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react-native/React/Views/RCTView.m

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/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
#import "RCTView.h"
#import "RCTAutoInsetsProtocol.h"
#import "RCTBorderDrawing.h"
#import "RCTConvert.h"
#import "RCTLog.h"
#import "RCTUtils.h"
#import "UIView+React.h"
@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) {
[str appendString:@" "];
[str appendString:label];
} else {
[str appendString:RCTRecursiveAccessibilityLabel(subview)];
}
}
return str;
}
@implementation RCTView
{
UIColor *_backgroundColor;
}
@synthesize reactZIndex = _reactZIndex;
- (instancetype)initWithFrame:(CGRect)frame
{
if ((self = [super initWithFrame:frame])) {
_borderWidth = -1;
_borderTopWidth = -1;
_borderRightWidth = -1;
_borderBottomWidth = -1;
_borderLeftWidth = -1;
_borderTopLeftRadius = -1;
_borderTopRightRadius = -1;
_borderBottomLeftRadius = -1;
_borderBottomRightRadius = -1;
_borderStyle = RCTBorderStyleSolid;
_hitTestEdgeInsets = UIEdgeInsetsZero;
_backgroundColor = super.backgroundColor;
}
return self;
}
RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:unused)
- (NSString *)accessibilityLabel
{
if (super.accessibilityLabel) {
return super.accessibilityLabel;
}
return RCTRecursiveAccessibilityLabel(self);
}
- (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)) {
// 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 [self.subviews 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 %zd on %@", _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);
}
- (BOOL)accessibilityActivate
{
if (_onAccessibilityTap) {
_onAccessibilityTap(nil);
return YES;
} else {
return NO;
}
}
- (BOOL)accessibilityPerformMagicTap
{
if (_onMagicTap) {
_onMagicTap(nil);
return YES;
} else {
return NO;
}
}
- (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 = [self contentInsetsForView: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;
}
}
}
+ (UIEdgeInsets)contentInsetsForView:(UIView *)view
{
while (view) {
UIViewController *controller = view.reactViewController;
if (controller) {
return (UIEdgeInsets){
controller.topLayoutGuide.length, 0,
controller.bottomLayoutGuide.length, 0
};
}
view = view.superview;
}
return UIEdgeInsetsZero;
}
#pragma mark - View unmounting
- (void)react_remountAllSubviews
{
if (_removeClippedSubviews) {
for (UIView *view in self.sortedReactSubviews) {
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.sortedReactSubviews) {
if (!CGRectIsEmpty(CGRectIntersection(clipRect, view.frame))) {
// 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];
}
}
#pragma mark - Borders
- (UIColor *)backgroundColor
{
return _backgroundColor;
}
- (void)setBackgroundColor:(UIColor *)backgroundColor
{
if ([_backgroundColor isEqual:backgroundColor]) {
return;
}
_backgroundColor = backgroundColor;
[self.layer setNeedsDisplay];
}
- (UIEdgeInsets)bordersAsInsets
{
const CGFloat borderWidth = MAX(0, _borderWidth);
return (UIEdgeInsets) {
_borderTopWidth >= 0 ? _borderTopWidth : borderWidth,
_borderLeftWidth >= 0 ? _borderLeftWidth : borderWidth,
_borderBottomWidth >= 0 ? _borderBottomWidth : borderWidth,
_borderRightWidth >= 0 ? _borderRightWidth : borderWidth,
};
}
- (RCTCornerRadii)cornerRadii
{
// Get corner radii
const CGFloat radius = MAX(0, _borderRadius);
const CGFloat topLeftRadius = _borderTopLeftRadius >= 0 ? _borderTopLeftRadius : radius;
const CGFloat topRightRadius = _borderTopRightRadius >= 0 ? _borderTopRightRadius : radius;
const CGFloat bottomLeftRadius = _borderBottomLeftRadius >= 0 ? _borderBottomLeftRadius : radius;
const CGFloat bottomRightRadius = _borderBottomRightRadius >= 0 ? _borderBottomRightRadius : radius;
// 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
{
return (RCTBorderColors){
_borderTopColor ?: _borderColor,
_borderLeftColor ?: _borderColor,
_borderBottomColor ?: _borderColor,
_borderRightColor ?: _borderColor,
};
}
- (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 =
!RCTRunningInTestEnvironment() &&
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 || 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.
if (useIOSBorderRendering) {
layer.cornerRadius = cornerRadii.topLeft;
layer.borderColor = borderColors.left;
layer.borderWidth = borderInsets.left;
layer.backgroundColor = _backgroundColor.CGColor;
layer.contents = nil;
layer.needsDisplayOnBoundsChange = NO;
layer.mask = nil;
return;
}
UIImage *image = RCTGetBorderImage(_borderStyle,
layer.bounds.size,
cornerRadii,
borderInsets,
borderColors,
_backgroundColor.CGColor,
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,
1.0 / size.width,
1.0 / size.height
);
});
if (RCTRunningInTestEnvironment()) {
const CGSize size = self.bounds.size;
UIGraphicsBeginImageContextWithOptions(size, NO, image.scale);
[image drawInRect:(CGRect){CGPointZero, size}];
image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
contentsCenter = CGRectMake(0, 0, 1, 1);
}
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;
}
- (void)reactSetInheritedBackgroundColor:(UIColor *)inheritedBackgroundColor
{
// Inherit background color if a shadow has been set, as an optimization
if (RCTLayerHasShadow(self.layer)) {
self.backgroundColor = inheritedBackgroundColor;
}
}
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;
RCTLogWarn(@"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:(CGColorRef)color \
{ \
if (CGColorEqualToColor(_border##side##Color, color)) { \
return; \
} \
CGColorRelease(_border##side##Color); \
_border##side##Color = CGColorRetain(color); \
[self.layer setNeedsDisplay]; \
}
setBorderColor()
setBorderColor(Top)
setBorderColor(Right)
setBorderColor(Bottom)
setBorderColor(Left)
#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)
#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(BottomLeft)
setBorderRadius(BottomRight)
#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()
- (void)dealloc
{
CGColorRelease(_borderColor);
CGColorRelease(_borderTopColor);
CGColorRelease(_borderRightColor);
CGColorRelease(_borderBottomColor);
CGColorRelease(_borderLeftColor);
}
@end
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