feat: flex gap bindings (#34974)

Summary:
This PR adds React native binding for https://github.com/facebook/yoga/pull/1116

## Changelog

[General] [Added] - Flex gap yoga bindings

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Pull Request resolved: https://github.com/facebook/react-native/pull/34974

Test Plan:
Run rn tester app and go to view example. You'll find a flex gap example. Example location - `packages/rn-tester/js/examples/View/ViewExample.js`

### Tested on
- [x] iOS Fabric
- [x] iOS non-fabric
- [x] Android Fabric
- [x] Android non-fabric

To test on non-fabric Android, I just switched these booleans. Let me know if there's anything else I might have missed.

<img width="674" alt="Screenshot 2022-10-14 at 3 30 48 AM" src="https://user-images.githubusercontent.com/23293248/195718971-7aee4e7e-dbf0-4452-9d47-7925919c61dc.png">

Reviewed By: mdvacca

Differential Revision: D40527474

Pulled By: NickGerleman

fbshipit-source-id: 81c2c97c76f58fad3bb40fb378aaf8b6ebd30d63

Libraries/Components/View/ReactNativeStyleAttributes.js

@@ -32,6 +32,7 @@ const ReactNativeStyleAttributes: {[string]: AnyAttributeType, ...} = {
   borderRightWidth: true,
   borderStartWidth: true,
   borderTopWidth: true,
+  columnGap: true,
   borderWidth: true,
   bottom: true,
   direction: true,
@@ -43,6 +44,7 @@ const ReactNativeStyleAttributes: {[string]: AnyAttributeType, ...} = {
   flexGrow: true,
   flexShrink: true,
   flexWrap: true,
+  gap: true,
   height: true,
   justifyContent: true,
   left: true,
@@ -71,6 +73,7 @@ const ReactNativeStyleAttributes: {[string]: AnyAttributeType, ...} = {
   paddingVertical: true,
   position: true,
   right: true,
+  rowGap: true,
   start: true,
   top: true,
   width: true,

Libraries/NativeComponent/BaseViewConfig.android.js

@@ -196,6 +196,9 @@ const validAttributesForNonEventProps = {
   maxHeight: true,
   flex: true,
   flexGrow: true,
+  rowGap: true,
+  columnGap: true,
+  gap: true,
   flexShrink: true,
   flexBasis: true,
   aspectRatio: true,

Libraries/NativeComponent/BaseViewConfig.ios.js

@@ -271,6 +271,9 @@ const validAttributesForNonEventProps = {
 
   flex: true,
   flexGrow: true,
+  rowGap: true,
+  columnGap: true,
+  gap: true,
   flexShrink: true,
   flexBasis: true,
   flexDirection: true,

Libraries/StyleSheet/StyleSheetTypes.d.ts

@@ -52,6 +52,9 @@ export interface FlexStyle {
     | 'row-reverse'
     | 'column-reverse'
     | undefined;
+  rowGap?: number | undefined;
+  gap?: number | undefined;
+  columnGap?: number | undefined;
   flexGrow?: number | undefined;
   flexShrink?: number | undefined;
   flexWrap?: 'wrap' | 'nowrap' | 'wrap-reverse' | undefined;

Libraries/StyleSheet/StyleSheetTypes.js

@@ -518,6 +518,19 @@ export type ____ShadowStyle_InternalCore = $ReadOnly<{
    * @platform ios
    */
   shadowRadius?: number,
+
+  /**
+   * In React Native, gap works the same way it does in CSS.
+   * If there are two or more children in a container, they will be separated from each other
+   * by the value of the gap - but the children will not be separated from the edges of their parent container.
+   * For horizontal gaps, use columnGap, for vertical gaps, use rowGap, and to apply both at the same time, it's gap.
+   * When align-content or justify-content are set to space-between or space-around, the separation
+   * between children may be larger than the gap value.
+   * See https://developer.mozilla.org/en-US/docs/Web/CSS/gap for more details.
+   */
+  rowGap?: number,
+  columnGap?: number,
+  gap?: number,
 }>;
 
 export type ____ShadowStyle_Internal = $ReadOnly<{

Libraries/StyleSheet/splitLayoutProps.js

@@ -49,6 +49,9 @@ export default function splitLayoutProps(props: ?____ViewStyle_Internal): {
         case 'bottom':
         case 'top':
         case 'transform':
+        case 'rowGap':
+        case 'columnGap':
+        case 'gap':
           // $FlowFixMe[cannot-write]
           // $FlowFixMe[incompatible-use]
           // $FlowFixMe[prop-missing]

