Implement ScrollView.contentInsetAdjustmentBehavior

Summary:
Changelog: [internal]

Fabric's ScrollView was ignoring value of `ScrollView.contentInsetAdjustmentBehavior`, this diff fixes that.

Reviewed By: shergin

Differential Revision: D23102235

fbshipit-source-id: 8cf42e730b560a21d56d7e007059109ccd01154e

React/Fabric/Mounting/ComponentViews/ScrollView/RCTScrollViewComponentView.mm

@@ -201,6 +201,21 @@ static void RCTSendPaperScrollEvent_DEPRECATED(UIScrollView *scrollView, NSInteg
     scrollView.snapToOffsets = snapToOffsets;
   }
 
+  if (@available(iOS 11.0, *)) {
+    if (oldScrollViewProps.contentInsetAdjustmentBehavior != newScrollViewProps.contentInsetAdjustmentBehavior) {
+      auto const contentInsetAdjustmentBehavior = newScrollViewProps.contentInsetAdjustmentBehavior;
+      if (contentInsetAdjustmentBehavior == ContentInsetAdjustmentBehavior::Never) {
+        scrollView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
+      } else if (contentInsetAdjustmentBehavior == ContentInsetAdjustmentBehavior::Automatic) {
+        scrollView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentAutomatic;
+      } else if (contentInsetAdjustmentBehavior == ContentInsetAdjustmentBehavior::ScrollableAxes) {
+        scrollView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentAutomatic;
+      } else if (contentInsetAdjustmentBehavior == ContentInsetAdjustmentBehavior::Always) {
+        scrollView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentAlways;
+      }
+    }
+  }
+
   MAP_SCROLL_VIEW_PROP(disableIntervalMomentum);
   MAP_SCROLL_VIEW_PROP(snapToInterval);
 

ReactCommon/react/renderer/components/scrollview/ScrollViewProps.cpp

@@ -159,7 +159,12 @@ ScrollViewProps::ScrollViewProps(
       snapToStart(
           convertRawProp(rawProps, "snapToStart", sourceProps.snapToStart, {})),
       snapToEnd(
-          convertRawProp(rawProps, "snapToEnd", sourceProps.snapToEnd, {})) {}
+          convertRawProp(rawProps, "snapToEnd", sourceProps.snapToEnd, {})),
+      contentInsetAdjustmentBehavior(convertRawProp(
+          rawProps,
+          "contentInsetAdjustmentBehavior",
+          sourceProps.contentInsetAdjustmentBehavior,
+          {ContentInsetAdjustmentBehavior::Never})) {}
 
 #pragma mark - DebugStringConvertible
 

ReactCommon/react/renderer/components/scrollview/ScrollViewProps.h

@@ -51,6 +51,8 @@ class ScrollViewProps final : public ViewProps {
   std::vector<Float> snapToOffsets{};
   bool snapToStart{true};
   bool snapToEnd{true};
+  ContentInsetAdjustmentBehavior contentInsetAdjustmentBehavior{
+      ContentInsetAdjustmentBehavior::Never};
 
 #pragma mark - DebugStringConvertible
 

ReactCommon/react/renderer/components/scrollview/conversions.h

@@ -70,6 +70,29 @@ inline void fromRawValue(
   abort();
 }
 
+inline void fromRawValue(
+    const RawValue &value,
+    ContentInsetAdjustmentBehavior &result) {
+  auto string = (std::string)value;
+  if (string == "never") {
+    result = ContentInsetAdjustmentBehavior::Never;
+    return;
+  }
+  if (string == "automatic") {
+    result = ContentInsetAdjustmentBehavior::Automatic;
+    return;
+  }
+  if (string == "scrollableAxes") {
+    result = ContentInsetAdjustmentBehavior::ScrollableAxes;
+    return;
+  }
+  if (string == "always") {
+    result = ContentInsetAdjustmentBehavior::Always;
+    return;
+  }
+  abort();
+}
+
 inline std::string toString(const ScrollViewSnapToAlignment &value) {
   switch (value) {
     case ScrollViewSnapToAlignment::Start:
@@ -103,5 +126,18 @@ inline std::string toString(const ScrollViewKeyboardDismissMode &value) {
   }
 }
 
+inline std::string toString(const ContentInsetAdjustmentBehavior &value) {
+  switch (value) {
+    case ContentInsetAdjustmentBehavior::Never:
+      return "never";
+    case ContentInsetAdjustmentBehavior::Automatic:
+      return "automatic";
+    case ContentInsetAdjustmentBehavior::ScrollableAxes:
+      return "scrollableAxes";
+    case ContentInsetAdjustmentBehavior::Always:
+      return "always";
+  }
+}
+
 } // namespace react
 } // namespace facebook

ReactCommon/react/renderer/components/scrollview/primitives.h

@@ -16,5 +16,12 @@ enum class ScrollViewIndicatorStyle { Default, Black, White };
 
 enum class ScrollViewKeyboardDismissMode { None, OnDrag, Interactive };
 
+enum class ContentInsetAdjustmentBehavior {
+  Never,
+  Automatic,
+  ScrollableAxes,
+  Always
+};
+
 } // namespace react
 } // namespace facebook