87 lines
2.1 KiB
C++
87 lines
2.1 KiB
C++
/*
|
|
* 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
|