React/Views/RCTShadowView.h

@@ -152,6 +152,9 @@ typedef void (^RCTApplierBlock)(NSDictionary<NSNumber *, UIView *> *viewRegistry
 
 @property (nonatomic, assign) float flex;
 @property (nonatomic, assign) float flexGrow;
+@property (nonatomic, assign) float rowGap;
+@property (nonatomic, assign) float columnGap;
+@property (nonatomic, assign) float gap;
 @property (nonatomic, assign) float flexShrink;
 @property (nonatomic, assign) YGValue flexBasis;
 

React/Views/RCTShadowView.m

@@ -642,6 +642,20 @@ RCTShadowViewMeasure(YGNodeRef node, float width, YGMeasureMode widthMode, float
   return YGNodeStyleGetFlexBasis(_yogaNode);
 }
 
+#define RCT_GAP_PROPERTY(setProp, getProp, cssProp, type, gap) \
+  -(void)set##setProp : (type)value                            \
+  {                                                            \
+    YGNodeStyleSet##cssProp(_yogaNode, gap, value);            \
+  }                                                            \
+  -(type)getProp                                               \
+  {                                                            \
+    return YGNodeStyleGet##cssProp(_yogaNode, gap);            \
+  }
+
+RCT_GAP_PROPERTY(RowGap, rowGap, Gap, float, YGGutterRow);
+RCT_GAP_PROPERTY(ColumnGap, columnGap, Gap, float, YGGutterColumn);
+RCT_GAP_PROPERTY(Gap, gap, Gap, float, YGGutterAll);
+
 #define RCT_STYLE_PROPERTY(setProp, getProp, cssProp, type) \
   -(void)set##setProp : (type)value                         \
   {                                                         \

React/Views/RCTViewManager.m

@@ -426,6 +426,9 @@ RCT_EXPORT_SHADOW_PROPERTY(alignSelf, YGAlign)
 RCT_EXPORT_SHADOW_PROPERTY(alignContent, YGAlign)
 RCT_EXPORT_SHADOW_PROPERTY(position, YGPositionType)
 RCT_EXPORT_SHADOW_PROPERTY(aspectRatio, float)
+RCT_EXPORT_SHADOW_PROPERTY(rowGap, float)
+RCT_EXPORT_SHADOW_PROPERTY(columnGap, float)
+RCT_EXPORT_SHADOW_PROPERTY(gap, float)
 
 RCT_EXPORT_SHADOW_PROPERTY(overflow, YGOverflow)
 RCT_EXPORT_SHADOW_PROPERTY(display, YGDisplay)

ReactAndroid/src/main/java/com/facebook/react/uimanager/LayoutShadowNode.java

@@ -224,6 +224,30 @@ public class LayoutShadowNode extends ReactShadowNodeImpl {
     super.setFlexGrow(flexGrow);
   }
 
+  @ReactProp(name = ViewProps.ROW_GAP, defaultFloat = YogaConstants.UNDEFINED)
+  public void setRowGap(float rowGap) {
+    if (isVirtual()) {
+      return;
+    }
+    super.setRowGap(PixelUtil.toPixelFromDIP(rowGap));
+  }
+
+  @ReactProp(name = ViewProps.COLUMN_GAP, defaultFloat = YogaConstants.UNDEFINED)
+  public void setColumnGap(float columnGap) {
+    if (isVirtual()) {
+      return;
+    }
+    super.setColumnGap(PixelUtil.toPixelFromDIP(columnGap));
+  }
+
+  @ReactProp(name = ViewProps.GAP, defaultFloat = YogaConstants.UNDEFINED)
+  public void setGap(float gap) {
+    if (isVirtual()) {
+      return;
+    }
+    super.setGap(PixelUtil.toPixelFromDIP(gap));
+  }
+
   @ReactProp(name = ViewProps.FLEX_SHRINK, defaultFloat = 0f)
   public void setFlexShrink(float flexShrink) {
     if (isVirtual()) {

ReactAndroid/src/main/java/com/facebook/react/uimanager/ReactShadowNode.java

@@ -308,6 +308,12 @@ public interface ReactShadowNode<T extends ReactShadowNode> {
 
   void setFlexGrow(float flexGrow);
 
+  void setRowGap(float rowGap);
+
+  void setColumnGap(float columnGap);
+
+  void setGap(float gap);
+
   void setFlexShrink(float flexShrink);
 
   void setFlexBasis(float flexBasis);

