mirror of
https://github.com/Swiftgram/Telegram-iOS.git
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64e2323a4e
- ASLayoutNode no longer has 'size' constraint during its initialization.. - ASLayoutNode no longer needs parentSize to calculate its layout.
109 lines
3.3 KiB
Plaintext
109 lines
3.3 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 "ASInsetLayoutNode.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 "ASLayoutNodeSubclass.h"
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@interface ASInsetLayoutNode ()
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{
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UIEdgeInsets _insets;
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ASLayoutNode *_node;
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}
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@end
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/* Returns f if f is finite, substitute otherwise */
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static CGFloat finite(CGFloat f, CGFloat substitute)
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{
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return isinf(f) ? substitute : f;
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}
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/* Returns f if f is finite, 0 otherwise */
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static CGFloat finiteOrZero(CGFloat f)
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{
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return finite(f, 0);
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}
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/* Returns the inset required to center 'inner' in 'outer' */
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static CGFloat centerInset(CGFloat outer, CGFloat inner)
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{
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return ASRoundPixelValue((outer - inner) / 2);
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}
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@implementation ASInsetLayoutNode
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+ (instancetype)newWithInsets:(UIEdgeInsets)insets node:(ASLayoutNode *)node
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{
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if (node == nil) {
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return nil;
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}
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ASInsetLayoutNode *n = [super new];
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if (n) {
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n->_insets = insets;
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n->_node = node;
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}
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return n;
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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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/**
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Inset will compute a new constrained size for it's child after applying insets and re-positioning
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the child to respect the inset.
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*/
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- (ASLayout *)computeLayoutThatFits:(ASSizeRange)constrainedSize
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{
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const CGFloat insetsX = (finiteOrZero(_insets.left) + finiteOrZero(_insets.right));
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const CGFloat insetsY = (finiteOrZero(_insets.top) + finiteOrZero(_insets.bottom));
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// if either x-axis inset is infinite, let child be intrinsic width
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const CGFloat minWidth = (isinf(_insets.left) || isinf(_insets.right)) ? 0 : constrainedSize.min.width;
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// if either y-axis inset is infinite, let child be intrinsic height
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const CGFloat minHeight = (isinf(_insets.top) || isinf(_insets.bottom)) ? 0 : constrainedSize.min.height;
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const ASSizeRange insetConstrainedSize = {
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{
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MAX(0, minWidth - insetsX),
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MAX(0, minHeight - insetsY),
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},
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{
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MAX(0, constrainedSize.max.width - insetsX),
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MAX(0, constrainedSize.max.height - insetsY),
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}
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};
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ASLayout *childLayout = [_node computeLayoutThatFits:insetConstrainedSize];
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const CGSize computedSize = ASSizeRangeClamp(constrainedSize, {
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finite(childLayout.size.width + _insets.left + _insets.right, constrainedSize.max.width),
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finite(childLayout.size.height + _insets.top + _insets.bottom, constrainedSize.max.height),
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});
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const CGFloat x = finite(_insets.left, constrainedSize.max.width -
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(finite(_insets.right,
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centerInset(constrainedSize.max.width, childLayout.size.width)) + childLayout.size.width));
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const CGFloat y = finite(_insets.top,
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constrainedSize.max.height -
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(finite(_insets.bottom,
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centerInset(constrainedSize.max.height, childLayout.size.height)) + childLayout.size.height));
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return [ASLayout newWithNode:self
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size:computedSize
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children:@[[ASLayoutChild newWithPosition:{x,y} layout:childLayout]]];
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}
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@end
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