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RCTView.m
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RCTView.m
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/*
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
#import "RCTView.h"
#import "RCTAutoInsetsProtocol.h"
#import "RCTBorderDrawing.h"
#import "RCTI18nUtil.h"
#import "RCTLog.h"
#import "RCTViewUtils.h"
#import "UIView+React.h"
UIAccessibilityTraits const SwitchAccessibilityTrait = 0x20000000000001;
@implementation UIView (RCTViewUnmounting)
- (void)react_remountAllSubviews
{
// Normal views don't support unmounting, so all
// this does is forward message to our subviews,
// in case any of those do support it
for (UIView *subview in self.subviews) {
[subview react_remountAllSubviews];
}
}
- (void)react_updateClippedSubviewsWithClipRect:(CGRect)clipRect relativeToView:(UIView *)clipView
{
// Even though we don't support subview unmounting
// we do support clipsToBounds, so if that's enabled
// we'll update the clipping
if (self.clipsToBounds && self.subviews.count > 0) {
clipRect = [clipView convertRect:clipRect toView:self];
clipRect = CGRectIntersection(clipRect, self.bounds);
clipView = self;
}
// Normal views don't support unmounting, so all
// this does is forward message to our subviews,
// in case any of those do support it
for (UIView *subview in self.subviews) {
[subview react_updateClippedSubviewsWithClipRect:clipRect relativeToView:clipView];
}
}
- (UIView *)react_findClipView
{
UIView *testView = self;
UIView *clipView = nil;
CGRect clipRect = self.bounds;
// We will only look for a clipping view up the view hierarchy until we hit the root view.
while (testView) {
if (testView.clipsToBounds) {
if (clipView) {
CGRect testRect = [clipView convertRect:clipRect toView:testView];
if (!CGRectContainsRect(testView.bounds, testRect)) {
clipView = testView;
clipRect = CGRectIntersection(testView.bounds, testRect);
}
} else {
clipView = testView;
clipRect = [self convertRect:self.bounds toView:clipView];
}
}
if ([testView isReactRootView]) {
break;
}
testView = testView.superview;
}
return clipView ?: self.window;
}
@end
static NSString *RCTRecursiveAccessibilityLabel(UIView *view)
{
NSMutableString *str = [NSMutableString stringWithString:@""];
for (UIView *subview in view.subviews) {
NSString *label = subview.accessibilityLabel;
if (!label) {
label = RCTRecursiveAccessibilityLabel(subview);
}
if (label && label.length > 0) {
if (str.length > 0) {
[str appendString:@" "];
}
[str appendString:label];
}
}
return str.length == 0 ? nil : str;
}
@implementation RCTView {
UIColor *_backgroundColor;
NSMutableDictionary<NSString *, NSDictionary *> *accessibilityActionsNameMap;
NSMutableDictionary<NSString *, NSDictionary *> *accessibilityActionsLabelMap;
}
- (instancetype)initWithFrame:(CGRect)frame
{
if ((self = [super initWithFrame:frame])) {
_borderWidth = -1;
_borderTopWidth = -1;
_borderRightWidth = -1;
_borderBottomWidth = -1;
_borderLeftWidth = -1;
_borderStartWidth = -1;
_borderEndWidth = -1;
_borderTopLeftRadius = -1;
_borderTopRightRadius = -1;
_borderTopStartRadius = -1;
_borderTopEndRadius = -1;
_borderBottomLeftRadius = -1;
_borderBottomRightRadius = -1;
_borderBottomStartRadius = -1;
_borderBottomEndRadius = -1;
_borderStyle = RCTBorderStyleSolid;
_hitTestEdgeInsets = UIEdgeInsetsZero;
_backgroundColor = super.backgroundColor;
}
return self;
}
RCT_NOT_IMPLEMENTED(-(instancetype)initWithCoder : unused)
- (void)setReactLayoutDirection:(UIUserInterfaceLayoutDirection)layoutDirection
{
if (_reactLayoutDirection != layoutDirection) {
_reactLayoutDirection = layoutDirection;
[self.layer setNeedsDisplay];
}
if ([self respondsToSelector:@selector(setSemanticContentAttribute:)]) {
self.semanticContentAttribute = layoutDirection == UIUserInterfaceLayoutDirectionLeftToRight
? UISemanticContentAttributeForceLeftToRight
: UISemanticContentAttributeForceRightToLeft;
}
}
#pragma mark - Hit Testing
- (void)setPointerEvents:(RCTPointerEvents)pointerEvents
{
_pointerEvents = pointerEvents;
self.userInteractionEnabled = (pointerEvents != RCTPointerEventsNone);
if (pointerEvents == RCTPointerEventsBoxNone) {
self.accessibilityViewIsModal = NO;
}
}
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
{
BOOL canReceiveTouchEvents = ([self isUserInteractionEnabled] && ![self isHidden]);
if (!canReceiveTouchEvents) {
return nil;
}
// `hitSubview` is the topmost subview which was hit. The hit point can
// be outside the bounds of `view` (e.g., if -clipsToBounds is NO).
