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react-native/React/Views/RCTShadowView.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 "RCTShadowView.h"
#import "RCTConvert.h"
#import "RCTLog.h"
#import "RCTUtils.h"
#import "UIView+React.h"
#import "UIView+Private.h"
typedef void (^RCTActionBlock)(RCTShadowView *shadowViewSelf, id value);
typedef void (^RCTResetActionBlock)(RCTShadowView *shadowViewSelf);
static NSString *const RCTBackgroundColorProp = @"backgroundColor";
typedef NS_ENUM(unsigned int, meta_prop_t) {
META_PROP_LEFT,
META_PROP_TOP,
META_PROP_RIGHT,
META_PROP_BOTTOM,
META_PROP_HORIZONTAL,
META_PROP_VERTICAL,
META_PROP_ALL,
META_PROP_COUNT,
};
@implementation RCTShadowView
{
RCTUpdateLifecycle _propagationLifecycle;
RCTUpdateLifecycle _textLifecycle;
NSDictionary *_lastParentProperties;
NSMutableArray<RCTShadowView *> *_reactSubviews;
BOOL _recomputePadding;
BOOL _recomputeMargin;
BOOL _recomputeBorder;
BOOL _didUpdateSubviews;
float _paddingMetaProps[META_PROP_COUNT];
float _marginMetaProps[META_PROP_COUNT];
float _borderMetaProps[META_PROP_COUNT];
}
@synthesize reactTag = _reactTag;
// css_node api
static void RCTPrint(void *context)
{
RCTShadowView *shadowView = (__bridge RCTShadowView *)context;
printf("%s(%zd), ", shadowView.viewName.UTF8String, shadowView.reactTag.integerValue);
}
static css_node_t *RCTGetChild(void *context, int i)
{
RCTShadowView *shadowView = (__bridge RCTShadowView *)context;
RCTShadowView *child = [shadowView reactSubviews][i];
return child->_cssNode;
}
static bool RCTIsDirty(void *context)
{
RCTShadowView *shadowView = (__bridge RCTShadowView *)context;
return [shadowView isLayoutDirty];
}
// Enforces precedence rules, e.g. marginLeft > marginHorizontal > margin.
static void RCTProcessMetaProps(const float metaProps[META_PROP_COUNT], float style[CSS_POSITION_COUNT]) {
style[CSS_LEFT] = !isUndefined(metaProps[META_PROP_LEFT]) ? metaProps[META_PROP_LEFT]
: !isUndefined(metaProps[META_PROP_HORIZONTAL]) ? metaProps[META_PROP_HORIZONTAL]
: !isUndefined(metaProps[META_PROP_ALL]) ? metaProps[META_PROP_ALL]
: 0;
style[CSS_RIGHT] = !isUndefined(metaProps[META_PROP_RIGHT]) ? metaProps[META_PROP_RIGHT]
: !isUndefined(metaProps[META_PROP_HORIZONTAL]) ? metaProps[META_PROP_HORIZONTAL]
: !isUndefined(metaProps[META_PROP_ALL]) ? metaProps[META_PROP_ALL]
: 0;
style[CSS_TOP] = !isUndefined(metaProps[META_PROP_TOP]) ? metaProps[META_PROP_TOP]
: !isUndefined(metaProps[META_PROP_VERTICAL]) ? metaProps[META_PROP_VERTICAL]
: !isUndefined(metaProps[META_PROP_ALL]) ? metaProps[META_PROP_ALL]
: 0;
style[CSS_BOTTOM] = !isUndefined(metaProps[META_PROP_BOTTOM]) ? metaProps[META_PROP_BOTTOM]
: !isUndefined(metaProps[META_PROP_VERTICAL]) ? metaProps[META_PROP_VERTICAL]
: !isUndefined(metaProps[META_PROP_ALL]) ? metaProps[META_PROP_ALL]
: 0;
}
- (void)fillCSSNode:(css_node_t *)node
{
node->children_count = (int)_reactSubviews.count;
}
// The absolute stuff is so that we can take into account our absolute position when rounding in order to
// snap to the pixel grid. For example, say you have the following structure:
//
// +--------+---------+--------+
// | |+-------+| |
// | || || |
// | |+-------+| |
// +--------+---------+--------+
//
// Say the screen width is 320 pts so the three big views will get the following x bounds from our layout system:
// {0, 106.667}, {106.667, 213.333}, {213.333, 320}
//
// Assuming screen scale is 2, these numbers must be rounded to the nearest 0.5 to fit the pixel grid:
// {0, 106.5}, {106.5, 213.5}, {213.5, 320}
// You'll notice that the three widths are 106.5, 107, 106.5.
