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libs-gui/Headers/AppKit/NSCollectionView.h
Gregory John Casamento ec6a845cb1 Suggestions by @fredkiefer, correct spacing and fix comment
2023-02-04 09:39:48 -05:00

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/* -*-objc-*-
NSCollectionView.h
Copyright (C) 2013,2021 Free Software Foundation, Inc.
Author: Doug Simons (doug.simons@testplant.com)
Frank LeGrand (frank.legrand@testplant.com)
Gregory Casamento (greg.casamento@gmail.com)
(Adding new delegate methods and support for layouts)
Date: February 2013, December 2021
This file is part of the GNUstep GUI Library.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; see the file COPYING.LIB.
If not, see <http://www.gnu.org/licenses/> or write to the
Free Software Foundation, 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#ifndef _GNUstep_H_NSCollectionView
#define _GNUstep_H_NSCollectionView
#import <AppKit/AppKitDefines.h>
#import <AppKit/NSDragging.h>
#import <AppKit/NSNibDeclarations.h>
#import <AppKit/NSView.h>
#import <AppKit/NSUserInterfaceItemIdentification.h>
@class NSCollectionViewItem;
@class NSCollectionView;
@class NSCollectionViewLayout;
@class NSCollectionViewLayoutAttributes;
@class NSCollectionViewTransitionLayout;
@class NSPasteboard;
@class NSNib;
@class NSMapTable;
@class NSMutableDictionary;
@class NSMutableSet;
@protocol NSPasteboardWriting;
enum
{
NSCollectionViewDropOn = 0,
NSCollectionViewDropBefore = 1,
};
typedef NSInteger NSCollectionViewDropOperation;
#if OS_API_VERSION(MAC_OS_X_VERSION_10_11, GS_API_LATEST)
enum {
NSCollectionViewItemHighlightNone = 0,
NSCollectionViewItemHighlightForSelection = 1,
NSCollectionViewItemHighlightForDeselection = 2,
NSCollectionViewItemHighlightAsDropTarget = 3,
};
typedef NSInteger NSCollectionViewItemHighlightState;
enum {
NSCollectionViewScrollPositionNone = 0,
/*
* Vertical positions are mutually exclusive to each other, but are bitwise or-able with
* the horizontal scroll positions. Combining positions from the same grouping
* (horizontal or vertical) will result in an NSInvalidArgumentException.
*/
NSCollectionViewScrollPositionTop = 1 << 0,
NSCollectionViewScrollPositionCenteredVertically = 1 << 1,
NSCollectionViewScrollPositionBottom = 1 << 2,
NSCollectionViewScrollPositionNearestHorizontalEdge = 1 << 9, /* Nearer of Top,Bottom */
/*
* Likewise, the horizontal positions are mutually exclusive to each other.
*/
NSCollectionViewScrollPositionLeft = 1 << 3,
NSCollectionViewScrollPositionCenteredHorizontally = 1 << 4,
NSCollectionViewScrollPositionRight = 1 << 5,
NSCollectionViewScrollPositionLeadingEdge = 1 << 6, /* Left if LTR, Right if RTL */
NSCollectionViewScrollPositionTrailingEdge = 1 << 7, /* Right if LTR, Left, if RTL */
NSCollectionViewScrollPositionNearestVerticalEdge = 1 << 8, /* Nearer of Leading,Trailing */
};
typedef NSUInteger NSCollectionViewScrollPosition;
#endif
typedef NSString *NSCollectionViewSupplementaryElementKind;
typedef NSString *NSUserInterfaceItemIdentifier;
#if OS_API_VERSION(MAC_OS_X_VERSION_10_11, GS_API_LATEST)
@protocol NSCollectionViewElement <NSObject, NSUserInterfaceItemIdentification>
#if GS_PROTOCOLS_HAVE_OPTIONAL
@optional
#endif
- (void) prepareForReuse;
- (void) applyLayoutAttributes: (NSCollectionViewLayoutAttributes *)layoutAttributes;
- (void) willTransitionFromLayout: (NSCollectionViewLayout *)oldLayout toLayout: (NSCollectionViewLayout *)newLayout;
- (void) didTransitionFromLayout: (NSCollectionViewLayout *)oldLayout toLayout: (NSCollectionViewLayout *)newLayout;