UIView *hitSubview = nil;
BOOL isPointInside = [self pointInside:point withEvent:event];
BOOL needsHitSubview = !(_pointerEvents == RCTPointerEventsNone || _pointerEvents == RCTPointerEventsBoxOnly);
if (needsHitSubview && (![self clipsToBounds] || isPointInside)) {
// Take z-index into account when calculating the touch target.
NSArray<UIView *> *sortedSubviews = [self reactZIndexSortedSubviews];
// The default behaviour of UIKit is that if a view does not contain a point,
// then no subviews will be returned from hit testing, even if they contain
// the hit point. By doing hit testing directly on the subviews, we bypass
// the strict containment policy (i.e., UIKit guarantees that every ancestor
// of the hit view will return YES from -pointInside:withEvent:). See:
// - https://developer.apple.com/library/ios/qa/qa2013/qa1812.html
for (UIView *subview in [sortedSubviews reverseObjectEnumerator]) {
CGPoint convertedPoint = [subview convertPoint:point fromView:self];
hitSubview = [subview hitTest:convertedPoint withEvent:event];
if (hitSubview != nil) {
break;
}
}
}
UIView *hitView = (isPointInside ? self : nil);
switch (_pointerEvents) {
case RCTPointerEventsNone:
return nil;
case RCTPointerEventsUnspecified:
return hitSubview ?: hitView;
case RCTPointerEventsBoxOnly:
return hitView;
case RCTPointerEventsBoxNone:
return hitSubview;
default:
RCTLogError(@"Invalid pointer-events specified %lld on %@", (long long)_pointerEvents, self);
return hitSubview ?: hitView;
}
}
- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event
{
if (UIEdgeInsetsEqualToEdgeInsets(self.hitTestEdgeInsets, UIEdgeInsetsZero)) {
return [super pointInside:point withEvent:event];
}
CGRect hitFrame = UIEdgeInsetsInsetRect(self.bounds, self.hitTestEdgeInsets);
return CGRectContainsPoint(hitFrame, point);
}
#pragma mark - Accessibility
- (NSString *)accessibilityLabel
{
NSString *label = super.accessibilityLabel;
if (label) {
return label;
}
return RCTRecursiveAccessibilityLabel(self);
}
- (NSArray<UIAccessibilityCustomAction *> *)accessibilityCustomActions
{
if (!self.accessibilityActions.count) {
return nil;
}
accessibilityActionsNameMap = [NSMutableDictionary new];
accessibilityActionsLabelMap = [NSMutableDictionary new];
NSMutableArray *actions = [NSMutableArray array];
for (NSDictionary *action in self.accessibilityActions) {
if (action[@"name"]) {
accessibilityActionsNameMap[action[@"name"]] = action;
}
if (action[@"label"]) {
accessibilityActionsLabelMap[action[@"label"]] = action;
[actions addObject:[[UIAccessibilityCustomAction alloc]
initWithName:action[@"label"]
target:self
selector:@selector(didActivateAccessibilityCustomAction:)]];
}
}
return [actions copy];
}
- (BOOL)didActivateAccessibilityCustomAction:(UIAccessibilityCustomAction *)action
{
if (!_onAccessibilityAction || !accessibilityActionsLabelMap) {
return NO;
}
// iOS defines the name as the localized label, so use our map to convert this back to the non-localized action name
// when passing to JS. This allows for standard action names across platforms.