//
// This is great for the parent views but it gets trickier when we consider rounding for the subview.
//
// When we go to round the bounds for the subview in the middle, it's relative bounds are {0, 106.667}
// which gets rounded to {0, 106.5}. This will cause the subview to be one pixel smaller than it should be.
// this is why we need to pass in the absolute position in order to do the rounding relative to the screen's
// grid rather than the view's grid.
//
// After passing in the absolutePosition of {106.667, y}, we do the following calculations:
// absoluteLeft = round(absolutePosition.x + viewPosition.left) = round(106.667 + 0) = 106.5
// absoluteRight = round(absolutePosition.x + viewPosition.left + viewSize.left) + round(106.667 + 0 + 106.667) = 213.5
// width = 213.5 - 106.5 = 107
// You'll notice that this is the same width we calculated for the parent view because we've taken its position into account.
- (void)applyLayoutNode:(css_node_t *)node
viewsWithNewFrame:(NSMutableSet<RCTShadowView *> *)viewsWithNewFrame
absolutePosition:(CGPoint)absolutePosition
{
if (!node->layout.should_update) {
return;
}
node->layout.should_update = false;
_layoutLifecycle = RCTUpdateLifecycleComputed;
CGPoint absoluteTopLeft = {
absolutePosition.x + node->layout.position[CSS_LEFT],
absolutePosition.y + node->layout.position[CSS_TOP]
};
CGPoint absoluteBottomRight = {
absolutePosition.x + node->layout.position[CSS_LEFT] + node->layout.dimensions[CSS_WIDTH],
absolutePosition.y + node->layout.position[CSS_TOP] + node->layout.dimensions[CSS_HEIGHT]
};
CGRect frame = {{
RCTRoundPixelValue(node->layout.position[CSS_LEFT]),
RCTRoundPixelValue(node->layout.position[CSS_TOP]),
}, {
RCTRoundPixelValue(absoluteBottomRight.x - absoluteTopLeft.x),
RCTRoundPixelValue(absoluteBottomRight.y - absoluteTopLeft.y)
}};
if (!CGRectEqualToRect(frame, _frame)) {
_frame = frame;
[viewsWithNewFrame addObject:self];
}
absolutePosition.x += node->layout.position[CSS_LEFT];
absolutePosition.y += node->layout.position[CSS_TOP];
[self applyLayoutToChildren:node viewsWithNewFrame:viewsWithNewFrame absolutePosition:absolutePosition];
}
- (void)applyLayoutToChildren:(css_node_t *)node
viewsWithNewFrame:(NSMutableSet<RCTShadowView *> *)viewsWithNewFrame
absolutePosition:(CGPoint)absolutePosition
{
for (int i = 0; i < node->children_count; ++i) {
RCTShadowView *child = (RCTShadowView *)_reactSubviews[i];
[child applyLayoutNode:node->get_child(node->context, i)
viewsWithNewFrame:viewsWithNewFrame
absolutePosition:absolutePosition];
}
}
- (NSDictionary<NSString *, id> *)processUpdatedProperties:(NSMutableSet<RCTApplierBlock> *)applierBlocks
parentProperties:(NSDictionary<NSString *, id> *)parentProperties
{
// TODO: we always refresh all propagated properties when propagation is
// dirtied, but really we should track which properties have changed and
// only update those.
