1074 lines
42 KiB
Objective-C
1074 lines
42 KiB
Objective-C
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#import "RCTScrollView.h"
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#import <UIKit/UIKit.h>
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#import "RCTConvert.h"
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#import "RCTLog.h"
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#import "RCTRefreshControl.h"
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#import "RCTScrollEvent.h"
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#import "RCTUIManager.h"
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#import "RCTUIManagerObserverCoordinator.h"
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#import "RCTUIManagerUtils.h"
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#import "RCTUtils.h"
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#import "RCTViewUtils.h"
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#import "UIView+Private.h"
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#import "UIView+React.h"
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/**
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* Include a custom scroll view subclass because we want to limit certain
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* default UIKit behaviors such as textFields automatically scrolling
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* scroll views that contain them.
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*/
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@interface RCTCustomScrollView : UIScrollView <UIGestureRecognizerDelegate>
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@property (nonatomic, assign) BOOL centerContent;
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@property (nonatomic, strong) UIView<RCTCustomRefreshControlProtocol> *customRefreshControl;
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@property (nonatomic, assign) BOOL pinchGestureEnabled;
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@end
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@implementation RCTCustomScrollView
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- (instancetype)initWithFrame:(CGRect)frame
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{
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if ((self = [super initWithFrame:frame])) {
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[self.panGestureRecognizer addTarget:self action:@selector(handleCustomPan:)];
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if ([self respondsToSelector:@selector(setSemanticContentAttribute:)]) {
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// We intentionally force `UIScrollView`s `semanticContentAttribute` to `LTR` here
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// because this attribute affects a position of vertical scrollbar; we don't want this
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// scrollbar flip because we also flip it with whole `UIScrollView` flip.
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self.semanticContentAttribute = UISemanticContentAttributeForceLeftToRight;
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}
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_pinchGestureEnabled = YES;
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}
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return self;
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}
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- (UIView *)contentView
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{
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return ((RCTScrollView *)self.superview).contentView;
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}
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/**
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* @return Whether or not the scroll view interaction should be blocked because
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* JS was found to be the responder.
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*/
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- (BOOL)_shouldDisableScrollInteraction
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{
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// Since this may be called on every pan, we need to make sure to only climb
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// the hierarchy on rare occasions.
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UIView *JSResponder = [RCTUIManager JSResponder];
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if (JSResponder && JSResponder != self.superview) {
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BOOL superviewHasResponder = [self isDescendantOfView:JSResponder];
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return superviewHasResponder;
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}
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return NO;
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}
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- (void)handleCustomPan:(__unused UIPanGestureRecognizer *)sender
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{
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if ([self _shouldDisableScrollInteraction] && ![[RCTUIManager JSResponder] isKindOfClass:[RCTScrollView class]]) {
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self.panGestureRecognizer.enabled = NO;
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self.panGestureRecognizer.enabled = YES;
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// TODO: If mid bounce, animate the scroll view to a non-bounced position
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// while disabling (but only if `stopScrollInteractionIfJSHasResponder` was
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// called *during* a `pan`). Currently, it will just snap into place which
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// is not so bad either.
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// Another approach:
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// self.scrollEnabled = NO;
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// self.scrollEnabled = YES;
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}
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}
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- (void)scrollRectToVisible:(CGRect)rect animated:(BOOL)animated
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{
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// Limiting scroll area to an area where we actually have content.
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CGSize contentSize = self.contentSize;
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UIEdgeInsets contentInset = self.contentInset;
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CGSize fullSize = CGSizeMake(
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contentSize.width + contentInset.left + contentInset.right,
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contentSize.height + contentInset.top + contentInset.bottom);
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rect = CGRectIntersection((CGRect){CGPointZero, fullSize}, rect);
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if (CGRectIsNull(rect)) {
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return;
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}
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[super scrollRectToVisible:rect animated:animated];
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}
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/**
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* Returning `YES` cancels touches for the "inner" `view` and causes a scroll.
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* Returning `NO` causes touches to be directed to that inner view and prevents
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* the scroll view from scrolling.
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*
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* `YES` -> Allows scrolling.
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* `NO` -> Doesn't allow scrolling.
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*
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* By default this returns NO for all views that are UIControls and YES for
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* everything else. What that does is allows scroll views to scroll even when a
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* touch started inside of a `UIControl` (`UIButton` etc). For React scroll
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* views, we want the default to be the same behavior as `UIControl`s so we
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* return `YES` by default. But there's one case where we want to block the
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* scrolling no matter what: When JS believes it has its own responder lock on
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* a view that is *above* the scroll view in the hierarchy. So we abuse this
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* `touchesShouldCancelInContentView` API in order to stop the scroll view from
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* scrolling in this case.
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*
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* We are not aware of *any* other solution to the problem because alternative
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* approaches require that we disable the scrollview *before* touches begin or
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* move. This approach (`touchesShouldCancelInContentView`) works even if the
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* JS responder is set after touches start/move because
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* `touchesShouldCancelInContentView` is called as soon as the scroll view has
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* been touched and dragged *just* far enough to decide to begin the "drag"
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* movement of the scroll interaction. Returning `NO`, will cause the drag
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* operation to fail.
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*
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* `touchesShouldCancelInContentView` will stop the *initialization* of a
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* scroll pan gesture and most of the time this is sufficient. On rare
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* occasion, the scroll gesture would have already initialized right before JS
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* notifies native of the JS responder being set. In order to recover from that
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* timing issue we have a fallback that kills any ongoing pan gesture that
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* occurs when native is notified of a JS responder.
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*
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* Note: Explicitly returning `YES`, instead of relying on the default fixes
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* (at least) one bug where if you have a UIControl inside a UIScrollView and
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* tap on the UIControl and then start dragging (to scroll), it won't scroll.
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* Chat with @andras for more details.
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*
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* In order to have this called, you must have delaysContentTouches set to NO
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* (which is the not the `UIKit` default).
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*/
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- (BOOL)touchesShouldCancelInContentView:(__unused UIView *)view
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{
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BOOL shouldDisableScrollInteraction = [self _shouldDisableScrollInteraction];
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if (shouldDisableScrollInteraction == NO) {
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[super touchesShouldCancelInContentView:view];
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}
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return !shouldDisableScrollInteraction;
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}
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/*
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* Automatically centers the content such that if the content is smaller than the
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* ScrollView, we force it to be centered, but when you zoom or the content otherwise
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* becomes larger than the ScrollView, there is no padding around the content but it
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* can still fill the whole view.