- (NSCollectionViewLayoutAttributes *) preferredLayoutAttributesFittingAttributes: (NSCollectionViewLayoutAttributes *)layoutAttributes;
@end
#endif
#if OS_API_VERSION(MAC_OS_X_VERSION_10_11, GS_API_LATEST)
@protocol NSCollectionViewDataSource <NSObject>
#if GS_PROTOCOLS_HAVE_OPTIONAL
@required
#endif
- (NSInteger) collectionView: (NSCollectionView *)collectionView
numberOfItemsInSection: (NSInteger)section;
- (NSCollectionViewItem *) collectionView: (NSCollectionView *)collectionView
itemForRepresentedObjectAtIndexPath: (NSIndexPath *)indexPath;
#if GS_PROTOCOLS_HAVE_OPTIONAL
@optional
#endif
- (NSInteger) numberOfSectionsInCollectionView: (NSCollectionView *)collectionView;
- (NSView *) collectionView: (NSCollectionView *)collectionView
viewForSupplementaryElementOfKind: (NSCollectionViewSupplementaryElementKind)kind
atIndexPath: (NSIndexPath *)indexPath;
@end
#endif
#if OS_API_VERSION(MAC_OS_X_VERSION_10_11, GS_API_LATEST)
@protocol NSCollectionViewPrefetching <NSObject>
#if GS_PROTOCOLS_HAVE_OPTIONAL
@required
#endif
/**
* Load the items listed in indexPaths in collectionView before they are displayed
*/
- (void)collectionView: (NSCollectionView *)collectionView prefetchItemsAtIndexPaths: (NSArray *)indexPaths;
#if GS_PROTOCOLS_HAVE_OPTIONAL
@optional
#endif
/**
* Cancel the prefetch request for the listed indexPaths.
*/
- (void)collectionView: (NSCollectionView *)collectionView cancelPrefetchingForItemsAtIndexPaths: (NSArray *)indexPaths;
@end
#endif
@protocol NSCollectionViewDelegate <NSObject>
#if GS_PROTOCOLS_HAVE_OPTIONAL
@optional
#endif
#if OS_API_VERSION(MAC_OS_X_VERSION_10_11, GS_API_LATEST)
/**
* Return a boolean indicating if the indexPaths on collectionView can be dragged with the passed in event.
*/
- (BOOL) collectionView: (NSCollectionView *)collectionView
canDragItemsAtIndexPaths: (NSSet *)indexPaths
withEvent: (NSEvent *)event;
#endif
#if OS_API_VERSION(MAC_OS_X_VERSION_10_6, GS_API_LATEST)
/**
* Return a boolean indicating if the indexes on collectionView can be dragged with the passed in event.
*/
- (BOOL) collectionView: (NSCollectionView *)collectionView
canDragItemsAtIndexes: (NSIndexSet *)indexes
withEvent: (NSEvent *)event;
#endif
#if OS_API_VERSION(MAC_OS_X_VERSION_10_11, GS_API_LATEST)
/**
* Return a boolean if the items at indexPaths can be written to the pasteboard
*/
- (BOOL) collectionView: (NSCollectionView *)collectionView
writeItemsAtIndexPaths: (NSSet *)indexPaths
toPasteboard: (NSPasteboard *)pasteboard;
#endif
#if OS_API_VERSION(MAC_OS_X_VERSION_10_6, GS_API_LATEST)
/**
* Return a boolean if the items at indexes can be written to the pasteboard
*/
- (BOOL) collectionView: (NSCollectionView *)collectionView
writeItemsAtIndexes: (NSIndexSet *)indexes
toPasteboard: (NSPasteboard *)pasteboard;
#endif
#if OS_API_VERSION(MAC_OS_X_VERSION_10_11, GS_API_LATEST)
/**
* Returns an array of filenames for files at indexPaths that will be dropped at the destination specified by NSURL.
*/
- (NSArray *) collectionView: (NSCollectionView *)collectionView
namesOfPromisedFilesDroppedAtDestination: (NSURL *)dropURL
forDraggedItemsAtIndexPaths: (NSSet *)indexPaths;
#endif
#if OS_API_VERSION(MAC_OS_X_VERSION_10_6, GS_API_LATEST)
/**
* Returns an array of filenames for files at indexes that will be dropped at the destination specified by NSURL.
*/
- (NSArray *) collectionView: (NSCollectionView *)collectionView
namesOfPromisedFilesDroppedAtDestination: (NSURL *)dropURL
forDraggedItemsAtIndexes: (NSIndexSet *)indexes;
#endif
#if OS_API_VERSION(MAC_OS_X_VERSION_10_11, GS_API_LATEST)
/**
* Returns an NSImage representing the items at indexPaths which are being dragged.
