This app provides monitoring and information features for the common freifunk user and the technical stuff of a freifunk community.
Code base is taken from a TUM Practical Course project and added here to see if Freifunk Altdorf can use it.
https://www.freifunk-altdorf.de
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1075 lines
39 KiB
1075 lines
39 KiB
/** |
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* Copyright (c) 2015-present, Facebook, Inc. |
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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 "RCTEventDispatcher.h" |
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#import "RCTLog.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 "UIView+Private.h" |
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#import "UIView+React.h" |
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#if !TARGET_OS_TV |
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#import "RCTRefreshControl.h" |
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#endif |
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@interface RCTScrollEvent : NSObject <RCTEvent> |
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- (instancetype)initWithEventName:(NSString *)eventName |
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reactTag:(NSNumber *)reactTag |
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scrollViewContentOffset:(CGPoint)scrollViewContentOffset |
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scrollViewContentInset:(UIEdgeInsets)scrollViewContentInset |
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scrollViewContentSize:(CGSize)scrollViewContentSize |
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scrollViewFrame:(CGRect)scrollViewFrame |
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scrollViewZoomScale:(CGFloat)scrollViewZoomScale |
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userData:(NSDictionary *)userData |
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coalescingKey:(uint16_t)coalescingKey NS_DESIGNATED_INITIALIZER; |
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@end |
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@implementation RCTScrollEvent |
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{ |
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CGPoint _scrollViewContentOffset; |
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UIEdgeInsets _scrollViewContentInset; |
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CGSize _scrollViewContentSize; |
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CGRect _scrollViewFrame; |
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CGFloat _scrollViewZoomScale; |
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NSDictionary *_userData; |
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uint16_t _coalescingKey; |
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} |
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@synthesize viewTag = _viewTag; |
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@synthesize eventName = _eventName; |
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- (instancetype)initWithEventName:(NSString *)eventName |
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reactTag:(NSNumber *)reactTag |
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scrollViewContentOffset:(CGPoint)scrollViewContentOffset |
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scrollViewContentInset:(UIEdgeInsets)scrollViewContentInset |
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scrollViewContentSize:(CGSize)scrollViewContentSize |
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scrollViewFrame:(CGRect)scrollViewFrame |
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scrollViewZoomScale:(CGFloat)scrollViewZoomScale |
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userData:(NSDictionary *)userData |
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coalescingKey:(uint16_t)coalescingKey |
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{ |
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RCTAssertParam(reactTag); |
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if ((self = [super init])) { |
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_eventName = [eventName copy]; |
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_viewTag = reactTag; |
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_scrollViewContentOffset = scrollViewContentOffset; |
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_scrollViewContentInset = scrollViewContentInset; |
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_scrollViewContentSize = scrollViewContentSize; |
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_scrollViewFrame = scrollViewFrame; |
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_scrollViewZoomScale = scrollViewZoomScale; |
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_userData = userData; |
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_coalescingKey = coalescingKey; |
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} |
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return self; |
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} |
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RCT_NOT_IMPLEMENTED(- (instancetype)init) |
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- (uint16_t)coalescingKey |
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{ |
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return _coalescingKey; |
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} |
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- (NSDictionary *)body |
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{ |
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NSDictionary *body = @{ |
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@"contentOffset": @{ |
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@"x": @(_scrollViewContentOffset.x), |
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@"y": @(_scrollViewContentOffset.y) |
