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_ASHierarchyChangeSet: Exclude item-level changes that are redundant with section-level changes

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This commit is contained in:
Adlai Holler
2015-11-25 17:18:58 -08:00
parent b5e19a24a9
commit 4bfdd82568
2 changed files with 23 additions and 25 deletions
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7
AsyncDisplayKit/Private/_ASHierarchyChangeSet.h
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@@ -34,13 +34,6 @@ typedef NS_ENUM(NSInteger, _ASHierarchyChangeType) {
@interface _ASHierarchyChangeSet : NSObject
@property (nonatomic, strong, readonly) NSIndexSet *deletedSections;
@property (nonatomic, strong, readonly) NSIndexSet *insertedSections;
@property (nonatomic, strong, readonly) NSIndexSet *reloadedSections;
@property (nonatomic, strong, readonly) NSArray *insertedItems;
@property (nonatomic, strong, readonly) NSArray *deletedItems;
@property (nonatomic, strong, readonly) NSArray *reloadedItems;
@property (nonatomic, readonly) BOOL completed;
/// Call this once the change set has been constructed to prevent future modifications to the changeset. Calling this more than once is a programmer error.

41
AsyncDisplayKit/Private/_ASHierarchyChangeSet.m
View File

@@ -17,6 +17,9 @@
Assumes: `changes` is [_ASHierarchySectionChange] all with the same changeType
*/
+ (void)sortAndCoalesceChanges:(NSMutableArray *)changes;
/// Returns all the indexes from all the `indexSet`s of the given `_ASHierarchySectionChange` objects.
+ (NSMutableIndexSet *)allIndexesInChanges:(NSArray *)changes;
@end
@interface _ASHierarchyItemChange ()
@@ -40,26 +43,12 @@
@end
@implementation _ASHierarchyChangeSet {
NSMutableIndexSet *_deletedSections;
NSMutableIndexSet *_insertedSections;
NSMutableIndexSet *_reloadedSections;
NSMutableArray *_insertedItems;
NSMutableArray *_deletedItems;
NSMutableArray *_reloadedItems;
}
@implementation _ASHierarchyChangeSet
- (instancetype)init
{
self = [super init];
if (self) {
_deletedSections = [NSMutableIndexSet new];
_insertedSections = [NSMutableIndexSet new];
_reloadedSections = [NSMutableIndexSet new];
_deletedItems = [NSMutableArray new];
_insertedItems = [NSMutableArray new];
_reloadedItems = [NSMutableArray new];
_insertItemChanges = [NSMutableArray new];
_deleteItemChanges = [NSMutableArray new];
@@ -172,9 +161,16 @@
[_ASHierarchySectionChange sortAndCoalesceChanges:_deleteSectionChanges];
[_ASHierarchySectionChange sortAndCoalesceChanges:_insertSectionChanges];
[_ASHierarchySectionChange sortAndCoalesceChanges:_reloadSectionChanges];
[_ASHierarchyItemChange sortAndCoalesceChanges:_deleteItemChanges ignoringChangesInSections:_deletedSections];
[_ASHierarchyItemChange sortAndCoalesceChanges:_reloadItemChanges ignoringChangesInSections:_reloadedSections];
[_ASHierarchyItemChange sortAndCoalesceChanges:_insertItemChanges ignoringChangesInSections:_insertedSections];
// Item deletes in deleted sections need not be reported.
NSIndexSet *deletedSections = [_ASHierarchySectionChange allIndexesInChanges:_deleteSectionChanges];
[_ASHierarchyItemChange sortAndCoalesceChanges:_deleteItemChanges ignoringChangesInSections:deletedSections];
// Item reloads/inserts in reloaded/inserted sections need not be reported.
NSMutableIndexSet *reloadedAndInsertedSections = [_ASHierarchySectionChange allIndexesInChanges:_reloadSectionChanges];
[reloadedAndInsertedSections addIndexes:[_ASHierarchySectionChange allIndexesInChanges:_insertSectionChanges]];
[_ASHierarchyItemChange sortAndCoalesceChanges:_reloadItemChanges ignoringChangesInSections:reloadedAndInsertedSections];
[_ASHierarchyItemChange sortAndCoalesceChanges:_insertItemChanges ignoringChangesInSections:reloadedAndInsertedSections];
}
}
@@ -249,6 +245,15 @@
[changes setArray:result];
}
+ (NSMutableIndexSet *)allIndexesInChanges:(NSArray *)changes
{
NSMutableIndexSet *indexes = [NSMutableIndexSet indexSet];
for (_ASHierarchySectionChange *change in changes) {
[indexes addIndexes:change.indexSet];
}
return indexes;
}
@end
@implementation _ASHierarchyItemChange