136 lines
4.0 KiB
Objective-C
136 lines
4.0 KiB
Objective-C
// Copyright 2004-present Facebook. All Rights Reserved.
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#import "RCTView.h"
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#import "RCTAutoInsetsProtocol.h"
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#import "RCTConvert.h"
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#import "RCTLog.h"
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static NSString *RCTRecursiveAccessibilityLabel(UIView *view)
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{
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NSMutableString *str = [NSMutableString stringWithString:@""];
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for (UIView *subview in view.subviews) {
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NSString *label = [subview accessibilityLabel];
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if (label) {
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[str appendString:@" "];
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[str appendString:label];
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} else {
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[str appendString:RCTRecursiveAccessibilityLabel(subview)];
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}
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}
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return str;
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}
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@implementation RCTView
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- (id)initWithFrame:(CGRect)frame
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{
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self = [super initWithFrame:frame];
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if (self) {
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_pointerEvents = RCTPointerEventsUnspecified;
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}
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return self;
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}
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- (NSString *)accessibilityLabel
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{
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if (self.overrideAccessibilityLabel) {
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return self.overrideAccessibilityLabel;
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}
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return RCTRecursiveAccessibilityLabel(self);
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}
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- (void)setPointerEvents:(RCTPointerEvents)pointerEvents
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{
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_pointerEvents = pointerEvents;
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self.userInteractionEnabled = (pointerEvents != RCTPointerEventsNone);
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if (pointerEvents == RCTPointerEventsBoxNone) {
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self.accessibilityViewIsModal = NO; // TODO: find out what this is for
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}
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}
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- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
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{
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switch (_pointerEvents) {
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case RCTPointerEventsNone:
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return nil;
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case RCTPointerEventsUnspecified:
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return [super hitTest:point withEvent:event];
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case RCTPointerEventsBoxOnly:
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return [super hitTest:point withEvent:event] ? self: nil;
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case RCTPointerEventsBoxNone:
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for (UIView *subview in [self.subviews reverseObjectEnumerator]) {
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if (!subview.isHidden && subview.isUserInteractionEnabled && subview.alpha > 0) {
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CGPoint convertedPoint = [subview convertPoint:point fromView:self];
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UIView *subviewHitTestView = [subview hitTest:convertedPoint withEvent:event];
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if (subviewHitTestView != nil) {
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return subviewHitTestView;
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}
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}
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}
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return nil;
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default:
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RCTLogError(@"Invalid pointer-events specified %zd on %@", _pointerEvents, self);
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return [super hitTest:point withEvent:event];
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}
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}
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#pragma mark - Statics for dealing with layoutGuides
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+ (void)autoAdjustInsetsForView:(UIView<RCTAutoInsetsProtocol> *)parentView
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withScrollView:(UIScrollView *)scrollView
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updateOffset:(BOOL)updateOffset
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{
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UIEdgeInsets baseInset = parentView.contentInset;
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CGFloat previousInsetTop = scrollView.contentInset.top;
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CGPoint contentOffset = scrollView.contentOffset;
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if (parentView.automaticallyAdjustContentInsets) {
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UIEdgeInsets autoInset = [self contentInsetsForView:parentView];
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baseInset.top += autoInset.top;
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baseInset.bottom += autoInset.bottom;
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baseInset.left += autoInset.left;
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baseInset.right += autoInset.right;
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}
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[scrollView setContentInset:baseInset];
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[scrollView setScrollIndicatorInsets:baseInset];
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if (updateOffset) {
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// If we're adjusting the top inset, then let's also adjust the contentOffset so that the view
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// elements above the top guide do not cover the content.
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// This is generally only needed when your views are initially laid out, for
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// manual changes to contentOffset, you can optionally disable this step
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CGFloat currentInsetTop = scrollView.contentInset.top;
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if (currentInsetTop != previousInsetTop) {
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contentOffset.y -= (currentInsetTop - previousInsetTop);
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scrollView.contentOffset = contentOffset;
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}
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}
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}
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+ (UIViewController *)backingViewControllerForView:(UIView *)view
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{
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id responder = [view nextResponder];
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if ([responder isKindOfClass:[UIViewController class]]) {
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return responder;
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}
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return nil;
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}
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+ (UIEdgeInsets)contentInsetsForView:(UIView *)view
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{
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while (view) {
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UIViewController *controller = [self backingViewControllerForView:view];
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if (controller) {
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return (UIEdgeInsets){
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controller.topLayoutGuide.length, 0,
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controller.bottomLayoutGuide.length, 0
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};
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}
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view = view.superview;
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}
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return UIEdgeInsetsZero;
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}
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@end
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