Remove ReactScrollView Legacy Background Path (facebook#46168)

Summary:
Pull Request resolved: facebook#46168

## This Diff

This removes the legacy path from ReactScrollView and its view manager.

## This Stack

This removes the non-Style-applicator background management paths of the different native components. There have been multiple conflicting changes, and bugs added bc harder to reason about, which motivates making this change as soon as possible. This also lets us formalize guarantees that BaseViewManager may safely manipulate background styling of all built in native components.

There is one still known issue, where BackgroundStyleApplicator does not propagate I18nManager derived layout direction to borders (compared to Android derived root direction). This is mostly an issue for apps that with LTR and RTL context, or force a layout direction, which I would guess is relatively rare, so my plan is to forward fix this later this by enabling set_android_layout_direction which will solve that problem mopre generically.

Changelog: [Internal]

Reviewed By: tdn120

Differential Revision: D61658081

fbshipit-source-id: d6db43e25faf8e1ebd42d2816c7a915b3ed9404e

Author: NickGerleman

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/views/scroll/ReactScrollView.java

@@ -39,7 +39,6 @@
 import com.facebook.react.bridge.ReactContext;
 import com.facebook.react.bridge.ReadableMap;
 import com.facebook.react.common.ReactConstants;
-import com.facebook.react.internal.featureflags.ReactNativeFeatureFlags;
 import com.facebook.react.uimanager.BackgroundStyleApplicator;
 import com.facebook.react.uimanager.LengthPercentage;
 import com.facebook.react.uimanager.LengthPercentageType;
@@ -50,7 +49,6 @@
 import com.facebook.react.uimanager.ReactClippingViewGroupHelper;
 import com.facebook.react.uimanager.ReactOverflowViewWithInset;
 import com.facebook.react.uimanager.StateWrapper;
-import com.facebook.react.uimanager.ViewProps;
 import com.facebook.react.uimanager.events.NativeGestureUtil;
 import com.facebook.react.uimanager.style.BorderRadiusProp;
 import com.facebook.react.uimanager.style.BorderStyle;
@@ -62,7 +60,6 @@
 import com.facebook.react.views.scroll.ReactScrollViewHelper.HasSmoothScroll;
 import com.facebook.react.views.scroll.ReactScrollViewHelper.HasStateWrapper;
 import com.facebook.react.views.scroll.ReactScrollViewHelper.ReactScrollViewScrollState;
-import com.facebook.react.views.view.ReactViewBackgroundManager;
 import com.facebook.systrace.Systrace;
 import java.lang.reflect.Field;
 import java.util.List;
@@ -119,7 +116,6 @@ public class ReactScrollView extends ScrollView
   private boolean mSnapToEnd = true;
   private int mSnapToAlignment = SNAP_ALIGNMENT_DISABLED;
   private @Nullable View mContentView;
-  private ReactViewBackgroundManager mReactBackgroundManager;
   private @Nullable ReadableMap mCurrentContentOffset = null;
   private int pendingContentOffsetX = UNSET_CONTENT_OFFSET;
   private int pendingContentOffsetY = UNSET_CONTENT_OFFSET;
@@ -140,13 +136,11 @@ public ReactScrollView(Context context) {
   public ReactScrollView(Context context, @Nullable FpsListener fpsListener) {
     super(context);
     mFpsListener = fpsListener;
-    mReactBackgroundManager = new ReactViewBackgroundManager(this);
 
     mScroller = getOverScrollerFromParent();
     setOnHierarchyChangeListener(this);
     setScrollBarStyle(SCROLLBARS_OUTSIDE_OVERLAY);
     setClipChildren(false);
-    mReactBackgroundManager.setOverflow(ViewProps.SCROLL);
 
     ViewCompat.setAccessibilityDelegate(this, new ReactScrollViewAccessibilityDelegate());
   }
@@ -278,7 +272,6 @@ public void setOverflow(@Nullable String overflow) {
       mOverflow = parsedOverflow == null ? Overflow.SCROLL : parsedOverflow;
     }
 
-    mReactBackgroundManager.setOverflow(overflow == null ? ViewProps.SCROLL : overflow);
     invalidate();
   }
 
