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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.
81 lines
3.2 KiB
Plaintext
81 lines
3.2 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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#import "ASLayoutNodeSubclass.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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ASLayoutNode *_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:(ASLayoutNode *)child
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size:(ASLayoutNodeSize)size
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{
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ASCenterLayoutNode *n = [super newWithSize:size];
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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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- (ASLayout *)computeLayoutThatFits:(ASSizeRange)constrainedSize
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{
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// If we have a finite size in any direction, pass this so that the child can
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// resolve percentages agains it. Otherwise pass kASLayoutNodeParentDimensionUndefined
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// as the size will depend on the content
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CGSize size = {
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isinf(constrainedSize.max.width) ? kASLayoutNodeParentDimensionUndefined : constrainedSize.max.width,
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isinf(constrainedSize.max.height) ? kASLayoutNodeParentDimensionUndefined : 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 layoutThatFits:ASSizeRangeMake(minChildSize, constrainedSize.max) parentSize:size];
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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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const CGPoint childPosition = {
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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 newWithNode:self
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size:size
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children:@[[ASLayoutChild newWithPosition:childPosition layout:childLayout]]];
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}
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@end
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