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}, |
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@"contentInset": @{ |
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@"top": @(_scrollViewContentInset.top), |
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@"left": @(_scrollViewContentInset.left), |
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@"bottom": @(_scrollViewContentInset.bottom), |
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@"right": @(_scrollViewContentInset.right) |
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}, |
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@"contentSize": @{ |
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@"width": @(_scrollViewContentSize.width), |
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@"height": @(_scrollViewContentSize.height) |
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}, |
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@"layoutMeasurement": @{ |
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@"width": @(_scrollViewFrame.size.width), |
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@"height": @(_scrollViewFrame.size.height) |
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}, |
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@"zoomScale": @(_scrollViewZoomScale ?: 1), |
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}; |
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if (_userData) { |
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NSMutableDictionary *mutableBody = [body mutableCopy]; |
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[mutableBody addEntriesFromDictionary:_userData]; |
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body = mutableBody; |
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} |
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return body; |
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} |
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- (BOOL)canCoalesce |
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{ |
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return YES; |
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} |
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- (RCTScrollEvent *)coalesceWithEvent:(RCTScrollEvent *)newEvent |
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{ |
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NSArray<NSDictionary *> *updatedChildFrames = [_userData[@"updatedChildFrames"] arrayByAddingObjectsFromArray:newEvent->_userData[@"updatedChildFrames"]]; |
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if (updatedChildFrames) { |
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NSMutableDictionary *userData = [newEvent->_userData mutableCopy]; |
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userData[@"updatedChildFrames"] = updatedChildFrames; |
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newEvent->_userData = userData; |
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} |
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return newEvent; |
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} |
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+ (NSString *)moduleDotMethod |
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{ |
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return @"RCTEventEmitter.receiveEvent"; |
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} |
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- (NSArray *)arguments |
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{ |
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return @[self.viewTag, RCTNormalizeInputEventName(self.eventName), [self body]]; |
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} |
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@end |
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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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#if !TARGET_OS_TV |
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@property (nonatomic, strong) RCTRefreshControl *rctRefreshControl; |
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@property (nonatomic, assign) BOOL pinchGestureEnabled; |
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#endif |
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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 intentionaly 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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#if !TARGET_OS_TV |
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_pinchGestureEnabled = YES; |
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#endif |
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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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//TODO: shouldn't this call super if _shouldDisableScrollInteraction returns NO? |
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return ![self _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) { |
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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 = contentOffset; |
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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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// Make sure offset don't exceed bounds. This could happen on screen rotation. |
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CGSize boundsSize = self.bounds.size; |
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self.contentOffset = CGPointMake( |
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MAX(-contentInset.left, MIN(contentSize.width - boundsSize.width + contentInset.right, originalOffset.x)), |
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MAX(-contentInset.top, MIN(contentSize.height - boundsSize.height + contentInset.bottom, originalOffset.y))); |
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} |
