mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Valentin Shergin
24c0702818
Summary: Surprisingly, we have some significant amount of text measuring requests where the string is empty. So, there is no need to go to platform specific layer to find that the size of those strings is zero. Reviewed By: mdvacca Differential Revision: D14297315 fbshipit-source-id: bf84cf27d5c0893262e8b27da8ff42fc77bcd6c5
92 lines
2.6 KiB
C++
92 lines
2.6 KiB
C++
/**
|
|
* Copyright (c) Facebook, Inc. and its affiliates.
|
|
*
|
|
* This source code is licensed under the MIT license found in the
|
|
* LICENSE file in the root directory of this source tree.
|
|
*/
|
|
|
|
#include "ParagraphShadowNode.h"
|
|
#include "ParagraphLocalData.h"
|
|
#include "ParagraphMeasurementCache.h"
|
|
|
|
namespace facebook {
|
|
namespace react {
|
|
|
|
const char ParagraphComponentName[] = "Paragraph";
|
|
|
|
AttributedString ParagraphShadowNode::getAttributedString() const {
|
|
if (!cachedAttributedString_.has_value()) {
|
|
auto textAttributes = TextAttributes::defaultTextAttributes();
|
|
textAttributes.apply(getProps()->textAttributes);
|
|
|
|
cachedAttributedString_ = BaseTextShadowNode::getAttributedString(
|
|
textAttributes, shared_from_this());
|
|
}
|
|
|
|
return cachedAttributedString_.value();
|
|
}
|
|
|
|
void ParagraphShadowNode::setTextLayoutManager(
|
|
SharedTextLayoutManager textLayoutManager) {
|
|
ensureUnsealed();
|
|
textLayoutManager_ = textLayoutManager;
|
|
}
|
|
|
|
void ParagraphShadowNode::setMeasureCache(
|
|
const ParagraphMeasurementCache *cache) {
|
|
ensureUnsealed();
|
|
measureCache_ = cache;
|
|
}
|
|
|
|
void ParagraphShadowNode::updateLocalDataIfNeeded() {
|
|
ensureUnsealed();
|
|
|
|
auto attributedString = getAttributedString();
|
|
auto currentLocalData =
|
|
std::static_pointer_cast<const ParagraphLocalData>(getLocalData());
|
|
if (currentLocalData &&
|
|
currentLocalData->getAttributedString() == attributedString) {
|
|
return;
|
|
}
|
|
|
|
auto localData = std::make_shared<ParagraphLocalData>();
|
|
localData->setAttributedString(std::move(attributedString));
|
|
localData->setTextLayoutManager(textLayoutManager_);
|
|
setLocalData(localData);
|
|
}
|
|
|
|
#pragma mark - LayoutableShadowNode
|
|
|
|
Size ParagraphShadowNode::measure(LayoutConstraints layoutConstraints) const {
|
|
AttributedString attributedString = getAttributedString();
|
|
|
|
if (attributedString.isEmpty()) {
|
|
return {0, 0};
|
|
}
|
|
|
|
const ParagraphAttributes paragraphAttributes =
|
|
getProps()->paragraphAttributes;
|
|
|
|
// Cache results of this function so we don't need to call measure()
|
|
// repeatedly.
|
|
if (measureCache_) {
|
|
return measureCache_->get(
|
|
ParagraphMeasurementCacheKey{attributedString, paragraphAttributes, layoutConstraints},
|
|
[&](const ParagraphMeasurementCacheKey &key) {
|
|
return textLayoutManager_->measure(
|
|
attributedString, paragraphAttributes, layoutConstraints);
|
|
});
|
|
}
|
|
|
|
return textLayoutManager_->measure(
|
|
attributedString, paragraphAttributes, layoutConstraints);
|
|
}
|
|
|
|
void ParagraphShadowNode::layout(LayoutContext layoutContext) {
|
|
updateLocalDataIfNeeded();
|
|
ConcreteViewShadowNode::layout(layoutContext);
|
|
}
|
|
|
|
} // namespace react
|
|
} // namespace facebook
|