jens@0: /*  This code is based on Apple's "GeekGameBoard" sample code, version 1.0.
jens@0:     http://developer.apple.com/samplecode/GeekGameBoard/
jens@0:     Copyright © 2007 Apple Inc. Copyright © 2008 Jens Alfke. All Rights Reserved.
jens@0: 
jens@0:     Redistribution and use in source and binary forms, with or without modification, are permitted
jens@0:     provided that the following conditions are met:
jens@0: 
jens@0:     * Redistributions of source code must retain the above copyright notice, this list of conditions
jens@0:       and the following disclaimer.
jens@0:     * Redistributions in binary form must reproduce the above copyright notice, this list of
jens@0:       conditions and the following disclaimer in the documentation and/or other materials provided
jens@0:       with the distribution.
jens@0: 
jens@0:     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
jens@0:     IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 
jens@0:     FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRI-
jens@0:     BUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
jens@0:     (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
jens@0:     PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
jens@0:     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 
jens@0:     THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
jens@0: */
jens@0: #import "BitHolder.h"
jens@0: #import "Bit.h"
jens@0: #import "QuartzUtils.h"
jens@0: #import "GGBUtils.h"
jens@0: 
jens@0: 
jens@0: @implementation BitHolder
jens@0: 
jens@0: 
jens@0: - (void) dealloc
jens@0: {
jens@0:     [_bit release];
jens@0:     [super dealloc];
jens@0: }
jens@0: 
jens@0: 
jens@0: - (Bit*) bit
jens@0: {
jens@0:     if( _bit && _bit.superlayer != self && !_bit.pickedUp )
jens@0:         setObj(&_bit,nil);
jens@0:     return _bit;
jens@0: }
jens@0: 
jens@0: - (void) setBit: (Bit*)bit
jens@0: {
jens@0:     if( bit != self.bit ) {
jens@7:         if( _bit ) {
jens@7:             if( bit )
jens@7:                 [_bit destroy];
jens@7:             else
jens@7:                 [_bit removeFromSuperlayer];
jens@7:         }
jens@0:         setObj(&_bit,bit);
jens@0:         ChangeSuperlayer(bit,self,-1);
jens@0:     }
jens@0: }
jens@0: 
jens@0: - (BOOL) isEmpty    {return self.bit==nil;}
jens@0: 
jens@0: @synthesize highlighted=_highlighted;
jens@0: 
jens@0: - (Bit*) canDragBit: (Bit*)bit
jens@0: {
jens@0:     if( bit.superlayer == self && ! bit.unfriendly )
jens@0:         return bit;
jens@0:     else
jens@0:         return nil;
jens@0: }
jens@0: 
jens@0: - (void) cancelDragBit: (Bit*)bit                       { }
jens@0: - (void) draggedBit: (Bit*)bit to: (id<BitHolder>)dst   {self.bit = nil;}
jens@0: 
jens@0: - (BOOL) canDropBit: (Bit*)bit atPoint: (CGPoint)point  {return YES;}
jens@0: - (void) willNotDropBit: (Bit*)bit                      { }
jens@0: 
jens@0: - (BOOL) dropBit: (Bit*)bit atPoint: (CGPoint)point
jens@0: {
jens@0:     self.bit = bit;
jens@0:     return YES;
jens@0: }
jens@0: 
jens@0: @end