[fabric] Add wrapper class for TextView with scroll callback support

Summary:
The multiline text input view on macOS needs its own view hierarchy, wrapping the RCTUITextView in a scroll view to support all the features offered by the React TextInput component.

This diff adds a wrapper class for RCTUITextView that provides the appropriate view hierarchy while still supporting the text input protocols required for text input.

The wrapper forwards all unimplemented methods to the RCTUITextView so that it can be used as a direct substitute for the RCTUITextView. This allows us to reduce the custom changes need for macOS in RCTTextInputComponentView while re-using all the logic in RCTUITextView.

Test Plan: Tested later in this stack.

Reviewers: shawndempsey, #rn-desktop

Reviewed By: shawndempsey

Differential Revision: https://phabricator.intern.facebook.com/D51962394

Tasks: T167538822, T157889591

Tags: uikit-diff

Author: Nick Lefever

packages/react-native/Libraries/Text/TextInput/Multiline/RCTWrappedTextView.h

@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#if TARGET_OS_OSX // [macOS
+
+#import <React/RCTUIKit.h>
+
+#import "RCTTextUIKit.h"
+
+#import <React/RCTBackedTextInputDelegate.h>
+#import <React/RCTBackedTextInputViewProtocol.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface RCTWrappedTextView : RCTPlatformView <RCTBackedTextInputViewProtocol>
+
+@property (nonatomic, weak) id<RCTBackedTextInputDelegate> textInputDelegate;
+@property (assign) BOOL hideVerticalScrollIndicator;
+
+@end
+
+NS_ASSUME_NONNULL_END
+
+#endif // macOS]

