react-native/ReactCommon/fabric/textlayoutmanager/platform/android/TextLayoutManager.cpp

/**
 * 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 "TextLayoutManager.h"

#include <fabric/attributedstring/conversions.h>
#include <react/jni/ReadableNativeMap.h>

using namespace facebook::jni;

namespace facebook {
namespace react {

TextLayoutManager::~TextLayoutManager() {
}

void *TextLayoutManager::getNativeTextLayoutManager() const {
  return self_;
}

Size TextLayoutManager::measure(
  Tag reactTag,
  AttributedString attributedString,
  ParagraphAttributes paragraphAttributes,
  LayoutConstraints layoutConstraints
) const {

  const jni::global_ref<jobject> & fabricUIManager = contextContainer_->getInstance<jni::global_ref<jobject>>("FabricUIManager");

  auto clazz = jni::findClassStatic("com/facebook/fbreact/fabric/UIManager");
  static auto measure =
      clazz->getMethod<JArrayFloat::javaobject(jint, jstring, ReadableNativeMap::javaobject, ReadableNativeMap::javaobject, jint, jint)>("measure");

  int width = (int) layoutConstraints.maximumSize.width;
  int height = (int) layoutConstraints.maximumSize.height;
  local_ref<JString> componentName = make_jstring("RCTText");
  auto values = measure(fabricUIManager, reactTag, componentName.get(), ReadableNativeMap::newObjectCxxArgs(toDynamic(attributedString)).get(), ReadableNativeMap::newObjectCxxArgs(toDynamic(paragraphAttributes)).get(), width, height);

  std::vector<float> indices;
  indices.resize(values->size());
  values->getRegion(0, values->size(), indices.data());

  return {(float) indices[0], (float) indices[1]};
}

} // namespace react
} // namespace facebook