*/
- (NSImage *) collectionView: (NSCollectionView *)collectionView
draggingImageForItemsAtIndexPaths: (NSSet *)indexPaths
withEvent: (NSEvent *)event
offset: (NSPointPointer)dragImageOffset;
#endif
#if OS_API_VERSION(MAC_OS_X_VERSION_10_6, GS_API_LATEST)
/**
* Returns an NSImage representing the items at indexes which are being dragged.
*/
- (NSImage *) collectionView: (NSCollectionView *)collectionView
draggingImageForItemsAtIndexes: (NSIndexSet *)indexes
withEvent: (NSEvent *)event
offset: (NSPointPointer)dragImageOffset;
#endif
#if OS_API_VERSION(MAC_OS_X_VERSION_10_11, GS_API_LATEST)
/**
* Return NSDragOperation when performing drag and drop on collectionView at proposedDropIndexPath.
*/
- (NSDragOperation) collectionView: (NSCollectionView *)collectionView
validateDrop: (id < NSDraggingInfo >)draggingInfo
proposedIndexPath: (NSIndexPath **)proposedDropIndexPath
dropOperation: (NSCollectionViewDropOperation *)proposedDropOperation;
#endif
#if OS_API_VERSION(MAC_OS_X_VERSION_10_6, GS_API_LATEST)
/**
* Return NSDragOperation when performing drag and drop on collectionView at proposedIndex.
*/
- (NSDragOperation) collectionView: (NSCollectionView *)collectionView
validateDrop: (id < NSDraggingInfo >)draggingInfo
proposedIndex: (NSInteger *)proposedDropIndex
dropOperation: (NSCollectionViewDropOperation *)proposedDropOperation;
#endif
#if OS_API_VERSION(MAC_OS_X_VERSION_10_11, GS_API_LATEST)
/**
* Returns a BOOL to indicate if the drop at indexPath was accepted
*/
- (BOOL) collectionView: (NSCollectionView *)collectionView
acceptDrop: (id < NSDraggingInfo >)draggingInfo
indexPath: (NSIndexPath *)indexPath
dropOperation: (NSCollectionViewDropOperation)dropOperation;
#endif
#if OS_API_VERSION(MAC_OS_X_VERSION_10_6, GS_API_LATEST)
/**
* Returns a BOOL to indicate if the drop at index was accepted
*/
- (BOOL) collectionView: (NSCollectionView *)collectionView
acceptDrop: (id < NSDraggingInfo >)draggingInfo
index: (NSInteger)index
dropOperation: (NSCollectionViewDropOperation)dropOperation;
#endif
/* Multi-image drag and drop */
#if OS_API_VERSION(MAC_OS_X_VERSION_10_11, GS_API_LATEST)
/**
* Return NSPasteboardWriting object for collectionView at indexPath
*/
- (id <NSPasteboardWriting>) collectionView: (NSCollectionView *)collectionView
pasteboardWriterForItemAtIndexPath: (NSIndexPath *)indexPath;
#endif
/**
* Return NSPasteboardWriting object for collectionView at index
*/
- (id <NSPasteboardWriting>) collectionView: (NSCollectionView *)collectionView
pasteboardWriterForItemAtIndex: (NSUInteger)index;
#if OS_API_VERSION(MAC_OS_X_VERSION_10_11, GS_API_LATEST)
/**
* Allows application to specify the screenPoint at which a dragging session will begin
* for the given indexPaths
*/
- (void) collectionView: (NSCollectionView *)collectionView
draggingSession: (NSDraggingSession *)session
willBeginAtPoint: (NSPoint)screenPoint
forItemsAtIndexPaths: (NSSet *)indexPaths;
#endif
/**
* Allows application to specify the screenPoint at which a dragging session will begin
* for the given indexes
*/
- (void) collectionView: (NSCollectionView *)collectionView
draggingSession: (NSDraggingSession *)session
willBeginAtPoint: (NSPoint)screenPoint
forItemsAtIndexes: (NSIndexSet *)indexes;
/**
* Allows application to specify the screenPoint at which a dragging session did end
*/
- (void) collectionView: (NSCollectionView *)collectionView
draggingSession: (NSDraggingSession *)session
endedAtPoint: (NSPoint)screenPoint
dragOperation: (NSDragOperation)operation;
/**
* Update items include in the drag operation for collectionView.
