react-native/React/Views/RCTShadowView.h

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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 <UIKit/UIKit.h>
#import "Layout.h"
#import "RCTComponent.h"
#import "RCTRootView.h"
@class RCTSparseArray;
typedef NS_ENUM(NSUInteger, RCTUpdateLifecycle) {
RCTUpdateLifecycleUninitialized = 0,
RCTUpdateLifecycleComputed,
RCTUpdateLifecycleDirtied,
};
typedef void (^RCTApplierBlock)(NSDictionary<NSNumber *, UIView *> *viewRegistry);
/**
* ShadowView tree mirrors RCT view tree. Every node is highly stateful.
* 1. A node is in one of three lifecycles: uninitialized, computed, dirtied.
* 1. RCTBridge may call any of the padding/margin/width/height/top/left setters. A setter would dirty
* the node and all of its ancestors.
* 2. At the end of each Bridge transaction, we call collectUpdatedFrames:widthConstraint:heightConstraint
* at the root node to recursively lay out the entire hierarchy.
* 3. If a node is "computed" and the constraint passed from above is identical to the constraint used to
* perform the last computation, we skip laying out the subtree entirely.
*/
@interface RCTShadowView : NSObject <RCTComponent>
- (NSArray<RCTShadowView *> *)reactSubviews;
- (RCTShadowView *)reactSuperview;
@property (nonatomic, weak, readonly) RCTShadowView *superview;
@property (nonatomic, assign, readonly) css_node_t *cssNode;
@property (nonatomic, copy) NSString *viewName;
@property (nonatomic, strong) UIColor *backgroundColor; // Used to propagate to children
@property (nonatomic, assign) RCTUpdateLifecycle layoutLifecycle;
@property (nonatomic, copy) RCTDirectEventBlock onLayout;
/**
* isNewView - Used to track the first time the view is introduced into the hierarchy. It is initialized YES, then is
* set to NO in RCTUIManager after the layout pass is done and all frames have been extracted to be applied to the
* corresponding UIViews.
*/
@property (nonatomic, assign, getter=isNewView) BOOL newView;
/**
* Position and dimensions.
* Defaults to { 0, 0, NAN, NAN }.
*/
@property (nonatomic, assign) CGFloat top;
@property (nonatomic, assign) CGFloat left;
@property (nonatomic, assign) CGFloat bottom;
@property (nonatomic, assign) CGFloat right;
@property (nonatomic, assign) CGFloat width;
@property (nonatomic, assign) CGFloat height;
@property (nonatomic, assign) CGFloat minWidth;
@property (nonatomic, assign) CGFloat minHeight;
@property (nonatomic, assign) CGFloat maxWidth;
@property (nonatomic, assign) CGFloat maxHeight;
@property (nonatomic, assign) CGRect frame;
- (void)setTopLeft:(CGPoint)topLeft;
- (void)setSize:(CGSize)size;
/**
* Size flexibility type used to find size constraints.
* Default to RCTRootViewSizeFlexibilityNone
*/
@property (nonatomic, assign) RCTRootViewSizeFlexibility sizeFlexibility;
/**
* Border. Defaults to { 0, 0, 0, 0 }.
*/
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@property (nonatomic, assign) CGFloat borderWidth;
@property (nonatomic, assign) CGFloat borderTopWidth;
@property (nonatomic, assign) CGFloat borderLeftWidth;
@property (nonatomic, assign) CGFloat borderBottomWidth;
@property (nonatomic, assign) CGFloat borderRightWidth;
/**
* Margin. Defaults to { 0, 0, 0, 0 }.
*/
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@property (nonatomic, assign) CGFloat margin;
@property (nonatomic, assign) CGFloat marginVertical;
@property (nonatomic, assign) CGFloat marginHorizontal;
@property (nonatomic, assign) CGFloat marginTop;
@property (nonatomic, assign) CGFloat marginLeft;
@property (nonatomic, assign) CGFloat marginBottom;
@property (nonatomic, assign) CGFloat marginRight;
/**
* Padding. Defaults to { 0, 0, 0, 0 }.
*/
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@property (nonatomic, assign) CGFloat padding;
@property (nonatomic, assign) CGFloat paddingVertical;
@property (nonatomic, assign) CGFloat paddingHorizontal;
@property (nonatomic, assign) CGFloat paddingTop;
@property (nonatomic, assign) CGFloat paddingLeft;
@property (nonatomic, assign) CGFloat paddingBottom;
@property (nonatomic, assign) CGFloat paddingRight;
- (UIEdgeInsets)paddingAsInsets;
/**
* Flexbox properties. All zero/disabled by default
*/
@property (nonatomic, assign) css_flex_direction_t flexDirection;
@property (nonatomic, assign) css_justify_t justifyContent;
@property (nonatomic, assign) css_align_t alignSelf;
@property (nonatomic, assign) css_align_t alignItems;
@property (nonatomic, assign) css_position_type_t position;
@property (nonatomic, assign) css_wrap_type_t flexWrap;
@property (nonatomic, assign) CGFloat flex;
/**
* Calculate property changes that need to be propagated to the view.
* The applierBlocks set contains RCTApplierBlock functions that must be applied
* on the main thread in order to update the view.
*/
- (void)collectUpdatedProperties:(NSMutableSet<RCTApplierBlock> *)applierBlocks
parentProperties:(NSDictionary<NSString *, id> *)parentProperties;
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/**
* Process the updated properties and apply them to view. Shadow view classes
* that add additional propagating properties should override this method.
*/
- (NSDictionary<NSString *, id> *)processUpdatedProperties:(NSMutableSet<RCTApplierBlock> *)applierBlocks
parentProperties:(NSDictionary<NSString *, id> *)parentProperties NS_REQUIRES_SUPER;
/**
* Calculate all views whose frame needs updating after layout has been calculated.
* Returns a set contains the shadowviews that need updating.
*/
- (NSSet<RCTShadowView *> *)collectRootUpdatedFrames;
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/**
* Recursively apply layout to children.
*/
- (void)applyLayoutNode:(css_node_t *)node
viewsWithNewFrame:(NSMutableSet<RCTShadowView *> *)viewsWithNewFrame
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absolutePosition:(CGPoint)absolutePosition NS_REQUIRES_SUPER;
/**
* The following are implementation details exposed to subclasses. Do not call them directly
*/
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- (void)fillCSSNode:(css_node_t *)node NS_REQUIRES_SUPER;
- (void)dirtyLayout NS_REQUIRES_SUPER;
- (BOOL)isLayoutDirty;
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- (void)dirtyPropagation NS_REQUIRES_SUPER;
- (BOOL)isPropagationDirty;
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- (void)dirtyText NS_REQUIRES_SUPER;
- (void)setTextComputed NS_REQUIRES_SUPER;
- (BOOL)isTextDirty;
- (void)didSetProps:(NSArray<NSString *> *)changedProps NS_REQUIRES_SUPER;
/**
* Computes the recursive offset, meaning the sum of all descendant offsets -
* this is the sum of all positions inset from parents. This is not merely the
* sum of `top`/`left`s, as this function uses the *actual* positions of
* children, not the style specified positions - it computes this based on the
* resulting layout. It does not yet compensate for native scroll view insets or
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* transforms or anchor points.
*/
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- (CGRect)measureLayoutRelativeToAncestor:(RCTShadowView *)ancestor;
@end