mirror of
https://github.com/Instagram/IGListKit
synced 2026-05-14 12:58:34 +00:00
2074eba50e
Summary: - [x] All tests pass. Demo project builds and runs. No breaking changes that I am aware of. Closes https://github.com/Instagram/IGListKit/pull/440 Differential Revision: D4448496 Pulled By: rnystrom fbshipit-source-id: 9ad9bc3734b605ceab25bf6cdf993568aa6561c1
89 lines
3.7 KiB
Objective-C
89 lines
3.7 KiB
Objective-C
/**
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* Copyright (c) 2016-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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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 copy];
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_deletes = [deletes copy];
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_updates = [updates copy];
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_moves = [moves copy];
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_oldIndexPathMap = [oldIndexPathMap copy];
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_newIndexPathMap = [newIndexPathMap copy];
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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.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; %zi inserts; %zi deletes; %zi updates; %zi moves>",
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NSStringFromClass(self.class), self, self.inserts.count, self.deletes.count, self.updates.count, self.moves.count];
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}
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@end
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