*/
- (void) collectionView: (NSCollectionView *)collectionView
updateDraggingItemsForDrag: (id <NSDraggingInfo>)draggingInfo;
/* Selection and Highlighting */
#if OS_API_VERSION(MAC_OS_X_VERSION_10_11, GS_API_LATEST)
/**
* Returns the set of indexPaths that should change their selection. This is sent to inform the delegate of
* those items that the collectionView would like to change to highlightState.
*/
- (NSSet *) collectionView: (NSCollectionView *)collectionView
shouldChangeItemsAtIndexPaths: (NSSet *)indexPaths
toHighlightState: (NSCollectionViewItemHighlightState)highlightState;
/**
* This is sent to inform the delegate of those items that did change highlightState.
*/
- (void) collectionView: (NSCollectionView *)collectionView
didChangeItemsAtIndexPaths: (NSSet *)indexPaths
toHighlightState: (NSCollectionViewItemHighlightState)highlightState;
/**
* Returns the set of indexPaths that should change.
*/
- (NSSet *) collectionView: (NSCollectionView *)collectionView
shouldSelectItemsAtIndexPaths: (NSSet *)indexPaths;
/**
* Returns the set of NSIndexPath objects that should be deselected given the proposed indexPaths.
*/
- (NSSet *) collectionView: (NSCollectionView *)collectionView shouldDeselectItemsAtIndexPaths: (NSSet *)indexPaths;
/**
* Called to inform the delegate of those items that were selected.
*/
- (void) collectionView: (NSCollectionView *)collectionView didSelectItemsAtIndexPaths: (NSSet *)indexPaths;
/**
* Called to inform the delegate of those items that were deselected.
*/
- (void) collectionView: (NSCollectionView *)collectionView didDeselectItemsAtIndexPaths: (NSSet *)indexPaths;
/* Display Notification */
/**
* Called to inform the delegate that the item representing the object at indexPath will be displayed.
*/
- (void) collectionView: (NSCollectionView *)collectionView
willDisplayItem: (NSCollectionViewItem *)item
forRepresentedObjectAtIndexPath: (NSIndexPath *)indexPath;
/**
* Called to inform the delegate that the supplementary view for the elementKind will be displayed
* at indexPath.
*/
- (void) collectionView: (NSCollectionView *)collectionView
willDisplaySupplementaryView: (NSView *)view
forElementKind: (NSCollectionViewSupplementaryElementKind)elementKind
atIndexPath: (NSIndexPath *)indexPath;
/**
* Called to inform the delegate that the collectionView will end display of item for the object at indexPath.
*/
- (void) collectionView: (NSCollectionView *)collectionView
didEndDisplayingItem: (NSCollectionViewItem *)item
forRepresentedObjectAtIndexPath: (NSIndexPath *)indexPath;
/**
* Called to inform the delegate that the collectionView will end display of supplementaryView for the
* object at indexPath.
*/
- (void) collectionView: (NSCollectionView *)collectionView
didEndDisplayingSupplementaryView: (NSView *)view
forElementOfKind: (NSCollectionViewSupplementaryElementKind)elementKind
atIndexPath: (NSIndexPath *)indexPath;
/* Layout Transition Support */
/**
* Called to inform the delegate that the collectionView is transitioning from the old to the new
* layout indicated.
*/
- (NSCollectionViewTransitionLayout *) collectionView: (NSCollectionView *)collectionView
transitionLayoutForOldLayout: (NSCollectionViewLayout *)fromLayout
newLayout: (NSCollectionViewLayout *)toLayout;
#endif
@end
APPKIT_EXPORT_CLASS
@interface NSCollectionView : NSView //<NSDraggingDestination, NSDraggingSource>
{
// Content
NSArray *_content;
NSMutableArray *_items;
NSIndexSet *_selectionIndexes;
NSSet *_selectionIndexPaths;
NSArray *_backgroundColors;
// Delegate and datasource
IBOutlet NSCollectionViewItem *itemPrototype;
IBOutlet id <NSCollectionViewDelegate> _delegate;
IBOutlet id <NSCollectionViewDataSource> _dataSource;
IBOutlet NSView *_backgroundView;
IBOutlet id <NSCollectionViewPrefetching> _prefetchDataSource;
// Layout
NSCollectionViewLayout *_collectionViewLayout;
// Managing items
NSMutableArray *_visibleItems;
NSMutableDictionary *_visibleSupplementaryViews;
NSMutableSet *_indexPathsForSupplementaryElementsOfKind;
// Private
// Map items -> indexPath
NSMapTable *_itemsToIndexPaths;
NSMapTable *_indexPathsToItems;
NSMapTable *_itemsToAttributes;
// Registered class/nib for item identifier
NSMapTable *_registeredNibs;
NSMapTable *_registeredClasses;
// Selection management...
