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79 lines
2.7 KiB
Plaintext
79 lines
2.7 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 "ASCenterLayoutNode.h"
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#import "ASInternalHelpers.h"
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@implementation ASCenterLayoutNode
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{
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ASCenterLayoutNodeCenteringOptions _centeringOptions;
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ASCenterLayoutNodeSizingOptions _sizingOptions;
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id<ASLayoutable> _child;
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}
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+ (instancetype)newWithCenteringOptions:(ASCenterLayoutNodeCenteringOptions)centeringOptions
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sizingOptions:(ASCenterLayoutNodeSizingOptions)sizingOptions
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child:(id<ASLayoutable>)child
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{
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ASCenterLayoutNode *n = [super new];
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if (n) {
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n->_centeringOptions = centeringOptions;
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n->_sizingOptions = sizingOptions;
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n->_child = child;
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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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- (ASLayout *)calculateLayoutThatFits:(ASSizeRange)constrainedSize
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{
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CGSize size = {
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constrainedSize.max.width,
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constrainedSize.max.height
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};
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// Layout the child
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const CGSize minChildSize = {
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(_centeringOptions & ASCenterLayoutNodeCenteringX) != 0 ? 0 : constrainedSize.min.width,
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(_centeringOptions & ASCenterLayoutNodeCenteringY) != 0 ? 0 : constrainedSize.min.height,
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};
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ASLayout *childLayout = [_child calculateLayoutThatFits:ASSizeRangeMake(minChildSize, constrainedSize.max)];
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// If we have an undetermined height or width, use the child size to define the layout
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// size
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size = ASSizeRangeClamp(constrainedSize, {
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isnan(size.width) ? childLayout.size.width : size.width,
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isnan(size.height) ? childLayout.size.height : size.height
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});
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// If minimum size options are set, attempt to shrink the size to the size of the child
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size = ASSizeRangeClamp(constrainedSize, {
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MIN(size.width, (_sizingOptions & ASCenterLayoutNodeSizingOptionMinimumX) != 0 ? childLayout.size.width : size.width),
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MIN(size.height, (_sizingOptions & ASCenterLayoutNodeSizingOptionMinimumY) != 0 ? childLayout.size.height : size.height)
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});
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// Compute the centered postion for the child
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BOOL shouldCenterAlongX = (_centeringOptions & ASCenterLayoutNodeCenteringX);
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BOOL shouldCenterAlongY = (_centeringOptions & ASCenterLayoutNodeCenteringY);
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childLayout.position = {
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ASRoundPixelValue(shouldCenterAlongX ? (size.width - childLayout.size.width) * 0.5f : 0),
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ASRoundPixelValue(shouldCenterAlongY ? (size.height - childLayout.size.height) * 0.5f : 0)
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};
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return [ASLayout newWithLayoutableObject:self size:size children:@[childLayout]];
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}
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@end
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