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*/
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- (void)setContentOffset:(CGPoint)contentOffset
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{
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UIView *contentView = [self contentView];
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if (contentView && _centerContent && !CGSizeEqualToSize(contentView.frame.size, CGSizeZero)) {
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CGSize subviewSize = contentView.frame.size;
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CGSize scrollViewSize = self.bounds.size;
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if (subviewSize.width <= scrollViewSize.width) {
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contentOffset.x = -(scrollViewSize.width - subviewSize.width) / 2.0;
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}
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if (subviewSize.height <= scrollViewSize.height) {
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contentOffset.y = -(scrollViewSize.height - subviewSize.height) / 2.0;
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}
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}
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super.contentOffset = CGPointMake(
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RCTSanitizeNaNValue(contentOffset.x, @"scrollView.contentOffset.x"),
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RCTSanitizeNaNValue(contentOffset.y, @"scrollView.contentOffset.y"));
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}
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- (void)setFrame:(CGRect)frame
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{
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// Preserving and revalidating `contentOffset`.
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CGPoint originalOffset = self.contentOffset;
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[super setFrame:frame];
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UIEdgeInsets contentInset = self.contentInset;
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CGSize contentSize = self.contentSize;
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// If contentSize has not been measured yet we can't check bounds.
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if (CGSizeEqualToSize(contentSize, CGSizeZero)) {
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self.contentOffset = originalOffset;
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} else {
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if (!UIEdgeInsetsEqualToEdgeInsets(UIEdgeInsetsZero, self.adjustedContentInset)) {
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contentInset = self.adjustedContentInset;
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}
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CGSize boundsSize = self.bounds.size;
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CGFloat xMaxOffset = contentSize.width - boundsSize.width + contentInset.right;
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CGFloat yMaxOffset = contentSize.height - boundsSize.height + contentInset.bottom;
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// Make sure offset doesn't exceed bounds. This can happen on screen rotation.
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if ((originalOffset.x >= -contentInset.left) && (originalOffset.x <= xMaxOffset) &&
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(originalOffset.y >= -contentInset.top) && (originalOffset.y <= yMaxOffset)) {
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return;
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}
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self.contentOffset = CGPointMake(
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MAX(-contentInset.left, MIN(xMaxOffset, originalOffset.x)),
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MAX(-contentInset.top, MIN(yMaxOffset, originalOffset.y)));
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}
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}
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- (void)setCustomRefreshControl:(UIView<RCTCustomRefreshControlProtocol> *)refreshControl
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{
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if (_customRefreshControl) {
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[_customRefreshControl removeFromSuperview];
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}
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_customRefreshControl = refreshControl;
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// We have to set this because we can't always guarantee the
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// `RCTCustomRefreshControlProtocol`'s superview will always be of class
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// `UIScrollView` like we were previously
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if ([_customRefreshControl respondsToSelector:@selector(setScrollView:)]) {
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_customRefreshControl.scrollView = self;
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}
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if ([refreshControl isKindOfClass:UIRefreshControl.class]) {
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self.refreshControl = (UIRefreshControl *)refreshControl;
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} else {
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[self addSubview:_customRefreshControl];
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}
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}
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- (void)setPinchGestureEnabled:(BOOL)pinchGestureEnabled
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{
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self.pinchGestureRecognizer.enabled = pinchGestureEnabled;
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_pinchGestureEnabled = pinchGestureEnabled;
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}
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- (void)didMoveToWindow
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{
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[super didMoveToWindow];
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// ScrollView enables pinch gesture late in its lifecycle. So simply setting it
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// in the setter gets overridden when the view loads.
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self.pinchGestureRecognizer.enabled = _pinchGestureEnabled;
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}
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- (BOOL)shouldGroupAccessibilityChildren
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{
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return YES;
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}
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@end
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@interface RCTScrollView () <RCTUIManagerObserver>
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@end
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@implementation RCTScrollView {
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id<RCTEventDispatcherProtocol> _eventDispatcher;
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CGRect _prevFirstVisibleFrame;
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__weak UIView *_firstVisibleView;
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RCTCustomScrollView *_scrollView;
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UIView *_contentView;
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NSTimeInterval _lastScrollDispatchTime;
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NSMutableArray<NSValue *> *_cachedChildFrames;
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BOOL _allowNextScrollNoMatterWhat;
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CGRect _lastClippedToRect;
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uint16_t _coalescingKey;
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NSString *_lastEmittedEventName;
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NSHashTable *_scrollListeners;
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}
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- (void)_registerKeyboardListener
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{
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(_keyboardWillChangeFrame:)
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name:UIKeyboardWillChangeFrameNotification
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object:nil];
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}
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- (void)_unregisterKeyboardListener
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{
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[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillChangeFrameNotification object:nil];
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}
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static inline UIViewAnimationOptions animationOptionsWithCurve(UIViewAnimationCurve curve)
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{
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// UIViewAnimationCurve #7 is used for keyboard and therefore private - so we can't use switch/case here.
