diff -r 000000000000 -r 45c82a071aca Source/Stack.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Source/Stack.h	Wed May 28 12:47:10 2008 -0700
@@ -0,0 +1,68 @@
+/*  This code is based on Apple's "GeekGameBoard" sample code, version 1.0.
+    http://developer.apple.com/samplecode/GeekGameBoard/
+    Copyright © 2007 Apple Inc. Copyright © 2008 Jens Alfke. All Rights Reserved.
+
+    Redistribution and use in source and binary forms, with or without modification, are permitted
+    provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright notice, this list of conditions
+      and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright notice, this list of
+      conditions and the following disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 
+    FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRI-
+    BUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
+    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
+    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 
+    THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+#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