BOOL _allowsMultipleSelection;
BOOL _isSelectable;
BOOL _allowsEmptySelection;
BOOL _backgroundViewScrollsWithContent;
BOOL _allowReload;
// Size
NSSize _itemSize;
NSSize _maxItemSize;
NSSize _minItemSize;
CGFloat _tileWidth;
CGFloat _verticalMargin;
CGFloat _horizontalMargin;
NSUInteger _maxNumberOfColumns;
NSUInteger _maxNumberOfRows;
NSUInteger _numberOfColumns;
// Drag & Drop
NSDragOperation _draggingSourceOperationMaskForLocal;
NSDragOperation _draggingSourceOperationMaskForRemote;
NSUInteger _draggingOnRow;
NSUInteger _draggingOnIndex;
}
- (BOOL) allowsMultipleSelection;
- (void) setAllowsMultipleSelection: (BOOL)flag;
- (NSArray *) backgroundColors;
- (void) setBackgroundColors: (NSArray *)colors;
- (NSArray *) content;
- (void) setContent: (NSArray *)content;
- (id < NSCollectionViewDelegate >) delegate;
- (void) setDelegate: (id < NSCollectionViewDelegate >)aDelegate;
- (NSCollectionViewItem *) itemPrototype;
- (void) setItemPrototype: (NSCollectionViewItem *)prototype;
- (NSSize) maxItemSize;
- (void) setMaxItemSize: (NSSize)size;
- (NSUInteger) maxNumberOfColumns;
- (void) setMaxNumberOfColumns: (NSUInteger)number;
- (NSUInteger) maxNumberOfRows;
- (void) setMaxNumberOfRows: (NSUInteger)number;
- (NSSize) minItemSize;
- (void) setMinItemSize: (NSSize)size;
- (BOOL) isSelectable;
- (void) setSelectable: (BOOL)flag;
- (NSIndexSet *) selectionIndexes;
- (void) setSelectionIndexes: (NSIndexSet *)indexes;
#if OS_API_VERSION(MAC_OS_X_VERSION_10_11, GS_API_LATEST)
- (NSSet *) selectionIndexPaths;
- (void) setSelectionIndexPaths: (NSSet *)indexPaths;
- (NSCollectionViewLayout *) collectionViewLayout;
- (void) setCollectionViewLayout: (NSCollectionViewLayout *)layout;
#endif
- (NSRect) frameForItemAtIndex: (NSUInteger)index;
- (NSCollectionViewItem *) itemAtIndex: (NSUInteger)index;
- (NSCollectionViewItem *) newItemForRepresentedObject: (id)object;
- (void) tile;
- (void) setDraggingSourceOperationMask: (NSDragOperation)dragOperationMask
forLocal: (BOOL)localDestination;
- (NSImage *) draggingImageForItemsAtIndexes: (NSIndexSet *)indexes
withEvent: (NSEvent *)event
offset: (NSPointPointer)dragImageOffset;
#if OS_API_VERSION(MAC_OS_X_VERSION_10_11, GS_API_LATEST)
/* Locating Items and Views */
- (NSArray *) visibleItems;
- (NSSet *) indexPathsForVisibleItems;
- (NSArray *) visibleSupplementaryViewsOfKind: (NSCollectionViewSupplementaryElementKind)elementKind;
- (NSSet *) indexPathsForVisibleSupplementaryElementsOfKind: (NSCollectionViewSupplementaryElementKind)elementKind;
- (NSIndexPath *) indexPathForItem: (NSCollectionViewItem *)item;
- (NSIndexPath *) indexPathForItemAtPoint: (NSPoint)point;
- (NSCollectionViewItem *) itemAtIndexPath: (NSIndexPath *)indexPath;
- (NSView *)supplementaryViewForElementKind: (NSCollectionViewSupplementaryElementKind)elementKind
atIndexPath: (NSIndexPath *)indexPath;
- (void) scrollToItemsAtIndexPaths: (NSSet *)indexPaths
scrollPosition: (NSCollectionViewScrollPosition)scrollPosition;
/* Creating Collection view Items */
- (NSCollectionViewItem *) makeItemWithIdentifier: (NSUserInterfaceItemIdentifier)identifier
forIndexPath: (NSIndexPath *)indexPath;
- (void) registerClass: (Class)itemClass
forItemWithIdentifier: (NSUserInterfaceItemIdentifier)identifier;