packages/react-native/Libraries/Text/TextInput/Multiline/RCTWrappedTextView.m

@@ -0,0 +1,194 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#if TARGET_OS_OSX // [macOS
+
+#import <React/RCTWrappedTextView.h>
+
+#import <React/RCTUITextView.h>
+#import <React/RCTTextAttributes.h>
+
+@implementation RCTWrappedTextView {
+  RCTUITextView *_forwardingTextView;
+  RCTUIScrollView *_scrollView;
+  RCTClipView *_clipView;
+}
+
+- (instancetype)initWithFrame:(CGRect)frame
+{
+  if (self = [super initWithFrame:frame]) {
+    self.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
+
+    self.hideVerticalScrollIndicator = NO;
+
+    _scrollView = [[RCTUIScrollView alloc] initWithFrame:self.bounds];
+    _scrollView.backgroundColor = [RCTUIColor clearColor];
+    _scrollView.drawsBackground = NO;
+    _scrollView.borderType = NSNoBorder;
+    _scrollView.hasHorizontalRuler = NO;
+    _scrollView.hasVerticalRuler = NO;
+    _scrollView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
+    [_scrollView setHasVerticalScroller:YES];
+    [_scrollView setHasHorizontalScroller:NO];
+    
+    _clipView = [[RCTClipView alloc] initWithFrame:_scrollView.bounds];
+    [_scrollView setContentView:_clipView];
+    
+    _forwardingTextView = [[RCTUITextView alloc] initWithFrame:_scrollView.bounds];
+    _forwardingTextView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
+    _forwardingTextView.delegate = self;
+    
+    _forwardingTextView.verticallyResizable = YES;
+    _forwardingTextView.horizontallyResizable = YES;
+    _forwardingTextView.textContainer.containerSize = NSMakeSize(FLT_MAX, FLT_MAX);
+    _forwardingTextView.textContainer.widthTracksTextView = YES;
+    _forwardingTextView.textInputDelegate = self;
+    
+    _scrollView.documentView = _forwardingTextView;
+    _scrollView.contentView.postsBoundsChangedNotifications = YES;
+    
+    // Enable the focus ring by default
+    _scrollView.enableFocusRing = YES;
+    [self addSubview:_scrollView];
+    
+    // a register for those notifications on the content view.
+    [[NSNotificationCenter defaultCenter] addObserver:self
+                                             selector:@selector(boundsDidChange:)
+                                                 name:NSViewBoundsDidChangeNotification
+                                               object:_scrollView.contentView];
+  }
+
+  return self;
+}
+
+- (void)dealloc
+{
+  [[NSNotificationCenter defaultCenter] removeObserver:self];
+}
+
+- (BOOL)isFlipped
+{
+  return YES;
+}
+
+#pragma mark -
+#pragma mark Method forwarding to text view
+
+- (void)forwardInvocation:(NSInvocation *)invocation
+{
+  [invocation invokeWithTarget:_forwardingTextView];
+}
+
+- (NSMethodSignature *)methodSignatureForSelector:(SEL)selector
+{
+  if ([_forwardingTextView respondsToSelector:selector]) {
+    return [_forwardingTextView methodSignatureForSelector:selector];
+  }
+  
+  return [super methodSignatureForSelector:selector];
+}
+
+- (void)boundsDidChange:(NSNotification *)notification
+{
+}
+
+#pragma mark -
+#pragma mark First Responder forwarding
+
+- (NSResponder *)responder
+{
+  return _forwardingTextView;
+}
+
+- (BOOL)acceptsFirstResponder
+{
+  return _forwardingTextView.acceptsFirstResponder;
+}
+
+- (BOOL)becomeFirstResponder
+{
+  return [_forwardingTextView becomeFirstResponder];
+}
+
+- (BOOL)resignFirstResponder
+{
+  return [_forwardingTextView resignFirstResponder];
+}
+
+#pragma mark -
+#pragma mark Text Input delegate forwarding
+
+- (id<RCTBackedTextInputDelegate>)textInputDelegate
+{
+  return _forwardingTextView.textInputDelegate;
+}
+
+- (void)setTextInputDelegate:(id<RCTBackedTextInputDelegate>)textInputDelegate
+{
+  _forwardingTextView.textInputDelegate = textInputDelegate;
+}
+
+#pragma mark -
+#pragma mark Scrolling control
+
+- (BOOL)scrollEnabled
+{
+  return _scrollView.isScrollEnabled;
+}
+
+- (void)setScrollEnabled:(BOOL)scrollEnabled
+{
+  if (scrollEnabled) {
+    _scrollView.scrollEnabled = YES;
+    [_clipView setConstrainScrolling:NO];
+  } else {
+    _scrollView.scrollEnabled = NO;
+    [_clipView setConstrainScrolling:YES];
+  }
+}
+
+- (BOOL)shouldShowVerticalScrollbar
+{
+  // Hide vertical scrollbar if explicity set to NO
+  if (self.hideVerticalScrollIndicator) {
+    return NO;
+  }
+
+  // Hide vertical scrollbar if attributed text overflows view
+  CGSize textViewSize = [_forwardingTextView intrinsicContentSize];
+  NSClipView *clipView = (NSClipView *)_scrollView.contentView;
+  if (textViewSize.height > clipView.bounds.size.height) {
+    return YES;
+  };
+
+  return NO;
+}
+
+- (void)textInputDidChange
+{
+  [_scrollView setHasVerticalScroller:[self shouldShowVerticalScrollbar]];
+}
+
+- (void)setAttributedText:(NSAttributedString *)attributedText
+{
+  [_forwardingTextView setAttributedText:attributedText];
+  [_scrollView setHasVerticalScroller:[self shouldShowVerticalScrollbar]];
+}
+
+#pragma mark -
+#pragma mark Text Container Inset override for NSTextView
+
+// This method is there to match the textContainerInset property on RCTUITextField
+- (void)setTextContainerInset:(UIEdgeInsets)textContainerInsets
+{
+  // RCTUITextView has logic in setTextContainerInset[s] to convert th UIEdgeInsets to a valid NSSize struct
+  _forwardingTextView.textContainerInsets = textContainerInsets;
+}
+
+@end
+
+#endif // macOS]