if (_didUpdateSubviews) {
_didUpdateSubviews = NO;
[self didUpdateReactSubviews];
[applierBlocks addObject:^(NSDictionary<NSNumber *, UIView *> *viewRegistry) {
UIView *view = viewRegistry[self->_reactTag];
[view clearSortedSubviews];
[view didUpdateReactSubviews];
}];
}
if (!_backgroundColor) {
UIColor *parentBackgroundColor = parentProperties[RCTBackgroundColorProp];
if (parentBackgroundColor) {
[applierBlocks addObject:^(NSDictionary<NSNumber *, UIView *> *viewRegistry) {
UIView *view = viewRegistry[self->_reactTag];
[view reactSetInheritedBackgroundColor:parentBackgroundColor];
}];
}
} else {
// Update parent properties for children
NSMutableDictionary<NSString *, id> *properties = [NSMutableDictionary dictionaryWithDictionary:parentProperties];
CGFloat alpha = CGColorGetAlpha(_backgroundColor.CGColor);
if (alpha < 1.0) {
// If bg is non-opaque, don't propagate further
properties[RCTBackgroundColorProp] = [UIColor clearColor];
} else {
properties[RCTBackgroundColorProp] = _backgroundColor;
}
return properties;
}
return parentProperties;
}
- (void)collectUpdatedProperties:(NSMutableSet<RCTApplierBlock> *)applierBlocks
parentProperties:(NSDictionary<NSString *, id> *)parentProperties
{
if (_propagationLifecycle == RCTUpdateLifecycleComputed && [parentProperties isEqualToDictionary:_lastParentProperties]) {
return;
}
_propagationLifecycle = RCTUpdateLifecycleComputed;
_lastParentProperties = parentProperties;
NSDictionary<NSString *, id> *nextProps = [self processUpdatedProperties:applierBlocks parentProperties:parentProperties];
for (RCTShadowView *child in _reactSubviews) {
[child collectUpdatedProperties:applierBlocks parentProperties:nextProps];
}
}
- (void)collectUpdatedFrames:(NSMutableSet<RCTShadowView *> *)viewsWithNewFrame
withFrame:(CGRect)frame
hidden:(BOOL)hidden
absolutePosition:(CGPoint)absolutePosition
{
if (_hidden != hidden) {
// The hidden state has changed. Even if the frame hasn't changed, add
// this ShadowView to viewsWithNewFrame so the UIManager will process
// this ShadowView's UIView and update its hidden state.
_hidden = hidden;
[viewsWithNewFrame addObject:self];
}
if (!CGRectEqualToRect(frame, _frame)) {
_cssNode->style.position_type = CSS_POSITION_ABSOLUTE;
_cssNode->style.dimensions[CSS_WIDTH] = frame.size.width;
_cssNode->style.dimensions[CSS_HEIGHT] = frame.size.height;
_cssNode->style.position[CSS_LEFT] = frame.origin.x;
_cssNode->style.position[CSS_TOP] = frame.origin.y;
// Our parent has asked us to change our cssNode->styles. Dirty the layout
// so that we can rerun layout on this node. The request came from our parent
// so there's no need to dirty our ancestors by calling dirtyLayout.