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} |
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#if !TARGET_OS_TV |
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- (void)setRctRefreshControl:(RCTRefreshControl *)refreshControl |
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{ |
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if (_rctRefreshControl) { |
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[_rctRefreshControl removeFromSuperview]; |
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} |
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_rctRefreshControl = refreshControl; |
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[self addSubview:_rctRefreshControl]; |
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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 overriden when the view loads. |
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self.pinchGestureRecognizer.enabled = _pinchGestureEnabled; |
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} |
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#endif //TARGET_OS_TV |
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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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{ |
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RCTEventDispatcher *_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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- (instancetype)initWithEventDispatcher:(RCTEventDispatcher *)eventDispatcher |
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{ |
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RCTAssertParam(eventDispatcher); |
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if ((self = [super initWithFrame:CGRectZero])) { |
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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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#if defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 110000 /* __IPHONE_11_0 */ |
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// `contentInsetAdjustmentBehavior` is only available since iOS 11. |
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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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if ([_scrollView respondsToSelector:@selector(setContentInsetAdjustmentBehavior:)]) { |
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_scrollView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever; |
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} |
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#endif |
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_automaticallyAdjustContentInsets = YES; |
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_DEPRECATED_sendUpdatedChildFrames = NO; |
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_contentInset = UIEdgeInsetsZero; |
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_contentSize = CGSizeZero; |
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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(UIView *view, UIUserInterfaceLayoutDirection layoutDirection) { |
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view.transform = |
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layoutDirection == UIUserInterfaceLayoutDirectionLeftToRight ? |
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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 !TARGET_OS_TV |
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if ([view isKindOfClass:[RCTRefreshControl class]]) { |
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[_scrollView setRctRefreshControl:(RCTRefreshControl *)view]; |
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} else |
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#endif |
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{ |
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RCTAssert(_contentView == nil, @"RCTScrollView may only contain a single subview"); |
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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 !TARGET_OS_TV |
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if ([subview isKindOfClass:[RCTRefreshControl class]]) { |
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[_scrollView setRctRefreshControl:nil]; |
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} else |
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#endif |
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{ |
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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 updateContentOffsetIfNeeded]; |
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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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} |
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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 |
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// Adjust the refresh control frame if the scrollview layout changes. |
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RCTRefreshControl *refreshControl = _scrollView.rctRefreshControl; |
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if (refreshControl && refreshControl.refreshing) { |
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refreshControl.frame = (CGRect){_scrollView.contentOffset, {_scrollView.frame.size.width, refreshControl.frame.size.height}}; |
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} |
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#endif |
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[self updateClippedSubviews]; |
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} |
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- (void)updateClippedSubviews |
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{ |
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// Find a suitable view to use for clipping |
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UIView *clipView = [self react_findClipView]; |
