+    auto current = head;
+    head = head->next;
+    delete current;
+  }
+}
+
+void Event::subscribe(std::function<Subscriber>&& subscriber) {
+  push(new Node{std::move(subscriber)});
+}
+
+void Event::publish(const YGNode& node, Type eventType, const Data& eventData) {
+  for (auto subscriber = subscribers.load(std::memory_order_relaxed);
+       subscriber != nullptr;
+       subscriber = subscriber->next) {
+    subscriber->subscriber(node, eventType, eventData);
+  }
+}
+
+} // namespace yoga
+} // namespace facebook