NSDictionary *actionObject = accessibilityActionsLabelMap[action.name];
if (actionObject) {
_onAccessibilityAction(@{@"actionName" : actionObject[@"name"], @"actionTarget" : self.reactTag});
}
return YES;
}
- (NSString *)accessibilityValue
{
static dispatch_once_t onceToken;
static NSDictionary<NSString *, NSString *> *rolesAndStatesDescription = nil;
dispatch_once(&onceToken, ^{
NSString *bundlePath = [[NSBundle mainBundle] pathForResource:@"AccessibilityResources" ofType:@"bundle"];
NSBundle *bundle = [NSBundle bundleWithPath:bundlePath];
if (bundle) {
NSURL *url = [bundle URLForResource:@"Localizable" withExtension:@"strings"];
rolesAndStatesDescription = [NSDictionary dictionaryWithContentsOfURL:url error:nil];
}
if (rolesAndStatesDescription == nil) {
// Falling back to hardcoded English list.
NSLog(@"Cannot load localized accessibility strings.");
rolesAndStatesDescription = @{
@"alert" : @"alert",
@"checkbox" : @"checkbox",
@"combobox" : @"combo box",
@"menu" : @"menu",
@"menubar" : @"menu bar",
@"menuitem" : @"menu item",
@"progressbar" : @"progress bar",
@"radio" : @"radio button",
@"radiogroup" : @"radio group",
@"scrollbar" : @"scroll bar",
@"spinbutton" : @"spin button",
@"switch" : @"switch",
@"tab" : @"tab",
@"tablist" : @"tab list",
@"timer" : @"timer",
@"toolbar" : @"tool bar",
@"checked" : @"checked",
@"unchecked" : @"not checked",
@"busy" : @"busy",
@"expanded" : @"expanded",
@"collapsed" : @"collapsed",
@"mixed" : @"mixed",
};
}
});
// Handle Switch.
if ((self.accessibilityTraits & SwitchAccessibilityTrait) == SwitchAccessibilityTrait) {
for (NSString *state in self.accessibilityState) {
id val = self.accessibilityState[state];
if (!val) {
continue;
}
if ([state isEqualToString:@"checked"] && [val isKindOfClass:[NSNumber class]]) {
return [val boolValue] ? @"1" : @"0";
}
}
}
NSMutableArray *valueComponents = [NSMutableArray new];
NSString *roleDescription = self.accessibilityRole ? rolesAndStatesDescription[self.accessibilityRole] : nil;
if (roleDescription) {
[valueComponents addObject:roleDescription];
}
// Handle states which haven't already been handled in RCTViewManager.
for (NSString *state in self.accessibilityState) {
id val = self.accessibilityState[state];
if (!val) {
continue;
}
if ([state isEqualToString:@"checked"]) {
if ([val isKindOfClass:[NSNumber class]]) {
[valueComponents addObject:rolesAndStatesDescription[[val boolValue] ? @"checked" : @"unchecked"]];
} else if ([val isKindOfClass:[NSString class]] && [val isEqualToString:@"mixed"]) {
[valueComponents addObject:rolesAndStatesDescription[@"mixed"]];
}
}
if ([state isEqualToString:@"expanded"] && [val isKindOfClass:[NSNumber class]]) {
[valueComponents addObject:rolesAndStatesDescription[[val boolValue] ? @"expanded" : @"collapsed"]];
}
if ([state isEqualToString:@"busy"] && [val isKindOfClass:[NSNumber class]] && [val boolValue]) {
[valueComponents addObject:rolesAndStatesDescription[@"busy"]];
}
}
// Handle accessibilityValue.
