mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Samuel Susla
e97e3499c3
Summary: Changelog: [internal] To avoid unnecessary string copy in event pipeline, use move semantics. Event pipeline has ownership of event type. Passing it by reference ends up in a copy when `RawEvent` object is constructed. To avoid this, pass string by value through each layer and use move semantics to avoid extra copies. Reviewed By: javache Differential Revision: D34392608 fbshipit-source-id: c11d221be345665e165d9edbc360ba5a057e3890
48 lines
1.3 KiB
C++
48 lines
1.3 KiB
C++
/*
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* Copyright (c) Meta Platforms, Inc. and 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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#pragma once
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#include <memory>
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#include <folly/dynamic.h>
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#include <react/renderer/components/view/ViewEventEmitter.h>
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#include <react/renderer/core/EventEmitter.h>
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#include <react/renderer/graphics/Geometry.h>
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namespace facebook {
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namespace react {
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class ScrollViewMetrics {
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public:
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Size contentSize;
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Point contentOffset;
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EdgeInsets contentInset;
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Size containerSize;
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Float zoomScale;
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};
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class ScrollViewEventEmitter : public ViewEventEmitter {
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public:
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using ViewEventEmitter::ViewEventEmitter;
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void onScroll(const ScrollViewMetrics &scrollViewMetrics) const;
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void onScrollBeginDrag(const ScrollViewMetrics &scrollViewMetrics) const;
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void onScrollEndDrag(const ScrollViewMetrics &scrollViewMetrics) const;
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void onMomentumScrollBegin(const ScrollViewMetrics &scrollViewMetrics) const;
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void onMomentumScrollEnd(const ScrollViewMetrics &scrollViewMetrics) const;
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private:
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void dispatchScrollViewEvent(
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std::string name,
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const ScrollViewMetrics &scrollViewMetrics,
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EventPriority priority = EventPriority::AsynchronousBatched) const;
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};
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} // namespace react
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} // namespace facebook
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