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// source: https://stackoverflow.com/a/7327374/5281431
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RCTAssert(
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UIViewAnimationCurveLinear << 16 == UIViewAnimationOptionCurveLinear,
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@"Unexpected implementation of UIViewAnimationCurve");
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return curve << 16;
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}
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- (void)_keyboardWillChangeFrame:(NSNotification *)notification
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{
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if (![self automaticallyAdjustKeyboardInsets]) {
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return;
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}
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if ([self isHorizontal:_scrollView]) {
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return;
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}
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double duration = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
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UIViewAnimationCurve curve =
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(UIViewAnimationCurve)[notification.userInfo[UIKeyboardAnimationCurveUserInfoKey] unsignedIntegerValue];
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CGRect beginFrame = [notification.userInfo[UIKeyboardFrameBeginUserInfoKey] CGRectValue];
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CGRect endFrame = [notification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
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CGPoint absoluteViewOrigin = [self convertPoint:self.bounds.origin toView:nil];
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CGFloat scrollViewLowerY = self.inverted ? absoluteViewOrigin.y : absoluteViewOrigin.y + self.bounds.size.height;
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UIEdgeInsets newEdgeInsets = _scrollView.contentInset;
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CGFloat inset = MAX(scrollViewLowerY - endFrame.origin.y, 0);
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if (self.inverted) {
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newEdgeInsets.top = MAX(inset, _contentInset.top);
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} else {
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newEdgeInsets.bottom = MAX(inset, _contentInset.bottom);
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}
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CGPoint newContentOffset = _scrollView.contentOffset;
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CGFloat contentDiff = endFrame.origin.y - beginFrame.origin.y;
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if (self.inverted) {
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newContentOffset.y += contentDiff;
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} else {
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newContentOffset.y -= contentDiff;
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}
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if (@available(iOS 14.0, *)) {
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// On iOS when Prefer Cross-Fade Transitions is enabled, the keyboard position
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// & height is reported differently (0 instead of Y position value matching height of frame)
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// Fixes similar issue we saw with https://github.com/facebook/react-native/pull/34503
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if (UIAccessibilityPrefersCrossFadeTransitions() && endFrame.size.height == 0) {
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newContentOffset.y = 0;
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newEdgeInsets.bottom = 0;
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}
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}
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[UIView animateWithDuration:duration
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delay:0.0
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options:animationOptionsWithCurve(curve)
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animations:^{
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self->_scrollView.contentInset = newEdgeInsets;
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self->_scrollView.scrollIndicatorInsets = newEdgeInsets;
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[self scrollToOffset:newContentOffset animated:NO];
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}
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completion:nil];
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}
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- (instancetype)initWithEventDispatcher:(id<RCTEventDispatcherProtocol>)eventDispatcher
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{
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RCTAssertParam(eventDispatcher);
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if ((self = [super initWithFrame:CGRectZero])) {
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[self _registerKeyboardListener];
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_eventDispatcher = eventDispatcher;
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_scrollView = [[RCTCustomScrollView alloc] initWithFrame:CGRectZero];
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_scrollView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
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_scrollView.delegate = self;
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_scrollView.delaysContentTouches = NO;
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// We set the default behavior to "never" so that iOS
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// doesn't do weird things to UIScrollView insets automatically
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// and keeps it as an opt-in behavior.
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_scrollView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
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_automaticallyAdjustContentInsets = YES;
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_contentInset = UIEdgeInsetsZero;
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_lastClippedToRect = CGRectNull;
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_scrollEventThrottle = 0.0;
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_lastScrollDispatchTime = 0;
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_cachedChildFrames = [NSMutableArray new];
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_scrollListeners = [NSHashTable weakObjectsHashTable];
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[self addSubview:_scrollView];
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}
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return self;
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}
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RCT_NOT_IMPLEMENTED(-(instancetype)initWithFrame : (CGRect)frame)
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RCT_NOT_IMPLEMENTED(-(instancetype)initWithCoder : (NSCoder *)aDecoder)
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static inline void RCTApplyTransformationAccordingLayoutDirection(
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UIView *view,
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UIUserInterfaceLayoutDirection layoutDirection)
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{
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view.transform = layoutDirection == UIUserInterfaceLayoutDirectionLeftToRight ? CGAffineTransformIdentity
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: CGAffineTransformMakeScale(-1, 1);
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}
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- (void)setReactLayoutDirection:(UIUserInterfaceLayoutDirection)layoutDirection
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{
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[super setReactLayoutDirection:layoutDirection];
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RCTApplyTransformationAccordingLayoutDirection(_scrollView, layoutDirection);
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RCTApplyTransformationAccordingLayoutDirection(_contentView, layoutDirection);
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}
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- (void)setRemoveClippedSubviews:(__unused BOOL)removeClippedSubviews
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{
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// Does nothing
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}
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- (void)insertReactSubview:(UIView *)view atIndex:(NSInteger)atIndex
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{
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[super insertReactSubview:view atIndex:atIndex];
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if ([view conformsToProtocol:@protocol(RCTCustomRefreshControlProtocol)]) {
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[_scrollView setCustomRefreshControl:(UIView<RCTCustomRefreshControlProtocol> *)view];
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if (![view isKindOfClass:[UIRefreshControl class]] && [view conformsToProtocol:@protocol(UIScrollViewDelegate)]) {
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[self addScrollListener:(UIView<UIScrollViewDelegate> *)view];
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}
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} else {
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RCTAssert(
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_contentView == nil,
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@"RCTScrollView may only contain a single subview, the already set subview looks like: %@",
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[_contentView react_recursiveDescription]);
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_contentView = view;
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RCTApplyTransformationAccordingLayoutDirection(_contentView, self.reactLayoutDirection);
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[_scrollView addSubview:view];
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}
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}
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- (void)removeReactSubview:(UIView *)subview
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{
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[super removeReactSubview:subview];
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if ([subview conformsToProtocol:@protocol(RCTCustomRefreshControlProtocol)]) {
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[_scrollView setCustomRefreshControl:nil];
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if (![subview isKindOfClass:[UIRefreshControl class]] &&
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[subview conformsToProtocol:@protocol(UIScrollViewDelegate)]) {
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[self removeScrollListener:(UIView<UIScrollViewDelegate> *)subview];
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}
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} else {
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RCTAssert(_contentView == subview, @"Attempted to remove non-existent subview");
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_contentView = nil;
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}
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}
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- (void)didUpdateReactSubviews
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{
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// Do nothing, as subviews are managed by `insertReactSubview:atIndex:`
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}
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- (void)didSetProps:(NSArray<NSString *> *)changedProps
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{
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if ([changedProps containsObject:@"contentSize"]) {
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[self updateContentSizeIfNeeded];
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}
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}
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- (BOOL)centerContent
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{
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return _scrollView.centerContent;
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}
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- (void)setCenterContent:(BOOL)centerContent
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{
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_scrollView.centerContent = centerContent;
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}
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- (void)setClipsToBounds:(BOOL)clipsToBounds
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{
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super.clipsToBounds = clipsToBounds;
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_scrollView.clipsToBounds = clipsToBounds;
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}
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- (void)dealloc
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{
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_scrollView.delegate = nil;
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[_eventDispatcher.bridge.uiManager.observerCoordinator removeObserver:self];
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[self _unregisterKeyboardListener];
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}
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- (void)layoutSubviews
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{
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[super layoutSubviews];
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RCTAssert(self.subviews.count == 1, @"we should only have exactly one subview");
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RCTAssert([self.subviews lastObject] == _scrollView, @"our only subview should be a scrollview");
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#if !TARGET_OS_TV
|
|
// Adjust the refresh control frame if the scrollview layout changes.
