mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Valentin Shergin
c4876d0313
Summary: The diff implements a new class called `AttributedStringBox` that represents an object storing a shared `AttributedString` *or* a shared pointer to some opaque platform-specific object that can be used as an attributed string. The class serves two main purposes: - Represent type-erased attributed string entity (which can be platform-specific or platform-independent); - Represent a container that can be copied with constant complexity. Why? Several reasons: - Sometimes it makes sense to keep an attributed string as a shared resource. This way we don't need to pay for expensive copying and we also implement a copy-on-write semantics on top of that if needed. - We need to extend a TextLayoutMeasure API to support measuring some platform-specific attributed string implementation to remove the necessity of converting a string back and forth between representations. That's especially important for TextInput because we will need to measure that very efficiently (and the source of measuring, in this case, is a platform attributed string). In other words, we need something to store inside TextInputState to measure and update very efficiently. The source of this data might be a native TextInput control or a data from React, to represent that kinda object we need this data structure (and interfaces that deal with it). Changelog: [Internal] Fabric-specific internal change. Reviewed By: sammy-SC Differential Revision: D18670793 fbshipit-source-id: bc0164f801f28642f7c6da340af12acf33b85d24
85 lines
2.7 KiB
C++
85 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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#include "TextLayoutManager.h"
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#include <react/attributedstring/conversions.h>
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#include <react/core/conversions.h>
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#include <react/jni/ReadableNativeMap.h>
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using namespace facebook::jni;
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namespace facebook {
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namespace react {
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TextLayoutManager::~TextLayoutManager() {}
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void *TextLayoutManager::getNativeTextLayoutManager() const {
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return self_;
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}
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Size TextLayoutManager::measure(
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AttributedStringBox attributedStringBox,
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ParagraphAttributes paragraphAttributes,
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LayoutConstraints layoutConstraints) const {
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auto &attributedString = attributedStringBox.getValue();
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return measureCache_.get(
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MeasureCacheKey{attributedString, paragraphAttributes, layoutConstraints},
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[&](MeasureCacheKey const &key) {
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return doMeasure(
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attributedString, paragraphAttributes, layoutConstraints);
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});
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}
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Size TextLayoutManager::doMeasure(
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AttributedString attributedString,
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ParagraphAttributes paragraphAttributes,
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LayoutConstraints layoutConstraints) const {
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const jni::global_ref<jobject> &fabricUIManager =
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contextContainer_->at<jni::global_ref<jobject>>("FabricUIManager");
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static auto measure =
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jni::findClassStatic("com/facebook/react/fabric/FabricUIManager")
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->getMethod<jlong(
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jstring,
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ReadableMap::javaobject,
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ReadableMap::javaobject,
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ReadableMap::javaobject,
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jfloat,
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jfloat,
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jfloat,
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jfloat)>("measure");
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auto minimumSize = layoutConstraints.minimumSize;
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auto maximumSize = layoutConstraints.maximumSize;
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local_ref<JString> componentName = make_jstring("RCTText");
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local_ref<ReadableNativeMap::javaobject> attributedStringRNM =
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ReadableNativeMap::newObjectCxxArgs(toDynamic(attributedString));
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local_ref<ReadableNativeMap::javaobject> paragraphAttributesRNM =
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ReadableNativeMap::newObjectCxxArgs(toDynamic(paragraphAttributes));
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local_ref<ReadableMap::javaobject> attributedStringRM = make_local(
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reinterpret_cast<ReadableMap::javaobject>(attributedStringRNM.get()));
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local_ref<ReadableMap::javaobject> paragraphAttributesRM = make_local(
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reinterpret_cast<ReadableMap::javaobject>(paragraphAttributesRNM.get()));
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return yogaMeassureToSize(measure(
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fabricUIManager,
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componentName.get(),
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attributedStringRM.get(),
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paragraphAttributesRM.get(),
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nullptr,
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minimumSize.width,
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maximumSize.width,
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minimumSize.height,
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maximumSize.height));
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}
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} // namespace react
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} // namespace facebook
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