if (self.accessibilityValueInternal) {
id min = self.accessibilityValueInternal[@"min"];
id now = self.accessibilityValueInternal[@"now"];
id max = self.accessibilityValueInternal[@"max"];
id text = self.accessibilityValueInternal[@"text"];
if (text && [text isKindOfClass:[NSString class]]) {
[valueComponents addObject:text];
} else if (
[min isKindOfClass:[NSNumber class]] && [now isKindOfClass:[NSNumber class]] &&
[max isKindOfClass:[NSNumber class]] && ([min intValue] < [max intValue]) &&
([min intValue] <= [now intValue] && [now intValue] <= [max intValue])) {
int val = ([now intValue] * 100) / ([max intValue] - [min intValue]);
[valueComponents addObject:[NSString stringWithFormat:@"%d percent", val]];
}
}
if (valueComponents.count > 0) {
return [valueComponents componentsJoinedByString:@", "];
}
return nil;
}
- (UIView *)reactAccessibilityElement
{
return self;
}
- (BOOL)isAccessibilityElement
{
if (self.reactAccessibilityElement == self) {
return [super isAccessibilityElement];
}
return NO;
}
- (BOOL)performAccessibilityAction:(NSString *)name
{
if (_onAccessibilityAction && accessibilityActionsNameMap[name]) {
_onAccessibilityAction(@{@"actionName" : name, @"actionTarget" : self.reactTag});
return YES;
}
return NO;
}
- (BOOL)accessibilityActivate
{
if ([self performAccessibilityAction:@"activate"]) {
return YES;
} else if (_onAccessibilityTap) {
_onAccessibilityTap(nil);
return YES;
} else {
return NO;
}
}
- (BOOL)accessibilityPerformMagicTap
{
if ([self performAccessibilityAction:@"magicTap"]) {
return YES;
} else if (_onMagicTap) {
_onMagicTap(nil);
return YES;
} else {
return NO;
}
}
- (BOOL)accessibilityPerformEscape
{
if ([self performAccessibilityAction:@"escape"]) {
return YES;
} else if (_onAccessibilityEscape) {
_onAccessibilityEscape(nil);
return YES;
} else {
return NO;
}
}
- (void)accessibilityIncrement
{
[self performAccessibilityAction:@"increment"];
}
- (void)accessibilityDecrement
{
[self performAccessibilityAction:@"decrement"];
}
- (NSString *)description
{
NSString *superDescription = super.description;
NSRange semicolonRange = [superDescription rangeOfString:@";"];
NSString *replacement = [NSString stringWithFormat:@"; reactTag: %@;", self.reactTag];
return [superDescription stringByReplacingCharactersInRange:semicolonRange withString:replacement];
}
#pragma mark - Statics for dealing with layoutGuides
+ (void)autoAdjustInsetsForView:(UIView<RCTAutoInsetsProtocol> *)parentView
withScrollView:(UIScrollView *)scrollView
updateOffset:(BOOL)updateOffset
{
UIEdgeInsets baseInset = parentView.contentInset;
CGFloat previousInsetTop = scrollView.contentInset.top;
CGPoint contentOffset = scrollView.contentOffset;
if (parentView.automaticallyAdjustContentInsets) {
UIEdgeInsets autoInset = RCTContentInsets(parentView);
baseInset.top += autoInset.top;
baseInset.bottom += autoInset.bottom;
baseInset.left += autoInset.left;
baseInset.right += autoInset.right;
}
scrollView.contentInset = baseInset;
scrollView.scrollIndicatorInsets = baseInset;
if (updateOffset) {
// If we're adjusting the top inset, then let's also adjust the contentOffset so that the view
// elements above the top guide do not cover the content.
// This is generally only needed when your views are initially laid out, for
// manual changes to contentOffset, you can optionally disable this step
CGFloat currentInsetTop = scrollView.contentInset.top;
if (currentInsetTop != previousInsetTop) {
contentOffset.y -= (currentInsetTop - previousInsetTop);
scrollView.contentOffset = contentOffset;
}
}
}
#pragma mark - View Unmounting
- (void)react_remountAllSubviews
{
if (_removeClippedSubviews) {
for (UIView *view in self.reactSubviews) {
if (view.superview != self) {
[self addSubview:view];
