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110 lines
4.1 KiB
Plaintext
110 lines
4.1 KiB
Plaintext
/*
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* Copyright (c) 2014-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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*/
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#import "ASStackLayoutSpec.h"
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#import <numeric>
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#import <vector>
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#import "ASBaseDefines.h"
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#import "ASInternalHelpers.h"
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#import "ASLayoutSpecUtilities.h"
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#import "ASStackLayoutSpecUtilities.h"
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#import "ASStackPositionedLayout.h"
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#import "ASStackUnpositionedLayout.h"
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#import "ASThread.h"
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@implementation ASStackLayoutSpec
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- (instancetype)init
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{
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return [self initWithDirection:ASStackLayoutDirectionHorizontal spacing:0.0 justifyContent:ASStackLayoutJustifyContentStart alignItems:ASStackLayoutAlignItemsStart children:nil];
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}
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+ (instancetype)stackLayoutSpecWithDirection:(ASStackLayoutDirection)direction spacing:(CGFloat)spacing justifyContent:(ASStackLayoutJustifyContent)justifyContent alignItems:(ASStackLayoutAlignItems)alignItems children:(NSArray *)children
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{
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return [[self alloc] initWithDirection:direction spacing:spacing justifyContent:justifyContent alignItems:alignItems children:children];
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}
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- (instancetype)initWithDirection:(ASStackLayoutDirection)direction spacing:(CGFloat)spacing justifyContent:(ASStackLayoutJustifyContent)justifyContent alignItems:(ASStackLayoutAlignItems)alignItems children:(NSArray *)children
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{
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if (!(self = [super init])) {
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return nil;
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}
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_direction = direction;
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_alignItems = alignItems;
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_spacing = spacing;
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_justifyContent = justifyContent;
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[self setChildren:children];
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return self;
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}
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- (void)setDirection:(ASStackLayoutDirection)direction
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{
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ASDisplayNodeAssert(self.isMutable, @"Cannot set properties when layout spec is not mutable");
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_direction = direction;
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}
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- (void)setAlignItems:(ASStackLayoutAlignItems)alignItems
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{
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ASDisplayNodeAssert(self.isMutable, @"Cannot set properties when layout spec is not mutable");
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_alignItems = alignItems;
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}
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- (void)setJustifyContent:(ASStackLayoutJustifyContent)justifyContent
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{
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ASDisplayNodeAssert(self.isMutable, @"Cannot set properties when layout spec is not mutable");
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_justifyContent = justifyContent;
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}
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- (void)setSpacing:(CGFloat)spacing
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{
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ASDisplayNodeAssert(self.isMutable, @"Cannot set properties when layout spec is not mutable");
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_spacing = spacing;
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}
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- (void)setChildren:(NSArray *)children
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{
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[super setChildren:children];
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#if DEBUG
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for (id<ASStackLayoutable> child in children) {
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ASDisplayNodeAssert(([child finalLayoutable] == child && [child conformsToProtocol:@protocol(ASStackLayoutable)]) || ([child finalLayoutable] != child && [[child finalLayoutable] conformsToProtocol:@protocol(ASStackLayoutable)]), @"child must conform to ASBaselineLayoutable");
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}
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#endif
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}
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- (void)setChild:(id<ASLayoutable>)child forIdentifier:(NSString *)identifier
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{
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ASDisplayNodeAssert(NO, @"ASStackLayoutSpec only supports setChildren");
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}
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- (ASLayout *)measureWithSizeRange:(ASSizeRange)constrainedSize
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{
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ASStackLayoutSpecStyle style = {.direction = _direction, .spacing = _spacing, .justifyContent = _justifyContent, .alignItems = _alignItems};
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std::vector<id<ASStackLayoutable>> stackChildren = std::vector<id<ASStackLayoutable>>();
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for (id<ASStackLayoutable> child in self.children) {
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NSAssert([child conformsToProtocol:@protocol(ASStackLayoutable)], @"Child must implement ASStackLayoutable");
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stackChildren.push_back(child);
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}
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const auto unpositionedLayout = ASStackUnpositionedLayout::compute(stackChildren, style, constrainedSize);
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const auto positionedLayout = ASStackPositionedLayout::compute(unpositionedLayout, style, constrainedSize);
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const CGSize finalSize = directionSize(style.direction, unpositionedLayout.stackDimensionSum, positionedLayout.crossSize);
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NSArray *sublayouts = [NSArray arrayWithObjects:&positionedLayout.sublayouts[0] count:positionedLayout.sublayouts.size()];
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return [ASLayout layoutWithLayoutableObject:self
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size:ASSizeRangeClamp(constrainedSize, finalSize)
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sublayouts:sublayouts];
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}
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@end
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