|
|
UIView<RCTCustomRefreshControlProtocol> *refreshControl = _scrollView.customRefreshControl;
|
|
if (refreshControl && refreshControl.isRefreshing && ![refreshControl isKindOfClass:UIRefreshControl.class]) {
|
|
refreshControl.frame =
|
|
(CGRect){_scrollView.contentOffset, {_scrollView.frame.size.width, refreshControl.frame.size.height}};
|
|
}
|
|
#endif
|
|
|
|
[self updateClippedSubviews];
|
|
}
|
|
|
|
- (void)updateClippedSubviews
|
|
{
|
|
// Find a suitable view to use for clipping
|
|
UIView *clipView = [self react_findClipView];
|
|
if (!clipView) {
|
|
return;
|
|
}
|
|
|
|
static const CGFloat leeway = 1.0;
|
|
|
|
const CGSize contentSize = _scrollView.contentSize;
|
|
const CGRect bounds = _scrollView.bounds;
|
|
const BOOL scrollsHorizontally = contentSize.width > bounds.size.width;
|
|
const BOOL scrollsVertically = contentSize.height > bounds.size.height;
|
|
|
|
const BOOL shouldClipAgain = CGRectIsNull(_lastClippedToRect) || !CGRectEqualToRect(_lastClippedToRect, bounds) ||
|
|
(scrollsHorizontally &&
|
|
(bounds.size.width < leeway || fabs(_lastClippedToRect.origin.x - bounds.origin.x) >= leeway)) ||
|
|
(scrollsVertically &&
|
|
(bounds.size.height < leeway || fabs(_lastClippedToRect.origin.y - bounds.origin.y) >= leeway));
|
|
|
|
if (shouldClipAgain) {
|
|
const CGRect clipRect = CGRectInset(clipView.bounds, -leeway, -leeway);
|
|
[self react_updateClippedSubviewsWithClipRect:clipRect relativeToView:clipView];
|
|
_lastClippedToRect = bounds;
|
|
}
|
|
}
|
|
|
|
- (void)setContentInset:(UIEdgeInsets)contentInset
|
|
{
|
|
if (UIEdgeInsetsEqualToEdgeInsets(contentInset, _contentInset)) {
|
|
return;
|
|
}
|
|
|
|
CGPoint contentOffset = _scrollView.contentOffset;
|
|
|
|
_contentInset = contentInset;
|
|
[RCTView autoAdjustInsetsForView:self withScrollView:_scrollView updateOffset:NO];
|
|
|
|
_scrollView.contentOffset = contentOffset;
|
|
}
|
|
|
|
- (BOOL)isHorizontal:(UIScrollView *)scrollView
|
|
{
|
|
return scrollView.contentSize.width > self.frame.size.width;
|
|
}
|
|
|
|
- (void)scrollToOffset:(CGPoint)offset
|
|
{
|
|
[self scrollToOffset:offset animated:YES];
|
|
}
|
|
|
|
- (void)scrollToOffset:(CGPoint)offset animated:(BOOL)animated
|
|
{
|
|
if (!CGPointEqualToPoint(_scrollView.contentOffset, offset)) {
|
|
CGRect maxRect = CGRectMake(
|
|
fmin(-_scrollView.contentInset.left, 0),
|
|
fmin(-_scrollView.contentInset.top, 0),
|
|
fmax(
|
|
_scrollView.contentSize.width - _scrollView.bounds.size.width + _scrollView.contentInset.right +
|
|
fmax(_scrollView.contentInset.left, 0),
|
|
0.01),
|
|
fmax(
|
|
_scrollView.contentSize.height - _scrollView.bounds.size.height + _scrollView.contentInset.bottom +
|
|
fmax(_scrollView.contentInset.top, 0),
|
|
0.01)); // Make width and height greater than 0
|
|
// Ensure at least one scroll event will fire
|
|
_allowNextScrollNoMatterWhat = YES;
|
|
if (!CGRectContainsPoint(maxRect, offset) && !self.scrollToOverflowEnabled) {
|
|
CGFloat x = fmax(offset.x, CGRectGetMinX(maxRect));
|
|
x = fmin(x, CGRectGetMaxX(maxRect));
|
|
CGFloat y = fmax(offset.y, CGRectGetMinY(maxRect));
|
|
y = fmin(y, CGRectGetMaxY(maxRect));
|
|
offset = CGPointMake(x, y);
|
|
}
|
|
[_scrollView setContentOffset:offset animated:animated];
|
|
}
|
|
}
|
|
|
|
/**
|
|
* If this is a vertical scroll view, scrolls to the bottom.
|
|
* If this is a horizontal scroll view, scrolls to the right.
