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82 lines
2.9 KiB
Plaintext
82 lines
2.9 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 "ASStackTextLayoutSpec.h"
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#import "ASStackLayoutable.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 "ASStackTextPositionedLayout.h"
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#import "ASThread.h"
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@implementation ASStackTextLayoutSpec
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{
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ASStackTextLayoutSpecStyle _textStyle;
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std::vector<id<ASStackLayoutable>> _stackChildren;
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ASDN::RecursiveMutex _propertyLock;
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}
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@synthesize ascender = _ascender;
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@synthesize descender = _descender;
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+ (instancetype)newWithStyle:(ASStackTextLayoutSpecStyle)style children:(NSArray *)children
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{
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ASDisplayNodeAssert((style.stackLayoutStyle.direction == ASStackLayoutDirectionHorizontal && style.baselineAlignment != ASStackTextLayoutBaselineAlignmentNone) || style.stackLayoutStyle.direction == ASStackLayoutDirectionVertical, @"baselineAlignment is set to none. If you don't need baseline alignment please use ASStackLayoutSpec");
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ASStackTextLayoutSpec *spec = [super new];
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if (spec) {
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spec->_textStyle = style;
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spec->_stackChildren = std::vector<id<ASStackLayoutable>>();
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for (id<ASStackTextLayoutable> child in children) {
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ASDisplayNodeAssert([child conformsToProtocol:@protocol(ASStackTextLayoutable)], @"child must conform to ASStackLayoutable");
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spec->_stackChildren.push_back(child);
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}
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}
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return spec;
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}
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+ (instancetype)new
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{
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ASDISPLAYNODE_NOT_DESIGNATED_INITIALIZER();
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}
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- (ASLayout *)measureWithSizeRange:(ASSizeRange)constrainedSize
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{
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ASStackLayoutSpecStyle stackStyle = _textStyle.stackLayoutStyle;
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const auto unpositionedLayout = ASStackUnpositionedLayout::compute(_stackChildren, stackStyle, constrainedSize);
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const auto positionedLayout = ASStackPositionedLayout::compute(unpositionedLayout, stackStyle, constrainedSize);
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const auto baselinePositionedLayout = ASStackTextPositionedLayout::compute(positionedLayout, _textStyle, constrainedSize);
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const CGSize finalSize = directionSize(stackStyle.direction, unpositionedLayout.stackDimensionSum, baselinePositionedLayout.crossSize);
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NSArray *sublayouts = [NSArray arrayWithObjects:&baselinePositionedLayout.sublayouts[0] count:baselinePositionedLayout.sublayouts.size()];
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ASDN::MutexLocker l(_propertyLock);
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_ascender = baselinePositionedLayout.ascender;
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_descender = baselinePositionedLayout.descender;
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return [ASLayout newWithLayoutableObject: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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