ReactAndroid/src/main/java/com/facebook/react/uimanager/ReactShadowNodeImpl.java

@@ -18,6 +18,7 @@ import com.facebook.yoga.YogaDirection;
 import com.facebook.yoga.YogaDisplay;
 import com.facebook.yoga.YogaEdge;
 import com.facebook.yoga.YogaFlexDirection;
+import com.facebook.yoga.YogaGutter;
 import com.facebook.yoga.YogaJustify;
 import com.facebook.yoga.YogaMeasureFunction;
 import com.facebook.yoga.YogaNode;
@@ -794,6 +795,21 @@ public class ReactShadowNodeImpl implements ReactShadowNode<ReactShadowNodeImpl>
     mYogaNode.setFlexGrow(flexGrow);
   }
 
+  @Override
+  public void setRowGap(float rowGap) {
+    mYogaNode.setGap(YogaGutter.ROW, rowGap);
+  }
+
+  @Override
+  public void setColumnGap(float columnGap) {
+    mYogaNode.setGap(YogaGutter.COLUMN, columnGap);
+  }
+
+  @Override
+  public void setGap(float gap) {
+    mYogaNode.setGap(YogaGutter.ALL, gap);
+  }
+
   @Override
   public void setFlexShrink(float flexShrink) {
     mYogaNode.setFlexShrink(flexShrink);

ReactAndroid/src/main/java/com/facebook/react/uimanager/ViewProps.java

@@ -32,6 +32,9 @@ public class ViewProps {
   public static final String FLEX_BASIS = "flexBasis";
   public static final String FLEX_DIRECTION = "flexDirection";
   public static final String FLEX_WRAP = "flexWrap";
+  public static final String ROW_GAP = "rowGap";
+  public static final String COLUMN_GAP = "columnGap";
+  public static final String GAP = "gap";
   public static final String HEIGHT = "height";
   public static final String JUSTIFY_CONTENT = "justifyContent";
   public static final String LEFT = "left";
@@ -203,6 +206,9 @@ public class ViewProps {
               FLEX_BASIS,
               FLEX_DIRECTION,
               FLEX_GROW,
+              ROW_GAP,
+              COLUMN_GAP,
+              GAP,
               FLEX_SHRINK,
               FLEX_WRAP,
               JUSTIFY_CONTENT,

ReactCommon/react/renderer/components/view/YogaStylableProps.cpp

@@ -65,6 +65,11 @@ static inline T const getFieldValue(
   REBUILD_YG_FIELD_SWITCH_CASE_INDEXED(field, YGDimensionWidth, widthStr); \
   REBUILD_YG_FIELD_SWITCH_CASE_INDEXED(field, YGDimensionHeight, heightStr);
 
+#define REBUILD_FIELD_YG_GUTTER(field, rowGapStr, columnGapStr, gapStr)      \
+  REBUILD_YG_FIELD_SWITCH_CASE_INDEXED(field, YGGutterRow, rowGapStr);       \
+  REBUILD_YG_FIELD_SWITCH_CASE_INDEXED(field, YGGutterColumn, columnGapStr); \
+  REBUILD_YG_FIELD_SWITCH_CASE_INDEXED(field, YGGutterAll, gapStr);
+
 #define REBUILD_FIELD_YG_EDGES(field, prefix, suffix)                          \
   REBUILD_YG_FIELD_SWITCH_CASE_INDEXED(                                        \
       field, YGEdgeLeft, prefix "Left" suffix);                                \
@@ -114,6 +119,7 @@ void YogaStylableProps::setProp(
     REBUILD_FIELD_SWITCH_CASE_YSP(flexShrink);
     REBUILD_FIELD_SWITCH_CASE_YSP(flexBasis);
     REBUILD_FIELD_SWITCH_CASE2(positionType, "position");
+    REBUILD_FIELD_YG_GUTTER(gap, "rowGap", "columnGap", "gap");
     REBUILD_FIELD_SWITCH_CASE_YSP(aspectRatio);
     REBUILD_FIELD_YG_DIMENSION(dimensions, "width", "height");
     REBUILD_FIELD_YG_DIMENSION(minDimensions, "minWidth", "minHeight");
@@ -163,6 +169,18 @@ SharedDebugStringConvertibleList YogaStylableProps::getDebugProps() const {
           "flex", yogaStyle.flex(), defaultYogaStyle.flex()),
       debugStringConvertibleItem(
           "flexGrow", yogaStyle.flexGrow(), defaultYogaStyle.flexGrow()),
+      debugStringConvertibleItem(
+          "rowGap",
+          yogaStyle.gap()[YGGutterRow],
+          defaultYogaStyle.gap()[YGGutterRow]),
+      debugStringConvertibleItem(
+          "columnGap",
+          yogaStyle.gap()[YGGutterColumn],
+          defaultYogaStyle.gap()[YGGutterColumn]),
+      debugStringConvertibleItem(
+          "gap",
+          yogaStyle.gap()[YGGutterAll],
+          defaultYogaStyle.gap()[YGGutterAll]),
       debugStringConvertibleItem(
           "flexShrink", yogaStyle.flexShrink(), defaultYogaStyle.flexShrink()),
       debugStringConvertibleItem(