[view react_remountAllSubviews];
}
}
} else {
// If _removeClippedSubviews is false, we must already be showing all subviews
[super react_remountAllSubviews];
}
}
- (void)react_updateClippedSubviewsWithClipRect:(CGRect)clipRect relativeToView:(UIView *)clipView
{
// TODO (#5906496): for scrollviews (the primary use-case) we could
// optimize this by only doing a range check along the scroll axis,
// instead of comparing the whole frame
if (!_removeClippedSubviews) {
// Use default behavior if unmounting is disabled
return [super react_updateClippedSubviewsWithClipRect:clipRect relativeToView:clipView];
}
if (self.reactSubviews.count == 0) {
// Do nothing if we have no subviews
return;
}
if (CGSizeEqualToSize(self.bounds.size, CGSizeZero)) {
// Do nothing if layout hasn't happened yet
return;
}
// Convert clipping rect to local coordinates
clipRect = [clipView convertRect:clipRect toView:self];
clipRect = CGRectIntersection(clipRect, self.bounds);
clipView = self;
// Mount / unmount views
for (UIView *view in self.reactSubviews) {
if (!CGSizeEqualToSize(CGRectIntersection(clipRect, view.frame).size, CGSizeZero)) {
// View is at least partially visible, so remount it if unmounted
[self addSubview:view];
// Then test its subviews
if (CGRectContainsRect(clipRect, view.frame)) {
// View is fully visible, so remount all subviews
[view react_remountAllSubviews];
} else {
// View is partially visible, so update clipped subviews
[view react_updateClippedSubviewsWithClipRect:clipRect relativeToView:clipView];
}
} else if (view.superview) {
// View is completely outside the clipRect, so unmount it
[view removeFromSuperview];
}
}
}
- (void)setRemoveClippedSubviews:(BOOL)removeClippedSubviews
{
if (!removeClippedSubviews && _removeClippedSubviews) {
[self react_remountAllSubviews];
}
_removeClippedSubviews = removeClippedSubviews;
}
- (void)didUpdateReactSubviews
{
if (_removeClippedSubviews) {
[self updateClippedSubviews];
} else {
[super didUpdateReactSubviews];
}
}
- (void)updateClippedSubviews
{
// Find a suitable view to use for clipping
UIView *clipView = [self react_findClipView];
if (clipView) {
[self react_updateClippedSubviewsWithClipRect:clipView.bounds relativeToView:clipView];
}
}
- (void)layoutSubviews
{
// TODO (#5906496): this a nasty performance drain, but necessary
// to prevent gaps appearing when the loading spinner disappears.
// We might be able to fix this another way by triggering a call
// to updateClippedSubviews manually after loading
[super layoutSubviews];
if (_removeClippedSubviews) {
[self updateClippedSubviews];
}
}
- (void)traitCollectionDidChange:(UITraitCollection *)previousTraitCollection
{
[super traitCollectionDidChange:previousTraitCollection];
#if defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 130000
if (@available(iOS 13.0, *)) {
if ([self.traitCollection hasDifferentColorAppearanceComparedToTraitCollection:previousTraitCollection]) {
[self.layer setNeedsDisplay];
}
}
#endif
}
#pragma mark - Borders
- (UIColor *)backgroundColor
{
return _backgroundColor;
}
- (void)setBackgroundColor:(UIColor *)backgroundColor
{
if ([_backgroundColor isEqual:backgroundColor]) {
return;
}
_backgroundColor = backgroundColor;
[self.layer setNeedsDisplay];
}
static CGFloat RCTDefaultIfNegativeTo(CGFloat defaultValue, CGFloat x)
{
return x >= 0 ? x : defaultValue;
};
- (UIEdgeInsets)bordersAsInsets
{
const CGFloat borderWidth = MAX(0, _borderWidth);
const BOOL isRTL = _reactLayoutDirection == UIUserInterfaceLayoutDirectionRightToLeft;
if ([[RCTI18nUtil sharedInstance] doLeftAndRightSwapInRTL]) {
const CGFloat borderStartWidth = RCTDefaultIfNegativeTo(_borderLeftWidth, _borderStartWidth);
const CGFloat borderEndWidth = RCTDefaultIfNegativeTo(_borderRightWidth, _borderEndWidth);
