/* -*-objc-*-
   NSCollectionView.h

   Copyright (C) 2013 Free Software Foundation, Inc.

   Author: Doug Simons (doug.simons@testplant.com)
           Frank LeGrand (frank.legrand@testplant.com)
   Date: February 2013
   
   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/NSNibDeclarations.h>
#import <GNUstepBase/GSVersionMacros.h>

#import <AppKit/NSView.h>
#import <AppKit/NSDragging.h>

@class NSCollectionViewItem;
@class NSCollectionView;

enum
{  
  NSCollectionViewDropOn = 0,
  NSCollectionViewDropBefore = 1,
};
typedef NSInteger NSCollectionViewDropOperation;

@protocol NSCollectionViewDelegate <NSObject>

- (NSImage *)collectionView:(NSCollectionView *)collectionView draggingImageForItemsAtIndexes:(NSIndexSet *)indexes withEvent:(NSEvent *)event offset:(NSPointPointer)dragImageOffset;
- (BOOL)collectionView:(NSCollectionView *)collectionView writeItemsAtIndexes:(NSIndexSet *)indexes toPasteboard:(NSPasteboard *)pasteboard;
- (BOOL)collectionView:(NSCollectionView *)collectionView canDragItemsAtIndexes:(NSIndexSet *)indexes withEvent:(NSEvent *)event;
- (NSDragOperation)collectionView:(NSCollectionView *)collectionView validateDrop:(id < NSDraggingInfo >)draggingInfo proposedIndex:(NSInteger *)proposedDropIndex dropOperation:(NSCollectionViewDropOperation *)proposedDropOperation;
- (BOOL)collectionView:(NSCollectionView *)collectionView acceptDrop:(id < NSDraggingInfo >)draggingInfo index:(NSInteger)index dropOperation:(NSCollectionViewDropOperation)dropOperation;
- (NSArray *)collectionView:(NSCollectionView *)collectionView namesOfPromisedFilesDroppedAtDestination:(NSURL *)dropURL forDraggedItemsAtIndexes:(NSIndexSet *)indexes;

@end


@interface NSCollectionView : NSView
{
  NSArray *_content;
  IBOutlet NSCollectionViewItem *itemPrototype;
  NSMutableArray *_items;
  
  BOOL _allowsMultipleSelection;
  BOOL _isSelectable;
  NSIndexSet *_selectionIndexes;
  
  NSArray *_backgroundColors;
  IBOutlet id <NSCollectionViewDelegate> delegate;
  
  NSSize _itemSize;
  NSSize _maxItemSize;
  NSSize _minItemSize;
  float _tileWidth;
  float _verticalMargin;
  float _horizontalMargin;

  NSUInteger _maxNumberOfColumns;
  NSUInteger _maxNumberOfRows;
  long _numberOfColumns;
  
  NSDragOperation _draggingSourceOperationMaskForLocal;
  NSDragOperation _draggingSourceOperationMaskForRemote;
  NSEvent *_mouseDownEvent;
}

- (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;

- (BOOL)isFirstResponder;

- (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;

- (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;


@end

#endif /* _GNUstep_H_NSCollectionView */