class Calculator(tk.Frame):
def __init__(self, master=None):
super().__init__(master)
self.master = master
self.pack()
self.controls_layout = list()
self.result_flag = False
self.text_layout = [[], ['AC', '+/-', '%', '/'], ['7', '8', '9', 'X'],
['4', '5', '6', '-'], ['1', '2', '3', '+'],
['0', None, ',', '=']]
self.callbacks_layout = [
[],
[
self._bttn_AC, self._bttn_unary_minus, self._bttn_percent,
self._bttn_divide
],
[self._bttn_7, self._bttn_8, self._bttn_9, self._bttn_multiply],
[self._bttn_4, self._bttn_5, self._bttn_6, self._bttn_minus],
[self._bttn_1, self._bttn_2, self._bttn_3, self._bttn_plus],
[self._bttn_0, None, self._bttn_decimal, self._bttn_equals],
]
self.display_stringvar = tk.StringVar()
self.create_widgets()
self.formula = Formula()
print('init')
def _bttn_AC(self): # AC
self.display_stringvar.set('0')
self.formula.clear()
def _bttn_unary_minus(self): # +/-
value = self.display_stringvar.get()
if value.startswith('-'):
value = value[1:]
else:
value = f"-{value}"
self.display_stringvar.set(value)
def _bttn_percent(self): # %
value = float(self.display_stringvar.get())
self.display_stringvar.set(0.01 * value)
def _bttn_plus(self): # +
self._press_op('+')
def _bttn_minus(self): # -
self._press_op('-')
def _bttn_multiply(self): # *
self._press_op('*')
def _bttn_divide(self): # /
self._press_op('/')
def _bttn_0(self): # 0
self._press_num(0)
def _bttn_1(self): # 1
self._press_num(1)
def _bttn_2(self): # 2
self._press_num(2)
def _bttn_3(self): # 3
self._press_num(3)
def _bttn_4(self): # 4
self._press_num(4)
def _bttn_5(self): # 5
self._press_num(5)
def _bttn_6(self): # 6
self._press_num(6)
def _bttn_7(self): # 7
self._press_num(7)
def _bttn_8(self): # 8
self._press_num(8)
def _bttn_9(self): # 9
self._press_num(9)
def _bttn_decimal(self): # ,
value = self.display_stringvar.get()
if '.' not in value:
value = f'{value}.'
self.display_stringvar.set(value)
def _bttn_equals(self): # =
self._press_op()
def _press_num(self, num):
value = self.display_stringvar.get()
if value == '0' or self.result_flag:
self.display_stringvar.set(num)
self.result_flag = False
else:
self.display_stringvar.set(f"{value}{num}")
def _press_op(self, oper=None):
if self.formula.A and self.formula.B:
self._perform_op(oper)
elif self.formula.A:
self.formula.B = float(self.display_stringvar.get())
self._perform_op(oper)
else:
self.formula.A = float(self.display_stringvar.get())
self.formula.oper = oper
self.display_stringvar.set(0)
print(self.formula)
def _perform_op(self, oper=None):
if oper:
result = self.formula.perform_operation()
print(result)
self.formula.A = result
self.formula.oper = oper
self.formula.B = None
self.display_stringvar.set(result)
self.result_flag = True
print(self.formula)
else:
result = self.formula.perform_operation()
self.display_stringvar.set(result)
self.result_flag = True
self.formula.clear()
print(self.formula)
def create_widgets(self):
layout_list = list()
for row_num in range(6):
inner_list = list()
if row_num == 0:
entry = tk.Entry(self,
textvariable=self.display_stringvar,
justify='right',
width=40,
state='disabled')
inner_list.append(entry)
entry.grid(row=0, column=0, columnspan=4)
else:
for col_num in range(4):
layout_value = self.text_layout[row_num][col_num]
if not layout_value:
continue
button = tk.Button(self,
text=layout_value,
height=3,
width=10,
activebackground='blue')
button['command'] = self.callbacks_layout[row_num][col_num]
inner_list.append(button)
if button['text'] == '0':
button.grid(row=row_num, column=col_num, columnspan=2)
button['width'] = 2 * button['width']
else:
button.grid(row=row_num, column=col_num)
layout_list.append(inner_list)
self.controls_layout = layout_list