const CGFloat directionAwareBorderLeftWidth = isRTL ? borderEndWidth : borderStartWidth;
const CGFloat directionAwareBorderRightWidth = isRTL ? borderStartWidth : borderEndWidth;
return (UIEdgeInsets){
RCTDefaultIfNegativeTo(borderWidth, _borderTopWidth),
RCTDefaultIfNegativeTo(borderWidth, directionAwareBorderLeftWidth),
RCTDefaultIfNegativeTo(borderWidth, _borderBottomWidth),
RCTDefaultIfNegativeTo(borderWidth, directionAwareBorderRightWidth),
};
}
const CGFloat directionAwareBorderLeftWidth = isRTL ? _borderEndWidth : _borderStartWidth;
const CGFloat directionAwareBorderRightWidth = isRTL ? _borderStartWidth : _borderEndWidth;
return (UIEdgeInsets){
RCTDefaultIfNegativeTo(borderWidth, _borderTopWidth),
RCTDefaultIfNegativeTo(borderWidth, RCTDefaultIfNegativeTo(_borderLeftWidth, directionAwareBorderLeftWidth)),
RCTDefaultIfNegativeTo(borderWidth, _borderBottomWidth),
RCTDefaultIfNegativeTo(borderWidth, RCTDefaultIfNegativeTo(_borderRightWidth, directionAwareBorderRightWidth)),
};
}
- (RCTCornerRadii)cornerRadii
{
const BOOL isRTL = _reactLayoutDirection == UIUserInterfaceLayoutDirectionRightToLeft;
const CGFloat radius = MAX(0, _borderRadius);
CGFloat topLeftRadius;
CGFloat topRightRadius;
CGFloat bottomLeftRadius;
CGFloat bottomRightRadius;
if ([[RCTI18nUtil sharedInstance] doLeftAndRightSwapInRTL]) {
const CGFloat topStartRadius = RCTDefaultIfNegativeTo(_borderTopLeftRadius, _borderTopStartRadius);
const CGFloat topEndRadius = RCTDefaultIfNegativeTo(_borderTopRightRadius, _borderTopEndRadius);
const CGFloat bottomStartRadius = RCTDefaultIfNegativeTo(_borderBottomLeftRadius, _borderBottomStartRadius);
const CGFloat bottomEndRadius = RCTDefaultIfNegativeTo(_borderBottomRightRadius, _borderBottomEndRadius);
const CGFloat directionAwareTopLeftRadius = isRTL ? topEndRadius : topStartRadius;
const CGFloat directionAwareTopRightRadius = isRTL ? topStartRadius : topEndRadius;
const CGFloat directionAwareBottomLeftRadius = isRTL ? bottomEndRadius : bottomStartRadius;
const CGFloat directionAwareBottomRightRadius = isRTL ? bottomStartRadius : bottomEndRadius;
topLeftRadius = RCTDefaultIfNegativeTo(radius, directionAwareTopLeftRadius);
topRightRadius = RCTDefaultIfNegativeTo(radius, directionAwareTopRightRadius);
bottomLeftRadius = RCTDefaultIfNegativeTo(radius, directionAwareBottomLeftRadius);
bottomRightRadius = RCTDefaultIfNegativeTo(radius, directionAwareBottomRightRadius);
} else {
const CGFloat directionAwareTopLeftRadius = isRTL ? _borderTopEndRadius : _borderTopStartRadius;
const CGFloat directionAwareTopRightRadius = isRTL ? _borderTopStartRadius : _borderTopEndRadius;
const CGFloat directionAwareBottomLeftRadius = isRTL ? _borderBottomEndRadius : _borderBottomStartRadius;
const CGFloat directionAwareBottomRightRadius = isRTL ? _borderBottomStartRadius : _borderBottomEndRadius;
topLeftRadius =
RCTDefaultIfNegativeTo(radius, RCTDefaultIfNegativeTo(_borderTopLeftRadius, directionAwareTopLeftRadius));
topRightRadius =
RCTDefaultIfNegativeTo(radius, RCTDefaultIfNegativeTo(_borderTopRightRadius, directionAwareTopRightRadius));
bottomLeftRadius =
RCTDefaultIfNegativeTo(radius, RCTDefaultIfNegativeTo(_borderBottomLeftRadius, directionAwareBottomLeftRadius));
bottomRightRadius = RCTDefaultIfNegativeTo(
radius, RCTDefaultIfNegativeTo(_borderBottomRightRadius, directionAwareBottomRightRadius));
}
// Get scale factors required to prevent radii from overlapping
const CGSize size = self.bounds.size;
const CGFloat topScaleFactor = RCTZeroIfNaN(MIN(1, size.width / (topLeftRadius + topRightRadius)));
const CGFloat bottomScaleFactor = RCTZeroIfNaN(MIN(1, size.width / (bottomLeftRadius + bottomRightRadius)));
const CGFloat rightScaleFactor = RCTZeroIfNaN(MIN(1, size.height / (topRightRadius + bottomRightRadius)));
