mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Valentin Shergin
7186a65b13
Summary: This is another step on the journey of removing `enable_shared_from_this`. It's unclear why we used that before but it's clear now that using shared_ptr here is not necessary because all computation around happens inside the single callstack, so by definition we don't have object life-time concerns here. Changelog: [Internal] Small Fabric-specific optimization. Reviewed By: sammy-SC Differential Revision: D17973957 fbshipit-source-id: 09a65c78e22083ed21b041240307f4858379cc60
93 lines
2.5 KiB
C++
93 lines
2.5 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 "ParagraphMeasurementCache.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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AttributedString ParagraphShadowNode::getAttributedString() const {
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if (!cachedAttributedString_.has_value()) {
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auto textAttributes = TextAttributes::defaultTextAttributes();
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textAttributes.apply(getProps()->textAttributes);
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cachedAttributedString_ =
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BaseTextShadowNode::getAttributedString(textAttributes, *this);
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}
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return cachedAttributedString_.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::setMeasureCache(
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ParagraphMeasurementCache const *cache) {
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ensureUnsealed();
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measureCache_ = cache;
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}
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void ParagraphShadowNode::updateStateIfNeeded() {
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ensureUnsealed();
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auto attributedString = getAttributedString();
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auto const &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 == attributedString &&
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state.layoutManager == textLayoutManager_) {
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return;
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}
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setStateData(ParagraphState{attributedString, 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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AttributedString attributedString = getAttributedString();
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if (attributedString.isEmpty()) {
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return {0, 0};
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}
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ParagraphAttributes const paragraphAttributes =
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getProps()->paragraphAttributes;
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assert(measureCache_);
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return measureCache_->get(
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ParagraphMeasurementCacheKey{
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attributedString, paragraphAttributes, layoutConstraints},
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[&](ParagraphMeasurementCacheKey const &key) {
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return textLayoutManager_->measure(
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attributedString, paragraphAttributes, layoutConstraints);
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});
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return textLayoutManager_->measure(
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attributedString, paragraphAttributes, layoutConstraints);
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}
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void ParagraphShadowNode::layout(LayoutContext layoutContext) {
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updateStateIfNeeded();
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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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