mirror of
https://github.com/Instagram/IGListKit
synced 2026-04-21 21:47:34 +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
93 lines
3.5 KiB
Objective-C
93 lines
3.5 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 "IGListIndexSetResult.h"
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#import "IGListIndexSetResultInternal.h"
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@implementation IGListIndexSetResult {
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NSMapTable<id<NSObject>, NSNumber *> *_oldIndexMap;
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NSMapTable<id<NSObject>, NSNumber *> *_newIndexMap;
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}
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- (instancetype)initWithInserts:(NSIndexSet *)inserts
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deletes:(NSIndexSet *)deletes
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updates:(NSIndexSet *)updates
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moves:(NSArray<IGListMoveIndex *> *)moves
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oldIndexMap:(NSMapTable<id<NSObject>, NSNumber *> *)oldIndexMap
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newIndexMap:(NSMapTable<id<NSObject>, NSNumber *> *)newIndexMap {
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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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_oldIndexMap = oldIndexMap;
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_newIndexMap = newIndexMap;
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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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- (IGListIndexSetResult *)resultForBatchUpdates {
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NSMutableIndexSet *deletes = [self.deletes mutableCopy];
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NSMutableIndexSet *inserts = [self.inserts mutableCopy];
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NSMutableIndexSet *filteredUpdates = [self.updates mutableCopy];
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NSArray<IGListMoveIndex *> *moves = self.moves;
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NSMutableArray<IGListMoveIndex *> *filteredMoves = [moves mutableCopy];
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// convert all update+move to delete+insert
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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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IGListMoveIndex *move = moves[i];
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if ([filteredUpdates containsIndex:move.from]) {
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[filteredMoves removeObjectAtIndex:i];
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[filteredUpdates removeIndex:move.from];
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[deletes addIndex:move.from];
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[inserts addIndex: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 [_oldIndexMap keyEnumerator]) {
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const NSInteger index = [[_oldIndexMap objectForKey:key] integerValue];
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if ([filteredUpdates containsIndex:index]) {
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[deletes addIndex:index];
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[inserts addIndex:[[_newIndexMap objectForKey:key] integerValue]];
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}
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}
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return [[IGListIndexSetResult alloc] initWithInserts:inserts
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deletes:deletes
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updates:[NSIndexSet new]
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moves:filteredMoves
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oldIndexMap:_oldIndexMap
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newIndexMap:_newIndexMap];
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}
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- (NSInteger)oldIndexForIdentifier:(id<NSObject>)identifier {
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NSNumber *index = [_oldIndexMap objectForKey:identifier];
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return index == nil ? NSNotFound : [index integerValue];
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}
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- (NSInteger)newIndexForIdentifier:(id<NSObject>)identifier {
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NSNumber *index = [_newIndexMap objectForKey:identifier];
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return index == nil ? NSNotFound : [index integerValue];
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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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