Create UIManager interface and extract common classes in uimanager/common

Reviewed By: achen1

Differential Revision: D7102674

fbshipit-source-id: e14b6782ad102ec1c3d37988df4bbd4190511f09

ReactAndroid/src/main/java/com/facebook/react/uimanager/common/BUCK

@@ -0,0 +1,12 @@
+load("//ReactNative:DEFS.bzl", "rn_android_library", "react_native_dep", "react_native_target")
+
+rn_android_library(
+    name = "common",
+    srcs = glob(["*.java"]),
+    visibility = [
+        "PUBLIC",
+    ],
+    deps = [
+        react_native_dep("third-party/java/jsr-305:jsr-305"),
+    ],
+)

ReactAndroid/src/main/java/com/facebook/react/uimanager/common/MeasureSpecProvider.java

@@ -0,0 +1,17 @@
+// Copyright 2004-present Facebook. All Rights Reserved.
+
+package com.facebook.react.uimanager.common;
+
+import android.view.View;
+
+/**
+ * Interface for a {@link View} subclass that provides the width and height measure specs from its
+ * measure pass. This is currently used to re-measure the root view by reusing the specs for yoga
+ * layout calculations.
+ */
+public interface MeasureSpecProvider {
+
+  int getWidthMeasureSpec();
+
+  int getHeightMeasureSpec();
+}

ReactAndroid/src/main/java/com/facebook/react/uimanager/common/SizeMonitoringFrameLayout.java

@@ -0,0 +1,53 @@
+/**
+ * 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.
+ */
+
+package com.facebook.react.uimanager.common;
+
+import javax.annotation.Nullable;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.widget.FrameLayout;
+
+/**
+ * Subclass of {@link FrameLayout} that allows registering for size change events. The main purpose
+ * for this class is to hide complexity of {@link ReactRootView} from the code under
+ * {@link com.facebook.react.uimanager} package.
+ */
+public class SizeMonitoringFrameLayout extends FrameLayout {
+
+  public static interface OnSizeChangedListener {
+    void onSizeChanged(int width, int height, int oldWidth, int oldHeight);
+  }
+
+  private @Nullable OnSizeChangedListener mOnSizeChangedListener;
+
+  public SizeMonitoringFrameLayout(Context context) {
+    super(context);
+  }
+
+  public SizeMonitoringFrameLayout(Context context, AttributeSet attrs) {
+    super(context, attrs);
+  }
+
+  public SizeMonitoringFrameLayout(Context context, AttributeSet attrs, int defStyle) {
+    super(context, attrs, defStyle);
+  }
+
+  public void setOnSizeChangedListener(OnSizeChangedListener onSizeChangedListener) {
+    mOnSizeChangedListener = onSizeChangedListener;
+  }
+
+  @Override
+  protected void onSizeChanged(int w, int h, int oldw, int oldh) {
+    super.onSizeChanged(w, h, oldw, oldh);
+
+    if (mOnSizeChangedListener != null) {
+      mOnSizeChangedListener.onSizeChanged(w, h, oldw, oldh);
+    }
+  }
+}