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David VaccaandFacebook GitHub Bot
4b596fd5b3
Summary: This diff extends the measurement of Text components in order to support empty strings. This is required for parity with Paper. I created a follow up task to analyze support of empty string as part of the Text infrastructure of Fabric in the future. changelog: [Internal] Reviewed By: sammy-SC Differential Revision: D21761171 fbshipit-source-id: d2aa074052b09732af5d35723f19014090fcabbf
71 lines
2.0 KiB
C++
71 lines
2.0 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 <react/attributedstring/AttributedString.h>
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#include <react/attributedstring/TextAttributes.h>
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namespace facebook {
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namespace react {
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/*
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* Base class (one of) for shadow nodes that represents attributed text,
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* such as Text and Paragraph (but not RawText).
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*/
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class BaseTextShadowNode {
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public:
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/*
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* Represents additional information associated with some fragments which
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* represent embedded into text component (such as an image or inline view).
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*/
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class Attachment final {
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public:
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/*
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* Unowning pointer to a `ShadowNode` that represents the attachment.
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* Cannot be `null`.
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*/
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ShadowNode const *shadowNode;
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/*
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* Index of the fragment in `AttributedString` that represents the
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* the attachment.
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*/
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size_t fragmentIndex;
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};
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/*
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* A list of `Attachment`s.
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* Performance-wise, the prevailing case is when there are no attachments
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* at all, therefore we don't need an inline buffer (`small_vector`).
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*/
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using Attachments = std::vector<Attachment>;
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/*
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* Builds an `AttributedString` which represents text content of the node.
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* This is static so that both Paragraph (which subclasses BaseText) and
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* TextInput (which does not) can use this.
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* TODO T53299884: decide if this should be moved out and made a static
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* function, or if TextInput should inherit from BaseTextShadowNode.
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*/
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static void buildAttributedString(
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TextAttributes const &baseTextAttributes,
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ShadowNode const &parentNode,
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AttributedString &outAttributedString,
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Attachments &outAttachments);
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/**
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* Returns a character used to measure empty strings in native platforms.
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*/
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inline static std::string getEmptyPlaceholder() {
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return "I";
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}
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};
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} // namespace react
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} // namespace facebook
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