mirror of
https://github.com/Instagram/IGListKit
synced 2026-05-09 18:40:52 +00:00
e4c60650f2
Summary: Pull Request resolved: https://github.com/Instagram/IGListKit/pull/1377 This splits the diffing-only components from `IGListKit` out into a separate library, `IGListDiffKit`, allowing them to be used independently of the rest of `IGListKit`. We've found that the diffing components of the library are useful independently of the rest of the `UICollectionView` infrastructure, and separating the libraries allows apps to take advantage of those components without paying the full binary size cost of `IGListKit`. The diffing components are available as a subspec in Cocoapods, and as an independent framework in Carthage and direct Xcode project import (i.e. Git submodules). This is a breaking change, necessitating a major version bump, although it should have only minor impact for projects using the umbrella header `IGListKit.h`, as that header continues to import the diffing utilities. In particular, for a project using Cocoapods and importing `IGListKit.h`, there should be no code changes required. Reviewed By: calimarkus Differential Revision: D18114249 fbshipit-source-id: 363b5a427e32800bbc6e82f897230963b4167245
91 lines
3.6 KiB
Objective-C
91 lines
3.6 KiB
Objective-C
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#import "IGListIndexPathResult.h"
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#import "IGListIndexPathResultInternal.h"
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@implementation IGListIndexPathResult {
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NSMapTable<id<NSObject>, NSIndexPath *> *_oldIndexPathMap;
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NSMapTable<id<NSObject>, NSIndexPath *> *_newIndexPathMap;
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}
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- (instancetype)initWithInserts:(NSArray<NSIndexPath *> *)inserts
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deletes:(NSArray<NSIndexPath *> *)deletes
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updates:(NSArray<NSIndexPath *> *)updates
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moves:(NSArray<IGListMoveIndexPath *> *)moves
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oldIndexPathMap:(NSMapTable<id<NSObject>, NSIndexPath *> *)oldIndexPathMap
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newIndexPathMap:(NSMapTable<id<NSObject>, NSIndexPath *> *)newIndexPathMap {
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if (self = [super init]) {
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_inserts = inserts;
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_deletes = deletes;
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_updates = updates;
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_moves = moves;
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_oldIndexPathMap = oldIndexPathMap;
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_newIndexPathMap = newIndexPathMap;
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}
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return self;
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}
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- (BOOL)hasChanges {
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return self.changeCount > 0;
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}
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- (NSInteger)changeCount {
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return self.inserts.count + self.deletes.count + self.updates.count + self.moves.count;
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}
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- (IGListIndexPathResult *)resultForBatchUpdates {
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NSMutableSet<NSIndexPath *> *deletes = [NSMutableSet setWithArray:self.deletes];
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NSMutableSet<NSIndexPath *> *inserts = [NSMutableSet setWithArray:self.inserts];
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NSMutableSet<NSIndexPath *> *filteredUpdates = [NSMutableSet setWithArray:self.updates];
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NSArray<IGListMoveIndexPath *> *moves = self.moves;
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NSMutableArray<IGListMoveIndexPath *> *filteredMoves = [moves mutableCopy];
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// convert move+update to delete+insert, respecting the from/to of the move
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const NSInteger moveCount = moves.count;
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for (NSInteger i = moveCount - 1; i >= 0; i--) {
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IGListMoveIndexPath *move = moves[i];
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if ([filteredUpdates containsObject:move.from]) {
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[filteredMoves removeObjectAtIndex:i];
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[filteredUpdates removeObject:move.from];
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[deletes addObject:move.from];
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[inserts addObject:move.to];
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}
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}
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// iterate all new identifiers. if its index is updated, delete from the old index and insert the new index
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for (id<NSObject> key in [_oldIndexPathMap keyEnumerator]) {
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NSIndexPath *indexPath = [_oldIndexPathMap objectForKey:key];
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if ([filteredUpdates containsObject:indexPath]) {
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[deletes addObject:indexPath];
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[inserts addObject:(id)[_newIndexPathMap objectForKey:key]];
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}
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}
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return [[IGListIndexPathResult alloc] initWithInserts:[inserts allObjects]
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deletes:[deletes allObjects]
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updates:[NSArray new]
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moves:filteredMoves
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oldIndexPathMap:_oldIndexPathMap
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newIndexPathMap:_newIndexPathMap];
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}
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- (NSIndexPath *)oldIndexPathForIdentifier:(id<NSObject>)identifier {
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return [_oldIndexPathMap objectForKey:identifier];
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}
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- (NSIndexPath *)newIndexPathForIdentifier:(id<NSObject>)identifier {
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return [_newIndexPathMap objectForKey:identifier];
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}
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- (NSString *)description {
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return [NSString stringWithFormat:@"<%@ %p; %lu inserts; %lu deletes; %lu updates; %lu moves>",
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NSStringFromClass(self.class), self, (unsigned long)self.inserts.count, (unsigned long)self.deletes.count, (unsigned long)self.updates.count, (unsigned long)self.moves.count];
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}
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@end
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