mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Joshua Gross
6be37d8c0a
Summary: Of course, compare_exchange_strong didn't actually do what I wanted. Using a mutex is simpler and actually has the semantics we want: atomically get the current value, compare, and bail if the value is the same, or swap and continue. Changelog: [Internal] Reviewed By: shergin Differential Revision: D19754451 fbshipit-source-id: 6b0aef217b235959af683ec5e31b07a0dd7bb040
63 lines
1.8 KiB
C++
63 lines
1.8 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#include "ViewEventEmitter.h"
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namespace facebook {
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namespace react {
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#pragma mark - Accessibility
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void ViewEventEmitter::onAccessibilityAction(const std::string &name) const {
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dispatchEvent("accessibilityAction", [name](jsi::Runtime &runtime) {
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auto payload = jsi::Object(runtime);
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payload.setProperty(runtime, "action", name);
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return payload;
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});
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}
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void ViewEventEmitter::onAccessibilityTap() const {
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dispatchEvent("accessibilityTap");
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}
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void ViewEventEmitter::onAccessibilityMagicTap() const {
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dispatchEvent("magicTap");
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}
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void ViewEventEmitter::onAccessibilityEscape() const {
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dispatchEvent("accessibilityEscape");
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}
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#pragma mark - Layout
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void ViewEventEmitter::onLayout(const LayoutMetrics &layoutMetrics) const {
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// Due to State Reconciliation, `onLayout` can be called potentially many
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// times with identical layoutMetrics. Ensure that the JS event is only
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// dispatched when the value changes.
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{
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std::lock_guard<std::mutex> guard(layoutMetricsMutex_);
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if (lastLayoutMetrics_ == layoutMetrics) {
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return;
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}
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lastLayoutMetrics_ = layoutMetrics;
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}
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dispatchEvent("layout", [frame = layoutMetrics.frame](jsi::Runtime &runtime) {
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auto layout = jsi::Object(runtime);
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layout.setProperty(runtime, "x", frame.origin.x);
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layout.setProperty(runtime, "y", frame.origin.y);
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layout.setProperty(runtime, "width", frame.size.width);
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layout.setProperty(runtime, "height", frame.size.height);
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auto payload = jsi::Object(runtime);
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payload.setProperty(runtime, "layout", std::move(layout));
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return payload;
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});
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}
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} // namespace react
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} // namespace facebook
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