_layoutLifecycle = RCTUpdateLifecycleDirtied;
}
[self fillCSSNode:_cssNode];
layoutNode(_cssNode, frame.size.width, frame.size.height, CSS_DIRECTION_INHERIT);
[self applyLayoutNode:_cssNode viewsWithNewFrame:viewsWithNewFrame absolutePosition:absolutePosition];
}
- (CGRect)measureLayoutRelativeToAncestor:(RCTShadowView *)ancestor
{
CGPoint offset = CGPointZero;
NSInteger depth = 30; // max depth to search
RCTShadowView *shadowView = self;
while (depth && shadowView && shadowView != ancestor) {
offset.x += shadowView.frame.origin.x;
offset.y += shadowView.frame.origin.y;
shadowView = shadowView->_superview;
depth--;
}
if (ancestor != shadowView) {
return CGRectNull;
}
return (CGRect){offset, self.frame.size};
}
- (instancetype)init
{
if ((self = [super init])) {
_frame = CGRectMake(0, 0, CSS_UNDEFINED, CSS_UNDEFINED);
for (unsigned int ii = 0; ii < META_PROP_COUNT; ii++) {
_paddingMetaProps[ii] = CSS_UNDEFINED;
_marginMetaProps[ii] = CSS_UNDEFINED;
_borderMetaProps[ii] = CSS_UNDEFINED;
}
_newView = YES;
_layoutLifecycle = RCTUpdateLifecycleUninitialized;
_propagationLifecycle = RCTUpdateLifecycleUninitialized;
_textLifecycle = RCTUpdateLifecycleUninitialized;
_reactSubviews = [NSMutableArray array];
_cssNode = new_css_node();
_cssNode->context = (__bridge void *)self;
_cssNode->print = RCTPrint;
_cssNode->get_child = RCTGetChild;
_cssNode->is_dirty = RCTIsDirty;
[self fillCSSNode:_cssNode];
}
return self;
}
- (BOOL)isReactRootView
{
return RCTIsReactRootView(self.reactTag);
}
- (void)dealloc
{
free_css_node(_cssNode);
}
- (void)dirtyLayout
{
if (_layoutLifecycle != RCTUpdateLifecycleDirtied) {
_layoutLifecycle = RCTUpdateLifecycleDirtied;
[_superview dirtyLayout];
}
}
- (BOOL)isLayoutDirty
{
return _layoutLifecycle != RCTUpdateLifecycleComputed;
}
- (void)dirtyPropagation
{
if (_propagationLifecycle != RCTUpdateLifecycleDirtied) {
_propagationLifecycle = RCTUpdateLifecycleDirtied;
[_superview dirtyPropagation];
}
}
- (BOOL)isPropagationDirty
{
return _propagationLifecycle != RCTUpdateLifecycleComputed;
}
- (void)dirtyText
{
if (_textLifecycle != RCTUpdateLifecycleDirtied) {
_textLifecycle = RCTUpdateLifecycleDirtied;
[_superview dirtyText];
}
}
- (BOOL)isTextDirty
{
return _textLifecycle != RCTUpdateLifecycleComputed;
}
- (void)setTextComputed
{
_textLifecycle = RCTUpdateLifecycleComputed;
}
- (void)insertReactSubview:(RCTShadowView *)subview atIndex:(NSInteger)atIndex
{
[_reactSubviews insertObject:subview atIndex:atIndex];
_cssNode->children_count = (int)_reactSubviews.count;
subview->_superview = self;
_didUpdateSubviews = YES;
[self dirtyText];
[self dirtyLayout];
[self dirtyPropagation];
}
- (void)removeReactSubview:(RCTShadowView *)subview
{
[subview dirtyText];
[subview dirtyLayout];
[subview dirtyPropagation];
_didUpdateSubviews = YES;
subview->_superview = nil;
[_reactSubviews removeObject:subview];
_cssNode->children_count = (int)_reactSubviews.count;
}
- (NSArray<RCTShadowView *> *)reactSubviews
{
return _reactSubviews;
}
- (RCTShadowView *)reactSuperview
{
return _superview;
}
- (NSNumber *)reactTagAtPoint:(CGPoint)point
{
for (RCTShadowView *shadowView in _reactSubviews) {
if (CGRectContainsPoint(shadowView.frame, point)) {
CGPoint relativePoint = point;
