|
jens@0
|
1 |
/* This code is based on Apple's "GeekGameBoard" sample code, version 1.0.
|
|
jens@0
|
2 |
http://developer.apple.com/samplecode/GeekGameBoard/
|
|
jens@0
|
3 |
Copyright © 2007 Apple Inc. Copyright © 2008 Jens Alfke. All Rights Reserved.
|
|
jens@0
|
4 |
|
|
jens@0
|
5 |
Redistribution and use in source and binary forms, with or without modification, are permitted
|
|
jens@0
|
6 |
provided that the following conditions are met:
|
|
jens@0
|
7 |
|
|
jens@0
|
8 |
* Redistributions of source code must retain the above copyright notice, this list of conditions
|
|
jens@0
|
9 |
and the following disclaimer.
|
|
jens@0
|
10 |
* Redistributions in binary form must reproduce the above copyright notice, this list of
|
|
jens@0
|
11 |
conditions and the following disclaimer in the documentation and/or other materials provided
|
|
jens@0
|
12 |
with the distribution.
|
|
jens@0
|
13 |
|
|
jens@0
|
14 |
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
|
|
jens@0
|
15 |
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
|
|
jens@0
|
16 |
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRI-
|
|
jens@0
|
17 |
BUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
jens@0
|
18 |
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
|
jens@0
|
19 |
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
jens@0
|
20 |
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
|
|
jens@0
|
21 |
THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
jens@0
|
22 |
*/
|
|
jens@1
|
23 |
#import "GGBLayer.h"
|
|
jens@0
|
24 |
@class Bit;
|
|
jens@0
|
25 |
|
|
jens@0
|
26 |
|
|
jens@0
|
27 |
/** Protocol for a layer that acts as a container for Bits. */
|
|
jens@0
|
28 |
@protocol BitHolder <NSObject>
|
|
jens@0
|
29 |
|
|
jens@0
|
30 |
/** Current Bit, or nil if empty */
|
|
jens@0
|
31 |
@property (retain) Bit* bit;
|
|
jens@0
|
32 |
|
|
jens@10
|
33 |
/** Sets current Bit to nil, triggering its "destroy" animation */
|
|
jens@10
|
34 |
- (void) destroyBit;
|
|
jens@10
|
35 |
|
|
jens@0
|
36 |
/** Conveniences for comparing self.bit with nil */
|
|
jens@0
|
37 |
@property (readonly, getter=isEmpty) BOOL empty;
|
|
jens@0
|
38 |
|
|
jens@0
|
39 |
/** BitHolders will be highlighted while the target of a drag operation */
|
|
jens@0
|
40 |
@property BOOL highlighted;
|
|
jens@0
|
41 |
|
|
jens@0
|
42 |
|
|
jens@0
|
43 |
/** Tests whether the bit is allowed to be dragged out of me.
|
|
jens@0
|
44 |
Returns the input bit, or possibly a different Bit to drag instead, or nil if not allowed.
|
|
jens@0
|
45 |
Either -cancelDragBit: or -draggedBit:to: must be called next. */
|
|
jens@0
|
46 |
- (Bit*) canDragBit: (Bit*)bit;
|
|
jens@0
|
47 |
|
|
jens@0
|
48 |
/** Cancels a pending drag (begun by -canDragBit:). */
|
|
jens@0
|
49 |
- (void) cancelDragBit: (Bit*)bit;
|
|
jens@0
|
50 |
|
|
jens@0
|
51 |
/** Called after a drag finishes. */
|
|
jens@0
|
52 |
- (void) draggedBit: (Bit*)bit to: (id<BitHolder>)dst;
|
|
jens@0
|
53 |
|
|
jens@0
|
54 |
|
|
jens@0
|
55 |
/** Tests whether the bit is allowed to be dropped into me.
|
|
jens@0
|
56 |
Either -willNotDropBit: or -dropBit:atPoint: must be called next. */
|
|
jens@0
|
57 |
- (BOOL) canDropBit: (Bit*)bit atPoint: (CGPoint)point;
|
|
jens@0
|
58 |
|
|
jens@0
|
59 |
/** Cancels a pending drop (after -canDropBit:atPoint: was already called.) */
|
|
jens@0
|
60 |
- (void) willNotDropBit: (Bit*)bit;
|
|
jens@0
|
61 |
|
|
jens@0
|
62 |
/** Finishes a drop. */
|
|
jens@0
|
63 |
- (BOOL) dropBit: (Bit*)bit atPoint: (CGPoint)point;
|
|
jens@0
|
64 |
|
|
jens@0
|
65 |
@end
|
|
jens@0
|
66 |
|
|
jens@0
|
67 |
|
|
jens@0
|
68 |
/** A basic implementation of the BitHolder protocol. */
|
|
jens@1
|
69 |
@interface BitHolder : GGBLayer <BitHolder>
|
|
jens@0
|
70 |
{
|
|
jens@0
|
71 |
@protected
|
|
jens@0
|
72 |
Bit *_bit;
|
|
jens@0
|
73 |
BOOL _highlighted;
|
|
jens@0
|
74 |
}
|
|
jens@0
|
75 |
|
|
jens@0
|
76 |
@end
|