|
|
*/
|
|
- (void)scrollToEnd:(BOOL)animated
|
|
{
|
|
BOOL isHorizontal = [self isHorizontal:_scrollView];
|
|
CGPoint offset;
|
|
if (isHorizontal) {
|
|
CGFloat offsetX = _scrollView.contentSize.width - _scrollView.bounds.size.width + _scrollView.contentInset.right;
|
|
offset = CGPointMake(fmax(offsetX, 0), 0);
|
|
} else {
|
|
CGFloat offsetY = _scrollView.contentSize.height - _scrollView.bounds.size.height + _scrollView.contentInset.bottom;
|
|
offset = CGPointMake(0, fmax(offsetY, 0));
|
|
}
|
|
if (!CGPointEqualToPoint(_scrollView.contentOffset, offset)) {
|
|
// Ensure at least one scroll event will fire
|
|
_allowNextScrollNoMatterWhat = YES;
|
|
[_scrollView setContentOffset:offset animated:animated];
|
|
}
|
|
}
|
|
|
|
- (void)zoomToRect:(CGRect)rect animated:(BOOL)animated
|
|
{
|
|
[_scrollView zoomToRect:rect animated:animated];
|
|
}
|
|
|
|
- (void)refreshContentInset
|
|
{
|
|
[RCTView autoAdjustInsetsForView:self withScrollView:_scrollView updateOffset:YES];
|
|
}
|
|
|
|
#pragma mark - ScrollView delegate
|
|
|
|
#define RCT_SEND_SCROLL_EVENT(_eventName, _userData) \
|
|
{ \
|
|
NSString *eventName = NSStringFromSelector(@selector(_eventName)); \
|
|
[self sendScrollEventWithName:eventName scrollView:_scrollView userData:_userData]; \
|
|
}
|
|
|
|
#define RCT_FORWARD_SCROLL_EVENT(call) \
|
|
for (NSObject<UIScrollViewDelegate> * scrollViewListener in _scrollListeners) { \
|
|
if ([scrollViewListener respondsToSelector:_cmd]) { \
|
|
[scrollViewListener call]; \
|
|
} \
|
|
}
|
|
|
|
#define RCT_SCROLL_EVENT_HANDLER(delegateMethod, eventName) \
|
|
-(void)delegateMethod : (UIScrollView *)scrollView \
|
|
{ \
|
|
RCT_SEND_SCROLL_EVENT(eventName, nil); \
|
|
RCT_FORWARD_SCROLL_EVENT(delegateMethod : scrollView); \
|
|
}
|
|
|
|
RCT_SCROLL_EVENT_HANDLER(scrollViewWillBeginDecelerating, onMomentumScrollBegin)
|
|
RCT_SCROLL_EVENT_HANDLER(scrollViewDidZoom, onScroll)
|
|
RCT_SCROLL_EVENT_HANDLER(scrollViewDidScrollToTop, onScrollToTop)
|
|
|
|
- (void)addScrollListener:(NSObject<UIScrollViewDelegate> *)scrollListener
|
|
{
|
|
[_scrollListeners addObject:scrollListener];
|
|
}
|
|
|
|
- (void)removeScrollListener:(NSObject<UIScrollViewDelegate> *)scrollListener
|
|
{
|
|
[_scrollListeners removeObject:scrollListener];
|
|
}
|
|
|
|
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
|
|
{
|
|
NSTimeInterval now = CACurrentMediaTime();
|
|
[self updateClippedSubviews];
|
|
/**
|
|
* TODO: this logic looks wrong, and it may be because it is. Currently, if _scrollEventThrottle
|
|
* is set to zero (the default), the "didScroll" event is only sent once per scroll, instead of repeatedly
|
|
* while scrolling as expected. However, if you "fix" that bug, ScrollView will generate repeated
|
|
* warnings, and behave strangely (ListView works fine however), so don't fix it unless you fix that too!
|
|
*
|
|
* We limit the delta to 17ms so that small throttles intended to enable 60fps updates will not
|
|
* inadvertently filter out any scroll events.
|
|
*/
|
|
if (_allowNextScrollNoMatterWhat ||
|
|
(_scrollEventThrottle > 0 && _scrollEventThrottle < MAX(0.017, now - _lastScrollDispatchTime))) {
|
|
RCT_SEND_SCROLL_EVENT(onScroll, nil);
|
|
// Update dispatch time
|
|
_lastScrollDispatchTime = now;
|
|
_allowNextScrollNoMatterWhat = NO;
|
|
}
|
|
RCT_FORWARD_SCROLL_EVENT(scrollViewDidScroll : scrollView);
|
|
}
|
|
|
|
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
|
|
{
|
|
_allowNextScrollNoMatterWhat = YES; // Ensure next scroll event is recorded, regardless of throttle
|
|
RCT_SEND_SCROLL_EVENT(onScrollBeginDrag, nil);
|
|
RCT_FORWARD_SCROLL_EVENT(scrollViewWillBeginDragging : scrollView);
|
|
}
|
|
|
|
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView
|
|
withVelocity:(CGPoint)velocity
|
|
targetContentOffset:(inout CGPoint *)targetContentOffset
|
|
{
|
|
if (self.snapToOffsets) {
|
|
// An alternative to enablePaging and snapToInterval which allows setting custom
|
|
// stopping points that don't have to be the same distance apart. Often seen in
|
|
// apps which feature horizonally scrolling items. snapToInterval does not enforce
|
|
// scrolling one interval at a time but guarantees that the scroll will stop at
|
|
// a snap offset point.
|
|
|
|
// Find which axis to snap
|
|
BOOL isHorizontal = [self isHorizontal:scrollView];
|
|
CGFloat velocityAlongAxis = isHorizontal ? velocity.x : velocity.y;
|
|
CGFloat offsetAlongAxis = isHorizontal ? _scrollView.contentOffset.x : _scrollView.contentOffset.y;
|
|
|
|
// Calculate maximum content offset
|
|
CGSize viewportSize = [self _calculateViewportSize];
|
|
CGFloat maximumOffset = isHorizontal ? MAX(0, _scrollView.contentSize.width - viewportSize.width)
|
|
: MAX(0, _scrollView.contentSize.height - viewportSize.height);
|
|
|
|
// Calculate the snap offsets adjacent to the initial offset target
|
|
CGFloat targetOffset = isHorizontal ? targetContentOffset->x : targetContentOffset->y;
|
|
CGFloat smallerOffset = 0.0;
|
|
CGFloat largerOffset = maximumOffset;
|
|
|
|
for (unsigned long i = 0; i < self.snapToOffsets.count; i++) {
|
|
CGFloat offset = [[self.snapToOffsets objectAtIndex:i] floatValue];
|
|
|
|
if (offset <= targetOffset) {
|
|
if (targetOffset - offset < targetOffset - smallerOffset) {
|
|
smallerOffset = offset;
|
|
}
|
|
}
|
|
|
|
if (offset >= targetOffset) {
|
|
if (offset - targetOffset < largerOffset - targetOffset) {
|
|
largerOffset = offset;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Calculate the nearest offset
|
|
CGFloat nearestOffset = targetOffset - smallerOffset < largerOffset - targetOffset ? smallerOffset : largerOffset;
|
|
|
|
CGFloat firstOffset = [[self.snapToOffsets firstObject] floatValue];
|
|
CGFloat lastOffset = [[self.snapToOffsets lastObject] floatValue];
|
|
|
|
// if scrolling after the last snap offset and snapping to the
|
|
// end of the list is disabled, then we allow free scrolling
|
|
if (!self.snapToEnd && targetOffset >= lastOffset) {
|
|
if (offsetAlongAxis >= lastOffset) {
|
|
// free scrolling
|
|
} else {
|
|
// snap to end
|
|
targetOffset = lastOffset;
|
|
}
|
|
} else if (!self.snapToStart && targetOffset <= firstOffset) {
|
|
if (offsetAlongAxis <= firstOffset) {
|
|
// free scrolling
|
|
} else {
|
|
// snap to beginning
|
|
targetOffset = firstOffset;
|
|
}
|
|
} else if (velocityAlongAxis > 0.0) {
|
|
targetOffset = largerOffset;
|
|
} else if (velocityAlongAxis < 0.0) {
|
|
targetOffset = smallerOffset;
|
|
} else {
|
|
targetOffset = nearestOffset;
|
|
}
|
|
|
|
// Make sure the new offset isn't out of bounds
|
|
targetOffset = MIN(MAX(0, targetOffset), maximumOffset);
|
|
|
|
// Set new targetContentOffset
|
|
if (isHorizontal) {
|
|
targetContentOffset->x = targetOffset;
|
|
} else {
|
|
targetContentOffset->y = targetOffset;
|
|
}
|
|
} else if (self.snapToInterval) {
|
|
// An alternative to enablePaging which allows setting custom stopping intervals,
|
|
// smaller than a full page size. Often seen in apps which feature horizonally
|
|
// scrolling items. snapToInterval does not enforce scrolling one interval at a time
|
|
// but guarantees that the scroll will stop at an interval point.
