react-native/React/Views/RCTScrollView.h

/**
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

#import <UIKit/UIScrollView.h>

#import "RCTAutoInsetsProtocol.h"
#import "RCTEventDispatcher.h"
#import "RCTScrollableProtocol.h"
#import "RCTView.h"

@protocol UIScrollViewDelegate;

@interface RCTScrollView : RCTView <UIScrollViewDelegate, RCTScrollableProtocol, RCTAutoInsetsProtocol>

- (instancetype)initWithEventDispatcher:(RCTEventDispatcher *)eventDispatcher NS_DESIGNATED_INITIALIZER;

/**
 * The `RCTScrollView` may have at most one single subview. This will ensure
 * that the scroll view's `contentSize` will be efficiently set to the size of
 * the single subview's frame. That frame size will be determined somewhat
 * efficiently since it will have already been computed by the off-main-thread
 * layout system.
 */
@property (nonatomic, readonly) UIView *contentView;

/**
 * If the `contentSize` is not specified (or is specified as {0, 0}, then the
 * `contentSize` will automatically be determined by the size of the subview.
 */
@property (nonatomic, assign) CGSize contentSize;

/**
 * The underlying scrollView (TODO: can we remove this?)
 */
@property (nonatomic, readonly) UIScrollView *scrollView;

@property (nonatomic, assign) UIEdgeInsets contentInset;
@property (nonatomic, assign) BOOL automaticallyAdjustContentInsets;
@property (nonatomic, assign) NSTimeInterval scrollEventThrottle;
@property (nonatomic, assign) BOOL centerContent;
@property (nonatomic, copy) NSIndexSet *stickyHeaderIndices;

@end

@interface RCTEventDispatcher (RCTScrollView)

/**
 * Send a scroll event.
 * (You can send a fake scroll event by passing nil for scrollView).
 */
- (void)sendScrollEventWithType:(RCTScrollEventType)type
                       reactTag:(NSNumber *)reactTag
                     scrollView:(UIScrollView *)scrollView
                       userData:(NSDictionary *)userData;

@end