mirror of
https://github.com/Swiftgram/Telegram-iOS.git
synced 2025-09-03 19:30:09 +00:00
51f1ed819f
- constrainedSizeForCalculatedLayout is of type ASSizeRange. - calculatedLayout is better explained. - Since ASLayout is cached and reused, its position property is mutable.
95 lines
3.0 KiB
Plaintext
95 lines
3.0 KiB
Plaintext
/*
|
|
* Copyright (c) 2014-present, Facebook, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This source code is licensed under the BSD-style license found in the
|
|
* LICENSE file in the root directory of this source tree. An additional grant
|
|
* of patent rights can be found in the PATENTS file in the same directory.
|
|
*
|
|
*/
|
|
|
|
#import "ASLayout.h"
|
|
#import "ASAssert.h"
|
|
#import "ASLayoutSpecUtilities.h"
|
|
#import <stack>
|
|
|
|
CGPoint const CGPointNull = {NAN, NAN};
|
|
|
|
extern BOOL CGPointIsNull(CGPoint point)
|
|
{
|
|
return isnan(point.x) && isnan(point.y);
|
|
}
|
|
|
|
@implementation ASLayout
|
|
|
|
+ (instancetype)newWithLayoutableObject:(id<ASLayoutable>)layoutableObject
|
|
size:(CGSize)size
|
|
position:(CGPoint)position
|
|
sublayouts:(NSArray *)sublayouts
|
|
{
|
|
ASDisplayNodeAssert(layoutableObject, @"layoutableObject is required.");
|
|
for (ASLayout *sublayout in sublayouts) {
|
|
ASDisplayNodeAssert(!CGPointIsNull(sublayout.position), @"Invalid position is not allowed in sublayout.");
|
|
}
|
|
|
|
ASLayout *l = [super new];
|
|
if (l) {
|
|
l->_layoutableObject = layoutableObject;
|
|
l->_size = size;
|
|
l->_position = position;
|
|
l->_sublayouts = [sublayouts copy];
|
|
}
|
|
return l;
|
|
}
|
|
|
|
+ (instancetype)newWithLayoutableObject:(id<ASLayoutable>)layoutableObject
|
|
size:(CGSize)size
|
|
sublayouts:(NSArray *)sublayouts
|
|
{
|
|
return [self newWithLayoutableObject:layoutableObject size:size position:CGPointNull sublayouts:sublayouts];
|
|
}
|
|
|
|
+ (instancetype)newWithLayoutableObject:(id<ASLayoutable>)layoutableObject size:(CGSize)size
|
|
{
|
|
return [self newWithLayoutableObject:layoutableObject size:size sublayouts:nil];
|
|
}
|
|
|
|
- (ASLayout *)flattenedLayoutUsingPredicateBlock:(BOOL (^)(ASLayout *))predicateBlock
|
|
{
|
|
NSMutableArray *flattenedSublayouts = [NSMutableArray array];
|
|
|
|
struct Context {
|
|
ASLayout *layout;
|
|
CGPoint absolutePosition;
|
|
BOOL visited;
|
|
};
|
|
|
|
// Stack of Contexts, used to keep track of sublayouts while traversing this layout in a DFS fashion.
|
|
std::stack<Context> stack;
|
|
stack.push({self, CGPointMake(0, 0), NO});
|
|
|
|
while (!stack.empty()) {
|
|
Context &context = stack.top();
|
|
if (context.visited) {
|
|
stack.pop();
|
|
} else {
|
|
context.visited = YES;
|
|
|
|
if (predicateBlock(context.layout)) {
|
|
[flattenedSublayouts addObject:[ASLayout newWithLayoutableObject:context.layout.layoutableObject
|
|
size:context.layout.size
|
|
position:context.absolutePosition
|
|
sublayouts:nil]];
|
|
}
|
|
|
|
for (ASLayout *sublayout in context.layout.sublayouts) {
|
|
stack.push({sublayout, context.absolutePosition + sublayout.position, NO});
|
|
}
|
|
}
|
|
}
|
|
|
|
return [ASLayout newWithLayoutableObject:_layoutableObject size:_size sublayouts:flattenedSublayouts];
|
|
}
|
|
|
|
@end
|