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if (!clipView) { |
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return; |
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} |
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static const CGFloat leeway = 1.0; |
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const CGSize contentSize = _scrollView.contentSize; |
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const CGRect bounds = _scrollView.bounds; |
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const BOOL scrollsHorizontally = contentSize.width > bounds.size.width; |
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const BOOL scrollsVertically = contentSize.height > bounds.size.height; |
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const BOOL shouldClipAgain = |
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CGRectIsNull(_lastClippedToRect) || |
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!CGRectEqualToRect(_lastClippedToRect, bounds) || |
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(scrollsHorizontally && (bounds.size.width < leeway || fabs(_lastClippedToRect.origin.x - bounds.origin.x) >= leeway)) || |
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(scrollsVertically && (bounds.size.height < leeway || fabs(_lastClippedToRect.origin.y - bounds.origin.y) >= leeway)); |
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if (shouldClipAgain) { |
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const CGRect clipRect = CGRectInset(clipView.bounds, -leeway, -leeway); |
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[self react_updateClippedSubviewsWithClipRect:clipRect relativeToView:clipView]; |
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_lastClippedToRect = bounds; |
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} |
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} |
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- (void)setContentInset:(UIEdgeInsets)contentInset |
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{ |
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if (UIEdgeInsetsEqualToEdgeInsets(contentInset, _contentInset)) { |
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return; |
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} |
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CGPoint contentOffset = _scrollView.contentOffset; |
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_contentInset = contentInset; |
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[RCTView autoAdjustInsetsForView:self |
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withScrollView:_scrollView |
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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)) { |
|
// Ensure at least one scroll event will fire |
|
_allowNextScrollNoMatterWhat = YES; |
|
[_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) |
|
|
|
- (void)addScrollListener:(NSObject<UIScrollViewDelegate> *)scrollListener |
|
{ |
|
[_scrollListeners addObject:scrollListener]; |
|
} |
|
|
|
- (void)removeScrollListener:(NSObject<UIScrollViewDelegate> *)scrollListener |
|
{ |
|
[_scrollListeners removeObject:scrollListener]; |
|
} |
|
|
|
- (void)scrollViewDidScroll:(UIScrollView *)scrollView |
|
{ |
|
[self updateClippedSubviews]; |
|
NSTimeInterval now = CACurrentMediaTime(); |
|
/** |
|
* 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! |
|
*/ |
|
if (_allowNextScrollNoMatterWhat || |
|
(_scrollEventThrottle > 0 && _scrollEventThrottle < (now - _lastScrollDispatchTime))) { |
|
|
|
if (_DEPRECATED_sendUpdatedChildFrames) { |
|
// Calculate changed frames |
|
RCT_SEND_SCROLL_EVENT(onScroll, (@{@"updatedChildFrames": [self calculateChildFramesData]})); |
|
} else { |
|
RCT_SEND_SCROLL_EVENT(onScroll, nil); |
|
} |
|
|
|
// Update dispatch time |
|
_lastScrollDispatchTime = now; |
|
_allowNextScrollNoMatterWhat = NO; |
|
} |
|
RCT_FORWARD_SCROLL_EVENT(scrollViewDidScroll:scrollView); |
|
} |
|
|
|
- (NSArray<NSDictionary *> *)calculateChildFramesData |
|
{ |
|
NSMutableArray<NSDictionary *> *updatedChildFrames = [NSMutableArray new]; |
|
[[_contentView reactSubviews] enumerateObjectsUsingBlock: |
|
^(UIView *subview, NSUInteger idx, __unused BOOL *stop) { |
|
|
|
// Check if new or changed |
|
CGRect newFrame = subview.frame; |
|
BOOL frameChanged = NO; |
|
if (self->_cachedChildFrames.count <= idx) { |
|
frameChanged = YES; |
|
[self->_cachedChildFrames addObject:[NSValue valueWithCGRect:newFrame]]; |
|
} else if (!CGRectEqualToRect(newFrame, [self->_cachedChildFrames[idx] CGRectValue])) { |
|
frameChanged = YES; |
|
self->_cachedChildFrames[idx] = [NSValue valueWithCGRect:newFrame]; |
|
} |
|
|
|
// Create JS frame object |
|
if (frameChanged) { |
|
[updatedChildFrames addObject: @{ |
|
@"index": @(idx), |
|
@"x": @(newFrame.origin.x), |
|
@"y": @(newFrame.origin.y), |
|
@"width": @(newFrame.size.width), |
|
@"height": @(newFrame.size.height), |
|
}]; |
|
} |
|
}]; |
|
|
|
return updatedChildFrames; |
|
} |
|
|
|
- (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 |
|
{ |
|
// 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. |
|
if (self.snapToInterval) { |
|
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 = isHorizontal ? targetContentOffset->x : 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; |
|
} |
|
} |
|
return YES; |
|
} |
|
|
|
- (UIView *)viewForZoomingInScrollView:(__unused UIScrollView *)scrollView |
|
{ |
|
return _contentView; |
|
} |
|
|
|
#pragma mark - Setters |
|
|
|
- (CGSize)_calculateViewportSize |
|
{ |
|
CGSize viewportSize = self.bounds.size; |
|
if (_automaticallyAdjustContentInsets) { |
|
UIEdgeInsets contentInsets = [RCTView contentInsetsForView:self]; |
|
viewportSize = CGSizeMake(self.bounds.size.width - contentInsets.left - contentInsets.right, |
|
self.bounds.size.height - contentInsets.top - contentInsets.bottom); |
|
} |
|
return viewportSize; |
|
} |
|
|
|
- (CGPoint)calculateOffsetForContentSize:(CGSize)newContentSize |
|
{ |
