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8897614f0e
* Initial commit for adding a size constraint to ASLayoutable's * Some more commits * Fix sample projects in extra/ * Remove preferredFrameSize test of ASEditableTextNode * Remove preferredFrameSize from examples_extra * Add deprecation warning to -[ASDisplayNode preferredFrameSize] * Add deprecation warning to -[ASDisplayNode measureWithSizeRange:] * Commit * Commit * Remove ASRelativeSizeRange * Make ASRelativeSize private * Adjust examples * Improve setting of -[ASLayoutable size] with points or fractions * Add ASWrapperLayoutSpec * Improve creation of ASRelativeDimension * Add `preferredFrameSize` back and add deprecated logging * Add `layoutSpecBlock` setter and getter and add locking for it * Add better documentation and fix macros to create ASRelativeDimension * Create new ASSizeRangeMake with just a CGSize as parameter * Update Kitten and Social App Layout example * Add layoutThatFits: and deprecate measure: * Rename ASRelativeDimension to ASDimension * Fix examples for ASDimension renaming * Remove fancy height and width setter * Fix ASDimension helper * Rename -[ASLayout layoutableObject] to -[ASLayout layoutable] * Update layout related methods and more clearer documentation around how to use it * Deprecate old ASLayout class constructors * Don't unnecessary recalculate layout if constrained or parent size did not change * Use shared pointer for ASDisplayNodeLayout * Fix rebase conflicts * Add documentation and move implementation in mm file of ASDisplayNodeLayout * Fix test errors * Rename ASSize to ASLayoutableSize * Address comments * Rename setSizeFromCGSize to setSizeWithCGSize * Improve inline functions in ASDimension * Fix rebase conflicts
93 lines
3.0 KiB
Plaintext
93 lines
3.0 KiB
Plaintext
//
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// ASRatioLayoutSpec.mm
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// AsyncDisplayKit
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//
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// Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
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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 "ASRatioLayoutSpec.h"
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#import <algorithm>
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#import <tgmath.h>
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#import <vector>
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#import "ASAssert.h"
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#import "ASInternalHelpers.h"
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#import "ASLayout.h"
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@implementation ASRatioLayoutSpec
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{
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CGFloat _ratio;
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}
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+ (instancetype)ratioLayoutSpecWithRatio:(CGFloat)ratio child:(id<ASLayoutable>)child
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{
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return [[self alloc] initWithRatio:ratio child:child];
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}
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- (instancetype)initWithRatio:(CGFloat)ratio child:(id<ASLayoutable>)child;
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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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ASDisplayNodeAssertNotNil(child, @"Child cannot be nil");
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ASDisplayNodeAssert(ratio > 0, @"Ratio should be strictly positive, but received %f", ratio);
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_ratio = ratio;
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[self setChild:child];
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return self;
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}
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- (void)setRatio:(CGFloat)ratio
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{
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ASDisplayNodeAssert(self.isMutable, @"Cannot set properties when layout spec is not mutable");
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_ratio = ratio;
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}
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- (ASLayout *)calculateLayoutThatFits:(ASSizeRange)constrainedSize
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{
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std::vector<CGSize> sizeOptions;
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// TODO: layout: isValidForLayout() call should not be necessary if INFINITY is used
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if (!isinf(constrainedSize.max.width) && ASPointsAreValidForLayout(constrainedSize.max.width)) {
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sizeOptions.push_back(ASSizeRangeClamp(constrainedSize, {
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constrainedSize.max.width,
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ASFloorPixelValue(_ratio * constrainedSize.max.width)
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}));
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}
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// TODO: layout: isValidForLayout() call should not be necessary if INFINITY is used
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if (!isinf(constrainedSize.max.height) && ASPointsAreValidForLayout(constrainedSize.max.width)) {
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sizeOptions.push_back(ASSizeRangeClamp(constrainedSize, {
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ASFloorPixelValue(constrainedSize.max.height / _ratio),
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constrainedSize.max.height
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}));
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}
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// Choose the size closest to the desired ratio.
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const auto &bestSize = std::max_element(sizeOptions.begin(), sizeOptions.end(), [&](const CGSize &a, const CGSize &b){
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return std::fabs((a.height / a.width) - _ratio) > std::fabs((b.height / b.width) - _ratio);
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});
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// If there is no max size in *either* dimension, we can't apply the ratio, so just pass our size range through.
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const ASSizeRange childRange = (bestSize == sizeOptions.end()) ? constrainedSize : ASSizeRangeMake(*bestSize, *bestSize);
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const CGSize parentSize = (bestSize == sizeOptions.end()) ? ASLayoutableParentSizeUndefined : *bestSize;
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ASLayout *sublayout = [self.child layoutThatFits:childRange parentSize:parentSize];
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sublayout.position = CGPointZero;
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return [ASLayout layoutWithLayoutable:self size:sublayout.size sublayouts:@[sublayout]];
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}
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@end
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@implementation ASRatioLayoutSpec (Debugging)
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#pragma mark - ASLayoutableAsciiArtProtocol
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- (NSString *)asciiArtName
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{
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return [NSString stringWithFormat:@"%@ (%.1f)", NSStringFromClass([self class]), self.ratio];
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}
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@end
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