ReactCommon/react/renderer/components/view/propsConversions.h

@@ -266,6 +266,28 @@ static inline YGStyle convertRawProp(
       "",
       sourceValue.padding(),
       yogaStyle.padding());
+
+  yogaStyle.gap()[YGGutterRow] = convertRawProp(
+      context,
+      rawProps,
+      "rowGap",
+      sourceValue.gap()[YGGutterRow],
+      yogaStyle.gap()[YGGutterRow]);
+
+  yogaStyle.gap()[YGGutterColumn] = convertRawProp(
+      context,
+      rawProps,
+      "columnGap",
+      sourceValue.gap()[YGGutterColumn],
+      yogaStyle.gap()[YGGutterColumn]);
+
+  yogaStyle.gap()[YGGutterAll] = convertRawProp(
+      context,
+      rawProps,
+      "gap",
+      sourceValue.gap()[YGGutterAll],
+      yogaStyle.gap()[YGGutterAll]);
+
   yogaStyle.border() = convertRawProp(
       context,
       rawProps,

ReactCommon/react/test_utils/shadowTreeGeneration.h

@@ -8,6 +8,7 @@
 #pragma once
 
 #include <glog/logging.h>
+#include <gtest/gtest.h>
 #include <algorithm>
 #include <iostream>
 #include <memory>
@@ -233,6 +234,11 @@ static inline ShadowNode::Unshared messWithYogaStyles(
       "maxWidth",     "maxHeight",     "minWidth",    "minHeight",
   };
 
+  // It is not safe to add new Yoga properties to this list. Unit tests
+  // validate specific seeds, and what they test may change and cause unrelated
+  // failures if the size of properties also changes.
+  EXPECT_EQ(properties.size(), 20);
+
   for (auto const &property : properties) {
     if (entropy.random<bool>(0.1)) {
       dynamic[property] = entropy.random<int>(0, 1024);

packages/rn-tester/js/examples/View/ViewExample.js

@@ -299,6 +299,40 @@ class DisplayNoneStyle extends React.Component<
     this.setState({index: this.state.index + 1});
   };
 }
+
+class FlexGapExample extends React.Component<$ReadOnly<{||}>> {
+  render(): React.Node {
+    return (
+      <View
+        style={{
+          flexDirection: 'row',
+          flexWrap: 'wrap',
+          borderWidth: 1,
+          rowGap: 20,
+          columnGap: 30,
+        }}>
+        <View style={{backgroundColor: 'black', height: 30, width: 30}} />
+        <View style={{backgroundColor: 'black', height: 30, width: 30}} />
+        <View
+          style={{
+            backgroundColor: 'pink',
+            height: 30,
+            flexBasis: 30,
+          }}
+        />
+        <View style={{backgroundColor: 'black', height: 30, width: 30}} />
+        <View style={{backgroundColor: 'black', height: 30, width: 30}} />
+        <View style={{backgroundColor: 'black', height: 30, width: 30}} />
+        <View style={{backgroundColor: 'black', height: 30, width: 30}} />
+        <View style={{backgroundColor: 'pink', height: 30, width: 30}} />
+        <View style={{backgroundColor: 'pink', height: 30, width: 30}} />
+        <View style={{backgroundColor: 'pink', height: 30, width: 30}} />
+        <View style={{backgroundColor: 'pink', height: 30, width: 30}} />
+      </View>
+    );
+  }
+}
+
 exports.title = 'View';
 exports.documentationURL = 'https://reactnative.dev/docs/view';
 exports.category = 'Basic';
@@ -612,4 +646,10 @@ exports.examples = [
       );
     },
   },
+  {
+    title: 'FlexGap',
+    render(): React.Node {
+      return <FlexGapExample />;
+    },
+  },
 ];