CGPoint origin = shadowView.frame.origin;
relativePoint.x -= origin.x;
relativePoint.y -= origin.y;
return [shadowView reactTagAtPoint:relativePoint];
}
}
return self.reactTag;
}
- (NSString *)description
{
NSString *description = super.description;
description = [[description substringToIndex:description.length - 1] stringByAppendingFormat:@"; viewName: %@; reactTag: %@; frame: %@>", self.viewName, self.reactTag, NSStringFromCGRect(self.frame)];
return description;
}
- (void)addRecursiveDescriptionToString:(NSMutableString *)string atLevel:(NSUInteger)level
{
for (NSUInteger i = 0; i < level; i++) {
[string appendString:@" | "];
}
[string appendString:self.description];
[string appendString:@"\n"];
for (RCTShadowView *subview in _reactSubviews) {
[subview addRecursiveDescriptionToString:string atLevel:level + 1];
}
}
- (NSString *)recursiveDescription
{
NSMutableString *description = [NSMutableString string];
[self addRecursiveDescriptionToString:description atLevel:0];
return description;
}
// Margin
#define RCT_MARGIN_PROPERTY(prop, metaProp) \
- (void)setMargin##prop:(CGFloat)value \
{ \
_marginMetaProps[META_PROP_##metaProp] = value; \
_recomputeMargin = YES; \
} \
- (CGFloat)margin##prop \
{ \
return _marginMetaProps[META_PROP_##metaProp]; \
}
RCT_MARGIN_PROPERTY(, ALL)
RCT_MARGIN_PROPERTY(Vertical, VERTICAL)
RCT_MARGIN_PROPERTY(Horizontal, HORIZONTAL)
RCT_MARGIN_PROPERTY(Top, TOP)
RCT_MARGIN_PROPERTY(Left, LEFT)
RCT_MARGIN_PROPERTY(Bottom, BOTTOM)
RCT_MARGIN_PROPERTY(Right, RIGHT)
// Padding
#define RCT_PADDING_PROPERTY(prop, metaProp) \
- (void)setPadding##prop:(CGFloat)value \
{ \
_paddingMetaProps[META_PROP_##metaProp] = value; \
_recomputePadding = YES; \
} \
- (CGFloat)padding##prop \
{ \
return _paddingMetaProps[META_PROP_##metaProp]; \
}
RCT_PADDING_PROPERTY(, ALL)
RCT_PADDING_PROPERTY(Vertical, VERTICAL)
RCT_PADDING_PROPERTY(Horizontal, HORIZONTAL)
RCT_PADDING_PROPERTY(Top, TOP)
RCT_PADDING_PROPERTY(Left, LEFT)
RCT_PADDING_PROPERTY(Bottom, BOTTOM)
RCT_PADDING_PROPERTY(Right, RIGHT)
- (UIEdgeInsets)paddingAsInsets
{
return (UIEdgeInsets){
_cssNode->style.padding[CSS_TOP],
_cssNode->style.padding[CSS_LEFT],
_cssNode->style.padding[CSS_BOTTOM],
_cssNode->style.padding[CSS_RIGHT]
};
}
// Border
#define RCT_BORDER_PROPERTY(prop, metaProp) \
- (void)setBorder##prop##Width:(CGFloat)value \
{ \
_borderMetaProps[META_PROP_##metaProp] = value; \
_recomputeBorder = YES; \
} \
- (CGFloat)border##prop##Width \
{ \
return _borderMetaProps[META_PROP_##metaProp]; \
}
RCT_BORDER_PROPERTY(, ALL)
RCT_BORDER_PROPERTY(Top, TOP)
RCT_BORDER_PROPERTY(Left, LEFT)
RCT_BORDER_PROPERTY(Bottom, BOTTOM)
RCT_BORDER_PROPERTY(Right, RIGHT)
// Dimensions
#define RCT_DIMENSION_PROPERTY(setProp, getProp, cssProp, category) \
- (void)set##setProp:(CGFloat)value \
{ \
_cssNode->style.category[CSS_##cssProp] = value; \
[self dirtyLayout]; \
[self dirtyText]; \
} \
- (CGFloat)getProp \
{ \
return _cssNode->style.category[CSS_##cssProp]; \
}
RCT_DIMENSION_PROPERTY(Width, width, WIDTH, dimensions)
RCT_DIMENSION_PROPERTY(Height, height, HEIGHT, dimensions)
RCT_DIMENSION_PROPERTY(MinWidth, minWidth, WIDTH, minDimensions)
RCT_DIMENSION_PROPERTY(MaxWidth, maxWidth, WIDTH, maxDimensions)
RCT_DIMENSION_PROPERTY(MinHeight, minHeight, HEIGHT, minDimensions)