@@ -684,12 +677,8 @@ public void draw(Canvas canvas) {
 
   @Override
   public void onDraw(Canvas canvas) {
-    if (ReactNativeFeatureFlags.enableBackgroundStyleApplicator()) {
-      if (mOverflow != Overflow.VISIBLE) {
-        BackgroundStyleApplicator.clipToPaddingBox(this, canvas);
-      }
-    } else {
-      mReactBackgroundManager.maybeClipToPaddingBox(canvas);
+    if (mOverflow != Overflow.VISIBLE) {
+      BackgroundStyleApplicator.clipToPaddingBox(this, canvas);
     }
     super.onDraw(canvas);
   }
@@ -1261,55 +1250,35 @@ public void onLayoutChange(
 
   @Override
   public void setBackgroundColor(int color) {
-    if (ReactNativeFeatureFlags.enableBackgroundStyleApplicator()) {
-      BackgroundStyleApplicator.setBackgroundColor(this, color);
-    } else {
-      mReactBackgroundManager.setBackgroundColor(color);
-    }
+    BackgroundStyleApplicator.setBackgroundColor(this, color);
   }
 
   public void setBorderWidth(int position, float width) {
-    if (ReactNativeFeatureFlags.enableBackgroundStyleApplicator()) {
-      BackgroundStyleApplicator.setBorderWidth(
-          this, LogicalEdge.values()[position], PixelUtil.toDIPFromPixel(width));
-    } else {
-      mReactBackgroundManager.setBorderWidth(position, width);
-    }
+    BackgroundStyleApplicator.setBorderWidth(
+        this, LogicalEdge.values()[position], PixelUtil.toDIPFromPixel(width));
   }
 
   public void setBorderColor(int position, @Nullable Integer color) {
-    if (ReactNativeFeatureFlags.enableBackgroundStyleApplicator()) {
-      BackgroundStyleApplicator.setBorderColor(this, LogicalEdge.values()[position], color);
-    } else {
-      mReactBackgroundManager.setBorderColor(position, color);
-    }
+    BackgroundStyleApplicator.setBorderColor(this, LogicalEdge.values()[position], color);
   }
 
   public void setBorderRadius(float borderRadius) {
     setBorderRadius(borderRadius, BorderRadiusProp.BORDER_RADIUS.ordinal());
   }
 
   public void setBorderRadius(float borderRadius, int position) {
-    if (ReactNativeFeatureFlags.enableBackgroundStyleApplicator()) {
-      @Nullable
-      LengthPercentage radius =
-          Float.isNaN(borderRadius)
-              ? null
-              : new LengthPercentage(
-                  PixelUtil.toDIPFromPixel(borderRadius), LengthPercentageType.POINT);
-      BackgroundStyleApplicator.setBorderRadius(this, BorderRadiusProp.values()[position], radius);
-    } else {
-      mReactBackgroundManager.setBorderRadius(borderRadius, position);
-    }
+    @Nullable
+    LengthPercentage radius =
+        Float.isNaN(borderRadius)
+            ? null
+            : new LengthPercentage(
+                PixelUtil.toDIPFromPixel(borderRadius), LengthPercentageType.POINT);
+    BackgroundStyleApplicator.setBorderRadius(this, BorderRadiusProp.values()[position], radius);
   }
 
   public void setBorderStyle(@Nullable String style) {
-    if (ReactNativeFeatureFlags.enableBackgroundStyleApplicator()) {
-      BackgroundStyleApplicator.setBorderStyle(
-          this, style == null ? null : BorderStyle.fromString(style));
-    } else {
-      mReactBackgroundManager.setBorderStyle(style);
-    }
+    BackgroundStyleApplicator.setBorderStyle(
+        this, style == null ? null : BorderStyle.fromString(style));
   }
 
   /**

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/views/scroll/ReactScrollViewManager.java