- (void) registerNib: (NSNib *)nib
forItemWithIdentifier: (NSUserInterfaceItemIdentifier)identifier;
- (NSView *) makeSupplementaryViewOfKind: (NSCollectionViewSupplementaryElementKind)elementKind
withIdentifier: (NSUserInterfaceItemIdentifier)identifier
forIndexPath: (NSIndexPath *)indexPath;
- (void)registerClass: (Class)viewClass
forSupplementaryViewOfKind: (NSCollectionViewSupplementaryElementKind)kind
withIdentifier: (NSUserInterfaceItemIdentifier)identifier;
- (void) registerNib: (NSNib *)nib
forSupplementaryViewOfKind: (NSCollectionViewSupplementaryElementKind)kind
withIdentifier: (NSUserInterfaceItemIdentifier)identifier;
/* Providing the collection view's data */
- (id<NSCollectionViewDataSource>) dataSource;
- (void) setDataSource: (id<NSCollectionViewDataSource>)dataSource;
/* Configuring the Collection view */
- (NSView *) backgroundView;
- (void) setBackgroundView: (NSView *)backgroundView;
- (BOOL) backgroundViewScrollsWithContent;
- (void) setBackgroundViewScrollsWithContent: (BOOL)f;
/* Reloading Content */
- (void) reloadData;
- (void) reloadSections: (NSIndexSet *)sections;
- (void) reloadItemsAtIndexPaths: (NSSet *)indexPaths;
/* Prefetching Collection View Cells and Data */
- (id<NSCollectionViewPrefetching>) prefetchDataSource;
- (void) setPrefetchDataSource: (id<NSCollectionViewPrefetching>)prefetchDataSource;
/* Getting the State of the Collection View */
- (NSInteger) numberOfSections;
- (NSInteger) numberOfItemsInSection: (NSInteger)section;
/* Inserting, Moving and Deleting Items */
- (void) insertItemsAtIndexPaths: (NSSet *)indexPaths;
- (void) moveItemAtIndexPath: (NSIndexPath *)indexPath
toIndexPath: (NSIndexPath *)newIndexPath;
- (void) deleteItemsAtIndexPaths: (NSSet *)indexPaths;
/* Inserting, Moving, Deleting and Collapsing Sections */
- (void) insertSections: (NSIndexSet *)sections;
- (void) moveSection: (NSInteger)section
toSection: (NSInteger)newSection;
- (void) deleteSections: (NSIndexSet *)sections;
#endif
#if OS_API_VERSION(MAC_OS_X_VERSION_10_12, GS_API_LATEST)
- (IBAction) toggleSectionCollapse: (id)sender;
#endif
#if OS_API_VERSION(MAC_OS_X_VERSION_10_11, GS_API_LATEST)
- (BOOL) allowsEmptySelection;
- (void) setAllowsEmptySelection: (BOOL)flag;
- (NSSet *) selectionIndexPaths; // copy
- (IBAction) selectAll: (id)sender;
- (IBAction) deselectAll: (id)sender;
- (void) selectItemsAtIndexPaths: (NSSet *)indexPaths
scrollPosition: (NSCollectionViewScrollPosition)scrollPosition;
- (void) deselectItemsAtIndexPaths: (NSSet *)indexPaths;
/* Getting Layout Information */
- (NSCollectionViewLayoutAttributes *) layoutAttributesForItemAtIndexPath: (NSIndexPath *)indexPath;
- (NSCollectionViewLayoutAttributes *) layoutAttributesForSupplementaryElementOfKind: (NSCollectionViewSupplementaryElementKind)kind
atIndexPath: (NSIndexPath *)indexPath;
/* Animating Multiple Changes */
DEFINE_BLOCK_TYPE_NO_ARGS(GSCollectionViewPerformBatchUpdatesBlock, void);
DEFINE_BLOCK_TYPE(GSCollectionViewCompletionHandlerBlock, void, BOOL);
- (void) performBatchUpdates: (GSCollectionViewPerformBatchUpdatesBlock) updates
completionHandler: (GSCollectionViewCompletionHandlerBlock) completionHandler;
#endif
@end
#endif /* _GNUstep_H_NSCollectionView */
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