RCT_DIMENSION_PROPERTY(MaxHeight, maxHeight, HEIGHT, maxDimensions)
// Position
#define RCT_POSITION_PROPERTY(setProp, getProp, cssProp) \
RCT_DIMENSION_PROPERTY(setProp, getProp, cssProp, position)
RCT_POSITION_PROPERTY(Top, top, TOP)
RCT_POSITION_PROPERTY(Right, right, RIGHT)
RCT_POSITION_PROPERTY(Bottom, bottom, BOTTOM)
RCT_POSITION_PROPERTY(Left, left, LEFT)
- (void)setFrame:(CGRect)frame
{
_cssNode->style.position[CSS_LEFT] = CGRectGetMinX(frame);
_cssNode->style.position[CSS_TOP] = CGRectGetMinY(frame);
_cssNode->style.dimensions[CSS_WIDTH] = CGRectGetWidth(frame);
_cssNode->style.dimensions[CSS_HEIGHT] = CGRectGetHeight(frame);
[self dirtyLayout];
}
static inline BOOL RCTAssignSuggestedDimension(css_node_t *css_node, int dimension, CGFloat amount)
{
if (amount != UIViewNoIntrinsicMetric
&& isnan(css_node->style.dimensions[dimension])) {
css_node->style.dimensions[dimension] = amount;
return YES;
}
return NO;
}
- (void)setIntrinsicContentSize:(CGSize)size
{
if (_cssNode->style.flex == 0) {
BOOL dirty = NO;
dirty |= RCTAssignSuggestedDimension(_cssNode, CSS_HEIGHT, size.height);
dirty |= RCTAssignSuggestedDimension(_cssNode, CSS_WIDTH, size.width);
if (dirty) {
[self dirtyLayout];
}
}
}
- (void)setTopLeft:(CGPoint)topLeft
{
_cssNode->style.position[CSS_LEFT] = topLeft.x;
_cssNode->style.position[CSS_TOP] = topLeft.y;
[self dirtyLayout];
}
- (void)setSize:(CGSize)size
{
_cssNode->style.dimensions[CSS_WIDTH] = size.width;
_cssNode->style.dimensions[CSS_HEIGHT] = size.height;
[self dirtyLayout];
}
// Flex
#define RCT_STYLE_PROPERTY(setProp, getProp, cssProp, type) \
- (void)set##setProp:(type)value \
{ \
_cssNode->style.cssProp = value; \
[self dirtyLayout]; \
} \
- (type)getProp \
{ \
return _cssNode->style.cssProp; \
}
RCT_STYLE_PROPERTY(Flex, flex, flex, CGFloat)
RCT_STYLE_PROPERTY(FlexDirection, flexDirection, flex_direction, css_flex_direction_t)
RCT_STYLE_PROPERTY(JustifyContent, justifyContent, justify_content, css_justify_t)
RCT_STYLE_PROPERTY(AlignSelf, alignSelf, align_self, css_align_t)
RCT_STYLE_PROPERTY(AlignItems, alignItems, align_items, css_align_t)
RCT_STYLE_PROPERTY(Position, position, position_type, css_position_type_t)
RCT_STYLE_PROPERTY(FlexWrap, flexWrap, flex_wrap, css_wrap_type_t)
- (void)setBackgroundColor:(UIColor *)color
{
_backgroundColor = color;
[self dirtyPropagation];
}
- (void)setZIndex:(NSInteger)zIndex
{
_zIndex = zIndex;
if (_superview) {
// Changing zIndex means the subview order of the parent needs updating
_superview->_didUpdateSubviews = YES;
[_superview dirtyPropagation];
}
}
- (void)didUpdateReactSubviews
{
// Does nothing by default
}
- (void)didSetProps:(__unused NSArray<NSString *> *)changedProps
{
if (_recomputePadding) {
RCTProcessMetaProps(_paddingMetaProps, _cssNode->style.padding);
}
if (_recomputeMargin) {
RCTProcessMetaProps(_marginMetaProps, _cssNode->style.margin);
}
if (_recomputeBorder) {
RCTProcessMetaProps(_borderMetaProps, _cssNode->style.border);
}
if (_recomputePadding || _recomputeMargin || _recomputeBorder) {
[self dirtyLayout];
}
[self fillCSSNode:_cssNode];
_recomputeMargin = NO;
_recomputePadding = NO;
_recomputeBorder = NO;
}
@end
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