/*

File: Stack.h

Abstract: A holder for multiple Bits that lines them up in stacks or rows.

Version: 1.0

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*/

#import "Bit.h"

#import "BitHolder.h"

/** A holder for multiple Bits that lines them up in stacks or rows.

    For example, this is used in solitaire card games for each pile in the "tableau". */

@interface Stack : BitHolder

{

    CGPoint _startPos;                      // see properties below for descriptions

    CGSize _spacing;       

    CGSize _wrapSpacing;   

    int _wrapInterval;     

    NSMutableArray *_bits; 

    BOOL _dragAsStacks;    

}

- (id) initWithStartPos: (CGPoint)startPos spacing: (CGSize)spacing;

- (id) initWithStartPos: (CGPoint)startPos spacing: (CGSize)spacing

           wrapInterval: (int)wrapInterval wrapSpacing: (CGSize)wrapSpacing;

@property CGPoint startPos;                 // Position where first Bit should go

@property CGSize spacing;                   // Spacing between successive Bits

@property CGSize wrapSpacing;               // Spacing between wrapped-around sub-piles

@property int wrapInterval;                 // How many Bits to add before wrapping

@property BOOL dragAsStacks;                // If set to YES, dragging a Bit drags a DraggedStack

@property (readonly) NSArray *bits;         // The Bits, in order

@property (readonly) Bit *topBit;           // The topmost Bit (last item in self.bits)

/** Adds a Bit to the end */

- (void) addBit: (Bit*)bit;

@end

/** A subset of a Stack, dragged out of it if its dragAsStacks flag is set.

    This is used in typical card solitaire games.

    A DraggedStack exists only during a drag; afterwards, its Cards

    are incorporated into the destination Stack. */

@interface DraggedStack : Bit

- (id) initWithBits: (NSArray*)bits;

@property (readonly) NSArray *bits;

@end