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* [License] Simplify the Texture license to be pure Apache 2 (removing ASDK-Licenses) With permission of the Facebook Open Source team, we are simplifying the Texture license so that clients can rely on the Apache 2 terms that most of Texture is already covered by. This means that code originally forked from AsyncDisplayKit will be re-licensed from "BSD 3-clause + PATENTS v2" to Apache 2 without a PATENTS file. After getting confirmation that the updates to these core files look good, we'll propagate this new license header to all files (in this same PR) and get sign-off from all parties before landing. * [License] Update all Texture source files to be pure Apache 2. * Changelog entry for Apache 2 license update. * Revert "[License] Update all Texture source files to be pure Apache 2." This reverts commit ffa0fbbba9717d871dd16c4b07539f2f8208fc2b. * [License] Update all Texture source files to be pure Apache 2, maintaining copyrights. * [License] Update CONTRIBUTING, README, Podspec & Dangerfile.
74 lines
2.1 KiB
Objective-C
74 lines
2.1 KiB
Objective-C
//
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// ASCollectionSectionController.m
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// Texture
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//
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// Copyright (c) Pinterest, Inc. All rights reserved.
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// Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0
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//
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#import "ASCollectionSectionController.h"
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#import <AsyncDisplayKit/AsyncDisplayKit.h>
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@interface ASCollectionSectionController ()
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@property (nonatomic, strong, readonly) dispatch_queue_t diffingQueue;
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/// The items that have been diffed and are waiting to be submitted to the collection view.
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/// Should always be accessed on the diffing queue, and should never be accessed
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/// before the initial items are read (in -numberOfItems).
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@property (nonatomic, copy) NSArray *pendingItems;
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@property (nonatomic) BOOL initialItemsRead;
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@end
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@implementation ASCollectionSectionController
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@synthesize diffingQueue = _diffingQueue;
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- (NSInteger)numberOfItems
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{
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if (_initialItemsRead == NO) {
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_pendingItems = self.items;
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_initialItemsRead = YES;
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}
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return self.items.count;
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}
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- (dispatch_queue_t)diffingQueue
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{
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if (_diffingQueue == nil) {
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_diffingQueue = dispatch_queue_create("ASCollectionSectionController.diffingQueue", DISPATCH_QUEUE_SERIAL);
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}
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return _diffingQueue;
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}
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- (void)setItems:(NSArray *)newItems animated:(BOOL)animated completion:(void(^)())completion
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{
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ASDisplayNodeAssertMainThread();
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newItems = [newItems copy];
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if (!self.initialItemsRead) {
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_items = newItems;
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if (completion) {
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completion();
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}
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return;
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}
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dispatch_async(self.diffingQueue, ^{
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IGListIndexSetResult *result = IGListDiff(self.pendingItems, newItems, IGListDiffPointerPersonality);
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self.pendingItems = newItems;
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dispatch_async(dispatch_get_main_queue(), ^{
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id<IGListCollectionContext> ctx = self.collectionContext;
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[ctx performBatchAnimated:animated updates:^(id<IGListBatchContext> _Nonnull batchContext) {
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[batchContext insertInSectionController:(id)self atIndexes:result.inserts];
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[batchContext deleteInSectionController:(id)self atIndexes:result.deletes];
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_items = newItems;
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} completion:^(BOOL finished) {
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if (completion) {
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completion();
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}
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}];
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});
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});
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}
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@end
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