mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Valentin Shergin
06ce568155
Summary: All props to Eric Lewis! cc ericlewis This revert of revert of land of changes originally published in #24873 (with some slight fixes). The change removes usage of LocalData from the `<Text>` component. After this change we only have ---one (maybe two)--- three components left using LocalData. Reviewed By: mdvacca Differential Revision: D15962376 fbshipit-source-id: 19f41109ce9d71ce30d618a45eb2b547a11f29a2
87 lines
2.7 KiB
C++
87 lines
2.7 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 <folly/Optional.h>
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#include <react/components/text/ParagraphMeasurementCache.h>
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#include <react/components/text/ParagraphProps.h>
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#include <react/components/text/ParagraphState.h>
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#include <react/components/text/TextShadowNode.h>
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#include <react/components/view/ConcreteViewShadowNode.h>
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#include <react/core/ConcreteShadowNode.h>
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#include <react/core/LayoutContext.h>
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#include <react/core/ShadowNode.h>
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#include <react/textlayoutmanager/TextLayoutManager.h>
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namespace facebook {
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namespace react {
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extern char const ParagraphComponentName[];
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using ParagraphEventEmitter = ViewEventEmitter;
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/*
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* `ShadowNode` for <Paragraph> component, represents <View>-like component
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* containing and displaying text. Text content is represented as nested <Text>
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* and <RawText> components.
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*/
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class ParagraphShadowNode : public ConcreteViewShadowNode<
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ParagraphComponentName,
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ParagraphProps,
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ParagraphEventEmitter,
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ParagraphState>,
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public BaseTextShadowNode {
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public:
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using ConcreteViewShadowNode::ConcreteViewShadowNode;
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/*
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* Returns a `AttributedString` which represents text content of the node.
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*/
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AttributedString getAttributedString() const;
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/*
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* Associates a shared TextLayoutManager with the node.
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* `ParagraphShadowNode` uses the manager to measure text content
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* and construct `ParagraphState` objects.
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*/
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void setTextLayoutManager(SharedTextLayoutManager textLayoutManager);
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/*
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* Associates a shared LRU cache with the node.
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* `ParagraphShadowNode` uses this to cache the results of
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* text rendering measurements.
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* By design, the ParagraphComponentDescriptor outlives all
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* shadow nodes, so it's safe for this to be a raw pointer.
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*/
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void setMeasureCache(ParagraphMeasurementCache const *cache);
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#pragma mark - LayoutableShadowNode
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void layout(LayoutContext layoutContext) override;
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Size measure(LayoutConstraints layoutConstraints) const override;
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private:
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/*
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* Creates a `State` object (with `AttributedText` and
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* `TextLayoutManager`) if needed.
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*/
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void updateStateIfNeeded();
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SharedTextLayoutManager textLayoutManager_;
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ParagraphMeasurementCache const *measureCache_;
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/*
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* Cached attributed string that represents the content of the subtree started
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* from the node.
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*/
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mutable folly::Optional<AttributedString> cachedAttributedString_{};
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};
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} // namespace react
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} // namespace facebook
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