const CGFloat leftScaleFactor = RCTZeroIfNaN(MIN(1, size.height / (topLeftRadius + bottomLeftRadius)));
// Return scaled radii
return (RCTCornerRadii){
topLeftRadius * MIN(topScaleFactor, leftScaleFactor),
topRightRadius * MIN(topScaleFactor, rightScaleFactor),
bottomLeftRadius * MIN(bottomScaleFactor, leftScaleFactor),
bottomRightRadius * MIN(bottomScaleFactor, rightScaleFactor),
};
}
- (RCTBorderColors)borderColors
{
const BOOL isRTL = _reactLayoutDirection == UIUserInterfaceLayoutDirectionRightToLeft;
if ([[RCTI18nUtil sharedInstance] doLeftAndRightSwapInRTL]) {
UIColor *borderStartColor = _borderStartColor ?: _borderLeftColor;
UIColor *borderEndColor = _borderEndColor ?: _borderRightColor;
UIColor *directionAwareBorderLeftColor = isRTL ? borderEndColor : borderStartColor;
UIColor *directionAwareBorderRightColor = isRTL ? borderStartColor : borderEndColor;
return (RCTBorderColors){
(_borderTopColor ?: _borderColor).CGColor,
(directionAwareBorderLeftColor ?: _borderColor).CGColor,
(_borderBottomColor ?: _borderColor).CGColor,
(directionAwareBorderRightColor ?: _borderColor).CGColor,
};
}
UIColor *directionAwareBorderLeftColor = isRTL ? _borderEndColor : _borderStartColor;
UIColor *directionAwareBorderRightColor = isRTL ? _borderStartColor : _borderEndColor;
return (RCTBorderColors){
(_borderTopColor ?: _borderColor).CGColor,
(directionAwareBorderLeftColor ?: _borderLeftColor ?: _borderColor).CGColor,
(_borderBottomColor ?: _borderColor).CGColor,
(directionAwareBorderRightColor ?: _borderRightColor ?: _borderColor).CGColor,
};
}
- (void)reactSetFrame:(CGRect)frame
{
// If frame is zero, or below the threshold where the border radii can
// be rendered as a stretchable image, we'll need to re-render.
// TODO: detect up-front if re-rendering is necessary
CGSize oldSize = self.bounds.size;
[super reactSetFrame:frame];
if (!CGSizeEqualToSize(self.bounds.size, oldSize)) {
[self.layer setNeedsDisplay];
}
}
- (void)displayLayer:(CALayer *)layer
{
if (CGSizeEqualToSize(layer.bounds.size, CGSizeZero)) {
return;
}
RCTUpdateShadowPathForView(self);
const RCTCornerRadii cornerRadii = [self cornerRadii];
const UIEdgeInsets borderInsets = [self bordersAsInsets];
const RCTBorderColors borderColors = [self borderColors];
BOOL useIOSBorderRendering = RCTCornerRadiiAreEqual(cornerRadii) && RCTBorderInsetsAreEqual(borderInsets) &&
RCTBorderColorsAreEqual(borderColors) && _borderStyle == RCTBorderStyleSolid &&
// iOS draws borders in front of the content whereas CSS draws them behind
// the content. For this reason, only use iOS border drawing when clipping
// or when the border is hidden.
(borderInsets.top == 0 || (borderColors.top && CGColorGetAlpha(borderColors.top) == 0) || self.clipsToBounds);
// iOS clips to the outside of the border, but CSS clips to the inside. To
// solve this, we'll need to add a container view inside the main view to
// correctly clip the subviews.
CGColorRef backgroundColor;
#if defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 130000
if (@available(iOS 13.0, *)) {
backgroundColor = [_backgroundColor resolvedColorWithTraitCollection:self.traitCollection].CGColor;
} else {
backgroundColor = _backgroundColor.CGColor;
}
#else
backgroundColor = _backgroundColor.CGColor;
#endif
if (useIOSBorderRendering) {
layer.cornerRadius = cornerRadii.topLeft;
layer.borderColor = borderColors.left;
layer.borderWidth = borderInsets.left;
layer.backgroundColor = backgroundColor;
layer.contents = nil;
layer.needsDisplayOnBoundsChange = NO;
layer.mask = nil;
return;
}
UIImage *image = RCTGetBorderImage(
_borderStyle, layer.bounds.size, cornerRadii, borderInsets, borderColors, backgroundColor, self.clipsToBounds);
layer.backgroundColor = NULL;
if (image == nil) {