|
CGPoint oldOffset = _scrollView.contentOffset; |
|
CGPoint newOffset = oldOffset; |
|
|
|
CGSize oldContentSize = _scrollView.contentSize; |
|
CGSize viewportSize = [self _calculateViewportSize]; |
|
|
|
BOOL fitsinViewportY = oldContentSize.height <= viewportSize.height && newContentSize.height <= viewportSize.height; |
|
if (newContentSize.height < oldContentSize.height && !fitsinViewportY) { |
|
CGFloat offsetHeight = oldOffset.y + viewportSize.height; |
|
if (oldOffset.y < 0) { |
|
// overscrolled on top, leave offset alone |
|
} else if (offsetHeight > oldContentSize.height) { |
|
// overscrolled on the bottom, preserve overscroll amount |
|
newOffset.y = MAX(0, oldOffset.y - (oldContentSize.height - newContentSize.height)); |
|
} else if (offsetHeight > newContentSize.height) { |
|
// offset falls outside of bounds, scroll back to end of list |
|
newOffset.y = MAX(0, newContentSize.height - viewportSize.height); |
|
} |
|
} |
|
|
|
BOOL fitsinViewportX = oldContentSize.width <= viewportSize.width && newContentSize.width <= viewportSize.width; |
|
if (newContentSize.width < oldContentSize.width && !fitsinViewportX) { |
|
CGFloat offsetHeight = oldOffset.x + viewportSize.width; |
|
if (oldOffset.x < 0) { |
|
// overscrolled at the beginning, leave offset alone |
|
} else if (offsetHeight > oldContentSize.width && newContentSize.width > viewportSize.width) { |
|
// overscrolled at the end, preserve overscroll amount as much as possible |
|
newOffset.x = MAX(0, oldOffset.x - (oldContentSize.width - newContentSize.width)); |
|
} else if (offsetHeight > newContentSize.width) { |
|
// offset falls outside of bounds, scroll back to end |
|
newOffset.x = MAX(0, newContentSize.width - viewportSize.width); |
|
} |
|
} |
|
|
|
// all other cases, offset doesn't change |
|
return newOffset; |
|
} |
|
|
|
/** |
|
* Once you set the `contentSize`, to a nonzero value, it is assumed to be |
|
* managed by you, and we'll never automatically compute the size for you, |
|
* unless you manually reset it back to {0, 0} |
|
*/ |
|
- (CGSize)contentSize |
|
{ |
|
if (!CGSizeEqualToSize(_contentSize, CGSizeZero)) { |
|
return _contentSize; |
|
} |
|
|
|
return _contentView.frame.size; |
|
} |
|
|
|
- (void)updateContentOffsetIfNeeded |
|
{ |
|
CGSize contentSize = self.contentSize; |
|
if (!CGSizeEqualToSize(_scrollView.contentSize, contentSize)) { |
|
// When contentSize is set manually, ScrollView internals will reset |
|
// contentOffset to {0, 0}. Since we potentially set contentSize whenever |
|
// anything in the ScrollView updates, we workaround this issue by manually |
|
// adjusting contentOffset whenever this happens |
|
CGPoint newOffset = [self calculateOffsetForContentSize:contentSize]; |
|
_scrollView.contentSize = contentSize; |
|
_scrollView.contentOffset = newOffset; |
|
} |
|
} |
|
|
|
// 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:^(RCTUIManager *uiManager, 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]; |
|
if ((horz |
|
? subview.frame.origin.x >= self->_scrollView.contentOffset.x |
|
: subview.frame.origin.y >= self->_scrollView.contentOffset.y) || |
|
ii == self->_contentView.subviews.count - 1) { |
|
self->_prevFirstVisibleFrame = subview.frame; |
|
self->_firstVisibleView = subview; |
|
break; |
|
} |
|
} |
|
}]; |
|
[manager addUIBlock:^(RCTUIManager *uiManager, 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) { |
|
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 (self->_scrollView.contentOffset.x - deltaX <= [autoscrollThreshold integerValue]) { |
|
[self scrollToOffset:CGPointMake(0, 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) { |
|
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 (self->_scrollView.contentOffset.y - deltaY <= [autoscrollThreshold integerValue]) { |
|
[self scrollToOffset:CGPointMake(self->_scrollView.contentOffset.x, 0) 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) |
|
#if !TARGET_OS_TV |
|
RCT_SET_AND_PRESERVE_OFFSET(setPagingEnabled, isPagingEnabled, BOOL) |
|
RCT_SET_AND_PRESERVE_OFFSET(setScrollsToTop, scrollsToTop, BOOL) |
|
#endif |
|
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 >= 110000 /* __IPHONE_11_0 */ |
|
- (void)setContentInsetAdjustmentBehavior:(UIScrollViewContentInsetAdjustmentBehavior)behavior |
|
{ |
|
// `contentInsetAdjustmentBehavior` is available since iOS 11. |
|
if ([_scrollView respondsToSelector:@selector(setContentInsetAdjustmentBehavior:)]) { |
|
CGPoint contentOffset = _scrollView.contentOffset; |
|
_scrollView.contentInsetAdjustmentBehavior = behavior; |
|
_scrollView.contentOffset = contentOffset; |
|
} |
|
} |
|
#endif |
|
|
|
- (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 |
|
|
|
@implementation RCTEventDispatcher (RCTScrollView) |
|
|
|
- (void)sendFakeScrollEvent:(NSNumber *)reactTag |
|
{ |
|
// Use the selector here in case the onScroll block property is ever renamed |
|
NSString *eventName = NSStringFromSelector(@selector(onScroll)); |
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RCTScrollEvent *fakeScrollEvent = [[RCTScrollEvent alloc] initWithEventName:eventName |
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reactTag:reactTag |
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scrollViewContentOffset:CGPointZero |
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scrollViewContentInset:UIEdgeInsetsZero |
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scrollViewContentSize:CGSizeZero |
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scrollViewFrame:CGRectZero |
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scrollViewZoomScale:0 |
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userData:nil |
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coalescingKey:0]; |
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[self sendEvent:fakeScrollEvent]; |
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} |
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|
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@end
|
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