#import <Foundation/Foundation.h>

#import "AQGridViewUpdateItem.h"

#import "AQGridView.h"

@interface AQGridView ()

@property (nonatomic, copy) NSSet * animatingCells;

@interface AQGridViewUpdateInfo : NSObject

{

// NB: These are never cleared, only sorted & modified.

// It is assumed that a deferred update info object will be created in -beginUpdates

// and released in -endUpdates, and will not need to last across multiple suspended update sequences

NSMutableArray * _insertItems;

NSMutableArray * _deleteItems;

NSMutableArray * _moveItems;

NSMutableArray * _reloadItems;

// index sets, cached for handiness

NSMutableIndexSet * _insertedIndices;

NSMutableIndexSet * _deletedIndices;

NSMutableIndexSet * _oldMovedIndices;

NSMutableIndexSet * _newMovedIndices;

NSMutableIndexSet * _reloadedIndices;

// old and new grid data -- for bounds calculations

AQGridViewData * _oldGridData;

AQGridViewData * _newGridData;

// mapping tables, used to map from old indices to new ones

NSUInteger * _oldToNewIndexMap;

NSUInteger * _newToOldIndexMap;

// indices of all items which were simply shuffled around as a result of other operations

NSMutableIndexSet * _onlyMovedIndices;

// needs to ask the grid view for cells

AQGridView * _gridView; // weak reference

NSMutableSet * _animatingCells;

}

- (id) initWithOldGridData: (AQGridViewData *) oldGridData forGridView: (AQGridView *) gridView;

- (void) updateItemsAtIndices: (NSIndexSet *) indices

updateAction: (AQGridViewUpdateAction) action

withAnimation: (AQGridViewItemAnimation) animation;

- (void) moveItemAtIndex: (NSUInteger) index

toIndex: (NSUInteger) index

withAnimation: (AQGridViewItemAnimation) animation;

@property (nonatomic, readonly) NSUInteger numberOfUpdates;

- (void) cleanupUpdateItems;

- (NSArray *) sortedInsertItems;

- (NSArray *) sortedDeleteItems;

- (NSArray *) sortedMoveItems;

- (NSArray *) sortedReloadItems;

- (AQGridViewData *) newGridViewData;

- (NSUInteger) numberOfItemsAfterUpdates;

- (NSUInteger) newIndexForOldIndex: (NSUInteger) oldIndex;

- (NSSet *) animateCellUpdatesUsingVisibleContentRect: (CGRect) contentRect;