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https://github.com/Swiftgram/Telegram-iOS.git
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f8531f467d
- The code is forked from LayoutComponents in ComponentKit. - Public interfaces are modified to be strictly Objective-C. As a result, users are not forced to switch to Objective-C++, the linker can happily compile and Swift fans can continue using the mighty ASDK.
95 lines
3.0 KiB
Plaintext
95 lines
3.0 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 "ASLayoutNode.h"
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#import "ASLayoutNodeSubclass.h"
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#import "ASAssert.h"
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#import "ASBaseDefines.h"
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#import "ASInternalHelpers.h"
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#import "ASLayout.h"
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CGFloat const kASLayoutNodeParentDimensionUndefined = NAN;
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CGSize const kASLayoutNodeParentSizeUndefined = {kASLayoutNodeParentDimensionUndefined, kASLayoutNodeParentDimensionUndefined};
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@implementation ASLayoutNode
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{
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ASLayoutNodeSize _size;
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}
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#if DEBUG
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+ (void)initialize
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{
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ASDisplayNodeConditionalAssert(self != [ASLayoutNode class],
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!ASSubclassOverridesSelector([ASLayoutNode class], self, @selector(layoutThatFits:parentSize:)),
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@"%@ overrides -layoutThatFits:parentSize: which is not allowed. Override -computeLayoutThatFits: "
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"or -computeLayoutThatFits:restrictedToSize:relativeToParentSize: instead.",
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NSStringFromClass(self));
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}
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#endif
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+ (instancetype)newWithSize:(ASLayoutNodeSize)size
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{
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return [[self alloc] initWithLayoutNodeSize:size];
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}
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+ (instancetype)new
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{
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return [self newWithSize:{}];
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}
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- (instancetype)init
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{
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ASDISPLAYNODE_NOT_DESIGNATED_INITIALIZER();
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}
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- (instancetype)initWithLayoutNodeSize:(ASLayoutNodeSize)size
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{
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if (self = [super init]) {
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_size = size;
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}
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return self;
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}
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#pragma mark - Layout
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- (ASLayout *)layoutThatFits:(ASSizeRange)constrainedSize parentSize:(CGSize)parentSize
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{
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ASLayout *layout = [self computeLayoutThatFits:constrainedSize
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restrictedToSize:_size
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relativeToParentSize:parentSize];
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ASDisplayNodeAssert(layout.node == self, @"Layout computed by %@ should return self as node, but returned %@",
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[self class], [layout.node class]);
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ASSizeRange resolvedRange = ASSizeRangeIntersect(constrainedSize, ASLayoutNodeSizeResolve(_size, parentSize));
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ASDisplayNodeAssert(layout.size.width <= resolvedRange.max.width
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&& layout.size.width >= resolvedRange.min.width
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&& layout.size.height <= resolvedRange.max.height
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&& layout.size.height >= resolvedRange.min.height,
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@"Computed size %@ for %@ does not fall within constrained size %@",
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NSStringFromCGSize(layout.size), [self class], NSStringFromASSizeRange(resolvedRange));
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return layout;
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}
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- (ASLayout *)computeLayoutThatFits:(ASSizeRange)constrainedSize
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restrictedToSize:(ASLayoutNodeSize)size
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relativeToParentSize:(CGSize)parentSize
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{
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ASSizeRange resolvedRange = ASSizeRangeIntersect(constrainedSize, ASLayoutNodeSizeResolve(_size, parentSize));
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return [self computeLayoutThatFits:resolvedRange];
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}
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- (ASLayout *)computeLayoutThatFits:(ASSizeRange)constrainedSize
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{
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return [ASLayout newWithNode:self size:constrainedSize.min];
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}
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@end
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