Fabric: Making `fabric/textlayoutmanager` compilable on Android

Summary:
@public
This compiles, but it works only on iOS for now.

Reviewed By: mdvacca

Differential Revision: D8655540

fbshipit-source-id: 7e9a73fadb317dd62298af6f347344ac4229a8a5

ReactCommon/fabric/textlayoutmanager/BUCK

@@ -13,14 +13,14 @@ rn_xplat_cxx_library(
     name = "textlayoutmanager",
     srcs = glob(
         [
-            "**/*.cpp",
-            "**/*.mm",
+            "*.cpp",
         ],
-        exclude = glob(["tests/**/*.cpp"]),
     ),
-    headers = glob(
-        ["**/*.h"],
-        exclude = glob(["tests/**/*.h"]),
+    headers = subdir_glob(
+        [
+            ("", "*.h"),
+        ],
+        prefix = "",
     ),
     header_namespace = "",
     exported_headers = subdir_glob(
@@ -35,6 +35,24 @@ rn_xplat_cxx_library(
         "-std=c++14",
         "-Wall",
     ],
+    fbandroid_exported_headers = subdir_glob(
+        [
+            ("", "*.h"),
+            ("platform/android", "*.h"),
+        ],
+        prefix = "fabric/textlayoutmanager",
+    ),
+    fbandroid_headers = subdir_glob(
+        [
+            ("platform/android", "**/*.h"),
+        ],
+        prefix = "",
+    ),
+    fbandroid_srcs = glob(
+        [
+            "platform/android/**/*.cpp",
+        ],
+    ),
     fbobjc_compiler_flags = APPLE_COMPILER_FLAGS,
     fbobjc_preprocessor_flags = get_debug_preprocessor_flags() + get_apple_inspector_flags(),
     fbobjc_tests = [
@@ -46,6 +64,26 @@ rn_xplat_cxx_library(
         "$SDKROOT/System/Library/Frameworks/Foundation.framework",
         "$SDKROOT/System/Library/Frameworks/UIKit.framework",
     ],
+    ios_deps = [
+    ],
+    ios_exported_headers = subdir_glob(
+        [
+            ("platform/ios", "*.h"),
+        ],
+        prefix = "fabric/textlayoutmanager",
+    ),
+    ios_headers = subdir_glob(
+        [
+            ("platform/ios", "**/*.h"),
+        ],
+        prefix = "",
+    ),
+    ios_srcs = glob(
+        [
+            "platform/ios/**/*.cpp",
+            "platform/ios/**/*.mm",
+        ],
+    ),
     macosx_tests_override = [],
     platforms = (ANDROID, APPLE),
     preprocessor_flags = [

ReactCommon/fabric/textlayoutmanager/platform/android/TextLayoutManager.cpp

@@ -0,0 +1,33 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ *
+ * 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"
+
+namespace facebook {
+namespace react {
+
+TextLayoutManager::TextLayoutManager() {
+}
+
+TextLayoutManager::~TextLayoutManager() {
+}
+
+void *TextLayoutManager::getNativeTextLayoutManager() const {
+  return self_;
+}
+
+Size TextLayoutManager::measure(
+  AttributedString attributedString,
+  ParagraphAttributes paragraphAttributes,
+  LayoutConstraints layoutConstraints
+) const {
+  // Not implemented.
+  return {};
+}
+
+} // namespace react
+} // namespace facebook

ReactCommon/fabric/textlayoutmanager/platform/android/TextLayoutManager.h

@@ -0,0 +1,54 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#pragma once
+
+#include <memory>
+
+#include <fabric/attributedstring/AttributedString.h>
+#include <fabric/attributedstring/ParagraphAttributes.h>
+#include <fabric/core/LayoutConstraints.h>
+
+namespace facebook {
+namespace react {
+
+class TextLayoutManager;
+
+using SharedTextLayoutManager = std::shared_ptr<const TextLayoutManager>;
+
+/*
+ * Cross platform facade for Android-specific TextLayoutManager.
+ */
+class TextLayoutManager {
+
+public:
+
+  TextLayoutManager();
+  ~TextLayoutManager();
+
+  /*
+   * Measures `attributedString` using native text rendering infrastructure.
+   */
+  Size measure(
+    AttributedString attributedString,
+    ParagraphAttributes paragraphAttributes,
+    LayoutConstraints layoutConstraints
+  ) const;
+
+  /*
+   * Returns an opaque pointer to platform-specific TextLayoutManager.
+   * Is used on a native views layer to delegate text rendering to the manager.
+   */
+  void *getNativeTextLayoutManager() const;
+
+private:
+  
+  void *self_;
+};
+
+} // namespace react
+} // namespace facebook