layer.contents = nil;
layer.needsDisplayOnBoundsChange = NO;
return;
}
CGRect contentsCenter = ({
CGSize size = image.size;
UIEdgeInsets insets = image.capInsets;
CGRectMake(
insets.left / size.width, insets.top / size.height, (CGFloat)1.0 / size.width, (CGFloat)1.0 / size.height);
});
layer.contents = (id)image.CGImage;
layer.contentsScale = image.scale;
layer.needsDisplayOnBoundsChange = YES;
layer.magnificationFilter = kCAFilterNearest;
const BOOL isResizable = !UIEdgeInsetsEqualToEdgeInsets(image.capInsets, UIEdgeInsetsZero);
if (isResizable) {
layer.contentsCenter = contentsCenter;
} else {
layer.contentsCenter = CGRectMake(0.0, 0.0, 1.0, 1.0);
}
[self updateClippingForLayer:layer];
}
static BOOL RCTLayerHasShadow(CALayer *layer)
{
return layer.shadowOpacity * CGColorGetAlpha(layer.shadowColor) > 0;
}
static void RCTUpdateShadowPathForView(RCTView *view)
{
if (RCTLayerHasShadow(view.layer)) {
if (CGColorGetAlpha(view.backgroundColor.CGColor) > 0.999) {
// If view has a solid background color, calculate shadow path from border
const RCTCornerRadii cornerRadii = [view cornerRadii];
const RCTCornerInsets cornerInsets = RCTGetCornerInsets(cornerRadii, UIEdgeInsetsZero);
CGPathRef shadowPath = RCTPathCreateWithRoundedRect(view.bounds, cornerInsets, NULL);
view.layer.shadowPath = shadowPath;
CGPathRelease(shadowPath);
} else {
// Can't accurately calculate box shadow, so fall back to pixel-based shadow
view.layer.shadowPath = nil;
RCTLogAdvice(
@"View #%@ of type %@ has a shadow set but cannot calculate "
"shadow efficiently. Consider setting a background color to "
"fix this, or apply the shadow to a more specific component.",
view.reactTag,
[view class]);
}
}
}
- (void)updateClippingForLayer:(CALayer *)layer
{
CALayer *mask = nil;
CGFloat cornerRadius = 0;
if (self.clipsToBounds) {
const RCTCornerRadii cornerRadii = [self cornerRadii];
if (RCTCornerRadiiAreEqual(cornerRadii)) {
cornerRadius = cornerRadii.topLeft;
} else {
CAShapeLayer *shapeLayer = [CAShapeLayer layer];
CGPathRef path =
RCTPathCreateWithRoundedRect(self.bounds, RCTGetCornerInsets(cornerRadii, UIEdgeInsetsZero), NULL);
shapeLayer.path = path;
CGPathRelease(path);
mask = shapeLayer;
}
}
layer.cornerRadius = cornerRadius;
layer.mask = mask;
}
#pragma mark Border Color
#define setBorderColor(side) \
-(void)setBorder##side##Color : (UIColor *)color \
{ \
if ([_border##side##Color isEqual:color]) { \
return; \
} \
_border##side##Color = color; \
[self.layer setNeedsDisplay]; \
}
setBorderColor() setBorderColor(Top) setBorderColor(Right) setBorderColor(Bottom) setBorderColor(Left)
setBorderColor(Start) setBorderColor(End)
#pragma mark - Border Width
#define setBorderWidth(side) \
-(void)setBorder##side##Width : (CGFloat)width \
{ \
if (_border##side##Width == width) { \
return; \
} \
_border##side##Width = width; \
[self.layer setNeedsDisplay]; \
}
setBorderWidth() setBorderWidth(Top) setBorderWidth(Right) setBorderWidth(Bottom) setBorderWidth(Left)
setBorderWidth(Start) setBorderWidth(End)
#pragma mark - Border Radius
#define setBorderRadius(side) \
-(void)setBorder##side##Radius : (CGFloat)radius \
{ \
if (_border##side##Radius == radius) { \
return; \
} \
_border##side##Radius = radius; \
[self.layer setNeedsDisplay]; \
}
setBorderRadius() setBorderRadius(TopLeft) setBorderRadius(TopRight) setBorderRadius(TopStart)
setBorderRadius(TopEnd) setBorderRadius(BottomLeft) setBorderRadius(BottomRight)
setBorderRadius(BottomStart) setBorderRadius(BottomEnd)
#pragma mark - Border Style
#define setBorderStyle(side) \
-(void)setBorder##side##Style : (RCTBorderStyle)style \
{ \
if (_border##side##Style == style) { \
return; \
} \
_border##side##Style = style; \
[self.layer setNeedsDisplay]; \
}
setBorderStyle()
@end