|
|
CGFloat snapToIntervalF = (CGFloat)self.snapToInterval;
|
|
|
|
// Find which axis to snap
|
|
BOOL isHorizontal = [self isHorizontal:scrollView];
|
|
|
|
// What is the current offset?
|
|
CGFloat velocityAlongAxis = isHorizontal ? velocity.x : velocity.y;
|
|
CGFloat targetContentOffsetAlongAxis = targetContentOffset->y;
|
|
if (isHorizontal) {
|
|
// Use current scroll offset to determine the next index to snap to when momentum disabled
|
|
targetContentOffsetAlongAxis = self.disableIntervalMomentum ? scrollView.contentOffset.x : targetContentOffset->x;
|
|
} else {
|
|
targetContentOffsetAlongAxis = self.disableIntervalMomentum ? scrollView.contentOffset.y : targetContentOffset->y;
|
|
}
|
|
|
|
// Offset based on desired alignment
|
|
CGFloat frameLength = isHorizontal ? self.frame.size.width : self.frame.size.height;
|
|
CGFloat alignmentOffset = 0.0f;
|
|
if ([self.snapToAlignment isEqualToString:@"center"]) {
|
|
alignmentOffset = (frameLength * 0.5f) + (snapToIntervalF * 0.5f);
|
|
} else if ([self.snapToAlignment isEqualToString:@"end"]) {
|
|
alignmentOffset = frameLength;
|
|
}
|
|
|
|
// Pick snap point based on direction and proximity
|
|
CGFloat fractionalIndex = (targetContentOffsetAlongAxis + alignmentOffset) / snapToIntervalF;
|
|
|
|
NSInteger snapIndex = velocityAlongAxis > 0.0 ? ceil(fractionalIndex)
|
|
: velocityAlongAxis < 0.0 ? floor(fractionalIndex)
|
|
: round(fractionalIndex);
|
|
CGFloat newTargetContentOffset = (snapIndex * snapToIntervalF) - alignmentOffset;
|
|
|
|
// Set new targetContentOffset
|
|
if (isHorizontal) {
|
|
targetContentOffset->x = newTargetContentOffset;
|
|
} else {
|
|
targetContentOffset->y = newTargetContentOffset;
|
|
}
|
|
}
|
|
|
|
NSDictionary *userData = @{
|
|
@"velocity" : @{@"x" : @(velocity.x), @"y" : @(velocity.y)},
|
|
@"targetContentOffset" : @{@"x" : @(targetContentOffset->x), @"y" : @(targetContentOffset->y)}
|
|
};
|
|
RCT_SEND_SCROLL_EVENT(onScrollEndDrag, userData);
|
|
RCT_FORWARD_SCROLL_EVENT(scrollViewWillEndDragging
|
|
: scrollView withVelocity
|
|
: velocity targetContentOffset
|
|
: targetContentOffset);
|
|
}
|
|
|
|
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
|
|
{
|
|
RCT_FORWARD_SCROLL_EVENT(scrollViewDidEndDragging : scrollView willDecelerate : decelerate);
|
|
}
|
|
|
|
- (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view
|
|
{
|
|
RCT_SEND_SCROLL_EVENT(onScrollBeginDrag, nil);
|
|
RCT_FORWARD_SCROLL_EVENT(scrollViewWillBeginZooming : scrollView withView : view);
|
|
}
|
|
|
|
- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale
|
|
{
|
|
RCT_SEND_SCROLL_EVENT(onScrollEndDrag, nil);
|
|
RCT_FORWARD_SCROLL_EVENT(scrollViewDidEndZooming : scrollView withView : view atScale : scale);
|
|
}
|
|
|
|
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
|
|
{
|
|
// Fire a final scroll event
|
|
_allowNextScrollNoMatterWhat = YES;
|
|
[self scrollViewDidScroll:scrollView];
|
|
|
|
// Fire the end deceleration event
|
|
RCT_SEND_SCROLL_EVENT(onMomentumScrollEnd, nil);
|
|
RCT_FORWARD_SCROLL_EVENT(scrollViewDidEndDecelerating : scrollView);
|
|
}
|
|
|
|
- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView
|
|
{
|
|
// Fire a final scroll event
|
|
_allowNextScrollNoMatterWhat = YES;
|
|
[self scrollViewDidScroll:scrollView];
|
|
|
|
// Fire the end deceleration event
|
|
RCT_SEND_SCROLL_EVENT(onMomentumScrollEnd, nil);
|
|
RCT_FORWARD_SCROLL_EVENT(scrollViewDidEndScrollingAnimation : scrollView);
|
|
}
|
|
|
|
- (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView
|
|
{
|
|
for (NSObject<UIScrollViewDelegate> *scrollListener in _scrollListeners) {
|
|
if ([scrollListener respondsToSelector:_cmd] && ![scrollListener scrollViewShouldScrollToTop:scrollView]) {
|
|
return NO;
|
|
}
|
|
}
|
|
|
|
if (self.inverted) {
|
|
[self scrollToEnd:YES];
|
|
return NO;
|
|
}
|
|
|
|
return YES;
|
|
}
|
|
|
|
- (UIView *)viewForZoomingInScrollView:(__unused UIScrollView *)scrollView
|
|
{
|
|
return _contentView;
|
|
}
|
|
|
|
- (CGSize)_calculateViewportSize
|
|
{
|
|
CGSize viewportSize = self.bounds.size;
|
|
if (_automaticallyAdjustContentInsets) {
|
|
UIEdgeInsets contentInsets = RCTContentInsets(self);
|
|
viewportSize = CGSizeMake(
|
|
self.bounds.size.width - contentInsets.left - contentInsets.right,
|
|
self.bounds.size.height - contentInsets.top - contentInsets.bottom);
|
|
}
|
|
return viewportSize;
|
|
}
|
|
|
|
- (CGSize)contentSize
|
|
{
|
|
return _contentView.frame.size;
|
|
}
|
|
|
|
- (void)updateContentSizeIfNeeded
|
|
{
|
|
CGSize contentSize = self.contentSize;
|
|
if (!CGSizeEqualToSize(_scrollView.contentSize, contentSize)) {
|
|
_scrollView.contentSize = contentSize;
|
|
}
|
|
}
|
|
|
|
// maintainVisibleContentPosition is used to allow seamless loading of content from both ends of
|
|
// the scrollview without the visible content jumping in position.
