180 lines
6.7 KiB
Objective-C
180 lines
6.7 KiB
Objective-C
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#import <UIKit/UIKit.h>
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#import "Layout.h"
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#import "RCTComponent.h"
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#import "RCTRootView.h"
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@class RCTSparseArray;
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typedef NS_ENUM(NSUInteger, RCTUpdateLifecycle) {
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RCTUpdateLifecycleUninitialized = 0,
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RCTUpdateLifecycleComputed,
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RCTUpdateLifecycleDirtied,
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};
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typedef void (^RCTApplierBlock)(NSDictionary<NSNumber *, UIView *> *viewRegistry);
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/**
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* ShadowView tree mirrors RCT view tree. Every node is highly stateful.
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* 1. A node is in one of three lifecycles: uninitialized, computed, dirtied.
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* 1. RCTBridge may call any of the padding/margin/width/height/top/left setters. A setter would dirty
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* the node and all of its ancestors.
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* 2. At the end of each Bridge transaction, we call collectUpdatedFrames:widthConstraint:heightConstraint
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* at the root node to recursively lay out the entire hierarchy.
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* 3. If a node is "computed" and the constraint passed from above is identical to the constraint used to
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* perform the last computation, we skip laying out the subtree entirely.
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*/
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@interface RCTShadowView : NSObject <RCTComponent>
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- (NSArray<RCTShadowView *> *)reactSubviews;
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- (RCTShadowView *)reactSuperview;
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@property (nonatomic, weak, readonly) RCTShadowView *superview;
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@property (nonatomic, assign, readonly) css_node_t *cssNode;
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@property (nonatomic, copy) NSString *viewName;
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@property (nonatomic, strong) UIColor *backgroundColor; // Used to propagate to children
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@property (nonatomic, assign) RCTUpdateLifecycle layoutLifecycle;
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@property (nonatomic, copy) RCTDirectEventBlock onLayout;
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/**
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* isNewView - Used to track the first time the view is introduced into the hierarchy. It is initialized YES, then is
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* set to NO in RCTUIManager after the layout pass is done and all frames have been extracted to be applied to the
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* corresponding UIViews.
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*/
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@property (nonatomic, assign, getter=isNewView) BOOL newView;
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/**
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* Position and dimensions.
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* Defaults to { 0, 0, NAN, NAN }.
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*/
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@property (nonatomic, assign) CGFloat top;
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@property (nonatomic, assign) CGFloat left;
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@property (nonatomic, assign) CGFloat bottom;
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@property (nonatomic, assign) CGFloat right;
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@property (nonatomic, assign) CGFloat width;
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@property (nonatomic, assign) CGFloat height;
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@property (nonatomic, assign) CGFloat minWidth;
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@property (nonatomic, assign) CGFloat minHeight;
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@property (nonatomic, assign) CGFloat maxWidth;
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@property (nonatomic, assign) CGFloat maxHeight;
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@property (nonatomic, assign) CGRect frame;
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- (void)setTopLeft:(CGPoint)topLeft;
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- (void)setSize:(CGSize)size;
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/**
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* Size flexibility type used to find size constraints.
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* Default to RCTRootViewSizeFlexibilityNone
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*/
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@property (nonatomic, assign) RCTRootViewSizeFlexibility sizeFlexibility;
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/**
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* Border. Defaults to { 0, 0, 0, 0 }.
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*/
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@property (nonatomic, assign) CGFloat borderWidth;
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@property (nonatomic, assign) CGFloat borderTopWidth;
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@property (nonatomic, assign) CGFloat borderLeftWidth;
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@property (nonatomic, assign) CGFloat borderBottomWidth;
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@property (nonatomic, assign) CGFloat borderRightWidth;
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/**
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* Margin. Defaults to { 0, 0, 0, 0 }.
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*/
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@property (nonatomic, assign) CGFloat margin;
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@property (nonatomic, assign) CGFloat marginVertical;
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@property (nonatomic, assign) CGFloat marginHorizontal;
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@property (nonatomic, assign) CGFloat marginTop;
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@property (nonatomic, assign) CGFloat marginLeft;
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@property (nonatomic, assign) CGFloat marginBottom;
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@property (nonatomic, assign) CGFloat marginRight;
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/**
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* Padding. Defaults to { 0, 0, 0, 0 }.
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*/
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@property (nonatomic, assign) CGFloat padding;
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@property (nonatomic, assign) CGFloat paddingVertical;
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@property (nonatomic, assign) CGFloat paddingHorizontal;
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@property (nonatomic, assign) CGFloat paddingTop;
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@property (nonatomic, assign) CGFloat paddingLeft;
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@property (nonatomic, assign) CGFloat paddingBottom;
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@property (nonatomic, assign) CGFloat paddingRight;
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- (UIEdgeInsets)paddingAsInsets;
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/**
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* Flexbox properties. All zero/disabled by default
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*/
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@property (nonatomic, assign) css_flex_direction_t flexDirection;
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@property (nonatomic, assign) css_justify_t justifyContent;
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@property (nonatomic, assign) css_align_t alignSelf;
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@property (nonatomic, assign) css_align_t alignItems;
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@property (nonatomic, assign) css_position_type_t position;
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@property (nonatomic, assign) css_wrap_type_t flexWrap;
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@property (nonatomic, assign) CGFloat flex;
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/**
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* Calculate property changes that need to be propagated to the view.
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* The applierBlocks set contains RCTApplierBlock functions that must be applied
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* on the main thread in order to update the view.
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*/
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- (void)collectUpdatedProperties:(NSMutableSet<RCTApplierBlock> *)applierBlocks
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parentProperties:(NSDictionary<NSString *, id> *)parentProperties;
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/**
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* Process the updated properties and apply them to view. Shadow view classes
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* that add additional propagating properties should override this method.
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*/
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- (NSDictionary<NSString *, id> *)processUpdatedProperties:(NSMutableSet<RCTApplierBlock> *)applierBlocks
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parentProperties:(NSDictionary<NSString *, id> *)parentProperties NS_REQUIRES_SUPER;
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/**
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* Calculate all views whose frame needs updating after layout has been calculated.
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* Returns a set contains the shadowviews that need updating.
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*/
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- (NSSet<RCTShadowView *> *)collectRootUpdatedFrames;
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/**
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* Recursively apply layout to children.
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*/
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- (void)applyLayoutNode:(css_node_t *)node
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viewsWithNewFrame:(NSMutableSet<RCTShadowView *> *)viewsWithNewFrame
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absolutePosition:(CGPoint)absolutePosition NS_REQUIRES_SUPER;
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/**
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* The following are implementation details exposed to subclasses. Do not call them directly
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*/
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- (void)fillCSSNode:(css_node_t *)node NS_REQUIRES_SUPER;
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- (void)dirtyLayout NS_REQUIRES_SUPER;
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- (BOOL)isLayoutDirty;
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- (void)dirtyPropagation NS_REQUIRES_SUPER;
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- (BOOL)isPropagationDirty;
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- (void)dirtyText NS_REQUIRES_SUPER;
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- (void)setTextComputed NS_REQUIRES_SUPER;
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- (BOOL)isTextDirty;
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- (void)didSetProps:(NSArray<NSString *> *)changedProps NS_REQUIRES_SUPER;
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/**
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* Computes the recursive offset, meaning the sum of all descendant offsets -
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* this is the sum of all positions inset from parents. This is not merely the
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* sum of `top`/`left`s, as this function uses the *actual* positions of
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* children, not the style specified positions - it computes this based on the
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* 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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*/
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- (CGRect)measureLayoutRelativeToAncestor:(RCTShadowView *)ancestor;
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@end
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