@@ -17,7 +17,6 @@
 import com.facebook.react.bridge.ReadableMap;
 import com.facebook.react.bridge.RetryableMountingLayerException;
 import com.facebook.react.common.MapBuilder;
-import com.facebook.react.internal.featureflags.ReactNativeFeatureFlags;
 import com.facebook.react.module.annotations.ReactModule;
 import com.facebook.react.uimanager.BackgroundStyleApplicator;
 import com.facebook.react.uimanager.LengthPercentage;
@@ -245,36 +244,20 @@ public void scrollTo(
       },
       defaultFloat = Float.NaN)
   public void setBorderRadius(ReactScrollView view, int index, float borderRadius) {
-    if (ReactNativeFeatureFlags.enableBackgroundStyleApplicator()) {
-      @Nullable
-      LengthPercentage radius =
-          Float.isNaN(borderRadius)
-              ? null
-              : new LengthPercentage(borderRadius, LengthPercentageType.POINT);
-      BackgroundStyleApplicator.setBorderRadius(view, BorderRadiusProp.values()[index], radius);
-    } else {
-      if (!Float.isNaN(borderRadius)) {
-        borderRadius = PixelUtil.toPixelFromDIP(borderRadius);
-      }
-
-      if (index == 0) {
-        view.setBorderRadius(borderRadius);
-      } else {
-        view.setBorderRadius(borderRadius, index - 1);
-      }
-    }
+    @Nullable
+    LengthPercentage radius =
+        Float.isNaN(borderRadius)
+            ? null
+            : new LengthPercentage(borderRadius, LengthPercentageType.POINT);
+    BackgroundStyleApplicator.setBorderRadius(view, BorderRadiusProp.values()[index], radius);
   }
 
   @ReactProp(name = "borderStyle")
   public void setBorderStyle(ReactScrollView view, @Nullable String borderStyle) {
-    if (ReactNativeFeatureFlags.enableBackgroundStyleApplicator()) {
-      @Nullable
-      BorderStyle parsedBorderStyle =
-          borderStyle == null ? null : BorderStyle.fromString(borderStyle);
-      BackgroundStyleApplicator.setBorderStyle(view, parsedBorderStyle);
-    } else {
-      view.setBorderStyle(borderStyle);
-    }
+    @Nullable
+    BorderStyle parsedBorderStyle =
+        borderStyle == null ? null : BorderStyle.fromString(borderStyle);
+    BackgroundStyleApplicator.setBorderStyle(view, parsedBorderStyle);
   }
 
   @ReactPropGroup(
@@ -287,15 +270,7 @@ public void setBorderStyle(ReactScrollView view, @Nullable String borderStyle) {
       },
       defaultFloat = Float.NaN)
   public void setBorderWidth(ReactScrollView view, int index, float width) {
-    if (ReactNativeFeatureFlags.enableBackgroundStyleApplicator()) {
-      BackgroundStyleApplicator.setBorderWidth(view, LogicalEdge.values()[index], width);
-    } else {
-      if (!Float.isNaN(width)) {
-        width = PixelUtil.toPixelFromDIP(width);
-      }
-
-      view.setBorderWidth(SPACING_TYPES[index], width);
-    }
+    BackgroundStyleApplicator.setBorderWidth(view, LogicalEdge.values()[index], width);
   }
 
   @ReactPropGroup(
@@ -308,11 +283,7 @@ public void setBorderWidth(ReactScrollView view, int index, float width) {
       },
       customType = "Color")
   public void setBorderColor(ReactScrollView view, int index, @Nullable Integer color) {
-    if (ReactNativeFeatureFlags.enableBackgroundStyleApplicator()) {
-      BackgroundStyleApplicator.setBorderColor(view, LogicalEdge.ALL, color);
-    } else {
-      view.setBorderColor(SPACING_TYPES[index], color);
-    }
+    BackgroundStyleApplicator.setBorderColor(view, LogicalEdge.ALL, color);
   }
 
   @ReactProp(name = "overflow")
@@ -374,18 +345,12 @@ public void setMaintainVisibleContentPosition(ReactScrollView view, ReadableMap
 
   @ReactProp(name = ViewProps.BOX_SHADOW, customType = "BoxShadow")
   public void setBoxShadow(ReactScrollView view, @Nullable ReadableArray shadows) {
-    if (ReactNativeFeatureFlags.enableBackgroundStyleApplicator()) {
-      BackgroundStyleApplicator.setBoxShadow(view, shadows);
-    }
+    BackgroundStyleApplicator.setBoxShadow(view, shadows);
   }
 
   @Override
   public void setBackgroundColor(ReactScrollView view, @ColorInt int backgroundColor) {
-    if (ReactNativeFeatureFlags.enableBackgroundStyleApplicator()) {
-      BackgroundStyleApplicator.setBackgroundColor(view, backgroundColor);
-    } else {
-      super.setBackgroundColor(view, backgroundColor);
-    }
+    BackgroundStyleApplicator.setBackgroundColor(view, backgroundColor);
   }
 
   @Override