mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Valentin Shergin
d1ad29b7db
Summary: `ParagraphShadowNode::Content` describes all nested content of a `Paragraph` component as a single entity allowing to reason about that as a thing that holds an invariant. Now we can store that as a single thing, copy, pass to functions, build on top of that and etc. Changelog: [Internal] Fabric-specific internal change. Reviewed By: sammy-SC, mdvacca Differential Revision: D20268043 fbshipit-source-id: e976588ad76615259c72bc21f9ad8d923f2f3b9f
86 lines
2.3 KiB
C++
86 lines
2.3 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 "ParagraphShadowNode.h"
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#include <react/attributedstring/AttributedStringBox.h>
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#include "ParagraphState.h"
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namespace facebook {
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namespace react {
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char const ParagraphComponentName[] = "Paragraph";
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ParagraphShadowNode::Content const &ParagraphShadowNode::getContent() const {
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if (content_.has_value()) {
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return content_.value();
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}
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ensureUnsealed();
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auto textAttributes = TextAttributes::defaultTextAttributes();
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textAttributes.apply(getConcreteProps().textAttributes);
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auto attributedString = AttributedString{};
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auto attachments = Attachments{};
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buildAttributedString(textAttributes, *this, attributedString, attachments);
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content_ = Content{
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attributedString, getConcreteProps().paragraphAttributes, attachments};
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return content_.value();
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}
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void ParagraphShadowNode::setTextLayoutManager(
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SharedTextLayoutManager textLayoutManager) {
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ensureUnsealed();
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textLayoutManager_ = textLayoutManager;
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}
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void ParagraphShadowNode::updateStateIfNeeded(Content const &content) {
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ensureUnsealed();
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auto &state = getStateData();
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assert(textLayoutManager_);
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assert(
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(!state.layoutManager || state.layoutManager == textLayoutManager_) &&
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"`StateData` refers to a different `TextLayoutManager`");
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if (state.attributedString == content.attributedString &&
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state.layoutManager == textLayoutManager_) {
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return;
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}
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setStateData(ParagraphState{content.attributedString,
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content.paragraphAttributes,
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textLayoutManager_});
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}
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#pragma mark - LayoutableShadowNode
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Size ParagraphShadowNode::measure(LayoutConstraints layoutConstraints) const {
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auto content = getContent();
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if (content.attributedString.isEmpty()) {
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return layoutConstraints.clamp({0, 0});
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}
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return textLayoutManager_->measure(
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AttributedStringBox{content.attributedString},
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content.paragraphAttributes,
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layoutConstraints);
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}
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void ParagraphShadowNode::layout(LayoutContext layoutContext) {
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updateStateIfNeeded(getContent());
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ConcreteViewShadowNode::layout(layoutContext);
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}
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} // namespace react
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} // namespace facebook
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