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ASLayoutFlatteningTests.m
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//
// ASLayoutFlatteningTests.m
// Texture
//
// Copyright (c) 2017-present, Pinterest, Inc. All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
#import <XCTest/XCTest.h>
#import <AsyncDisplayKit/ASDisplayNode.h>
#import <AsyncDisplayKit/ASLayout.h>
#import <AsyncDisplayKit/ASLayoutSpec.h>
@interface ASLayoutFlatteningTests : XCTestCase
@end
@implementation ASLayoutFlatteningTests
static ASLayout *layoutWithCustomPosition(CGPoint position, id<ASLayoutElement> element, NSArray<ASLayout *> *sublayouts)
{
return [ASLayout layoutWithLayoutElement:element
size:CGSizeMake(100, 100)
position:position
sublayouts:sublayouts];
}
static ASLayout *layout(id<ASLayoutElement> element, NSArray<ASLayout *> *sublayouts)
{
return layoutWithCustomPosition(CGPointZero, element, sublayouts);
}
- (void)testThatFlattenedLayoutContainsOnlyDirectSubnodesInValidOrder
{
ASLayout *flattenedLayout;
@autoreleasepool {
NSMutableArray<ASDisplayNode *> *subnodes = [NSMutableArray array];
NSMutableArray<ASLayoutSpec *> *layoutSpecs = [NSMutableArray array];
NSMutableArray<ASDisplayNode *> *indirectSubnodes = [NSMutableArray array];
ASDisplayNode *(^subnode)(void) = ^ASDisplayNode *() { [subnodes addObject:[[ASDisplayNode alloc] init]]; return [subnodes lastObject]; };
ASLayoutSpec *(^layoutSpec)(void) = ^ASLayoutSpec *() { [layoutSpecs addObject:[[ASLayoutSpec alloc] init]]; return [layoutSpecs lastObject]; };
ASDisplayNode *(^indirectSubnode)(void) = ^ASDisplayNode *() { [indirectSubnodes addObject:[[ASDisplayNode alloc] init]]; return [indirectSubnodes lastObject]; };
NSArray<ASLayout *> *sublayouts = @[
layout(subnode(), @[
layout(indirectSubnode(), @[]),
]),
layout(layoutSpec(), @[
layout(subnode(), @[]),
layout(layoutSpec(), @[
layout(layoutSpec(), @[]),
layout(subnode(), @[]),
]),
layout(layoutSpec(), @[]),
]),
layout(layoutSpec(), @[
layout(subnode(), @[
layout(indirectSubnode(), @[]),
layout(indirectSubnode(), @[
layout(indirectSubnode(), @[])
]),
])
]),
layout(subnode(), @[]),
];
ASDisplayNode *rootNode = [[ASDisplayNode alloc] init];
ASLayout *originalLayout = [ASLayout layoutWithLayoutElement:rootNode
size:CGSizeMake(1000, 1000)
sublayouts:sublayouts];
flattenedLayout = [originalLayout filteredNodeLayoutTree];
NSArray<ASLayout *> *flattenedSublayouts = flattenedLayout.sublayouts;
NSUInteger sublayoutsCount = flattenedSublayouts.count;
XCTAssertEqualObjects(originalLayout.layoutElement, flattenedLayout.layoutElement, @"The root node should be reserved");
XCTAssertTrue(ASPointIsNull(flattenedLayout.position), @"Position of the root layout should be null");
XCTAssertEqual(subnodes.count, sublayoutsCount, @"Flattened layout should only contain direct subnodes");
for (int i = 0; i < sublayoutsCount; i++) {
XCTAssertEqualObjects(subnodes[i], flattenedSublayouts[i].layoutElement, @"Sublayouts should be in correct order (flattened in DFS fashion)");
}
}
for (ASLayout *sublayout in flattenedLayout.sublayouts) {
XCTAssertNotNil(sublayout.layoutElement, @"Sublayout elements should be retained");
XCTAssertEqual(0, sublayout.sublayouts.count, @"Sublayouts should not have their own sublayouts");
}
}
#pragma mark - Test reusing ASLayouts while flattening
- (void)testThatLayoutWithNonNullPositionIsNotReused
{
ASDisplayNode *rootNode = [[ASDisplayNode alloc] init];
ASLayout *originalLayout = layoutWithCustomPosition(CGPointMake(10, 10), rootNode, @[]);
ASLayout *flattenedLayout = [originalLayout filteredNodeLayoutTree];
XCTAssertNotEqualObjects(originalLayout, flattenedLayout, "@Layout should be reused");
XCTAssertTrue(ASPointIsNull(flattenedLayout.position), @"Position of a root layout should be null");
}
- (void)testThatLayoutWithNullPositionAndNoSublayoutIsReused
{
ASDisplayNode *rootNode = [[ASDisplayNode alloc] init];
ASLayout *originalLayout = layoutWithCustomPosition(ASPointNull, rootNode, @[]);
ASLayout *flattenedLayout = [originalLayout filteredNodeLayoutTree];
XCTAssertEqualObjects(originalLayout, flattenedLayout, "@Layout should be reused");
XCTAssertTrue(ASPointIsNull(flattenedLayout.position), @"Position of a root layout should be null");
}
- (void)testThatLayoutWithNullPositionAndFlattenedNodeSublayoutsIsReused
{
ASLayout *flattenedLayout;
@autoreleasepool {
ASDisplayNode *rootNode = [[ASDisplayNode alloc] init];
