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moved baseline alignment to a layout spec.

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This commit is contained in:
ricky cancro
2015-08-20 10:38:54 -07:00
committed by rcancro
parent 9036ab8e7d
commit 2d6ddfe32e
7 changed files with 243 additions and 144 deletions
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140
AsyncDisplayKit/Layout/ASStackTextLayoutSpec.mm
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@@ -1,10 +1,12 @@
//
// ASStackTextLayoutSpec.m
// AsyncDisplayKit
//
// Created by ricky cancro on 8/19/15.
// Copyright (c) 2015 Facebook. All rights reserved.
//
/*
* Copyright (c) 2014-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 "ASStackTextLayoutSpec.h"
#import "ASStackLayoutable.h"
@@ -19,109 +21,61 @@
#import "ASStackLayoutSpecUtilities.h"
#import "ASStackPositionedLayout.h"
#import "ASStackUnpositionedLayout.h"
#import "ASStackTextPositionedLayout.h"
#import "ASThread.h"
static CGFloat baselineForItem(const ASStackTextLayoutSpecStyle &style,
const ASLayout *layout) {
__weak id<ASStackTextLayoutable> textChild = (id<ASStackTextLayoutable>) layout.layoutableObject;
switch (style.baselineAlignment) {
case ASStackTextLayoutBaselineAlignmentNone:
return 0;
case ASStackTextLayoutBaselineAlignmentFirst:
return textChild.ascender;
case ASStackTextLayoutBaselineAlignmentLast:
return textChild.descender;
}
}
static CGFloat baselineOffset(const ASStackTextLayoutSpecStyle &style,
const ASLayout *l,
const CGFloat maxBaseline)
{
switch (style.baselineAlignment) {
case ASStackTextLayoutBaselineAlignmentFirst:
case ASStackTextLayoutBaselineAlignmentLast:
return maxBaseline - baselineForItem(style, l);
case ASStackTextLayoutBaselineAlignmentNone:
return 0;
}
}
@implementation ASStackTextLayoutSpec
{
ASStackTextLayoutSpecStyle _textStyle;
std::vector<id<ASStackTextLayoutable>> _children;
std::vector<id<ASStackLayoutable>> _stackChildren;
ASDN::RecursiveMutex _propertyLock;
ASStackTextLayoutSpecStyle _textStyle;
std::vector<id<ASStackLayoutable>> _stackChildren;
ASDN::RecursiveMutex _propertyLock;
}
@synthesize ascender = _ascender;
@synthesize descender = _descender;
+ (instancetype)newWithStyle:(ASStackTextLayoutSpecStyle)style children:(NSArray *)children
{
ASDisplayNodeAssert(style.stackLayoutStyle.direction == ASStackLayoutDirectionHorizontal && style.baselineAlignment != ASStackTextLayoutBaselineAlignmentNone, @"if you don't need baseline alignment, use ASStackLayoutSpec");
ASStackTextLayoutSpec *spec = [super new];
if (spec) {
spec->_textStyle = style;
spec->_children = std::vector<id<ASStackTextLayoutable>>();
for (id<ASStackTextLayoutable> child in children) {
ASDisplayNodeAssert([child conformsToProtocol:@protocol(ASStackTextLayoutable)], @"child must conform to ASStackLayoutable");
spec->_children.push_back(child);
spec->_stackChildren.push_back(child);
}
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");
ASStackTextLayoutSpec *spec = [super new];
if (spec) {
spec->_textStyle = style;
spec->_stackChildren = std::vector<id<ASStackLayoutable>>();
for (id<ASStackTextLayoutable> child in children) {
ASDisplayNodeAssert([child conformsToProtocol:@protocol(ASStackTextLayoutable)], @"child must conform to ASStackLayoutable");
spec->_stackChildren.push_back(child);
}
return spec;
}
return spec;
}
+ (instancetype)new
{
ASDISPLAYNODE_NOT_DESIGNATED_INITIALIZER();
ASDISPLAYNODE_NOT_DESIGNATED_INITIALIZER();
}
- (ASLayout *)measureWithSizeRange:(ASSizeRange)constrainedSize
{
ASStackLayoutSpecStyle stackStyle = _textStyle.stackLayoutStyle;
const auto unpositionedLayout = ASStackUnpositionedLayout::compute(_stackChildren, stackStyle, constrainedSize);
const auto positionedLayout = ASStackPositionedLayout::compute(unpositionedLayout, stackStyle, constrainedSize);
// Alter the positioned layouts to include baselines
const auto baselineIt = std::max_element(positionedLayout.sublayouts.begin(), positionedLayout.sublayouts.end(), [&](const ASLayout *a, const ASLayout *b){
return baselineForItem(_textStyle, a) < baselineForItem(_textStyle, b);
});
const CGFloat maxBaseline = baselineIt == positionedLayout.sublayouts.end() ? 0 : baselineForItem(_textStyle, *baselineIt);
CGPoint p = CGPointZero;
BOOL first = YES;
auto stackedChildren = AS::map(positionedLayout.sublayouts, [&](ASLayout *l) -> ASLayout *{
__weak id<ASStackTextLayoutable> textChild = (id<ASStackTextLayoutable>) l.layoutableObject;
if (first) {
p = l.position;
}
first = NO;
if (stackStyle.direction == ASStackLayoutDirectionHorizontal) {
l.position = p + CGPointMake(0, baselineOffset(_textStyle, l, maxBaseline));
}
CGFloat spacingAfterBaseline = (stackStyle.direction == ASStackLayoutDirectionVertical) ? textChild.descender : 0;
p = p + directionPoint(stackStyle.direction, stackDimension(stackStyle.direction, l.size) + [(id<ASStackLayoutable>)l.layoutableObject spacingAfter] + spacingAfterBaseline, 0);
return l;
});
const ASStackPositionedLayout alteredPositionedLayouts = {stackedChildren, positionedLayout.crossSize};
const CGSize finalSize = directionSize(stackStyle.direction, unpositionedLayout.stackDimensionSum, alteredPositionedLayouts.crossSize);
NSArray *sublayouts = [NSArray arrayWithObjects:&alteredPositionedLayouts.sublayouts[0] count:alteredPositionedLayouts.sublayouts.size()];
return [ASLayout newWithLayoutableObject:self
size:ASSizeRangeClamp(constrainedSize, finalSize)
sublayouts:sublayouts];
ASStackLayoutSpecStyle stackStyle = _textStyle.stackLayoutStyle;
const auto unpositionedLayout = ASStackUnpositionedLayout::compute(_stackChildren, stackStyle, constrainedSize);
const auto positionedLayout = ASStackPositionedLayout::compute(unpositionedLayout, stackStyle, constrainedSize);
const auto baselinePositionedLayout = ASStackTextPositionedLayout::compute(positionedLayout, _textStyle, constrainedSize);
const CGSize finalSize = directionSize(stackStyle.direction, unpositionedLayout.stackDimensionSum, baselinePositionedLayout.crossSize);
NSArray *sublayouts = [NSArray arrayWithObjects:&baselinePositionedLayout.sublayouts[0] count:baselinePositionedLayout.sublayouts.size()];
ASDN::MutexLocker l(_propertyLock);
_ascender = baselinePositionedLayout.ascender;
_descender = baselinePositionedLayout.descender;
return [ASLayout newWithLayoutableObject:self
size:ASSizeRangeClamp(constrainedSize, finalSize)
sublayouts:sublayouts];
}
@end