mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Valentin Shergin
3c464782e0
Differential Revision: D15410979 Original commit changeset: 3c9517d2495a fbshipit-source-id: 2e2fc860dd657b2b2159bd245896a4e8a25d5734
72 lines
2.4 KiB
C++
72 lines
2.4 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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#pragma once
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#include "ParagraphMeasurementCache.h"
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#include "ParagraphShadowNode.h"
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#include <folly/container/EvictingCacheMap.h>
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#include <react/config/ReactNativeConfig.h>
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#include <react/core/ConcreteComponentDescriptor.h>
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#include <react/textlayoutmanager/TextLayoutManager.h>
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#include <react/utils/ContextContainer.h>
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namespace facebook {
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namespace react {
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/*
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* Descriptor for <Paragraph> component.
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*/
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class ParagraphComponentDescriptor final
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: public ConcreteComponentDescriptor<ParagraphShadowNode> {
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public:
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ParagraphComponentDescriptor(
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EventDispatcher::Shared eventDispatcher,
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ContextContainer::Shared const &contextContainer)
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: ConcreteComponentDescriptor<ParagraphShadowNode>(eventDispatcher) {
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// Every single `ParagraphShadowNode` will have a reference to
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// a shared `TextLayoutManager`.
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textLayoutManager_ = std::make_shared<TextLayoutManager>(contextContainer);
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// Every single `ParagraphShadowNode` will have a reference to
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// a shared `EvictingCacheMap`, a simple LRU cache for Paragraph
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// measurements.
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measureCache_ = std::make_unique<ParagraphMeasurementCache>();
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}
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protected:
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void adopt(UnsharedShadowNode shadowNode) const override {
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ConcreteComponentDescriptor::adopt(shadowNode);
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assert(std::dynamic_pointer_cast<ParagraphShadowNode>(shadowNode));
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auto paragraphShadowNode =
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std::static_pointer_cast<ParagraphShadowNode>(shadowNode);
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// `ParagraphShadowNode` uses `TextLayoutManager` to measure text content
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// and communicate text rendering metrics to mounting layer.
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paragraphShadowNode->setTextLayoutManager(textLayoutManager_);
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// `ParagraphShadowNode` uses this to cache the results of text rendering
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// measurements.
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paragraphShadowNode->setMeasureCache(
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measureCache_ ? measureCache_.get() : nullptr);
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paragraphShadowNode->dirtyLayout();
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// All `ParagraphShadowNode`s must have leaf Yoga nodes with properly
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// setup measure function.
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paragraphShadowNode->enableMeasurement();
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}
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private:
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SharedTextLayoutManager textLayoutManager_;
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std::unique_ptr<const ParagraphMeasurementCache> measureCache_;
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};
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} // namespace react
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} // namespace facebook
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