|
|
- (void)setMaintainVisibleContentPosition:(NSDictionary *)maintainVisibleContentPosition
|
|
{
|
|
if (maintainVisibleContentPosition != nil && _maintainVisibleContentPosition == nil) {
|
|
[_eventDispatcher.bridge.uiManager.observerCoordinator addObserver:self];
|
|
} else if (maintainVisibleContentPosition == nil && _maintainVisibleContentPosition != nil) {
|
|
[_eventDispatcher.bridge.uiManager.observerCoordinator removeObserver:self];
|
|
}
|
|
_maintainVisibleContentPosition = maintainVisibleContentPosition;
|
|
}
|
|
|
|
#pragma mark - RCTUIManagerObserver
|
|
|
|
- (void)uiManagerWillPerformMounting:(RCTUIManager *)manager
|
|
{
|
|
RCTAssertUIManagerQueue();
|
|
|
|
[manager prependUIBlock:^(
|
|
__unused RCTUIManager *uiManager, __unused NSDictionary<NSNumber *, UIView *> *viewRegistry) {
|
|
BOOL horz = [self isHorizontal:self->_scrollView];
|
|
NSUInteger minIdx = [self->_maintainVisibleContentPosition[@"minIndexForVisible"] integerValue];
|
|
for (NSUInteger ii = minIdx; ii < self->_contentView.subviews.count; ++ii) {
|
|
// Find the first entirely visible view. This must be done after we update the content offset
|
|
// or it will tend to grab rows that were made visible by the shift in position
|
|
UIView *subview = self->_contentView.subviews[ii];
|
|
BOOL hasNewView = NO;
|
|
if (horz) {
|
|
CGFloat leftInset = self.inverted ? self->_scrollView.contentInset.right : self->_scrollView.contentInset.left;
|
|
CGFloat x = self->_scrollView.contentOffset.x + leftInset;
|
|
hasNewView = subview.frame.origin.x > x;
|
|
} else {
|
|
CGFloat bottomInset =
|
|
self.inverted ? self->_scrollView.contentInset.top : self->_scrollView.contentInset.bottom;
|
|
CGFloat y = self->_scrollView.contentOffset.y + bottomInset;
|
|
hasNewView = subview.frame.origin.y > y;
|
|
}
|
|
if (hasNewView || ii == self->_contentView.subviews.count - 1) {
|
|
self->_prevFirstVisibleFrame = subview.frame;
|
|
self->_firstVisibleView = subview;
|
|
break;
|
|
}
|
|
}
|
|
}];
|
|
[manager addUIBlock:^(__unused RCTUIManager *uiManager, __unused NSDictionary<NSNumber *, UIView *> *viewRegistry) {
|
|
if (self->_maintainVisibleContentPosition == nil) {
|
|
return; // The prop might have changed in the previous UIBlocks, so need to abort here.
|
|
}
|
|
NSNumber *autoscrollThreshold = self->_maintainVisibleContentPosition[@"autoscrollToTopThreshold"];
|
|
// TODO: detect and handle/ignore re-ordering
|
|
if ([self isHorizontal:self->_scrollView]) {
|
|
CGFloat deltaX = self->_firstVisibleView.frame.origin.x - self->_prevFirstVisibleFrame.origin.x;
|
|
if (ABS(deltaX) > 0.1) {
|
|
CGFloat leftInset = self.inverted ? self->_scrollView.contentInset.right : self->_scrollView.contentInset.left;
|
|
CGFloat x = self->_scrollView.contentOffset.x + leftInset;
|
|
self->_scrollView.contentOffset =
|
|
CGPointMake(self->_scrollView.contentOffset.x + deltaX, self->_scrollView.contentOffset.y);
|
|
if (autoscrollThreshold != nil) {
|
|
// If the offset WAS within the threshold of the start, animate to the start.
|
|
if (x - deltaX <= [autoscrollThreshold integerValue]) {
|
|
[self scrollToOffset:CGPointMake(-leftInset, self->_scrollView.contentOffset.y) animated:YES];
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
CGRect newFrame = self->_firstVisibleView.frame;
|
|
CGFloat deltaY = newFrame.origin.y - self->_prevFirstVisibleFrame.origin.y;
|
|
if (ABS(deltaY) > 0.1) {
|
|
CGFloat bottomInset =
|
|
self.inverted ? self->_scrollView.contentInset.top : self->_scrollView.contentInset.bottom;
|
|
CGFloat y = self->_scrollView.contentOffset.y + bottomInset;
|
|
self->_scrollView.contentOffset =
|
|
CGPointMake(self->_scrollView.contentOffset.x, self->_scrollView.contentOffset.y + deltaY);
|
|
if (autoscrollThreshold != nil) {
|
|
// If the offset WAS within the threshold of the start, animate to the start.
