40 | | 1 | unit Core.Card; |
41 | | 2 | |
42 | | 3 | interface |
43 | | 4 | |
44 | | 5 | type |
45 | | 6 | ICard = interface |
46 | | 7 | ['{1BD19858-F354-498C-AF3D-E363122019A3}'] |
47 | | 8 | function GetFacingUp : boolean; |
48 | | 9 | |
49 | | 10 | function Flip : boolean; |
50 | | 11 | property FacingUp : boolean read GetFacingUp; |
51 | | 12 | end; |
52 | | 13 | |
53 | | 14 | TCard = class(TInterfacedObject, ICard) |
54 | | 15 | private |
55 | | 16 | FFacingUp : boolean; |
56 | | 17 | public |
57 | | 18 | constructor Create; |
58 | | 19 | function GetFacingUp : boolean; |
59 | | 20 | function Flip : boolean; |
60 | | 21 | function TurnFaceDown : boolean; |
61 | | 22 | end; |
62 | | 23 | |
63 | | 24 | implementation |
64 | | 25 | |
65 | | 26 | { TCard } |
66 | | 27 | |
67 | | 28 | constructor TCard.Create; |
68 | | 29 | begin |
69 | | 30 | inherited; |
70 | | 31 | //By default the card is facing up. |
71 | | 32 | FFacingUp := True; |
72 | | 33 | end; |
73 | | 34 | |
74 | | 35 | function TCard.Flip: boolean; |
75 | | 36 | begin |
76 | | 37 | //Change the card from facing the way it is to the facing the other way. |
77 | | 38 | //A card can either be facing up, or down. |
78 | | 39 | FFacingUp := not FFacingUp; |
79 | | 40 | |
80 | | 41 | //Return the current facing up status. |
81 | | 42 | result := FFacingUp; |
82 | | 43 | end; |
83 | | 44 | |
84 | | 45 | function TCard.GetFacingUp: boolean; |
85 | | 46 | begin |
86 | | 47 | //Return whether the card is facing up or not. |
87 | | 48 | result := FFacingUp; |
88 | | 49 | end; |
89 | | 50 | |
90 | | 51 | function TCard.TurnFaceDown: boolean; |
91 | | 52 | begin |
92 | | 53 | //Make the card face down. |
93 | | 54 | FFacingUp := false; |
94 | | 55 | //Return the current facing up status. |
95 | | 56 | result := FFacingUp; |
96 | | 57 | end; |
97 | | 58 | |
98 | | 59 | end. |
99 |
100 |
101 |
102 |
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