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50 | |
51 | #ifndef CALCULATOR_H |
52 | #define CALCULATOR_H |
53 | |
54 | #include <QWidget> |
55 | |
56 | QT_BEGIN_NAMESPACE |
57 | class QLineEdit; |
58 | QT_END_NAMESPACE |
59 | class Button; |
60 | |
61 | //! [0] |
62 | class Calculator : public QWidget |
63 | { |
64 | Q_OBJECT |
65 | |
66 | public: |
67 | Calculator(QWidget *parent = nullptr); |
68 | |
69 | private slots: |
70 | void digitClicked(); |
71 | void unaryOperatorClicked(); |
72 | void additiveOperatorClicked(); |
73 | void multiplicativeOperatorClicked(); |
74 | void equalClicked(); |
75 | void pointClicked(); |
76 | void changeSignClicked(); |
77 | void backspaceClicked(); |
78 | void clear(); |
79 | void clearAll(); |
80 | void clearMemory(); |
81 | void readMemory(); |
82 | void setMemory(); |
83 | void addToMemory(); |
84 | //! [0] |
85 | |
86 | //! [1] |
87 | private: |
88 | //! [1] //! [2] |
89 | Button *createButton(const QString &text, const char *member); |
90 | void abortOperation(); |
91 | bool calculate(double rightOperand, const QString &pendingOperator); |
92 | //! [2] |
93 | |
94 | //! [3] |
95 | double sumInMemory; |
96 | //! [3] //! [4] |
97 | double sumSoFar; |
98 | //! [4] //! [5] |
99 | double factorSoFar; |
100 | //! [5] //! [6] |
101 | QString pendingAdditiveOperator; |
102 | //! [6] //! [7] |
103 | QString pendingMultiplicativeOperator; |
104 | //! [7] //! [8] |
105 | bool waitingForOperand; |
106 | //! [8] |
107 | |
108 | //! [9] |
109 | QLineEdit *display; |
110 | //! [9] //! [10] |
111 | |
112 | enum { NumDigitButtons = 10 }; |
113 | Button *digitButtons[NumDigitButtons]; |
114 | }; |
115 | //! [10] |
116 | |
117 | #endif |
118 | |