|
|
if (y - deltaY <= [autoscrollThreshold integerValue]) {
|
|
[self scrollToOffset:CGPointMake(self->_scrollView.contentOffset.x, -bottomInset) animated:YES];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}];
|
|
}
|
|
|
|
// Note: setting several properties of UIScrollView has the effect of
|
|
// resetting its contentOffset to {0, 0}. To prevent this, we generate
|
|
// setters here that will record the contentOffset beforehand, and
|
|
// restore it after the property has been set.
|
|
|
|
#define RCT_SET_AND_PRESERVE_OFFSET(setter, getter, type) \
|
|
-(void)setter : (type)value \
|
|
{ \
|
|
CGPoint contentOffset = _scrollView.contentOffset; \
|
|
[_scrollView setter:value]; \
|
|
_scrollView.contentOffset = contentOffset; \
|
|
} \
|
|
-(type)getter \
|
|
{ \
|
|
return [_scrollView getter]; \
|
|
}
|
|
|
|
RCT_SET_AND_PRESERVE_OFFSET(setAlwaysBounceHorizontal, alwaysBounceHorizontal, BOOL)
|
|
RCT_SET_AND_PRESERVE_OFFSET(setAlwaysBounceVertical, alwaysBounceVertical, BOOL)
|
|
RCT_SET_AND_PRESERVE_OFFSET(setBounces, bounces, BOOL)
|
|
RCT_SET_AND_PRESERVE_OFFSET(setBouncesZoom, bouncesZoom, BOOL)
|
|
RCT_SET_AND_PRESERVE_OFFSET(setCanCancelContentTouches, canCancelContentTouches, BOOL)
|
|
RCT_SET_AND_PRESERVE_OFFSET(setDecelerationRate, decelerationRate, CGFloat)
|
|
RCT_SET_AND_PRESERVE_OFFSET(setDirectionalLockEnabled, isDirectionalLockEnabled, BOOL)
|
|
RCT_SET_AND_PRESERVE_OFFSET(setIndicatorStyle, indicatorStyle, UIScrollViewIndicatorStyle)
|
|
RCT_SET_AND_PRESERVE_OFFSET(setKeyboardDismissMode, keyboardDismissMode, UIScrollViewKeyboardDismissMode)
|
|
RCT_SET_AND_PRESERVE_OFFSET(setMaximumZoomScale, maximumZoomScale, CGFloat)
|
|
RCT_SET_AND_PRESERVE_OFFSET(setMinimumZoomScale, minimumZoomScale, CGFloat)
|
|
RCT_SET_AND_PRESERVE_OFFSET(setScrollEnabled, isScrollEnabled, BOOL)
|
|
RCT_SET_AND_PRESERVE_OFFSET(setPagingEnabled, isPagingEnabled, BOOL)
|
|
RCT_SET_AND_PRESERVE_OFFSET(setScrollsToTop, scrollsToTop, BOOL)
|
|
RCT_SET_AND_PRESERVE_OFFSET(setShowsHorizontalScrollIndicator, showsHorizontalScrollIndicator, BOOL)
|
|
RCT_SET_AND_PRESERVE_OFFSET(setShowsVerticalScrollIndicator, showsVerticalScrollIndicator, BOOL)
|
|
RCT_SET_AND_PRESERVE_OFFSET(setZoomScale, zoomScale, CGFloat);
|
|
RCT_SET_AND_PRESERVE_OFFSET(setScrollIndicatorInsets, scrollIndicatorInsets, UIEdgeInsets);
|
|
|
|
#if defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 130000 /* __IPHONE_13_0 */
|
|
- (void)setAutomaticallyAdjustsScrollIndicatorInsets:(BOOL)automaticallyAdjusts API_AVAILABLE(ios(13.0))
|
|
{
|
|
// `automaticallyAdjustsScrollIndicatorInsets` is available since iOS 13.
|
|
if ([_scrollView respondsToSelector:@selector(setAutomaticallyAdjustsScrollIndicatorInsets:)]) {
|
|
if (@available(iOS 13.0, *)) {
|
|
_scrollView.automaticallyAdjustsScrollIndicatorInsets = automaticallyAdjusts;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
- (void)setContentInsetAdjustmentBehavior:(UIScrollViewContentInsetAdjustmentBehavior)behavior
|
|
{
|
|
CGPoint contentOffset = _scrollView.contentOffset;
|
|
_scrollView.contentInsetAdjustmentBehavior = behavior;
|
|
_scrollView.contentOffset = contentOffset;
|
|
}
|
|
|
|
- (void)sendScrollEventWithName:(NSString *)eventName
|
|
scrollView:(UIScrollView *)scrollView
|
|
userData:(NSDictionary *)userData
|
|
{
|
|
if (![_lastEmittedEventName isEqualToString:eventName]) {
|
|
_coalescingKey++;
|
|
_lastEmittedEventName = [eventName copy];
|
|
}
|
|
RCTScrollEvent *scrollEvent = [[RCTScrollEvent alloc] initWithEventName:eventName
|
|
reactTag:self.reactTag
|
|
scrollViewContentOffset:scrollView.contentOffset
|
|
scrollViewContentInset:scrollView.contentInset
|
|
scrollViewContentSize:scrollView.contentSize
|
|
scrollViewFrame:scrollView.frame
|
|
scrollViewZoomScale:scrollView.zoomScale
|
|
userData:userData
|
|
coalescingKey:_coalescingKey];
|
|
[_eventDispatcher sendEvent:scrollEvent];
|
|
}
|
|
|
|
@end
|
|
|
|
void RCTSendFakeScrollEvent(id<RCTEventDispatcherProtocol> eventDispatcher, NSNumber *reactTag)
|
|
{
|
|
// Use the selector here in case the onScroll block property is ever renamed
|
|
NSString *eventName = NSStringFromSelector(@selector(onScroll));
|
|
RCTScrollEvent *fakeScrollEvent = [[RCTScrollEvent alloc] initWithEventName:eventName
|
|
reactTag:reactTag
|
|
scrollViewContentOffset:CGPointZero
|
|
scrollViewContentInset:UIEdgeInsetsZero
|
|
scrollViewContentSize:CGSizeZero
|
|
scrollViewFrame:CGRectZero
|
|
scrollViewZoomScale:0
|
|
userData:nil
|
|
coalescingKey:0];
|
|
[eventDispatcher sendEvent:fakeScrollEvent];
|
|
}
|