// calculate 
1 # coding = gbk
2 import sys
3 from PyQt4 import QtCore,QtGui
4
5 class Button(QtGui.QToolButton):
6 def __init__(self,text,parent=None):
7 super(Button,self).__init__(parent)
8 self.setSizePolicy(QtGui.QSizePolicy.Expanding,QtGui.QSizePolicy.Preferred)
9 self.setText(text)
10
11 class Calculate(QtGui.QWidget):
12 number_digit_buttons = 10
13 def __init__(self,parent=None):
14 super(Calculate,self).__init__(parent)
15 self.setWindowTitle('calculate')
16
17 self.x = ''
18 self.y = ''
19 self.sum_sofar = 0.0
20 self.factor_sofar = 0.0
21 self.wait_for_operator = True
22
23 self.line_edit = QtGui.QLineEdit('0')
24 self.line_edit.setAlignment(QtCore.Qt.AlignRight)
25 self.line_edit.setReadOnly(True)
26 self.line_edit.setMaxLength(12)
27
28 self.group_box = QtGui.QGroupBox()
29 self.group_box.setTitle('operation')
30
31 self.digit_buttons = []
32 for i in range(Calculate.number_digit_buttons):
33 self.digit_buttons.append(self.create_button(str(i),self.digit_clicked))
34
35 self.point_button = self.create_button('.',self.point_clicked)
36 self.add_button = self.create_button('+',self.additive)
37 self.cut_button = self.create_button('-',self.additive)
38 self.times_button = self.create_button('*',self.multiple)
39 self.division_button = self.create_button('/',self.multiple)
40 self.equal_button = self.create_button('=',self.equal_clicked)
41 self.backspace_button = self.create_button('<--backspace',self.backspace_clicked)
42 #self.button = self.create_button('5',self.digit_clicked)
43 self.clear_button = self.create_button('clear',self.clear)
44
45 self.layout_x = QtGui.QGridLayout()
46 self.layout_x.setSizeConstraint(QtGui.QLayout.SetFixedSize)
47
48
49 for i in range(1,Calculate.number_digit_buttons):
50 row = ((9-i)/3)+1
51 column = ((i-1)%3)
52 self.layout_x.addWidget(self.digit_buttons[i],row,column)
53 self.layout_x.addWidget(self.point_button,3,3)
54 self.layout_x.addWidget(self.digit_buttons[0],4,0)
55 self.layout_x.addWidget(self.add_button,4,1)
56 self.layout_x.addWidget(self.cut_button,4,2)
57 self.layout_x.addWidget(self.times_button,2,3)
58 self.layout_x.addWidget(self.division_button,1,3)
59 self.layout_x.addWidget(self.equal_button,4,3)
60 self.layout_x.addWidget(self.backspace_button,0,0,1,4)
61 self.layout_x.addWidget(self.clear_button,0,4)
62
63 self.group_box.setLayout(self.layout_x)
64
65
66 self.layout = QtGui.QVBoxLayout()
67 self.layout.addWidget(self.line_edit)
68 self.layout.addWidget(self.group_box)
69 #self.layout.addWidget(self.button)
70
71 self.setLayout(self.layout)
72 def backspace_clicked(self):
73 if self.wait_for_operator:
74 return
75 string_a = self.line_edit.text()
76 string_b = string_a[1:]
77 if not string_b:
78 string_b = '0'
79 self.wait_for_operator = True
80 self.line_edit.setText(string_b)
81 def multiple(self):
82 pass
83 def digit_clicked(self):
84 clicked_button = self.sender()
85 digit_value = int(clicked_button.text())
86 if self.line_edit.text() == '0' and digit_value == 0.0:
87 return
88 if self.wait_for_operator:
89 self.line_edit.clear()
90 self.wait_for_operator = False
91 self.line_edit.setText(self.line_edit.text()+str(digit_value))
92 def create_button(self,text,function):
93 #button = QtGui.QToolButton()
94 button = Button(text)
95 button.clicked.connect(function)
96 return button
97 def point_clicked(self):
98 if self.wait_for_operator:
99 self.line_edit.setText('0')
100 if '.' not in self.line_edit.text():
101 self.line_edit.setText(self.line_edit.text()+'.')
102 self.wait_for_operator = False
103 def additive(self):
104 clicked_button = self.sender()
105 clicked_operator = clicked_button.text()
106 operator = float(self.line_edit.text())
107
108 ## if self.x:
109 ## if not self.calculate(operator,self.x):
110 ## self.abort_operation()
111 ## return
112 ## self.line_edit.setText(str(self.factor_sofar))
113 ## operator = self.factor_sofar
114 ## self.factor_sofar = 0.0
115 ## self.x = ''
116 if self.y:
117 if not self.calculate(operator,self.y):
118 self.abort_operation()
119 return
120 self.line_edit.setText(str(self.sum_sofar))
121 else:
122 self.sum_sofar = operator
123 self.y = clicked_operator
124 self.wait_for_operator = True
125 def equal_clicked(self):
126 operator = float(self.line_edit.text())
127 if self.y:
128 if not self.calculate(operator,self.y):
129 self.abort_operation()
130 return
131 #self.line_edit.setText(str(self.sum_sofar))
132 self.y = ''
133 else:
134 self.sum_sofar = operator
135 #self.y = clicked_operator
136 self.line_edit.setText(str(self.sum_sofar))
137 self.sum_sofar = 0.0
138 self.wait_for_operator = True
139
140 def calculate(self,number,tem):
141 if tem == '+':
142 self.sum_sofar += number
143 elif tem == '-':
144 self.sum_sofar -= number
145 return True
146 def abort_operation(self):
147 self.clear_all()
148 self.line_edit.setText('####')
149 def clear_all(self):
150 self.sum_sofar = 0.0
151 self.factor_sofar = 0.0
152 self.x = ''
153 self.y = ''
154 self.line_edit.setText('0')
155 self.wait_for_operator = True
156 def clear(self):
157 if self.wait_for_operator:
158 return
159 self.line_edit.setText('0')
160 self.wait_for_operator = True
161
162 if __name__ == '__main__':
163 app = QtGui.QApplication(sys.argv)
164 calculate = Calculate()
165 calculate.show()
166 sys.exit(app.exec_())
// reference example from pyqt_example
posted on
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