NSMutableArray<ASDisplayNode *> *subnodes = [NSMutableArray array];
ASDisplayNode *(^subnode)(void) = ^ASDisplayNode *() { [subnodes addObject:[[ASDisplayNode alloc] init]]; return [subnodes lastObject]; };
ASLayout *originalLayout = layoutWithCustomPosition(ASPointNull,
rootNode,
@[
layoutWithCustomPosition(CGPointMake(10, 10), subnode(), @[]),
layoutWithCustomPosition(CGPointMake(20, 20), subnode(), @[]),
layoutWithCustomPosition(CGPointMake(30, 30), subnode(), @[]),
]);
flattenedLayout = [originalLayout filteredNodeLayoutTree];
XCTAssertEqualObjects(originalLayout, flattenedLayout, "@Layout should be reused");
XCTAssertTrue(ASPointIsNull(flattenedLayout.position), @"Position of the root layout should be null");
}
for (ASLayout *sublayout in flattenedLayout.sublayouts) {
XCTAssertNotNil(sublayout.layoutElement, @"Sublayout elements should be retained");
XCTAssertEqual(0, sublayout.sublayouts.count, @"Sublayouts should not have their own sublayouts");
}
}
- (void)testThatLayoutWithNullPositionAndUnflattenedSublayoutsIsNotReused
{
ASLayout *flattenedLayout;
@autoreleasepool {
ASDisplayNode *rootNode = [[ASDisplayNode alloc] init];
NSMutableArray<ASDisplayNode *> *subnodes = [NSMutableArray array];
NSMutableArray<ASLayoutSpec *> *layoutSpecs = [NSMutableArray array];
NSMutableArray<ASDisplayNode *> *indirectSubnodes = [NSMutableArray array];
NSMutableArray<ASLayout *> *reusedLayouts = [NSMutableArray array];
ASDisplayNode *(^subnode)(void) = ^ASDisplayNode *() { [subnodes addObject:[[ASDisplayNode alloc] init]]; return [subnodes lastObject]; };
ASLayoutSpec *(^layoutSpec)(void) = ^ASLayoutSpec *() { [layoutSpecs addObject:[[ASLayoutSpec alloc] init]]; return [layoutSpecs lastObject]; };
ASDisplayNode *(^indirectSubnode)(void) = ^ASDisplayNode *() { [indirectSubnodes addObject:[[ASDisplayNode alloc] init]]; return [indirectSubnodes lastObject]; };
ASLayout *(^reusedLayout)(ASDisplayNode *) = ^ASLayout *(ASDisplayNode *subnode) { [reusedLayouts addObject:layout(subnode, @[])]; return [reusedLayouts lastObject]; };
/*
* Layouts with sublayouts of both nodes and layout specs should not be reused.
* However, all flattened node sublayouts with valid position should be reused.
*/
ASLayout *originalLayout = layoutWithCustomPosition(ASPointNull,
rootNode,
@[
reusedLayout(subnode()),
// The 2 node sublayouts below should be reused although they are in a layout spec sublayout.
// That is because each of them have an absolute position of zero.
// This case can happen, for example, as the result of a background/overlay layout spec.
layout(layoutSpec(), @[
reusedLayout(subnode()),
reusedLayout(subnode())
]),
layout(subnode(), @[
layout(layoutSpec(), @[])
]),
layout(subnode(), @[
layout(indirectSubnode(), @[])
]),
layoutWithCustomPosition(CGPointMake(10, 10), subnode(), @[]),
// The 2 node sublayouts below shouldn't be reused because they have non-zero absolute positions.
layoutWithCustomPosition(CGPointMake(20, 20), layoutSpec(), @[
layout(subnode(), @[]),
layout(subnode(), @[])
]),
]);
flattenedLayout = [originalLayout filteredNodeLayoutTree];
NSArray<ASLayout *> *flattenedSublayouts = flattenedLayout.sublayouts;
NSUInteger sublayoutsCount = flattenedSublayouts.count;
XCTAssertNotEqualObjects(originalLayout, flattenedLayout, @"Original layout should not be reused");
XCTAssertEqualObjects(originalLayout.layoutElement, flattenedLayout.layoutElement, @"The root node should be reserved");
XCTAssertTrue(ASPointIsNull(flattenedLayout.position), @"Position of the root layout should be null");
XCTAssertTrue(reusedLayouts.count <= sublayoutsCount, @"Some sublayouts can't be reused");
XCTAssertEqual(subnodes.count, sublayoutsCount, @"Flattened layout should only contain direct subnodes");
int numOfActualReusedLayouts = 0;
for (int i = 0; i < sublayoutsCount; i++) {
ASLayout *sublayout = flattenedSublayouts[i];
XCTAssertEqualObjects(subnodes[i], sublayout.layoutElement, @"Sublayouts should be in correct order (flattened in DFS fashion)");
if ([reusedLayouts containsObject:sublayout]) {
numOfActualReusedLayouts++;
}
}
XCTAssertEqual(numOfActualReusedLayouts, reusedLayouts.count, @"Should reuse all layouts that can be reused");
}
for (ASLayout *sublayout in flattenedLayout.sublayouts) {
XCTAssertNotNil(sublayout.layoutElement, @"Sublayout elements should be retained");
XCTAssertEqual(0, sublayout.sublayouts.count, @"Sublayouts should not have their own sublayouts");
}
}
@end