[fabric] Add draggedTypes prop to View

Summary: Add support for `draggedTypes` to the View component, enabling the configuration of a native view as a drop target.

Test Plan:
* Run Zeratul with Fabric enabled
* Drag a file over the messages view and check that the cursor is changing indicating a drop target

 https://pxl.cl/4ldkW

Reviewers: shawndempsey, #rn-desktop

Reviewed By: shawndempsey

Subscribers: taskcreeper

Differential Revision: https://phabricator.intern.facebook.com/D53674739

Author: Nick Lefever

packages/react-native/React/Fabric/Mounting/ComponentViews/View/RCTViewComponentView.mm

@@ -588,6 +588,30 @@ - (void)updateProps:(const Props::Shared &)props oldProps:(const Props::Shared &
     needsInvalidateLayer = YES;
   }
 
+#if TARGET_OS_OSX // [macOS
+    // `draggedTypes`
+  if (oldViewProps.draggedTypes != newViewProps.draggedTypes) {
+    if (oldViewProps.draggedTypes.has_value()) {
+      [self unregisterDraggedTypes];
+    }
+    
+    if (newViewProps.draggedTypes.has_value()) {
+      NSMutableArray<NSPasteboardType> *pasteboardTypes = [NSMutableArray new];
+      for (const auto &draggedType : *newViewProps.draggedTypes) {
+        if (draggedType == "fileUrl") {
+          [pasteboardTypes addObject:NSFilenamesPboardType];
+        } else if (draggedType == "image") {
+          [pasteboardTypes addObject:NSPasteboardTypePNG];
+          [pasteboardTypes addObject:NSPasteboardTypeTIFF];
+        } else if (draggedType == "string") {
+          [pasteboardTypes addObject:NSPasteboardTypeString];
+        }
+      }
+      [self registerForDraggedTypes:pasteboardTypes];
+    }
+  }
+#endif // macOS]
+
   _needsInvalidateLayer = _needsInvalidateLayer || needsInvalidateLayer;
 
   _props = std::static_pointer_cast<const ViewProps>(props);

packages/react-native/ReactCommon/react/renderer/components/view/platform/macos/react/renderer/components/view/HostPlatformViewProps.cpp

@@ -65,7 +65,16 @@ HostPlatformViewProps::HostPlatformViewProps(
                     rawProps,
                     "keyUpEvents",
                     sourceProps.keyUpEvents,
-                    {})) {}
+                    {})),
+      draggedTypes(
+          ReactNativeFeatureFlags::enableCppPropsIteratorSetter()
+              ? sourceProps.draggedTypes
+              : convertRawProp(
+                context,
+                rawProps,
+                "draggedTypes",
+                sourceProps.draggedTypes,
+                {})) {};
 
 #define VIEW_EVENT_CASE_MACOS(eventType)                           \
   case CONSTEXPR_RAW_PROPS_KEY_HASH("on" #eventType): {            \

packages/react-native/ReactCommon/react/renderer/components/view/platform/macos/react/renderer/components/view/HostPlatformViewProps.h

@@ -43,5 +43,7 @@ class HostPlatformViewProps : public BaseViewProps {
 
   std::vector<HandledKey> keyDownEvents{};
   std::vector<HandledKey> keyUpEvents{};
+
+  std::vector<std::string> draggedTypes{};
 };
 } // namespace facebook::react